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53beca955e
Currently, to implement cancellability correctly, all synchronous calls to GSocket must be preceded by a g_socket_condition_wait() call, (even though GSocket does this internally as well) and all asynchronous calls must do occasional manual g_cancellable_is_cancelled() checks. Since it's trivial to do these checks inside GSocket instead, and we don't particularly want to encourage people to use the APIs non-cancellably, move the cancellation support into GSocket and simplify the existing callers. http://bugzilla.gnome.org/show_bug.cgi?id=586797
292 lines
12 KiB
C
292 lines
12 KiB
C
/* GIO - GLib Input, Output and Streaming Library
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*
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* Copyright © 2009 Codethink Limited
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published
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* by the Free Software Foundation; either version 2 of the licence or (at
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* your option) any later version.
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*
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* See the included COPYING file for more information.
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*
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* Authors: Ryan Lortie <desrt@desrt.ca>
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*/
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#include "config.h"
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#include "gunixconnection.h"
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#include "glibintl.h"
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/**
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* SECTION: gunixconnection
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* @title: GUnixConnection
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* @short_description: a Unix domain #GSocketConnection
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* @see_also: #GSocketConnection.
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*
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* This is the subclass of #GSocketConnection that is created
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* for UNIX domain sockets.
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*
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* It contains functions to do some of the unix socket specific
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* functionallity like passing file descriptors.
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*
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* Since: 2.22
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*/
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#include <gio/gsocketcontrolmessage.h>
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#include <gio/gunixfdmessage.h>
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#include <gio/gsocket.h>
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#include <unistd.h>
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#include "gioalias.h"
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G_DEFINE_TYPE_WITH_CODE (GUnixConnection, g_unix_connection,
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G_TYPE_SOCKET_CONNECTION,
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g_socket_connection_factory_register_type (g_define_type_id,
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G_SOCKET_FAMILY_UNIX,
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G_SOCKET_TYPE_STREAM,
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G_SOCKET_PROTOCOL_DEFAULT);
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);
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/**
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* g_unix_connection_send_fd:
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* @connection: a #GUnixConnection
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* @fd: a file descriptor
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* @cancellable: optional #GCancellable object, %NULL to ignore.
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* @error: #GError for error reporting, or %NULL to ignore.
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*
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* Passes a file descriptor to the recieving side of the
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* connection. The recieving end has to call g_unix_connection_receive_fd()
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* to accept the file descriptor.
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*
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* As well as sending the fd this also writes a single byte to the
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* stream, as this is required for fd passing to work on some
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* implementations.
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*
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* Returns: a %TRUE on success, %NULL on error.
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*
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* Since: 2.22
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*/
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gboolean
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g_unix_connection_send_fd (GUnixConnection *connection,
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gint fd,
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GCancellable *cancellable,
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GError **error)
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{
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GSocketControlMessage *scm;
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GSocket *socket;
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g_return_val_if_fail (G_IS_UNIX_CONNECTION (connection), FALSE);
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g_return_val_if_fail (fd >= 0, FALSE);
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scm = g_unix_fd_message_new ();
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if (!g_unix_fd_message_append_fd (G_UNIX_FD_MESSAGE (scm), fd, error))
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{
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g_object_unref (scm);
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return FALSE;
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}
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g_object_get (connection, "socket", &socket, NULL);
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if (g_socket_send_message (socket, NULL, NULL, 0, &scm, 1, 0, cancellable, error) != 1)
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/* XXX could it 'fail' with zero? */
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{
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g_object_unref (socket);
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g_object_unref (scm);
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return FALSE;
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}
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g_object_unref (socket);
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g_object_unref (scm);
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return TRUE;
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}
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/**
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* g_unix_connection_receive_fd:
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* @connection: a #GUnixConnection
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* @cancellable: optional #GCancellable object, %NULL to ignore
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* @error: #GError for error reporting, or %NULL to ignore
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*
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* Receives a file descriptor from the sending end of the connection.
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* The sending end has to call g_unix_connection_send_fd() for this
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* to work.
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*
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* As well as reading the fd this also reads a single byte from the
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* stream, as this is required for fd passing to work on some
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* implementations.
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*
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* Returns: a file descriptor on success, -1 on error.
