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);
746 /* Make sure winsock has been initialized */
747 g_type_ensure (G_TYPE_INET_ADDRESS);
750 /* There is no portable, thread-safe way to avoid having the process
751 * be killed by SIGPIPE when calling send() or sendmsg(), so we are
752 * forced to simply ignore the signal process-wide.
754 signal (SIGPIPE, SIG_IGN);
757 g_type_class_add_private (klass, sizeof (GSocketPrivate));
759 gobject_class->finalize = g_socket_finalize;
760 gobject_class->constructed = g_socket_constructed;
761 gobject_class->set_property = g_socket_set_property;
762 gobject_class->get_property = g_socket_get_property;
764 g_object_class_install_property (gobject_class, PROP_FAMILY,
765 g_param_spec_enum ("family",
767 P_("The sockets address family"),
768 G_TYPE_SOCKET_FAMILY,
769 G_SOCKET_FAMILY_INVALID,
770 G_PARAM_CONSTRUCT_ONLY |
772 G_PARAM_STATIC_STRINGS));
774 g_object_class_install_property (gobject_class, PROP_TYPE,
775 g_param_spec_enum ("type",
777 P_("The sockets type"),
779 G_SOCKET_TYPE_STREAM,
780 G_PARAM_CONSTRUCT_ONLY |
782 G_PARAM_STATIC_STRINGS));
784 g_object_class_install_property (gobject_class, PROP_PROTOCOL,
785 g_param_spec_enum ("protocol",
786 P_("Socket protocol"),
787 P_("The id of the protocol to use, or -1 for unknown"),
788 G_TYPE_SOCKET_PROTOCOL,
789 G_SOCKET_PROTOCOL_UNKNOWN,
790 G_PARAM_CONSTRUCT_ONLY |
792 G_PARAM_STATIC_STRINGS));
794 g_object_class_install_property (gobject_class, PROP_FD,
795 g_param_spec_int ("fd",
796 P_("File descriptor"),
797 P_("The sockets file descriptor"),
801 G_PARAM_CONSTRUCT_ONLY |
803 G_PARAM_STATIC_STRINGS));
805 g_object_class_install_property (gobject_class, PROP_BLOCKING,
806 g_param_spec_boolean ("blocking",
808 P_("Whether or not I/O on this socket is blocking"),
811 G_PARAM_STATIC_STRINGS));
813 g_object_class_install_property (gobject_class, PROP_LISTEN_BACKLOG,
814 g_param_spec_int ("listen-backlog",
815 P_("Listen backlog"),
816 P_("Outstanding connections in the listen queue"),
821 G_PARAM_STATIC_STRINGS));
823 g_object_class_install_property (gobject_class, PROP_KEEPALIVE,
824 g_param_spec_boolean ("keepalive",
825 P_("Keep connection alive"),
826 P_("Keep connection alive by sending periodic pings"),
829 G_PARAM_STATIC_STRINGS));
831 g_object_class_install_property (gobject_class, PROP_LOCAL_ADDRESS,
832 g_param_spec_object ("local-address",
834 P_("The local address the socket is bound to"),
835 G_TYPE_SOCKET_ADDRESS,
837 G_PARAM_STATIC_STRINGS));
839 g_object_class_install_property (gobject_class, PROP_REMOTE_ADDRESS,
840 g_param_spec_object ("remote-address",
841 P_("Remote address"),
842 P_("The remote address the socket is connected to"),
843 G_TYPE_SOCKET_ADDRESS,
845 G_PARAM_STATIC_STRINGS));
850 * The timeout in seconds on socket I/O
854 g_object_class_install_property (gobject_class, PROP_TIMEOUT,
855 g_param_spec_uint ("timeout",
857 P_("The timeout in seconds on socket I/O"),
862 G_PARAM_STATIC_STRINGS));
867 * Whether the socket should allow sending to and receiving from broadcast addresses.
871 g_object_class_install_property (gobject_class, PROP_BROADCAST,
872 g_param_spec_boolean ("broadcast",
874 P_("Whether to allow sending to and receiving from broadcast addresses"),
877 G_PARAM_STATIC_STRINGS));
882 * Time-to-live for outgoing unicast packets
886 g_object_class_install_property (gobject_class, PROP_TTL,
887 g_param_spec_uint ("ttl",
889 P_("Time-to-live of outgoing unicast packets"),
892 G_PARAM_STATIC_STRINGS));
895 * GSocket:multicast-loopback:
897 * Whether outgoing multicast packets loop back to the local host.
901 g_object_class_install_property (gobject_class, PROP_MULTICAST_LOOPBACK,
902 g_param_spec_boolean ("multicast-loopback",
903 P_("Multicast loopback"),
904 P_("Whether outgoing multicast packets loop back to the local host"),
907 G_PARAM_STATIC_STRINGS));
910 * GSocket:multicast-ttl:
912 * Time-to-live out outgoing multicast packets
916 g_object_class_install_property (gobject_class, PROP_MULTICAST_TTL,
917 g_param_spec_uint ("multicast-ttl",
919 P_("Time-to-live of outgoing multicast packets"),
922 G_PARAM_STATIC_STRINGS));
926 g_socket_initable_iface_init (GInitableIface *iface)
928 iface->init = g_socket_initable_init;
932 g_socket_init (GSocket *socket)
934 socket->priv = G_TYPE_INSTANCE_GET_PRIVATE (socket, G_TYPE_SOCKET, GSocketPrivate);
936 socket->priv->fd = -1;
937 socket->priv->blocking = TRUE;
938 socket->priv->listen_backlog = 10;
939 socket->priv->construct_error = NULL;
941 socket->priv->event = WSA_INVALID_EVENT;
946 g_socket_initable_init (GInitable *initable,
947 GCancellable *cancellable,
952 g_return_val_if_fail (G_IS_SOCKET (initable), FALSE);
954 socket = G_SOCKET (initable);
956 if (cancellable != NULL)
958 g_set_error_literal (error, G_IO_ERROR, G_IO_ERROR_NOT_SUPPORTED,
959 _("Cancellable initialization not supported"));
963 socket->priv->inited = TRUE;
965 if (socket->priv->construct_error)
968 *error = g_error_copy (socket->priv->construct_error);
978 * @family: the socket family to use, e.g. %G_SOCKET_FAMILY_IPV4.
979 * @type: the socket type to use.
980 * @protocol: the id of the protocol to use, or 0 for default.
981 * @error: #GError for error reporting, or %NULL to ignore.
983 * Creates a new #GSocket with the defined family, type and protocol.
984 * If @protocol is 0 (%G_SOCKET_PROTOCOL_DEFAULT) the default protocol type
985 * for the family and type is used.
987 * The @protocol is a family and type specific int that specifies what
988 * kind of protocol to use. #GSocketProtocol lists several common ones.
989 * Many families only support one protocol, and use 0 for this, others
990 * support several and using 0 means to use the default protocol for
991 * the family and type.
993 * The protocol id is passed directly to the operating
994 * system, so you can use protocols not listed in #GSocketProtocol if you
995 * know the protocol number used for it.
997 * Returns: a #GSocket or %NULL on error.
998 * Free the returned object with g_object_unref().
1003 g_socket_new (GSocketFamily family,
1005 GSocketProtocol protocol,
1008 return G_SOCKET (g_initable_new (G_TYPE_SOCKET,
1012 "protocol", protocol,
1017 * g_socket_new_from_fd:
1018 * @fd: a native socket file descriptor.
1019 * @error: #GError for error reporting, or %NULL to ignore.
1021 * Creates a new #GSocket from a native file descriptor
1022 * or winsock SOCKET handle.
1024 * This reads all the settings from the file descriptor so that
1025 * all properties should work. Note that the file descriptor
1026 * will be set to non-blocking mode, independent on the blocking
1027 * mode of the #GSocket.
1029 * Returns: a #GSocket or %NULL on error.
1030 * Free the returned object with g_object_unref().
1035 g_socket_new_from_fd (gint fd,
1038 return G_SOCKET (g_initable_new (G_TYPE_SOCKET,
1045 * g_socket_set_blocking:
1046 * @socket: a #GSocket.
1047 * @blocking: Whether to use blocking I/O or not.
1049 * Sets the blocking mode of the socket. In blocking mode
1050 * all operations block until they succeed or there is an error. In
1051 * non-blocking mode all functions return results immediately or
1052 * with a %G_IO_ERROR_WOULD_BLOCK error.
1054 * All sockets are created in blocking mode. However, note that the
1055 * platform level socket is always non-blocking, and blocking mode
1056 * is a GSocket level feature.
1061 g_socket_set_blocking (GSocket *socket,
1064 g_return_if_fail (G_IS_SOCKET (socket));
1066 blocking = !!blocking;
1068 if (socket->priv->blocking == blocking)
1071 socket->priv->blocking = blocking;
1072 g_object_notify (G_OBJECT (socket), "blocking");
1076 * g_socket_get_blocking:
1077 * @socket: a #GSocket.
1079 * Gets the blocking mode of the socket. For details on blocking I/O,
1080 * see g_socket_set_blocking().
1082 * Returns: %TRUE if blocking I/O is used, %FALSE otherwise.
1087 g_socket_get_blocking (GSocket *socket)
1089 g_return_val_if_fail (G_IS_SOCKET (socket), FALSE);
1091 return socket->priv->blocking;
1095 * g_socket_set_keepalive:
1096 * @socket: a #GSocket.
1097 * @keepalive: Value for the keepalive flag
1099 * Sets or unsets the %SO_KEEPALIVE flag on the underlying socket. When
1100 * this flag is set on a socket, the system will attempt to verify that the
1101 * remote socket endpoint is still present if a sufficiently long period of
1102 * time passes with no data being exchanged. If the system is unable to
1103 * verify the presence of the remote endpoint, it will automatically close
1106 * This option is only functional on certain kinds of sockets. (Notably,
1107 * %G_SOCKET_PROTOCOL_TCP sockets.)
1109 * The exact time between pings is system- and protocol-dependent, but will
1110 * normally be at least two hours. Most commonly, you would set this flag
1111 * on a server socket if you want to allow clients to remain idle for long
1112 * periods of time, but also want to ensure that connections are eventually
1113 * garbage-collected if clients crash or become unreachable.
1118 g_socket_set_keepalive (GSocket *socket,
1123 g_return_if_fail (G_IS_SOCKET (socket));
1125 keepalive = !!keepalive;
1126 if (socket->priv->keepalive == keepalive)
1129 value = (gint) keepalive;
1130 if (setsockopt (socket->priv->fd, SOL_SOCKET, SO_KEEPALIVE,
1131 (gpointer) &value, sizeof (value)) < 0)
1133 int errsv = get_socket_errno ();
1134 g_warning ("error setting keepalive: %s", socket_strerror (errsv));
1138 socket->priv->keepalive = keepalive;
1139 g_object_notify (G_OBJECT (socket), "keepalive");
1143 * g_socket_get_keepalive:
1144 * @socket: a #GSocket.
1146 * Gets the keepalive mode of the socket. For details on this,
1147 * see g_socket_set_keepalive().
1149 * Returns: %TRUE if keepalive is active, %FALSE otherwise.
1154 g_socket_get_keepalive (GSocket *socket)
1156 g_return_val_if_fail (G_IS_SOCKET (socket), FALSE);
1158 return socket->priv->keepalive;
1162 * g_socket_get_listen_backlog:
1163 * @socket: a #GSocket.
1165 * Gets the listen backlog setting of the socket. For details on this,
1166 * see g_socket_set_listen_backlog().
1168 * Returns: the maximum number of pending connections.
1173 g_socket_get_listen_backlog (GSocket *socket)
1175 g_return_val_if_fail (G_IS_SOCKET (socket), 0);
1177 return socket->priv->listen_backlog;
1181 * g_socket_set_listen_backlog:
1182 * @socket: a #GSocket.
