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glib/gio/gsocket.c
Dan Winship 8f80fbb2a7 Remove some unnecessary source prepare/check functions 
GPollableSource and GSocket's "broken" source never trigger on their
own, so with the changes to GSources in the last cycle, their check
and prepare functions are unnecessary (and undesired).

https://bugzilla.gnome.org/show_bug.cgi?id=701511
2013-07-13 16:38:55 -04:00

4517 lines
120 KiB
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/* GIO - GLib Input, Output and Streaming Library
*
* Copyright (C) 2008 Christian Kellner, Samuel Cormier-Iijima
* Copyright © 2009 Codethink Limited
* Copyright © 2009 Red Hat, Inc
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General
* Public License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place, Suite 330,
* Boston, MA 02111-1307, USA.
*
* Authors: Christian Kellner <gicmo@gnome.org>
* Samuel Cormier-Iijima <sciyoshi@gmail.com>
* Ryan Lortie <desrt@desrt.ca>
* Alexander Larsson <alexl@redhat.com>
*/
#include "config.h"
#include "gsocket.h"
#ifdef G_OS_UNIX
#include "glib-unix.h"
#endif
#include <errno.h>
#include <signal.h>
#include <string.h>
#include <stdlib.h>
#ifndef G_OS_WIN32
# include <fcntl.h>
# include <unistd.h>
# include <sys/ioctl.h>
#endif
#ifdef HAVE_SYS_FILIO_H
# include <sys/filio.h>
#endif
#ifdef HAVE_SYS_UIO_H
#include <sys/uio.h>
#endif
#include "gcancellable.h"
#include "gioenumtypes.h"
#include "ginetaddress.h"
#include "ginitable.h"
#include "gioerror.h"
#include "gioenums.h"
#include "gioerror.h"
#include "gnetworkingprivate.h"
#include "gsocketaddress.h"
#include "gsocketcontrolmessage.h"
#include "gcredentials.h"
#include "glibintl.h"
/**
* SECTION:gsocket
* @short_description: Low-level socket object
* @include: gio/gio.h
* @see_also: #GInitable, <link linkend="gio-gnetworking.h">gnetworking.h</link>
*
* A #GSocket is a low-level networking primitive. It is a more or less
* direct mapping of the BSD socket API in a portable GObject based API.
* It supports both the UNIX socket implementations and winsock2 on Windows.
*
* #GSocket is the platform independent base upon which the higher level
* network primitives are based. Applications are not typically meant to
* use it directly, but rather through classes like #GSocketClient,
* #GSocketService and #GSocketConnection. However there may be cases where
* direct use of #GSocket is useful.
*
* #GSocket implements the #GInitable interface, so if it is manually constructed
* by e.g. g_object_new() you must call g_initable_init() and check the
* results before using the object. This is done automatically in
* g_socket_new() and g_socket_new_from_fd(), so these functions can return
* %NULL.
*
* Sockets operate in two general modes, blocking or non-blocking. When
* in blocking mode all operations block until the requested operation
* is finished or there is an error. In non-blocking mode all calls that
* would block return immediately with a %G_IO_ERROR_WOULD_BLOCK error.
* To know when a call would successfully run you can call g_socket_condition_check(),
* or g_socket_condition_wait(). You can also use g_socket_create_source() and
* attach it to a #GMainContext to get callbacks when I/O is possible.
* Note that all sockets are always set to non blocking mode in the system, and
* blocking mode is emulated in GSocket.
*
* When working in non-blocking mode applications should always be able to
* handle getting a %G_IO_ERROR_WOULD_BLOCK error even when some other
* function said that I/O was possible. This can easily happen in case
* of a race condition in the application, but it can also happen for other
* reasons. For instance, on Windows a socket is always seen as writable
* until a write returns %G_IO_ERROR_WOULD_BLOCK.
*
* #GSocket<!-- -->s can be either connection oriented or datagram based.
* For connection oriented types you must first establish a connection by
* either connecting to an address or accepting a connection from another
* address. For connectionless socket types the target/source address is
* specified or received in each I/O operation.
*
* All socket file descriptors are set to be close-on-exec.
*
* Note that creating a #GSocket causes the signal %SIGPIPE to be
* ignored for the remainder of the program. If you are writing a
* command-line utility that uses #GSocket, you may need to take into
* account the fact that your program will not automatically be killed
* if it tries to write to %stdout after it has been closed.
*
* Since: 2.22
*/
static void g_socket_initable_iface_init (GInitableIface *iface);
static gboolean g_socket_initable_init (GInitable *initable,
GCancellable *cancellable,
GError **error);
enum
{
PROP_0,
PROP_FAMILY,
PROP_TYPE,
PROP_PROTOCOL,
PROP_FD,
PROP_BLOCKING,
PROP_LISTEN_BACKLOG,
PROP_KEEPALIVE,
PROP_LOCAL_ADDRESS,
PROP_REMOTE_ADDRESS,
PROP_TIMEOUT,
PROP_TTL,
PROP_BROADCAST,
PROP_MULTICAST_LOOPBACK,
PROP_MULTICAST_TTL
};
/* Size of the receiver cache for g_socket_receive_from() */
#define RECV_ADDR_CACHE_SIZE 8
struct _GSocketPrivate
{
GSocketFamily family;
GSocketType type;
GSocketProtocol protocol;
gint fd;
gint listen_backlog;
guint timeout;
GError *construct_error;
GSocketAddress *remote_address;
guint inited : 1;
guint blocking : 1;
guint keepalive : 1;
guint closed : 1;
guint connected : 1;
guint listening : 1;
guint timed_out : 1;
guint connect_pending : 1;
#ifdef G_OS_WIN32
WSAEVENT event;
int current_events;
int current_errors;
int selected_events;
GList *requested_conditions; /* list of requested GIOCondition * */
#endif
struct {
GSocketAddress *addr;
struct sockaddr *native;
gint native_len;
guint64 last_used;
} recv_addr_cache[RECV_ADDR_CACHE_SIZE];
};
G_DEFINE_TYPE_WITH_CODE (GSocket, g_socket, G_TYPE_OBJECT,
G_ADD_PRIVATE (GSocket)
g_networking_init ();
G_IMPLEMENT_INTERFACE (G_TYPE_INITABLE,
g_socket_initable_iface_init));
static int
get_socket_errno (void)
{
#ifndef G_OS_WIN32
return errno;
#else
return WSAGetLastError ();
#endif
}
static GIOErrorEnum
socket_io_error_from_errno (int err)
{
#ifndef G_OS_WIN32
return g_io_error_from_errno (err);
#else
switch (err)
{
case WSAEADDRINUSE:
return G_IO_ERROR_ADDRESS_IN_USE;
case WSAEWOULDBLOCK:
return G_IO_ERROR_WOULD_BLOCK;
case WSAEACCES:
return G_IO_ERROR_PERMISSION_DENIED;
case WSA_INVALID_HANDLE:
case WSA_INVALID_PARAMETER:
case WSAEBADF:
case WSAENOTSOCK:
return G_IO_ERROR_INVALID_ARGUMENT;
case WSAEPROTONOSUPPORT:
return G_IO_ERROR_NOT_SUPPORTED;
case WSAECANCELLED:
return G_IO_ERROR_CANCELLED;
case WSAESOCKTNOSUPPORT:
case WSAEOPNOTSUPP:
case WSAEPFNOSUPPORT:
case WSAEAFNOSUPPORT:
return G_IO_ERROR_NOT_SUPPORTED;
default:
return G_IO_ERROR_FAILED;
}
#endif
}
static const char *
socket_strerror (int err)
{
#ifndef G_OS_WIN32
return g_strerror (err);
#else
const char *msg_ret;
char *msg;
msg = g_win32_error_message (err);
msg_ret = g_intern_string (msg);
g_free (msg);
return msg_ret;
#endif
}
#ifdef G_OS_WIN32
#define win32_unset_event_mask(_socket, _mask) _win32_unset_event_mask (_socket, _mask)
static void
_win32_unset_event_mask (GSocket *socket, int mask)
{
socket->priv->current_events &= ~mask;
socket->priv->current_errors &= ~mask;
}
#else
#define win32_unset_event_mask(_socket, _mask)
#endif
/* Windows has broken prototypes... */
#ifdef G_OS_WIN32
#define getsockopt(sockfd, level, optname, optval, optlen) \
getsockopt (sockfd, level, optname, (gpointer) optval, (int*) optlen)
#define setsockopt(sockfd, level, optname, optval, optlen) \
setsockopt (sockfd, level, optname, (gpointer) optval, optlen)
#define getsockname(sockfd, addr, addrlen) \
getsockname (sockfd, addr, (int *)addrlen)
#define getpeername(sockfd, addr, addrlen) \
getpeername (sockfd, addr, (int *)addrlen)
#define recv(sockfd, buf, len, flags) \
recv (sockfd, (gpointer)buf, len, flags)
#endif
static void
set_fd_nonblocking (int fd)
{
#ifndef G_OS_WIN32
GError *error = NULL;
#else
gulong arg;
#endif
#ifndef G_OS_WIN32
if (!g_unix_set_fd_nonblocking (fd, TRUE, &error))
{
g_warning ("Error setting socket nonblocking: %s", error->message);
g_clear_error (&error);
}
#else
arg = TRUE;
if (ioctlsocket (fd, FIONBIO, &arg) == SOCKET_ERROR)
{
int errsv = get_socket_errno ();
g_warning ("Error setting socket status flags: %s", socket_strerror (errsv));
}
#endif
}
static gboolean
check_socket (GSocket *socket,
GError **error)
{
if (!socket->priv->inited)
{
g_set_error_literal (error, G_IO_ERROR, G_IO_ERROR_NOT_INITIALIZED,
_("Invalid socket, not initialized"));
return FALSE;
}
if (socket->priv->construct_error)
{
g_set_error (error, G_IO_ERROR, G_IO_ERROR_NOT_INITIALIZED,
_("Invalid socket, initialization failed due to: %s"),
socket->priv->construct_error->message);
return FALSE;
}
if (socket->priv->closed)
{
g_set_error_literal (error, G_IO_ERROR, G_IO_ERROR_CLOSED,
_("Socket is already closed"));
return FALSE;
}
if (socket->priv->timed_out)
{
socket->priv->timed_out = FALSE;
g_set_error_literal (error, G_IO_ERROR, G_IO_ERROR_TIMED_OUT,
_("Socket I/O timed out"));
return FALSE;
}
return TRUE;
}
static void
g_socket_details_from_fd (GSocket *socket)
{
struct sockaddr_storage address;
gint fd;
guint addrlen;
int value, family;
int errsv;
fd = socket->priv->fd;
if (!g_socket_get_option (socket, SOL_SOCKET, SO_TYPE, &value, NULL))
{
errsv = get_socket_errno ();
switch (errsv)
{
#ifdef ENOTSOCK
case ENOTSOCK:
#else
#ifdef WSAENOTSOCK
case WSAENOTSOCK:
#endif
#endif
case EBADF:
/* programmer error */
g_error ("creating GSocket from fd %d: %s\n",
fd, socket_strerror (errsv));
default:
break;
}
goto err;
}
switch (value)
{
case SOCK_STREAM:
socket->priv->type = G_SOCKET_TYPE_STREAM;
break;
case SOCK_DGRAM:
socket->priv->type = G_SOCKET_TYPE_DATAGRAM;
break;
case SOCK_SEQPACKET:
socket->priv->type = G_SOCKET_TYPE_SEQPACKET;
break;
default:
socket->priv->type = G_SOCKET_TYPE_INVALID;
break;
}
addrlen = sizeof address;
if (getsockname (fd, (struct sockaddr *) &address, &addrlen) != 0)
{
errsv = get_socket_errno ();
goto err;
}
if (addrlen > 0)
{
g_assert (G_STRUCT_OFFSET (struct sockaddr, sa_family) +
sizeof address.ss_family <= addrlen);
family = address.ss_family;
}
else
{
/* On Solaris, this happens if the socket is not yet connected.
* But we can use SO_DOMAIN as a workaround there.
