1 /* GIO - GLib Input, Output and Streaming Library
3 * Copyright (C) 2008 Christian Kellner, Samuel Cormier-Iijima
4 * Copyright © 2009 Codethink Limited
5 * Copyright © 2009 Red Hat, Inc
7 * This library is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2 of the License, or (at your option) any later version.
12 * This library is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General
18 * Public License along with this library; if not, write to the
19 * Free Software Foundation, Inc., 59 Temple Place, Suite 330,
20 * Boston, MA 02111-1307, USA.
22 * Authors: Christian Kellner <gicmo@gnome.org>
23 * Samuel Cormier-Iijima <sciyoshi@gmail.com>
24 * Ryan Lortie <desrt@desrt.ca>
25 * Alexander Larsson <alexl@redhat.com>
33 #include "glib-unix.h"
44 # include <sys/ioctl.h>
51 #include "gcancellable.h"
52 #include "gioenumtypes.h"
53 #include "ginetaddress.h"
54 #include "ginitable.h"
58 #include "gnetworkingprivate.h"
59 #include "gsocketaddress.h"
60 #include "gsocketcontrolmessage.h"
61 #include "gcredentials.h"
66 * @short_description: Low-level socket object
68 * @see_also: #GInitable
70 * A #GSocket is a low-level networking primitive. It is a more or less
71 * direct mapping of the BSD socket API in a portable GObject based API.
72 * It supports both the UNIX socket implementations and winsock2 on Windows.
74 * #GSocket is the platform independent base upon which the higher level
75 * network primitives are based. Applications are not typically meant to
76 * use it directly, but rather through classes like #GSocketClient,
77 * #GSocketService and #GSocketConnection. However there may be cases where
78 * direct use of #GSocket is useful.
80 * #GSocket implements the #GInitable interface, so if it is manually constructed
81 * by e.g. g_object_new() you must call g_initable_init() and check the
82 * results before using the object. This is done automatically in
83 * g_socket_new() and g_socket_new_from_fd(), so these functions can return
86 * Sockets operate in two general modes, blocking or non-blocking. When
87 * in blocking mode all operations block until the requested operation
88 * is finished or there is an error. In non-blocking mode all calls that
89 * would block return immediately with a %G_IO_ERROR_WOULD_BLOCK error.
90 * To know when a call would successfully run you can call g_socket_condition_check(),
91 * or g_socket_condition_wait(). You can also use g_socket_create_source() and
92 * attach it to a #GMainContext to get callbacks when I/O is possible.
93 * Note that all sockets are always set to non blocking mode in the system, and
94 * blocking mode is emulated in GSocket.
96 * When working in non-blocking mode applications should always be able to
97 * handle getting a %G_IO_ERROR_WOULD_BLOCK error even when some other
98 * function said that I/O was possible. This can easily happen in case
99 * of a race condition in the application, but it can also happen for other
100 * reasons. For instance, on Windows a socket is always seen as writable
101 * until a write returns %G_IO_ERROR_WOULD_BLOCK.
103 * #GSocket<!-- -->s can be either connection oriented or datagram based.
104 * For connection oriented types you must first establish a connection by
105 * either connecting to an address or accepting a connection from another
106 * address. For connectionless socket types the target/source address is
107 * specified or received in each I/O operation.
109 * All socket file descriptors are set to be close-on-exec.
111 * Note that creating a #GSocket causes the signal %SIGPIPE to be
112 * ignored for the remainder of the program. If you are writing a
113 * command-line utility that uses #GSocket, you may need to take into
114 * account the fact that your program will not automatically be killed
115 * if it tries to write to %stdout after it has been closed.
120 static void g_socket_initable_iface_init (GInitableIface *iface);
121 static gboolean g_socket_initable_init (GInitable *initable,
122 GCancellable *cancellable,
125 G_DEFINE_TYPE_WITH_CODE (GSocket, g_socket, G_TYPE_OBJECT,
126 G_IMPLEMENT_INTERFACE (G_TYPE_INITABLE,
127 g_socket_initable_iface_init));
144 PROP_MULTICAST_LOOPBACK,
148 struct _GSocketPrivate
150 GSocketFamily family;
152 GSocketProtocol protocol;
156 GError *construct_error;
157 GSocketAddress *remote_address;
165 guint connect_pending : 1;
171 GList *requested_conditions; /* list of requested GIOCondition * */
176 get_socket_errno (void)
181 return WSAGetLastError ();
186 socket_io_error_from_errno (int err)
189 return g_io_error_from_errno (err);
194 return G_IO_ERROR_ADDRESS_IN_USE;
196 return G_IO_ERROR_WOULD_BLOCK;
198 return G_IO_ERROR_PERMISSION_DENIED;
199 case WSA_INVALID_HANDLE:
200 case WSA_INVALID_PARAMETER:
203 return G_IO_ERROR_INVALID_ARGUMENT;
204 case WSAEPROTONOSUPPORT:
205 return G_IO_ERROR_NOT_SUPPORTED;
207 return G_IO_ERROR_CANCELLED;
208 case WSAESOCKTNOSUPPORT:
210 case WSAEPFNOSUPPORT:
211 case WSAEAFNOSUPPORT:
212 return G_IO_ERROR_NOT_SUPPORTED;
214 return G_IO_ERROR_FAILED;
220 socket_strerror (int err)
223 return g_strerror (err);
228 msg = g_win32_error_message (err);
230 msg_ret = g_intern_string (msg);
238 #define win32_unset_event_mask(_socket, _mask) _win32_unset_event_mask (_socket, _mask)
240 _win32_unset_event_mask (GSocket *socket, int mask)
242 socket->priv->current_events &= ~mask;
243 socket->priv->current_errors &= ~mask;
246 #define win32_unset_event_mask(_socket, _mask)
250 set_fd_nonblocking (int fd)
253 GError *error = NULL;
259 if (!g_unix_set_fd_nonblocking (fd, TRUE, &error))
261 g_warning ("Error setting socket nonblocking: %s", error->message);
262 g_clear_error (&error);
267 if (ioctlsocket (fd, FIONBIO, &arg) == SOCKET_ERROR)
269 int errsv = get_socket_errno ();
270 g_warning ("Error setting socket status flags: %s", socket_strerror (errsv));
276 check_socket (GSocket *socket,
279 if (!socket->priv->inited)
281 g_set_error_literal (error, G_IO_ERROR, G_IO_ERROR_NOT_INITIALIZED,
282 _("Invalid socket, not initialized"));
286 if (socket->priv->construct_error)
288 g_set_error (error, G_IO_ERROR, G_IO_ERROR_NOT_INITIALIZED,
289 _("Invalid socket, initialization failed due to: %s"),
290 socket->priv->construct_error->message);
294 if (socket->priv->closed)
296 g_set_error_literal (error, G_IO_ERROR, G_IO_ERROR_CLOSED,
297 _("Socket is already closed"));
301 if (socket->priv->timed_out)
303 socket->priv->timed_out = FALSE;
304 g_set_error_literal (error, G_IO_ERROR, G_IO_ERROR_TIMED_OUT,
305 _("Socket I/O timed out"));
313 g_socket_details_from_fd (GSocket *socket)
315 struct sockaddr_storage address;
322 /* See bug #611756 */
323 BOOL bool_val = FALSE;
328 fd = socket->priv->fd;
329 optlen = sizeof value;
330 if (getsockopt (fd, SOL_SOCKET, SO_TYPE, (void *)&value, &optlen) != 0)
332 errsv = get_socket_errno ();
344 /* programmer error */
345 g_error ("creating GSocket from fd %d: %s\n",
346 fd, socket_strerror (errsv));
354 g_assert (optlen == sizeof value);
358 socket->priv->type = G_SOCKET_TYPE_STREAM;
362 socket->priv->type = G_SOCKET_TYPE_DATAGRAM;
366 socket->priv->type = G_SOCKET_TYPE_SEQPACKET;
370 socket->priv->type = G_SOCKET_TYPE_INVALID;
374 addrlen = sizeof address;
375 if (getsockname (fd, (struct sockaddr *) &address, &addrlen) != 0)
377 errsv = get_socket_errno ();
383 g_assert (G_STRUCT_OFFSET (struct sockaddr, sa_family) +
384 sizeof address.ss_family <= addrlen);
385 family = address.ss_family;
389 /* On Solaris, this happens if the socket is not yet connected.
390 * But we can use SO_DOMAIN as a workaround there.
393 optlen = sizeof family;
394 if (getsockopt (fd, SOL_SOCKET, SO_DOMAIN, (void *)&family, &optlen) != 0)
396 errsv = get_socket_errno ();
400 /* This will translate to G_IO_ERROR_FAILED on either unix or windows */
408 case G_SOCKET_FAMILY_IPV4:
409 case G_SOCKET_FAMILY_IPV6:
410 socket->priv->family = address.ss_family;
411 switch (socket->priv->type)
413 case G_SOCKET_TYPE_STREAM:
414 socket->priv->protocol = G_SOCKET_PROTOCOL_TCP;
417 case G_SOCKET_TYPE_DATAGRAM:
418 socket->priv->protocol = G_SOCKET_PROTOCOL_UDP;
421 case G_SOCKET_TYPE_SEQPACKET:
422 socket->priv->protocol = G_SOCKET_PROTOCOL_SCTP;
430 case G_SOCKET_FAMILY_UNIX:
431 socket->priv->family = G_SOCKET_FAMILY_UNIX;
432 socket->priv->protocol = G_SOCKET_PROTOCOL_DEFAULT;
436 socket->priv->family = G_SOCKET_FAMILY_INVALID;
440 if (socket->priv->family != G_SOCKET_FAMILY_INVALID)
442 addrlen = sizeof address;
443 if (getpeername (fd, (struct sockaddr *) &address, &addrlen) >= 0)
444 socket->priv->connected = TRUE;
447 optlen = sizeof bool_val;
448 if (getsockopt (fd, SOL_SOCKET, SO_KEEPALIVE,
449 (void *)&bool_val, &optlen) == 0)
452 /* Experimentation indicates that the SO_KEEPALIVE value is
453 * actually a char on Windows, even if documentation claims it
454 * to be a BOOL which is a typedef for int. So this g_assert()
455 * fails. See bug #611756.
457 g_assert (optlen == sizeof bool_val);
459 socket->priv->keepalive = !!bool_val;
463 /* Can't read, maybe not supported, assume FALSE */
464 socket->priv->keepalive = FALSE;
470 g_set_error (&socket->priv->construct_error, G_IO_ERROR,
471 socket_io_error_from_errno (errsv),
472 _("creating GSocket from fd: %s"),
473 socket_strerror (errsv));
477 g_socket_create_socket (GSocketFamily family,
487 case G_SOCKET_TYPE_STREAM:
488 native_type = SOCK_STREAM;
491 case G_SOCKET_TYPE_DATAGRAM:
492 native_type = SOCK_DGRAM;
495 case G_SOCKET_TYPE_SEQPACKET:
496 native_type = SOCK_SEQPACKET;
500 g_assert_not_reached ();
505 g_set_error (error, G_IO_ERROR, G_IO_ERROR_INVALID_ARGUMENT,
506 _("Unable to create socket: %s"), _("Unknown family was specified"));
512 g_set_error (error, G_IO_ERROR, G_IO_ERROR_INVALID_ARGUMENT,
513 _("Unable to create socket: %s"), _("Unknown protocol was specified"));
518 fd = socket (family, native_type | SOCK_CLOEXEC, protocol);
519 /* It's possible that libc has SOCK_CLOEXEC but the kernel does not */
520 if (fd < 0 && errno == EINVAL)
522 fd = socket (family, native_type, protocol);
526 int errsv = get_socket_errno ();
528 g_set_error (error, G_IO_ERROR, socket_io_error_from_errno (errsv),
529 _("Unable to create socket: %s"), socket_strerror (errsv));
536 /* We always want to set close-on-exec to protect users. If you
537 need to so some weird inheritance to exec you can re-enable this
538 using lower level hacks with g_socket_get_fd(). */
539 flags = fcntl (fd, F_GETFD, 0);
541 (flags & FD_CLOEXEC) == 0)
544 fcntl (fd, F_SETFD, flags);
553 g_socket_constructed (GObject *object)
555 GSocket *socket = G_SOCKET (object);
557 if (socket->priv->fd >= 0)
558 /* create socket->priv info from the fd */
559 g_socket_details_from_fd (socket);
562 /* create the fd from socket->priv info */
563 socket->priv->fd = g_socket_create_socket (socket->priv->family,
565 socket->priv->protocol,
566 &socket->priv->construct_error);
568 /* Always use native nonblocking sockets, as
569 windows sets sockets to nonblocking automatically
570 in certain operations. This way we make things work
571 the same on all platforms */
572 if (socket->priv->fd != -1)
573 set_fd_nonblocking (socket->priv->fd);
577 g_socket_get_property (GObject *object,
582 GSocket *socket = G_SOCKET (object);
583 GSocketAddress *address;
588 g_value_set_enum (value, socket->priv->family);
592 g_value_set_enum (value, socket->priv->type);
596 g_value_set_enum (value, socket->priv->protocol);
600 g_value_set_int (value, socket->priv->fd);
604 g_value_set_boolean (value, socket->priv->blocking);
607 case PROP_LISTEN_BACKLOG:
608 g_value_set_int (value, socket->priv->listen_backlog);
612 g_value_set_boolean (value, socket->priv->keepalive);
615 case PROP_LOCAL_ADDRESS:
616 address = g_socket_get_local_address (socket, NULL);
617 g_value_take_object (value, address);
620 case PROP_REMOTE_ADDRESS:
621 address = g_socket_get_remote_address (socket, NULL);
622 g_value_take_object (value, address);
626 g_value_set_uint (value, socket->priv->timeout);
630 g_value_set_uint (value, g_socket_get_ttl (socket));
634 g_value_set_boolean (value, g_socket_get_broadcast (socket));
637 case PROP_MULTICAST_LOOPBACK:
638 g_value_set_boolean (value, g_socket_get_multicast_loopback (socket));
641 case PROP_MULTICAST_TTL:
642 g_value_set_uint (value, g_socket_get_multicast_ttl (socket));
646 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
651 g_socket_set_property (GObject *object,
656 GSocket *socket = G_SOCKET (object);
661 socket->priv->family = g_value_get_enum (value);
665 socket->priv->type = g_value_get_enum (value);
669 socket->priv->protocol = g_value_get_enum (value);
673 socket->priv->fd = g_value_get_int (value);
677 g_socket_set_blocking (socket, g_value_get_boolean (value));
680 case PROP_LISTEN_BACKLOG:
681 g_socket_set_listen_backlog (socket, g_value_get_int (value));
685 g_socket_set_keepalive (socket, g_value_get_boolean (value));
689 g_socket_set_timeout (socket, g_value_get_uint (value));
693 g_socket_set_ttl (socket, g_value_get_uint (value));
697 g_socket_set_broadcast (socket, g_value_get_boolean (value));
700 case PROP_MULTICAST_LOOPBACK:
701 g_socket_set_multicast_loopback (socket, g_value_get_boolean (value));
704 case PROP_MULTICAST_TTL:
705 g_socket_set_multicast_ttl (socket, g_value_get_uint (value));
709 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
714 g_socket_finalize (GObject *object)
716 GSocket *socket = G_SOCKET (object);
718 g_clear_error (&socket->priv->construct_error);
720 if (socket->priv->fd != -1 &&
721 !socket->priv->closed)
722 g_socket_close (socket, NULL);
724 if (socket->priv->remote_address)
725 g_object_unref (socket->priv->remote_address);
728 if (socket->priv->event != WSA_INVALID_EVENT)
730 WSACloseEvent (socket->priv->event);
731 socket->priv->event = WSA_INVALID_EVENT;
734 g_assert (socket->priv->requested_conditions == NULL);
737 if (G_OBJECT_CLASS (g_socket_parent_class)->finalize)
738 (*G_OBJECT_CLASS (g_socket_parent_class)->finalize) (object);
742 g_socket_class_init (GSocketClass *klass)
744 GObjectClass *gobject_class G_GNUC_UNUSED = G_OBJECT_CLASS (klass);
747 /* Make sure winsock has been initialized */
748 type = g_inet_address_get_type ();
749 (type); /* To avoid -Wunused-but-set-variable */
752 /* There is no portable, thread-safe way to avoid having the process
753 * be killed by SIGPIPE when calling send() or sendmsg(), so we are
754 * forced to simply ignore the signal process-wide.