1183 * @backlog: the maximum number of pending connections.
1185 * Sets the maximum number of outstanding connections allowed
1186 * when listening on this socket. If more clients than this are
1187 * connecting to the socket and the application is not handling them
1188 * on time then the new connections will be refused.
1190 * Note that this must be called before g_socket_listen() and has no
1191 * effect if called after that.
1196 g_socket_set_listen_backlog (GSocket *socket,
1199 g_return_if_fail (G_IS_SOCKET (socket));
1200 g_return_if_fail (!socket->priv->listening);
1202 if (backlog != socket->priv->listen_backlog)
1204 socket->priv->listen_backlog = backlog;
1205 g_object_notify (G_OBJECT (socket), "listen-backlog");
1210 * g_socket_get_timeout:
1211 * @socket: a #GSocket.
1213 * Gets the timeout setting of the socket. For details on this, see
1214 * g_socket_set_timeout().
1216 * Returns: the timeout in seconds
1221 g_socket_get_timeout (GSocket *socket)
1223 g_return_val_if_fail (G_IS_SOCKET (socket), 0);
1225 return socket->priv->timeout;
1229 * g_socket_set_timeout:
1230 * @socket: a #GSocket.
1231 * @timeout: the timeout for @socket, in seconds, or 0 for none
1233 * Sets the time in seconds after which I/O operations on @socket will
1234 * time out if they have not yet completed.
1236 * On a blocking socket, this means that any blocking #GSocket
1237 * operation will time out after @timeout seconds of inactivity,
1238 * returning %G_IO_ERROR_TIMED_OUT.
1240 * On a non-blocking socket, calls to g_socket_condition_wait() will
1241 * also fail with %G_IO_ERROR_TIMED_OUT after the given time. Sources
1242 * created with g_socket_create_source() will trigger after
1243 * @timeout seconds of inactivity, with the requested condition
1244 * set, at which point calling g_socket_receive(), g_socket_send(),
1245 * g_socket_check_connect_result(), etc, will fail with
1246 * %G_IO_ERROR_TIMED_OUT.
1248 * If @timeout is 0 (the default), operations will never time out
1251 * Note that if an I/O operation is interrupted by a signal, this may
1252 * cause the timeout to be reset.
1257 g_socket_set_timeout (GSocket *socket,
1260 g_return_if_fail (G_IS_SOCKET (socket));
1262 if (timeout != socket->priv->timeout)
1264 socket->priv->timeout = timeout;
1265 g_object_notify (G_OBJECT (socket), "timeout");
1271 * @socket: a #GSocket.
1273 * Gets the unicast time-to-live setting on @socket; see
1274 * g_socket_set_ttl() for more details.
1276 * Returns: the time-to-live setting on @socket
1281 g_socket_get_ttl (GSocket *socket)
1284 guint value, optlen;
1286 g_return_val_if_fail (G_IS_SOCKET (socket), FALSE);
1288 if (socket->priv->family == G_SOCKET_FAMILY_IPV4)
1292 optlen = sizeof (optval);
1293 result = getsockopt (socket->priv->fd, IPPROTO_IP, IP_TTL,
1297 else if (socket->priv->family == G_SOCKET_FAMILY_IPV6)
1299 optlen = sizeof (value);
1300 result = getsockopt (socket->priv->fd, IPPROTO_IPV6, IPV6_UNICAST_HOPS,
1304 g_return_val_if_reached (FALSE);
1308 int errsv = get_socket_errno ();
1309 g_warning ("error getting unicast ttl: %s", socket_strerror (errsv));
1318 * @socket: a #GSocket.
1319 * @ttl: the time-to-live value for all unicast packets on @socket
1321 * Sets the time-to-live for outgoing unicast packets on @socket.
1322 * By default the platform-specific default value is used.
1327 g_socket_set_ttl (GSocket *socket,
1332 g_return_if_fail (G_IS_SOCKET (socket));
1334 if (socket->priv->family == G_SOCKET_FAMILY_IPV4)
1336 guchar optval = (guchar)ttl;
1338 result = setsockopt (socket->priv->fd, IPPROTO_IP, IP_TTL,
1339 &optval, sizeof (optval));
1341 else if (socket->priv->family == G_SOCKET_FAMILY_IPV6)
1343 result = setsockopt (socket->priv->fd, IPPROTO_IPV6, IPV6_UNICAST_HOPS,
1344 &ttl, sizeof (ttl));
1347 g_return_if_reached ();
1351 int errsv = get_socket_errno ();
1352 g_warning ("error setting unicast ttl: %s", socket_strerror (errsv));
1356 g_object_notify (G_OBJECT (socket), "ttl");
1360 * g_socket_get_broadcast:
1361 * @socket: a #GSocket.
1363 * Gets the broadcast setting on @socket; if %TRUE,
1364 * it is possible to send packets to broadcast
1365 * addresses or receive from broadcast addresses.
1367 * Returns: the broadcast setting on @socket
1372 g_socket_get_broadcast (GSocket *socket)
1375 guint value = 0, optlen;
1377 g_return_val_if_fail (G_IS_SOCKET (socket), FALSE);
1379 optlen = sizeof (guchar);
1380 result = getsockopt (socket->priv->fd, SOL_SOCKET, SO_BROADCAST,
1385 int errsv = get_socket_errno ();
1386 g_warning ("error getting broadcast: %s", socket_strerror (errsv));
1394 * g_socket_set_broadcast:
1395 * @socket: a #GSocket.
1396 * @broadcast: whether @socket should allow sending to and receiving
1397 * from broadcast addresses
1399 * Sets whether @socket should allow sending to and receiving from
1400 * broadcast addresses. This is %FALSE by default.
1405 g_socket_set_broadcast (GSocket *socket,
1411 g_return_if_fail (G_IS_SOCKET (socket));
1413 broadcast = !!broadcast;
1414 value = (guchar)broadcast;
1416 result = setsockopt (socket->priv->fd, SOL_SOCKET, SO_BROADCAST,
1417 &value, sizeof (value));
1421 int errsv = get_socket_errno ();
1422 g_warning ("error setting broadcast: %s", socket_strerror (errsv));
1426 g_object_notify (G_OBJECT (socket), "broadcast");
1430 * g_socket_get_multicast_loopback:
1431 * @socket: a #GSocket.
1433 * Gets the multicast loopback setting on @socket; if %TRUE (the
1434 * default), outgoing multicast packets will be looped back to
1435 * multicast listeners on the same host.
1437 * Returns: the multicast loopback setting on @socket
1442 g_socket_get_multicast_loopback (GSocket *socket)
1445 guint value = 0, optlen;
1447 g_return_val_if_fail (G_IS_SOCKET (socket), FALSE);
1449 if (socket->priv->family == G_SOCKET_FAMILY_IPV4)
1451 optlen = sizeof (guchar);
1452 result = getsockopt (socket->priv->fd, IPPROTO_IP, IP_MULTICAST_LOOP,
1455 else if (socket->priv->family == G_SOCKET_FAMILY_IPV6)
1457 optlen = sizeof (guint);
1458 result = getsockopt (socket->priv->fd, IPPROTO_IPV6, IPV6_MULTICAST_LOOP,
1462 g_return_val_if_reached (FALSE);
1466 int errsv = get_socket_errno ();
1467 g_warning ("error getting multicast loopback: %s", socket_strerror (errsv));
1475 * g_socket_set_multicast_loopback:
1476 * @socket: a #GSocket.
1477 * @loopback: whether @socket should receive messages sent to its
1478 * multicast groups from the local host
1480 * Sets whether outgoing multicast packets will be received by sockets
1481 * listening on that multicast address on the same host. This is %TRUE
1487 g_socket_set_multicast_loopback (GSocket *socket,
1492 g_return_if_fail (G_IS_SOCKET (socket));
1494 loopback = !!loopback;
1496 if (socket->priv->family == G_SOCKET_FAMILY_IPV4)
1498 guchar value = (guchar)loopback;
1500 result = setsockopt (socket->priv->fd, IPPROTO_IP, IP_MULTICAST_LOOP,
1501 &value, sizeof (value));
1503 else if (socket->priv->family == G_SOCKET_FAMILY_IPV6)
1505 guint value = (guint)loopback;
1507 result = setsockopt (socket->priv->fd, IPPROTO_IPV6, IPV6_MULTICAST_LOOP,
1508 &value, sizeof (value));
1511 g_return_if_reached ();
1515 int errsv = get_socket_errno ();
1516 g_warning ("error setting multicast loopback: %s", socket_strerror (errsv));
1520 g_object_notify (G_OBJECT (socket), "multicast-loopback");
1524 * g_socket_get_multicast_ttl:
1525 * @socket: a #GSocket.
1527 * Gets the multicast time-to-live setting on @socket; see
1528 * g_socket_set_multicast_ttl() for more details.
1530 * Returns: the multicast time-to-live setting on @socket
1535 g_socket_get_multicast_ttl (GSocket *socket)
1538 guint value, optlen;
1540 g_return_val_if_fail (G_IS_SOCKET (socket), FALSE);
1542 if (socket->priv->family == G_SOCKET_FAMILY_IPV4)
1546 optlen = sizeof (optval);
1547 result = getsockopt (socket->priv->fd, IPPROTO_IP, IP_MULTICAST_TTL,
1551 else if (socket->priv->family == G_SOCKET_FAMILY_IPV6)
1553 optlen = sizeof (value);
1554 result = getsockopt (socket->priv->fd, IPPROTO_IPV6, IPV6_MULTICAST_HOPS,
1558 g_return_val_if_reached (FALSE);
1562 int errsv = get_socket_errno ();
1563 g_warning ("error getting multicast ttl: %s", socket_strerror (errsv));
1571 * g_socket_set_multicast_ttl:
1572 * @socket: a #GSocket.
1573 * @ttl: the time-to-live value for all multicast datagrams on @socket
1575 * Sets the time-to-live for outgoing multicast datagrams on @socket.
1576 * By default, this is 1, meaning that multicast packets will not leave
1577 * the local network.
1582 g_socket_set_multicast_ttl (GSocket *socket,
1587 g_return_if_fail (G_IS_SOCKET (socket));
1589 if (socket->priv->family == G_SOCKET_FAMILY_IPV4)
1591 guchar optval = (guchar)ttl;
1593 result = setsockopt (socket->priv->fd, IPPROTO_IP, IP_MULTICAST_TTL,
1594 &optval, sizeof (optval));
1596 else if (socket->priv->family == G_SOCKET_FAMILY_IPV6)
1598 result = setsockopt (socket->priv->fd, IPPROTO_IPV6, IPV6_MULTICAST_HOPS,
1599 &ttl, sizeof (ttl));
1602 g_return_if_reached ();
1606 int errsv = get_socket_errno ();
1607 g_warning ("error setting multicast ttl: %s", socket_strerror (errsv));
1611 g_object_notify (G_OBJECT (socket), "multicast-ttl");
1615 * g_socket_get_family:
1616 * @socket: a #GSocket.
1618 * Gets the socket family of the socket.
1620 * Returns: a #GSocketFamily
1625 g_socket_get_family (GSocket *socket)
1627 g_return_val_if_fail (G_IS_SOCKET (socket), G_SOCKET_FAMILY_INVALID);
1629 return socket->priv->family;
1633 * g_socket_get_socket_type:
1634 * @socket: a #GSocket.
1636 * Gets the socket type of the socket.
1638 * Returns: a #GSocketType
1643 g_socket_get_socket_type (GSocket *socket)
1645 g_return_val_if_fail (G_IS_SOCKET (socket), G_SOCKET_TYPE_INVALID);
1647 return socket->priv->type;
1651 * g_socket_get_protocol:
1652 * @socket: a #GSocket.