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*
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* Since: 2.22
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*/
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gint
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g_unix_connection_receive_fd (GUnixConnection *connection,
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GCancellable *cancellable,
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GError **error)
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{
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GSocketControlMessage **scms;
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gint *fds, nfd, fd, nscm;
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GUnixFDMessage *fdmsg;
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GSocket *socket;
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g_return_val_if_fail (G_IS_UNIX_CONNECTION (connection), -1);
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g_object_get (connection, "socket", &socket, NULL);
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if (g_socket_receive_message (socket, NULL, NULL, 0,
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&scms, &nscm, NULL, cancellable, error) != 1)
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/* XXX it _could_ 'fail' with zero. */
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{
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g_object_unref (socket);
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return -1;
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}
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g_object_unref (socket);
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if (nscm != 1)
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{
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gint i;
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g_set_error (error, G_IO_ERROR, G_IO_ERROR_FAILED,
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_("Expecting 1 control message, got %d"), nscm);
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for (i = 0; i < nscm; i++)
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g_object_unref (scms[i]);
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g_free (scms);
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return -1;
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}
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if (!G_IS_UNIX_FD_MESSAGE (scms[0]))
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{
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g_set_error_literal (error, G_IO_ERROR, G_IO_ERROR_FAILED,
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_("Unexpected type of ancillary data"));
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g_object_unref (scms[0]);
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g_free (scms);
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return -1;
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}
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fdmsg = G_UNIX_FD_MESSAGE (scms[0]);
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g_free (scms);
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fds = g_unix_fd_message_steal_fds (fdmsg, &nfd);
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g_object_unref (fdmsg);
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if (nfd != 1)
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{
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gint i;
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g_set_error (error, G_IO_ERROR, G_IO_ERROR_FAILED,
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_("Expecting one fd, but got %d\n"), nfd);
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for (i = 0; i < nfd; i++)
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close (fds[i]);
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g_free (fds);
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return -1;
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}
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fd = *fds;
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g_free (fds);
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if (fd < 0)
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{
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g_set_error_literal (error, G_IO_ERROR, G_IO_ERROR_FAILED,
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_("Received invalid fd"));
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fd = -1;
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}
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return fd;
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}
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static void
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g_unix_connection_init (GUnixConnection *connection)
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{
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}
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static void
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g_unix_connection_class_init (GUnixConnectionClass *class)
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{
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}
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/* TODO: Other stuff we might want to add are:
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void g_unix_connection_send_fd_async (GUnixConnection *connection,
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gint fd,
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gboolean close,
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gint io_priority,
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GAsyncReadyCallback callback,
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gpointer user_data);
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gboolean g_unix_connection_send_fd_finish (GUnixConnection *connection,
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GError **error);
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gboolean g_unix_connection_send_fds (GUnixConnection *connection,
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gint *fds,
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gint nfds,
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GError **error);
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void g_unix_connection_send_fds_async (GUnixConnection *connection,
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gint *fds,
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gint nfds,
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gint io_priority,
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GAsyncReadyCallback callback,
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gpointer user_data);
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gboolean g_unix_connection_send_fds_finish (GUnixConnection *connection,
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GError **error);
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void g_unix_connection_receive_fd_async (GUnixConnection *connection,
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gint io_priority,
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GAsyncReadyCallback callback,
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gpointer user_data);
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gint g_unix_connection_receive_fd_finish (GUnixConnection *connection,
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GError **error);
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gboolean g_unix_connection_send_credentials (GUnixConnection *connection,
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GError **error);
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void g_unix_connection_send_credentials_async (GUnixConnection *connection,
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gint io_priority,
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GAsyncReadyCallback callback,
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gpointer user_data);
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gboolean g_unix_connection_send_credentials_finish (GUnixConnection *connection,
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GError **error);
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gboolean g_unix_connection_send_fake_credentials (GUnixConnection *connection,
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guint64 pid,
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guint64 uid,
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guint64 gid,
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GError **error);
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void g_unix_connection_send_fake_credentials_async (GUnixConnection *connection,
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guint64 pid,
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guint64 uid,
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guint64 gid,
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gint io_priority,
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GAsyncReadyCallback callback,
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gpointer user_data);
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gboolean g_unix_connection_send_fake_credentials_finish (GUnixConnection *connection,
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GError **error);
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gboolean g_unix_connection_receive_credentials (GUnixConnection *connection,
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guint64 *pid,
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guint64 *uid,
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guint64 *gid,
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GError **error);
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void g_unix_connection_receive_credentials_async (GUnixConnection *connection,
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gint io_priority,
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GAsyncReadyCallback callback,
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gpointer user_data);
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gboolean g_unix_connection_receive_credentials_finish (GUnixConnection *connection,
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guint64 *pid,
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guint64 *uid,
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guint64 *gid,
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GError **error);
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gboolean g_unix_connection_create_pair (GUnixConnection **one,
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GUnixConnection **two,
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GError **error);
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*/
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#define __G_UNIX_CONNECTION_C__
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#include "gioaliasdef.c"
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