756 signal (SIGPIPE, SIG_IGN);
759 g_type_class_add_private (klass, sizeof (GSocketPrivate));
761 gobject_class->finalize = g_socket_finalize;
762 gobject_class->constructed = g_socket_constructed;
763 gobject_class->set_property = g_socket_set_property;
764 gobject_class->get_property = g_socket_get_property;
766 g_object_class_install_property (gobject_class, PROP_FAMILY,
767 g_param_spec_enum ("family",
769 P_("The sockets address family"),
770 G_TYPE_SOCKET_FAMILY,
771 G_SOCKET_FAMILY_INVALID,
772 G_PARAM_CONSTRUCT_ONLY |
774 G_PARAM_STATIC_STRINGS));
776 g_object_class_install_property (gobject_class, PROP_TYPE,
777 g_param_spec_enum ("type",
779 P_("The sockets type"),
781 G_SOCKET_TYPE_STREAM,
782 G_PARAM_CONSTRUCT_ONLY |
784 G_PARAM_STATIC_STRINGS));
786 g_object_class_install_property (gobject_class, PROP_PROTOCOL,
787 g_param_spec_enum ("protocol",
788 P_("Socket protocol"),
789 P_("The id of the protocol to use, or -1 for unknown"),
790 G_TYPE_SOCKET_PROTOCOL,
791 G_SOCKET_PROTOCOL_UNKNOWN,
792 G_PARAM_CONSTRUCT_ONLY |
794 G_PARAM_STATIC_STRINGS));
796 g_object_class_install_property (gobject_class, PROP_FD,
797 g_param_spec_int ("fd",
798 P_("File descriptor"),
799 P_("The sockets file descriptor"),
803 G_PARAM_CONSTRUCT_ONLY |
805 G_PARAM_STATIC_STRINGS));
807 g_object_class_install_property (gobject_class, PROP_BLOCKING,
808 g_param_spec_boolean ("blocking",
810 P_("Whether or not I/O on this socket is blocking"),
813 G_PARAM_STATIC_STRINGS));
815 g_object_class_install_property (gobject_class, PROP_LISTEN_BACKLOG,
816 g_param_spec_int ("listen-backlog",
817 P_("Listen backlog"),
818 P_("Outstanding connections in the listen queue"),
823 G_PARAM_STATIC_STRINGS));
825 g_object_class_install_property (gobject_class, PROP_KEEPALIVE,
826 g_param_spec_boolean ("keepalive",
827 P_("Keep connection alive"),
828 P_("Keep connection alive by sending periodic pings"),
831 G_PARAM_STATIC_STRINGS));
833 g_object_class_install_property (gobject_class, PROP_LOCAL_ADDRESS,
834 g_param_spec_object ("local-address",
836 P_("The local address the socket is bound to"),
837 G_TYPE_SOCKET_ADDRESS,
839 G_PARAM_STATIC_STRINGS));
841 g_object_class_install_property (gobject_class, PROP_REMOTE_ADDRESS,
842 g_param_spec_object ("remote-address",
843 P_("Remote address"),
844 P_("The remote address the socket is connected to"),
845 G_TYPE_SOCKET_ADDRESS,
847 G_PARAM_STATIC_STRINGS));
852 * The timeout in seconds on socket I/O
856 g_object_class_install_property (gobject_class, PROP_TIMEOUT,
857 g_param_spec_uint ("timeout",
859 P_("The timeout in seconds on socket I/O"),
864 G_PARAM_STATIC_STRINGS));
869 * Whether the socket should allow sending to and receiving from broadcast addresses.
873 g_object_class_install_property (gobject_class, PROP_BROADCAST,
874 g_param_spec_boolean ("broadcast",
876 P_("Whether to allow sending to and receiving from broadcast addresses"),
879 G_PARAM_STATIC_STRINGS));
884 * Time-to-live for outgoing unicast packets
888 g_object_class_install_property (gobject_class, PROP_TTL,
889 g_param_spec_uint ("ttl",
891 P_("Time-to-live of outgoing unicast packets"),
894 G_PARAM_STATIC_STRINGS));
897 * GSocket:multicast-loopback:
899 * Whether outgoing multicast packets loop back to the local host.
903 g_object_class_install_property (gobject_class, PROP_MULTICAST_LOOPBACK,
904 g_param_spec_boolean ("multicast-loopback",
905 P_("Multicast loopback"),
906 P_("Whether outgoing multicast packets loop back to the local host"),
909 G_PARAM_STATIC_STRINGS));
912 * GSocket:multicast-ttl:
914 * Time-to-live out outgoing multicast packets
918 g_object_class_install_property (gobject_class, PROP_MULTICAST_TTL,
919 g_param_spec_uint ("multicast-ttl",
921 P_("Time-to-live of outgoing multicast packets"),
924 G_PARAM_STATIC_STRINGS));
928 g_socket_initable_iface_init (GInitableIface *iface)
930 iface->init = g_socket_initable_init;
934 g_socket_init (GSocket *socket)
936 socket->priv = G_TYPE_INSTANCE_GET_PRIVATE (socket, G_TYPE_SOCKET, GSocketPrivate);
938 socket->priv->fd = -1;
939 socket->priv->blocking = TRUE;
940 socket->priv->listen_backlog = 10;
941 socket->priv->construct_error = NULL;
943 socket->priv->event = WSA_INVALID_EVENT;
948 g_socket_initable_init (GInitable *initable,
949 GCancellable *cancellable,
954 g_return_val_if_fail (G_IS_SOCKET (initable), FALSE);
956 socket = G_SOCKET (initable);
958 if (cancellable != NULL)
960 g_set_error_literal (error, G_IO_ERROR, G_IO_ERROR_NOT_SUPPORTED,
961 _("Cancellable initialization not supported"));
965 socket->priv->inited = TRUE;
967 if (socket->priv->construct_error)
970 *error = g_error_copy (socket->priv->construct_error);
980 * @family: the socket family to use, e.g. %G_SOCKET_FAMILY_IPV4.
981 * @type: the socket type to use.
982 * @protocol: the id of the protocol to use, or 0 for default.
983 * @error: #GError for error reporting, or %NULL to ignore.
985 * Creates a new #GSocket with the defined family, type and protocol.
986 * If @protocol is 0 (%G_SOCKET_PROTOCOL_DEFAULT) the default protocol type
987 * for the family and type is used.
989 * The @protocol is a family and type specific int that specifies what
990 * kind of protocol to use. #GSocketProtocol lists several common ones.
991 * Many families only support one protocol, and use 0 for this, others
992 * support several and using 0 means to use the default protocol for
993 * the family and type.
995 * The protocol id is passed directly to the operating
996 * system, so you can use protocols not listed in #GSocketProtocol if you
997 * know the protocol number used for it.
999 * Returns: a #GSocket or %NULL on error.
1000 * Free the returned object with g_object_unref().
1005 g_socket_new (GSocketFamily family,
1007 GSocketProtocol protocol,
1010 return G_SOCKET (g_initable_new (G_TYPE_SOCKET,
1014 "protocol", protocol,
1019 * g_socket_new_from_fd:
1020 * @fd: a native socket file descriptor.
1021 * @error: #GError for error reporting, or %NULL to ignore.
1023 * Creates a new #GSocket from a native file descriptor
1024 * or winsock SOCKET handle.
1026 * This reads all the settings from the file descriptor so that
1027 * all properties should work. Note that the file descriptor
1028 * will be set to non-blocking mode, independent on the blocking
1029 * mode of the #GSocket.
1031 * Returns: a #GSocket or %NULL on error.
1032 * Free the returned object with g_object_unref().
1037 g_socket_new_from_fd (gint fd,
1040 return G_SOCKET (g_initable_new (G_TYPE_SOCKET,
1047 * g_socket_set_blocking:
1048 * @socket: a #GSocket.
1049 * @blocking: Whether to use blocking I/O or not.
1051 * Sets the blocking mode of the socket. In blocking mode
1052 * all operations block until they succeed or there is an error. In
1053 * non-blocking mode all functions return results immediately or
1054 * with a %G_IO_ERROR_WOULD_BLOCK error.
1056 * All sockets are created in blocking mode. However, note that the
1057 * platform level socket is always non-blocking, and blocking mode
1058 * is a GSocket level feature.
1063 g_socket_set_blocking (GSocket *socket,
1066 g_return_if_fail (G_IS_SOCKET (socket));
1068 blocking = !!blocking;
1070 if (socket->priv->blocking == blocking)
1073 socket->priv->blocking = blocking;
1074 g_object_notify (G_OBJECT (socket), "blocking");
1078 * g_socket_get_blocking:
1079 * @socket: a #GSocket.
1081 * Gets the blocking mode of the socket. For details on blocking I/O,
1082 * see g_socket_set_blocking().
1084 * Returns: %TRUE if blocking I/O is used, %FALSE otherwise.
1089 g_socket_get_blocking (GSocket *socket)
1091 g_return_val_if_fail (G_IS_SOCKET (socket), FALSE);
1093 return socket->priv->blocking;
1097 * g_socket_set_keepalive:
1098 * @socket: a #GSocket.
1099 * @keepalive: Value for the keepalive flag
1101 * Sets or unsets the %SO_KEEPALIVE flag on the underlying socket. When
1102 * this flag is set on a socket, the system will attempt to verify that the
1103 * remote socket endpoint is still present if a sufficiently long period of
1104 * time passes with no data being exchanged. If the system is unable to
1105 * verify the presence of the remote endpoint, it will automatically close
1108 * This option is only functional on certain kinds of sockets. (Notably,
1109 * %G_SOCKET_PROTOCOL_TCP sockets.)
1111 * The exact time between pings is system- and protocol-dependent, but will
1112 * normally be at least two hours. Most commonly, you would set this flag
1113 * on a server socket if you want to allow clients to remain idle for long
1114 * periods of time, but also want to ensure that connections are eventually
1115 * garbage-collected if clients crash or become unreachable.
1120 g_socket_set_keepalive (GSocket *socket,
1125 g_return_if_fail (G_IS_SOCKET (socket));
1127 keepalive = !!keepalive;
1128 if (socket->priv->keepalive == keepalive)
1131 value = (gint) keepalive;
1132 if (setsockopt (socket->priv->fd, SOL_SOCKET, SO_KEEPALIVE,
1133 (gpointer) &value, sizeof (value)) < 0)
1135 int errsv = get_socket_errno ();
1136 g_warning ("error setting keepalive: %s", socket_strerror (errsv));
1140 socket->priv->keepalive = keepalive;
1141 g_object_notify (G_OBJECT (socket), "keepalive");
1145 * g_socket_get_keepalive:
1146 * @socket: a #GSocket.
1148 * Gets the keepalive mode of the socket. For details on this,
1149 * see g_socket_set_keepalive().
1151 * Returns: %TRUE if keepalive is active, %FALSE otherwise.
1156 g_socket_get_keepalive (GSocket *socket)
1158 g_return_val_if_fail (G_IS_SOCKET (socket), FALSE);
1160 return socket->priv->keepalive;
1164 * g_socket_get_listen_backlog:
1165 * @socket: a #GSocket.
