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"
50 #include "gcancellable.h"
51 #include "gioenumtypes.h"
52 #include "ginetaddress.h"
53 #include "ginitable.h"
57 #include "gnetworkingprivate.h"
58 #include "gsocketaddress.h"
59 #include "gsocketcontrolmessage.h"
60 #include "gcredentials.h"
65 * @short_description: Low-level socket object
67 * @see_also: #GInitable
69 * A #GSocket is a low-level networking primitive. It is a more or less
70 * direct mapping of the BSD socket API in a portable GObject based API.
71 * It supports both the UNIX socket implementations and winsock2 on Windows.
73 * #GSocket is the platform independent base upon which the higher level
74 * network primitives are based. Applications are not typically meant to
75 * use it directly, but rather through classes like #GSocketClient,
76 * #GSocketService and #GSocketConnection. However there may be cases where
77 * direct use of #GSocket is useful.
79 * #GSocket implements the #GInitable interface, so if it is manually constructed
80 * by e.g. g_object_new() you must call g_initable_init() and check the
81 * results before using the object. This is done automatically in
82 * g_socket_new() and g_socket_new_from_fd(), so these functions can return
85 * Sockets operate in two general modes, blocking or non-blocking. When
86 * in blocking mode all operations block until the requested operation
87 * is finished or there is an error. In non-blocking mode all calls that
88 * would block return immediately with a %G_IO_ERROR_WOULD_BLOCK error.
89 * To know when a call would successfully run you can call g_socket_condition_check(),
90 * or g_socket_condition_wait(). You can also use g_socket_create_source() and
91 * attach it to a #GMainContext to get callbacks when I/O is possible.
92 * Note that all sockets are always set to non blocking mode in the system, and
93 * blocking mode is emulated in GSocket.
95 * When working in non-blocking mode applications should always be able to
96 * handle getting a %G_IO_ERROR_WOULD_BLOCK error even when some other
97 * function said that I/O was possible. This can easily happen in case
98 * of a race condition in the application, but it can also happen for other
99 * reasons. For instance, on Windows a socket is always seen as writable
100 * until a write returns %G_IO_ERROR_WOULD_BLOCK.
102 * #GSocket<!-- -->s can be either connection oriented or datagram based.
103 * For connection oriented types you must first establish a connection by
104 * either connecting to an address or accepting a connection from another
105 * address. For connectionless socket types the target/source address is
106 * specified or received in each I/O operation.
108 * All socket file descriptors are set to be close-on-exec.
110 * Note that creating a #GSocket causes the signal %SIGPIPE to be
111 * ignored for the remainder of the program. If you are writing a
112 * command-line utility that uses #GSocket, you may need to take into
113 * account the fact that your program will not automatically be killed
114 * if it tries to write to %stdout after it has been closed.
119 static void g_socket_initable_iface_init (GInitableIface *iface);
120 static gboolean g_socket_initable_init (GInitable *initable,
121 GCancellable *cancellable,
124 G_DEFINE_TYPE_WITH_CODE (GSocket, g_socket, G_TYPE_OBJECT,
125 G_IMPLEMENT_INTERFACE (G_TYPE_INITABLE,
126 g_socket_initable_iface_init));
143 struct _GSocketPrivate
145 GSocketFamily family;
147 GSocketProtocol protocol;
151 GError *construct_error;
152 GSocketAddress *remote_address;
160 guint connect_pending : 1;
166 GList *requested_conditions; /* list of requested GIOCondition * */
171 get_socket_errno (void)
176 return WSAGetLastError ();
181 socket_io_error_from_errno (int err)
184 return g_io_error_from_errno (err);
189 return G_IO_ERROR_ADDRESS_IN_USE;
191 return G_IO_ERROR_WOULD_BLOCK;
193 return G_IO_ERROR_PERMISSION_DENIED;
194 case WSA_INVALID_HANDLE:
195 case WSA_INVALID_PARAMETER:
198 return G_IO_ERROR_INVALID_ARGUMENT;
199 case WSAEPROTONOSUPPORT:
200 return G_IO_ERROR_NOT_SUPPORTED;
202 return G_IO_ERROR_CANCELLED;
203 case WSAESOCKTNOSUPPORT:
205 case WSAEPFNOSUPPORT:
206 case WSAEAFNOSUPPORT:
207 return G_IO_ERROR_NOT_SUPPORTED;
209 return G_IO_ERROR_FAILED;
215 socket_strerror (int err)
218 return g_strerror (err);
223 msg = g_win32_error_message (err);
225 msg_ret = g_intern_string (msg);
233 #define win32_unset_event_mask(_socket, _mask) _win32_unset_event_mask (_socket, _mask)
235 _win32_unset_event_mask (GSocket *socket, int mask)
237 socket->priv->current_events &= ~mask;
238 socket->priv->current_errors &= ~mask;
241 #define win32_unset_event_mask(_socket, _mask)
245 set_fd_nonblocking (int fd)
248 GError *error = NULL;
254 if (!g_unix_set_fd_nonblocking (fd, TRUE, &error))
256 g_warning ("Error setting socket nonblocking: %s", error->message);
257 g_clear_error (&error);
262 if (ioctlsocket (fd, FIONBIO, &arg) == SOCKET_ERROR)
264 int errsv = get_socket_errno ();
265 g_warning ("Error setting socket status flags: %s", socket_strerror (errsv));
271 check_socket (GSocket *socket,
274 if (!socket->priv->inited)
276 g_set_error_literal (error, G_IO_ERROR, G_IO_ERROR_NOT_INITIALIZED,
277 _("Invalid socket, not initialized"));
281 if (socket->priv->construct_error)
283 g_set_error (error, G_IO_ERROR, G_IO_ERROR_NOT_INITIALIZED,
284 _("Invalid socket, initialization failed due to: %s"),
285 socket->priv->construct_error->message);
289 if (socket->priv->closed)
291 g_set_error_literal (error, G_IO_ERROR, G_IO_ERROR_CLOSED,
292 _("Socket is already closed"));
296 if (socket->priv->timed_out)
298 socket->priv->timed_out = FALSE;
299 g_set_error_literal (error, G_IO_ERROR, G_IO_ERROR_TIMED_OUT,
300 _("Socket I/O timed out"));
308 g_socket_details_from_fd (GSocket *socket)
310 struct sockaddr_storage address;
317 /* See bug #611756 */
318 BOOL bool_val = FALSE;
323 fd = socket->priv->fd;
324 optlen = sizeof value;
325 if (getsockopt (fd, SOL_SOCKET, SO_TYPE, (void *)&value, &optlen) != 0)
327 errsv = get_socket_errno ();
338 /* programmer error */
339 g_error ("creating GSocket from fd %d: %s\n",
340 fd, socket_strerror (errsv));
348 g_assert (optlen == sizeof value);
352 socket->priv->type = G_SOCKET_TYPE_STREAM;
356 socket->priv->type = G_SOCKET_TYPE_DATAGRAM;
360 socket->priv->type = G_SOCKET_TYPE_SEQPACKET;
364 socket->priv->type = G_SOCKET_TYPE_INVALID;
368 addrlen = sizeof address;
369 if (getsockname (fd, (struct sockaddr *) &address, &addrlen) != 0)
371 errsv = get_socket_errno ();
377 g_assert (G_STRUCT_OFFSET (struct sockaddr, sa_family) +
378 sizeof address.ss_family <= addrlen);
379 family = address.ss_family;
383 /* On Solaris, this happens if the socket is not yet connected.
384 * But we can use SO_DOMAIN as a workaround there.
387 optlen = sizeof family;
388 if (getsockopt (fd, SOL_SOCKET, SO_DOMAIN, (void *)&family, &optlen) != 0)
390 errsv = get_socket_errno ();
394 /* This will translate to G_IO_ERROR_FAILED on either unix or windows */
402 case G_SOCKET_FAMILY_IPV4:
403 case G_SOCKET_FAMILY_IPV6:
404 socket->priv->family = address.ss_family;
405 switch (socket->priv->type)
407 case G_SOCKET_TYPE_STREAM:
408 socket->priv->protocol = G_SOCKET_PROTOCOL_TCP;
411 case G_SOCKET_TYPE_DATAGRAM:
412 socket->priv->protocol = G_SOCKET_PROTOCOL_UDP;
415 case G_SOCKET_TYPE_SEQPACKET:
416 socket->priv->protocol = G_SOCKET_PROTOCOL_SCTP;
424 case G_SOCKET_FAMILY_UNIX:
425 socket->priv->family = G_SOCKET_FAMILY_UNIX;
426 socket->priv->protocol = G_SOCKET_PROTOCOL_DEFAULT;
430 socket->priv->family = G_SOCKET_FAMILY_INVALID;
434 if (socket->priv->family != G_SOCKET_FAMILY_INVALID)
436 addrlen = sizeof address;
437 if (getpeername (fd, (struct sockaddr *) &address, &addrlen) >= 0)
438 socket->priv->connected = TRUE;
441 optlen = sizeof bool_val;
442 if (getsockopt (fd, SOL_SOCKET, SO_KEEPALIVE,
443 (void *)&bool_val, &optlen) == 0)
446 /* Experimentation indicates that the SO_KEEPALIVE value is
447 * actually a char on Windows, even if documentation claims it
448 * to be a BOOL which is a typedef for int. So this g_assert()
449 * fails. See bug #611756.