1654 * Gets the socket protocol id the socket was created with.
1655 * In case the protocol is unknown, -1 is returned.
1657 * Returns: a protocol id, or -1 if unknown
1662 g_socket_get_protocol (GSocket *socket)
1664 g_return_val_if_fail (G_IS_SOCKET (socket), -1);
1666 return socket->priv->protocol;
1671 * @socket: a #GSocket.
1673 * Returns the underlying OS socket object. On unix this
1674 * is a socket file descriptor, and on windows this is
1675 * a Winsock2 SOCKET handle. This may be useful for
1676 * doing platform specific or otherwise unusual operations
1679 * Returns: the file descriptor of the socket.
1684 g_socket_get_fd (GSocket *socket)
1686 g_return_val_if_fail (G_IS_SOCKET (socket), -1);
1688 return socket->priv->fd;
1692 * g_socket_get_local_address:
1693 * @socket: a #GSocket.
1694 * @error: #GError for error reporting, or %NULL to ignore.
1696 * Try to get the local address of a bound socket. This is only
1697 * useful if the socket has been bound to a local address,
1698 * either explicitly or implicitly when connecting.
1700 * Returns: (transfer full): a #GSocketAddress or %NULL on error.
1701 * Free the returned object with g_object_unref().
1706 g_socket_get_local_address (GSocket *socket,
1709 struct sockaddr_storage buffer;
1710 guint32 len = sizeof (buffer);
1712 g_return_val_if_fail (G_IS_SOCKET (socket), NULL);
1714 if (getsockname (socket->priv->fd, (struct sockaddr *) &buffer, &len) < 0)
1716 int errsv = get_socket_errno ();
1717 g_set_error (error, G_IO_ERROR, socket_io_error_from_errno (errsv),
1718 _("could not get local address: %s"), socket_strerror (errsv));
1722 return g_socket_address_new_from_native (&buffer, len);
1726 * g_socket_get_remote_address:
1727 * @socket: a #GSocket.
1728 * @error: #GError for error reporting, or %NULL to ignore.
1730 * Try to get the remove address of a connected socket. This is only
1731 * useful for connection oriented sockets that have been connected.
1733 * Returns: (transfer full): a #GSocketAddress or %NULL on error.
1734 * Free the returned object with g_object_unref().
1739 g_socket_get_remote_address (GSocket *socket,
1742 struct sockaddr_storage buffer;
1743 guint32 len = sizeof (buffer);
1745 g_return_val_if_fail (G_IS_SOCKET (socket), NULL);
1747 if (socket->priv->connect_pending)
1749 if (!g_socket_check_connect_result (socket, error))
1752 socket->priv->connect_pending = FALSE;
1755 if (!socket->priv->remote_address)
1757 if (getpeername (socket->priv->fd, (struct sockaddr *) &buffer, &len) < 0)
1759 int errsv = get_socket_errno ();
1760 g_set_error (error, G_IO_ERROR, socket_io_error_from_errno (errsv),
1761 _("could not get remote address: %s"), socket_strerror (errsv));
1765 socket->priv->remote_address = g_socket_address_new_from_native (&buffer, len);
1768 return g_object_ref (socket->priv->remote_address);
1772 * g_socket_is_connected:
1773 * @socket: a #GSocket.
1775 * Check whether the socket is connected. This is only useful for
1776 * connection-oriented sockets.
1778 * Returns: %TRUE if socket is connected, %FALSE otherwise.
1783 g_socket_is_connected (GSocket *socket)
1785 g_return_val_if_fail (G_IS_SOCKET (socket), FALSE);
1787 return socket->priv->connected;
1792 * @socket: a #GSocket.
1793 * @error: #GError for error reporting, or %NULL to ignore.
1795 * Marks the socket as a server socket, i.e. a socket that is used
1796 * to accept incoming requests using g_socket_accept().
1798 * Before calling this the socket must be bound to a local address using
1801 * To set the maximum amount of outstanding clients, use
1802 * g_socket_set_listen_backlog().
1804 * Returns: %TRUE on success, %FALSE on error.
1809 g_socket_listen (GSocket *socket,
1812 g_return_val_if_fail (G_IS_SOCKET (socket), FALSE);
1814 if (!check_socket (socket, error))
1817 if (listen (socket->priv->fd, socket->priv->listen_backlog) < 0)
1819 int errsv = get_socket_errno ();
1821 g_set_error (error, G_IO_ERROR, socket_io_error_from_errno (errsv),
1822 _("could not listen: %s"), socket_strerror (errsv));
1826 socket->priv->listening = TRUE;
1833 * @socket: a #GSocket.
1834 * @address: a #GSocketAddress specifying the local address.
1835 * @allow_reuse: whether to allow reusing this address
1836 * @error: #GError for error reporting, or %NULL to ignore.
1838 * When a socket is created it is attached to an address family, but it
1839 * doesn't have an address in this family. g_socket_bind() assigns the
1840 * address (sometimes called name) of the socket.
1842 * It is generally required to bind to a local address before you can
1843 * receive connections. (See g_socket_listen() and g_socket_accept() ).
1844 * In certain situations, you may also want to bind a socket that will be
1845 * used to initiate connections, though this is not normally required.
1847 * @allow_reuse should be %TRUE for server sockets (sockets that you will
1848 * eventually call g_socket_accept() on), and %FALSE for client sockets.
1849 * (Specifically, if it is %TRUE, then g_socket_bind() will set the
1850 * %SO_REUSEADDR flag on the socket, allowing it to bind @address even if
1851 * that address was previously used by another socket that has not yet been
1852 * fully cleaned-up by the kernel. Failing to set this flag on a server
1853 * socket may cause the bind call to return %G_IO_ERROR_ADDRESS_IN_USE if
1854 * the server program is stopped and then immediately restarted.)
1856 * Returns: %TRUE on success, %FALSE on error.
1861 g_socket_bind (GSocket *socket,
1862 GSocketAddress *address,
1863 gboolean reuse_address,
1866 struct sockaddr_storage addr;
1868 g_return_val_if_fail (G_IS_SOCKET (socket) && G_IS_SOCKET_ADDRESS (address), FALSE);
1870 if (!check_socket (socket, error))
1873 /* SO_REUSEADDR on windows means something else and is not what we want.
1874 It always allows the unix variant of SO_REUSEADDR anyway */
1879 value = (int) !!reuse_address;
1880 /* Ignore errors here, the only likely error is "not supported", and
1881 this is a "best effort" thing mainly */
1882 setsockopt (socket->priv->fd, SOL_SOCKET, SO_REUSEADDR,
1883 (gpointer) &value, sizeof (value));
1887 if (!g_socket_address_to_native (address, &addr, sizeof addr, error))
1890 if (bind (socket->priv->fd, (struct sockaddr *) &addr,
1891 g_socket_address_get_native_size (address)) < 0)
1893 int errsv = get_socket_errno ();
1895 G_IO_ERROR, socket_io_error_from_errno (errsv),
1896 _("Error binding to address: %s"), socket_strerror (errsv));
1904 g_socket_multicast_group_operation (GSocket *socket,
1905 GInetAddress *group,
1906 gboolean source_specific,
1908 gboolean join_group,
1911 const guint8 *native_addr;
1912 gint optname, result;
1914 g_return_val_if_fail (G_IS_SOCKET (socket), FALSE);
1915 g_return_val_if_fail (socket->priv->type == G_SOCKET_TYPE_DATAGRAM, FALSE);
1916 g_return_val_if_fail (G_IS_INET_ADDRESS (group), FALSE);
1917 g_return_val_if_fail (g_inet_address_get_family (group) == socket->priv->family, FALSE);
1919 if (!check_socket (socket, error))
1922 native_addr = g_inet_address_to_bytes (group);
1923 if (socket->priv->family == G_SOCKET_FAMILY_IPV4)
1925 #ifdef HAVE_IP_MREQN
1926 struct ip_mreqn mc_req;
1928 struct ip_mreq mc_req;
1931 memcpy (&mc_req.imr_multiaddr, native_addr, sizeof (struct in_addr));
1933 #ifdef HAVE_IP_MREQN
1935 mc_req.imr_ifindex = if_nametoindex (iface);
1937 mc_req.imr_ifindex = 0; /* Pick any. */
1939 mc_req.imr_interface.s_addr = g_htonl (INADDR_ANY);
1942 if (source_specific)
1944 #ifdef IP_ADD_SOURCE_MEMBERSHIP
1945 optname = join_group ? IP_ADD_SOURCE_MEMBERSHIP : IP_DROP_SOURCE_MEMBERSHIP;
1947 g_set_error (error, G_IO_ERROR, G_IO_ERROR_NOT_SUPPORTED,
1949 _("Error joining multicast group: %s") :
1950 _("Error leaving multicast group: %s"),
1951 _("No support for source-specific multicast"));
1956 optname = join_group ? IP_ADD_MEMBERSHIP : IP_DROP_MEMBERSHIP;
1957 result = setsockopt (socket->priv->fd, IPPROTO_IP, optname,
1958 &mc_req, sizeof (mc_req));
1960 else if (socket->priv->family == G_SOCKET_FAMILY_IPV6)
1962 struct ipv6_mreq mc_req_ipv6;
1964 memcpy (&mc_req_ipv6.ipv6mr_multiaddr, native_addr, sizeof (struct in6_addr));
1965 #ifdef HAVE_IF_NAMETOINDEX
1967 mc_req_ipv6.ipv6mr_interface = if_nametoindex (iface);
1970 mc_req_ipv6.ipv6mr_interface = 0;
1972 optname = join_group ? IPV6_JOIN_GROUP : IPV6_LEAVE_GROUP;
1973 result = setsockopt (socket->priv->fd, IPPROTO_IPV6, optname,
1974 &mc_req_ipv6, sizeof (mc_req_ipv6));
1977 g_return_val_if_reached (FALSE);
1981 int errsv = get_socket_errno ();
1983 g_set_error (error, G_IO_ERROR, socket_io_error_from_errno (errsv),
1985 _("Error joining multicast group: %s") :
1986 _("Error leaving multicast group: %s"),
1987 socket_strerror (errsv));
1995 * g_socket_join_multicast_group:
1996 * @socket: a #GSocket.
1997 * @group: a #GInetAddress specifying the group address to join.
1998 * @iface: (allow-none): Name of the interface to use, or %NULL
1999 * @source_specific: %TRUE if source-specific multicast should be used
2000 * @error: #GError for error reporting, or %NULL to ignore.
2002 * Registers @socket to receive multicast messages sent to @group.
2003 * @socket must be a %G_SOCKET_TYPE_DATAGRAM socket, and must have
2004 * been bound to an appropriate interface and port with
2007 * If @iface is %NULL, the system will automatically pick an interface
2008 * to bind to based on @group.
2010 * If @source_specific is %TRUE, source-specific multicast as defined
2011 * in RFC 4604 is used. Note that on older platforms this may fail
2012 * with a %G_IO_ERROR_NOT_SUPPORTED error.
2014 * Returns: %TRUE on success, %FALSE on error.
2019 g_socket_join_multicast_group (GSocket *socket,
2020 GInetAddress *group,
2021 gboolean source_specific,
2025 return g_socket_multicast_group_operation (socket, group, source_specific, iface, TRUE, error);
2029 * g_socket_leave_multicast_group:
2030 * @socket: a #GSocket.
2031 * @group: a #GInetAddress specifying the group address to leave.
2032 * @iface: (allow-none): Interface used
2033 * @source_specific: %TRUE if source-specific multicast was used
2034 * @error: #GError for error reporting, or %NULL to ignore.
2036 * Removes @socket from the multicast group defined by @group, @iface,
2037 * and @source_specific (which must all have the same values they had
2038 * when you joined the group).
