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glib/gio/gunixinputstream.c
John Ralls b65dac802e Fix poll able streams for Darwin (and probably BSD) 
Darwin's poll doesn't change revents if there are no available events, though it returns 0. Initialize the fd.revents to 0 so that the test passes.

That reveals a test failure, though, because with socket streams it takes time for an event to pass through the socket. Provide an 80-usec delay to allow time for the propagation.
2012-11-09 09:23:01 -08:00

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/* GIO - GLib Input, Output and Streaming Library
*
* Copyright (C) 2006-2007 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.
*
* Author: Alexander Larsson <alexl@redhat.com>
*/
#include "config.h"
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <errno.h>
#include <stdio.h>
#include <fcntl.h>
#include <glib.h>
#include <glib/gstdio.h>
#include "gioerror.h"
#include "gsimpleasyncresult.h"
#include "gunixinputstream.h"
#include "gcancellable.h"
#include "gasynchelper.h"
#include "gfiledescriptorbased.h"
#include "glibintl.h"
/**
* SECTION:gunixinputstream
* @short_description: Streaming input operations for UNIX file descriptors
* @include: gio/gunixinputstream.h
* @see_also: #GInputStream
*
* #GUnixInputStream implements #GInputStream for reading from a UNIX
* file descriptor, including asynchronous operations. (If the file
* descriptor refers to a socket or pipe, this will use poll() to do
* asynchronous I/O. If it refers to a regular file, it will fall back
* to doing asynchronous I/O in another thread.)
*
* Note that <filename>&lt;gio/gunixinputstream.h&gt;</filename> belongs
* to the UNIX-specific GIO interfaces, thus you have to use the
* <filename>gio-unix-2.0.pc</filename> pkg-config file when using it.
*/
enum {
PROP_0,
PROP_FD,
PROP_CLOSE_FD
};
static void g_unix_input_stream_pollable_iface_init (GPollableInputStreamInterface *iface);
static void g_unix_input_stream_file_descriptor_based_iface_init (GFileDescriptorBasedIface *iface);
G_DEFINE_TYPE_WITH_CODE (GUnixInputStream, g_unix_input_stream, G_TYPE_INPUT_STREAM,
G_IMPLEMENT_INTERFACE (G_TYPE_POLLABLE_INPUT_STREAM,
g_unix_input_stream_pollable_iface_init)
G_IMPLEMENT_INTERFACE (G_TYPE_FILE_DESCRIPTOR_BASED,
g_unix_input_stream_file_descriptor_based_iface_init)
)
struct _GUnixInputStreamPrivate {
int fd;
guint close_fd : 1;
guint is_pipe_or_socket : 1;
};
static void g_unix_input_stream_set_property (GObject *object,
guint prop_id,
const GValue *value,
GParamSpec *pspec);
static void g_unix_input_stream_get_property (GObject *object,
guint prop_id,
GValue *value,
GParamSpec *pspec);
static gssize g_unix_input_stream_read (GInputStream *stream,
void *buffer,
gsize count,
GCancellable *cancellable,
GError **error);
static gboolean g_unix_input_stream_close (GInputStream *stream,
GCancellable *cancellable,
GError **error);
static void g_unix_input_stream_skip_async (GInputStream *stream,
gsize count,
int io_priority,
GCancellable *cancellable,
GAsyncReadyCallback callback,
gpointer data);
static gssize g_unix_input_stream_skip_finish (GInputStream *stream,
GAsyncResult *result,
GError **error);
static void g_unix_input_stream_close_async (GInputStream *stream,
int io_priority,
GCancellable *cancellable,
GAsyncReadyCallback callback,
gpointer data);
static gboolean g_unix_input_stream_close_finish (GInputStream *stream,
GAsyncResult *result,
GError **error);
static gboolean g_unix_input_stream_pollable_can_poll (GPollableInputStream *stream);
static gboolean g_unix_input_stream_pollable_is_readable (GPollableInputStream *stream);
static GSource *g_unix_input_stream_pollable_create_source (GPollableInputStream *stream,
GCancellable *cancellable);
static void
g_unix_input_stream_finalize (GObject *object)
{
G_OBJECT_CLASS (g_unix_input_stream_parent_class)->finalize (object);
}
static void
g_unix_input_stream_class_init (GUnixInputStreamClass *klass)
{
GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
GInputStreamClass *stream_class = G_INPUT_STREAM_CLASS (klass);
g_type_class_add_private (klass, sizeof (GUnixInputStreamPrivate));
gobject_class->get_property = g_unix_input_stream_get_property;
gobject_class->set_property = g_unix_input_stream_set_property;
gobject_class->finalize = g_unix_input_stream_finalize;
stream_class->read_fn = g_unix_input_stream_read;
stream_class->close_fn = g_unix_input_stream_close;
if (0)
{
/* TODO: Implement instead of using fallbacks */
stream_class->skip_async = g_unix_input_stream_skip_async;
stream_class->skip_finish = g_unix_input_stream_skip_finish;
}
stream_class->close_async = g_unix_input_stream_close_async;
stream_class->close_finish = g_unix_input_stream_close_finish;
/**
* GUnixInputStream:fd:
*
* The file descriptor that the stream reads from.