451 g_assert (optlen == sizeof bool_val);
453 socket->priv->keepalive = !!bool_val;
457 /* Can't read, maybe not supported, assume FALSE */
458 socket->priv->keepalive = FALSE;
464 g_set_error (&socket->priv->construct_error, G_IO_ERROR,
465 socket_io_error_from_errno (errsv),
466 _("creating GSocket from fd: %s"),
467 socket_strerror (errsv));
471 g_socket_create_socket (GSocketFamily family,
481 case G_SOCKET_TYPE_STREAM:
482 native_type = SOCK_STREAM;
485 case G_SOCKET_TYPE_DATAGRAM:
486 native_type = SOCK_DGRAM;
489 case G_SOCKET_TYPE_SEQPACKET:
490 native_type = SOCK_SEQPACKET;
494 g_assert_not_reached ();
499 g_set_error (error, G_IO_ERROR, G_IO_ERROR_INVALID_ARGUMENT,
500 _("Unable to create socket: %s"), _("Unknown protocol was specified"));
505 fd = socket (family, native_type | SOCK_CLOEXEC, protocol);
506 /* It's possible that libc has SOCK_CLOEXEC but the kernel does not */
507 if (fd < 0 && errno == EINVAL)
509 fd = socket (family, native_type, protocol);
513 int errsv = get_socket_errno ();
515 g_set_error (error, G_IO_ERROR, socket_io_error_from_errno (errsv),
516 _("Unable to create socket: %s"), socket_strerror (errsv));
523 /* We always want to set close-on-exec to protect users. If you
524 need to so some weird inheritance to exec you can re-enable this
525 using lower level hacks with g_socket_get_fd(). */
526 flags = fcntl (fd, F_GETFD, 0);
528 (flags & FD_CLOEXEC) == 0)
531 fcntl (fd, F_SETFD, flags);
540 g_socket_constructed (GObject *object)
542 GSocket *socket = G_SOCKET (object);
544 if (socket->priv->fd >= 0)
545 /* create socket->priv info from the fd */
546 g_socket_details_from_fd (socket);
549 /* create the fd from socket->priv info */
550 socket->priv->fd = g_socket_create_socket (socket->priv->family,
552 socket->priv->protocol,
553 &socket->priv->construct_error);
555 /* Always use native nonblocking sockets, as
556 windows sets sockets to nonblocking automatically
557 in certain operations. This way we make things work
558 the same on all platforms */
559 if (socket->priv->fd != -1)
560 set_fd_nonblocking (socket->priv->fd);
564 g_socket_get_property (GObject *object,
569 GSocket *socket = G_SOCKET (object);
570 GSocketAddress *address;
575 g_value_set_enum (value, socket->priv->family);
579 g_value_set_enum (value, socket->priv->type);
583 g_value_set_enum (value, socket->priv->protocol);
587 g_value_set_int (value, socket->priv->fd);
591 g_value_set_boolean (value, socket->priv->blocking);
594 case PROP_LISTEN_BACKLOG:
595 g_value_set_int (value, socket->priv->listen_backlog);
599 g_value_set_boolean (value, socket->priv->keepalive);
602 case PROP_LOCAL_ADDRESS:
603 address = g_socket_get_local_address (socket, NULL);
604 g_value_take_object (value, address);
607 case PROP_REMOTE_ADDRESS:
608 address = g_socket_get_remote_address (socket, NULL);
609 g_value_take_object (value, address);
613 g_value_set_uint (value, socket->priv->timeout);
617 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
622 g_socket_set_property (GObject *object,
627 GSocket *socket = G_SOCKET (object);
632 socket->priv->family = g_value_get_enum (value);
636 socket->priv->type = g_value_get_enum (value);
640 socket->priv->protocol = g_value_get_enum (value);
644 socket->priv->fd = g_value_get_int (value);
648 g_socket_set_blocking (socket, g_value_get_boolean (value));
651 case PROP_LISTEN_BACKLOG:
652 g_socket_set_listen_backlog (socket, g_value_get_int (value));
656 g_socket_set_keepalive (socket, g_value_get_boolean (value));
660 g_socket_set_timeout (socket, g_value_get_uint (value));
664 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
669 g_socket_finalize (GObject *object)
671 GSocket *socket = G_SOCKET (object);
673 g_clear_error (&socket->priv->construct_error);
675 if (socket->priv->fd != -1 &&
676 !socket->priv->closed)
677 g_socket_close (socket, NULL);
679 if (socket->priv->remote_address)
680 g_object_unref (socket->priv->remote_address);
683 if (socket->priv->event != WSA_INVALID_EVENT)
685 WSACloseEvent (socket->priv->event);
686 socket->priv->event = WSA_INVALID_EVENT;
689 g_assert (socket->priv->requested_conditions == NULL);
692 if (G_OBJECT_CLASS (g_socket_parent_class)->finalize)
693 (*G_OBJECT_CLASS (g_socket_parent_class)->finalize) (object);
697 g_socket_class_init (GSocketClass *klass)
699 GObjectClass *gobject_class G_GNUC_UNUSED = G_OBJECT_CLASS (klass);
702 /* Make sure winsock has been initialized */
703 type = g_inet_address_get_type ();
704 (type); /* To avoid -Wunused-but-set-variable */
707 /* There is no portable, thread-safe way to avoid having the process
708 * be killed by SIGPIPE when calling send() or sendmsg(), so we are
709 * forced to simply ignore the signal process-wide.
711 signal (SIGPIPE, SIG_IGN);
714 g_type_class_add_private (klass, sizeof (GSocketPrivate));
716 gobject_class->finalize = g_socket_finalize;
717 gobject_class->constructed = g_socket_constructed;
718 gobject_class->set_property = g_socket_set_property;
719 gobject_class->get_property = g_socket_get_property;
721 g_object_class_install_property (gobject_class, PROP_FAMILY,
722 g_param_spec_enum ("family",
724 P_("The sockets address family"),
725 G_TYPE_SOCKET_FAMILY,
726 G_SOCKET_FAMILY_INVALID,
727 G_PARAM_CONSTRUCT_ONLY |
729 G_PARAM_STATIC_STRINGS));
731 g_object_class_install_property (gobject_class, PROP_TYPE,
732 g_param_spec_enum ("type",
734 P_("The sockets type"),
736 G_SOCKET_TYPE_STREAM,
737 G_PARAM_CONSTRUCT_ONLY |
739 G_PARAM_STATIC_STRINGS));
741 g_object_class_install_property (gobject_class, PROP_PROTOCOL,
742 g_param_spec_enum ("protocol",
743 P_("Socket protocol"),
744 P_("The id of the protocol to use, or -1 for unknown"),
745 G_TYPE_SOCKET_PROTOCOL,
746 G_SOCKET_PROTOCOL_UNKNOWN,
747 G_PARAM_CONSTRUCT_ONLY |
749 G_PARAM_STATIC_STRINGS));
751 g_object_class_install_property (gobject_class, PROP_FD,
752 g_param_spec_int ("fd",
753 P_("File descriptor"),
754 P_("The sockets file descriptor"),
758 G_PARAM_CONSTRUCT_ONLY |
760 G_PARAM_STATIC_STRINGS));
762 g_object_class_install_property (gobject_class, PROP_BLOCKING,
763 g_param_spec_boolean ("blocking",
765 P_("Whether or not I/O on this socket is blocking"),
768 G_PARAM_STATIC_STRINGS));
770 g_object_class_install_property (gobject_class, PROP_LISTEN_BACKLOG,
771 g_param_spec_int ("listen-backlog",
772 P_("Listen backlog"),
773 P_("Outstanding connections in the listen queue"),
778 G_PARAM_STATIC_STRINGS));
780 g_object_class_install_property (gobject_class, PROP_KEEPALIVE,
781 g_param_spec_boolean ("keepalive",
782 P_("Keep connection alive"),
783 P_("Keep connection alive by sending periodic pings"),
786 G_PARAM_STATIC_STRINGS));
788 g_object_class_install_property (gobject_class, PROP_LOCAL_ADDRESS,
789 g_param_spec_object ("local-address",
791 P_("The local address the socket is bound to"),
792 G_TYPE_SOCKET_ADDRESS,
794 G_PARAM_STATIC_STRINGS));
796 g_object_class_install_property (gobject_class, PROP_REMOTE_ADDRESS,
797 g_param_spec_object ("remote-address",
798 P_("Remote address"),
799 P_("The remote address the socket is connected to"),
800 G_TYPE_SOCKET_ADDRESS,
802 G_PARAM_STATIC_STRINGS));
807 * The timeout in seconds on socket I/O
811 g_object_class_install_property (gobject_class, PROP_TIMEOUT,
812 g_param_spec_uint ("timeout",
814 P_("The timeout in seconds on socket I/O"),
819 G_PARAM_STATIC_STRINGS));
823 g_socket_initable_iface_init (GInitableIface *iface)
825 iface->init = g_socket_initable_init;
829 g_socket_init (GSocket *socket)
831 socket->priv = G_TYPE_INSTANCE_GET_PRIVATE (socket, G_TYPE_SOCKET, GSocketPrivate);
833 socket->priv->fd = -1;
834 socket->priv->blocking = TRUE;
835 socket->priv->listen_backlog = 10;
836 socket->priv->construct_error = NULL;
838 socket->priv->event = WSA_INVALID_EVENT;
843 g_socket_initable_init (GInitable *initable,
844 GCancellable *cancellable,
849 g_return_val_if_fail (G_IS_SOCKET (initable), FALSE);
851 socket = G_SOCKET (initable);
853 if (cancellable != NULL)
855 g_set_error_literal (error, G_IO_ERROR, G_IO_ERROR_NOT_SUPPORTED,
856 _("Cancellable initialization not supported"));
860 socket->priv->inited = TRUE;
862 if (socket->priv->construct_error)
865 *error = g_error_copy (socket->priv->construct_error);
875 * @family: the socket family to use, e.g. %G_SOCKET_FAMILY_IPV4.
876 * @type: the socket type to use.
877 * @protocol: the id of the protocol to use, or 0 for default.
878 * @error: #GError for error reporting, or %NULL to ignore.
880 * Creates a new #GSocket with the defined family, type and protocol.
881 * If @protocol is 0 (%G_SOCKET_PROTOCOL_DEFAULT) the default protocol type
882 * for the family and type is used.
884 * The @protocol is a family and type specific int that specifies what
885 * kind of protocol to use. #GSocketProtocol lists several common ones.
886 * Many families only support one protocol, and use 0 for this, others
887 * support several and using 0 means to use the default protocol for
888 * the family and type.
890 * The protocol id is passed directly to the operating
891 * system, so you can use protocols not listed in #GSocketProtocol if you
892 * know the protocol number used for it.
894 * Returns: a #GSocket or %NULL on error.
895 * Free the returned object with g_object_unref().
900 g_socket_new (GSocketFamily family,
902 GSocketProtocol protocol,
905 return G_SOCKET (g_initable_new (G_TYPE_SOCKET,
909 "protocol", protocol,
914 * g_socket_new_from_fd:
915 * @fd: a native socket file descriptor.
916 * @error: #GError for error reporting, or %NULL to ignore.
918 * Creates a new #GSocket from a native file descriptor
919 * or winsock SOCKET handle.
921 * This reads all the settings from the file descriptor so that
922 * all properties should work. Note that the file descriptor
923 * will be set to non-blocking mode, independent on the blocking
924 * mode of the #GSocket.
926 * Returns: a #GSocket or %NULL on error.
927 * Free the returned object with g_object_unref().
932 g_socket_new_from_fd (gint fd,
935 return G_SOCKET (g_initable_new (G_TYPE_SOCKET,
942 * g_socket_set_blocking:
943 * @socket: a #GSocket.
944 * @blocking: Whether to use blocking I/O or not.
946 * Sets the blocking mode of the socket. In blocking mode
947 * all operations block until they succeed or there is an error. In
948 * non-blocking mode all functions return results immediately or
949 * with a %G_IO_ERROR_WOULD_BLOCK error.
951 * All sockets are created in blocking mode. However, note that the
952 * platform level socket is always non-blocking, and blocking mode
953 * is a GSocket level feature.
958 g_socket_set_blocking (GSocket *socket,
961 g_return_if_fail (G_IS_SOCKET (socket));
963 blocking = !!blocking;
965 if (socket->priv->blocking == blocking)
968 socket->priv->blocking = blocking;
969 g_object_notify (G_OBJECT (socket), "blocking");
973 * g_socket_get_blocking:
974 * @socket: a #GSocket.
976 * Gets the blocking mode of the socket. For details on blocking I/O,
977 * see g_socket_set_blocking().
979 * Returns: %TRUE if blocking I/O is used, %FALSE otherwise.
984 g_socket_get_blocking (GSocket *socket)
986 g_return_val_if_fail (G_IS_SOCKET (socket), FALSE);
988 return socket->priv->blocking;
992 * g_socket_set_keepalive:
993 * @socket: a #GSocket.
994 * @keepalive: Value for the keepalive flag
996 * Sets or unsets the %SO_KEEPALIVE flag on the underlying socket. When
997 * this flag is set on a socket, the system will attempt to verify that the
998 * remote socket endpoint is still present if a sufficiently long period of
999 * time passes with no data being exchanged. If the system is unable to
1000 * verify the presence of the remote endpoint, it will automatically close
1003 * This option is only functional on certain kinds of sockets. (Notably,
1004 * %G_SOCKET_PROTOCOL_TCP sockets.)