2040 * @socket remains bound to its address and port, and can still receive
2041 * unicast messages after calling this.
2043 * Returns: %TRUE on success, %FALSE on error.
2048 g_socket_leave_multicast_group (GSocket *socket,
2049 GInetAddress *group,
2050 gboolean source_specific,
2054 return g_socket_multicast_group_operation (socket, group, source_specific, iface, FALSE, error);
2058 * g_socket_speaks_ipv4:
2059 * @socket: a #GSocket
2061 * Checks if a socket is capable of speaking IPv4.
2063 * IPv4 sockets are capable of speaking IPv4. On some operating systems
2064 * and under some combinations of circumstances IPv6 sockets are also
2065 * capable of speaking IPv4. See RFC 3493 section 3.7 for more
2068 * No other types of sockets are currently considered as being capable
2071 * Returns: %TRUE if this socket can be used with IPv4.
2076 g_socket_speaks_ipv4 (GSocket *socket)
2078 switch (socket->priv->family)
2080 case G_SOCKET_FAMILY_IPV4:
2083 case G_SOCKET_FAMILY_IPV6:
2084 #if defined (IPPROTO_IPV6) && defined (IPV6_V6ONLY)
2086 guint sizeof_int = sizeof (int);
2089 if (getsockopt (socket->priv->fd,
2090 IPPROTO_IPV6, IPV6_V6ONLY,
2091 &v6_only, &sizeof_int) != 0)
2107 * @socket: a #GSocket.
2108 * @cancellable: (allow-none): a %GCancellable or %NULL
2109 * @error: #GError for error reporting, or %NULL to ignore.
2111 * Accept incoming connections on a connection-based socket. This removes
2112 * the first outstanding connection request from the listening socket and
2113 * creates a #GSocket object for it.
2115 * The @socket must be bound to a local address with g_socket_bind() and
2116 * must be listening for incoming connections (g_socket_listen()).
2118 * If there are no outstanding connections then the operation will block
2119 * or return %G_IO_ERROR_WOULD_BLOCK if non-blocking I/O is enabled.
2120 * To be notified of an incoming connection, wait for the %G_IO_IN condition.
2122 * Returns: (transfer full): a new #GSocket, or %NULL on error.
2123 * Free the returned object with g_object_unref().
2128 g_socket_accept (GSocket *socket,
2129 GCancellable *cancellable,
2132 GSocket *new_socket;
2135 g_return_val_if_fail (G_IS_SOCKET (socket), NULL);
2137 if (!check_socket (socket, error))
2142 if (socket->priv->blocking &&
2143 !g_socket_condition_wait (socket,
2144 G_IO_IN, cancellable, error))
2147 if ((ret = accept (socket->priv->fd, NULL, 0)) < 0)
2149 int errsv = get_socket_errno ();
2151 win32_unset_event_mask (socket, FD_ACCEPT);
2156 if (socket->priv->blocking)
2158 #ifdef WSAEWOULDBLOCK
2159 if (errsv == WSAEWOULDBLOCK)
2162 if (errsv == EWOULDBLOCK ||
2168 g_set_error (error, G_IO_ERROR,
2169 socket_io_error_from_errno (errsv),
2170 _("Error accepting connection: %s"), socket_strerror (errsv));
2176 win32_unset_event_mask (socket, FD_ACCEPT);
2180 /* The socket inherits the accepting sockets event mask and even object,
2181 we need to remove that */
2182 WSAEventSelect (ret, NULL, 0);
2188 /* We always want to set close-on-exec to protect users. If you
2189 need to so some weird inheritance to exec you can re-enable this
2190 using lower level hacks with g_socket_get_fd(). */
2191 flags = fcntl (ret, F_GETFD, 0);
2193 (flags & FD_CLOEXEC) == 0)
2195 flags |= FD_CLOEXEC;
2196 fcntl (ret, F_SETFD, flags);
2201 new_socket = g_socket_new_from_fd (ret, error);
2202 if (new_socket == NULL)
2211 new_socket->priv->protocol = socket->priv->protocol;
2218 * @socket: a #GSocket.
2219 * @address: a #GSocketAddress specifying the remote address.
2220 * @cancellable: (allow-none): a %GCancellable or %NULL
2221 * @error: #GError for error reporting, or %NULL to ignore.
2223 * Connect the socket to the specified remote address.
2225 * For connection oriented socket this generally means we attempt to make
2226 * a connection to the @address. For a connection-less socket it sets
2227 * the default address for g_socket_send() and discards all incoming datagrams
2228 * from other sources.
2230 * Generally connection oriented sockets can only connect once, but
2231 * connection-less sockets can connect multiple times to change the
2234 * If the connect call needs to do network I/O it will block, unless
2235 * non-blocking I/O is enabled. Then %G_IO_ERROR_PENDING is returned
2236 * and the user can be notified of the connection finishing by waiting
2237 * for the G_IO_OUT condition. The result of the connection must then be
2238 * checked with g_socket_check_connect_result().
2240 * Returns: %TRUE if connected, %FALSE on error.
2245 g_socket_connect (GSocket *socket,
2246 GSocketAddress *address,
2247 GCancellable *cancellable,
2250 struct sockaddr_storage buffer;
2252 g_return_val_if_fail (G_IS_SOCKET (socket) && G_IS_SOCKET_ADDRESS (address), FALSE);
2254 if (!check_socket (socket, error))
2257 if (!g_socket_address_to_native (address, &buffer, sizeof buffer, error))
2260 if (socket->priv->remote_address)
2261 g_object_unref (socket->priv->remote_address);
2262 socket->priv->remote_address = g_object_ref (address);
2266 if (connect (socket->priv->fd, (struct sockaddr *) &buffer,
2267 g_socket_address_get_native_size (address)) < 0)
2269 int errsv = get_socket_errno ();
2275 if (errsv == EINPROGRESS)
2277 if (errsv == WSAEWOULDBLOCK)
2280 if (socket->priv->blocking)
2282 if (g_socket_condition_wait (socket, G_IO_OUT, cancellable, error))
2284 if (g_socket_check_connect_result (socket, error))
2290 g_set_error_literal (error, G_IO_ERROR, G_IO_ERROR_PENDING,
2291 _("Connection in progress"));
2292 socket->priv->connect_pending = TRUE;
2296 g_set_error_literal (error, G_IO_ERROR,
2297 socket_io_error_from_errno (errsv),
2298 socket_strerror (errsv));
2305 win32_unset_event_mask (socket, FD_CONNECT);
2307 socket->priv->connected = TRUE;
2313 * g_socket_check_connect_result:
2314 * @socket: a #GSocket
2315 * @error: #GError for error reporting, or %NULL to ignore.
2317 * Checks and resets the pending connect error for the socket.
2318 * This is used to check for errors when g_socket_connect() is
2319 * used in non-blocking mode.
2321 * Returns: %TRUE if no error, %FALSE otherwise, setting @error to the error
2326 g_socket_check_connect_result (GSocket *socket,
2332 g_return_val_if_fail (G_IS_SOCKET (socket), FALSE);
2334 if (!check_socket (socket, error))
2337 optlen = sizeof (value);
2338 if (getsockopt (socket->priv->fd, SOL_SOCKET, SO_ERROR, (void *)&value, &optlen) != 0)
2340 int errsv = get_socket_errno ();
2342 g_set_error (error, G_IO_ERROR, socket_io_error_from_errno (errsv),
2343 _("Unable to get pending error: %s"), socket_strerror (errsv));
2349 g_set_error_literal (error, G_IO_ERROR, socket_io_error_from_errno (value),
2350 socket_strerror (value));
2351 if (socket->priv->remote_address)
2353 g_object_unref (socket->priv->remote_address);
2354 socket->priv->remote_address = NULL;
2359 socket->priv->connected = TRUE;
2364 * g_socket_get_available_bytes:
2365 * @socket: a #GSocket
2367 * Get the amount of data pending in the OS input buffer.
2369 * Returns: the number of bytes that can be read from the socket
2370 * without blocking or -1 on error.
2375 g_socket_get_available_bytes (GSocket *socket)
2383 g_return_val_if_fail (G_IS_SOCKET (socket), -1);
2386 if (ioctl (socket->priv->fd, FIONREAD, &avail) < 0)
2389 if (ioctlsocket (socket->priv->fd, FIONREAD, &avail) == SOCKET_ERROR)
2398 * @socket: a #GSocket
2399 * @buffer: a buffer to read data into (which should be at least @size
2401 * @size: the number of bytes you want to read from the socket
2402 * @cancellable: (allow-none): a %GCancellable or %NULL
2403 * @error: #GError for error reporting, or %NULL to ignore.
2405 * Receive data (up to @size bytes) from a socket. This is mainly used by
2406 * connection-oriented sockets; it is identical to g_socket_receive_from()
2407 * with @address set to %NULL.
2409 * For %G_SOCKET_TYPE_DATAGRAM and %G_SOCKET_TYPE_SEQPACKET sockets,
2410 * g_socket_receive() will always read either 0 or 1 complete messages from
2411 * the socket. If the received message is too large to fit in @buffer, then
2412 * the data beyond @size bytes will be discarded, without any explicit
2413 * indication that this has occurred.
2415 * For %G_SOCKET_TYPE_STREAM sockets, g_socket_receive() can return any
2416 * number of bytes, up to @size. If more than @size bytes have been
2417 * received, the additional data will be returned in future calls to
2418 * g_socket_receive().
2420 * If the socket is in blocking mode the call will block until there
2421 * is some data to receive, the connection is closed, or there is an
2422 * error. If there is no data available and the socket is in
2423 * non-blocking mode, a %G_IO_ERROR_WOULD_BLOCK error will be
2424 * returned. To be notified when data is available, wait for the
2425 * %G_IO_IN condition.
2427 * On error -1 is returned and @error is set accordingly.
2429 * Returns: Number of bytes read, or 0 if the connection was closed by
2430 * the peer, or -1 on error
2435 g_socket_receive (GSocket *socket,
2438 GCancellable *cancellable,
2441 return g_socket_receive_with_blocking (socket, buffer, size,
2442 socket->priv->blocking,
2443 cancellable, error);
2447 * g_socket_receive_with_blocking:
2448 * @socket: a #GSocket
2449 * @buffer: a buffer to read data into (which should be at least @size
2451 * @size: the number of bytes you want to read from the socket
2452 * @blocking: whether to do blocking or non-blocking I/O
2453 * @cancellable: (allow-none): a %GCancellable or %NULL
2454 * @error: #GError for error reporting, or %NULL to ignore.
2456 * This behaves exactly the same as g_socket_receive(), except that
2457 * the choice of blocking or non-blocking behavior is determined by
2458 * the @blocking argument rather than by @socket's properties.
2460 * Returns: Number of bytes read, or 0 if the connection was closed by
2461 * the peer, or -1 on error
2466 g_socket_receive_with_blocking (GSocket *socket,
2470 GCancellable *cancellable,
2475 g_return_val_if_fail (G_IS_SOCKET (socket) && buffer != NULL, -1);
2477 if (!check_socket (socket, error))
2480 if (g_cancellable_set_error_if_cancelled (cancellable, error))
2486 !g_socket_condition_wait (socket,
2487 G_IO_IN, cancellable, error))
2490 if ((ret = recv (socket->priv->fd, buffer, size, 0)) < 0)
2492 int errsv = get_socket_errno ();
2499 #ifdef WSAEWOULDBLOCK
2500 if (errsv == WSAEWOULDBLOCK)
2503 if (errsv == EWOULDBLOCK ||
2509 win32_unset_event_mask (socket, FD_READ);
2511 g_set_error (error, G_IO_ERROR,
2512 socket_io_error_from_errno (errsv),
2513 _("Error receiving data: %s"), socket_strerror (errsv));
2517 win32_unset_event_mask (socket, FD_READ);
2526 * g_socket_receive_from:
2527 * @socket: a #GSocket
2528 * @address: (out) (allow-none): a pointer to a #GSocketAddress
2530 * @buffer: (array length=size) (element-type guint8): a buffer to
2531 * read data into (which should be at least @size bytes long).