*
* Since: 2.20
*/
g_object_class_install_property (gobject_class,
PROP_FD,
g_param_spec_int ("fd",
P_("File descriptor"),
P_("The file descriptor to read from"),
G_MININT, G_MAXINT, -1,
G_PARAM_READABLE | G_PARAM_WRITABLE | G_PARAM_CONSTRUCT_ONLY | G_PARAM_STATIC_NAME | G_PARAM_STATIC_NICK | G_PARAM_STATIC_BLURB));
/**
* GUnixInputStream:close-fd:
*
* Whether to close the file descriptor when the stream is closed.
*
* Since: 2.20
*/
g_object_class_install_property (gobject_class,
PROP_CLOSE_FD,
g_param_spec_boolean ("close-fd",
P_("Close file descriptor"),
P_("Whether to close the file descriptor when the stream is closed"),
TRUE,
G_PARAM_READABLE | G_PARAM_WRITABLE | G_PARAM_STATIC_NAME | G_PARAM_STATIC_NICK | G_PARAM_STATIC_BLURB));
}
static void
g_unix_input_stream_pollable_iface_init (GPollableInputStreamInterface *iface)
{
iface->can_poll = g_unix_input_stream_pollable_can_poll;
iface->is_readable = g_unix_input_stream_pollable_is_readable;
iface->create_source = g_unix_input_stream_pollable_create_source;
}
static void
g_unix_input_stream_file_descriptor_based_iface_init (GFileDescriptorBasedIface *iface)
{
iface->get_fd = (int (*) (GFileDescriptorBased *))g_unix_input_stream_get_fd;
}
static void
g_unix_input_stream_set_property (GObject *object,
guint prop_id,
const GValue *value,
GParamSpec *pspec)
{
GUnixInputStream *unix_stream;
unix_stream = G_UNIX_INPUT_STREAM (object);
switch (prop_id)
{
case PROP_FD:
unix_stream->priv->fd = g_value_get_int (value);
if (lseek (unix_stream->priv->fd, 0, SEEK_CUR) == -1 && errno == ESPIPE)
unix_stream->priv->is_pipe_or_socket = TRUE;
else
unix_stream->priv->is_pipe_or_socket = FALSE;
break;
case PROP_CLOSE_FD:
unix_stream->priv->close_fd = g_value_get_boolean (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
g_unix_input_stream_get_property (GObject *object,
guint prop_id,
GValue *value,
GParamSpec *pspec)
{
GUnixInputStream *unix_stream;
unix_stream = G_UNIX_INPUT_STREAM (object);
switch (prop_id)
{
case PROP_FD:
g_value_set_int (value, unix_stream->priv->fd);
break;
case PROP_CLOSE_FD:
g_value_set_boolean (value, unix_stream->priv->close_fd);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
}
}
static void
g_unix_input_stream_init (GUnixInputStream *unix_stream)
{
unix_stream->priv = G_TYPE_INSTANCE_GET_PRIVATE (unix_stream,
G_TYPE_UNIX_INPUT_STREAM,
GUnixInputStreamPrivate);
unix_stream->priv->fd = -1;
unix_stream->priv->close_fd = TRUE;
}
/**
* g_unix_input_stream_new:
* @fd: a UNIX file descriptor
* @close_fd: %TRUE to close the file descriptor when done
*
* Creates a new #GUnixInputStream for the given @fd.