*/
#ifdef SO_DOMAIN
if (!g_socket_get_option (socket, SOL_SOCKET, SO_DOMAIN, &family, NULL))
{
errsv = get_socket_errno ();
goto err;
}
#else
/* This will translate to G_IO_ERROR_FAILED on either unix or windows */
errsv = -1;
goto err;
#endif
}
switch (family)
{
case G_SOCKET_FAMILY_IPV4:
case G_SOCKET_FAMILY_IPV6:
socket->priv->family = address.ss_family;
switch (socket->priv->type)
{
case G_SOCKET_TYPE_STREAM:
socket->priv->protocol = G_SOCKET_PROTOCOL_TCP;
break;
case G_SOCKET_TYPE_DATAGRAM:
socket->priv->protocol = G_SOCKET_PROTOCOL_UDP;
break;
case G_SOCKET_TYPE_SEQPACKET:
socket->priv->protocol = G_SOCKET_PROTOCOL_SCTP;
break;
default:
break;
}
break;
case G_SOCKET_FAMILY_UNIX:
socket->priv->family = G_SOCKET_FAMILY_UNIX;
socket->priv->protocol = G_SOCKET_PROTOCOL_DEFAULT;
break;
default:
socket->priv->family = G_SOCKET_FAMILY_INVALID;
break;
}
if (socket->priv->family != G_SOCKET_FAMILY_INVALID)
{
addrlen = sizeof address;
if (getpeername (fd, (struct sockaddr *) &address, &addrlen) >= 0)
socket->priv->connected = TRUE;
}
if (g_socket_get_option (socket, SOL_SOCKET, SO_KEEPALIVE, &value, NULL))
{
socket->priv->keepalive = !!value;
}
else
{
/* Can't read, maybe not supported, assume FALSE */
socket->priv->keepalive = FALSE;
}
return;
err:
g_set_error (&socket->priv->construct_error, G_IO_ERROR,
socket_io_error_from_errno (errsv),
_("creating GSocket from fd: %s"),
socket_strerror (errsv));
}
/* Wrapper around socket() that is shared with gnetworkmonitornetlink.c */
gint
g_socket (gint domain,
gint type,
gint protocol,
GError **error)
{
int fd;
#ifdef SOCK_CLOEXEC
fd = socket (domain, type | SOCK_CLOEXEC, protocol);
if (fd != -1)
return fd;
/* It's possible that libc has SOCK_CLOEXEC but the kernel does not */
if (fd < 0 && errno == EINVAL)
#endif
fd = socket (domain, type, protocol);
if (fd < 0)
{
int errsv = get_socket_errno ();
g_set_error (error, G_IO_ERROR, socket_io_error_from_errno (errsv),
_("Unable to create socket: %s"), socket_strerror (errsv));
errno = errsv;
return -1;
}
#ifndef G_OS_WIN32
{
int flags;
/* We always want to set close-on-exec to protect users. If you
need to so some weird inheritance to exec you can re-enable this
using lower level hacks with g_socket_get_fd(). */
flags = fcntl (fd, F_GETFD, 0);
if (flags != -1 &&
(flags & FD_CLOEXEC) == 0)
{
flags |= FD_CLOEXEC;
fcntl (fd, F_SETFD, flags);
}
}
#endif
return fd;
}
static gint
g_socket_create_socket (GSocketFamily family,
GSocketType type,
int protocol,
GError **error)
{
gint native_type;
switch (type)
{
case G_SOCKET_TYPE_STREAM:
native_type = SOCK_STREAM;
break;
case G_SOCKET_TYPE_DATAGRAM:
native_type = SOCK_DGRAM;
break;
case G_SOCKET_TYPE_SEQPACKET:
native_type = SOCK_SEQPACKET;
break;
default:
g_assert_not_reached ();
}
if (family <= 0)
{
g_set_error (error, G_IO_ERROR, G_IO_ERROR_INVALID_ARGUMENT,
_("Unable to create socket: %s"), _("Unknown family was specified"));
return -1;
}
if (protocol == -1)
{
g_set_error (error, G_IO_ERROR, G_IO_ERROR_INVALID_ARGUMENT,
_("Unable to create socket: %s"), _("Unknown protocol was specified"));
return -1;
}
return g_socket (family, native_type, protocol, error);
}
static void
g_socket_constructed (GObject *object)
{
GSocket *socket = G_SOCKET (object);
if (socket->priv->fd >= 0)
/* create socket->priv info from the fd */
g_socket_details_from_fd (socket);
else
/* create the fd from socket->priv info */
socket->priv->fd = g_socket_create_socket (socket->priv->family,
socket->priv->type,
socket->priv->protocol,
&socket->priv->construct_error);
/* Always use native nonblocking sockets, as
windows sets sockets to nonblocking automatically
in certain operations. This way we make things work
the same on all platforms */
if (socket->priv->fd != -1)
set_fd_nonblocking (socket->priv->fd);
}
static void
g_socket_get_property (GObject *object,
guint prop_id,
GValue *value,
GParamSpec *pspec)
{
GSocket *socket = G_SOCKET (object);
GSocketAddress *address;
switch (prop_id)
{
case PROP_FAMILY:
g_value_set_enum (value, socket->priv->family);
break;
case PROP_TYPE:
g_value_set_enum (value, socket->priv->type);
break;
case PROP_PROTOCOL:
g_value_set_enum (value, socket->priv->protocol);
break;
case PROP_FD:
g_value_set_int (value, socket->priv->fd);
break;
case PROP_BLOCKING:
g_value_set_boolean (value, socket->priv->blocking);
break;
case PROP_LISTEN_BACKLOG:
g_value_set_int (value, socket->priv->listen_backlog);
break;
case PROP_KEEPALIVE:
g_value_set_boolean (value, socket->priv->keepalive);
break;
case PROP_LOCAL_ADDRESS:
address = g_socket_get_local_address (socket, NULL);
g_value_take_object (value, address);
break;
case PROP_REMOTE_ADDRESS:
address = g_socket_get_remote_address (socket, NULL);
g_value_take_object (value, address);
break;
case PROP_TIMEOUT:
g_value_set_uint (value, socket->priv->timeout);
break;
case PROP_TTL:
g_value_set_uint (value, g_socket_get_ttl (socket));
break;
case PROP_BROADCAST:
g_value_set_boolean (value, g_socket_get_broadcast (socket));
break;
case PROP_MULTICAST_LOOPBACK:
g_value_set_boolean (value, g_socket_get_multicast_loopback (socket));
break;
case PROP_MULTICAST_TTL:
g_value_set_uint (value, g_socket_get_multicast_ttl (socket));
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
}
}
static void
g_socket_set_property (GObject *object,
guint prop_id,
const GValue *value,
GParamSpec *pspec)
{
GSocket *socket = G_SOCKET (object);
switch (prop_id)
{
case PROP_FAMILY:
socket->priv->family = g_value_get_enum (value);
break;
case PROP_TYPE:
socket->priv->type = g_value_get_enum (value);
break;
case PROP_PROTOCOL:
socket->priv->protocol = g_value_get_enum (value);
break;
case PROP_FD:
socket->priv->fd = g_value_get_int (value);
break;
case PROP_BLOCKING:
g_socket_set_blocking (socket, g_value_get_boolean (value));
break;
case PROP_LISTEN_BACKLOG:
g_socket_set_listen_backlog (socket, g_value_get_int (value));
break;
case PROP_KEEPALIVE:
g_socket_set_keepalive (socket, g_value_get_boolean (value));
break;
case PROP_TIMEOUT:
g_socket_set_timeout (socket, g_value_get_uint (value));
break;
case PROP_TTL:
g_socket_set_ttl (socket, g_value_get_uint (value));
break;
case PROP_BROADCAST:
g_socket_set_broadcast (socket, g_value_get_boolean (value));
break;
case PROP_MULTICAST_LOOPBACK:
g_socket_set_multicast_loopback (socket, g_value_get_boolean (value));
break;
case PROP_MULTICAST_TTL:
g_socket_set_multicast_ttl (socket, g_value_get_uint (value));
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
}
}
static void
g_socket_finalize (GObject *object)
{
GSocket *socket = G_SOCKET (object);
gint i;
g_clear_error (&socket->priv->construct_error);
if (socket->priv->fd != -1 &&
!socket->priv->closed)
g_socket_close (socket, NULL);
if (socket->priv->remote_address)
g_object_unref (socket->priv->remote_address);
#ifdef G_OS_WIN32
if (socket->priv->event != WSA_INVALID_EVENT)
{
WSACloseEvent (socket->priv->event);
socket->priv->event = WSA_INVALID_EVENT;
}
g_assert (socket->priv->requested_conditions == NULL);
#endif
for (i = 0; i < RECV_ADDR_CACHE_SIZE; i++)
{
if (socket->priv->recv_addr_cache[i].addr)
{
g_object_unref (socket->priv->recv_addr_cache[i].addr);
g_free (socket->priv->recv_addr_cache[i].native);
}
}
if (G_OBJECT_CLASS (g_socket_parent_class)->finalize)
(*G_OBJECT_CLASS (g_socket_parent_class)->finalize) (object);
}
static void
g_socket_class_init (GSocketClass *klass)
{
GObjectClass *gobject_class G_GNUC_UNUSED = G_OBJECT_CLASS (klass);
#ifdef SIGPIPE
/* There is no portable, thread-safe way to avoid having the process
* be killed by SIGPIPE when calling send() or sendmsg(), so we are
* forced to simply ignore the signal process-wide.
*/
signal (SIGPIPE, SIG_IGN);
#endif
gobject_class->finalize = g_socket_finalize;
gobject_class->constructed = g_socket_constructed;
gobject_class->set_property = g_socket_set_property;
gobject_class->get_property = g_socket_get_property;
g_object_class_install_property (gobject_class, PROP_FAMILY,
g_param_spec_enum ("family",
P_("Socket family"),
P_("The sockets address family"),
G_TYPE_SOCKET_FAMILY,
G_SOCKET_FAMILY_INVALID,
G_PARAM_CONSTRUCT_ONLY |
G_PARAM_READWRITE |
G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_TYPE,
g_param_spec_enum ("type",
P_("Socket type"),
P_("The sockets type"),
G_TYPE_SOCKET_TYPE,
G_SOCKET_TYPE_STREAM,
G_PARAM_CONSTRUCT_ONLY |
G_PARAM_READWRITE |
G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_PROTOCOL,
g_param_spec_enum ("protocol",
P_("Socket protocol"),
P_("The id of the protocol to use, or -1 for unknown"),
G_TYPE_SOCKET_PROTOCOL,
G_SOCKET_PROTOCOL_UNKNOWN,
G_PARAM_CONSTRUCT_ONLY |
G_PARAM_READWRITE |
G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_FD,
g_param_spec_int ("fd",
P_("File descriptor"),
P_("The sockets file descriptor"),
G_MININT,
G_MAXINT,
-1,
G_PARAM_CONSTRUCT_ONLY |
G_PARAM_READWRITE |
G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_BLOCKING,
g_param_spec_boolean ("blocking",
P_("blocking"),
P_("Whether or not I/O on this socket is blocking"),
TRUE,
G_PARAM_READWRITE |
G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_LISTEN_BACKLOG,
g_param_spec_int ("listen-backlog",
P_("Listen backlog"),
P_("Outstanding connections in the listen queue"),
0,
SOMAXCONN,
10,
G_PARAM_READWRITE |
G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_KEEPALIVE,
g_param_spec_boolean ("keepalive",
P_("Keep connection alive"),
P_("Keep connection alive by sending periodic pings"),
FALSE,
G_PARAM_READWRITE |
G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_LOCAL_ADDRESS,
g_param_spec_object ("local-address",
P_("Local address"),
P_("The local address the socket is bound to"),
G_TYPE_SOCKET_ADDRESS,
G_PARAM_READABLE |
G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_REMOTE_ADDRESS,
g_param_spec_object ("remote-address",
P_("Remote address"),
P_("The remote address the socket is connected to"),
G_TYPE_SOCKET_ADDRESS,
G_PARAM_READABLE |
G_PARAM_STATIC_STRINGS));
/**
* GSocket:timeout:
*
* The timeout in seconds on socket I/O
*
* Since: 2.26
*/
g_object_class_install_property (gobject_class, PROP_TIMEOUT,
g_param_spec_uint ("timeout",
P_("Timeout"),
P_("The timeout in seconds on socket I/O"),
0,
G_MAXUINT,
0,
G_PARAM_READWRITE |
G_PARAM_STATIC_STRINGS));
/**
* GSocket:broadcast:
*
* Whether the socket should allow sending to and receiving from broadcast addresses.
*
* Since: 2.32
*/
g_object_class_install_property (gobject_class, PROP_BROADCAST,
g_param_spec_boolean ("broadcast",
P_("Broadcast"),
P_("Whether to allow sending to and receiving from broadcast addresses"),
FALSE,
G_PARAM_READWRITE |
G_PARAM_STATIC_STRINGS));
/**
* GSocket:ttl:
*
* Time-to-live for outgoing unicast packets
*
* Since: 2.32
*/
g_object_class_install_property (gobject_class, PROP_TTL,
g_param_spec_uint ("ttl",
P_("TTL"),
P_("Time-to-live of outgoing unicast packets"),
0, G_MAXUINT, 0,
G_PARAM_READWRITE |
G_PARAM_STATIC_STRINGS));
/**
* GSocket:multicast-loopback:
*
* Whether outgoing multicast packets loop back to the local host.
*
* Since: 2.32
*/
g_object_class_install_property (gobject_class, PROP_MULTICAST_LOOPBACK,
g_param_spec_boolean ("multicast-loopback",
P_("Multicast loopback"),
P_("Whether outgoing multicast packets loop back to the local host"),
TRUE,
G_PARAM_READWRITE |
G_PARAM_STATIC_STRINGS));
/**
* GSocket:multicast-ttl:
*
* Time-to-live out outgoing multicast packets
*
* Since: 2.32
*/
g_object_class_install_property (gobject_class, PROP_MULTICAST_TTL,
g_param_spec_uint ("multicast-ttl",
P_("Multicast TTL"),
P_("Time-to-live of outgoing multicast packets"),
0, G_MAXUINT, 1,
G_PARAM_READWRITE |
G_PARAM_STATIC_STRINGS));
}
static void
g_socket_initable_iface_init (GInitableIface *iface)
{
iface->init = g_socket_initable_init;
}
static void
g_socket_init (GSocket *socket)
{
socket->priv = g_socket_get_instance_private (socket);
socket->priv->fd = -1;
socket->priv->blocking = TRUE;
socket->priv->listen_backlog = 10;
socket->priv->construct_error = NULL;
#ifdef G_OS_WIN32
socket->priv->event = WSA_INVALID_EVENT;
#endif
}
static gboolean
g_socket_initable_init (GInitable *initable,
GCancellable *cancellable,
GError **error)
{
GSocket *socket;
g_return_val_if_fail (G_IS_SOCKET (initable), FALSE);
socket = G_SOCKET (initable);
if (cancellable != NULL)
{
g_set_error_literal (error, G_IO_ERROR, G_IO_ERROR_NOT_SUPPORTED,
_("Cancellable initialization not supported"));
return FALSE;
}
socket->priv->inited = TRUE;
if (socket->priv->construct_error)
{
if (error)
*error = g_error_copy (socket->priv->construct_error);
return FALSE;
}
return TRUE;
}
/**
* g_socket_new:
* @family: the socket family to use, e.g. %G_SOCKET_FAMILY_IPV4.
* @type: the socket type to use.
* @protocol: the id of the protocol to use, or 0 for default.
* @error: #GError for error reporting, or %NULL to ignore.
*
* Creates a new #GSocket with the defined family, type and protocol.
* If @protocol is 0 (%G_SOCKET_PROTOCOL_DEFAULT) the default protocol type
* for the family and type is used.
*
* The @protocol is a family and type specific int that specifies what
* kind of protocol to use. #GSocketProtocol lists several common ones.
* Many families only support one protocol, and use 0 for this, others
* support several and using 0 means to use the default protocol for
* the family and type.
*
* The protocol id is passed directly to the operating
* system, so you can use protocols not listed in #GSocketProtocol if you
* know the protocol number used for it.
*
* Returns: a #GSocket or %NULL on error.
* Free the returned object with g_object_unref().
*
* Since: 2.22
*/
GSocket *
g_socket_new (GSocketFamily family,
GSocketType type,
GSocketProtocol protocol,
GError **error)
{
return G_SOCKET (g_initable_new (G_TYPE_SOCKET,
NULL, error,
"family", family,
"type", type,
"protocol", protocol,
NULL));
}
/**
* g_socket_new_from_fd:
* @fd: a native socket file descriptor.
* @error: #GError for error reporting, or %NULL to ignore.
*
* Creates a new #GSocket from a native file descriptor
* or winsock SOCKET handle.
*
* This reads all the settings from the file descriptor so that
* all properties should work. Note that the file descriptor
* will be set to non-blocking mode, independent on the blocking
* mode of the #GSocket.
*
* Returns: a #GSocket or %NULL on error.
* Free the returned object with g_object_unref().
*
* Since: 2.22
*/
GSocket *
g_socket_new_from_fd (gint fd,
GError **error)
{
return G_SOCKET (g_initable_new (G_TYPE_SOCKET,
NULL, error,
"fd", fd,
NULL));
}
/**
* g_socket_set_blocking:
* @socket: a #GSocket.
* @blocking: Whether to use blocking I/O or not.
*
* Sets the blocking mode of the socket. In blocking mode
* all operations block until they succeed or there is an error. In
* non-blocking mode all functions return results immediately or
* with a %G_IO_ERROR_WOULD_BLOCK error.
*
* All sockets are created in blocking mode. However, note that the
* platform level socket is always non-blocking, and blocking mode
* is a GSocket level feature.
*
* Since: 2.22
*/
void
g_socket_set_blocking (GSocket *socket,
gboolean blocking)
{
g_return_if_fail (G_IS_SOCKET (socket));
blocking = !!blocking;
if (socket->priv->blocking == blocking)
return;
socket->priv->blocking = blocking;
g_object_notify (G_OBJECT (socket), "blocking");
}
/**
* g_socket_get_blocking:
* @socket: a #GSocket.
*
* Gets the blocking mode of the socket. For details on blocking I/O,
* see g_socket_set_blocking().
*
* Returns: %TRUE if blocking I/O is used, %FALSE otherwise.
*
* Since: 2.22
*/
gboolean
g_socket_get_blocking (GSocket *socket)
{
g_return_val_if_fail (G_IS_SOCKET (socket), FALSE);
return socket->priv->blocking;
}
/**
* g_socket_set_keepalive:
* @socket: a #GSocket.
* @keepalive: Value for the keepalive flag
*
* Sets or unsets the %SO_KEEPALIVE flag on the underlying socket. When
* this flag is set on a socket, the system will attempt to verify that the
* remote socket endpoint is still present if a sufficiently long period of
* time passes with no data being exchanged. If the system is unable to
* verify the presence of the remote endpoint, it will automatically close
* the connection.