2532 * @size: the number of bytes you want to read from the socket
2533 * @cancellable: (allow-none): a %GCancellable or %NULL
2534 * @error: #GError for error reporting, or %NULL to ignore.
2536 * Receive data (up to @size bytes) from a socket.
2538 * If @address is non-%NULL then @address will be set equal to the
2539 * source address of the received packet.
2540 * @address is owned by the caller.
2542 * See g_socket_receive() for additional information.
2544 * Returns: Number of bytes read, or 0 if the connection was closed by
2545 * the peer, or -1 on error
2550 g_socket_receive_from (GSocket *socket,
2551 GSocketAddress **address,
2554 GCancellable *cancellable,
2562 return g_socket_receive_message (socket,
2570 /* Although we ignore SIGPIPE, gdb will still stop if the app receives
2571 * one, which can be confusing and annoying. So if possible, we want
2572 * to suppress the signal entirely.
2575 #define G_SOCKET_DEFAULT_SEND_FLAGS MSG_NOSIGNAL
2577 #define G_SOCKET_DEFAULT_SEND_FLAGS 0
2582 * @socket: a #GSocket
2583 * @buffer: (array length=size) (element-type guint8): the buffer
2584 * containing the data to send.
2585 * @size: the number of bytes to send
2586 * @cancellable: (allow-none): a %GCancellable or %NULL
2587 * @error: #GError for error reporting, or %NULL to ignore.
2589 * Tries to send @size bytes from @buffer on the socket. This is
2590 * mainly used by connection-oriented sockets; it is identical to
2591 * g_socket_send_to() with @address set to %NULL.
2593 * If the socket is in blocking mode the call will block until there is
2594 * space for the data in the socket queue. If there is no space available
2595 * and the socket is in non-blocking mode a %G_IO_ERROR_WOULD_BLOCK error
2596 * will be returned. To be notified when space is available, wait for the
2597 * %G_IO_OUT condition. Note though that you may still receive
2598 * %G_IO_ERROR_WOULD_BLOCK from g_socket_send() even if you were previously
2599 * notified of a %G_IO_OUT condition. (On Windows in particular, this is
2600 * very common due to the way the underlying APIs work.)
2602 * On error -1 is returned and @error is set accordingly.
2604 * Returns: Number of bytes written (which may be less than @size), or -1
2610 g_socket_send (GSocket *socket,
2611 const gchar *buffer,
2613 GCancellable *cancellable,
2616 return g_socket_send_with_blocking (socket, buffer, size,
2617 socket->priv->blocking,
2618 cancellable, error);
2622 * g_socket_send_with_blocking:
2623 * @socket: a #GSocket
2624 * @buffer: (array length=size) (element-type guint8): the buffer
2625 * containing the data to send.
2626 * @size: the number of bytes to send
2627 * @blocking: whether to do blocking or non-blocking I/O
2628 * @cancellable: (allow-none): a %GCancellable or %NULL
2629 * @error: #GError for error reporting, or %NULL to ignore.
2631 * This behaves exactly the same as g_socket_send(), except that
2632 * the choice of blocking or non-blocking behavior is determined by
2633 * the @blocking argument rather than by @socket's properties.
2635 * Returns: Number of bytes written (which may be less than @size), or -1
2641 g_socket_send_with_blocking (GSocket *socket,
2642 const gchar *buffer,
2645 GCancellable *cancellable,
2650 g_return_val_if_fail (G_IS_SOCKET (socket) && buffer != NULL, -1);
2652 if (!check_socket (socket, error))
2655 if (g_cancellable_set_error_if_cancelled (cancellable, error))
2661 !g_socket_condition_wait (socket,
2662 G_IO_OUT, cancellable, error))
2665 if ((ret = send (socket->priv->fd, buffer, size, G_SOCKET_DEFAULT_SEND_FLAGS)) < 0)
2667 int errsv = get_socket_errno ();
2672 #ifdef WSAEWOULDBLOCK
2673 if (errsv == WSAEWOULDBLOCK)
2674 win32_unset_event_mask (socket, FD_WRITE);
2679 #ifdef WSAEWOULDBLOCK
2680 if (errsv == WSAEWOULDBLOCK)
2683 if (errsv == EWOULDBLOCK ||
2689 g_set_error (error, G_IO_ERROR,
2690 socket_io_error_from_errno (errsv),
2691 _("Error sending data: %s"), socket_strerror (errsv));
2702 * @socket: a #GSocket
2703 * @address: (allow-none): a #GSocketAddress, or %NULL
2704 * @buffer: (array length=size) (element-type guint8): the buffer
2705 * containing the data to send.
2706 * @size: the number of bytes to send
2707 * @cancellable: (allow-none): a %GCancellable or %NULL
2708 * @error: #GError for error reporting, or %NULL to ignore.
2710 * Tries to send @size bytes from @buffer to @address. If @address is
2711 * %NULL then the message is sent to the default receiver (set by
2712 * g_socket_connect()).
2714 * See g_socket_send() for additional information.
2716 * Returns: Number of bytes written (which may be less than @size), or -1
2722 g_socket_send_to (GSocket *socket,
2723 GSocketAddress *address,
2724 const gchar *buffer,
2726 GCancellable *cancellable,
2734 return g_socket_send_message (socket,
2744 * g_socket_shutdown:
2745 * @socket: a #GSocket
2746 * @shutdown_read: whether to shut down the read side
2747 * @shutdown_write: whether to shut down the write side
2748 * @error: #GError for error reporting, or %NULL to ignore.
2750 * Shut down part of a full-duplex connection.
2752 * If @shutdown_read is %TRUE then the receiving side of the connection
2753 * is shut down, and further reading is disallowed.
2755 * If @shutdown_write is %TRUE then the sending side of the connection
2756 * is shut down, and further writing is disallowed.
2758 * It is allowed for both @shutdown_read and @shutdown_write to be %TRUE.
2760 * One example where this is used is graceful disconnect for TCP connections
2761 * where you close the sending side, then wait for the other side to close
2762 * the connection, thus ensuring that the other side saw all sent data.
2764 * Returns: %TRUE on success, %FALSE on error
2769 g_socket_shutdown (GSocket *socket,
2770 gboolean shutdown_read,
2771 gboolean shutdown_write,
2776 g_return_val_if_fail (G_IS_SOCKET (socket), TRUE);
2778 if (!check_socket (socket, error))
2782 if (!shutdown_read && !shutdown_write)
2786 if (shutdown_read && shutdown_write)
2788 else if (shutdown_read)
2793 if (shutdown_read && shutdown_write)
2795 else if (shutdown_read)
2801 if (shutdown (socket->priv->fd, how) != 0)
2803 int errsv = get_socket_errno ();
2804 g_set_error (error, G_IO_ERROR, socket_io_error_from_errno (errsv),
2805 _("Unable to shutdown socket: %s"), socket_strerror (errsv));
2809 if (shutdown_read && shutdown_write)
2810 socket->priv->connected = FALSE;
2817 * @socket: a #GSocket
2818 * @error: #GError for error reporting, or %NULL to ignore.
2820 * Closes the socket, shutting down any active connection.
2822 * Closing a socket does not wait for all outstanding I/O operations
2823 * to finish, so the caller should not rely on them to be guaranteed
2824 * to complete even if the close returns with no error.
2826 * Once the socket is closed, all other operations will return
2827 * %G_IO_ERROR_CLOSED. Closing a socket multiple times will not
2830 * Sockets will be automatically closed when the last reference
2831 * is dropped, but you might want to call this function to make sure
2832 * resources are released as early as possible.
2834 * Beware that due to the way that TCP works, it is possible for
2835 * recently-sent data to be lost if either you close a socket while the
2836 * %G_IO_IN condition is set, or else if the remote connection tries to
2837 * send something to you after you close the socket but before it has
2838 * finished reading all of the data you sent. There is no easy generic
2839 * way to avoid this problem; the easiest fix is to design the network
2840 * protocol such that the client will never send data "out of turn".
2841 * Another solution is for the server to half-close the connection by
2842 * calling g_socket_shutdown() with only the @shutdown_write flag set,
2843 * and then wait for the client to notice this and close its side of the
2844 * connection, after which the server can safely call g_socket_close().
2845 * (This is what #GTcpConnection does if you call
2846 * g_tcp_connection_set_graceful_disconnect(). But of course, this
2847 * only works if the client will close its connection after the server
2850 * Returns: %TRUE on success, %FALSE on error
2855 g_socket_close (GSocket *socket,
2860 g_return_val_if_fail (G_IS_SOCKET (socket), TRUE);
2862 if (socket->priv->closed)
2863 return TRUE; /* Multiple close not an error */
2865 if (!check_socket (socket, error))
2871 res = closesocket (socket->priv->fd);
2873 res = close (socket->priv->fd);
2877 int errsv = get_socket_errno ();
2882 g_set_error (error, G_IO_ERROR,
2883 socket_io_error_from_errno (errsv),
2884 _("Error closing socket: %s"),
2885 socket_strerror (errsv));
2891 socket->priv->connected = FALSE;
2892 socket->priv->closed = TRUE;
2893 if (socket->priv->remote_address)
2895 g_object_unref (socket->priv->remote_address);
2896 socket->priv->remote_address = NULL;
2903 * g_socket_is_closed:
2904 * @socket: a #GSocket
2906 * Checks whether a socket is closed.