1006 * The exact time between pings is system- and protocol-dependent, but will
1007 * normally be at least two hours. Most commonly, you would set this flag
1008 * on a server socket if you want to allow clients to remain idle for long
1009 * periods of time, but also want to ensure that connections are eventually
1010 * garbage-collected if clients crash or become unreachable.
1015 g_socket_set_keepalive (GSocket *socket,
1020 g_return_if_fail (G_IS_SOCKET (socket));
1022 keepalive = !!keepalive;
1023 if (socket->priv->keepalive == keepalive)
1026 value = (gint) keepalive;
1027 if (setsockopt (socket->priv->fd, SOL_SOCKET, SO_KEEPALIVE,
1028 (gpointer) &value, sizeof (value)) < 0)
1030 int errsv = get_socket_errno ();
1031 g_warning ("error setting keepalive: %s", socket_strerror (errsv));
1035 socket->priv->keepalive = keepalive;
1036 g_object_notify (G_OBJECT (socket), "keepalive");
1040 * g_socket_get_keepalive:
1041 * @socket: a #GSocket.
1043 * Gets the keepalive mode of the socket. For details on this,
1044 * see g_socket_set_keepalive().
1046 * Returns: %TRUE if keepalive is active, %FALSE otherwise.
1051 g_socket_get_keepalive (GSocket *socket)
1053 g_return_val_if_fail (G_IS_SOCKET (socket), FALSE);
1055 return socket->priv->keepalive;
1059 * g_socket_get_listen_backlog:
1060 * @socket: a #GSocket.
1062 * Gets the listen backlog setting of the socket. For details on this,
1063 * see g_socket_set_listen_backlog().
1065 * Returns: the maximum number of pending connections.
1070 g_socket_get_listen_backlog (GSocket *socket)
1072 g_return_val_if_fail (G_IS_SOCKET (socket), 0);
1074 return socket->priv->listen_backlog;
1078 * g_socket_set_listen_backlog:
1079 * @socket: a #GSocket.
1080 * @backlog: the maximum number of pending connections.
1082 * Sets the maximum number of outstanding connections allowed
1083 * when listening on this socket. If more clients than this are
1084 * connecting to the socket and the application is not handling them
1085 * on time then the new connections will be refused.
1087 * Note that this must be called before g_socket_listen() and has no
1088 * effect if called after that.
1093 g_socket_set_listen_backlog (GSocket *socket,
1096 g_return_if_fail (G_IS_SOCKET (socket));
1097 g_return_if_fail (!socket->priv->listening);
1099 if (backlog != socket->priv->listen_backlog)
1101 socket->priv->listen_backlog = backlog;
1102 g_object_notify (G_OBJECT (socket), "listen-backlog");
1107 * g_socket_get_timeout:
1108 * @socket: a #GSocket.
1110 * Gets the timeout setting of the socket. For details on this, see
1111 * g_socket_set_timeout().
1113 * Returns: the timeout in seconds
1118 g_socket_get_timeout (GSocket *socket)
1120 g_return_val_if_fail (G_IS_SOCKET (socket), 0);
1122 return socket->priv->timeout;
1126 * g_socket_set_timeout:
1127 * @socket: a #GSocket.
1128 * @timeout: the timeout for @socket, in seconds, or 0 for none
1130 * Sets the time in seconds after which I/O operations on @socket will
1131 * time out if they have not yet completed.
1133 * On a blocking socket, this means that any blocking #GSocket
1134 * operation will time out after @timeout seconds of inactivity,
1135 * returning %G_IO_ERROR_TIMED_OUT.
1137 * On a non-blocking socket, calls to g_socket_condition_wait() will
1138 * also fail with %G_IO_ERROR_TIMED_OUT after the given time. Sources
1139 * created with g_socket_create_source() will trigger after
1140 * @timeout seconds of inactivity, with the requested condition
1141 * set, at which point calling g_socket_receive(), g_socket_send(),
1142 * g_socket_check_connect_result(), etc, will fail with
1143 * %G_IO_ERROR_TIMED_OUT.
1145 * If @timeout is 0 (the default), operations will never time out
1148 * Note that if an I/O operation is interrupted by a signal, this may
1149 * cause the timeout to be reset.
1154 g_socket_set_timeout (GSocket *socket,
1157 g_return_if_fail (G_IS_SOCKET (socket));
1159 if (timeout != socket->priv->timeout)
1161 socket->priv->timeout = timeout;
1162 g_object_notify (G_OBJECT (socket), "timeout");
1167 * g_socket_get_family:
1168 * @socket: a #GSocket.
1170 * Gets the socket family of the socket.
1172 * Returns: a #GSocketFamily
1177 g_socket_get_family (GSocket *socket)
1179 g_return_val_if_fail (G_IS_SOCKET (socket), G_SOCKET_FAMILY_INVALID);
1181 return socket->priv->family;
1185 * g_socket_get_socket_type:
1186 * @socket: a #GSocket.
1188 * Gets the socket type of the socket.
1190 * Returns: a #GSocketType
1195 g_socket_get_socket_type (GSocket *socket)
1197 g_return_val_if_fail (G_IS_SOCKET (socket), G_SOCKET_TYPE_INVALID);
1199 return socket->priv->type;
1203 * g_socket_get_protocol:
1204 * @socket: a #GSocket.
1206 * Gets the socket protocol id the socket was created with.
1207 * In case the protocol is unknown, -1 is returned.
1209 * Returns: a protocol id, or -1 if unknown
1214 g_socket_get_protocol (GSocket *socket)
1216 g_return_val_if_fail (G_IS_SOCKET (socket), -1);
1218 return socket->priv->protocol;
1223 * @socket: a #GSocket.
1225 * Returns the underlying OS socket object. On unix this
1226 * is a socket file descriptor, and on windows this is
1227 * a Winsock2 SOCKET handle. This may be useful for
1228 * doing platform specific or otherwise unusual operations
1231 * Returns: the file descriptor of the socket.
1236 g_socket_get_fd (GSocket *socket)
1238 g_return_val_if_fail (G_IS_SOCKET (socket), -1);
1240 return socket->priv->fd;
1244 * g_socket_get_local_address:
1245 * @socket: a #GSocket.
1246 * @error: #GError for error reporting, or %NULL to ignore.
1248 * Try to get the local address of a bound socket. This is only
1249 * useful if the socket has been bound to a local address,
1250 * either explicitly or implicitly when connecting.
1252 * Returns: (transfer full): a #GSocketAddress or %NULL on error.
1253 * Free the returned object with g_object_unref().
1258 g_socket_get_local_address (GSocket *socket,
1261 struct sockaddr_storage buffer;
1262 guint32 len = sizeof (buffer);
1264 g_return_val_if_fail (G_IS_SOCKET (socket), NULL);
1266 if (getsockname (socket->priv->fd, (struct sockaddr *) &buffer, &len) < 0)
1268 int errsv = get_socket_errno ();
1269 g_set_error (error, G_IO_ERROR, socket_io_error_from_errno (errsv),
1270 _("could not get local address: %s"), socket_strerror (errsv));
1274 return g_socket_address_new_from_native (&buffer, len);
1278 * g_socket_get_remote_address:
1279 * @socket: a #GSocket.
1280 * @error: #GError for error reporting, or %NULL to ignore.
1282 * Try to get the remove address of a connected socket. This is only
1283 * useful for connection oriented sockets that have been connected.
1285 * Returns: (transfer full): a #GSocketAddress or %NULL on error.
1286 * Free the returned object with g_object_unref().
1291 g_socket_get_remote_address (GSocket *socket,
1294 struct sockaddr_storage buffer;
1295 guint32 len = sizeof (buffer);
1297 g_return_val_if_fail (G_IS_SOCKET (socket), NULL);
1299 if (socket->priv->connect_pending)
1301 if (!g_socket_check_connect_result (socket, error))
1304 socket->priv->connect_pending = FALSE;
1307 if (!socket->priv->remote_address)
1309 if (getpeername (socket->priv->fd, (struct sockaddr *) &buffer, &len) < 0)
1311 int errsv = get_socket_errno ();
1312 g_set_error (error, G_IO_ERROR, socket_io_error_from_errno (errsv),
1313 _("could not get remote address: %s"), socket_strerror (errsv));
1317 socket->priv->remote_address = g_socket_address_new_from_native (&buffer, len);
1320 return g_object_ref (socket->priv->remote_address);
1324 * g_socket_is_connected:
1325 * @socket: a #GSocket.
1327 * Check whether the socket is connected. This is only useful for
1328 * connection-oriented sockets.
1330 * Returns: %TRUE if socket is connected, %FALSE otherwise.
1335 g_socket_is_connected (GSocket *socket)
1337 g_return_val_if_fail (G_IS_SOCKET (socket), FALSE);
1339 return socket->priv->connected;
1344 * @socket: a #GSocket.
1345 * @error: #GError for error reporting, or %NULL to ignore.
1347 * Marks the socket as a server socket, i.e. a socket that is used
1348 * to accept incoming requests using g_socket_accept().
1350 * Before calling this the socket must be bound to a local address using
1353 * To set the maximum amount of outstanding clients, use
1354 * g_socket_set_listen_backlog().
1356 * Returns: %TRUE on success, %FALSE on error.
1361 g_socket_listen (GSocket *socket,
1364 g_return_val_if_fail (G_IS_SOCKET (socket), FALSE);
1366 if (!check_socket (socket, error))
1369 if (listen (socket->priv->fd, socket->priv->listen_backlog) < 0)
1371 int errsv = get_socket_errno ();
1373 g_set_error (error, G_IO_ERROR, socket_io_error_from_errno (errsv),
1374 _("could not listen: %s"), socket_strerror (errsv));
1378 socket->priv->listening = TRUE;
1385 * @socket: a #GSocket.
1386 * @address: a #GSocketAddress specifying the local address.
1387 * @allow_reuse: whether to allow reusing this address
1388 * @error: #GError for error reporting, or %NULL to ignore.
1390 * When a socket is created it is attached to an address family, but it
1391 * doesn't have an address in this family. g_socket_bind() assigns the
1392 * address (sometimes called name) of the socket.
1394 * It is generally required to bind to a local address before you can
1395 * receive connections. (See g_socket_listen() and g_socket_accept() ).
1396 * In certain situations, you may also want to bind a socket that will be
1397 * used to initiate connections, though this is not normally required.
1399 * @allow_reuse should be %TRUE for server sockets (sockets that you will
1400 * eventually call g_socket_accept() on), and %FALSE for client sockets.
1401 * (Specifically, if it is %TRUE, then g_socket_bind() will set the
1402 * %SO_REUSEADDR flag on the socket, allowing it to bind @address even if
1403 * that address was previously used by another socket that has not yet been
1404 * fully cleaned-up by the kernel. Failing to set this flag on a server
1405 * socket may cause the bind call to return %G_IO_ERROR_ADDRESS_IN_USE if
1406 * the server program is stopped and then immediately restarted.)
1408 * Returns: %TRUE on success, %FALSE on error.