*
* If @close_fd is %TRUE, the file descriptor will be closed
* when the stream is closed.
*
* Returns: a new #GUnixInputStream
**/
GInputStream *
g_unix_input_stream_new (gint fd,
gboolean close_fd)
{
GUnixInputStream *stream;
g_return_val_if_fail (fd != -1, NULL);
stream = g_object_new (G_TYPE_UNIX_INPUT_STREAM,
"fd", fd,
"close-fd", close_fd,
NULL);
return G_INPUT_STREAM (stream);
}
/**
* g_unix_input_stream_set_close_fd:
* @stream: a #GUnixInputStream
* @close_fd: %TRUE to close the file descriptor when done
*
* Sets whether the file descriptor of @stream shall be closed
* when the stream is closed.
*
* Since: 2.20
*/
void
g_unix_input_stream_set_close_fd (GUnixInputStream *stream,
gboolean close_fd)
{
g_return_if_fail (G_IS_UNIX_INPUT_STREAM (stream));
close_fd = close_fd != FALSE;
if (stream->priv->close_fd != close_fd)
{
stream->priv->close_fd = close_fd;
g_object_notify (G_OBJECT (stream), "close-fd");
}
}
/**
* g_unix_input_stream_get_close_fd:
* @stream: a #GUnixInputStream
*
* Returns whether the file descriptor of @stream will be
* closed when the stream is closed.
*
* Return value: %TRUE if the file descriptor is closed when done
*
* Since: 2.20
*/
gboolean
g_unix_input_stream_get_close_fd (GUnixInputStream *stream)
{
g_return_val_if_fail (G_IS_UNIX_INPUT_STREAM (stream), FALSE);
return stream->priv->close_fd;
}
/**
* g_unix_input_stream_get_fd:
* @stream: a #GUnixInputStream
*
* Return the UNIX file descriptor that the stream reads from.
*
* Return value: The file descriptor of @stream
*
* Since: 2.20
*/
gint
g_unix_input_stream_get_fd (GUnixInputStream *stream)
{
g_return_val_if_fail (G_IS_UNIX_INPUT_STREAM (stream), -1);
return stream->priv->fd;
}
static gssize
g_unix_input_stream_read (GInputStream *stream,
void *buffer,
gsize count,
GCancellable *cancellable,
GError **error)
{
GUnixInputStream *unix_stream;
gssize res = -1;
GPollFD poll_fds[2];
int nfds;
int poll_ret;
unix_stream = G_UNIX_INPUT_STREAM (stream);
poll_fds[0].fd = unix_stream->priv->fd;
poll_fds[0].events = G_IO_IN;
if (unix_stream->priv->is_pipe_or_socket &&
g_cancellable_make_pollfd (cancellable, &poll_fds[1]))
nfds = 2;
else
nfds = 1;
while (1)
{
poll_fds[0].revents = poll_fds[1].revents = 0;
do
poll_ret = g_poll (poll_fds, nfds, -1);
while (poll_ret == -1 && errno == EINTR);
if (poll_ret == -1)
{
int errsv = errno;
g_set_error (error, G_IO_ERROR,
g_io_error_from_errno (errsv),
_("Error reading from file descriptor: %s"),
g_strerror (errsv));
break;
}
if (g_cancellable_set_error_if_cancelled (cancellable, error))
break;
if (!poll_fds[0].revents)
continue;
res = read (unix_stream->priv->fd, buffer, count);
if (res == -1)
{
int errsv = errno;
if (errsv == EINTR || errsv == EAGAIN)
continue;
g_set_error (error, G_IO_ERROR,
g_io_error_from_errno (errsv),
_("Error reading from file descriptor: %s"),
g_strerror (errsv));
}
break;
}
if (nfds == 2)
g_cancellable_release_fd (cancellable);
return res;
}
static gboolean
g_unix_input_stream_close (GInputStream *stream,
GCancellable *cancellable,
GError **error)
{
GUnixInputStream *unix_stream;
int res;
unix_stream = G_UNIX_INPUT_STREAM (stream);
if (!unix_stream->priv->close_fd)
return TRUE;
while (1)
{
/* This might block during the close. Doesn't seem to be a way to avoid it though. */
res = close (unix_stream->priv->fd);
if (res == -1)
{
int errsv = errno;
g_set_error (error, G_IO_ERROR,