*
* This option is only functional on certain kinds of sockets. (Notably,
* %G_SOCKET_PROTOCOL_TCP sockets.)
*
* The exact time between pings is system- and protocol-dependent, but will
* normally be at least two hours. Most commonly, you would set this flag
* on a server socket if you want to allow clients to remain idle for long
* periods of time, but also want to ensure that connections are eventually
* garbage-collected if clients crash or become unreachable.
*
* Since: 2.22
*/
void
g_socket_set_keepalive (GSocket *socket,
gboolean keepalive)
{
GError *error = NULL;
g_return_if_fail (G_IS_SOCKET (socket));
keepalive = !!keepalive;
if (socket->priv->keepalive == keepalive)
return;
if (!g_socket_set_option (socket, SOL_SOCKET, SO_KEEPALIVE,
keepalive, &error))
{
g_warning ("error setting keepalive: %s", error->message);
g_error_free (error);
return;
}
socket->priv->keepalive = keepalive;
g_object_notify (G_OBJECT (socket), "keepalive");
}
/**
* g_socket_get_keepalive:
* @socket: a #GSocket.
*
* Gets the keepalive mode of the socket. For details on this,
* see g_socket_set_keepalive().
*
* Returns: %TRUE if keepalive is active, %FALSE otherwise.
*
* Since: 2.22
*/
gboolean
g_socket_get_keepalive (GSocket *socket)
{
g_return_val_if_fail (G_IS_SOCKET (socket), FALSE);
return socket->priv->keepalive;
}
/**
* g_socket_get_listen_backlog:
* @socket: a #GSocket.
*
* Gets the listen backlog setting of the socket. For details on this,
* see g_socket_set_listen_backlog().
*
* Returns: the maximum number of pending connections.
*
* Since: 2.22
*/
gint
g_socket_get_listen_backlog (GSocket *socket)
{
g_return_val_if_fail (G_IS_SOCKET (socket), 0);
return socket->priv->listen_backlog;
}
/**
* g_socket_set_listen_backlog:
* @socket: a #GSocket.
* @backlog: the maximum number of pending connections.
*
* Sets the maximum number of outstanding connections allowed
* when listening on this socket. If more clients than this are
* connecting to the socket and the application is not handling them
* on time then the new connections will be refused.
*
* Note that this must be called before g_socket_listen() and has no
* effect if called after that.
*
* Since: 2.22
*/
void
g_socket_set_listen_backlog (GSocket *socket,
gint backlog)
{
g_return_if_fail (G_IS_SOCKET (socket));
g_return_if_fail (!socket->priv->listening);
if (backlog != socket->priv->listen_backlog)
{
socket->priv->listen_backlog = backlog;
g_object_notify (G_OBJECT (socket), "listen-backlog");
}
}
/**
* g_socket_get_timeout:
* @socket: a #GSocket.
*
* Gets the timeout setting of the socket. For details on this, see
* g_socket_set_timeout().
*
* Returns: the timeout in seconds
*
* Since: 2.26
*/
guint
g_socket_get_timeout (GSocket *socket)
{
g_return_val_if_fail (G_IS_SOCKET (socket), 0);
return socket->priv->timeout;
}
/**
* g_socket_set_timeout:
* @socket: a #GSocket.
* @timeout: the timeout for @socket, in seconds, or 0 for none
*
* Sets the time in seconds after which I/O operations on @socket will
* time out if they have not yet completed.
*
* On a blocking socket, this means that any blocking #GSocket
* operation will time out after @timeout seconds of inactivity,
* returning %G_IO_ERROR_TIMED_OUT.
*
* On a non-blocking socket, calls to g_socket_condition_wait() will
* also fail with %G_IO_ERROR_TIMED_OUT after the given time. Sources
* created with g_socket_create_source() will trigger after
* @timeout seconds of inactivity, with the requested condition
* set, at which point calling g_socket_receive(), g_socket_send(),
* g_socket_check_connect_result(), etc, will fail with
* %G_IO_ERROR_TIMED_OUT.
*
* If @timeout is 0 (the default), operations will never time out
* on their own.
*
* Note that if an I/O operation is interrupted by a signal, this may
* cause the timeout to be reset.
*
* Since: 2.26
*/
void
g_socket_set_timeout (GSocket *socket,
guint timeout)
{
g_return_if_fail (G_IS_SOCKET (socket));
if (timeout != socket->priv->timeout)
{
socket->priv->timeout = timeout;
g_object_notify (G_OBJECT (socket), "timeout");
}
}
/**
* g_socket_get_ttl:
* @socket: a #GSocket.
*
* Gets the unicast time-to-live setting on @socket; see
* g_socket_set_ttl() for more details.
*
* Returns: the time-to-live setting on @socket
*
* Since: 2.32
*/
guint
g_socket_get_ttl (GSocket *socket)
{
GError *error = NULL;
gint value;
g_return_val_if_fail (G_IS_SOCKET (socket), 0);
if (socket->priv->family == G_SOCKET_FAMILY_IPV4)
{
g_socket_get_option (socket, IPPROTO_IP, IP_TTL,
&value, &error);
}
else if (socket->priv->family == G_SOCKET_FAMILY_IPV6)
{
g_socket_get_option (socket, IPPROTO_IPV6, IPV6_UNICAST_HOPS,
&value, &error);
}
else
g_return_val_if_reached (0);
if (error)
{
g_warning ("error getting unicast ttl: %s", error->message);
g_error_free (error);
return 0;
}
return value;
}
/**
* g_socket_set_ttl:
* @socket: a #GSocket.
* @ttl: the time-to-live value for all unicast packets on @socket
*
* Sets the time-to-live for outgoing unicast packets on @socket.
* By default the platform-specific default value is used.
*
* Since: 2.32
*/
void
g_socket_set_ttl (GSocket *socket,
guint ttl)
{
GError *error = NULL;
g_return_if_fail (G_IS_SOCKET (socket));
if (socket->priv->family == G_SOCKET_FAMILY_IPV4)
{
g_socket_set_option (socket, IPPROTO_IP, IP_TTL,
ttl, &error);
}
else if (socket->priv->family == G_SOCKET_FAMILY_IPV6)
{
g_socket_set_option (socket, IPPROTO_IP, IP_TTL,
ttl, NULL);
g_socket_set_option (socket, IPPROTO_IPV6, IPV6_UNICAST_HOPS,
ttl, &error);
}
else
g_return_if_reached ();
if (error)
{
g_warning ("error setting unicast ttl: %s", error->message);
g_error_free (error);
return;
}
g_object_notify (G_OBJECT (socket), "ttl");
}
/**
* g_socket_get_broadcast:
* @socket: a #GSocket.
*
* Gets the broadcast setting on @socket; if %TRUE,
* it is possible to send packets to broadcast
* addresses or receive from broadcast addresses.
*
* Returns: the broadcast setting on @socket
*
* Since: 2.32
*/
gboolean
g_socket_get_broadcast (GSocket *socket)
{
GError *error = NULL;
gint value;
g_return_val_if_fail (G_IS_SOCKET (socket), FALSE);
if (!g_socket_get_option (socket, SOL_SOCKET, SO_BROADCAST,
&value, &error))
{
g_warning ("error getting broadcast: %s", error->message);
g_error_free (error);
return FALSE;
}
return !!value;
}
/**
* g_socket_set_broadcast:
* @socket: a #GSocket.
* @broadcast: whether @socket should allow sending to and receiving
* from broadcast addresses
*
* Sets whether @socket should allow sending to and receiving from
* broadcast addresses. This is %FALSE by default.
*
* Since: 2.32
*/
void
g_socket_set_broadcast (GSocket *socket,
gboolean broadcast)
{
GError *error = NULL;
g_return_if_fail (G_IS_SOCKET (socket));
broadcast = !!broadcast;
if (!g_socket_set_option (socket, SOL_SOCKET, SO_BROADCAST,
broadcast, &error))
{
g_warning ("error setting broadcast: %s", error->message);
g_error_free (error);
return;
}
g_object_notify (G_OBJECT (socket), "broadcast");
}
/**
* g_socket_get_multicast_loopback:
* @socket: a #GSocket.
*
* Gets the multicast loopback setting on @socket; if %TRUE (the
* default), outgoing multicast packets will be looped back to
* multicast listeners on the same host.
*
* Returns: the multicast loopback setting on @socket
*
* Since: 2.32
*/
gboolean
g_socket_get_multicast_loopback (GSocket *socket)
{
GError *error = NULL;
gint value;
g_return_val_if_fail (G_IS_SOCKET (socket), FALSE);
if (socket->priv->family == G_SOCKET_FAMILY_IPV4)
{
g_socket_get_option (socket, IPPROTO_IP, IP_MULTICAST_LOOP,
&value, &error);
}
else if (socket->priv->family == G_SOCKET_FAMILY_IPV6)
{
g_socket_get_option (socket, IPPROTO_IPV6, IPV6_MULTICAST_LOOP,
&value, &error);
}
else
g_return_val_if_reached (FALSE);
if (error)
{
g_warning ("error getting multicast loopback: %s", error->message);
g_error_free (error);
return FALSE;
}
return !!value;
}
/**
* g_socket_set_multicast_loopback:
* @socket: a #GSocket.
* @loopback: whether @socket should receive messages sent to its
* multicast groups from the local host
*
* Sets whether outgoing multicast packets will be received by sockets
* listening on that multicast address on the same host. This is %TRUE
* by default.
*
* Since: 2.32
*/
void
g_socket_set_multicast_loopback (GSocket *socket,
gboolean loopback)
{
GError *error = NULL;
g_return_if_fail (G_IS_SOCKET (socket));
loopback = !!loopback;
if (socket->priv->family == G_SOCKET_FAMILY_IPV4)
{
g_socket_set_option (socket, IPPROTO_IP, IP_MULTICAST_LOOP,
loopback, &error);
}
else if (socket->priv->family == G_SOCKET_FAMILY_IPV6)
{
g_socket_set_option (socket, IPPROTO_IP, IP_MULTICAST_LOOP,
loopback, NULL);
g_socket_set_option (socket, IPPROTO_IPV6, IPV6_MULTICAST_LOOP,
loopback, &error);
}
else
g_return_if_reached ();
if (error)
{
g_warning ("error setting multicast loopback: %s", error->message);
g_error_free (error);
return;
}
g_object_notify (G_OBJECT (socket), "multicast-loopback");
}
/**
* g_socket_get_multicast_ttl:
* @socket: a #GSocket.
*
* Gets the multicast time-to-live setting on @socket; see
* g_socket_set_multicast_ttl() for more details.
*
* Returns: the multicast time-to-live setting on @socket
*
* Since: 2.32
*/
guint
g_socket_get_multicast_ttl (GSocket *socket)
{
GError *error = NULL;
gint value;
g_return_val_if_fail (G_IS_SOCKET (socket), 0);
if (socket->priv->family == G_SOCKET_FAMILY_IPV4)
{
g_socket_get_option (socket, IPPROTO_IP, IP_MULTICAST_TTL,
&value, &error);
}
else if (socket->priv->family == G_SOCKET_FAMILY_IPV6)
{
g_socket_get_option (socket, IPPROTO_IPV6, IPV6_MULTICAST_HOPS,
&value, &error);
}
else
g_return_val_if_reached (FALSE);
if (error)
{
g_warning ("error getting multicast ttl: %s", error->message);
g_error_free (error);
return FALSE;
}
return value;
}
/**
* g_socket_set_multicast_ttl:
* @socket: a #GSocket.
* @ttl: the time-to-live value for all multicast datagrams on @socket
*
* Sets the time-to-live for outgoing multicast datagrams on @socket.
* By default, this is 1, meaning that multicast packets will not leave
* the local network.
*
* Since: 2.32
*/
void
g_socket_set_multicast_ttl (GSocket *socket,
guint ttl)
{
GError *error = NULL;
g_return_if_fail (G_IS_SOCKET (socket));
if (socket->priv->family == G_SOCKET_FAMILY_IPV4)
{
g_socket_set_option (socket, IPPROTO_IP, IP_MULTICAST_TTL,
ttl, &error);
}
else if (socket->priv->family == G_SOCKET_FAMILY_IPV6)
{
g_socket_set_option (socket, IPPROTO_IP, IP_MULTICAST_TTL,
ttl, NULL);
g_socket_set_option (socket, IPPROTO_IPV6, IPV6_MULTICAST_HOPS,
ttl, &error);
}
else
g_return_if_reached ();
if (error)
{
g_warning ("error setting multicast ttl: %s", error->message);
g_error_free (error);
return;
}
g_object_notify (G_OBJECT (socket), "multicast-ttl");
}
/**
* g_socket_get_family:
* @socket: a #GSocket.
*
* Gets the socket family of the socket.
*
* Returns: a #GSocketFamily
*
* Since: 2.22
*/
GSocketFamily
g_socket_get_family (GSocket *socket)
{
g_return_val_if_fail (G_IS_SOCKET (socket), G_SOCKET_FAMILY_INVALID);
return socket->priv->family;
}
/**
* g_socket_get_socket_type:
* @socket: a #GSocket.
*
* Gets the socket type of the socket.
*
* Returns: a #GSocketType
*
* Since: 2.22
*/
GSocketType
g_socket_get_socket_type (GSocket *socket)
{
g_return_val_if_fail (G_IS_SOCKET (socket), G_SOCKET_TYPE_INVALID);
return socket->priv->type;
}
/**
* g_socket_get_protocol:
* @socket: a #GSocket.
*
* Gets the socket protocol id the socket was created with.
* In case the protocol is unknown, -1 is returned.
*
* Returns: a protocol id, or -1 if unknown
*
* Since: 2.22
*/
GSocketProtocol
g_socket_get_protocol (GSocket *socket)
{
g_return_val_if_fail (G_IS_SOCKET (socket), -1);
return socket->priv->protocol;
}
/**
* g_socket_get_fd:
* @socket: a #GSocket.
*
* Returns the underlying OS socket object. On unix this
* is a socket file descriptor, and on Windows this is
* a Winsock2 SOCKET handle. This may be useful for
* doing platform specific or otherwise unusual operations
* on the socket.
*
* Returns: the file descriptor of the socket.
*
* Since: 2.22
*/
int
g_socket_get_fd (GSocket *socket)
{
g_return_val_if_fail (G_IS_SOCKET (socket), -1);
return socket->priv->fd;
}
/**
* g_socket_get_local_address:
* @socket: a #GSocket.
* @error: #GError for error reporting, or %NULL to ignore.
*
* Try to get the local address of a bound socket. This is only
* useful if the socket has been bound to a local address,
* either explicitly or implicitly when connecting.
*
* Returns: (transfer full): a #GSocketAddress or %NULL on error.
* Free the returned object with g_object_unref().
*
* Since: 2.22
*/
GSocketAddress *
g_socket_get_local_address (GSocket *socket,
GError **error)
{
struct sockaddr_storage buffer;
guint len = sizeof (buffer);
g_return_val_if_fail (G_IS_SOCKET (socket), NULL);
if (getsockname (socket->priv->fd, (struct sockaddr *) &buffer, &len) < 0)
{
int errsv = get_socket_errno ();
g_set_error (error, G_IO_ERROR, socket_io_error_from_errno (errsv),
_("could not get local address: %s"), socket_strerror (errsv));
return NULL;
}
return g_socket_address_new_from_native (&buffer, len);
}
/**
* g_socket_get_remote_address:
* @socket: a #GSocket.
* @error: #GError for error reporting, or %NULL to ignore.