1167 * Gets the listen backlog setting of the socket. For details on this,
1168 * see g_socket_set_listen_backlog().
1170 * Returns: the maximum number of pending connections.
1175 g_socket_get_listen_backlog (GSocket *socket)
1177 g_return_val_if_fail (G_IS_SOCKET (socket), 0);
1179 return socket->priv->listen_backlog;
1183 * g_socket_set_listen_backlog:
1184 * @socket: a #GSocket.
1185 * @backlog: the maximum number of pending connections.
1187 * Sets the maximum number of outstanding connections allowed
1188 * when listening on this socket. If more clients than this are
1189 * connecting to the socket and the application is not handling them
1190 * on time then the new connections will be refused.
1192 * Note that this must be called before g_socket_listen() and has no
1193 * effect if called after that.
1198 g_socket_set_listen_backlog (GSocket *socket,
1201 g_return_if_fail (G_IS_SOCKET (socket));
1202 g_return_if_fail (!socket->priv->listening);
1204 if (backlog != socket->priv->listen_backlog)
1206 socket->priv->listen_backlog = backlog;
1207 g_object_notify (G_OBJECT (socket), "listen-backlog");
1212 * g_socket_get_timeout:
1213 * @socket: a #GSocket.
1215 * Gets the timeout setting of the socket. For details on this, see
1216 * g_socket_set_timeout().
1218 * Returns: the timeout in seconds
1223 g_socket_get_timeout (GSocket *socket)
1225 g_return_val_if_fail (G_IS_SOCKET (socket), 0);
1227 return socket->priv->timeout;
1231 * g_socket_set_timeout:
1232 * @socket: a #GSocket.
1233 * @timeout: the timeout for @socket, in seconds, or 0 for none
1235 * Sets the time in seconds after which I/O operations on @socket will
1236 * time out if they have not yet completed.
1238 * On a blocking socket, this means that any blocking #GSocket
1239 * operation will time out after @timeout seconds of inactivity,
1240 * returning %G_IO_ERROR_TIMED_OUT.
1242 * On a non-blocking socket, calls to g_socket_condition_wait() will
1243 * also fail with %G_IO_ERROR_TIMED_OUT after the given time. Sources
1244 * created with g_socket_create_source() will trigger after
1245 * @timeout seconds of inactivity, with the requested condition
1246 * set, at which point calling g_socket_receive(), g_socket_send(),
1247 * g_socket_check_connect_result(), etc, will fail with
1248 * %G_IO_ERROR_TIMED_OUT.
1250 * If @timeout is 0 (the default), operations will never time out
1253 * Note that if an I/O operation is interrupted by a signal, this may
1254 * cause the timeout to be reset.
1259 g_socket_set_timeout (GSocket *socket,
1262 g_return_if_fail (G_IS_SOCKET (socket));
1264 if (timeout != socket->priv->timeout)
1266 socket->priv->timeout = timeout;
1267 g_object_notify (G_OBJECT (socket), "timeout");
1273 * @socket: a #GSocket.
1275 * Gets the unicast time-to-live setting on @socket; see
1276 * g_socket_set_ttl() for more details.
1278 * Returns: the time-to-live setting on @socket
1283 g_socket_get_ttl (GSocket *socket)
1286 guint value, optlen;
1288 g_return_val_if_fail (G_IS_SOCKET (socket), FALSE);
1290 if (socket->priv->family == G_SOCKET_FAMILY_IPV4)
1294 optlen = sizeof (optval);
1295 result = getsockopt (socket->priv->fd, IPPROTO_IP, IP_TTL,
1299 else if (socket->priv->family == G_SOCKET_FAMILY_IPV6)
1301 optlen = sizeof (value);
1302 result = getsockopt (socket->priv->fd, IPPROTO_IPV6, IPV6_UNICAST_HOPS,
1306 g_return_val_if_reached (FALSE);
1310 int errsv = get_socket_errno ();
1311 g_warning ("error getting unicast ttl: %s", socket_strerror (errsv));
1320 * @socket: a #GSocket.
1321 * @ttl: the time-to-live value for all unicast packets on @socket
1323 * Sets the time-to-live for outgoing unicast packets on @socket.
1324 * By default the platform-specific default value is used.
1329 g_socket_set_ttl (GSocket *socket,
1334 g_return_if_fail (G_IS_SOCKET (socket));
1336 if (socket->priv->family == G_SOCKET_FAMILY_IPV4)
1338 guchar optval = (guchar)ttl;
1340 result = setsockopt (socket->priv->fd, IPPROTO_IP, IP_TTL,
1341 &optval, sizeof (optval));
1343 else if (socket->priv->family == G_SOCKET_FAMILY_IPV6)
1345 result = setsockopt (socket->priv->fd, IPPROTO_IPV6, IPV6_UNICAST_HOPS,
1346 &ttl, sizeof (ttl));
1349 g_return_if_reached ();
1353 int errsv = get_socket_errno ();
1354 g_warning ("error setting unicast ttl: %s", socket_strerror (errsv));
1358 g_object_notify (G_OBJECT (socket), "ttl");
1362 * g_socket_get_broadcast:
1363 * @socket: a #GSocket.
1365 * Gets the broadcast setting on @socket; if %TRUE,
1366 * it is possible to send packets to broadcast
1367 * addresses or receive from broadcast addresses.
1369 * Returns: the broadcast setting on @socket
1374 g_socket_get_broadcast (GSocket *socket)
1377 guint value = 0, optlen;
1379 g_return_val_if_fail (G_IS_SOCKET (socket), FALSE);
1381 optlen = sizeof (guchar);
1382 result = getsockopt (socket->priv->fd, SOL_SOCKET, SO_BROADCAST,
1387 int errsv = get_socket_errno ();
1388 g_warning ("error getting broadcast: %s", socket_strerror (errsv));
1396 * g_socket_set_broadcast:
1397 * @socket: a #GSocket.
1398 * @broadcast: whether @socket should allow sending to and receiving
1399 * from broadcast addresses
1401 * Sets whether @socket should allow sending to and receiving from
1402 * broadcast addresses. This is %FALSE by default.
1407 g_socket_set_broadcast (GSocket *socket,
1413 g_return_if_fail (G_IS_SOCKET (socket));
1415 broadcast = !!broadcast;
1416 value = (guchar)broadcast;
1418 result = setsockopt (socket->priv->fd, SOL_SOCKET, SO_BROADCAST,
1419 &value, sizeof (value));
1423 int errsv = get_socket_errno ();
1424 g_warning ("error setting broadcast: %s", socket_strerror (errsv));
1428 g_object_notify (G_OBJECT (socket), "broadcast");
1432 * g_socket_get_multicast_loopback:
1433 * @socket: a #GSocket.
1435 * Gets the multicast loopback setting on @socket; if %TRUE (the
1436 * default), outgoing multicast packets will be looped back to
1437 * multicast listeners on the same host.
1439 * Returns: the multicast loopback setting on @socket
1444 g_socket_get_multicast_loopback (GSocket *socket)
1447 guint value = 0, optlen;
1449 g_return_val_if_fail (G_IS_SOCKET (socket), FALSE);
1451 if (socket->priv->family == G_SOCKET_FAMILY_IPV4)
1453 optlen = sizeof (guchar);
1454 result = getsockopt (socket->priv->fd, IPPROTO_IP, IP_MULTICAST_LOOP,
1457 else if (socket->priv->family == G_SOCKET_FAMILY_IPV6)
1459 optlen = sizeof (guint);
1460 result = getsockopt (socket->priv->fd, IPPROTO_IPV6, IPV6_MULTICAST_LOOP,
1464 g_return_val_if_reached (FALSE);
1468 int errsv = get_socket_errno ();
1469 g_warning ("error getting multicast loopback: %s", socket_strerror (errsv));
1477 * g_socket_set_multicast_loopback:
1478 * @socket: a #GSocket.
1479 * @loopback: whether @socket should receive messages sent to its
1480 * multicast groups from the local host
1482 * Sets whether outgoing multicast packets will be received by sockets
1483 * listening on that multicast address on the same host. This is %TRUE
1489 g_socket_set_multicast_loopback (GSocket *socket,
1494 g_return_if_fail (G_IS_SOCKET (socket));
1496 loopback = !!loopback;
1498 if (socket->priv->family == G_SOCKET_FAMILY_IPV4)
1500 guchar value = (guchar)loopback;
1502 result = setsockopt (socket->priv->fd, IPPROTO_IP, IP_MULTICAST_LOOP,
1503 &value, sizeof (value));
1505 else if (socket->priv->family == G_SOCKET_FAMILY_IPV6)
1507 guint value = (guint)loopback;
1509 result = setsockopt (socket->priv->fd, IPPROTO_IPV6, IPV6_MULTICAST_LOOP,
1510 &value, sizeof (value));
1513 g_return_if_reached ();
1517 int errsv = get_socket_errno ();
1518 g_warning ("error setting multicast loopback: %s", socket_strerror (errsv));
1522 g_object_notify (G_OBJECT (socket), "multicast-loopback");
1526 * g_socket_get_multicast_ttl:
1527 * @socket: a #GSocket.
1529 * Gets the multicast time-to-live setting on @socket; see
1530 * g_socket_set_multicast_ttl() for more details.
1532 * Returns: the multicast time-to-live setting on @socket
1537 g_socket_get_multicast_ttl (GSocket *socket)
1540 guint value, optlen;
1542 g_return_val_if_fail (G_IS_SOCKET (socket), FALSE);
1544 if (socket->priv->family == G_SOCKET_FAMILY_IPV4)
1548 optlen = sizeof (optval);
1549 result = getsockopt (socket->priv->fd, IPPROTO_IP, IP_MULTICAST_TTL,
1553 else if (socket->priv->family == G_SOCKET_FAMILY_IPV6)
1555 optlen = sizeof (value);
1556 result = getsockopt (socket->priv->fd, IPPROTO_IPV6, IPV6_MULTICAST_HOPS,
1560 g_return_val_if_reached (FALSE);
1564 int errsv = get_socket_errno ();
1565 g_warning ("error getting multicast ttl: %s", socket_strerror (errsv));
1573 * g_socket_set_multicast_ttl:
1574 * @socket: a #GSocket.
1575 * @ttl: the time-to-live value for all multicast datagrams on @socket
1577 * Sets the time-to-live for outgoing multicast datagrams on @socket.
1578 * By default, this is 1, meaning that multicast packets will not leave
1579 * the local network.
1584 g_socket_set_multicast_ttl (GSocket *socket,
1589 g_return_if_fail (G_IS_SOCKET (socket));
1591 if (socket->priv->family == G_SOCKET_FAMILY_IPV4)
1593 guchar optval = (guchar)ttl;
1595 result = setsockopt (socket->priv->fd, IPPROTO_IP, IP_MULTICAST_TTL,
1596 &optval, sizeof (optval));
1598 else if (socket->priv->family == G_SOCKET_FAMILY_IPV6)
1600 result = setsockopt (socket->priv->fd, IPPROTO_IPV6, IPV6_MULTICAST_HOPS,
1601 &ttl, sizeof (ttl));
1604 g_return_if_reached ();
1608 int errsv = get_socket_errno ();
1609 g_warning ("error setting multicast ttl: %s", socket_strerror (errsv));
1613 g_object_notify (G_OBJECT (socket), "multicast-ttl");
1617 * g_socket_get_family:
1618 * @socket: a #GSocket.
1620 * Gets the socket family of the socket.
1622 * Returns: a #GSocketFamily
1627 g_socket_get_family (GSocket *socket)
1629 g_return_val_if_fail (G_IS_SOCKET (socket), G_SOCKET_FAMILY_INVALID);
1631 return socket->priv->family;
1635 * g_socket_get_socket_type:
1636 * @socket: a #GSocket.
1638 * Gets the socket type of the socket.
1640 * Returns: a #GSocketType
1645 g_socket_get_socket_type (GSocket *socket)
1647 g_return_val_if_fail (G_IS_SOCKET (socket), G_SOCKET_TYPE_INVALID);
1649 return socket->priv->type;
1653 * g_socket_get_protocol:
1654 * @socket: a #GSocket.
1656 * Gets the socket protocol id the socket was created with.
1657 * In case the protocol is unknown, -1 is returned.
1659 * Returns: a protocol id, or -1 if unknown
1664 g_socket_get_protocol (GSocket *socket)
1666 g_return_val_if_fail (G_IS_SOCKET (socket), -1);
1668 return socket->priv->protocol;
1673 * @socket: a #GSocket.
1675 * Returns the underlying OS socket object. On unix this
1676 * is a socket file descriptor, and on windows this is
1677 * a Winsock2 SOCKET handle. This may be useful for
1678 * doing platform specific or otherwise unusual operations
1681 * Returns: the file descriptor of the socket.
1686 g_socket_get_fd (GSocket *socket)
1688 g_return_val_if_fail (G_IS_SOCKET (socket), -1);
1690 return socket->priv->fd;
1694 * g_socket_get_local_address:
1695 * @socket: a #GSocket.
1696 * @error: #GError for error reporting, or %NULL to ignore.
1698 * Try to get the local address of a bound socket. This is only
1699 * useful if the socket has been bound to a local address,
1700 * either explicitly or implicitly when connecting.
1702 * Returns: (transfer full): a #GSocketAddress or %NULL on error.
1703 * Free the returned object with g_object_unref().
1708 g_socket_get_local_address (GSocket *socket,
1711 struct sockaddr_storage buffer;
1712 guint32 len = sizeof (buffer);
1714 g_return_val_if_fail (G_IS_SOCKET (socket), NULL);
1716 if (getsockname (socket->priv->fd, (struct sockaddr *) &buffer, &len) < 0)
1718 int errsv = get_socket_errno ();
1719 g_set_error (error, G_IO_ERROR, socket_io_error_from_errno (errsv),
1720 _("could not get local address: %s"), socket_strerror (errsv));
1724 return g_socket_address_new_from_native (&buffer, len);
1728 * g_socket_get_remote_address:
1729 * @socket: a #GSocket.