2908 * Returns: %TRUE if socket is closed, %FALSE otherwise
2913 g_socket_is_closed (GSocket *socket)
2915 return socket->priv->closed;
2919 /* Broken source, used on errors */
2921 broken_prepare (GSource *source,
2928 broken_check (GSource *source)
2934 broken_dispatch (GSource *source,
2935 GSourceFunc callback,
2941 static GSourceFuncs broken_funcs =
2950 network_events_for_condition (GIOCondition condition)
2954 if (condition & G_IO_IN)
2955 event_mask |= (FD_READ | FD_ACCEPT);
2956 if (condition & G_IO_OUT)
2957 event_mask |= (FD_WRITE | FD_CONNECT);
2958 event_mask |= FD_CLOSE;
2964 ensure_event (GSocket *socket)
2966 if (socket->priv->event == WSA_INVALID_EVENT)
2967 socket->priv->event = WSACreateEvent();
2971 update_select_events (GSocket *socket)
2978 ensure_event (socket);
2981 for (l = socket->priv->requested_conditions; l != NULL; l = l->next)
2984 event_mask |= network_events_for_condition (*ptr);
2987 if (event_mask != socket->priv->selected_events)
2989 /* If no events selected, disable event so we can unset
2992 if (event_mask == 0)
2995 event = socket->priv->event;
2997 if (WSAEventSelect (socket->priv->fd, event, event_mask) == 0)
2998 socket->priv->selected_events = event_mask;
3003 add_condition_watch (GSocket *socket,
3004 GIOCondition *condition)
3006 g_assert (g_list_find (socket->priv->requested_conditions, condition) == NULL);
3008 socket->priv->requested_conditions =
3009 g_list_prepend (socket->priv->requested_conditions, condition);
3011 update_select_events (socket);
3015 remove_condition_watch (GSocket *socket,
3016 GIOCondition *condition)
3018 g_assert (g_list_find (socket->priv->requested_conditions, condition) != NULL);
3020 socket->priv->requested_conditions =
3021 g_list_remove (socket->priv->requested_conditions, condition);
3023 update_select_events (socket);
3027 update_condition (GSocket *socket)
3029 WSANETWORKEVENTS events;
3030 GIOCondition condition;
3032 if (WSAEnumNetworkEvents (socket->priv->fd,
3033 socket->priv->event,
3036 socket->priv->current_events |= events.lNetworkEvents;
3037 if (events.lNetworkEvents & FD_WRITE &&
3038 events.iErrorCode[FD_WRITE_BIT] != 0)
3039 socket->priv->current_errors |= FD_WRITE;
3040 if (events.lNetworkEvents & FD_CONNECT &&
3041 events.iErrorCode[FD_CONNECT_BIT] != 0)
3042 socket->priv->current_errors |= FD_CONNECT;
3046 if (socket->priv->current_events & (FD_READ | FD_ACCEPT))
3047 condition |= G_IO_IN;
3049 if (socket->priv->current_events & FD_CLOSE)
3051 int r, errsv, buffer;
3053 r = recv (socket->priv->fd, &buffer, sizeof (buffer), MSG_PEEK);
3055 errsv = get_socket_errno ();
3058 (r < 0 && errsv == WSAENOTCONN))
3059 condition |= G_IO_IN;
3061 (r < 0 && (errsv == WSAESHUTDOWN || errsv == WSAECONNRESET ||
3062 errsv == WSAECONNABORTED || errsv == WSAENETRESET)))
3063 condition |= G_IO_HUP;
3065 condition |= G_IO_ERR;
3068 if (socket->priv->closed)
3069 condition |= G_IO_HUP;
3071 /* Never report both G_IO_OUT and HUP, these are
3072 mutually exclusive (can't write to a closed socket) */
3073 if ((condition & G_IO_HUP) == 0 &&
3074 socket->priv->current_events & FD_WRITE)
3076 if (socket->priv->current_errors & FD_WRITE)
3077 condition |= G_IO_ERR;
3079 condition |= G_IO_OUT;
3083 if (socket->priv->current_events & FD_CONNECT)
3085 if (socket->priv->current_errors & FD_CONNECT)
3086 condition |= (G_IO_HUP | G_IO_ERR);
3088 condition |= G_IO_OUT;
3100 GIOCondition condition;
3101 GCancellable *cancellable;
3102 GPollFD cancel_pollfd;
3103 gint64 timeout_time;
3107 socket_source_prepare (GSource *source,
3110 GSocketSource *socket_source = (GSocketSource *)source;
3112 if (g_cancellable_is_cancelled (socket_source->cancellable))
3115 if (socket_source->timeout_time)
3119 now = g_source_get_time (source);
3120 /* Round up to ensure that we don't try again too early */
3121 *timeout = (socket_source->timeout_time - now + 999) / 1000;
3124 socket_source->socket->priv->timed_out = TRUE;
3133 socket_source->pollfd.revents = update_condition (socket_source->socket);
3136 if ((socket_source->condition & socket_source->pollfd.revents) != 0)
3143 socket_source_check (GSource *source)
3147 return socket_source_prepare (source, &timeout);
3151 socket_source_dispatch (GSource *source,
3152 GSourceFunc callback,
3155 GSocketSourceFunc func = (GSocketSourceFunc)callback;
3156 GSocketSource *socket_source = (GSocketSource *)source;
3157 GSocket *socket = socket_source->socket;
3161 socket_source->pollfd.revents = update_condition (socket_source->socket);
3163 if (socket_source->socket->priv->timed_out)
3164 socket_source->pollfd.revents |= socket_source->condition & (G_IO_IN | G_IO_OUT);
3166 ret = (*func) (socket,
3167 socket_source->pollfd.revents & socket_source->condition,
3170 if (socket->priv->timeout)
3171 socket_source->timeout_time = g_get_monotonic_time () +
3172 socket->priv->timeout * 1000000;
3175 socket_source->timeout_time = 0;
3181 socket_source_finalize (GSource *source)
3183 GSocketSource *socket_source = (GSocketSource *)source;
3186 socket = socket_source->socket;
3189 remove_condition_watch (socket, &socket_source->condition);
3192 g_object_unref (socket);
3194 if (socket_source->cancellable)
3196 g_cancellable_release_fd (socket_source->cancellable);
3197 g_object_unref (socket_source->cancellable);
3202 socket_source_closure_callback (GSocket *socket,
3203 GIOCondition condition,
3206 GClosure *closure = data;
3208 GValue params[2] = { G_VALUE_INIT, G_VALUE_INIT };
3209 GValue result_value = G_VALUE_INIT;
3212 g_value_init (&result_value, G_TYPE_BOOLEAN);
3214 g_value_init (¶ms[0], G_TYPE_SOCKET);
3215 g_value_set_object (¶ms[0], socket);
3216 g_value_init (¶ms[1], G_TYPE_IO_CONDITION);
3217 g_value_set_flags (¶ms[1], condition);
3219 g_closure_invoke (closure, &result_value, 2, params, NULL);
3221 result = g_value_get_boolean (&result_value);
3222 g_value_unset (&result_value);
3223 g_value_unset (¶ms[0]);
3224 g_value_unset (¶ms[1]);
3229 static GSourceFuncs socket_source_funcs =
3231 socket_source_prepare,
3232 socket_source_check,
3233 socket_source_dispatch,
3234 socket_source_finalize,
3235 (GSourceFunc)socket_source_closure_callback,
3236 (GSourceDummyMarshal)g_cclosure_marshal_generic,
3240 socket_source_new (GSocket *socket,
3241 GIOCondition condition,
3242 GCancellable *cancellable)
3245 GSocketSource *socket_source;
3248 ensure_event (socket);
3250 if (socket->priv->event == WSA_INVALID_EVENT)
3252 g_warning ("Failed to create WSAEvent");
3253 return g_source_new (&broken_funcs, sizeof (GSource));
3257 condition |= G_IO_HUP | G_IO_ERR;
3259 source = g_source_new (&socket_source_funcs, sizeof (GSocketSource));
3260 g_source_set_name (source, "GSocket");
3261 socket_source = (GSocketSource *)source;
3263 socket_source->socket = g_object_ref (socket);
3264 socket_source->condition = condition;
3266 if (g_cancellable_make_pollfd (cancellable,
3267 &socket_source->cancel_pollfd))
3269 socket_source->cancellable = g_object_ref (cancellable);
3270 g_source_add_poll (source, &socket_source->cancel_pollfd);
3274 add_condition_watch (socket, &socket_source->condition);
3275 socket_source->pollfd.fd = (gintptr) socket->priv->event;
3277 socket_source->pollfd.fd = socket->priv->fd;
3280 socket_source->pollfd.events = condition;
3281 socket_source->pollfd.revents = 0;
3282 g_source_add_poll (source, &socket_source->pollfd);
3284 if (socket->priv->timeout)
3285 socket_source->timeout_time = g_get_monotonic_time () +
3286 socket->priv->timeout * 1000000;
3289 socket_source->timeout_time = 0;
3295 * g_socket_create_source: (skip)
3296 * @socket: a #GSocket
3297 * @condition: a #GIOCondition mask to monitor
3298 * @cancellable: (allow-none): a %GCancellable or %NULL
3300 * Creates a %GSource that can be attached to a %GMainContext to monitor
3301 * for the availibility of the specified @condition on the socket.
3303 * The callback on the source is of the #GSocketSourceFunc type.
3305 * It is meaningless to specify %G_IO_ERR or %G_IO_HUP in @condition;
3306 * these conditions will always be reported output if they are true.
3308 * @cancellable if not %NULL can be used to cancel the source, which will
3309 * cause the source to trigger, reporting the current condition (which
3310 * is likely 0 unless cancellation happened at the same time as a
3311 * condition change). You can check for this in the callback using
3312 * g_cancellable_is_cancelled().
3314 * If @socket has a timeout set, and it is reached before @condition
3315 * occurs, the source will then trigger anyway, reporting %G_IO_IN or
3316 * %G_IO_OUT depending on @condition. However, @socket will have been
3317 * marked as having had a timeout, and so the next #GSocket I/O method
3318 * you call will then fail with a %G_IO_ERROR_TIMED_OUT.
3320 * Returns: (transfer full): a newly allocated %GSource, free with g_source_unref().
3325 g_socket_create_source (GSocket *socket,
3326 GIOCondition condition,
3327 GCancellable *cancellable)
3329 g_return_val_if_fail (G_IS_SOCKET (socket) && (cancellable == NULL || G_IS_CANCELLABLE (cancellable)), NULL);
3331 return socket_source_new (socket, condition, cancellable);
3335 * g_socket_condition_check:
3336 * @socket: a #GSocket
3337 * @condition: a #GIOCondition mask to check
3339 * Checks on the readiness of @socket to perform operations.
3340 * The operations specified in @condition are checked for and masked
3341 * against the currently-satisfied conditions on @socket. The result
3344 * Note that on Windows, it is possible for an operation to return
3345 * %G_IO_ERROR_WOULD_BLOCK even immediately after
3346 * g_socket_condition_check() has claimed that the socket is ready for
3347 * writing. Rather than calling g_socket_condition_check() and then
3348 * writing to the socket if it succeeds, it is generally better to
3349 * simply try writing to the socket right away, and try again later if
3350 * the initial attempt returns %G_IO_ERROR_WOULD_BLOCK.
3352 * It is meaningless to specify %G_IO_ERR or %G_IO_HUP in condition;
3353 * these conditions will always be set in the output if they are true.
3355 * This call never blocks.
3357 * Returns: the @GIOCondition mask of the current state
3362 g_socket_condition_check (GSocket *socket,
3363 GIOCondition condition)
3365 g_return_val_if_fail (G_IS_SOCKET (socket), 0);
3367 if (!check_socket (socket, NULL))
3372 GIOCondition current_condition;
3374 condition |= G_IO_ERR | G_IO_HUP;
3376 add_condition_watch (socket, &condition);
3377 current_condition = update_condition (socket);
3378 remove_condition_watch (socket, &condition);
3379 return condition & current_condition;
3385 poll_fd.fd = socket->priv->fd;
3386 poll_fd.events = condition;
3389 result = g_poll (&poll_fd, 1, 0);
3390 while (result == -1 && get_socket_errno () == EINTR);
3392 return poll_fd.revents;
3398 * g_socket_condition_wait:
3399 * @socket: a #GSocket
3400 * @condition: a #GIOCondition mask to wait for
3401 * @cancellable: (allow-none): a #GCancellable, or %NULL
3402 * @error: a #GError pointer, or %NULL
3404 * Waits for @condition to become true on @socket. When the condition
3405 * is met, %TRUE is returned.
3407 * If @cancellable is cancelled before the condition is met, or if the
3408 * socket has a timeout set and it is reached before the condition is
3409 * met, then %FALSE is returned and @error, if non-%NULL, is set to
3410 * the appropriate value (%G_IO_ERROR_CANCELLED or
3411 * %G_IO_ERROR_TIMED_OUT).
3413 * See also g_socket_condition_timed_wait().
3415 * Returns: %TRUE if the condition was met, %FALSE otherwise
3420 g_socket_condition_wait (GSocket *socket,
3421 GIOCondition condition,
3422 GCancellable *cancellable,
3425 g_return_val_if_fail (G_IS_SOCKET (socket), FALSE);
3427 return g_socket_condition_timed_wait (socket, condition, -1,
3428 cancellable, error);
3432 * g_socket_condition_timed_wait:
3433 * @socket: a #GSocket
3434 * @condition: a #GIOCondition mask to wait for
3435 * @timeout: the maximum time (in microseconds) to wait, or -1
3436 * @cancellable: (allow-none): a #GCancellable, or %NULL
3437 * @error: a #GError pointer, or %NULL
3439 * Waits for up to @timeout microseconds for @condition to become true
3440 * on @socket. If the condition is met, %TRUE is returned.