*
* Try to get the remove address of a connected socket. This is only
* useful for connection oriented sockets that have been connected.
*
* Returns: (transfer full): a #GSocketAddress or %NULL on error.
* Free the returned object with g_object_unref().
*
* Since: 2.22
*/
GSocketAddress *
g_socket_get_remote_address (GSocket *socket,
GError **error)
{
struct sockaddr_storage buffer;
guint len = sizeof (buffer);
g_return_val_if_fail (G_IS_SOCKET (socket), NULL);
if (socket->priv->connect_pending)
{
if (!g_socket_check_connect_result (socket, error))
return NULL;
else
socket->priv->connect_pending = FALSE;
}
if (!socket->priv->remote_address)
{
if (getpeername (socket->priv->fd, (struct sockaddr *) &buffer, &len) < 0)
{
int errsv = get_socket_errno ();
g_set_error (error, G_IO_ERROR, socket_io_error_from_errno (errsv),
_("could not get remote address: %s"), socket_strerror (errsv));
return NULL;
}
socket->priv->remote_address = g_socket_address_new_from_native (&buffer, len);
}
return g_object_ref (socket->priv->remote_address);
}
/**
* g_socket_is_connected:
* @socket: a #GSocket.
*
* Check whether the socket is connected. This is only useful for
* connection-oriented sockets.
*
* Returns: %TRUE if socket is connected, %FALSE otherwise.
*
* Since: 2.22
*/
gboolean
g_socket_is_connected (GSocket *socket)
{
g_return_val_if_fail (G_IS_SOCKET (socket), FALSE);
return socket->priv->connected;
}
/**
* g_socket_listen:
* @socket: a #GSocket.
* @error: #GError for error reporting, or %NULL to ignore.
*
* Marks the socket as a server socket, i.e. a socket that is used
* to accept incoming requests using g_socket_accept().
*
* Before calling this the socket must be bound to a local address using
* g_socket_bind().
*
* To set the maximum amount of outstanding clients, use
* g_socket_set_listen_backlog().
*
* Returns: %TRUE on success, %FALSE on error.
*
* Since: 2.22
*/
gboolean
g_socket_listen (GSocket *socket,
GError **error)
{
g_return_val_if_fail (G_IS_SOCKET (socket), FALSE);
if (!check_socket (socket, error))
return FALSE;
if (listen (socket->priv->fd, socket->priv->listen_backlog) < 0)
{
int errsv = get_socket_errno ();
g_set_error (error, G_IO_ERROR, socket_io_error_from_errno (errsv),
_("could not listen: %s"), socket_strerror (errsv));
return FALSE;
}
socket->priv->listening = TRUE;
return TRUE;
}
/**
* g_socket_bind:
* @socket: a #GSocket.
* @address: a #GSocketAddress specifying the local address.
* @allow_reuse: whether to allow reusing this address
* @error: #GError for error reporting, or %NULL to ignore.
*
* When a socket is created it is attached to an address family, but it
* doesn't have an address in this family. g_socket_bind() assigns the
* address (sometimes called name) of the socket.
*
* It is generally required to bind to a local address before you can
* receive connections. (See g_socket_listen() and g_socket_accept() ).
* In certain situations, you may also want to bind a socket that will be
* used to initiate connections, though this is not normally required.
*
* @allow_reuse should be %TRUE for server sockets (sockets that you will
* eventually call g_socket_accept() on), and %FALSE for client sockets.
* (Specifically, if it is %TRUE, then g_socket_bind() will set the
* %SO_REUSEADDR flag on the socket, allowing it to bind @address even if
* that address was previously used by another socket that has not yet been
* fully cleaned-up by the kernel. Failing to set this flag on a server
* socket may cause the bind call to return %G_IO_ERROR_ADDRESS_IN_USE if
* the server program is stopped and then immediately restarted.)
*
* Returns: %TRUE on success, %FALSE on error.
*
* Since: 2.22
*/
gboolean
g_socket_bind (GSocket *socket,
GSocketAddress *address,
gboolean reuse_address,
GError **error)
{
struct sockaddr_storage addr;
g_return_val_if_fail (G_IS_SOCKET (socket) && G_IS_SOCKET_ADDRESS (address), FALSE);
if (!check_socket (socket, error))
return FALSE;
/* SO_REUSEADDR on Windows means something else and is not what we want.
It always allows the unix variant of SO_REUSEADDR anyway */
#ifndef G_OS_WIN32
{
reuse_address = !!reuse_address;
/* Ignore errors here, the only likely error is "not supported", and
this is a "best effort" thing mainly */
g_socket_set_option (socket, SOL_SOCKET, SO_REUSEADDR,
reuse_address, NULL);
}
#endif
if (!g_socket_address_to_native (address, &addr, sizeof addr, error))
return FALSE;
if (bind (socket->priv->fd, (struct sockaddr *) &addr,
g_socket_address_get_native_size (address)) < 0)
{
int errsv = get_socket_errno ();
g_set_error (error,
G_IO_ERROR, socket_io_error_from_errno (errsv),
_("Error binding to address: %s"), socket_strerror (errsv));
return FALSE;
}
return TRUE;
}
static gboolean
g_socket_multicast_group_operation (GSocket *socket,
GInetAddress *group,
gboolean source_specific,
const gchar *iface,
gboolean join_group,
GError **error)
{
const guint8 *native_addr;
gint optname, result;
g_return_val_if_fail (G_IS_SOCKET (socket), FALSE);
g_return_val_if_fail (socket->priv->type == G_SOCKET_TYPE_DATAGRAM, FALSE);
g_return_val_if_fail (G_IS_INET_ADDRESS (group), FALSE);
if (!check_socket (socket, error))
return FALSE;
native_addr = g_inet_address_to_bytes (group);
if (g_inet_address_get_family (group) == G_SOCKET_FAMILY_IPV4)
{
#ifdef HAVE_IP_MREQN
struct ip_mreqn mc_req;
#else
struct ip_mreq mc_req;
#endif
memset (&mc_req, 0, sizeof (mc_req));
memcpy (&mc_req.imr_multiaddr, native_addr, sizeof (struct in_addr));
#ifdef HAVE_IP_MREQN
if (iface)
mc_req.imr_ifindex = if_nametoindex (iface);
else
mc_req.imr_ifindex = 0; /* Pick any. */
#else
mc_req.imr_interface.s_addr = g_htonl (INADDR_ANY);
#endif
if (source_specific)
{
#ifdef IP_ADD_SOURCE_MEMBERSHIP
optname = join_group ? IP_ADD_SOURCE_MEMBERSHIP : IP_DROP_SOURCE_MEMBERSHIP;
#else
g_set_error (error, G_IO_ERROR, G_IO_ERROR_NOT_SUPPORTED,
join_group ?
_("Error joining multicast group: %s") :
_("Error leaving multicast group: %s"),
_("No support for source-specific multicast"));
return FALSE;
#endif
}
else
optname = join_group ? IP_ADD_MEMBERSHIP : IP_DROP_MEMBERSHIP;
result = setsockopt (socket->priv->fd, IPPROTO_IP, optname,
&mc_req, sizeof (mc_req));
}
else if (g_inet_address_get_family (group) == G_SOCKET_FAMILY_IPV6)
{
struct ipv6_mreq mc_req_ipv6;
memset (&mc_req_ipv6, 0, sizeof (mc_req_ipv6));
memcpy (&mc_req_ipv6.ipv6mr_multiaddr, native_addr, sizeof (struct in6_addr));
#ifdef HAVE_IF_NAMETOINDEX
if (iface)
mc_req_ipv6.ipv6mr_interface = if_nametoindex (iface);
else
#endif
mc_req_ipv6.ipv6mr_interface = 0;
optname = join_group ? IPV6_JOIN_GROUP : IPV6_LEAVE_GROUP;
result = setsockopt (socket->priv->fd, IPPROTO_IPV6, optname,
&mc_req_ipv6, sizeof (mc_req_ipv6));
}
else
g_return_val_if_reached (FALSE);
if (result < 0)
{
int errsv = get_socket_errno ();
g_set_error (error, G_IO_ERROR, socket_io_error_from_errno (errsv),
join_group ?
_("Error joining multicast group: %s") :
_("Error leaving multicast group: %s"),
socket_strerror (errsv));
return FALSE;
}
return TRUE;
}
/**
* g_socket_join_multicast_group:
* @socket: a #GSocket.
* @group: a #GInetAddress specifying the group address to join.
* @iface: (allow-none): Name of the interface to use, or %NULL
* @source_specific: %TRUE if source-specific multicast should be used
* @error: #GError for error reporting, or %NULL to ignore.
*
* Registers @socket to receive multicast messages sent to @group.
* @socket must be a %G_SOCKET_TYPE_DATAGRAM socket, and must have
* been bound to an appropriate interface and port with
* g_socket_bind().
*
* If @iface is %NULL, the system will automatically pick an interface
* to bind to based on @group.
*
* If @source_specific is %TRUE, source-specific multicast as defined
* in RFC 4604 is used. Note that on older platforms this may fail
* with a %G_IO_ERROR_NOT_SUPPORTED error.
*
* Returns: %TRUE on success, %FALSE on error.
*
* Since: 2.32
*/
gboolean
g_socket_join_multicast_group (GSocket *socket,
GInetAddress *group,
gboolean source_specific,
const gchar *iface,
GError **error)
{
return g_socket_multicast_group_operation (socket, group, source_specific, iface, TRUE, error);
}
/**
* g_socket_leave_multicast_group:
* @socket: a #GSocket.
* @group: a #GInetAddress specifying the group address to leave.
* @iface: (allow-none): Interface used
* @source_specific: %TRUE if source-specific multicast was used
* @error: #GError for error reporting, or %NULL to ignore.
*
* Removes @socket from the multicast group defined by @group, @iface,
* and @source_specific (which must all have the same values they had
* when you joined the group).
*
* @socket remains bound to its address and port, and can still receive
* unicast messages after calling this.
*
* Returns: %TRUE on success, %FALSE on error.
*
* Since: 2.32
*/
gboolean
g_socket_leave_multicast_group (GSocket *socket,
GInetAddress *group,
gboolean source_specific,
const gchar *iface,
GError **error)
{
return g_socket_multicast_group_operation (socket, group, source_specific, iface, FALSE, error);
}
/**
* g_socket_speaks_ipv4:
* @socket: a #GSocket
*
* Checks if a socket is capable of speaking IPv4.
*
* IPv4 sockets are capable of speaking IPv4. On some operating systems
* and under some combinations of circumstances IPv6 sockets are also
* capable of speaking IPv4. See RFC 3493 section 3.7 for more
* information.
*
* No other types of sockets are currently considered as being capable
* of speaking IPv4.
*
* Returns: %TRUE if this socket can be used with IPv4.
*
* Since: 2.22
**/
gboolean
g_socket_speaks_ipv4 (GSocket *socket)
{
switch (socket->priv->family)
{
case G_SOCKET_FAMILY_IPV4:
return TRUE;
case G_SOCKET_FAMILY_IPV6:
#if defined (IPPROTO_IPV6) && defined (IPV6_V6ONLY)
{
gint v6_only;
if (!g_socket_get_option (socket,
IPPROTO_IPV6, IPV6_V6ONLY,
&v6_only, NULL))
return FALSE;
return !v6_only;
}
#else
return FALSE;
#endif
default:
return FALSE;
}
}
/**
* g_socket_accept:
* @socket: a #GSocket.
* @cancellable: (allow-none): a %GCancellable or %NULL
* @error: #GError for error reporting, or %NULL to ignore.
*
* Accept incoming connections on a connection-based socket. This removes
* the first outstanding connection request from the listening socket and
* creates a #GSocket object for it.
*
* The @socket must be bound to a local address with g_socket_bind() and
* must be listening for incoming connections (g_socket_listen()).
*
* If there are no outstanding connections then the operation will block
* or return %G_IO_ERROR_WOULD_BLOCK if non-blocking I/O is enabled.
* To be notified of an incoming connection, wait for the %G_IO_IN condition.
*
* Returns: (transfer full): a new #GSocket, or %NULL on error.
* Free the returned object with g_object_unref().
*
* Since: 2.22
*/
GSocket *
g_socket_accept (GSocket *socket,
GCancellable *cancellable,
GError **error)
{
GSocket *new_socket;
gint ret;
g_return_val_if_fail (G_IS_SOCKET (socket), NULL);
if (!check_socket (socket, error))
return NULL;
while (TRUE)
{
if (socket->priv->blocking &&
!g_socket_condition_wait (socket,
G_IO_IN, cancellable, error))
return NULL;
if ((ret = accept (socket->priv->fd, NULL, 0)) < 0)
{
int errsv = get_socket_errno ();
win32_unset_event_mask (socket, FD_ACCEPT);
if (errsv == EINTR)
continue;
if (socket->priv->blocking)
{
#ifdef WSAEWOULDBLOCK
if (errsv == WSAEWOULDBLOCK)
continue;
#else
if (errsv == EWOULDBLOCK ||
errsv == EAGAIN)
continue;
#endif
}
g_set_error (error, G_IO_ERROR,
socket_io_error_from_errno (errsv),
_("Error accepting connection: %s"), socket_strerror (errsv));
return NULL;
}
break;
}
win32_unset_event_mask (socket, FD_ACCEPT);
#ifdef G_OS_WIN32
{
/* The socket inherits the accepting sockets event mask and even object,
we need to remove that */
WSAEventSelect (ret, NULL, 0);
}
#else
{
int flags;
/* We always want to set close-on-exec to protect users. If you
need to so some weird inheritance to exec you can re-enable this
using lower level hacks with g_socket_get_fd(). */
flags = fcntl (ret, F_GETFD, 0);
if (flags != -1 &&
(flags & FD_CLOEXEC) == 0)
{
flags |= FD_CLOEXEC;
fcntl (ret, F_SETFD, flags);
}
}
#endif
new_socket = g_socket_new_from_fd (ret, error);
if (new_socket == NULL)
{
#ifdef G_OS_WIN32
closesocket (ret);
#else
close (ret);
#endif
}
else
new_socket->priv->protocol = socket->priv->protocol;
return new_socket;
}
/**
* g_socket_connect:
* @socket: a #GSocket.
* @address: a #GSocketAddress specifying the remote address.
* @cancellable: (allow-none): a %GCancellable or %NULL
* @error: #GError for error reporting, or %NULL to ignore.
*
* Connect the socket to the specified remote address.
*
* For connection oriented socket this generally means we attempt to make
* a connection to the @address. For a connection-less socket it sets
* the default address for g_socket_send() and discards all incoming datagrams
* from other sources.
*
* Generally connection oriented sockets can only connect once, but
* connection-less sockets can connect multiple times to change the
* default address.
*
* If the connect call needs to do network I/O it will block, unless
* non-blocking I/O is enabled. Then %G_IO_ERROR_PENDING is returned
* and the user can be notified of the connection finishing by waiting
* for the G_IO_OUT condition. The result of the connection must then be
* checked with g_socket_check_connect_result().
*
* Returns: %TRUE if connected, %FALSE on error.