1730 * @error: #GError for error reporting, or %NULL to ignore.
1732 * Try to get the remove address of a connected socket. This is only
1733 * useful for connection oriented sockets that have been connected.
1735 * Returns: (transfer full): a #GSocketAddress or %NULL on error.
1736 * Free the returned object with g_object_unref().
1741 g_socket_get_remote_address (GSocket *socket,
1744 struct sockaddr_storage buffer;
1745 guint32 len = sizeof (buffer);
1747 g_return_val_if_fail (G_IS_SOCKET (socket), NULL);
1749 if (socket->priv->connect_pending)
1751 if (!g_socket_check_connect_result (socket, error))
1754 socket->priv->connect_pending = FALSE;
1757 if (!socket->priv->remote_address)
1759 if (getpeername (socket->priv->fd, (struct sockaddr *) &buffer, &len) < 0)
1761 int errsv = get_socket_errno ();
1762 g_set_error (error, G_IO_ERROR, socket_io_error_from_errno (errsv),
1763 _("could not get remote address: %s"), socket_strerror (errsv));
1767 socket->priv->remote_address = g_socket_address_new_from_native (&buffer, len);
1770 return g_object_ref (socket->priv->remote_address);
1774 * g_socket_is_connected:
1775 * @socket: a #GSocket.
1777 * Check whether the socket is connected. This is only useful for
1778 * connection-oriented sockets.
1780 * Returns: %TRUE if socket is connected, %FALSE otherwise.
1785 g_socket_is_connected (GSocket *socket)
1787 g_return_val_if_fail (G_IS_SOCKET (socket), FALSE);
1789 return socket->priv->connected;
1794 * @socket: a #GSocket.
1795 * @error: #GError for error reporting, or %NULL to ignore.
1797 * Marks the socket as a server socket, i.e. a socket that is used
1798 * to accept incoming requests using g_socket_accept().
1800 * Before calling this the socket must be bound to a local address using
1803 * To set the maximum amount of outstanding clients, use
1804 * g_socket_set_listen_backlog().
1806 * Returns: %TRUE on success, %FALSE on error.
1811 g_socket_listen (GSocket *socket,
1814 g_return_val_if_fail (G_IS_SOCKET (socket), FALSE);
1816 if (!check_socket (socket, error))
1819 if (listen (socket->priv->fd, socket->priv->listen_backlog) < 0)
1821 int errsv = get_socket_errno ();
1823 g_set_error (error, G_IO_ERROR, socket_io_error_from_errno (errsv),
1824 _("could not listen: %s"), socket_strerror (errsv));
1828 socket->priv->listening = TRUE;
1835 * @socket: a #GSocket.
1836 * @address: a #GSocketAddress specifying the local address.
1837 * @allow_reuse: whether to allow reusing this address
1838 * @error: #GError for error reporting, or %NULL to ignore.
1840 * When a socket is created it is attached to an address family, but it
1841 * doesn't have an address in this family. g_socket_bind() assigns the
1842 * address (sometimes called name) of the socket.
1844 * It is generally required to bind to a local address before you can
1845 * receive connections. (See g_socket_listen() and g_socket_accept() ).
1846 * In certain situations, you may also want to bind a socket that will be
1847 * used to initiate connections, though this is not normally required.
1849 * @allow_reuse should be %TRUE for server sockets (sockets that you will
1850 * eventually call g_socket_accept() on), and %FALSE for client sockets.
1851 * (Specifically, if it is %TRUE, then g_socket_bind() will set the
1852 * %SO_REUSEADDR flag on the socket, allowing it to bind @address even if
1853 * that address was previously used by another socket that has not yet been
1854 * fully cleaned-up by the kernel. Failing to set this flag on a server
1855 * socket may cause the bind call to return %G_IO_ERROR_ADDRESS_IN_USE if
1856 * the server program is stopped and then immediately restarted.)
1858 * Returns: %TRUE on success, %FALSE on error.
1863 g_socket_bind (GSocket *socket,
1864 GSocketAddress *address,
1865 gboolean reuse_address,
1868 struct sockaddr_storage addr;
1870 g_return_val_if_fail (G_IS_SOCKET (socket) && G_IS_SOCKET_ADDRESS (address), FALSE);
1872 if (!check_socket (socket, error))
1875 /* SO_REUSEADDR on windows means something else and is not what we want.
1876 It always allows the unix variant of SO_REUSEADDR anyway */
1881 value = (int) !!reuse_address;
1882 /* Ignore errors here, the only likely error is "not supported", and
1883 this is a "best effort" thing mainly */
1884 setsockopt (socket->priv->fd, SOL_SOCKET, SO_REUSEADDR,
1885 (gpointer) &value, sizeof (value));
1889 if (!g_socket_address_to_native (address, &addr, sizeof addr, error))
1892 if (bind (socket->priv->fd, (struct sockaddr *) &addr,
1893 g_socket_address_get_native_size (address)) < 0)
1895 int errsv = get_socket_errno ();
1897 G_IO_ERROR, socket_io_error_from_errno (errsv),
1898 _("Error binding to address: %s"), socket_strerror (errsv));
1906 g_socket_multicast_group_operation (GSocket *socket,
1907 GInetAddress *group,
1908 gboolean source_specific,
1910 gboolean join_group,
1913 const guint8 *native_addr;
1914 gint optname, result;
1916 g_return_val_if_fail (G_IS_SOCKET (socket), FALSE);
1917 g_return_val_if_fail (socket->priv->type == G_SOCKET_TYPE_DATAGRAM, FALSE);
1918 g_return_val_if_fail (G_IS_INET_ADDRESS (group), FALSE);
1919 g_return_val_if_fail (g_inet_address_get_family (group) == socket->priv->family, FALSE);
1921 if (!check_socket (socket, error))
1924 native_addr = g_inet_address_to_bytes (group);
1925 if (socket->priv->family == G_SOCKET_FAMILY_IPV4)
1927 #ifdef HAVE_IP_MREQN
1928 struct ip_mreqn mc_req;
1930 struct ip_mreq mc_req;
1933 memcpy (&mc_req.imr_multiaddr, native_addr, sizeof (struct in_addr));
1935 #ifdef HAVE_IP_MREQN
1937 mc_req.imr_ifindex = if_nametoindex (iface);
1939 mc_req.imr_ifindex = 0; /* Pick any. */
1941 mc_req.imr_interface.s_addr = g_htonl (INADDR_ANY);
1944 if (source_specific)
1946 #ifdef IP_ADD_SOURCE_MEMBERSHIP
1947 optname = join_group ? IP_ADD_SOURCE_MEMBERSHIP : IP_DROP_SOURCE_MEMBERSHIP;
1949 g_set_error (error, G_IO_ERROR, G_IO_ERROR_NOT_SUPPORTED,
1951 _("Error joining multicast group: %s") :
1952 _("Error leaving multicast group: %s"),
1953 _("No support for source-specific multicast"));
1958 optname = join_group ? IP_ADD_MEMBERSHIP : IP_DROP_MEMBERSHIP;
1959 result = setsockopt (socket->priv->fd, IPPROTO_IP, optname,
1960 &mc_req, sizeof (mc_req));
1962 else if (socket->priv->family == G_SOCKET_FAMILY_IPV6)
1964 struct ipv6_mreq mc_req_ipv6;
1966 memcpy (&mc_req_ipv6.ipv6mr_multiaddr, native_addr, sizeof (struct in6_addr));
1967 #ifdef HAVE_IF_NAMETOINDEX
1969 mc_req_ipv6.ipv6mr_interface = if_nametoindex (iface);
1972 mc_req_ipv6.ipv6mr_interface = 0;
1974 optname = join_group ? IPV6_JOIN_GROUP : IPV6_LEAVE_GROUP;
1975 result = setsockopt (socket->priv->fd, IPPROTO_IPV6, optname,
1976 &mc_req_ipv6, sizeof (mc_req_ipv6));
1979 g_return_val_if_reached (FALSE);
1983 int errsv = get_socket_errno ();
1985 g_set_error (error, G_IO_ERROR, socket_io_error_from_errno (errsv),
1987 _("Error joining multicast group: %s") :
1988 _("Error leaving multicast group: %s"),
1989 socket_strerror (errsv));
1997 * g_socket_join_multicast_group:
1998 * @socket: a #GSocket.
1999 * @group: a #GInetAddress specifying the group address to join.
2000 * @iface: (allow-none): Name of the interface to use, or %NULL
2001 * @source_specific: %TRUE if source-specific multicast should be used
2002 * @error: #GError for error reporting, or %NULL to ignore.
2004 * Registers @socket to receive multicast messages sent to @group.
2005 * @socket must be a %G_SOCKET_TYPE_DATAGRAM socket, and must have
2006 * been bound to an appropriate interface and port with
2009 * If @iface is %NULL, the system will automatically pick an interface
2010 * to bind to based on @group.
2012 * If @source_specific is %TRUE, source-specific multicast as defined
2013 * in RFC 4604 is used. Note that on older platforms this may fail
2014 * with a %G_IO_ERROR_NOT_SUPPORTED error.
2016 * Returns: %TRUE on success, %FALSE on error.
2021 g_socket_join_multicast_group (GSocket *socket,
2022 GInetAddress *group,
2023 gboolean source_specific,
2027 return g_socket_multicast_group_operation (socket, group, source_specific, iface, TRUE, error);
2031 * g_socket_leave_multicast_group:
2032 * @socket: a #GSocket.
2033 * @group: a #GInetAddress specifying the group address to leave.
2034 * @iface: (allow-none): Interface used
2035 * @source_specific: %TRUE if source-specific multicast was used
2036 * @error: #GError for error reporting, or %NULL to ignore.
2038 * Removes @socket from the multicast group defined by @group, @iface,
2039 * and @source_specific (which must all have the same values they had
2040 * when you joined the group).
2042 * @socket remains bound to its address and port, and can still receive
2043 * unicast messages after calling this.
2045 * Returns: %TRUE on success, %FALSE on error.
2050 g_socket_leave_multicast_group (GSocket *socket,
2051 GInetAddress *group,
2052 gboolean source_specific,
2056 return g_socket_multicast_group_operation (socket, group, source_specific, iface, FALSE, error);
2060 * g_socket_speaks_ipv4:
2061 * @socket: a #GSocket
2063 * Checks if a socket is capable of speaking IPv4.
2065 * IPv4 sockets are capable of speaking IPv4. On some operating systems
2066 * and under some combinations of circumstances IPv6 sockets are also
2067 * capable of speaking IPv4. See RFC 3493 section 3.7 for more
2070 * No other types of sockets are currently considered as being capable
2073 * Returns: %TRUE if this socket can be used with IPv4.
2078 g_socket_speaks_ipv4 (GSocket *socket)
2080 switch (socket->priv->family)
2082 case G_SOCKET_FAMILY_IPV4:
2085 case G_SOCKET_FAMILY_IPV6:
2086 #if defined (IPPROTO_IPV6) && defined (IPV6_V6ONLY)
2088 guint sizeof_int = sizeof (int);
2091 if (getsockopt (socket->priv->fd,
2092 IPPROTO_IPV6, IPV6_V6ONLY,
2093 &v6_only, &sizeof_int) != 0)
2109 * @socket: a #GSocket.
2110 * @cancellable: (allow-none): a %GCancellable or %NULL
2111 * @error: #GError for error reporting, or %NULL to ignore.
2113 * Accept incoming connections on a connection-based socket. This removes
2114 * the first outstanding connection request from the listening socket and
2115 * creates a #GSocket object for it.
2117 * The @socket must be bound to a local address with g_socket_bind() and
2118 * must be listening for incoming connections (g_socket_listen()).
2120 * If there are no outstanding connections then the operation will block
2121 * or return %G_IO_ERROR_WOULD_BLOCK if non-blocking I/O is enabled.
2122 * To be notified of an incoming connection, wait for the %G_IO_IN condition.
2124 * Returns: (transfer full): a new #GSocket, or %NULL on error.
2125 * Free the returned object with g_object_unref().
2130 g_socket_accept (GSocket *socket,
2131 GCancellable *cancellable,
2134 GSocket *new_socket;
2137 g_return_val_if_fail (G_IS_SOCKET (socket), NULL);
2139 if (!check_socket (socket, error))
2144 if (socket->priv->blocking &&
2145 !g_socket_condition_wait (socket,
2146 G_IO_IN, cancellable, error))
2149 if ((ret = accept (socket->priv->fd, NULL, 0)) < 0)
2151 int errsv = get_socket_errno ();
2153 win32_unset_event_mask (socket, FD_ACCEPT);
2158 if (socket->priv->blocking)
2160 #ifdef WSAEWOULDBLOCK
2161 if (errsv == WSAEWOULDBLOCK)
2164 if (errsv == EWOULDBLOCK ||
2170 g_set_error (error, G_IO_ERROR,
2171 socket_io_error_from_errno (errsv),
2172 _("Error accepting connection: %s"), socket_strerror (errsv));
2178 win32_unset_event_mask (socket, FD_ACCEPT);
2182 /* The socket inherits the accepting sockets event mask and even object,
2183 we need to remove that */
2184 WSAEventSelect (ret, NULL, 0);
2190 /* We always want to set close-on-exec to protect users. If you
2191 need to so some weird inheritance to exec you can re-enable this
2192 using lower level hacks with g_socket_get_fd(). */
2193 flags = fcntl (ret, F_GETFD, 0);
2195 (flags & FD_CLOEXEC) == 0)
2197 flags |= FD_CLOEXEC;
2198 fcntl (ret, F_SETFD, flags);
2203 new_socket = g_socket_new_from_fd (ret, error);
2204 if (new_socket == NULL)
2213 new_socket->priv->protocol = socket->priv->protocol;
2220 * @socket: a #GSocket.