1413 g_socket_bind (GSocket *socket,
1414 GSocketAddress *address,
1415 gboolean reuse_address,
1418 struct sockaddr_storage addr;
1420 g_return_val_if_fail (G_IS_SOCKET (socket) && G_IS_SOCKET_ADDRESS (address), FALSE);
1422 if (!check_socket (socket, error))
1425 /* SO_REUSEADDR on windows means something else and is not what we want.
1426 It always allows the unix variant of SO_REUSEADDR anyway */
1431 value = (int) !!reuse_address;
1432 /* Ignore errors here, the only likely error is "not supported", and
1433 this is a "best effort" thing mainly */
1434 setsockopt (socket->priv->fd, SOL_SOCKET, SO_REUSEADDR,
1435 (gpointer) &value, sizeof (value));
1439 if (!g_socket_address_to_native (address, &addr, sizeof addr, error))
1442 if (bind (socket->priv->fd, (struct sockaddr *) &addr,
1443 g_socket_address_get_native_size (address)) < 0)
1445 int errsv = get_socket_errno ();
1447 G_IO_ERROR, socket_io_error_from_errno (errsv),
1448 _("Error binding to address: %s"), socket_strerror (errsv));
1456 * g_socket_speaks_ipv4:
1457 * @socket: a #GSocket
1459 * Checks if a socket is capable of speaking IPv4.
1461 * IPv4 sockets are capable of speaking IPv4. On some operating systems
1462 * and under some combinations of circumstances IPv6 sockets are also
1463 * capable of speaking IPv4. See RFC 3493 section 3.7 for more
1466 * No other types of sockets are currently considered as being capable
1469 * Returns: %TRUE if this socket can be used with IPv4.
1474 g_socket_speaks_ipv4 (GSocket *socket)
1476 switch (socket->priv->family)
1478 case G_SOCKET_FAMILY_IPV4:
1481 case G_SOCKET_FAMILY_IPV6:
1482 #if defined (IPPROTO_IPV6) && defined (IPV6_V6ONLY)
1484 guint sizeof_int = sizeof (int);
1487 if (getsockopt (socket->priv->fd,
1488 IPPROTO_IPV6, IPV6_V6ONLY,
1489 &v6_only, &sizeof_int) != 0)
1505 * @socket: a #GSocket.
1506 * @cancellable: (allow-none): a %GCancellable or %NULL
1507 * @error: #GError for error reporting, or %NULL to ignore.
1509 * Accept incoming connections on a connection-based socket. This removes
1510 * the first outstanding connection request from the listening socket and
1511 * creates a #GSocket object for it.
1513 * The @socket must be bound to a local address with g_socket_bind() and
1514 * must be listening for incoming connections (g_socket_listen()).
1516 * If there are no outstanding connections then the operation will block
1517 * or return %G_IO_ERROR_WOULD_BLOCK if non-blocking I/O is enabled.
1518 * To be notified of an incoming connection, wait for the %G_IO_IN condition.
1520 * Returns: (transfer full): a new #GSocket, or %NULL on error.
1521 * Free the returned object with g_object_unref().
1526 g_socket_accept (GSocket *socket,
1527 GCancellable *cancellable,
1530 GSocket *new_socket;
1533 g_return_val_if_fail (G_IS_SOCKET (socket), NULL);
1535 if (!check_socket (socket, error))
1540 if (socket->priv->blocking &&
1541 !g_socket_condition_wait (socket,
1542 G_IO_IN, cancellable, error))
1545 if ((ret = accept (socket->priv->fd, NULL, 0)) < 0)
1547 int errsv = get_socket_errno ();
1549 win32_unset_event_mask (socket, FD_ACCEPT);
1554 if (socket->priv->blocking)
1556 #ifdef WSAEWOULDBLOCK
1557 if (errsv == WSAEWOULDBLOCK)
1560 if (errsv == EWOULDBLOCK ||
1566 g_set_error (error, G_IO_ERROR,
1567 socket_io_error_from_errno (errsv),
1568 _("Error accepting connection: %s"), socket_strerror (errsv));
1574 win32_unset_event_mask (socket, FD_ACCEPT);
1578 /* The socket inherits the accepting sockets event mask and even object,
1579 we need to remove that */
1580 WSAEventSelect (ret, NULL, 0);
1586 /* We always want to set close-on-exec to protect users. If you
1587 need to so some weird inheritance to exec you can re-enable this
1588 using lower level hacks with g_socket_get_fd(). */
1589 flags = fcntl (ret, F_GETFD, 0);
1591 (flags & FD_CLOEXEC) == 0)
1593 flags |= FD_CLOEXEC;
1594 fcntl (ret, F_SETFD, flags);
1599 new_socket = g_socket_new_from_fd (ret, error);
1600 if (new_socket == NULL)
1609 new_socket->priv->protocol = socket->priv->protocol;
1616 * @socket: a #GSocket.
1617 * @address: a #GSocketAddress specifying the remote address.
1618 * @cancellable: (allow-none): a %GCancellable or %NULL
1619 * @error: #GError for error reporting, or %NULL to ignore.
1621 * Connect the socket to the specified remote address.
1623 * For connection oriented socket this generally means we attempt to make
1624 * a connection to the @address. For a connection-less socket it sets
1625 * the default address for g_socket_send() and discards all incoming datagrams
1626 * from other sources.
1628 * Generally connection oriented sockets can only connect once, but
1629 * connection-less sockets can connect multiple times to change the
1632 * If the connect call needs to do network I/O it will block, unless
1633 * non-blocking I/O is enabled. Then %G_IO_ERROR_PENDING is returned
1634 * and the user can be notified of the connection finishing by waiting
1635 * for the G_IO_OUT condition. The result of the connection must then be
1636 * checked with g_socket_check_connect_result().
1638 * Returns: %TRUE if connected, %FALSE on error.
1643 g_socket_connect (GSocket *socket,
1644 GSocketAddress *address,
1645 GCancellable *cancellable,
1648 struct sockaddr_storage buffer;
1650 g_return_val_if_fail (G_IS_SOCKET (socket) && G_IS_SOCKET_ADDRESS (address), FALSE);
1652 if (!check_socket (socket, error))
1655 if (!g_socket_address_to_native (address, &buffer, sizeof buffer, error))
1658 if (socket->priv->remote_address)
1659 g_object_unref (socket->priv->remote_address);
1660 socket->priv->remote_address = g_object_ref (address);
1664 if (connect (socket->priv->fd, (struct sockaddr *) &buffer,
1665 g_socket_address_get_native_size (address)) < 0)
1667 int errsv = get_socket_errno ();
1673 if (errsv == EINPROGRESS)
1675 if (errsv == WSAEWOULDBLOCK)
1678 if (socket->priv->blocking)
1680 if (g_socket_condition_wait (socket, G_IO_OUT, cancellable, error))
1682 if (g_socket_check_connect_result (socket, error))
1688 g_set_error_literal (error, G_IO_ERROR, G_IO_ERROR_PENDING,
1689 _("Connection in progress"));
1690 socket->priv->connect_pending = TRUE;
1694 g_set_error_literal (error, G_IO_ERROR,
1695 socket_io_error_from_errno (errsv),
1696 socket_strerror (errsv));
1703 win32_unset_event_mask (socket, FD_CONNECT);
1705 socket->priv->connected = TRUE;
1711 * g_socket_check_connect_result:
1712 * @socket: a #GSocket
1713 * @error: #GError for error reporting, or %NULL to ignore.
1715 * Checks and resets the pending connect error for the socket.
1716 * This is used to check for errors when g_socket_connect() is
1717 * used in non-blocking mode.
1719 * Returns: %TRUE if no error, %FALSE otherwise, setting @error to the error
1724 g_socket_check_connect_result (GSocket *socket,
1730 g_return_val_if_fail (G_IS_SOCKET (socket), FALSE);
1732 if (!check_socket (socket, error))
1735 optlen = sizeof (value);
1736 if (getsockopt (socket->priv->fd, SOL_SOCKET, SO_ERROR, (void *)&value, &optlen) != 0)
1738 int errsv = get_socket_errno ();
1740 g_set_error (error, G_IO_ERROR, socket_io_error_from_errno (errsv),
1741 _("Unable to get pending error: %s"), socket_strerror (errsv));
1747 g_set_error_literal (error, G_IO_ERROR, socket_io_error_from_errno (value),
1748 socket_strerror (value));
1749 if (socket->priv->remote_address)
1751 g_object_unref (socket->priv->remote_address);
1752 socket->priv->remote_address = NULL;
1757 socket->priv->connected = TRUE;
1763 * @socket: a #GSocket
1764 * @buffer: a buffer to read data into (which should be at least @size
1766 * @size: the number of bytes you want to read from the socket
1767 * @cancellable: (allow-none): a %GCancellable or %NULL
1768 * @error: #GError for error reporting, or %NULL to ignore.
1770 * Receive data (up to @size bytes) from a socket. This is mainly used by
1771 * connection-oriented sockets; it is identical to g_socket_receive_from()
1772 * with @address set to %NULL.
1774 * For %G_SOCKET_TYPE_DATAGRAM and %G_SOCKET_TYPE_SEQPACKET sockets,
1775 * g_socket_receive() will always read either 0 or 1 complete messages from
1776 * the socket. If the received message is too large to fit in @buffer, then
1777 * the data beyond @size bytes will be discarded, without any explicit
1778 * indication that this has occurred.
1780 * For %G_SOCKET_TYPE_STREAM sockets, g_socket_receive() can return any
1781 * number of bytes, up to @size. If more than @size bytes have been
1782 * received, the additional data will be returned in future calls to
1783 * g_socket_receive().
1785 * If the socket is in blocking mode the call will block until there
1786 * is some data to receive, the connection is closed, or there is an
1787 * error. If there is no data available and the socket is in
1788 * non-blocking mode, a %G_IO_ERROR_WOULD_BLOCK error will be
1789 * returned. To be notified when data is available, wait for the
1790 * %G_IO_IN condition.
1792 * On error -1 is returned and @error is set accordingly.
1794 * Returns: Number of bytes read, or 0 if the connection was closed by
1795 * the peer, or -1 on error
1800 g_socket_receive (GSocket *socket,
1803 GCancellable *cancellable,
1806 return g_socket_receive_with_blocking (socket, buffer, size,
1807 socket->priv->blocking,
1808 cancellable, error);
1812 * g_socket_receive_with_blocking:
1813 * @socket: a #GSocket
1814 * @buffer: a buffer to read data into (which should be at least @size
1816 * @size: the number of bytes you want to read from the socket
1817 * @blocking: whether to do blocking or non-blocking I/O
1818 * @cancellable: (allow-none): a %GCancellable or %NULL
1819 * @error: #GError for error reporting, or %NULL to ignore.
1821 * This behaves exactly the same as g_socket_receive(), except that
1822 * the choice of blocking or non-blocking behavior is determined by
1823 * the @blocking argument rather than by @socket's properties.