*
* Since: 2.22
*/
gboolean
g_socket_connect (GSocket *socket,
GSocketAddress *address,
GCancellable *cancellable,
GError **error)
{
struct sockaddr_storage buffer;
g_return_val_if_fail (G_IS_SOCKET (socket) && G_IS_SOCKET_ADDRESS (address), FALSE);
if (!check_socket (socket, error))
return FALSE;
if (!g_socket_address_to_native (address, &buffer, sizeof buffer, error))
return FALSE;
if (socket->priv->remote_address)
g_object_unref (socket->priv->remote_address);
socket->priv->remote_address = g_object_ref (address);
while (1)
{
if (connect (socket->priv->fd, (struct sockaddr *) &buffer,
g_socket_address_get_native_size (address)) < 0)
{
int errsv = get_socket_errno ();
if (errsv == EINTR)
continue;
#ifndef G_OS_WIN32
if (errsv == EINPROGRESS)
#else
if (errsv == WSAEWOULDBLOCK)
#endif
{
if (socket->priv->blocking)
{
if (g_socket_condition_wait (socket, G_IO_OUT, cancellable, error))
{
if (g_socket_check_connect_result (socket, error))
break;
}
}
else
{
g_set_error_literal (error, G_IO_ERROR, G_IO_ERROR_PENDING,
_("Connection in progress"));
socket->priv->connect_pending = TRUE;
}
}
else
g_set_error_literal (error, G_IO_ERROR,
socket_io_error_from_errno (errsv),
socket_strerror (errsv));
return FALSE;
}
break;
}
win32_unset_event_mask (socket, FD_CONNECT);
socket->priv->connected = TRUE;
return TRUE;
}
/**
* g_socket_check_connect_result:
* @socket: a #GSocket
* @error: #GError for error reporting, or %NULL to ignore.
*
* Checks and resets the pending connect error for the socket.
* This is used to check for errors when g_socket_connect() is
* used in non-blocking mode.
*
* Returns: %TRUE if no error, %FALSE otherwise, setting @error to the error
*
* Since: 2.22
*/
gboolean
g_socket_check_connect_result (GSocket *socket,
GError **error)
{
int value;
g_return_val_if_fail (G_IS_SOCKET (socket), FALSE);
if (!check_socket (socket, error))
return FALSE;
if (!g_socket_get_option (socket, SOL_SOCKET, SO_ERROR, &value, error))
{
g_prefix_error (error, _("Unable to get pending error: "));
return FALSE;
}
if (value != 0)
{
g_set_error_literal (error, G_IO_ERROR, socket_io_error_from_errno (value),
socket_strerror (value));
if (socket->priv->remote_address)
{
g_object_unref (socket->priv->remote_address);
socket->priv->remote_address = NULL;
}
return FALSE;
}
socket->priv->connected = TRUE;
return TRUE;
}
/**
* g_socket_get_available_bytes:
* @socket: a #GSocket
*
* Get the amount of data pending in the OS input buffer.
*
* Returns: the number of bytes that can be read from the socket
* without blocking or -1 on error.
*
* Since: 2.32
*/
gssize
g_socket_get_available_bytes (GSocket *socket)
{
gulong avail = 0;
g_return_val_if_fail (G_IS_SOCKET (socket), -1);
#ifndef G_OS_WIN32
if (ioctl (socket->priv->fd, FIONREAD, &avail) < 0)
return -1;
#else
if (ioctlsocket (socket->priv->fd, FIONREAD, &avail) == SOCKET_ERROR)
return -1;
#endif
return avail;
}
/**
* g_socket_receive:
* @socket: a #GSocket
* @buffer: (array length=size) (element-type guint8): a buffer to
* read data into (which should be at least @size bytes long).
* @size: the number of bytes you want to read from the socket
* @cancellable: (allow-none): a %GCancellable or %NULL
* @error: #GError for error reporting, or %NULL to ignore.
*
* Receive data (up to @size bytes) from a socket. This is mainly used by
* connection-oriented sockets; it is identical to g_socket_receive_from()
* with @address set to %NULL.
*
* For %G_SOCKET_TYPE_DATAGRAM and %G_SOCKET_TYPE_SEQPACKET sockets,
* g_socket_receive() will always read either 0 or 1 complete messages from
* the socket. If the received message is too large to fit in @buffer, then
* the data beyond @size bytes will be discarded, without any explicit
* indication that this has occurred.
*
* For %G_SOCKET_TYPE_STREAM sockets, g_socket_receive() can return any
* number of bytes, up to @size. If more than @size bytes have been
* received, the additional data will be returned in future calls to
* g_socket_receive().
*
* If the socket is in blocking mode the call will block until there
* is some data to receive, the connection is closed, or there is an
* error. If there is no data available and the socket is in
* non-blocking mode, a %G_IO_ERROR_WOULD_BLOCK error will be
* returned. To be notified when data is available, wait for the
* %G_IO_IN condition.
*
* On error -1 is returned and @error is set accordingly.
*
* Returns: Number of bytes read, or 0 if the connection was closed by
* the peer, or -1 on error
*
* Since: 2.22
*/
gssize
g_socket_receive (GSocket *socket,
gchar *buffer,
gsize size,
GCancellable *cancellable,
GError **error)
{
return g_socket_receive_with_blocking (socket, buffer, size,
socket->priv->blocking,
cancellable, error);
}
/**
* g_socket_receive_with_blocking:
* @socket: a #GSocket
* @buffer: (array length=size) (element-type guint8): a buffer to
* read data into (which should be at least @size bytes long).
* @size: the number of bytes you want to read from the socket
* @blocking: whether to do blocking or non-blocking I/O
* @cancellable: (allow-none): a %GCancellable or %NULL
* @error: #GError for error reporting, or %NULL to ignore.
*
* This behaves exactly the same as g_socket_receive(), except that
* the choice of blocking or non-blocking behavior is determined by
* the @blocking argument rather than by @socket's properties.
*
* Returns: Number of bytes read, or 0 if the connection was closed by
* the peer, or -1 on error
*
* Since: 2.26
*/
gssize
g_socket_receive_with_blocking (GSocket *socket,
gchar *buffer,
gsize size,
gboolean blocking,
GCancellable *cancellable,
GError **error)
{
gssize ret;
g_return_val_if_fail (G_IS_SOCKET (socket) && buffer != NULL, -1);
if (!check_socket (socket, error))
return -1;
if (g_cancellable_set_error_if_cancelled (cancellable, error))
return -1;
while (1)
{
if (blocking &&
!g_socket_condition_wait (socket,
G_IO_IN, cancellable, error))
return -1;
if ((ret = recv (socket->priv->fd, buffer, size, 0)) < 0)
{
int errsv = get_socket_errno ();
if (errsv == EINTR)
continue;
if (blocking)
{
#ifdef WSAEWOULDBLOCK
if (errsv == WSAEWOULDBLOCK)
continue;
#else
if (errsv == EWOULDBLOCK ||
errsv == EAGAIN)
continue;
#endif
}
win32_unset_event_mask (socket, FD_READ);
g_set_error (error, G_IO_ERROR,
socket_io_error_from_errno (errsv),
_("Error receiving data: %s"), socket_strerror (errsv));
return -1;
}
win32_unset_event_mask (socket, FD_READ);
break;
}
return ret;
}
/**
* g_socket_receive_from:
* @socket: a #GSocket
* @address: (out) (allow-none): a pointer to a #GSocketAddress
* pointer, or %NULL
* @buffer: (array length=size) (element-type guint8): a buffer to
* read data into (which should be at least @size bytes long).
* @size: the number of bytes you want to read from the socket
* @cancellable: (allow-none): a %GCancellable or %NULL
* @error: #GError for error reporting, or %NULL to ignore.
*
* Receive data (up to @size bytes) from a socket.
*
* If @address is non-%NULL then @address will be set equal to the
* source address of the received packet.
* @address is owned by the caller.
*
* See g_socket_receive() for additional information.
*
* Returns: Number of bytes read, or 0 if the connection was closed by
* the peer, or -1 on error
*
* Since: 2.22
*/
gssize
g_socket_receive_from (GSocket *socket,
GSocketAddress **address,
gchar *buffer,
gsize size,
GCancellable *cancellable,
GError **error)
{
GInputVector v;
v.buffer = buffer;
v.size = size;
return g_socket_receive_message (socket,
address,
&v, 1,
NULL, 0, NULL,
cancellable,
error);
}
/* Although we ignore SIGPIPE, gdb will still stop if the app receives
* one, which can be confusing and annoying. So if possible, we want
* to suppress the signal entirely.
*/
#ifdef MSG_NOSIGNAL
#define G_SOCKET_DEFAULT_SEND_FLAGS MSG_NOSIGNAL
#else
#define G_SOCKET_DEFAULT_SEND_FLAGS 0
#endif
/**
* g_socket_send:
* @socket: a #GSocket
* @buffer: (array length=size) (element-type guint8): the buffer
* containing the data to send.
* @size: the number of bytes to send
* @cancellable: (allow-none): a %GCancellable or %NULL
* @error: #GError for error reporting, or %NULL to ignore.
*
* Tries to send @size bytes from @buffer on the socket. This is
* mainly used by connection-oriented sockets; it is identical to
* g_socket_send_to() with @address set to %NULL.
*
* If the socket is in blocking mode the call will block until there is
* space for the data in the socket queue. If there is no space available
* and the socket is in non-blocking mode a %G_IO_ERROR_WOULD_BLOCK error
* will be returned. To be notified when space is available, wait for the
* %G_IO_OUT condition. Note though that you may still receive
* %G_IO_ERROR_WOULD_BLOCK from g_socket_send() even if you were previously
* notified of a %G_IO_OUT condition. (On Windows in particular, this is
* very common due to the way the underlying APIs work.)
*
* On error -1 is returned and @error is set accordingly.
*
* Returns: Number of bytes written (which may be less than @size), or -1
* on error
*
* Since: 2.22
*/
gssize
g_socket_send (GSocket *socket,
const gchar *buffer,
gsize size,
GCancellable *cancellable,
GError **error)
{
return g_socket_send_with_blocking (socket, buffer, size,
socket->priv->blocking,
cancellable, error);
}
/**
* g_socket_send_with_blocking:
* @socket: a #GSocket
* @buffer: (array length=size) (element-type guint8): the buffer
* containing the data to send.
* @size: the number of bytes to send
* @blocking: whether to do blocking or non-blocking I/O
* @cancellable: (allow-none): a %GCancellable or %NULL
* @error: #GError for error reporting, or %NULL to ignore.
*
* This behaves exactly the same as g_socket_send(), except that
* the choice of blocking or non-blocking behavior is determined by
* the @blocking argument rather than by @socket's properties.
*
* Returns: Number of bytes written (which may be less than @size), or -1
* on error
*
* Since: 2.26
*/
gssize
g_socket_send_with_blocking (GSocket *socket,
const gchar *buffer,
gsize size,
gboolean blocking,
GCancellable *cancellable,
GError **error)
{
gssize ret;
g_return_val_if_fail (G_IS_SOCKET (socket) && buffer != NULL, -1);
if (!check_socket (socket, error))
return -1;
if (g_cancellable_set_error_if_cancelled (cancellable, error))
return -1;
while (1)
{
if (blocking &&
!g_socket_condition_wait (socket,
G_IO_OUT, cancellable, error))
return -1;
if ((ret = send (socket->priv->fd, buffer, size, G_SOCKET_DEFAULT_SEND_FLAGS)) < 0)
{
int errsv = get_socket_errno ();
if (errsv == EINTR)
continue;
#ifdef WSAEWOULDBLOCK
if (errsv == WSAEWOULDBLOCK)
win32_unset_event_mask (socket, FD_WRITE);
#endif
if (blocking)
{
#ifdef WSAEWOULDBLOCK
if (errsv == WSAEWOULDBLOCK)
continue;
#else
if (errsv == EWOULDBLOCK ||
errsv == EAGAIN)
continue;
#endif
}
g_set_error (error, G_IO_ERROR,
socket_io_error_from_errno (errsv),
_("Error sending data: %s"), socket_strerror (errsv));
return -1;
}
break;
}
return ret;
}
/**
* g_socket_send_to:
* @socket: a #GSocket
* @address: (allow-none): a #GSocketAddress, or %NULL
* @buffer: (array length=size) (element-type guint8): the buffer
* containing the data to send.
* @size: the number of bytes to send
* @cancellable: (allow-none): a %GCancellable or %NULL
* @error: #GError for error reporting, or %NULL to ignore.
*
* Tries to send @size bytes from @buffer to @address. If @address is
* %NULL then the message is sent to the default receiver (set by
* g_socket_connect()).
*
* See g_socket_send() for additional information.
*
* Returns: Number of bytes written (which may be less than @size), or -1
* on error
*
* Since: 2.22
*/
gssize
g_socket_send_to (GSocket *socket,
GSocketAddress *address,
const gchar *buffer,
gsize size,
GCancellable *cancellable,
GError **error)
{
GOutputVector v;
v.buffer = buffer;
v.size = size;
return g_socket_send_message (socket,
address,
&v, 1,
NULL, 0,
0,
cancellable,
error);
}
/**
* g_socket_shutdown:
* @socket: a #GSocket
* @shutdown_read: whether to shut down the read side
* @shutdown_write: whether to shut down the write side
* @error: #GError for error reporting, or %NULL to ignore.
*
* Shut down part of a full-duplex connection.
*
* If @shutdown_read is %TRUE then the receiving side of the connection
* is shut down, and further reading is disallowed.
*
* If @shutdown_write is %TRUE then the sending side of the connection
* is shut down, and further writing is disallowed.
*
* It is allowed for both @shutdown_read and @shutdown_write to be %TRUE.
*
* One example where this is used is graceful disconnect for TCP connections
* where you close the sending side, then wait for the other side to close
* the connection, thus ensuring that the other side saw all sent data.
*
* Returns: %TRUE on success, %FALSE on error
*
* Since: 2.22
*/
gboolean
g_socket_shutdown (GSocket *socket,
gboolean shutdown_read,
gboolean shutdown_write,
GError **error)
{
int how;
g_return_val_if_fail (G_IS_SOCKET (socket), TRUE);
if (!check_socket (socket, error))
return FALSE;
/* Do nothing? */
if (!shutdown_read && !shutdown_write)
return TRUE;
#ifndef G_OS_WIN32
if (shutdown_read && shutdown_write)
how = SHUT_RDWR;
else if (shutdown_read)
how = SHUT_RD;
else
how = SHUT_WR;
#else
if (shutdown_read && shutdown_write)
how = SD_BOTH;
else if (shutdown_read)
how = SD_RECEIVE;
else
how = SD_SEND;
#endif
if (shutdown (socket->priv->fd, how) != 0)
{
int errsv = get_socket_errno ();
g_set_error (error, G_IO_ERROR, socket_io_error_from_errno (errsv),
_("Unable to shutdown socket: %s"), socket_strerror (errsv));
return FALSE;
}
if (shutdown_read && shutdown_write)
socket->priv->connected = FALSE;
return TRUE;
}
/**
* g_socket_close:
* @socket: a #GSocket
* @error: #GError for error reporting, or %NULL to ignore.
*
* Closes the socket, shutting down any active connection.
*
* Closing a socket does not wait for all outstanding I/O operations
* to finish, so the caller should not rely on them to be guaranteed
* to complete even if the close returns with no error.
*
* Once the socket is closed, all other operations will return
* %G_IO_ERROR_CLOSED. Closing a socket multiple times will not
* return an error.
*
* Sockets will be automatically closed when the last reference
* is dropped, but you might want to call this function to make sure
* resources are released as early as possible.
*
* Beware that due to the way that TCP works, it is possible for
* recently-sent data to be lost if either you close a socket while the
* %G_IO_IN condition is set, or else if the remote connection tries to
* send something to you after you close the socket but before it has
* finished reading all of the data you sent. There is no easy generic
* way to avoid this problem; the easiest fix is to design the network
* protocol such that the client will never send data "out of turn".