2221 * @address: a #GSocketAddress specifying the remote address.
2222 * @cancellable: (allow-none): a %GCancellable or %NULL
2223 * @error: #GError for error reporting, or %NULL to ignore.
2225 * Connect the socket to the specified remote address.
2227 * For connection oriented socket this generally means we attempt to make
2228 * a connection to the @address. For a connection-less socket it sets
2229 * the default address for g_socket_send() and discards all incoming datagrams
2230 * from other sources.
2232 * Generally connection oriented sockets can only connect once, but
2233 * connection-less sockets can connect multiple times to change the
2236 * If the connect call needs to do network I/O it will block, unless
2237 * non-blocking I/O is enabled. Then %G_IO_ERROR_PENDING is returned
2238 * and the user can be notified of the connection finishing by waiting
2239 * for the G_IO_OUT condition. The result of the connection must then be
2240 * checked with g_socket_check_connect_result().
2242 * Returns: %TRUE if connected, %FALSE on error.
2247 g_socket_connect (GSocket *socket,
2248 GSocketAddress *address,
2249 GCancellable *cancellable,
2252 struct sockaddr_storage buffer;
2254 g_return_val_if_fail (G_IS_SOCKET (socket) && G_IS_SOCKET_ADDRESS (address), FALSE);
2256 if (!check_socket (socket, error))
2259 if (!g_socket_address_to_native (address, &buffer, sizeof buffer, error))
2262 if (socket->priv->remote_address)
2263 g_object_unref (socket->priv->remote_address);
2264 socket->priv->remote_address = g_object_ref (address);
2268 if (connect (socket->priv->fd, (struct sockaddr *) &buffer,
2269 g_socket_address_get_native_size (address)) < 0)
2271 int errsv = get_socket_errno ();
2277 if (errsv == EINPROGRESS)
2279 if (errsv == WSAEWOULDBLOCK)
2282 if (socket->priv->blocking)
2284 if (g_socket_condition_wait (socket, G_IO_OUT, cancellable, error))
2286 if (g_socket_check_connect_result (socket, error))
2292 g_set_error_literal (error, G_IO_ERROR, G_IO_ERROR_PENDING,
2293 _("Connection in progress"));
2294 socket->priv->connect_pending = TRUE;
2298 g_set_error_literal (error, G_IO_ERROR,
2299 socket_io_error_from_errno (errsv),
2300 socket_strerror (errsv));
2307 win32_unset_event_mask (socket, FD_CONNECT);
2309 socket->priv->connected = TRUE;
2315 * g_socket_check_connect_result:
2316 * @socket: a #GSocket
2317 * @error: #GError for error reporting, or %NULL to ignore.
2319 * Checks and resets the pending connect error for the socket.
2320 * This is used to check for errors when g_socket_connect() is
2321 * used in non-blocking mode.
2323 * Returns: %TRUE if no error, %FALSE otherwise, setting @error to the error
2328 g_socket_check_connect_result (GSocket *socket,
2334 g_return_val_if_fail (G_IS_SOCKET (socket), FALSE);
2336 if (!check_socket (socket, error))
2339 optlen = sizeof (value);
2340 if (getsockopt (socket->priv->fd, SOL_SOCKET, SO_ERROR, (void *)&value, &optlen) != 0)
2342 int errsv = get_socket_errno ();
2344 g_set_error (error, G_IO_ERROR, socket_io_error_from_errno (errsv),
2345 _("Unable to get pending error: %s"), socket_strerror (errsv));
2351 g_set_error_literal (error, G_IO_ERROR, socket_io_error_from_errno (value),
2352 socket_strerror (value));
2353 if (socket->priv->remote_address)
2355 g_object_unref (socket->priv->remote_address);
2356 socket->priv->remote_address = NULL;
2361 socket->priv->connected = TRUE;
2366 * g_socket_get_available_bytes:
2367 * @socket: a #GSocket
2369 * Get the amount of data pending in the OS input buffer.
2371 * Returns: the number of bytes that can be read from the socket
2372 * without blocking or -1 on error.
2377 g_socket_get_available_bytes (GSocket *socket)
2385 g_return_val_if_fail (G_IS_SOCKET (socket), -1);
2388 if (ioctl (socket->priv->fd, FIONREAD, &avail) < 0)
2391 if (ioctlsocket (socket->priv->fd, FIONREAD, &avail) == SOCKET_ERROR)
2400 * @socket: a #GSocket
2401 * @buffer: a buffer to read data into (which should be at least @size
2403 * @size: the number of bytes you want to read from the socket
2404 * @cancellable: (allow-none): a %GCancellable or %NULL
2405 * @error: #GError for error reporting, or %NULL to ignore.
2407 * Receive data (up to @size bytes) from a socket. This is mainly used by
2408 * connection-oriented sockets; it is identical to g_socket_receive_from()
2409 * with @address set to %NULL.
2411 * For %G_SOCKET_TYPE_DATAGRAM and %G_SOCKET_TYPE_SEQPACKET sockets,
2412 * g_socket_receive() will always read either 0 or 1 complete messages from
2413 * the socket. If the received message is too large to fit in @buffer, then
2414 * the data beyond @size bytes will be discarded, without any explicit
2415 * indication that this has occurred.
2417 * For %G_SOCKET_TYPE_STREAM sockets, g_socket_receive() can return any
2418 * number of bytes, up to @size. If more than @size bytes have been
2419 * received, the additional data will be returned in future calls to
2420 * g_socket_receive().
2422 * If the socket is in blocking mode the call will block until there
2423 * is some data to receive, the connection is closed, or there is an
2424 * error. If there is no data available and the socket is in
2425 * non-blocking mode, a %G_IO_ERROR_WOULD_BLOCK error will be
2426 * returned. To be notified when data is available, wait for the
2427 * %G_IO_IN condition.
2429 * On error -1 is returned and @error is set accordingly.
2431 * Returns: Number of bytes read, or 0 if the connection was closed by
2432 * the peer, or -1 on error
2437 g_socket_receive (GSocket *socket,
2440 GCancellable *cancellable,
2443 return g_socket_receive_with_blocking (socket, buffer, size,
2444 socket->priv->blocking,
2445 cancellable, error);
2449 * g_socket_receive_with_blocking:
2450 * @socket: a #GSocket
2451 * @buffer: a buffer to read data into (which should be at least @size
2453 * @size: the number of bytes you want to read from the socket
2454 * @blocking: whether to do blocking or non-blocking I/O
2455 * @cancellable: (allow-none): a %GCancellable or %NULL
2456 * @error: #GError for error reporting, or %NULL to ignore.
2458 * This behaves exactly the same as g_socket_receive(), except that
2459 * the choice of blocking or non-blocking behavior is determined by
2460 * the @blocking argument rather than by @socket's properties.
2462 * Returns: Number of bytes read, or 0 if the connection was closed by
2463 * the peer, or -1 on error
2468 g_socket_receive_with_blocking (GSocket *socket,
2472 GCancellable *cancellable,
2477 g_return_val_if_fail (G_IS_SOCKET (socket) && buffer != NULL, -1);
2479 if (!check_socket (socket, error))
2482 if (g_cancellable_set_error_if_cancelled (cancellable, error))
2488 !g_socket_condition_wait (socket,
2489 G_IO_IN, cancellable, error))
2492 if ((ret = recv (socket->priv->fd, buffer, size, 0)) < 0)
2494 int errsv = get_socket_errno ();
2501 #ifdef WSAEWOULDBLOCK
2502 if (errsv == WSAEWOULDBLOCK)
2505 if (errsv == EWOULDBLOCK ||
2511 win32_unset_event_mask (socket, FD_READ);
2513 g_set_error (error, G_IO_ERROR,
2514 socket_io_error_from_errno (errsv),
2515 _("Error receiving data: %s"), socket_strerror (errsv));
2519 win32_unset_event_mask (socket, FD_READ);
2528 * g_socket_receive_from:
2529 * @socket: a #GSocket
2530 * @address: (out) (allow-none): a pointer to a #GSocketAddress
2532 * @buffer: (array length=size) (element-type guint8): a buffer to
2533 * read data into (which should be at least @size bytes long).
2534 * @size: the number of bytes you want to read from the socket
2535 * @cancellable: (allow-none): a %GCancellable or %NULL
2536 * @error: #GError for error reporting, or %NULL to ignore.
2538 * Receive data (up to @size bytes) from a socket.
2540 * If @address is non-%NULL then @address will be set equal to the
2541 * source address of the received packet.
2542 * @address is owned by the caller.
2544 * See g_socket_receive() for additional information.
2546 * Returns: Number of bytes read, or 0 if the connection was closed by
2547 * the peer, or -1 on error
2552 g_socket_receive_from (GSocket *socket,
2553 GSocketAddress **address,
2556 GCancellable *cancellable,
2564 return g_socket_receive_message (socket,
2572 /* Although we ignore SIGPIPE, gdb will still stop if the app receives
2573 * one, which can be confusing and annoying. So if possible, we want
2574 * to suppress the signal entirely.
2577 #define G_SOCKET_DEFAULT_SEND_FLAGS MSG_NOSIGNAL
2579 #define G_SOCKET_DEFAULT_SEND_FLAGS 0
2584 * @socket: a #GSocket
2585 * @buffer: (array length=size) (element-type guint8): the buffer
2586 * containing the data to send.
2587 * @size: the number of bytes to send
2588 * @cancellable: (allow-none): a %GCancellable or %NULL
2589 * @error: #GError for error reporting, or %NULL to ignore.
2591 * Tries to send @size bytes from @buffer on the socket. This is
2592 * mainly used by connection-oriented sockets; it is identical to
2593 * g_socket_send_to() with @address set to %NULL.
2595 * If the socket is in blocking mode the call will block until there is
2596 * space for the data in the socket queue. If there is no space available
2597 * and the socket is in non-blocking mode a %G_IO_ERROR_WOULD_BLOCK error
2598 * will be returned. To be notified when space is available, wait for the
2599 * %G_IO_OUT condition. Note though that you may still receive
2600 * %G_IO_ERROR_WOULD_BLOCK from g_socket_send() even if you were previously
2601 * notified of a %G_IO_OUT condition. (On Windows in particular, this is
2602 * very common due to the way the underlying APIs work.)
2604 * On error -1 is returned and @error is set accordingly.
2606 * Returns: Number of bytes written (which may be less than @size), or -1
2612 g_socket_send (GSocket *socket,
2613 const gchar *buffer,
2615 GCancellable *cancellable,
2618 return g_socket_send_with_blocking (socket, buffer, size,
2619 socket->priv->blocking,
2620 cancellable, error);
2624 * g_socket_send_with_blocking:
2625 * @socket: a #GSocket
2626 * @buffer: (array length=size) (element-type guint8): the buffer
2627 * containing the data to send.
2628 * @size: the number of bytes to send
2629 * @blocking: whether to do blocking or non-blocking I/O
2630 * @cancellable: (allow-none): a %GCancellable or %NULL
2631 * @error: #GError for error reporting, or %NULL to ignore.
2633 * This behaves exactly the same as g_socket_send(), except that
2634 * the choice of blocking or non-blocking behavior is determined by
2635 * the @blocking argument rather than by @socket's properties.
2637 * Returns: Number of bytes written (which may be less than @size), or -1
2643 g_socket_send_with_blocking (GSocket *socket,
2644 const gchar *buffer,
2647 GCancellable *cancellable,
2652 g_return_val_if_fail (G_IS_SOCKET (socket) && buffer != NULL, -1);
2654 if (!check_socket (socket, error))
2657 if (g_cancellable_set_error_if_cancelled (cancellable, error))
2663 !g_socket_condition_wait (socket,
2664 G_IO_OUT, cancellable, error))
2667 if ((ret = send (socket->priv->fd, buffer, size, G_SOCKET_DEFAULT_SEND_FLAGS)) < 0)
2669 int errsv = get_socket_errno ();
2674 #ifdef WSAEWOULDBLOCK
2675 if (errsv == WSAEWOULDBLOCK)
2676 win32_unset_event_mask (socket, FD_WRITE);
2681 #ifdef WSAEWOULDBLOCK
2682 if (errsv == WSAEWOULDBLOCK)
2685 if (errsv == EWOULDBLOCK ||
2691 g_set_error (error, G_IO_ERROR,
2692 socket_io_error_from_errno (errsv),
2693 _("Error sending data: %s"), socket_strerror (errsv));
2704 * @socket: a #GSocket
2705 * @address: (allow-none): a #GSocketAddress, or %NULL
2706 * @buffer: (array length=size) (element-type guint8): the buffer
2707 * containing the data to send.
2708 * @size: the number of bytes to send
2709 * @cancellable: (allow-none): a %GCancellable or %NULL
2710 * @error: #GError for error reporting, or %NULL to ignore.
2712 * Tries to send @size bytes from @buffer to @address. If @address is
2713 * %NULL then the message is sent to the default receiver (set by
2714 * g_socket_connect()).
2716 * See g_socket_send() for additional information.
2718 * Returns: Number of bytes written (which may be less than @size), or -1
2724 g_socket_send_to (GSocket *socket,
2725 GSocketAddress *address,
2726 const gchar *buffer,
2728 GCancellable *cancellable,
2736 return g_socket_send_message (socket,
2746 * g_socket_shutdown:
2747 * @socket: a #GSocket
2748 * @shutdown_read: whether to shut down the read side
2749 * @shutdown_write: whether to shut down the write side
2750 * @error: #GError for error reporting, or %NULL to ignore.
2752 * Shut down part of a full-duplex connection.
2754 * If @shutdown_read is %TRUE then the receiving side of the connection
2755 * is shut down, and further reading is disallowed.