3442 * If @cancellable is cancelled before the condition is met, or if
3443 * @timeout (or the socket's #GSocket:timeout) is reached before the
3444 * condition is met, then %FALSE is returned and @error, if non-%NULL,
3445 * is set to the appropriate value (%G_IO_ERROR_CANCELLED or
3446 * %G_IO_ERROR_TIMED_OUT).
3448 * If you don't want a timeout, use g_socket_condition_wait().
3449 * (Alternatively, you can pass -1 for @timeout.)
3451 * Note that although @timeout is in microseconds for consistency with
3452 * other GLib APIs, this function actually only has millisecond
3453 * resolution, and the behavior is undefined if @timeout is not an
3454 * exact number of milliseconds.
3456 * Returns: %TRUE if the condition was met, %FALSE otherwise
3461 g_socket_condition_timed_wait (GSocket *socket,
3462 GIOCondition condition,
3464 GCancellable *cancellable,
3469 g_return_val_if_fail (G_IS_SOCKET (socket), FALSE);
3471 if (!check_socket (socket, error))
3474 if (g_cancellable_set_error_if_cancelled (cancellable, error))
3477 if (socket->priv->timeout &&
3478 (timeout < 0 || socket->priv->timeout < timeout / G_USEC_PER_SEC))
3479 timeout = socket->priv->timeout * 1000;
3480 else if (timeout != -1)
3481 timeout = timeout / 1000;
3483 start_time = g_get_monotonic_time ();
3487 GIOCondition current_condition;
3493 /* Always check these */
3494 condition |= G_IO_ERR | G_IO_HUP;
3496 add_condition_watch (socket, &condition);
3499 events[num_events++] = socket->priv->event;
3501 if (g_cancellable_make_pollfd (cancellable, &cancel_fd))
3502 events[num_events++] = (WSAEVENT)cancel_fd.fd;
3505 timeout = WSA_INFINITE;
3507 current_condition = update_condition (socket);
3508 while ((condition & current_condition) == 0)
3510 res = WSAWaitForMultipleEvents (num_events, events,
3511 FALSE, timeout, FALSE);
3512 if (res == WSA_WAIT_FAILED)
3514 int errsv = get_socket_errno ();
3516 g_set_error (error, G_IO_ERROR,
3517 socket_io_error_from_errno (errsv),
3518 _("Waiting for socket condition: %s"),
3519 socket_strerror (errsv));
3522 else if (res == WSA_WAIT_TIMEOUT)
3524 g_set_error_literal (error, G_IO_ERROR, G_IO_ERROR_TIMED_OUT,
3525 _("Socket I/O timed out"));
3529 if (g_cancellable_set_error_if_cancelled (cancellable, error))
3532 current_condition = update_condition (socket);
3534 if (timeout != WSA_INFINITE)
3536 timeout -= (g_get_monotonic_time () - start_time) * 1000;
3541 remove_condition_watch (socket, &condition);
3543 g_cancellable_release_fd (cancellable);
3545 return (condition & current_condition) != 0;
3553 poll_fd[0].fd = socket->priv->fd;
3554 poll_fd[0].events = condition;
3557 if (g_cancellable_make_pollfd (cancellable, &poll_fd[1]))
3562 result = g_poll (poll_fd, num, timeout);
3563 if (result != -1 || errno != EINTR)
3568 timeout -= (g_get_monotonic_time () - start_time) * 1000;
3575 g_cancellable_release_fd (cancellable);
3579 g_set_error_literal (error, G_IO_ERROR, G_IO_ERROR_TIMED_OUT,
3580 _("Socket I/O timed out"));
3584 return !g_cancellable_set_error_if_cancelled (cancellable, error);
3590 * g_socket_send_message:
3591 * @socket: a #GSocket
3592 * @address: (allow-none): a #GSocketAddress, or %NULL
3593 * @vectors: (array length=num_vectors): an array of #GOutputVector structs
3594 * @num_vectors: the number of elements in @vectors, or -1
3595 * @messages: (array length=num_messages) (allow-none): a pointer to an
3596 * array of #GSocketControlMessages, or %NULL.
3597 * @num_messages: number of elements in @messages, or -1.
3598 * @flags: an int containing #GSocketMsgFlags flags
3599 * @cancellable: (allow-none): a %GCancellable or %NULL
3600 * @error: #GError for error reporting, or %NULL to ignore.
3602 * Send data to @address on @socket. This is the most complicated and
3603 * fully-featured version of this call. For easier use, see
3604 * g_socket_send() and g_socket_send_to().
3606 * If @address is %NULL then the message is sent to the default receiver
3607 * (set by g_socket_connect()).
3609 * @vectors must point to an array of #GOutputVector structs and
3610 * @num_vectors must be the length of this array. (If @num_vectors is -1,
3611 * then @vectors is assumed to be terminated by a #GOutputVector with a
3612 * %NULL buffer pointer.) The #GOutputVector structs describe the buffers
3613 * that the sent data will be gathered from. Using multiple
3614 * #GOutputVector<!-- -->s is more memory-efficient than manually copying
3615 * data from multiple sources into a single buffer, and more
3616 * network-efficient than making multiple calls to g_socket_send().
3618 * @messages, if non-%NULL, is taken to point to an array of @num_messages
3619 * #GSocketControlMessage instances. These correspond to the control
3620 * messages to be sent on the socket.
3621 * If @num_messages is -1 then @messages is treated as a %NULL-terminated
3624 * @flags modify how the message is sent. The commonly available arguments
3625 * for this are available in the #GSocketMsgFlags enum, but the
3626 * values there are the same as the system values, and the flags
3627 * are passed in as-is, so you can pass in system-specific flags too.
3629 * If the socket is in blocking mode the call will block until there is
3630 * space for the data in the socket queue. If there is no space available
3631 * and the socket is in non-blocking mode a %G_IO_ERROR_WOULD_BLOCK error
3632 * will be returned. To be notified when space is available, wait for the
3633 * %G_IO_OUT condition. Note though that you may still receive
3634 * %G_IO_ERROR_WOULD_BLOCK from g_socket_send() even if you were previously
3635 * notified of a %G_IO_OUT condition. (On Windows in particular, this is
3636 * very common due to the way the underlying APIs work.)
3638 * On error -1 is returned and @error is set accordingly.
3640 * Returns: Number of bytes written (which may be less than @size), or -1
3646 g_socket_send_message (GSocket *socket,
3647 GSocketAddress *address,
3648 GOutputVector *vectors,
3650 GSocketControlMessage **messages,
3653 GCancellable *cancellable,
3656 GOutputVector one_vector;
3659 g_return_val_if_fail (G_IS_SOCKET (socket), -1);
3661 if (!check_socket (socket, error))
3664 if (g_cancellable_set_error_if_cancelled (cancellable, error))
3667 if (num_vectors == -1)
3669 for (num_vectors = 0;
3670 vectors[num_vectors].buffer != NULL;
3675 if (num_messages == -1)
3677 for (num_messages = 0;
3678 messages != NULL && messages[num_messages] != NULL;
3683 if (num_vectors == 0)
3687 one_vector.buffer = &zero;
3688 one_vector.size = 1;
3690 vectors = &one_vector;
3703 msg.msg_namelen = g_socket_address_get_native_size (address);
3704 msg.msg_name = g_alloca (msg.msg_namelen);
3705 if (!g_socket_address_to_native (address, msg.msg_name, msg.msg_namelen, error))
3710 msg.msg_name = NULL;
3711 msg.msg_namelen = 0;
3716 /* this entire expression will be evaluated at compile time */
3717 if (sizeof *msg.msg_iov == sizeof *vectors &&
3718 sizeof msg.msg_iov->iov_base == sizeof vectors->buffer &&
3719 G_STRUCT_OFFSET (struct iovec, iov_base) ==
3720 G_STRUCT_OFFSET (GOutputVector, buffer) &&
3721 sizeof msg.msg_iov->iov_len == sizeof vectors->size &&
3722 G_STRUCT_OFFSET (struct iovec, iov_len) ==
3723 G_STRUCT_OFFSET (GOutputVector, size))
3724 /* ABI is compatible */
3726 msg.msg_iov = (struct iovec *) vectors;
3727 msg.msg_iovlen = num_vectors;
3730 /* ABI is incompatible */
3734 msg.msg_iov = g_newa (struct iovec, num_vectors);
3735 for (i = 0; i < num_vectors; i++)
3737 msg.msg_iov[i].iov_base = (void *) vectors[i].buffer;
3738 msg.msg_iov[i].iov_len = vectors[i].size;
3740 msg.msg_iovlen = num_vectors;
3746 struct cmsghdr *cmsg;
3749 msg.msg_controllen = 0;
3750 for (i = 0; i < num_messages; i++)
3751 msg.msg_controllen += CMSG_SPACE (g_socket_control_message_get_size (messages[i]));
3753 if (msg.msg_controllen == 0)
3754 msg.msg_control = NULL;
3757 msg.msg_control = g_alloca (msg.msg_controllen);
3758 memset (msg.msg_control, '\0', msg.msg_controllen);
3761 cmsg = CMSG_FIRSTHDR (&msg);
3762 for (i = 0; i < num_messages; i++)
3764 cmsg->cmsg_level = g_socket_control_message_get_level (messages[i]);
3765 cmsg->cmsg_type = g_socket_control_message_get_msg_type (messages[i]);
3766 cmsg->cmsg_len = CMSG_LEN (g_socket_control_message_get_size (messages[i]));
3767 g_socket_control_message_serialize (messages[i],
3769 cmsg = CMSG_NXTHDR (&msg, cmsg);
3771 g_assert (cmsg == NULL);
3776 if (socket->priv->blocking &&
3777 !g_socket_condition_wait (socket,
3778 G_IO_OUT, cancellable, error))
3781 result = sendmsg (socket->priv->fd, &msg, flags | G_SOCKET_DEFAULT_SEND_FLAGS);
3784 int errsv = get_socket_errno ();
3789 if (socket->priv->blocking &&
3790 (errsv == EWOULDBLOCK ||
3794 g_set_error (error, G_IO_ERROR,
3795 socket_io_error_from_errno (errsv),
3796 _("Error sending message: %s"), socket_strerror (errsv));
3807 struct sockaddr_storage addr;
3814 /* Win32 doesn't support control messages.
3815 Actually this is possible for raw and datagram sockets
3816 via WSASendMessage on Vista or later, but that doesn't
3818 if (num_messages != 0)
3820 g_set_error_literal (error, G_IO_ERROR, G_IO_ERROR_NOT_SUPPORTED,
3821 _("GSocketControlMessage not supported on windows"));
3826 bufs = g_newa (WSABUF, num_vectors);
3827 for (i = 0; i < num_vectors; i++)
3829 bufs[i].buf = (char *)vectors[i].buffer;
3830 bufs[i].len = (gulong)vectors[i].size;
3834 addrlen = 0; /* Avoid warning */
3837 addrlen = g_socket_address_get_native_size (address);
3838 if (!g_socket_address_to_native (address, &addr, sizeof addr, error))
3844 if (socket->priv->blocking &&
3845 !g_socket_condition_wait (socket,
3846 G_IO_OUT, cancellable, error))
3850 result = WSASendTo (socket->priv->fd,
3853 (const struct sockaddr *)&addr, addrlen,
3856 result = WSASend (socket->priv->fd,
3863 int errsv = get_socket_errno ();
3865 if (errsv == WSAEINTR)
3868 if (errsv == WSAEWOULDBLOCK)
3869 win32_unset_event_mask (socket, FD_WRITE);
3871 if (socket->priv->blocking &&
3872 errsv == WSAEWOULDBLOCK)
3875 g_set_error (error, G_IO_ERROR,
3876 socket_io_error_from_errno (errsv),
3877 _("Error sending message: %s"), socket_strerror (errsv));
3890 * g_socket_receive_message:
3891 * @socket: a #GSocket
3892 * @address: (out) (allow-none): a pointer to a #GSocketAddress
3894 * @vectors: (array length=num_vectors): an array of #GInputVector structs
3895 * @num_vectors: the number of elements in @vectors, or -1
3896 * @messages: (array length=num_messages) (allow-none): a pointer which
3897 * may be filled with an array of #GSocketControlMessages, or %NULL
3898 * @num_messages: a pointer which will be filled with the number of
3899 * elements in @messages, or %NULL
3900 * @flags: a pointer to an int containing #GSocketMsgFlags flags
3901 * @cancellable: (allow-none): a %GCancellable or %NULL
3902 * @error: a #GError pointer, or %NULL
3904 * Receive data from a socket. This is the most complicated and
3905 * fully-featured version of this call. For easier use, see
3906 * g_socket_receive() and g_socket_receive_from().