* Another solution is for the server to half-close the connection by
* calling g_socket_shutdown() with only the @shutdown_write flag set,
* and then wait for the client to notice this and close its side of the
* connection, after which the server can safely call g_socket_close().
* (This is what #GTcpConnection does if you call
* g_tcp_connection_set_graceful_disconnect(). But of course, this
* only works if the client will close its connection after the server
* does.)
*
* Returns: %TRUE on success, %FALSE on error
*
* Since: 2.22
*/
gboolean
g_socket_close (GSocket *socket,
GError **error)
{
int res;
g_return_val_if_fail (G_IS_SOCKET (socket), TRUE);
if (socket->priv->closed)
return TRUE; /* Multiple close not an error */
if (!check_socket (socket, error))
return FALSE;
while (1)
{
#ifdef G_OS_WIN32
res = closesocket (socket->priv->fd);
#else
res = close (socket->priv->fd);
#endif
if (res == -1)
{
int errsv = get_socket_errno ();
if (errsv == EINTR)
continue;
g_set_error (error, G_IO_ERROR,
socket_io_error_from_errno (errsv),
_("Error closing socket: %s"),
socket_strerror (errsv));
return FALSE;
}
break;
}
socket->priv->connected = FALSE;
socket->priv->closed = TRUE;
if (socket->priv->remote_address)
{
g_object_unref (socket->priv->remote_address);
socket->priv->remote_address = NULL;
}
return TRUE;
}
/**
* g_socket_is_closed:
* @socket: a #GSocket
*
* Checks whether a socket is closed.
*
* Returns: %TRUE if socket is closed, %FALSE otherwise
*
* Since: 2.22
*/
gboolean
g_socket_is_closed (GSocket *socket)
{
return socket->priv->closed;
}
#ifdef G_OS_WIN32
/* Broken source, used on errors */
static gboolean
broken_dispatch (GSource *source,
GSourceFunc callback,
gpointer user_data)
{
return TRUE;
}
static GSourceFuncs broken_funcs =
{
NULL,
NULL,
broken_dispatch,
NULL
};
static gint
network_events_for_condition (GIOCondition condition)
{
int event_mask = 0;
if (condition & G_IO_IN)
event_mask |= (FD_READ | FD_ACCEPT);
if (condition & G_IO_OUT)
event_mask |= (FD_WRITE | FD_CONNECT);
event_mask |= FD_CLOSE;
return event_mask;
}
static void
ensure_event (GSocket *socket)
{
if (socket->priv->event == WSA_INVALID_EVENT)
socket->priv->event = WSACreateEvent();
}
static void
update_select_events (GSocket *socket)
{
int event_mask;
GIOCondition *ptr;
GList *l;
WSAEVENT event;
ensure_event (socket);
event_mask = 0;
for (l = socket->priv->requested_conditions; l != NULL; l = l->next)
{
ptr = l->data;
event_mask |= network_events_for_condition (*ptr);
}
if (event_mask != socket->priv->selected_events)
{
/* If no events selected, disable event so we can unset
nonblocking mode */
if (event_mask == 0)
event = NULL;
else
event = socket->priv->event;
if (WSAEventSelect (socket->priv->fd, event, event_mask) == 0)
socket->priv->selected_events = event_mask;
}
}
static void
add_condition_watch (GSocket *socket,
GIOCondition *condition)
{
g_assert (g_list_find (socket->priv->requested_conditions, condition) == NULL);
socket->priv->requested_conditions =
g_list_prepend (socket->priv->requested_conditions, condition);
update_select_events (socket);
}
static void
remove_condition_watch (GSocket *socket,
GIOCondition *condition)
{
g_assert (g_list_find (socket->priv->requested_conditions, condition) != NULL);
socket->priv->requested_conditions =
g_list_remove (socket->priv->requested_conditions, condition);
update_select_events (socket);
}
static GIOCondition
update_condition (GSocket *socket)
{
WSANETWORKEVENTS events;
GIOCondition condition;
if (WSAEnumNetworkEvents (socket->priv->fd,
socket->priv->event,
&events) == 0)
{
socket->priv->current_events |= events.lNetworkEvents;
if (events.lNetworkEvents & FD_WRITE &&
events.iErrorCode[FD_WRITE_BIT] != 0)
socket->priv->current_errors |= FD_WRITE;
if (events.lNetworkEvents & FD_CONNECT &&
events.iErrorCode[FD_CONNECT_BIT] != 0)
socket->priv->current_errors |= FD_CONNECT;
}
condition = 0;
if (socket->priv->current_events & (FD_READ | FD_ACCEPT))
condition |= G_IO_IN;
if (socket->priv->current_events & FD_CLOSE)
{
int r, errsv, buffer;
r = recv (socket->priv->fd, &buffer, sizeof (buffer), MSG_PEEK);
if (r < 0)
errsv = get_socket_errno ();
if (r > 0 ||
(r < 0 && errsv == WSAENOTCONN))
condition |= G_IO_IN;
else if (r == 0 ||
(r < 0 && (errsv == WSAESHUTDOWN || errsv == WSAECONNRESET ||
errsv == WSAECONNABORTED || errsv == WSAENETRESET)))
condition |= G_IO_HUP;
else
condition |= G_IO_ERR;
}
if (socket->priv->closed)
condition |= G_IO_HUP;
/* Never report both G_IO_OUT and HUP, these are
mutually exclusive (can't write to a closed socket) */
if ((condition & G_IO_HUP) == 0 &&
socket->priv->current_events & FD_WRITE)
{
if (socket->priv->current_errors & FD_WRITE)
condition |= G_IO_ERR;
else
condition |= G_IO_OUT;
}
else
{
if (socket->priv->current_events & FD_CONNECT)
{
if (socket->priv->current_errors & FD_CONNECT)
condition |= (G_IO_HUP | G_IO_ERR);
else
condition |= G_IO_OUT;
}
}
return condition;
}
#endif
typedef struct {
GSource source;
GPollFD pollfd;
GSocket *socket;
GIOCondition condition;
GCancellable *cancellable;
GPollFD cancel_pollfd;
gint64 timeout_time;
} GSocketSource;
static gboolean
socket_source_prepare (GSource *source,
gint *timeout)
{
GSocketSource *socket_source = (GSocketSource *)source;
if (g_cancellable_is_cancelled (socket_source->cancellable))
return TRUE;
if (socket_source->timeout_time)
{
gint64 now;
now = g_source_get_time (source);
/* Round up to ensure that we don't try again too early */
*timeout = (socket_source->timeout_time - now + 999) / 1000;
if (*timeout < 0)
{
socket_source->socket->priv->timed_out = TRUE;
*timeout = 0;
return TRUE;
}
}
else
*timeout = -1;
#ifdef G_OS_WIN32
socket_source->pollfd.revents = update_condition (socket_source->socket);
#endif
if ((socket_source->condition & socket_source->pollfd.revents) != 0)
return TRUE;
return FALSE;
}
static gboolean
socket_source_check (GSource *source)
{
int timeout;
return socket_source_prepare (source, &timeout);
}
static gboolean
socket_source_dispatch (GSource *source,
GSourceFunc callback,
gpointer user_data)
{
GSocketSourceFunc func = (GSocketSourceFunc)callback;
GSocketSource *socket_source = (GSocketSource *)source;
GSocket *socket = socket_source->socket;
gboolean ret;
#ifdef G_OS_WIN32
socket_source->pollfd.revents = update_condition (socket_source->socket);
#endif
if (socket_source->socket->priv->timed_out)
socket_source->pollfd.revents |= socket_source->condition & (G_IO_IN | G_IO_OUT);
ret = (*func) (socket,
socket_source->pollfd.revents & socket_source->condition,
user_data);
if (socket->priv->timeout)
socket_source->timeout_time = g_get_monotonic_time () +
socket->priv->timeout * 1000000;
else
socket_source->timeout_time = 0;
return ret;
}
static void
socket_source_finalize (GSource *source)
{
GSocketSource *socket_source = (GSocketSource *)source;
GSocket *socket;
socket = socket_source->socket;
#ifdef G_OS_WIN32
remove_condition_watch (socket, &socket_source->condition);
#endif
g_object_unref (socket);
if (socket_source->cancellable)
{
g_cancellable_release_fd (socket_source->cancellable);
g_object_unref (socket_source->cancellable);
}
}
static gboolean
socket_source_closure_callback (GSocket *socket,
GIOCondition condition,
gpointer data)
{
GClosure *closure = data;
GValue params[2] = { G_VALUE_INIT, G_VALUE_INIT };
GValue result_value = G_VALUE_INIT;
gboolean result;
g_value_init (&result_value, G_TYPE_BOOLEAN);
g_value_init (&params[0], G_TYPE_SOCKET);
g_value_set_object (&params[0], socket);
g_value_init (&params[1], G_TYPE_IO_CONDITION);
g_value_set_flags (&params[1], condition);
g_closure_invoke (closure, &result_value, 2, params, NULL);
result = g_value_get_boolean (&result_value);
g_value_unset (&result_value);
g_value_unset (&params[0]);
g_value_unset (&params[1]);
return result;
}
static GSourceFuncs socket_source_funcs =
{
socket_source_prepare,
socket_source_check,
socket_source_dispatch,
socket_source_finalize,
(GSourceFunc)socket_source_closure_callback,
};
static GSource *
socket_source_new (GSocket *socket,
GIOCondition condition,
GCancellable *cancellable)
{
GSource *source;
GSocketSource *socket_source;
#ifdef G_OS_WIN32
ensure_event (socket);
if (socket->priv->event == WSA_INVALID_EVENT)
{
g_warning ("Failed to create WSAEvent");
return g_source_new (&broken_funcs, sizeof (GSource));
}
#endif
condition |= G_IO_HUP | G_IO_ERR;
source = g_source_new (&socket_source_funcs, sizeof (GSocketSource));
g_source_set_name (source, "GSocket");
socket_source = (GSocketSource *)source;
socket_source->socket = g_object_ref (socket);
socket_source->condition = condition;
if (g_cancellable_make_pollfd (cancellable,
&socket_source->cancel_pollfd))
{
socket_source->cancellable = g_object_ref (cancellable);
g_source_add_poll (source, &socket_source->cancel_pollfd);
}
#ifdef G_OS_WIN32
add_condition_watch (socket, &socket_source->condition);
socket_source->pollfd.fd = (gintptr) socket->priv->event;
#else
socket_source->pollfd.fd = socket->priv->fd;
#endif
socket_source->pollfd.events = condition;
socket_source->pollfd.revents = 0;
g_source_add_poll (source, &socket_source->pollfd);
if (socket->priv->timeout)
socket_source->timeout_time = g_get_monotonic_time () +
socket->priv->timeout * 1000000;
else
socket_source->timeout_time = 0;
return source;
}
/**
* g_socket_create_source: (skip)
* @socket: a #GSocket
* @condition: a #GIOCondition mask to monitor
* @cancellable: (allow-none): a %GCancellable or %NULL
*
* Creates a %GSource that can be attached to a %GMainContext to monitor
* for the availibility of the specified @condition on the socket.
*
* The callback on the source is of the #GSocketSourceFunc type.
*
* It is meaningless to specify %G_IO_ERR or %G_IO_HUP in @condition;
* these conditions will always be reported output if they are true.
*
* @cancellable if not %NULL can be used to cancel the source, which will
* cause the source to trigger, reporting the current condition (which
* is likely 0 unless cancellation happened at the same time as a
* condition change). You can check for this in the callback using
* g_cancellable_is_cancelled().
*
* If @socket has a timeout set, and it is reached before @condition
* occurs, the source will then trigger anyway, reporting %G_IO_IN or
* %G_IO_OUT depending on @condition. However, @socket will have been
* marked as having had a timeout, and so the next #GSocket I/O method
* you call will then fail with a %G_IO_ERROR_TIMED_OUT.
*
* Returns: (transfer full): a newly allocated %GSource, free with g_source_unref().
*
* Since: 2.22
*/
GSource *
g_socket_create_source (GSocket *socket,
GIOCondition condition,
GCancellable *cancellable)
{
g_return_val_if_fail (G_IS_SOCKET (socket) && (cancellable == NULL || G_IS_CANCELLABLE (cancellable)), NULL);
return socket_source_new (socket, condition, cancellable);
}
/**
* g_socket_condition_check:
* @socket: a #GSocket
* @condition: a #GIOCondition mask to check
*
* Checks on the readiness of @socket to perform operations.
* The operations specified in @condition are checked for and masked
* against the currently-satisfied conditions on @socket. The result
* is returned.
*
* Note that on Windows, it is possible for an operation to return
* %G_IO_ERROR_WOULD_BLOCK even immediately after
* g_socket_condition_check() has claimed that the socket is ready for
* writing. Rather than calling g_socket_condition_check() and then
* writing to the socket if it succeeds, it is generally better to
* simply try writing to the socket right away, and try again later if
* the initial attempt returns %G_IO_ERROR_WOULD_BLOCK.
*
* It is meaningless to specify %G_IO_ERR or %G_IO_HUP in condition;
* these conditions will always be set in the output if they are true.
*
* This call never blocks.
*
* Returns: the @GIOCondition mask of the current state
*
* Since: 2.22
*/
GIOCondition
g_socket_condition_check (GSocket *socket,
GIOCondition condition)
{
g_return_val_if_fail (G_IS_SOCKET (socket), 0);
if (!check_socket (socket, NULL))
return 0;
#ifdef G_OS_WIN32
{
GIOCondition current_condition;
condition |= G_IO_ERR | G_IO_HUP;
add_condition_watch (socket, &condition);
current_condition = update_condition (socket);
remove_condition_watch (socket, &condition);
return condition & current_condition;
}
#else
{
GPollFD poll_fd;
gint result;
poll_fd.fd = socket->priv->fd;
poll_fd.events = condition;
poll_fd.revents = 0;
do
result = g_poll (&poll_fd, 1, 0);
while (result == -1 && get_socket_errno () == EINTR);
return poll_fd.revents;
}
#endif
}
/**
* g_socket_condition_wait:
* @socket: a #GSocket
* @condition: a #GIOCondition mask to wait for
* @cancellable: (allow-none): a #GCancellable, or %NULL
* @error: a #GError pointer, or %NULL
*
* Waits for @condition to become true on @socket. When the condition
* is met, %TRUE is returned.
*
* If @cancellable is cancelled before the condition is met, or if the
* socket has a timeout set and it is reached before the condition is
* met, then %FALSE is returned and @error, if non-%NULL, is set to
* the appropriate value (%G_IO_ERROR_CANCELLED or
* %G_IO_ERROR_TIMED_OUT).
*
* See also g_socket_condition_timed_wait().
*
* Returns: %TRUE if the condition was met, %FALSE otherwise
*
* Since: 2.22
*/
gboolean
g_socket_condition_wait (GSocket *socket,
GIOCondition condition,
GCancellable *cancellable,
GError **error)
{
g_return_val_if_fail (G_IS_SOCKET (socket), FALSE);
return g_socket_condition_timed_wait (socket, condition, -1,
cancellable, error);
}
/**
* g_socket_condition_timed_wait:
* @socket: a #GSocket
* @condition: a #GIOCondition mask to wait for
* @timeout: the maximum time (in microseconds) to wait, or -1
* @cancellable: (allow-none): a #GCancellable, or %NULL
* @error: a #GError pointer, or %NULL
*
* Waits for up to @timeout microseconds for @condition to become true
* on @socket. If the condition is met, %TRUE is returned.