2757 * If @shutdown_write is %TRUE then the sending side of the connection
2758 * is shut down, and further writing is disallowed.
2760 * It is allowed for both @shutdown_read and @shutdown_write to be %TRUE.
2762 * One example where this is used is graceful disconnect for TCP connections
2763 * where you close the sending side, then wait for the other side to close
2764 * the connection, thus ensuring that the other side saw all sent data.
2766 * Returns: %TRUE on success, %FALSE on error
2771 g_socket_shutdown (GSocket *socket,
2772 gboolean shutdown_read,
2773 gboolean shutdown_write,
2778 g_return_val_if_fail (G_IS_SOCKET (socket), TRUE);
2780 if (!check_socket (socket, error))
2784 if (!shutdown_read && !shutdown_write)
2788 if (shutdown_read && shutdown_write)
2790 else if (shutdown_read)
2795 if (shutdown_read && shutdown_write)
2797 else if (shutdown_read)
2803 if (shutdown (socket->priv->fd, how) != 0)
2805 int errsv = get_socket_errno ();
2806 g_set_error (error, G_IO_ERROR, socket_io_error_from_errno (errsv),
2807 _("Unable to shutdown socket: %s"), socket_strerror (errsv));
2811 if (shutdown_read && shutdown_write)
2812 socket->priv->connected = FALSE;
2819 * @socket: a #GSocket
2820 * @error: #GError for error reporting, or %NULL to ignore.
2822 * Closes the socket, shutting down any active connection.
2824 * Closing a socket does not wait for all outstanding I/O operations
2825 * to finish, so the caller should not rely on them to be guaranteed
2826 * to complete even if the close returns with no error.
2828 * Once the socket is closed, all other operations will return
2829 * %G_IO_ERROR_CLOSED. Closing a socket multiple times will not
2832 * Sockets will be automatically closed when the last reference
2833 * is dropped, but you might want to call this function to make sure
2834 * resources are released as early as possible.
2836 * Beware that due to the way that TCP works, it is possible for
2837 * recently-sent data to be lost if either you close a socket while the
2838 * %G_IO_IN condition is set, or else if the remote connection tries to
2839 * send something to you after you close the socket but before it has
2840 * finished reading all of the data you sent. There is no easy generic
2841 * way to avoid this problem; the easiest fix is to design the network
2842 * protocol such that the client will never send data "out of turn".
2843 * Another solution is for the server to half-close the connection by
2844 * calling g_socket_shutdown() with only the @shutdown_write flag set,
2845 * and then wait for the client to notice this and close its side of the
2846 * connection, after which the server can safely call g_socket_close().
2847 * (This is what #GTcpConnection does if you call
2848 * g_tcp_connection_set_graceful_disconnect(). But of course, this
2849 * only works if the client will close its connection after the server
2852 * Returns: %TRUE on success, %FALSE on error
2857 g_socket_close (GSocket *socket,
2862 g_return_val_if_fail (G_IS_SOCKET (socket), TRUE);
2864 if (socket->priv->closed)
2865 return TRUE; /* Multiple close not an error */
2867 if (!check_socket (socket, error))
2873 res = closesocket (socket->priv->fd);
2875 res = close (socket->priv->fd);
2879 int errsv = get_socket_errno ();
2884 g_set_error (error, G_IO_ERROR,
2885 socket_io_error_from_errno (errsv),
2886 _("Error closing socket: %s"),
2887 socket_strerror (errsv));
2893 socket->priv->connected = FALSE;
2894 socket->priv->closed = TRUE;
2895 if (socket->priv->remote_address)
2897 g_object_unref (socket->priv->remote_address);
2898 socket->priv->remote_address = NULL;
2905 * g_socket_is_closed:
2906 * @socket: a #GSocket
2908 * Checks whether a socket is closed.
2910 * Returns: %TRUE if socket is closed, %FALSE otherwise
2915 g_socket_is_closed (GSocket *socket)
2917 return socket->priv->closed;
2921 /* Broken source, used on errors */
2923 broken_prepare (GSource *source,
2930 broken_check (GSource *source)
2936 broken_dispatch (GSource *source,
2937 GSourceFunc callback,
2943 static GSourceFuncs broken_funcs =
2952 network_events_for_condition (GIOCondition condition)
2956 if (condition & G_IO_IN)
2957 event_mask |= (FD_READ | FD_ACCEPT);
2958 if (condition & G_IO_OUT)
2959 event_mask |= (FD_WRITE | FD_CONNECT);
2960 event_mask |= FD_CLOSE;
2966 ensure_event (GSocket *socket)
2968 if (socket->priv->event == WSA_INVALID_EVENT)
2969 socket->priv->event = WSACreateEvent();
2973 update_select_events (GSocket *socket)
2980 ensure_event (socket);
2983 for (l = socket->priv->requested_conditions; l != NULL; l = l->next)
2986 event_mask |= network_events_for_condition (*ptr);
2989 if (event_mask != socket->priv->selected_events)
2991 /* If no events selected, disable event so we can unset
2994 if (event_mask == 0)
2997 event = socket->priv->event;
2999 if (WSAEventSelect (socket->priv->fd, event, event_mask) == 0)
3000 socket->priv->selected_events = event_mask;
3005 add_condition_watch (GSocket *socket,
3006 GIOCondition *condition)
3008 g_assert (g_list_find (socket->priv->requested_conditions, condition) == NULL);
3010 socket->priv->requested_conditions =
3011 g_list_prepend (socket->priv->requested_conditions, condition);
3013 update_select_events (socket);
3017 remove_condition_watch (GSocket *socket,
3018 GIOCondition *condition)
3020 g_assert (g_list_find (socket->priv->requested_conditions, condition) != NULL);
3022 socket->priv->requested_conditions =
3023 g_list_remove (socket->priv->requested_conditions, condition);
3025 update_select_events (socket);
3029 update_condition (GSocket *socket)
3031 WSANETWORKEVENTS events;
3032 GIOCondition condition;
3034 if (WSAEnumNetworkEvents (socket->priv->fd,
3035 socket->priv->event,
3038 socket->priv->current_events |= events.lNetworkEvents;
3039 if (events.lNetworkEvents & FD_WRITE &&
3040 events.iErrorCode[FD_WRITE_BIT] != 0)
3041 socket->priv->current_errors |= FD_WRITE;
3042 if (events.lNetworkEvents & FD_CONNECT &&
3043 events.iErrorCode[FD_CONNECT_BIT] != 0)
3044 socket->priv->current_errors |= FD_CONNECT;
3048 if (socket->priv->current_events & (FD_READ | FD_ACCEPT))
3049 condition |= G_IO_IN;
3051 if (socket->priv->current_events & FD_CLOSE)
3053 int r, errsv, buffer;
3055 r = recv (socket->priv->fd, &buffer, sizeof (buffer), MSG_PEEK);
3057 errsv = get_socket_errno ();
3060 (r < 0 && errsv == WSAENOTCONN))
3061 condition |= G_IO_IN;
3063 (r < 0 && (errsv == WSAESHUTDOWN || errsv == WSAECONNRESET ||
3064 errsv == WSAECONNABORTED || errsv == WSAENETRESET)))
3065 condition |= G_IO_HUP;
3067 condition |= G_IO_ERR;
3070 if (socket->priv->closed)
3071 condition |= G_IO_HUP;
3073 /* Never report both G_IO_OUT and HUP, these are
3074 mutually exclusive (can't write to a closed socket) */
3075 if ((condition & G_IO_HUP) == 0 &&
3076 socket->priv->current_events & FD_WRITE)
3078 if (socket->priv->current_errors & FD_WRITE)
3079 condition |= G_IO_ERR;
3081 condition |= G_IO_OUT;
3085 if (socket->priv->current_events & FD_CONNECT)
3087 if (socket->priv->current_errors & FD_CONNECT)
3088 condition |= (G_IO_HUP | G_IO_ERR);
3090 condition |= G_IO_OUT;
3102 GIOCondition condition;
3103 GCancellable *cancellable;
3104 GPollFD cancel_pollfd;
3105 gint64 timeout_time;
3109 socket_source_prepare (GSource *source,
3112 GSocketSource *socket_source = (GSocketSource *)source;
3114 if (g_cancellable_is_cancelled (socket_source->cancellable))
3117 if (socket_source->timeout_time)
3121 now = g_source_get_time (source);
3122 /* Round up to ensure that we don't try again too early */
3123 *timeout = (socket_source->timeout_time - now + 999) / 1000;
3126 socket_source->socket->priv->timed_out = TRUE;
3135 socket_source->pollfd.revents = update_condition (socket_source->socket);
3138 if ((socket_source->condition & socket_source->pollfd.revents) != 0)
3145 socket_source_check (GSource *source)
3149 return socket_source_prepare (source, &timeout);
3153 socket_source_dispatch (GSource *source,
3154 GSourceFunc callback,
3157 GSocketSourceFunc func = (GSocketSourceFunc)callback;
3158 GSocketSource *socket_source = (GSocketSource *)source;
3159 GSocket *socket = socket_source->socket;
3163 socket_source->pollfd.revents = update_condition (socket_source->socket);
3165 if (socket_source->socket->priv->timed_out)
3166 socket_source->pollfd.revents |= socket_source->condition & (G_IO_IN | G_IO_OUT);
3168 ret = (*func) (socket,
3169 socket_source->pollfd.revents & socket_source->condition,
3172 if (socket->priv->timeout)
3173 socket_source->timeout_time = g_get_monotonic_time () +
3174 socket->priv->timeout * 1000000;
3177 socket_source->timeout_time = 0;
3183 socket_source_finalize (GSource *source)
3185 GSocketSource *socket_source = (GSocketSource *)source;
3188 socket = socket_source->socket;
3191 remove_condition_watch (socket, &socket_source->condition);
3194 g_object_unref (socket);
3196 if (socket_source->cancellable)
3198 g_cancellable_release_fd (socket_source->cancellable);
3199 g_object_unref (socket_source->cancellable);
3204 socket_source_closure_callback (GSocket *socket,
3205 GIOCondition condition,
3208 GClosure *closure = data;
3210 GValue params[2] = { G_VALUE_INIT, G_VALUE_INIT };
3211 GValue result_value = G_VALUE_INIT;
3214 g_value_init (&result_value, G_TYPE_BOOLEAN);
3216 g_value_init (¶ms[0], G_TYPE_SOCKET);
3217 g_value_set_object (¶ms[0], socket);
3218 g_value_init (¶ms[1], G_TYPE_IO_CONDITION);
3219 g_value_set_flags (¶ms[1], condition);
3221 g_closure_invoke (closure, &result_value, 2, params, NULL);
3223 result = g_value_get_boolean (&result_value);
3224 g_value_unset (&result_value);
3225 g_value_unset (¶ms[0]);
3226 g_value_unset (¶ms[1]);
3231 static GSourceFuncs socket_source_funcs =
3233 socket_source_prepare,
3234 socket_source_check,
3235 socket_source_dispatch,
3236 socket_source_finalize,
3237 (GSourceFunc)socket_source_closure_callback,
3238 (GSourceDummyMarshal)g_cclosure_marshal_generic,
3242 socket_source_new (GSocket *socket,
3243 GIOCondition condition,
3244 GCancellable *cancellable)
3247 GSocketSource *socket_source;
3250 ensure_event (socket);
3252 if (socket->priv->event == WSA_INVALID_EVENT)
3254 g_warning ("Failed to create WSAEvent");
3255 return g_source_new (&broken_funcs, sizeof (GSource));
3259 condition |= G_IO_HUP | G_IO_ERR;
3261 source = g_source_new (&socket_source_funcs, sizeof (GSocketSource));
3262 g_source_set_name (source, "GSocket");
3263 socket_source = (GSocketSource *)source;
3265 socket_source->socket = g_object_ref (socket);
3266 socket_source->condition = condition;
3268 if (g_cancellable_make_pollfd (cancellable,
3269 &socket_source->cancel_pollfd))
3271 socket_source->cancellable = g_object_ref (cancellable);
3272 g_source_add_poll (source, &socket_source->cancel_pollfd);
3276 add_condition_watch (socket, &socket_source->condition);
3277 socket_source->pollfd.fd = (gintptr) socket->priv->event;
3279 socket_source->pollfd.fd = socket->priv->fd;
3282 socket_source->pollfd.events = condition;
3283 socket_source->pollfd.revents = 0;
3284 g_source_add_poll (source, &socket_source->pollfd);
3286 if (socket->priv->timeout)
3287 socket_source->timeout_time = g_get_monotonic_time () +
3288 socket->priv->timeout * 1000000;
3291 socket_source->timeout_time = 0;
3297 * g_socket_create_source: (skip)
3298 * @socket: a #GSocket
3299 * @condition: a #GIOCondition mask to monitor
3300 * @cancellable: (allow-none): a %GCancellable or %NULL
3302 * Creates a %GSource that can be attached to a %GMainContext to monitor
3303 * for the availibility of the specified @condition on the socket.
3305 * The callback on the source is of the #GSocketSourceFunc type.
3307 * It is meaningless to specify %G_IO_ERR or %G_IO_HUP in @condition;
3308 * these conditions will always be reported output if they are true.
3310 * @cancellable if not %NULL can be used to cancel the source, which will
3311 * cause the source to trigger, reporting the current condition (which
3312 * is likely 0 unless cancellation happened at the same time as a
3313 * condition change). You can check for this in the callback using
3314 * g_cancellable_is_cancelled().
3316 * If @socket has a timeout set, and it is reached before @condition
3317 * occurs, the source will then trigger anyway, reporting %G_IO_IN or
3318 * %G_IO_OUT depending on @condition. However, @socket will have been
3319 * marked as having had a timeout, and so the next #GSocket I/O method
3320 * you call will then fail with a %G_IO_ERROR_TIMED_OUT.