g_io_error_from_errno (errsv),
_("Error closing file descriptor: %s"),
g_strerror (errsv));
}
break;
}
return res != -1;
}
static void
g_unix_input_stream_skip_async (GInputStream *stream,
gsize count,
int io_priority,
GCancellable *cancellable,
GAsyncReadyCallback callback,
gpointer data)
{
g_warn_if_reached ();
/* TODO: Not implemented */
}
static gssize
g_unix_input_stream_skip_finish (GInputStream *stream,
GAsyncResult *result,
GError **error)
{
g_warn_if_reached ();
return 0;
/* TODO: Not implemented */
}
typedef struct {
GInputStream *stream;
GAsyncReadyCallback callback;
gpointer user_data;
} CloseAsyncData;
static void
close_async_data_free (gpointer _data)
{
CloseAsyncData *data = _data;
g_free (data);
}
static gboolean
close_async_cb (CloseAsyncData *data)
{
GUnixInputStream *unix_stream;
GSimpleAsyncResult *simple;
GError *error = NULL;
gboolean result;
int res;
unix_stream = G_UNIX_INPUT_STREAM (data->stream);
if (!unix_stream->priv->close_fd)
{
result = TRUE;
goto out;
}
while (1)
{
res = close (unix_stream->priv->fd);
if (res == -1)
{
int errsv = errno;
g_set_error (&error, G_IO_ERROR,
g_io_error_from_errno (errsv),
_("Error closing file descriptor: %s"),
g_strerror (errsv));
}
break;
}
result = res != -1;
out:
simple = g_simple_async_result_new (G_OBJECT (data->stream),
data->callback,
data->user_data,
g_unix_input_stream_close_async);
if (!result)
g_simple_async_result_take_error (simple, error);
/* Complete immediately, not in idle, since we're already in a mainloop callout */
g_simple_async_result_complete (simple);
g_object_unref (simple);
return FALSE;
}
static void
g_unix_input_stream_close_async (GInputStream *stream,
int io_priority,
GCancellable *cancellable,
GAsyncReadyCallback callback,
gpointer user_data)
{
GSource *idle;
CloseAsyncData *data;
data = g_new0 (CloseAsyncData, 1);
data->stream = stream;
data->callback = callback;
data->user_data = user_data;
idle = g_idle_source_new ();
g_source_set_callback (idle, (GSourceFunc)close_async_cb, data, close_async_data_free);
g_source_attach (idle, g_main_context_get_thread_default ());
g_source_unref (idle);
}
static gboolean
g_unix_input_stream_close_finish (GInputStream *stream,
GAsyncResult *result,
GError **error)
{
/* Failures handled in generic close_finish code */
return TRUE;
}
static gboolean
g_unix_input_stream_pollable_can_poll (GPollableInputStream *stream)
{
return G_UNIX_INPUT_STREAM (stream)->priv->is_pipe_or_socket;
}
static gboolean
g_unix_input_stream_pollable_is_readable (GPollableInputStream *stream)
{
GUnixInputStream *unix_stream = G_UNIX_INPUT_STREAM (stream);
GPollFD poll_fd;
gint result;
poll_fd.fd = unix_stream->priv->fd;
poll_fd.events = G_IO_IN;
poll_fd.revents = 0;
do
result = g_poll (&poll_fd, 1, 0);
while (result == -1 && errno == EINTR);
return poll_fd.revents != 0;
}
static GSource *
g_unix_input_stream_pollable_create_source (GPollableInputStream *stream,
GCancellable *cancellable)
{
GUnixInputStream *unix_stream = G_UNIX_INPUT_STREAM (stream);
GSource *inner_source, *pollable_source;
pollable_source = g_pollable_source_new (G_OBJECT (stream));
inner_source = _g_fd_source_new (unix_stream->priv->fd, G_IO_IN, cancellable);
g_source_set_dummy_callback (inner_source);
g_source_add_child_source (pollable_source, inner_source);
g_source_unref (inner_source);
return pollable_source;
}
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