1825 * Returns: Number of bytes read, or 0 if the connection was closed by
1826 * the peer, or -1 on error
1831 g_socket_receive_with_blocking (GSocket *socket,
1835 GCancellable *cancellable,
1840 g_return_val_if_fail (G_IS_SOCKET (socket) && buffer != NULL, FALSE);
1842 if (!check_socket (socket, error))
1845 if (g_cancellable_set_error_if_cancelled (cancellable, error))
1851 !g_socket_condition_wait (socket,
1852 G_IO_IN, cancellable, error))
1855 if ((ret = recv (socket->priv->fd, buffer, size, 0)) < 0)
1857 int errsv = get_socket_errno ();
1864 #ifdef WSAEWOULDBLOCK
1865 if (errsv == WSAEWOULDBLOCK)
1868 if (errsv == EWOULDBLOCK ||
1874 win32_unset_event_mask (socket, FD_READ);
1876 g_set_error (error, G_IO_ERROR,
1877 socket_io_error_from_errno (errsv),
1878 _("Error receiving data: %s"), socket_strerror (errsv));
1882 win32_unset_event_mask (socket, FD_READ);
1891 * g_socket_receive_from:
1892 * @socket: a #GSocket
1893 * @address: a pointer to a #GSocketAddress pointer, or %NULL
1894 * @buffer: a buffer to read data into (which should be at least @size
1896 * @size: the number of bytes you want to read from the socket
1897 * @cancellable: (allow-none): a %GCancellable or %NULL
1898 * @error: #GError for error reporting, or %NULL to ignore.
1900 * Receive data (up to @size bytes) from a socket.
1902 * If @address is non-%NULL then @address will be set equal to the
1903 * source address of the received packet.
1904 * @address is owned by the caller.
1906 * See g_socket_receive() for additional information.
1908 * Returns: Number of bytes read, or 0 if the connection was closed by
1909 * the peer, or -1 on error
1914 g_socket_receive_from (GSocket *socket,
1915 GSocketAddress **address,
1918 GCancellable *cancellable,
1926 return g_socket_receive_message (socket,
1934 /* Although we ignore SIGPIPE, gdb will still stop if the app receives
1935 * one, which can be confusing and annoying. So if possible, we want
1936 * to suppress the signal entirely.
1939 #define G_SOCKET_DEFAULT_SEND_FLAGS MSG_NOSIGNAL
1941 #define G_SOCKET_DEFAULT_SEND_FLAGS 0
1946 * @socket: a #GSocket
1947 * @buffer: (array length=size): the buffer containing the data to send.
1948 * @size: the number of bytes to send
1949 * @cancellable: (allow-none): a %GCancellable or %NULL
1950 * @error: #GError for error reporting, or %NULL to ignore.
1952 * Tries to send @size bytes from @buffer on the socket. This is
1953 * mainly used by connection-oriented sockets; it is identical to
1954 * g_socket_send_to() with @address set to %NULL.
1956 * If the socket is in blocking mode the call will block until there is
1957 * space for the data in the socket queue. If there is no space available
1958 * and the socket is in non-blocking mode a %G_IO_ERROR_WOULD_BLOCK error
1959 * will be returned. To be notified when space is available, wait for the
1960 * %G_IO_OUT condition. Note though that you may still receive
1961 * %G_IO_ERROR_WOULD_BLOCK from g_socket_send() even if you were previously
1962 * notified of a %G_IO_OUT condition. (On Windows in particular, this is
1963 * very common due to the way the underlying APIs work.)
1965 * On error -1 is returned and @error is set accordingly.
1967 * Returns: Number of bytes written (which may be less than @size), or -1
1973 g_socket_send (GSocket *socket,
1974 const gchar *buffer,
1976 GCancellable *cancellable,
1979 return g_socket_send_with_blocking (socket, buffer, size,
1980 socket->priv->blocking,
1981 cancellable, error);
1985 * g_socket_send_with_blocking:
1986 * @socket: a #GSocket
1987 * @buffer: (array length=size): the buffer containing the data to send.
1988 * @size: the number of bytes to send
1989 * @blocking: whether to do blocking or non-blocking I/O
1990 * @cancellable: (allow-none): a %GCancellable or %NULL
1991 * @error: #GError for error reporting, or %NULL to ignore.
1993 * This behaves exactly the same as g_socket_send(), except that
1994 * the choice of blocking or non-blocking behavior is determined by
1995 * the @blocking argument rather than by @socket's properties.
1997 * Returns: Number of bytes written (which may be less than @size), or -1
2003 g_socket_send_with_blocking (GSocket *socket,
2004 const gchar *buffer,
2007 GCancellable *cancellable,
2012 g_return_val_if_fail (G_IS_SOCKET (socket) && buffer != NULL, FALSE);
2014 if (!check_socket (socket, error))
2017 if (g_cancellable_set_error_if_cancelled (cancellable, error))
2023 !g_socket_condition_wait (socket,
2024 G_IO_OUT, cancellable, error))
2027 if ((ret = send (socket->priv->fd, buffer, size, G_SOCKET_DEFAULT_SEND_FLAGS)) < 0)
2029 int errsv = get_socket_errno ();
2034 #ifdef WSAEWOULDBLOCK
2035 if (errsv == WSAEWOULDBLOCK)
2036 win32_unset_event_mask (socket, FD_WRITE);
2041 #ifdef WSAEWOULDBLOCK
2042 if (errsv == WSAEWOULDBLOCK)
2045 if (errsv == EWOULDBLOCK ||
2051 g_set_error (error, G_IO_ERROR,
2052 socket_io_error_from_errno (errsv),
2053 _("Error sending data: %s"), socket_strerror (errsv));
2064 * @socket: a #GSocket
2065 * @address: a #GSocketAddress, or %NULL
2066 * @buffer: (array length=size): the buffer containing the data to send.
2067 * @size: the number of bytes to send
2068 * @cancellable: (allow-none): a %GCancellable or %NULL
2069 * @error: #GError for error reporting, or %NULL to ignore.
2071 * Tries to send @size bytes from @buffer to @address. If @address is
2072 * %NULL then the message is sent to the default receiver (set by
2073 * g_socket_connect()).
2075 * See g_socket_send() for additional information.
2077 * Returns: Number of bytes written (which may be less than @size), or -1
2083 g_socket_send_to (GSocket *socket,
2084 GSocketAddress *address,
2085 const gchar *buffer,
2087 GCancellable *cancellable,
2095 return g_socket_send_message (socket,
2105 * g_socket_shutdown:
2106 * @socket: a #GSocket
2107 * @shutdown_read: whether to shut down the read side
2108 * @shutdown_write: whether to shut down the write side
2109 * @error: #GError for error reporting, or %NULL to ignore.
2111 * Shut down part of a full-duplex connection.
2113 * If @shutdown_read is %TRUE then the receiving side of the connection
2114 * is shut down, and further reading is disallowed.
2116 * If @shutdown_write is %TRUE then the sending side of the connection
2117 * is shut down, and further writing is disallowed.
2119 * It is allowed for both @shutdown_read and @shutdown_write to be %TRUE.
2121 * One example where this is used is graceful disconnect for TCP connections
2122 * where you close the sending side, then wait for the other side to close
2123 * the connection, thus ensuring that the other side saw all sent data.
2125 * Returns: %TRUE on success, %FALSE on error
2130 g_socket_shutdown (GSocket *socket,
2131 gboolean shutdown_read,
2132 gboolean shutdown_write,
2137 g_return_val_if_fail (G_IS_SOCKET (socket), TRUE);
2139 if (!check_socket (socket, error))
2143 if (!shutdown_read && !shutdown_write)
2147 if (shutdown_read && shutdown_write)
2149 else if (shutdown_read)
2154 if (shutdown_read && shutdown_write)
2156 else if (shutdown_read)
2162 if (shutdown (socket->priv->fd, how) != 0)
2164 int errsv = get_socket_errno ();
2165 g_set_error (error, G_IO_ERROR, socket_io_error_from_errno (errsv),
2166 _("Unable to shutdown socket: %s"), socket_strerror (errsv));
2170 if (shutdown_read && shutdown_write)
2171 socket->priv->connected = FALSE;
2178 * @socket: a #GSocket
2179 * @error: #GError for error reporting, or %NULL to ignore.
2181 * Closes the socket, shutting down any active connection.
2183 * Closing a socket does not wait for all outstanding I/O operations
2184 * to finish, so the caller should not rely on them to be guaranteed
2185 * to complete even if the close returns with no error.
2187 * Once the socket is closed, all other operations will return
2188 * %G_IO_ERROR_CLOSED. Closing a socket multiple times will not
2191 * Sockets will be automatically closed when the last reference
2192 * is dropped, but you might want to call this function to make sure
2193 * resources are released as early as possible.
2195 * Beware that due to the way that TCP works, it is possible for
2196 * recently-sent data to be lost if either you close a socket while the
2197 * %G_IO_IN condition is set, or else if the remote connection tries to
2198 * send something to you after you close the socket but before it has
2199 * finished reading all of the data you sent. There is no easy generic
2200 * way to avoid this problem; the easiest fix is to design the network
2201 * protocol such that the client will never send data "out of turn".
2202 * Another solution is for the server to half-close the connection by
2203 * calling g_socket_shutdown() with only the @shutdown_write flag set,
2204 * and then wait for the client to notice this and close its side of the
2205 * connection, after which the server can safely call g_socket_close().
2206 * (This is what #GTcpConnection does if you call
2207 * g_tcp_connection_set_graceful_disconnect(). But of course, this
2208 * only works if the client will close its connection after the server
2211 * Returns: %TRUE on success, %FALSE on error
2216 g_socket_close (GSocket *socket,
2221 g_return_val_if_fail (G_IS_SOCKET (socket), TRUE);
2223 if (socket->priv->closed)
2224 return TRUE; /* Multiple close not an error */
2226 if (!check_socket (socket, error))
2232 res = closesocket (socket->priv->fd);
2234 res = close (socket->priv->fd);
2238 int errsv = get_socket_errno ();
2243 g_set_error (error, G_IO_ERROR,
2244 socket_io_error_from_errno (errsv),
2245 _("Error closing socket: %s"),
2246 socket_strerror (errsv));
2252 socket->priv->connected = FALSE;
2253 socket->priv->closed = TRUE;
2254 if (socket->priv->remote_address)
2256 g_object_unref (socket->priv->remote_address);
2257 socket->priv->remote_address = NULL;
2264 * g_socket_is_closed:
2265 * @socket: a #GSocket
2267 * Checks whether a socket is closed.