3322 * Returns: (transfer full): a newly allocated %GSource, free with g_source_unref().
3327 g_socket_create_source (GSocket *socket,
3328 GIOCondition condition,
3329 GCancellable *cancellable)
3331 g_return_val_if_fail (G_IS_SOCKET (socket) && (cancellable == NULL || G_IS_CANCELLABLE (cancellable)), NULL);
3333 return socket_source_new (socket, condition, cancellable);
3337 * g_socket_condition_check:
3338 * @socket: a #GSocket
3339 * @condition: a #GIOCondition mask to check
3341 * Checks on the readiness of @socket to perform operations.
3342 * The operations specified in @condition are checked for and masked
3343 * against the currently-satisfied conditions on @socket. The result
3346 * Note that on Windows, it is possible for an operation to return
3347 * %G_IO_ERROR_WOULD_BLOCK even immediately after
3348 * g_socket_condition_check() has claimed that the socket is ready for
3349 * writing. Rather than calling g_socket_condition_check() and then
3350 * writing to the socket if it succeeds, it is generally better to
3351 * simply try writing to the socket right away, and try again later if
3352 * the initial attempt returns %G_IO_ERROR_WOULD_BLOCK.
3354 * It is meaningless to specify %G_IO_ERR or %G_IO_HUP in condition;
3355 * these conditions will always be set in the output if they are true.
3357 * This call never blocks.
3359 * Returns: the @GIOCondition mask of the current state
3364 g_socket_condition_check (GSocket *socket,
3365 GIOCondition condition)
3367 g_return_val_if_fail (G_IS_SOCKET (socket), 0);
3369 if (!check_socket (socket, NULL))
3374 GIOCondition current_condition;
3376 condition |= G_IO_ERR | G_IO_HUP;
3378 add_condition_watch (socket, &condition);
3379 current_condition = update_condition (socket);
3380 remove_condition_watch (socket, &condition);
3381 return condition & current_condition;
3387 poll_fd.fd = socket->priv->fd;
3388 poll_fd.events = condition;
3391 result = g_poll (&poll_fd, 1, 0);
3392 while (result == -1 && get_socket_errno () == EINTR);
3394 return poll_fd.revents;
3400 * g_socket_condition_wait:
3401 * @socket: a #GSocket
3402 * @condition: a #GIOCondition mask to wait for
3403 * @cancellable: (allow-none): a #GCancellable, or %NULL
3404 * @error: a #GError pointer, or %NULL
3406 * Waits for @condition to become true on @socket. When the condition
3407 * is met, %TRUE is returned.
3409 * If @cancellable is cancelled before the condition is met, or if the
3410 * socket has a timeout set and it is reached before the condition is
3411 * met, then %FALSE is returned and @error, if non-%NULL, is set to
3412 * the appropriate value (%G_IO_ERROR_CANCELLED or
3413 * %G_IO_ERROR_TIMED_OUT).
3415 * See also g_socket_condition_timed_wait().
3417 * Returns: %TRUE if the condition was met, %FALSE otherwise
3422 g_socket_condition_wait (GSocket *socket,
3423 GIOCondition condition,
3424 GCancellable *cancellable,
3427 g_return_val_if_fail (G_IS_SOCKET (socket), FALSE);
3429 return g_socket_condition_timed_wait (socket, condition, -1,
3430 cancellable, error);
3434 * g_socket_condition_timed_wait:
3435 * @socket: a #GSocket
3436 * @condition: a #GIOCondition mask to wait for
3437 * @timeout: the maximum time (in microseconds) to wait, or -1
3438 * @cancellable: (allow-none): a #GCancellable, or %NULL
3439 * @error: a #GError pointer, or %NULL
3441 * Waits for up to @timeout microseconds for @condition to become true
3442 * on @socket. If the condition is met, %TRUE is returned.
3444 * If @cancellable is cancelled before the condition is met, or if
3445 * @timeout (or the socket's #GSocket:timeout) is reached before the
3446 * condition is met, then %FALSE is returned and @error, if non-%NULL,
3447 * is set to the appropriate value (%G_IO_ERROR_CANCELLED or
3448 * %G_IO_ERROR_TIMED_OUT).
3450 * If you don't want a timeout, use g_socket_condition_wait().
3451 * (Alternatively, you can pass -1 for @timeout.)
3453 * Note that although @timeout is in microseconds for consistency with
3454 * other GLib APIs, this function actually only has millisecond
3455 * resolution, and the behavior is undefined if @timeout is not an
3456 * exact number of milliseconds.
3458 * Returns: %TRUE if the condition was met, %FALSE otherwise
3463 g_socket_condition_timed_wait (GSocket *socket,
3464 GIOCondition condition,
3466 GCancellable *cancellable,
3471 g_return_val_if_fail (G_IS_SOCKET (socket), FALSE);
3473 if (!check_socket (socket, error))
3476 if (g_cancellable_set_error_if_cancelled (cancellable, error))
3479 if (socket->priv->timeout &&
3480 (timeout < 0 || socket->priv->timeout < timeout / G_USEC_PER_SEC))
3481 timeout = socket->priv->timeout * 1000;
3482 else if (timeout != -1)
3483 timeout = timeout / 1000;
3485 start_time = g_get_monotonic_time ();
3489 GIOCondition current_condition;
3495 /* Always check these */
3496 condition |= G_IO_ERR | G_IO_HUP;
3498 add_condition_watch (socket, &condition);
3501 events[num_events++] = socket->priv->event;
3503 if (g_cancellable_make_pollfd (cancellable, &cancel_fd))
3504 events[num_events++] = (WSAEVENT)cancel_fd.fd;
3507 timeout = WSA_INFINITE;
3509 current_condition = update_condition (socket);
3510 while ((condition & current_condition) == 0)
3512 res = WSAWaitForMultipleEvents (num_events, events,
3513 FALSE, timeout, FALSE);
3514 if (res == WSA_WAIT_FAILED)
3516 int errsv = get_socket_errno ();
3518 g_set_error (error, G_IO_ERROR,
3519 socket_io_error_from_errno (errsv),
3520 _("Waiting for socket condition: %s"),
3521 socket_strerror (errsv));
3524 else if (res == WSA_WAIT_TIMEOUT)
3526 g_set_error_literal (error, G_IO_ERROR, G_IO_ERROR_TIMED_OUT,
3527 _("Socket I/O timed out"));
3531 if (g_cancellable_set_error_if_cancelled (cancellable, error))
3534 current_condition = update_condition (socket);
3536 if (timeout != WSA_INFINITE)
3538 timeout -= (g_get_monotonic_time () - start_time) * 1000;
3543 remove_condition_watch (socket, &condition);
3545 g_cancellable_release_fd (cancellable);
3547 return (condition & current_condition) != 0;
3555 poll_fd[0].fd = socket->priv->fd;
3556 poll_fd[0].events = condition;
3559 if (g_cancellable_make_pollfd (cancellable, &poll_fd[1]))
3564 result = g_poll (poll_fd, num, timeout);
3565 if (result != -1 || errno != EINTR)
3570 timeout -= (g_get_monotonic_time () - start_time) * 1000;
3577 g_cancellable_release_fd (cancellable);
3581 g_set_error_literal (error, G_IO_ERROR, G_IO_ERROR_TIMED_OUT,
3582 _("Socket I/O timed out"));
3586 return !g_cancellable_set_error_if_cancelled (cancellable, error);
3592 * g_socket_send_message:
3593 * @socket: a #GSocket
3594 * @address: (allow-none): a #GSocketAddress, or %NULL
3595 * @vectors: (array length=num_vectors): an array of #GOutputVector structs
3596 * @num_vectors: the number of elements in @vectors, or -1
3597 * @messages: (array length=num_messages) (allow-none): a pointer to an
3598 * array of #GSocketControlMessages, or %NULL.
3599 * @num_messages: number of elements in @messages, or -1.
3600 * @flags: an int containing #GSocketMsgFlags flags
3601 * @cancellable: (allow-none): a %GCancellable or %NULL
3602 * @error: #GError for error reporting, or %NULL to ignore.
3604 * Send data to @address on @socket. This is the most complicated and
3605 * fully-featured version of this call. For easier use, see
3606 * g_socket_send() and g_socket_send_to().
3608 * If @address is %NULL then the message is sent to the default receiver
3609 * (set by g_socket_connect()).
3611 * @vectors must point to an array of #GOutputVector structs and
3612 * @num_vectors must be the length of this array. (If @num_vectors is -1,
3613 * then @vectors is assumed to be terminated by a #GOutputVector with a
3614 * %NULL buffer pointer.) The #GOutputVector structs describe the buffers
3615 * that the sent data will be gathered from. Using multiple
3616 * #GOutputVector<!-- -->s is more memory-efficient than manually copying
3617 * data from multiple sources into a single buffer, and more
3618 * network-efficient than making multiple calls to g_socket_send().
3620 * @messages, if non-%NULL, is taken to point to an array of @num_messages
3621 * #GSocketControlMessage instances. These correspond to the control
3622 * messages to be sent on the socket.
3623 * If @num_messages is -1 then @messages is treated as a %NULL-terminated
3626 * @flags modify how the message is sent. The commonly available arguments
3627 * for this are available in the #GSocketMsgFlags enum, but the
3628 * values there are the same as the system values, and the flags
3629 * are passed in as-is, so you can pass in system-specific flags too.
3631 * If the socket is in blocking mode the call will block until there is
3632 * space for the data in the socket queue. If there is no space available
3633 * and the socket is in non-blocking mode a %G_IO_ERROR_WOULD_BLOCK error
3634 * will be returned. To be notified when space is available, wait for the
3635 * %G_IO_OUT condition. Note though that you may still receive
3636 * %G_IO_ERROR_WOULD_BLOCK from g_socket_send() even if you were previously
3637 * notified of a %G_IO_OUT condition. (On Windows in particular, this is
3638 * very common due to the way the underlying APIs work.)
3640 * On error -1 is returned and @error is set accordingly.
3642 * Returns: Number of bytes written (which may be less than @size), or -1
3648 g_socket_send_message (GSocket *socket,
3649 GSocketAddress *address,
3650 GOutputVector *vectors,
3652 GSocketControlMessage **messages,
3655 GCancellable *cancellable,
3658 GOutputVector one_vector;
3661 g_return_val_if_fail (G_IS_SOCKET (socket), -1);
3663 if (!check_socket (socket, error))
3666 if (g_cancellable_set_error_if_cancelled (cancellable, error))
3669 if (num_vectors == -1)
3671 for (num_vectors = 0;
3672 vectors[num_vectors].buffer != NULL;
3677 if (num_messages == -1)
3679 for (num_messages = 0;
3680 messages != NULL && messages[num_messages] != NULL;
3685 if (num_vectors == 0)
3689 one_vector.buffer = &zero;
3690 one_vector.size = 1;
3692 vectors = &one_vector;
3705 msg.msg_namelen = g_socket_address_get_native_size (address);
3706 msg.msg_name = g_alloca (msg.msg_namelen);
3707 if (!g_socket_address_to_native (address, msg.msg_name, msg.msg_namelen, error))
3712 msg.msg_name = NULL;
3713 msg.msg_namelen = 0;
3718 /* this entire expression will be evaluated at compile time */
3719 if (sizeof *msg.msg_iov == sizeof *vectors &&
3720 sizeof msg.msg_iov->iov_base == sizeof vectors->buffer &&
3721 G_STRUCT_OFFSET (struct iovec, iov_base) ==
3722 G_STRUCT_OFFSET (GOutputVector, buffer) &&
3723 sizeof msg.msg_iov->iov_len == sizeof vectors->size &&
3724 G_STRUCT_OFFSET (struct iovec, iov_len) ==
3725 G_STRUCT_OFFSET (GOutputVector, size))
3726 /* ABI is compatible */
3728 msg.msg_iov = (struct iovec *) vectors;
3729 msg.msg_iovlen = num_vectors;
3732 /* ABI is incompatible */
3736 msg.msg_iov = g_newa (struct iovec, num_vectors);
3737 for (i = 0; i < num_vectors; i++)
3739 msg.msg_iov[i].iov_base = (void *) vectors[i].buffer;
3740 msg.msg_iov[i].iov_len = vectors[i].size;
3742 msg.msg_iovlen = num_vectors;
3748 struct cmsghdr *cmsg;
3751 msg.msg_controllen = 0;
3752 for (i = 0; i < num_messages; i++)
3753 msg.msg_controllen += CMSG_SPACE (g_socket_control_message_get_size (messages[i]));
3755 if (msg.msg_controllen == 0)
3756 msg.msg_control = NULL;
3759 msg.msg_control = g_alloca (msg.msg_controllen);
3760 memset (msg.msg_control, '\0', msg.msg_controllen);
3763 cmsg = CMSG_FIRSTHDR (&msg);
3764 for (i = 0; i < num_messages; i++)
3766 cmsg->cmsg_level = g_socket_control_message_get_level (messages[i]);
3767 cmsg->cmsg_type = g_socket_control_message_get_msg_type (messages[i]);
3768 cmsg->cmsg_len = CMSG_LEN (g_socket_control_message_get_size (messages[i]));
3769 g_socket_control_message_serialize (messages[i],
3771 cmsg = CMSG_NXTHDR (&msg, cmsg);
3773 g_assert (cmsg == NULL);
3778 if (socket->priv->blocking &&
3779 !g_socket_condition_wait (socket,
3780 G_IO_OUT, cancellable, error))
3783 result = sendmsg (socket->priv->fd, &msg, flags | G_SOCKET_DEFAULT_SEND_FLAGS);
3786 int errsv = get_socket_errno ();
3791 if (socket->priv->blocking &&
3792 (errsv == EWOULDBLOCK ||
3796 g_set_error (error, G_IO_ERROR,
3797 socket_io_error_from_errno (errsv),
3798 _("Error sending message: %s"), socket_strerror (errsv));
3809 struct sockaddr_storage addr;
3816 /* Win32 doesn't support control messages.