*
* If @cancellable is cancelled before the condition is met, or if
* @timeout (or the socket's #GSocket:timeout) is reached before the
* condition is met, then %FALSE is returned and @error, if non-%NULL,
* is set to the appropriate value (%G_IO_ERROR_CANCELLED or
* %G_IO_ERROR_TIMED_OUT).
*
* If you don't want a timeout, use g_socket_condition_wait().
* (Alternatively, you can pass -1 for @timeout.)
*
* Note that although @timeout is in microseconds for consistency with
* other GLib APIs, this function actually only has millisecond
* resolution, and the behavior is undefined if @timeout is not an
* exact number of milliseconds.
*
* Returns: %TRUE if the condition was met, %FALSE otherwise
*
* Since: 2.32
*/
gboolean
g_socket_condition_timed_wait (GSocket *socket,
GIOCondition condition,
gint64 timeout,
GCancellable *cancellable,
GError **error)
{
gint64 start_time;
g_return_val_if_fail (G_IS_SOCKET (socket), FALSE);
if (!check_socket (socket, error))
return FALSE;
if (g_cancellable_set_error_if_cancelled (cancellable, error))
return FALSE;
if (socket->priv->timeout &&
(timeout < 0 || socket->priv->timeout < timeout / G_USEC_PER_SEC))
timeout = socket->priv->timeout * 1000;
else if (timeout != -1)
timeout = timeout / 1000;
start_time = g_get_monotonic_time ();
#ifdef G_OS_WIN32
{
GIOCondition current_condition;
WSAEVENT events[2];
DWORD res;
GPollFD cancel_fd;
int num_events;
/* Always check these */
condition |= G_IO_ERR | G_IO_HUP;
add_condition_watch (socket, &condition);
num_events = 0;
events[num_events++] = socket->priv->event;
if (g_cancellable_make_pollfd (cancellable, &cancel_fd))
events[num_events++] = (WSAEVENT)cancel_fd.fd;
if (timeout == -1)
timeout = WSA_INFINITE;
current_condition = update_condition (socket);
while ((condition & current_condition) == 0)
{
res = WSAWaitForMultipleEvents (num_events, events,
FALSE, timeout, FALSE);
if (res == WSA_WAIT_FAILED)
{
int errsv = get_socket_errno ();
g_set_error (error, G_IO_ERROR,
socket_io_error_from_errno (errsv),
_("Waiting for socket condition: %s"),
socket_strerror (errsv));
break;
}
else if (res == WSA_WAIT_TIMEOUT)
{
g_set_error_literal (error, G_IO_ERROR, G_IO_ERROR_TIMED_OUT,
_("Socket I/O timed out"));
break;
}
if (g_cancellable_set_error_if_cancelled (cancellable, error))
break;
current_condition = update_condition (socket);
if (timeout != WSA_INFINITE)
{
timeout -= (g_get_monotonic_time () - start_time) * 1000;
if (timeout < 0)
timeout = 0;
}
}
remove_condition_watch (socket, &condition);
if (num_events > 1)
g_cancellable_release_fd (cancellable);
return (condition & current_condition) != 0;
}
#else
{
GPollFD poll_fd[2];
gint result;
gint num;
poll_fd[0].fd = socket->priv->fd;
poll_fd[0].events = condition;
num = 1;
if (g_cancellable_make_pollfd (cancellable, &poll_fd[1]))
num++;
while (TRUE)
{
result = g_poll (poll_fd, num, timeout);
if (result != -1 || errno != EINTR)
break;
if (timeout != -1)
{
timeout -= (g_get_monotonic_time () - start_time) * 1000;
if (timeout < 0)
timeout = 0;
}
}
if (num > 1)
g_cancellable_release_fd (cancellable);
if (result == 0)
{
g_set_error_literal (error, G_IO_ERROR, G_IO_ERROR_TIMED_OUT,
_("Socket I/O timed out"));
return FALSE;
}
return !g_cancellable_set_error_if_cancelled (cancellable, error);
}
#endif
}
/**
* g_socket_send_message:
* @socket: a #GSocket
* @address: (allow-none): a #GSocketAddress, or %NULL
* @vectors: (array length=num_vectors): an array of #GOutputVector structs
* @num_vectors: the number of elements in @vectors, or -1
* @messages: (array length=num_messages) (allow-none): a pointer to an
* array of #GSocketControlMessages, or %NULL.
* @num_messages: number of elements in @messages, or -1.
* @flags: an int containing #GSocketMsgFlags flags
* @cancellable: (allow-none): a %GCancellable or %NULL
* @error: #GError for error reporting, or %NULL to ignore.
*
* Send data to @address on @socket. This is the most complicated and
* fully-featured version of this call. For easier use, see
* g_socket_send() and g_socket_send_to().
*
* If @address is %NULL then the message is sent to the default receiver
* (set by g_socket_connect()).
*
* @vectors must point to an array of #GOutputVector structs and
* @num_vectors must be the length of this array. (If @num_vectors is -1,
* then @vectors is assumed to be terminated by a #GOutputVector with a
* %NULL buffer pointer.) The #GOutputVector structs describe the buffers
* that the sent data will be gathered from. Using multiple
* #GOutputVector<!-- -->s is more memory-efficient than manually copying
* data from multiple sources into a single buffer, and more
* network-efficient than making multiple calls to g_socket_send().
*
* @messages, if non-%NULL, is taken to point to an array of @num_messages
* #GSocketControlMessage instances. These correspond to the control
* messages to be sent on the socket.
* If @num_messages is -1 then @messages is treated as a %NULL-terminated
* array.
*
* @flags modify how the message is sent. The commonly available arguments
* for this are available in the #GSocketMsgFlags enum, but the
* values there are the same as the system values, and the flags
* are passed in as-is, so you can pass in system-specific flags too.
*
* If the socket is in blocking mode the call will block until there is
* space for the data in the socket queue. If there is no space available
* and the socket is in non-blocking mode a %G_IO_ERROR_WOULD_BLOCK error
* will be returned. To be notified when space is available, wait for the
* %G_IO_OUT condition. Note though that you may still receive
* %G_IO_ERROR_WOULD_BLOCK from g_socket_send() even if you were previously
* notified of a %G_IO_OUT condition. (On Windows in particular, this is
* very common due to the way the underlying APIs work.)
*
* On error -1 is returned and @error is set accordingly.
*
* Returns: Number of bytes written (which may be less than @size), or -1
* on error
*
* Since: 2.22
*/
gssize
g_socket_send_message (GSocket *socket,
GSocketAddress *address,
GOutputVector *vectors,
gint num_vectors,
GSocketControlMessage **messages,
gint num_messages,
gint flags,
GCancellable *cancellable,
GError **error)
{
GOutputVector one_vector;
char zero;
g_return_val_if_fail (G_IS_SOCKET (socket), -1);
if (!check_socket (socket, error))
return -1;
if (g_cancellable_set_error_if_cancelled (cancellable, error))
return -1;
if (num_vectors == -1)
{
for (num_vectors = 0;
vectors[num_vectors].buffer != NULL;
num_vectors++)
;
}
if (num_messages == -1)
{
for (num_messages = 0;
messages != NULL && messages[num_messages] != NULL;
num_messages++)
;
}
if (num_vectors == 0)
{
zero = '\0';
one_vector.buffer = &zero;
one_vector.size = 1;
num_vectors = 1;
vectors = &one_vector;
}
#ifndef G_OS_WIN32
{
struct msghdr msg;
gssize result;
msg.msg_flags = 0;
/* name */
if (address)
{
msg.msg_namelen = g_socket_address_get_native_size (address);
msg.msg_name = g_alloca (msg.msg_namelen);
if (!g_socket_address_to_native (address, msg.msg_name, msg.msg_namelen, error))
return -1;
}
else
{
msg.msg_name = NULL;
msg.msg_namelen = 0;
}
/* iov */
{
/* this entire expression will be evaluated at compile time */
if (sizeof *msg.msg_iov == sizeof *vectors &&
sizeof msg.msg_iov->iov_base == sizeof vectors->buffer &&
G_STRUCT_OFFSET (struct iovec, iov_base) ==
G_STRUCT_OFFSET (GOutputVector, buffer) &&
sizeof msg.msg_iov->iov_len == sizeof vectors->size &&
G_STRUCT_OFFSET (struct iovec, iov_len) ==
G_STRUCT_OFFSET (GOutputVector, size))
/* ABI is compatible */
{
msg.msg_iov = (struct iovec *) vectors;
msg.msg_iovlen = num_vectors;
}
else
/* ABI is incompatible */
{
gint i;
msg.msg_iov = g_newa (struct iovec, num_vectors);
for (i = 0; i < num_vectors; i++)
{
msg.msg_iov[i].iov_base = (void *) vectors[i].buffer;
msg.msg_iov[i].iov_len = vectors[i].size;
}
msg.msg_iovlen = num_vectors;
}
}
/* control */
{
struct cmsghdr *cmsg;
gint i;
msg.msg_controllen = 0;
for (i = 0; i < num_messages; i++)
msg.msg_controllen += CMSG_SPACE (g_socket_control_message_get_size (messages[i]));
if (msg.msg_controllen == 0)
msg.msg_control = NULL;
else
{
msg.msg_control = g_alloca (msg.msg_controllen);
memset (msg.msg_control, '\0', msg.msg_controllen);
}
cmsg = CMSG_FIRSTHDR (&msg);
for (i = 0; i < num_messages; i++)
{
cmsg->cmsg_level = g_socket_control_message_get_level (messages[i]);
cmsg->cmsg_type = g_socket_control_message_get_msg_type (messages[i]);
cmsg->cmsg_len = CMSG_LEN (g_socket_control_message_get_size (messages[i]));
g_socket_control_message_serialize (messages[i],
CMSG_DATA (cmsg));
cmsg = CMSG_NXTHDR (&msg, cmsg);
}
g_assert (cmsg == NULL);
}
while (1)
{
if (socket->priv->blocking &&
!g_socket_condition_wait (socket,
G_IO_OUT, cancellable, error))
return -1;
result = sendmsg (socket->priv->fd, &msg, flags | G_SOCKET_DEFAULT_SEND_FLAGS);
if (result < 0)
{
int errsv = get_socket_errno ();
if (errsv == EINTR)
continue;
if (socket->priv->blocking &&
(errsv == EWOULDBLOCK ||
errsv == EAGAIN))
continue;
g_set_error (error, G_IO_ERROR,
socket_io_error_from_errno (errsv),
_("Error sending message: %s"), socket_strerror (errsv));
return -1;
}
break;
}
return result;
}
#else
{
struct sockaddr_storage addr;
guint addrlen;
DWORD bytes_sent;
int result;
WSABUF *bufs;
gint i;
/* Win32 doesn't support control messages.
Actually this is possible for raw and datagram sockets
via WSASendMessage on Vista or later, but that doesn't
seem very useful */
if (num_messages != 0)
{
g_set_error_literal (error, G_IO_ERROR, G_IO_ERROR_NOT_SUPPORTED,
_("GSocketControlMessage not supported on Windows"));
return -1;
}
/* iov */
bufs = g_newa (WSABUF, num_vectors);
for (i = 0; i < num_vectors; i++)
{
bufs[i].buf = (char *)vectors[i].buffer;
bufs[i].len = (gulong)vectors[i].size;
}
/* name */
addrlen = 0; /* Avoid warning */
if (address)
{
addrlen = g_socket_address_get_native_size (address);
if (!g_socket_address_to_native (address, &addr, sizeof addr, error))
return -1;
}
while (1)
{
if (socket->priv->blocking &&
!g_socket_condition_wait (socket,
G_IO_OUT, cancellable, error))
return -1;
if (address)
result = WSASendTo (socket->priv->fd,
bufs, num_vectors,
&bytes_sent, flags,
(const struct sockaddr *)&addr, addrlen,
NULL, NULL);
else
result = WSASend (socket->priv->fd,
bufs, num_vectors,
&bytes_sent, flags,
NULL, NULL);
if (result != 0)
{
int errsv = get_socket_errno ();
if (errsv == WSAEINTR)
continue;
if (errsv == WSAEWOULDBLOCK)
win32_unset_event_mask (socket, FD_WRITE);
if (socket->priv->blocking &&
errsv == WSAEWOULDBLOCK)
continue;
g_set_error (error, G_IO_ERROR,
socket_io_error_from_errno (errsv),
_("Error sending message: %s"), socket_strerror (errsv));
return -1;
}
break;
}
return bytes_sent;
}
#endif
}
static GSocketAddress *
cache_recv_address (GSocket *socket, struct sockaddr *native, int native_len)
{
GSocketAddress *saddr;
gint i;
guint64 oldest_time = G_MAXUINT64;
gint oldest_index = 0;
if (native_len <= 0)
return NULL;
saddr = NULL;
for (i = 0; i < RECV_ADDR_CACHE_SIZE; i++)
{
GSocketAddress *tmp = socket->priv->recv_addr_cache[i].addr;
gpointer tmp_native = socket->priv->recv_addr_cache[i].native;
gint tmp_native_len = socket->priv->recv_addr_cache[i].native_len;
if (!tmp)
continue;
if (tmp_native_len != native_len)
continue;
if (memcmp (tmp_native, native, native_len) == 0)
{
saddr = g_object_ref (tmp);
socket->priv->recv_addr_cache[i].last_used = g_get_monotonic_time ();
return saddr;
}
if (socket->priv->recv_addr_cache[i].last_used < oldest_time)
{
oldest_time = socket->priv->recv_addr_cache[i].last_used;
oldest_index = i;
}
}
saddr = g_socket_address_new_from_native (native, native_len);
if (socket->priv->recv_addr_cache[oldest_index].addr)
{
g_object_unref (socket->priv->recv_addr_cache[oldest_index].addr);
g_free (socket->priv->recv_addr_cache[oldest_index].native);
}
socket->priv->recv_addr_cache[oldest_index].native = g_memdup (native, native_len);
socket->priv->recv_addr_cache[oldest_index].native_len = native_len;
socket->priv->recv_addr_cache[oldest_index].addr = g_object_ref (saddr);
socket->priv->recv_addr_cache[oldest_index].last_used = g_get_monotonic_time ();
return saddr;
}
/**
* g_socket_receive_message:
* @socket: a #GSocket
* @address: (out) (allow-none): a pointer to a #GSocketAddress
* pointer, or %NULL
* @vectors: (array length=num_vectors): an array of #GInputVector structs
* @num_vectors: the number of elements in @vectors, or -1
* @messages: (array length=num_messages) (allow-none): a pointer which
* may be filled with an array of #GSocketControlMessages, or %NULL
* @num_messages: a pointer which will be filled with the number of
* elements in @messages, or %NULL
* @flags: a pointer to an int containing #GSocketMsgFlags flags
* @cancellable: (allow-none): a %GCancellable or %NULL
* @error: a #GError pointer, or %NULL
*
* Receive data from a socket. This is the most complicated and
* fully-featured version of this call. For easier use, see
* g_socket_receive() and g_socket_receive_from().
*
* If @address is non-%NULL then @address will be set equal to the
* source address of the received packet.
* @address is owned by the caller.
*
* @vector must point to an array of #GInputVector structs and
* @num_vectors must be the length of this array. These structs
* describe the buffers that received data will be scattered into.
* If @num_vectors is -1, then @vectors is assumed to be terminated
* by a #GInputVector with a %NULL buffer pointer.
*
* As a special case, if @num_vectors is 0 (in which case, @vectors
* may of course be %NULL), then a single byte is received and
* discarded. This is to facilitate the common practice of sending a
* single '\0' byte for the purposes of transferring ancillary data.