2269 * Returns: %TRUE if socket is closed, %FALSE otherwise
2274 g_socket_is_closed (GSocket *socket)
2276 return socket->priv->closed;
2280 /* Broken source, used on errors */
2282 broken_prepare (GSource *source,
2289 broken_check (GSource *source)
2295 broken_dispatch (GSource *source,
2296 GSourceFunc callback,
2302 static GSourceFuncs broken_funcs =
2311 network_events_for_condition (GIOCondition condition)
2315 if (condition & G_IO_IN)
2316 event_mask |= (FD_READ | FD_ACCEPT);
2317 if (condition & G_IO_OUT)
2318 event_mask |= (FD_WRITE | FD_CONNECT);
2319 event_mask |= FD_CLOSE;
2325 ensure_event (GSocket *socket)
2327 if (socket->priv->event == WSA_INVALID_EVENT)
2328 socket->priv->event = WSACreateEvent();
2332 update_select_events (GSocket *socket)
2339 ensure_event (socket);
2342 for (l = socket->priv->requested_conditions; l != NULL; l = l->next)
2345 event_mask |= network_events_for_condition (*ptr);
2348 if (event_mask != socket->priv->selected_events)
2350 /* If no events selected, disable event so we can unset
2353 if (event_mask == 0)
2356 event = socket->priv->event;
2358 if (WSAEventSelect (socket->priv->fd, event, event_mask) == 0)
2359 socket->priv->selected_events = event_mask;
2364 add_condition_watch (GSocket *socket,
2365 GIOCondition *condition)
2367 g_assert (g_list_find (socket->priv->requested_conditions, condition) == NULL);
2369 socket->priv->requested_conditions =
2370 g_list_prepend (socket->priv->requested_conditions, condition);
2372 update_select_events (socket);
2376 remove_condition_watch (GSocket *socket,
2377 GIOCondition *condition)
2379 g_assert (g_list_find (socket->priv->requested_conditions, condition) != NULL);
2381 socket->priv->requested_conditions =
2382 g_list_remove (socket->priv->requested_conditions, condition);
2384 update_select_events (socket);
2388 update_condition (GSocket *socket)
2390 WSANETWORKEVENTS events;
2391 GIOCondition condition;
2393 if (WSAEnumNetworkEvents (socket->priv->fd,
2394 socket->priv->event,
2397 socket->priv->current_events |= events.lNetworkEvents;
2398 if (events.lNetworkEvents & FD_WRITE &&
2399 events.iErrorCode[FD_WRITE_BIT] != 0)
2400 socket->priv->current_errors |= FD_WRITE;
2401 if (events.lNetworkEvents & FD_CONNECT &&
2402 events.iErrorCode[FD_CONNECT_BIT] != 0)
2403 socket->priv->current_errors |= FD_CONNECT;
2407 if (socket->priv->current_events & (FD_READ | FD_ACCEPT))
2408 condition |= G_IO_IN;
2410 if (socket->priv->current_events & FD_CLOSE ||
2411 socket->priv->closed)
2412 condition |= G_IO_HUP;
2414 /* Never report both G_IO_OUT and HUP, these are
2415 mutually exclusive (can't write to a closed socket) */
2416 if ((condition & G_IO_HUP) == 0 &&
2417 socket->priv->current_events & FD_WRITE)
2419 if (socket->priv->current_errors & FD_WRITE)
2420 condition |= G_IO_ERR;
2422 condition |= G_IO_OUT;
2426 if (socket->priv->current_events & FD_CONNECT)
2428 if (socket->priv->current_errors & FD_CONNECT)
2429 condition |= (G_IO_HUP | G_IO_ERR);
2431 condition |= G_IO_OUT;
2443 GIOCondition condition;
2444 GCancellable *cancellable;
2445 GPollFD cancel_pollfd;
2446 gint64 timeout_time;
2450 socket_source_prepare (GSource *source,
2453 GSocketSource *socket_source = (GSocketSource *)source;
2455 if (g_cancellable_is_cancelled (socket_source->cancellable))
2458 if (socket_source->timeout_time)
2462 now = g_source_get_time (source);
2463 /* Round up to ensure that we don't try again too early */
2464 *timeout = (socket_source->timeout_time - now + 999) / 1000;
2467 socket_source->socket->priv->timed_out = TRUE;
2476 socket_source->pollfd.revents = update_condition (socket_source->socket);
2479 if ((socket_source->condition & socket_source->pollfd.revents) != 0)
2486 socket_source_check (GSource *source)
2490 return socket_source_prepare (source, &timeout);
2494 socket_source_dispatch (GSource *source,
2495 GSourceFunc callback,
2498 GSocketSourceFunc func = (GSocketSourceFunc)callback;
2499 GSocketSource *socket_source = (GSocketSource *)source;
2502 socket_source->pollfd.revents = update_condition (socket_source->socket);
2504 if (socket_source->socket->priv->timed_out)
2505 socket_source->pollfd.revents |= socket_source->condition & (G_IO_IN | G_IO_OUT);
2507 return (*func) (socket_source->socket,
2508 socket_source->pollfd.revents & socket_source->condition,
2513 socket_source_finalize (GSource *source)
2515 GSocketSource *socket_source = (GSocketSource *)source;
2518 socket = socket_source->socket;
2521 remove_condition_watch (socket, &socket_source->condition);
2524 g_object_unref (socket);
2526 if (socket_source->cancellable)
2528 g_cancellable_release_fd (socket_source->cancellable);
2529 g_object_unref (socket_source->cancellable);
2534 socket_source_closure_callback (GSocket *socket,
2535 GIOCondition condition,
2538 GClosure *closure = data;
2540 GValue params[2] = { G_VALUE_INIT, G_VALUE_INIT };
2541 GValue result_value = G_VALUE_INIT;
2544 g_value_init (&result_value, G_TYPE_BOOLEAN);
2546 g_value_init (¶ms[0], G_TYPE_SOCKET);
2547 g_value_set_object (¶ms[0], socket);
2548 g_value_init (¶ms[1], G_TYPE_IO_CONDITION);
2549 g_value_set_flags (¶ms[1], condition);
2551 g_closure_invoke (closure, &result_value, 2, params, NULL);
2553 result = g_value_get_boolean (&result_value);
2554 g_value_unset (&result_value);
2555 g_value_unset (¶ms[0]);
2556 g_value_unset (¶ms[1]);
2561 static GSourceFuncs socket_source_funcs =
2563 socket_source_prepare,
2564 socket_source_check,
2565 socket_source_dispatch,
2566 socket_source_finalize,
2567 (GSourceFunc)socket_source_closure_callback,
2568 (GSourceDummyMarshal)g_cclosure_marshal_generic,
2572 socket_source_new (GSocket *socket,
2573 GIOCondition condition,
2574 GCancellable *cancellable)
2577 GSocketSource *socket_source;
2580 ensure_event (socket);
2582 if (socket->priv->event == WSA_INVALID_EVENT)
2584 g_warning ("Failed to create WSAEvent");
2585 return g_source_new (&broken_funcs, sizeof (GSource));
2589 condition |= G_IO_HUP | G_IO_ERR;
2591 source = g_source_new (&socket_source_funcs, sizeof (GSocketSource));
2592 g_source_set_name (source, "GSocket");
2593 socket_source = (GSocketSource *)source;
2595 socket_source->socket = g_object_ref (socket);
2596 socket_source->condition = condition;
2598 if (g_cancellable_make_pollfd (cancellable,
2599 &socket_source->cancel_pollfd))
2601 socket_source->cancellable = g_object_ref (cancellable);
2602 g_source_add_poll (source, &socket_source->cancel_pollfd);
2606 add_condition_watch (socket, &socket_source->condition);
2607 socket_source->pollfd.fd = (gintptr) socket->priv->event;
2609 socket_source->pollfd.fd = socket->priv->fd;
2612 socket_source->pollfd.events = condition;
2613 socket_source->pollfd.revents = 0;
2614 g_source_add_poll (source, &socket_source->pollfd);
2616 if (socket->priv->timeout)
2617 socket_source->timeout_time = g_get_monotonic_time () +
2618 socket->priv->timeout * 1000000;
2621 socket_source->timeout_time = 0;
2627 * g_socket_create_source: (skip)
2628 * @socket: a #GSocket
2629 * @condition: a #GIOCondition mask to monitor
2630 * @cancellable: (allow-none): a %GCancellable or %NULL
2632 * Creates a %GSource that can be attached to a %GMainContext to monitor
2633 * for the availibility of the specified @condition on the socket.
2635 * The callback on the source is of the #GSocketSourceFunc type.
2637 * It is meaningless to specify %G_IO_ERR or %G_IO_HUP in @condition;
2638 * these conditions will always be reported output if they are true.
2640 * @cancellable if not %NULL can be used to cancel the source, which will
2641 * cause the source to trigger, reporting the current condition (which
2642 * is likely 0 unless cancellation happened at the same time as a
2643 * condition change). You can check for this in the callback using
2644 * g_cancellable_is_cancelled().
2646 * If @socket has a timeout set, and it is reached before @condition
2647 * occurs, the source will then trigger anyway, reporting %G_IO_IN or
2648 * %G_IO_OUT depending on @condition. However, @socket will have been
2649 * marked as having had a timeout, and so the next #GSocket I/O method
2650 * you call will then fail with a %G_IO_ERROR_TIMED_OUT.
2652 * Returns: (transfer full): a newly allocated %GSource, free with g_source_unref().
2657 g_socket_create_source (GSocket *socket,
2658 GIOCondition condition,
2659 GCancellable *cancellable)
2661 g_return_val_if_fail (G_IS_SOCKET (socket) && (cancellable == NULL || G_IS_CANCELLABLE (cancellable)), NULL);
2663 return socket_source_new (socket, condition, cancellable);
2667 * g_socket_condition_check:
2668 * @socket: a #GSocket
2669 * @condition: a #GIOCondition mask to check
2671 * Checks on the readiness of @socket to perform operations.
2672 * The operations specified in @condition are checked for and masked
2673 * against the currently-satisfied conditions on @socket. The result
2676 * Note that on Windows, it is possible for an operation to return
2677 * %G_IO_ERROR_WOULD_BLOCK even immediately after
2678 * g_socket_condition_check() has claimed that the socket is ready for
2679 * writing. Rather than calling g_socket_condition_check() and then
2680 * writing to the socket if it succeeds, it is generally better to
2681 * simply try writing to the socket right away, and try again later if
2682 * the initial attempt returns %G_IO_ERROR_WOULD_BLOCK.
2684 * It is meaningless to specify %G_IO_ERR or %G_IO_HUP in condition;
2685 * these conditions will always be set in the output if they are true.
2687 * This call never blocks.
2689 * Returns: the @GIOCondition mask of the current state
2694 g_socket_condition_check (GSocket *socket,
2695 GIOCondition condition)
2697 g_return_val_if_fail (G_IS_SOCKET (socket), 0);
2699 if (!check_socket (socket, NULL))
2704 GIOCondition current_condition;
2706 condition |= G_IO_ERR | G_IO_HUP;
2708 add_condition_watch (socket, &condition);
2709 current_condition = update_condition (socket);
2710 remove_condition_watch (socket, &condition);
2711 return condition & current_condition;
2717 poll_fd.fd = socket->priv->fd;
2718 poll_fd.events = condition;
2721 result = g_poll (&poll_fd, 1, 0);
2722 while (result == -1 && get_socket_errno () == EINTR);
2724 return poll_fd.revents;
2730 * g_socket_condition_wait:
2731 * @socket: a #GSocket
2732 * @condition: a #GIOCondition mask to wait for
2733 * @cancellable: (allow-none): a #GCancellable, or %NULL
2734 * @error: a #GError pointer, or %NULL
2736 * Waits for @condition to become true on @socket. When the condition
2737 * is met, %TRUE is returned.
2739 * If @cancellable is cancelled before the condition is met, or if the
2740 * socket has a timeout set and it is reached before the condition is
2741 * met, then %FALSE is returned and @error, if non-%NULL, is set to
2742 * the appropriate value (%G_IO_ERROR_CANCELLED or
2743 * %G_IO_ERROR_TIMED_OUT).