3817 Actually this is possible for raw and datagram sockets
3818 via WSASendMessage on Vista or later, but that doesn't
3820 if (num_messages != 0)
3822 g_set_error_literal (error, G_IO_ERROR, G_IO_ERROR_NOT_SUPPORTED,
3823 _("GSocketControlMessage not supported on windows"));
3828 bufs = g_newa (WSABUF, num_vectors);
3829 for (i = 0; i < num_vectors; i++)
3831 bufs[i].buf = (char *)vectors[i].buffer;
3832 bufs[i].len = (gulong)vectors[i].size;
3836 addrlen = 0; /* Avoid warning */
3839 addrlen = g_socket_address_get_native_size (address);
3840 if (!g_socket_address_to_native (address, &addr, sizeof addr, error))
3846 if (socket->priv->blocking &&
3847 !g_socket_condition_wait (socket,
3848 G_IO_OUT, cancellable, error))
3852 result = WSASendTo (socket->priv->fd,
3855 (const struct sockaddr *)&addr, addrlen,
3858 result = WSASend (socket->priv->fd,
3865 int errsv = get_socket_errno ();
3867 if (errsv == WSAEINTR)
3870 if (errsv == WSAEWOULDBLOCK)
3871 win32_unset_event_mask (socket, FD_WRITE);
3873 if (socket->priv->blocking &&
3874 errsv == WSAEWOULDBLOCK)
3877 g_set_error (error, G_IO_ERROR,
3878 socket_io_error_from_errno (errsv),
3879 _("Error sending message: %s"), socket_strerror (errsv));
3892 * g_socket_receive_message:
3893 * @socket: a #GSocket
3894 * @address: (out) (allow-none): a pointer to a #GSocketAddress
3896 * @vectors: (array length=num_vectors): an array of #GInputVector structs
3897 * @num_vectors: the number of elements in @vectors, or -1
3898 * @messages: (array length=num_messages) (allow-none): a pointer which
3899 * may be filled with an array of #GSocketControlMessages, or %NULL
3900 * @num_messages: a pointer which will be filled with the number of
3901 * elements in @messages, or %NULL
3902 * @flags: a pointer to an int containing #GSocketMsgFlags flags
3903 * @cancellable: (allow-none): a %GCancellable or %NULL
3904 * @error: a #GError pointer, or %NULL
3906 * Receive data from a socket. This is the most complicated and
3907 * fully-featured version of this call. For easier use, see
3908 * g_socket_receive() and g_socket_receive_from().
3910 * If @address is non-%NULL then @address will be set equal to the
3911 * source address of the received packet.
3912 * @address is owned by the caller.
3914 * @vector must point to an array of #GInputVector structs and
3915 * @num_vectors must be the length of this array. These structs
3916 * describe the buffers that received data will be scattered into.
3917 * If @num_vectors is -1, then @vectors is assumed to be terminated
3918 * by a #GInputVector with a %NULL buffer pointer.
3920 * As a special case, if @num_vectors is 0 (in which case, @vectors
3921 * may of course be %NULL), then a single byte is received and
3922 * discarded. This is to facilitate the common practice of sending a
3923 * single '\0' byte for the purposes of transferring ancillary data.
3925 * @messages, if non-%NULL, will be set to point to a newly-allocated
3926 * array of #GSocketControlMessage instances or %NULL if no such
3927 * messages was received. These correspond to the control messages
3928 * received from the kernel, one #GSocketControlMessage per message
3929 * from the kernel. This array is %NULL-terminated and must be freed
3930 * by the caller using g_free() after calling g_object_unref() on each
3931 * element. If @messages is %NULL, any control messages received will
3934 * @num_messages, if non-%NULL, will be set to the number of control
3935 * messages received.
3937 * If both @messages and @num_messages are non-%NULL, then
3938 * @num_messages gives the number of #GSocketControlMessage instances
3939 * in @messages (ie: not including the %NULL terminator).
3941 * @flags is an in/out parameter. The commonly available arguments
3942 * for this are available in the #GSocketMsgFlags enum, but the
3943 * values there are the same as the system values, and the flags
3944 * are passed in as-is, so you can pass in system-specific flags too
3945 * (and g_socket_receive_message() may pass system-specific flags out).
3947 * As with g_socket_receive(), data may be discarded if @socket is
3948 * %G_SOCKET_TYPE_DATAGRAM or %G_SOCKET_TYPE_SEQPACKET and you do not
3949 * provide enough buffer space to read a complete message. You can pass
3950 * %G_SOCKET_MSG_PEEK in @flags to peek at the current message without
3951 * removing it from the receive queue, but there is no portable way to find
3952 * out the length of the message other than by reading it into a
3953 * sufficiently-large buffer.
3955 * If the socket is in blocking mode the call will block until there
3956 * is some data to receive, the connection is closed, or there is an
3957 * error. If there is no data available and the socket is in
3958 * non-blocking mode, a %G_IO_ERROR_WOULD_BLOCK error will be
3959 * returned. To be notified when data is available, wait for the
3960 * %G_IO_IN condition.
3962 * On error -1 is returned and @error is set accordingly.
3964 * Returns: Number of bytes read, or 0 if the connection was closed by
3965 * the peer, or -1 on error
3970 g_socket_receive_message (GSocket *socket,
3971 GSocketAddress **address,
3972 GInputVector *vectors,
3974 GSocketControlMessage ***messages,
3977 GCancellable *cancellable,
3980 GInputVector one_vector;
3983 g_return_val_if_fail (G_IS_SOCKET (socket), -1);
3985 if (!check_socket (socket, error))
3988 if (g_cancellable_set_error_if_cancelled (cancellable, error))
3991 if (num_vectors == -1)
3993 for (num_vectors = 0;
3994 vectors[num_vectors].buffer != NULL;
3999 if (num_vectors == 0)
4001 one_vector.buffer = &one_byte;
4002 one_vector.size = 1;
4004 vectors = &one_vector;
4011 struct sockaddr_storage one_sockaddr;
4016 msg.msg_name = &one_sockaddr;
4017 msg.msg_namelen = sizeof (struct sockaddr_storage);
4021 msg.msg_name = NULL;
4022 msg.msg_namelen = 0;
4026 /* this entire expression will be evaluated at compile time */
4027 if (sizeof *msg.msg_iov == sizeof *vectors &&
4028 sizeof msg.msg_iov->iov_base == sizeof vectors->buffer &&
4029 G_STRUCT_OFFSET (struct iovec, iov_base) ==
4030 G_STRUCT_OFFSET (GInputVector, buffer) &&
4031 sizeof msg.msg_iov->iov_len == sizeof vectors->size &&
4032 G_STRUCT_OFFSET (struct iovec, iov_len) ==
4033 G_STRUCT_OFFSET (GInputVector, size))
4034 /* ABI is compatible */
4036 msg.msg_iov = (struct iovec *) vectors;
4037 msg.msg_iovlen = num_vectors;
4040 /* ABI is incompatible */
4044 msg.msg_iov = g_newa (struct iovec, num_vectors);
4045 for (i = 0; i < num_vectors; i++)
4047 msg.msg_iov[i].iov_base = vectors[i].buffer;
4048 msg.msg_iov[i].iov_len = vectors[i].size;
4050 msg.msg_iovlen = num_vectors;
4054 msg.msg_control = g_alloca (2048);
4055 msg.msg_controllen = 2048;
4059 msg.msg_flags = *flags;
4063 /* We always set the close-on-exec flag so we don't leak file
4064 * descriptors into child processes. Note that gunixfdmessage.c
4065 * will later call fcntl (fd, FD_CLOEXEC), but that isn't atomic.
4067 #ifdef MSG_CMSG_CLOEXEC
4068 msg.msg_flags |= MSG_CMSG_CLOEXEC;
4074 if (socket->priv->blocking &&
4075 !g_socket_condition_wait (socket,
4076 G_IO_IN, cancellable, error))
4079 result = recvmsg (socket->priv->fd, &msg, msg.msg_flags);
4080 #ifdef MSG_CMSG_CLOEXEC
4081 if (result < 0 && get_socket_errno () == EINVAL)
4083 /* We must be running on an old kernel. Call without the flag. */
4084 msg.msg_flags &= ~(MSG_CMSG_CLOEXEC);
4085 result = recvmsg (socket->priv->fd, &msg, msg.msg_flags);
4091 int errsv = get_socket_errno ();
4096 if (socket->priv->blocking &&
4097 (errsv == EWOULDBLOCK ||
4101 g_set_error (error, G_IO_ERROR,
4102 socket_io_error_from_errno (errsv),
4103 _("Error receiving message: %s"), socket_strerror (errsv));
4110 /* decode address */
4111 if (address != NULL)
4113 if (msg.msg_namelen > 0)
4114 *address = g_socket_address_new_from_native (msg.msg_name,
4120 /* decode control messages */
4122 GPtrArray *my_messages = NULL;
4123 struct cmsghdr *cmsg;
4125 for (cmsg = CMSG_FIRSTHDR (&msg); cmsg; cmsg = CMSG_NXTHDR (&msg, cmsg))
4127 GSocketControlMessage *message;
4129 message = g_socket_control_message_deserialize (cmsg->cmsg_level,
4131 cmsg->cmsg_len - ((char *)CMSG_DATA (cmsg) - (char *)cmsg),
4133 if (message == NULL)
4134 /* We've already spewed about the problem in the
4135 deserialization code, so just continue */
4138 if (messages == NULL)
4140 /* we have to do it this way if the user ignores the
4141 * messages so that we will close any received fds.
4143 g_object_unref (message);
4147 if (my_messages == NULL)
4148 my_messages = g_ptr_array_new ();
4149 g_ptr_array_add (my_messages, message);
4154 *num_messages = my_messages != NULL ? my_messages->len : 0;
4158 if (my_messages == NULL)
4164 g_ptr_array_add (my_messages, NULL);
4165 *messages = (GSocketControlMessage **) g_ptr_array_free (my_messages, FALSE);
4170 g_assert (my_messages == NULL);
4174 /* capture the flags */
4176 *flags = msg.msg_flags;
4182 struct sockaddr_storage addr;
4184 DWORD bytes_received;
4191 bufs = g_newa (WSABUF, num_vectors);
4192 for (i = 0; i < num_vectors; i++)
4194 bufs[i].buf = (char *)vectors[i].buffer;
4195 bufs[i].len = (gulong)vectors[i].size;
4207 if (socket->priv->blocking &&
4208 !g_socket_condition_wait (socket,
4209 G_IO_IN, cancellable, error))
4212 addrlen = sizeof addr;
4214 result = WSARecvFrom (socket->priv->fd,
4216 &bytes_received, &win_flags,
4217 (struct sockaddr *)&addr, &addrlen,
4220 result = WSARecv (socket->priv->fd,
4222 &bytes_received, &win_flags,
4226 int errsv = get_socket_errno ();
4228 if (errsv == WSAEINTR)
4231 win32_unset_event_mask (socket, FD_READ);
4233 if (socket->priv->blocking &&
4234 errsv == WSAEWOULDBLOCK)
4237 g_set_error (error, G_IO_ERROR,
4238 socket_io_error_from_errno (errsv),
4239 _("Error receiving message: %s"), socket_strerror (errsv));
4243 win32_unset_event_mask (socket, FD_READ);
4247 /* decode address */
4248 if (address != NULL)
4251 *address = g_socket_address_new_from_native (&addr, addrlen);
4256 /* capture the flags */
4260 if (messages != NULL)
4262 if (num_messages != NULL)
4265 return bytes_received;
4271 * g_socket_get_credentials:
4272 * @socket: a #GSocket.
4273 * @error: #GError for error reporting, or %NULL to ignore.
4275 * Returns the credentials of the foreign process connected to this
4276 * socket, if any (e.g. it is only supported for %G_SOCKET_FAMILY_UNIX
4279 * If this operation isn't supported on the OS, the method fails with
4280 * the %G_IO_ERROR_NOT_SUPPORTED error. On Linux this is implemented
4281 * by reading the %SO_PEERCRED option on the underlying socket.
4283 * Other ways to obtain credentials from a foreign peer includes the
4284 * #GUnixCredentialsMessage type and
4285 * g_unix_connection_send_credentials() /
4286 * g_unix_connection_receive_credentials() functions.
4288 * Returns: (transfer full): %NULL if @error is set, otherwise a #GCredentials object
4289 * that must be freed with g_object_unref().
4294 g_socket_get_credentials (GSocket *socket,
4299 g_return_val_if_fail (G_IS_SOCKET (socket), NULL);
4300 g_return_val_if_fail (error == NULL || *error == NULL, NULL);
4304 #if defined(__linux__) || defined(__OpenBSD__)
4307 #if defined(__linux__)
4308 struct ucred native_creds;
4309 optlen = sizeof (struct ucred);
4310 #elif defined(__OpenBSD__)
4311 struct sockpeercred native_creds;
4312 optlen = sizeof (struct sockpeercred);
4314 if (getsockopt (socket->priv->fd,
4317 (void *)&native_creds,
4320 int errsv = get_socket_errno ();
4323 socket_io_error_from_errno (errsv),
4324 _("Unable to get pending error: %s"),
4325 socket_strerror (errsv));
4329 ret = g_credentials_new ();
4330 g_credentials_set_native (ret,
4331 #if defined(__linux__)
4332 G_CREDENTIALS_TYPE_LINUX_UCRED,
4333 #elif defined(__OpenBSD__)
4334 G_CREDENTIALS_TYPE_OPENBSD_SOCKPEERCRED,
4340 g_set_error_literal (error,
4342 G_IO_ERROR_NOT_SUPPORTED,
4343 _("g_socket_get_credentials not implemented for this OS"));