*
* @messages, if non-%NULL, will be set to point to a newly-allocated
* array of #GSocketControlMessage instances or %NULL if no such
* messages was received. These correspond to the control messages
* received from the kernel, one #GSocketControlMessage per message
* from the kernel. This array is %NULL-terminated and must be freed
* by the caller using g_free() after calling g_object_unref() on each
* element. If @messages is %NULL, any control messages received will
* be discarded.
*
* @num_messages, if non-%NULL, will be set to the number of control
* messages received.
*
* If both @messages and @num_messages are non-%NULL, then
* @num_messages gives the number of #GSocketControlMessage instances
* in @messages (ie: not including the %NULL terminator).
*
* @flags is an in/out parameter. The commonly available arguments
* for this are available in the #GSocketMsgFlags enum, but the
* values there are the same as the system values, and the flags
* are passed in as-is, so you can pass in system-specific flags too
* (and g_socket_receive_message() may pass system-specific flags out).
*
* As with g_socket_receive(), data may be discarded if @socket is
* %G_SOCKET_TYPE_DATAGRAM or %G_SOCKET_TYPE_SEQPACKET and you do not
* provide enough buffer space to read a complete message. You can pass
* %G_SOCKET_MSG_PEEK in @flags to peek at the current message without
* removing it from the receive queue, but there is no portable way to find
* out the length of the message other than by reading it into a
* sufficiently-large buffer.
*
* If the socket is in blocking mode the call will block until there
* is some data to receive, the connection is closed, or there is an
* error. If there is no data available and the socket is in
* non-blocking mode, a %G_IO_ERROR_WOULD_BLOCK error will be
* returned. To be notified when data is available, wait for the
* %G_IO_IN condition.
*
* On error -1 is returned and @error is set accordingly.
*
* Returns: Number of bytes read, or 0 if the connection was closed by
* the peer, or -1 on error
*
* Since: 2.22
*/
gssize
g_socket_receive_message (GSocket *socket,
GSocketAddress **address,
GInputVector *vectors,
gint num_vectors,
GSocketControlMessage ***messages,
gint *num_messages,
gint *flags,
GCancellable *cancellable,
GError **error)
{
GInputVector one_vector;
char one_byte;
g_return_val_if_fail (G_IS_SOCKET (socket), -1);
if (!check_socket (socket, error))
return -1;
if (g_cancellable_set_error_if_cancelled (cancellable, error))
return -1;
if (num_vectors == -1)
{
for (num_vectors = 0;
vectors[num_vectors].buffer != NULL;
num_vectors++)
;
}
if (num_vectors == 0)
{
one_vector.buffer = &one_byte;
one_vector.size = 1;
num_vectors = 1;
vectors = &one_vector;
}
#ifndef G_OS_WIN32
{
struct msghdr msg;
gssize result;
struct sockaddr_storage one_sockaddr;
/* name */
if (address)
{
msg.msg_name = &one_sockaddr;
msg.msg_namelen = sizeof (struct sockaddr_storage);
}
else
{
msg.msg_name = NULL;
msg.msg_namelen = 0;
}
/* iov */
/* this entire expression will be evaluated at compile time */
if (sizeof *msg.msg_iov == sizeof *vectors &&
sizeof msg.msg_iov->iov_base == sizeof vectors->buffer &&
G_STRUCT_OFFSET (struct iovec, iov_base) ==
G_STRUCT_OFFSET (GInputVector, buffer) &&
sizeof msg.msg_iov->iov_len == sizeof vectors->size &&
G_STRUCT_OFFSET (struct iovec, iov_len) ==
G_STRUCT_OFFSET (GInputVector, size))
/* ABI is compatible */
{
msg.msg_iov = (struct iovec *) vectors;
msg.msg_iovlen = num_vectors;
}
else
/* ABI is incompatible */
{
gint i;
msg.msg_iov = g_newa (struct iovec, num_vectors);
for (i = 0; i < num_vectors; i++)
{
msg.msg_iov[i].iov_base = vectors[i].buffer;
msg.msg_iov[i].iov_len = vectors[i].size;
}
msg.msg_iovlen = num_vectors;
}
/* control */
msg.msg_control = g_alloca (2048);
msg.msg_controllen = 2048;
/* flags */
if (flags != NULL)
msg.msg_flags = *flags;
else
msg.msg_flags = 0;
/* We always set the close-on-exec flag so we don't leak file
* descriptors into child processes. Note that gunixfdmessage.c
* will later call fcntl (fd, FD_CLOEXEC), but that isn't atomic.
*/
#ifdef MSG_CMSG_CLOEXEC
msg.msg_flags |= MSG_CMSG_CLOEXEC;
#endif
/* do it */
while (1)
{
if (socket->priv->blocking &&
!g_socket_condition_wait (socket,
G_IO_IN, cancellable, error))
return -1;
result = recvmsg (socket->priv->fd, &msg, msg.msg_flags);
#ifdef MSG_CMSG_CLOEXEC
if (result < 0 && get_socket_errno () == EINVAL)
{
/* We must be running on an old kernel. Call without the flag. */
msg.msg_flags &= ~(MSG_CMSG_CLOEXEC);
result = recvmsg (socket->priv->fd, &msg, msg.msg_flags);
}
#endif
if (result < 0)
{
int errsv = get_socket_errno ();
if (errsv == EINTR)
continue;
if (socket->priv->blocking &&
(errsv == EWOULDBLOCK ||
errsv == EAGAIN))
continue;
g_set_error (error, G_IO_ERROR,
socket_io_error_from_errno (errsv),
_("Error receiving message: %s"), socket_strerror (errsv));
return -1;
}
break;
}
/* decode address */
if (address != NULL)
{
*address = cache_recv_address (socket, msg.msg_name, msg.msg_namelen);
}
/* decode control messages */
{
GPtrArray *my_messages = NULL;
struct cmsghdr *cmsg;
if (msg.msg_controllen >= sizeof (struct cmsghdr))
{
for (cmsg = CMSG_FIRSTHDR (&msg); cmsg; cmsg = CMSG_NXTHDR (&msg, cmsg))
{
GSocketControlMessage *message;
message = g_socket_control_message_deserialize (cmsg->cmsg_level,
cmsg->cmsg_type,
cmsg->cmsg_len - ((char *)CMSG_DATA (cmsg) - (char *)cmsg),
CMSG_DATA (cmsg));
if (message == NULL)
/* We've already spewed about the problem in the
deserialization code, so just continue */
continue;
if (messages == NULL)
{
/* we have to do it this way if the user ignores the
* messages so that we will close any received fds.
*/
g_object_unref (message);
}
else
{
if (my_messages == NULL)
my_messages = g_ptr_array_new ();
g_ptr_array_add (my_messages, message);
}
}
}
if (num_messages)
*num_messages = my_messages != NULL ? my_messages->len : 0;
if (messages)
{
if (my_messages == NULL)
{
*messages = NULL;
}
else
{
g_ptr_array_add (my_messages, NULL);
*messages = (GSocketControlMessage **) g_ptr_array_free (my_messages, FALSE);
}
}
else
{
g_assert (my_messages == NULL);
}
}
/* capture the flags */
if (flags != NULL)
*flags = msg.msg_flags;
return result;
}
#else
{
struct sockaddr_storage addr;
int addrlen;
DWORD bytes_received;
DWORD win_flags;
int result;
WSABUF *bufs;
gint i;
/* iov */
bufs = g_newa (WSABUF, num_vectors);
for (i = 0; i < num_vectors; i++)
{
bufs[i].buf = (char *)vectors[i].buffer;
bufs[i].len = (gulong)vectors[i].size;
}
/* flags */
if (flags != NULL)
win_flags = *flags;
else
win_flags = 0;
/* do it */
while (1)
{
if (socket->priv->blocking &&
!g_socket_condition_wait (socket,
G_IO_IN, cancellable, error))
return -1;
addrlen = sizeof addr;
if (address)
result = WSARecvFrom (socket->priv->fd,
bufs, num_vectors,
&bytes_received, &win_flags,
(struct sockaddr *)&addr, &addrlen,
NULL, NULL);
else
result = WSARecv (socket->priv->fd,
bufs, num_vectors,
&bytes_received, &win_flags,
NULL, NULL);
if (result != 0)
{
int errsv = get_socket_errno ();
if (errsv == WSAEINTR)
continue;
win32_unset_event_mask (socket, FD_READ);
if (socket->priv->blocking &&
errsv == WSAEWOULDBLOCK)
continue;
g_set_error (error, G_IO_ERROR,
socket_io_error_from_errno (errsv),
_("Error receiving message: %s"), socket_strerror (errsv));
return -1;
}
win32_unset_event_mask (socket, FD_READ);
break;
}
/* decode address */
if (address != NULL)
{
*address = cache_recv_address (socket, (struct sockaddr *)&addr, addrlen);
}
/* capture the flags */
if (flags != NULL)
*flags = win_flags;
if (messages != NULL)
*messages = NULL;
if (num_messages != NULL)
*num_messages = 0;
return bytes_received;
}
#endif
}
/**
* g_socket_get_credentials:
* @socket: a #GSocket.
* @error: #GError for error reporting, or %NULL to ignore.
*
* Returns the credentials of the foreign process connected to this
* socket, if any (e.g. it is only supported for %G_SOCKET_FAMILY_UNIX
* sockets).
*
* If this operation isn't supported on the OS, the method fails with
* the %G_IO_ERROR_NOT_SUPPORTED error. On Linux this is implemented
* by reading the %SO_PEERCRED option on the underlying socket.
*
* Other ways to obtain credentials from a foreign peer includes the
* #GUnixCredentialsMessage type and
* g_unix_connection_send_credentials() /
* g_unix_connection_receive_credentials() functions.
*
* Returns: (transfer full): %NULL if @error is set, otherwise a #GCredentials object
* that must be freed with g_object_unref().
*
* Since: 2.26
*/
GCredentials *
g_socket_get_credentials (GSocket *socket,
GError **error)
{
GCredentials *ret;
g_return_val_if_fail (G_IS_SOCKET (socket), NULL);
g_return_val_if_fail (error == NULL || *error == NULL, NULL);
ret = NULL;
#if defined(__linux__) || defined(__OpenBSD__)
{
socklen_t optlen;
#if defined(__linux__)
struct ucred native_creds;
optlen = sizeof (struct ucred);
#elif defined(__OpenBSD__)
struct sockpeercred native_creds;
optlen = sizeof (struct sockpeercred);
#endif
if (getsockopt (socket->priv->fd,
SOL_SOCKET,
SO_PEERCRED,
(void *)&native_creds,
&optlen) != 0)
{
int errsv = get_socket_errno ();
g_set_error (error,
G_IO_ERROR,
socket_io_error_from_errno (errsv),
_("Unable to get pending error: %s"),
socket_strerror (errsv));
}
else
{
ret = g_credentials_new ();
g_credentials_set_native (ret,
#if defined(__linux__)
G_CREDENTIALS_TYPE_LINUX_UCRED,
#elif defined(__OpenBSD__)
G_CREDENTIALS_TYPE_OPENBSD_SOCKPEERCRED,
#endif
&native_creds);
}
}
#else
g_set_error_literal (error,
G_IO_ERROR,
G_IO_ERROR_NOT_SUPPORTED,
_("g_socket_get_credentials not implemented for this OS"));
#endif
return ret;
}
/**
* g_socket_get_option:
* @socket: a #GSocket
* @level: the "API level" of the option (eg, <literal>SOL_SOCKET</literal>)
* @optname: the "name" of the option (eg, <literal>SO_BROADCAST</literal>)
* @value: (out): return location for the option value
* @error: #GError for error reporting, or %NULL to ignore.
*
* Gets the value of an integer-valued option on @socket, as with
* <literal>getsockopt ()</literal>. (If you need to fetch a
* non-integer-valued option, you will need to call
* <literal>getsockopt ()</literal> directly.)
*
* The <link linkend="gio-gnetworking.h"><literal>&lt;gio/gnetworking.h&gt;</literal></link>
* header pulls in system headers that will define most of the
* standard/portable socket options. For unusual socket protocols or
* platform-dependent options, you may need to include additional
* headers.
*
* Note that even for socket options that are a single byte in size,
* @value is still a pointer to a #gint variable, not a #guchar;
* g_socket_get_option() will handle the conversion internally.
*
* Returns: success or failure. On failure, @error will be set, and
* the system error value (<literal>errno</literal> or
* <literal>WSAGetLastError ()</literal>) will still be set to the
* result of the <literal>getsockopt ()</literal> call.
*
* Since: 2.36
*/
gboolean
g_socket_get_option (GSocket *socket,
gint level,
gint optname,
gint *value,
GError **error)
{
guint size;
g_return_val_if_fail (G_IS_SOCKET (socket), FALSE);
*value = 0;
size = sizeof (gint);
if (getsockopt (socket->priv->fd, level, optname, value, &size) != 0)
{
int errsv = get_socket_errno ();
g_set_error_literal (error,
G_IO_ERROR,
socket_io_error_from_errno (errsv),
socket_strerror (errsv));
#ifndef G_OS_WIN32
/* Reset errno in case the caller wants to look at it */
errno = errsv;
#endif
return FALSE;
}
#if G_BYTE_ORDER == G_BIG_ENDIAN
/* If the returned value is smaller than an int then we need to
* slide it over into the low-order bytes of *value.
*/
if (size != sizeof (gint))
*value = *value >> (8 * (sizeof (gint) - size));
#endif
return TRUE;
}
/**
* g_socket_set_option:
* @socket: a #GSocket
* @level: the "API level" of the option (eg, <literal>SOL_SOCKET</literal>)
* @optname: the "name" of the option (eg, <literal>SO_BROADCAST</literal>)
* @value: the value to set the option to
* @error: #GError for error reporting, or %NULL to ignore.
*
* Sets the value of an integer-valued option on @socket, as with
* <literal>setsockopt ()</literal>. (If you need to set a
* non-integer-valued option, you will need to call
* <literal>setsockopt ()</literal> directly.)
*
* The <link linkend="gio-gnetworking.h"><literal>&lt;gio/gnetworking.h&gt;</literal></link>
* header pulls in system headers that will define most of the
* standard/portable socket options. For unusual socket protocols or
* platform-dependent options, you may need to include additional
* headers.
*
* Returns: success or failure. On failure, @error will be set, and
* the system error value (<literal>errno</literal> or
* <literal>WSAGetLastError ()</literal>) will still be set to the
* result of the <literal>setsockopt ()</literal> call.
*
* Since: 2.36
*/
gboolean
g_socket_set_option (GSocket *socket,
gint level,
gint optname,
gint value,
GError **error)
{
gint errsv;
g_return_val_if_fail (G_IS_SOCKET (socket), FALSE);
if (setsockopt (socket->priv->fd, level, optname, &value, sizeof (gint)) == 0)
return TRUE;
#if !defined (__linux__) && !defined (G_OS_WIN32)
/* Linux and Windows let you set a single-byte value from an int,
* but most other platforms don't.
*/
if (errno == EINVAL && value >= SCHAR_MIN && value <= CHAR_MAX)
{
#if G_BYTE_ORDER == G_BIG_ENDIAN
value = value << (8 * (sizeof (gint) - 1));
#endif
if (setsockopt (socket->priv->fd, level, optname, &value, 1) == 0)
return TRUE;
}
#endif
errsv = get_socket_errno ();
g_set_error_literal (error,
G_IO_ERROR,
socket_io_error_from_errno (errsv),
socket_strerror (errsv));
#ifndef G_OS_WIN32
errno = errsv;
#endif
return FALSE;
}
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