2745 * Returns: %TRUE if the condition was met, %FALSE otherwise
2750 g_socket_condition_wait (GSocket *socket,
2751 GIOCondition condition,
2752 GCancellable *cancellable,
2755 g_return_val_if_fail (G_IS_SOCKET (socket), FALSE);
2757 if (!check_socket (socket, error))
2760 if (g_cancellable_set_error_if_cancelled (cancellable, error))
2765 GIOCondition current_condition;
2771 /* Always check these */
2772 condition |= G_IO_ERR | G_IO_HUP;
2774 add_condition_watch (socket, &condition);
2777 events[num_events++] = socket->priv->event;
2779 if (g_cancellable_make_pollfd (cancellable, &cancel_fd))
2780 events[num_events++] = (WSAEVENT)cancel_fd.fd;
2782 if (socket->priv->timeout)
2783 timeout = socket->priv->timeout * 1000;
2785 timeout = WSA_INFINITE;
2787 current_condition = update_condition (socket);
2788 while ((condition & current_condition) == 0)
2790 res = WSAWaitForMultipleEvents(num_events, events,
2791 FALSE, timeout, FALSE);
2792 if (res == WSA_WAIT_FAILED)
2794 int errsv = get_socket_errno ();
2796 g_set_error (error, G_IO_ERROR,
2797 socket_io_error_from_errno (errsv),
2798 _("Waiting for socket condition: %s"),
2799 socket_strerror (errsv));
2802 else if (res == WSA_WAIT_TIMEOUT)
2804 g_set_error_literal (error, G_IO_ERROR, G_IO_ERROR_TIMED_OUT,
2805 _("Socket I/O timed out"));
2809 if (g_cancellable_set_error_if_cancelled (cancellable, error))
2812 current_condition = update_condition (socket);
2814 remove_condition_watch (socket, &condition);
2816 g_cancellable_release_fd (cancellable);
2818 return (condition & current_condition) != 0;
2827 poll_fd[0].fd = socket->priv->fd;
2828 poll_fd[0].events = condition;
2831 if (g_cancellable_make_pollfd (cancellable, &poll_fd[1]))
2834 if (socket->priv->timeout)
2835 timeout = socket->priv->timeout * 1000;
2840 result = g_poll (poll_fd, num, timeout);
2841 while (result == -1 && get_socket_errno () == EINTR);
2844 g_cancellable_release_fd (cancellable);
2848 g_set_error_literal (error, G_IO_ERROR, G_IO_ERROR_TIMED_OUT,
2849 _("Socket I/O timed out"));
2853 return !g_cancellable_set_error_if_cancelled (cancellable, error);
2859 * g_socket_send_message:
2860 * @socket: a #GSocket
2861 * @address: a #GSocketAddress, or %NULL
2862 * @vectors: (array length=num_vectors): an array of #GOutputVector structs
2863 * @num_vectors: the number of elements in @vectors, or -1
2864 * @messages: (array length=num_messages) (allow-none): a pointer to an
2865 * array of #GSocketControlMessages, or %NULL.
2866 * @num_messages: number of elements in @messages, or -1.
2867 * @flags: an int containing #GSocketMsgFlags flags
2868 * @cancellable: (allow-none): a %GCancellable or %NULL
2869 * @error: #GError for error reporting, or %NULL to ignore.
2871 * Send data to @address on @socket. This is the most complicated and
2872 * fully-featured version of this call. For easier use, see
2873 * g_socket_send() and g_socket_send_to().
2875 * If @address is %NULL then the message is sent to the default receiver
2876 * (set by g_socket_connect()).
2878 * @vectors must point to an array of #GOutputVector structs and
2879 * @num_vectors must be the length of this array. (If @num_vectors is -1,
2880 * then @vectors is assumed to be terminated by a #GOutputVector with a
2881 * %NULL buffer pointer.) The #GOutputVector structs describe the buffers
2882 * that the sent data will be gathered from. Using multiple
2883 * #GOutputVector<!-- -->s is more memory-efficient than manually copying
2884 * data from multiple sources into a single buffer, and more
2885 * network-efficient than making multiple calls to g_socket_send().
2887 * @messages, if non-%NULL, is taken to point to an array of @num_messages
2888 * #GSocketControlMessage instances. These correspond to the control
2889 * messages to be sent on the socket.
2890 * If @num_messages is -1 then @messages is treated as a %NULL-terminated
2893 * @flags modify how the message is sent. The commonly available arguments
2894 * for this are available in the #GSocketMsgFlags enum, but the
2895 * values there are the same as the system values, and the flags
2896 * are passed in as-is, so you can pass in system-specific flags too.
2898 * If the socket is in blocking mode the call will block until there is
2899 * space for the data in the socket queue. If there is no space available
2900 * and the socket is in non-blocking mode a %G_IO_ERROR_WOULD_BLOCK error
2901 * will be returned. To be notified when space is available, wait for the
2902 * %G_IO_OUT condition. Note though that you may still receive
2903 * %G_IO_ERROR_WOULD_BLOCK from g_socket_send() even if you were previously
2904 * notified of a %G_IO_OUT condition. (On Windows in particular, this is
2905 * very common due to the way the underlying APIs work.)
2907 * On error -1 is returned and @error is set accordingly.
2909 * Returns: Number of bytes written (which may be less than @size), or -1
2915 g_socket_send_message (GSocket *socket,
2916 GSocketAddress *address,
2917 GOutputVector *vectors,
2919 GSocketControlMessage **messages,
2922 GCancellable *cancellable,
2925 GOutputVector one_vector;
2928 g_return_val_if_fail (G_IS_SOCKET (socket), -1);
2930 if (!check_socket (socket, error))
2933 if (g_cancellable_set_error_if_cancelled (cancellable, error))
2936 if (num_vectors == -1)
2938 for (num_vectors = 0;
2939 vectors[num_vectors].buffer != NULL;
2944 if (num_messages == -1)
2946 for (num_messages = 0;
2947 messages != NULL && messages[num_messages] != NULL;
2952 if (num_vectors == 0)
2956 one_vector.buffer = &zero;
2957 one_vector.size = 1;
2959 vectors = &one_vector;
2972 msg.msg_namelen = g_socket_address_get_native_size (address);
2973 msg.msg_name = g_alloca (msg.msg_namelen);
2974 if (!g_socket_address_to_native (address, msg.msg_name, msg.msg_namelen, error))
2979 msg.msg_name = NULL;
2980 msg.msg_namelen = 0;
2985 /* this entire expression will be evaluated at compile time */
2986 if (sizeof *msg.msg_iov == sizeof *vectors &&
2987 sizeof msg.msg_iov->iov_base == sizeof vectors->buffer &&
2988 G_STRUCT_OFFSET (struct iovec, iov_base) ==
2989 G_STRUCT_OFFSET (GOutputVector, buffer) &&
2990 sizeof msg.msg_iov->iov_len == sizeof vectors->size &&
2991 G_STRUCT_OFFSET (struct iovec, iov_len) ==
2992 G_STRUCT_OFFSET (GOutputVector, size))
2993 /* ABI is compatible */
2995 msg.msg_iov = (struct iovec *) vectors;
2996 msg.msg_iovlen = num_vectors;
2999 /* ABI is incompatible */
3003 msg.msg_iov = g_newa (struct iovec, num_vectors);
3004 for (i = 0; i < num_vectors; i++)
3006 msg.msg_iov[i].iov_base = (void *) vectors[i].buffer;
3007 msg.msg_iov[i].iov_len = vectors[i].size;
3009 msg.msg_iovlen = num_vectors;
3015 struct cmsghdr *cmsg;
3018 msg.msg_controllen = 0;
3019 for (i = 0; i < num_messages; i++)
3020 msg.msg_controllen += CMSG_SPACE (g_socket_control_message_get_size (messages[i]));
3022 if (msg.msg_controllen == 0)
3023 msg.msg_control = NULL;
3026 msg.msg_control = g_alloca (msg.msg_controllen);
3027 memset (msg.msg_control, '\0', msg.msg_controllen);
3030 cmsg = CMSG_FIRSTHDR (&msg);
3031 for (i = 0; i < num_messages; i++)
3033 cmsg->cmsg_level = g_socket_control_message_get_level (messages[i]);
3034 cmsg->cmsg_type = g_socket_control_message_get_msg_type (messages[i]);
3035 cmsg->cmsg_len = CMSG_LEN (g_socket_control_message_get_size (messages[i]));
3036 g_socket_control_message_serialize (messages[i],
3038 cmsg = CMSG_NXTHDR (&msg, cmsg);
3040 g_assert (cmsg == NULL);
3045 if (socket->priv->blocking &&
3046 !g_socket_condition_wait (socket,
3047 G_IO_OUT, cancellable, error))
3050 result = sendmsg (socket->priv->fd, &msg, flags | G_SOCKET_DEFAULT_SEND_FLAGS);
3053 int errsv = get_socket_errno ();
3058 if (socket->priv->blocking &&
3059 (errsv == EWOULDBLOCK ||
3063 g_set_error (error, G_IO_ERROR,
3064 socket_io_error_from_errno (errsv),
3065 _("Error sending message: %s"), socket_strerror (errsv));
3076 struct sockaddr_storage addr;
3083 /* Win32 doesn't support control messages.
3084 Actually this is possible for raw and datagram sockets
3085 via WSASendMessage on Vista or later, but that doesn't
3087 if (num_messages != 0)
3089 g_set_error_literal (error, G_IO_ERROR, G_IO_ERROR_NOT_SUPPORTED,
3090 _("GSocketControlMessage not supported on windows"));
3095 bufs = g_newa (WSABUF, num_vectors);
3096 for (i = 0; i < num_vectors; i++)
3098 bufs[i].buf = (char *)vectors[i].buffer;
3099 bufs[i].len = (gulong)vectors[i].size;
3103 addrlen = 0; /* Avoid warning */
3106 addrlen = g_socket_address_get_native_size (address);
3107 if (!g_socket_address_to_native (address, &addr, sizeof addr, error))
3113 if (socket->priv->blocking &&
3114 !g_socket_condition_wait (socket,
3115 G_IO_OUT, cancellable, error))
3119 result = WSASendTo (socket->priv->fd,
3122 (const struct sockaddr *)&addr, addrlen,
3125 result = WSASend (socket->priv->fd,
3132 int errsv = get_socket_errno ();
3134 if (errsv == WSAEINTR)
3137 if (errsv == WSAEWOULDBLOCK)
3138 win32_unset_event_mask (socket, FD_WRITE);
3140 if (socket->priv->blocking &&
3141 errsv == WSAEWOULDBLOCK)
3144 g_set_error (error, G_IO_ERROR,
3145 socket_io_error_from_errno (errsv),
3146 _("Error sending message: %s"), socket_strerror (errsv));
3159 * g_socket_receive_message:
3160 * @socket: a #GSocket
3161 * @address: a pointer to a #GSocketAddress pointer, or %NULL
3162 * @vectors: (array length=num_vectors): an array of #GInputVector structs
3163 * @num_vectors: the number of elements in @vectors, or -1
3164 * @messages: (array length=num_messages) (allow-none): a pointer which
3165 * may be filled with an array of #GSocketControlMessages, or %NULL
3166 * @num_messages: a pointer which will be filled with the number of
3167 * elements in @messages, or %NULL
3168 * @flags: a pointer to an int containing #GSocketMsgFlags flags
3169 * @cancellable: (allow-none): a %GCancellable or %NULL
3170 * @error: a #GError pointer, or %NULL
3172 * Receive data from a socket. This is the most complicated and
3173 * fully-featured version of this call. For easier use, see
3174 * g_socket_receive() and g_socket_receive_from().
3176 * If @address is non-%NULL then @address will be set equal to the
3177 * source address of the received packet.
3178 * @address is owned by the caller.
3180 * @vector must point to an array of #GInputVector structs and
3181 * @num_vectors must be the length of this array. These structs
3182 * describe the buffers that received data will be scattered into.
3183 * If @num_vectors is -1, then @vectors is assumed to be terminated
3184 * by a #GInputVector with a %NULL buffer pointer.
3186 * As a special case, if @num_vectors is 0 (in which case, @vectors
3187 * may of course be %NULL), then a single byte is received and
3188 * discarded. This is to facilitate the common practice of sending a
3189 * single '\0' byte for the purposes of transferring ancillary data.
3191 * @messages, if non-%NULL, will be set to point to a newly-allocated
3192 * array of #GSocketControlMessage instances or %NULL if no such
3193 * messages was received. These correspond to the control messages
3194 * received from the kernel, one #GSocketControlMessage per message
3195 * from the kernel. This array is %NULL-terminated and must be freed
3196 * by the caller using g_free() after calling g_object_unref() on each
3197 * element. If @messages is %NULL, any control messages received will
3200 * @num_messages, if non-%NULL, will be set to the number of control
3201 * messages received.
3203 * If both @messages and @num_messages are non-%NULL, then
3204 * @num_messages gives the number of #GSocketControlMessage instances
3205 * in @messages (ie: not including the %NULL terminator).
3207 * @flags is an in/out parameter. The commonly available arguments
3208 * for this are available in the #GSocketMsgFlags enum, but the
3209 * values there are the same as the system values, and the flags
3210 * are passed in as-is, so you can pass in system-specific flags too
3211 * (and g_socket_receive_message() may pass system-specific flags out).
3213 * As with g_socket_receive(), data may be discarded if @socket is
3214 * %G_SOCKET_TYPE_DATAGRAM or %G_SOCKET_TYPE_SEQPACKET and you do not
3215 * provide enough buffer space to read a complete message. You can pass
3216 * %G_SOCKET_MSG_PEEK in @flags to peek at the current message without
3217 * removing it from the receive queue, but there is no portable way to find
3218 * out the length of the message other than by reading it into a
3219 * sufficiently-large buffer.
3221 * If the socket is in blocking mode the call will block until there
3222 * is some data to receive, the connection is closed, or there is an
3223 * error. If there is no data available and the socket is in
3224 * non-blocking mode, a %G_IO_ERROR_WOULD_BLOCK error will be
3225 * returned. To be notified when data is available, wait for the
3226 * %G_IO_IN condition.
3228 * On error -1 is returned and @error is set accordingly.
3230 * Returns: Number of bytes read, or 0 if the connection was closed by
3231 * the peer, or -1 on error
3236 g_socket_receive_message (GSocket *socket,
3237 GSocketAddress **address,
3238 GInputVector *vectors,
3240 GSocketControlMessage ***messages,
3243 GCancellable *cancellable,
3246 GInputVector one_vector;
3249 g_return_val_if_fail (G_IS_SOCKET (socket), -1);
3251 if (!check_socket (socket, error))
3254 if (g_cancellable_set_error_if_cancelled (cancellable, error))
3257 if (num_vectors == -1)
3259 for (num_vectors = 0;
3260 vectors[num_vectors].buffer != NULL;
3265 if (num_vectors == 0)
3267 one_vector.buffer = &one_byte;
3268 one_vector.size = 1;
3270 vectors = &one_vector;
3277 struct sockaddr_storage one_sockaddr;
3282 msg.msg_name = &one_sockaddr;
3283 msg.msg_namelen = sizeof (struct sockaddr_storage);
3287 msg.msg_name = NULL;
3288 msg.msg_namelen = 0;
3292 /* this entire expression will be evaluated at compile time */
3293 if (sizeof *msg.msg_iov == sizeof *vectors &&
3294 sizeof msg.msg_iov->iov_base == sizeof vectors->buffer &&
3295 G_STRUCT_OFFSET (struct iovec, iov_base) ==
3296 G_STRUCT_OFFSET (GInputVector, buffer) &&
3297 sizeof msg.msg_iov->iov_len == sizeof vectors->size &&
3298 G_STRUCT_OFFSET (struct iovec, iov_len) ==
3299 G_STRUCT_OFFSET (GInputVector, size))
3300 /* ABI is compatible */
3302 msg.msg_iov = (struct iovec *) vectors;
3303 msg.msg_iovlen = num_vectors;
3306 /* ABI is incompatible */
3310 msg.msg_iov = g_newa (struct iovec, num_vectors);
3311 for (i = 0; i < num_vectors; i++)
3313 msg.msg_iov[i].iov_base = vectors[i].buffer;
3314 msg.msg_iov[i].iov_len = vectors[i].size;
3316 msg.msg_iovlen = num_vectors;
3320 msg.msg_control = g_alloca (2048);
3321 msg.msg_controllen = 2048;
3325 msg.msg_flags = *flags;
3329 /* We always set the close-on-exec flag so we don't leak file
3330 * descriptors into child processes. Note that gunixfdmessage.c
3331 * will later call fcntl (fd, FD_CLOEXEC), but that isn't atomic.
3333 #ifdef MSG_CMSG_CLOEXEC
3334 msg.msg_flags |= MSG_CMSG_CLOEXEC;
3340 if (socket->priv->blocking &&
3341 !g_socket_condition_wait (socket,
3342 G_IO_IN, cancellable, error))
3345 result = recvmsg (socket->priv->fd, &msg, msg.msg_flags);
3346 #ifdef MSG_CMSG_CLOEXEC
3347 if (result < 0 && get_socket_errno () == EINVAL)
3349 /* We must be running on an old kernel. Call without the flag. */
3350 msg.msg_flags &= ~(MSG_CMSG_CLOEXEC);
3351 result = recvmsg (socket->priv->fd, &msg, msg.msg_flags);
3357 int errsv = get_socket_errno ();
3362 if (socket->priv->blocking &&
3363 (errsv == EWOULDBLOCK ||
3367 g_set_error (error, G_IO_ERROR,
3368 socket_io_error_from_errno (errsv),
3369 _("Error receiving message: %s"), socket_strerror (errsv));
3376 /* decode address */
3377 if (address != NULL)
3379 if (msg.msg_namelen > 0)
3380 *address = g_socket_address_new_from_native (msg.msg_name,
3386 /* decode control messages */
3388 GPtrArray *my_messages = NULL;
3389 struct cmsghdr *cmsg;
3391 for (cmsg = CMSG_FIRSTHDR (&msg); cmsg; cmsg = CMSG_NXTHDR (&msg, cmsg))
3393 GSocketControlMessage *message;
3395 message = g_socket_control_message_deserialize (cmsg->cmsg_level,
3397 cmsg->cmsg_len - ((char *)CMSG_DATA (cmsg) - (char *)cmsg),
3399 if (message == NULL)
3400 /* We've already spewed about the problem in the
3401 deserialization code, so just continue */
3404 if (messages == NULL)
3406 /* we have to do it this way if the user ignores the
3407 * messages so that we will close any received fds.
3409 g_object_unref (message);
3413 if (my_messages == NULL)
3414 my_messages = g_ptr_array_new ();
3415 g_ptr_array_add (my_messages, message);
3420 *num_messages = my_messages != NULL ? my_messages->len : 0;
3424 if (my_messages == NULL)
3430 g_ptr_array_add (my_messages, NULL);
3431 *messages = (GSocketControlMessage **) g_ptr_array_free (my_messages, FALSE);
3436 g_assert (my_messages == NULL);
3440 /* capture the flags */
3442 *flags = msg.msg_flags;
3448 struct sockaddr_storage addr;
3450 DWORD bytes_received;
3457 bufs = g_newa (WSABUF, num_vectors);
3458 for (i = 0; i < num_vectors; i++)
3460 bufs[i].buf = (char *)vectors[i].buffer;
3461 bufs[i].len = (gulong)vectors[i].size;
3473 if (socket->priv->blocking &&
3474 !g_socket_condition_wait (socket,
3475 G_IO_IN, cancellable, error))
3478 addrlen = sizeof addr;
3480 result = WSARecvFrom (socket->priv->fd,
3482 &bytes_received, &win_flags,
3483 (struct sockaddr *)&addr, &addrlen,
3486 result = WSARecv (socket->priv->fd,
3488 &bytes_received, &win_flags,
3492 int errsv = get_socket_errno ();
3494 if (errsv == WSAEINTR)
3497 win32_unset_event_mask (socket, FD_READ);
3499 if (socket->priv->blocking &&
3500 errsv == WSAEWOULDBLOCK)
3503 g_set_error (error, G_IO_ERROR,
3504 socket_io_error_from_errno (errsv),
3505 _("Error receiving message: %s"), socket_strerror (errsv));
3509 win32_unset_event_mask (socket, FD_READ);
3513 /* decode address */
3514 if (address != NULL)
3517 *address = g_socket_address_new_from_native (&addr, addrlen);
3522 /* capture the flags */
3526 if (messages != NULL)
3528 if (num_messages != NULL)
3531 return bytes_received;
3537 * g_socket_get_credentials:
3538 * @socket: a #GSocket.
3539 * @error: #GError for error reporting, or %NULL to ignore.
3541 * Returns the credentials of the foreign process connected to this
3542 * socket, if any (e.g. it is only supported for %G_SOCKET_FAMILY_UNIX
3545 * If this operation isn't supported on the OS, the method fails with
3546 * the %G_IO_ERROR_NOT_SUPPORTED error. On Linux this is implemented
3547 * by reading the %SO_PEERCRED option on the underlying socket.
3549 * Other ways to obtain credentials from a foreign peer includes the
3550 * #GUnixCredentialsMessage type and
3551 * g_unix_connection_send_credentials() /
3552 * g_unix_connection_receive_credentials() functions.
3554 * Returns: (transfer full): %NULL if @error is set, otherwise a #GCredentials object
3555 * that must be freed with g_object_unref().
3560 g_socket_get_credentials (GSocket *socket,
3565 g_return_val_if_fail (G_IS_SOCKET (socket), NULL);
3566 g_return_val_if_fail (error == NULL || *error == NULL, NULL);
3570 #if defined(__linux__) || defined(__OpenBSD__)
3573 #if defined(__linux__)
3574 struct ucred native_creds;
3575 optlen = sizeof (struct ucred);
3576 #elif defined(__OpenBSD__)
3577 struct sockpeercred native_creds;
3578 optlen = sizeof (struct sockpeercred);
3580 if (getsockopt (socket->priv->fd,
3583 (void *)&native_creds,
3586 int errsv = get_socket_errno ();
3589 socket_io_error_from_errno (errsv),
3590 _("Unable to get pending error: %s"),
3591 socket_strerror (errsv));
3595 ret = g_credentials_new ();
3596 g_credentials_set_native (ret,
3597 #if defined(__linux__)
3598 G_CREDENTIALS_TYPE_LINUX_UCRED,
3599 #elif defined(__OpenBSD__)
3600 G_CREDENTIALS_TYPE_OPENBSD_SOCKPEERCRED,
3606 g_set_error_literal (error,
3608 G_IO_ERROR_NOT_SUPPORTED,
3609 _("g_socket_get_credentials not implemented for this OS"));