3908 * If @address is non-%NULL then @address will be set equal to the
3909 * source address of the received packet.
3910 * @address is owned by the caller.
3912 * @vector must point to an array of #GInputVector structs and
3913 * @num_vectors must be the length of this array. These structs
3914 * describe the buffers that received data will be scattered into.
3915 * If @num_vectors is -1, then @vectors is assumed to be terminated
3916 * by a #GInputVector with a %NULL buffer pointer.
3918 * As a special case, if @num_vectors is 0 (in which case, @vectors
3919 * may of course be %NULL), then a single byte is received and
3920 * discarded. This is to facilitate the common practice of sending a
3921 * single '\0' byte for the purposes of transferring ancillary data.
3923 * @messages, if non-%NULL, will be set to point to a newly-allocated
3924 * array of #GSocketControlMessage instances or %NULL if no such
3925 * messages was received. These correspond to the control messages
3926 * received from the kernel, one #GSocketControlMessage per message
3927 * from the kernel. This array is %NULL-terminated and must be freed
3928 * by the caller using g_free() after calling g_object_unref() on each
3929 * element. If @messages is %NULL, any control messages received will
3932 * @num_messages, if non-%NULL, will be set to the number of control
3933 * messages received.
3935 * If both @messages and @num_messages are non-%NULL, then
3936 * @num_messages gives the number of #GSocketControlMessage instances
3937 * in @messages (ie: not including the %NULL terminator).
3939 * @flags is an in/out parameter. The commonly available arguments
3940 * for this are available in the #GSocketMsgFlags enum, but the
3941 * values there are the same as the system values, and the flags
3942 * are passed in as-is, so you can pass in system-specific flags too
3943 * (and g_socket_receive_message() may pass system-specific flags out).
3945 * As with g_socket_receive(), data may be discarded if @socket is
3946 * %G_SOCKET_TYPE_DATAGRAM or %G_SOCKET_TYPE_SEQPACKET and you do not
3947 * provide enough buffer space to read a complete message. You can pass
3948 * %G_SOCKET_MSG_PEEK in @flags to peek at the current message without
3949 * removing it from the receive queue, but there is no portable way to find
3950 * out the length of the message other than by reading it into a
3951 * sufficiently-large buffer.
3953 * If the socket is in blocking mode the call will block until there
3954 * is some data to receive, the connection is closed, or there is an
3955 * error. If there is no data available and the socket is in
3956 * non-blocking mode, a %G_IO_ERROR_WOULD_BLOCK error will be
3957 * returned. To be notified when data is available, wait for the
3958 * %G_IO_IN condition.
3960 * On error -1 is returned and @error is set accordingly.
3962 * Returns: Number of bytes read, or 0 if the connection was closed by
3963 * the peer, or -1 on error
3968 g_socket_receive_message (GSocket *socket,
3969 GSocketAddress **address,
3970 GInputVector *vectors,
3972 GSocketControlMessage ***messages,
3975 GCancellable *cancellable,
3978 GInputVector one_vector;
3981 g_return_val_if_fail (G_IS_SOCKET (socket), -1);
3983 if (!check_socket (socket, error))
3986 if (g_cancellable_set_error_if_cancelled (cancellable, error))
3989 if (num_vectors == -1)
3991 for (num_vectors = 0;
3992 vectors[num_vectors].buffer != NULL;
3997 if (num_vectors == 0)
3999 one_vector.buffer = &one_byte;
4000 one_vector.size = 1;
4002 vectors = &one_vector;
4009 struct sockaddr_storage one_sockaddr;
4014 msg.msg_name = &one_sockaddr;
4015 msg.msg_namelen = sizeof (struct sockaddr_storage);
4019 msg.msg_name = NULL;
4020 msg.msg_namelen = 0;
4024 /* this entire expression will be evaluated at compile time */
4025 if (sizeof *msg.msg_iov == sizeof *vectors &&
4026 sizeof msg.msg_iov->iov_base == sizeof vectors->buffer &&
4027 G_STRUCT_OFFSET (struct iovec, iov_base) ==
4028 G_STRUCT_OFFSET (GInputVector, buffer) &&
4029 sizeof msg.msg_iov->iov_len == sizeof vectors->size &&
4030 G_STRUCT_OFFSET (struct iovec, iov_len) ==
4031 G_STRUCT_OFFSET (GInputVector, size))
4032 /* ABI is compatible */
4034 msg.msg_iov = (struct iovec *) vectors;
4035 msg.msg_iovlen = num_vectors;
4038 /* ABI is incompatible */
4042 msg.msg_iov = g_newa (struct iovec, num_vectors);
4043 for (i = 0; i < num_vectors; i++)
4045 msg.msg_iov[i].iov_base = vectors[i].buffer;
4046 msg.msg_iov[i].iov_len = vectors[i].size;
4048 msg.msg_iovlen = num_vectors;
4052 msg.msg_control = g_alloca (2048);
4053 msg.msg_controllen = 2048;
4057 msg.msg_flags = *flags;
4061 /* We always set the close-on-exec flag so we don't leak file
4062 * descriptors into child processes. Note that gunixfdmessage.c
4063 * will later call fcntl (fd, FD_CLOEXEC), but that isn't atomic.
4065 #ifdef MSG_CMSG_CLOEXEC
4066 msg.msg_flags |= MSG_CMSG_CLOEXEC;
4072 if (socket->priv->blocking &&
4073 !g_socket_condition_wait (socket,
4074 G_IO_IN, cancellable, error))
4077 result = recvmsg (socket->priv->fd, &msg, msg.msg_flags);
4078 #ifdef MSG_CMSG_CLOEXEC
4079 if (result < 0 && get_socket_errno () == EINVAL)
4081 /* We must be running on an old kernel. Call without the flag. */
4082 msg.msg_flags &= ~(MSG_CMSG_CLOEXEC);
4083 result = recvmsg (socket->priv->fd, &msg, msg.msg_flags);
4089 int errsv = get_socket_errno ();
4094 if (socket->priv->blocking &&
4095 (errsv == EWOULDBLOCK ||
4099 g_set_error (error, G_IO_ERROR,
4100 socket_io_error_from_errno (errsv),
4101 _("Error receiving message: %s"), socket_strerror (errsv));
4108 /* decode address */
4109 if (address != NULL)
4111 if (msg.msg_namelen > 0)
4112 *address = g_socket_address_new_from_native (msg.msg_name,
4118 /* decode control messages */
4120 GPtrArray *my_messages = NULL;
4121 struct cmsghdr *cmsg;
4123 for (cmsg = CMSG_FIRSTHDR (&msg); cmsg; cmsg = CMSG_NXTHDR (&msg, cmsg))
4125 GSocketControlMessage *message;
4127 message = g_socket_control_message_deserialize (cmsg->cmsg_level,
4129 cmsg->cmsg_len - ((char *)CMSG_DATA (cmsg) - (char *)cmsg),
4131 if (message == NULL)
4132 /* We've already spewed about the problem in the
4133 deserialization code, so just continue */
4136 if (messages == NULL)
4138 /* we have to do it this way if the user ignores the
4139 * messages so that we will close any received fds.
4141 g_object_unref (message);
4145 if (my_messages == NULL)
4146 my_messages = g_ptr_array_new ();
4147 g_ptr_array_add (my_messages, message);
4152 *num_messages = my_messages != NULL ? my_messages->len : 0;
4156 if (my_messages == NULL)
4162 g_ptr_array_add (my_messages, NULL);
4163 *messages = (GSocketControlMessage **) g_ptr_array_free (my_messages, FALSE);
4168 g_assert (my_messages == NULL);
4172 /* capture the flags */
4174 *flags = msg.msg_flags;
4180 struct sockaddr_storage addr;
4182 DWORD bytes_received;
4189 bufs = g_newa (WSABUF, num_vectors);
4190 for (i = 0; i < num_vectors; i++)
4192 bufs[i].buf = (char *)vectors[i].buffer;
4193 bufs[i].len = (gulong)vectors[i].size;
4205 if (socket->priv->blocking &&
4206 !g_socket_condition_wait (socket,
4207 G_IO_IN, cancellable, error))
4210 addrlen = sizeof addr;
4212 result = WSARecvFrom (socket->priv->fd,
4214 &bytes_received, &win_flags,
4215 (struct sockaddr *)&addr, &addrlen,
4218 result = WSARecv (socket->priv->fd,
4220 &bytes_received, &win_flags,
4224 int errsv = get_socket_errno ();
4226 if (errsv == WSAEINTR)
4229 win32_unset_event_mask (socket, FD_READ);
4231 if (socket->priv->blocking &&
4232 errsv == WSAEWOULDBLOCK)
4235 g_set_error (error, G_IO_ERROR,
4236 socket_io_error_from_errno (errsv),
4237 _("Error receiving message: %s"), socket_strerror (errsv));
4241 win32_unset_event_mask (socket, FD_READ);
4245 /* decode address */
4246 if (address != NULL)
4249 *address = g_socket_address_new_from_native (&addr, addrlen);
4254 /* capture the flags */
4258 if (messages != NULL)
4260 if (num_messages != NULL)
4263 return bytes_received;
4269 * g_socket_get_credentials:
4270 * @socket: a #GSocket.
4271 * @error: #GError for error reporting, or %NULL to ignore.
4273 * Returns the credentials of the foreign process connected to this
4274 * socket, if any (e.g. it is only supported for %G_SOCKET_FAMILY_UNIX
4277 * If this operation isn't supported on the OS, the method fails with
4278 * the %G_IO_ERROR_NOT_SUPPORTED error. On Linux this is implemented
4279 * by reading the %SO_PEERCRED option on the underlying socket.
4281 * Other ways to obtain credentials from a foreign peer includes the
4282 * #GUnixCredentialsMessage type and
4283 * g_unix_connection_send_credentials() /
4284 * g_unix_connection_receive_credentials() functions.
4286 * Returns: (transfer full): %NULL if @error is set, otherwise a #GCredentials object
4287 * that must be freed with g_object_unref().
4292 g_socket_get_credentials (GSocket *socket,
4297 g_return_val_if_fail (G_IS_SOCKET (socket), NULL);
4298 g_return_val_if_fail (error == NULL || *error == NULL, NULL);
4302 #if defined(__linux__) || defined(__OpenBSD__)
4305 #if defined(__linux__)
4306 struct ucred native_creds;
4307 optlen = sizeof (struct ucred);
4308 #elif defined(__OpenBSD__)
4309 struct sockpeercred native_creds;
4310 optlen = sizeof (struct sockpeercred);
4312 if (getsockopt (socket->priv->fd,
4315 (void *)&native_creds,
4318 int errsv = get_socket_errno ();
4321 socket_io_error_from_errno (errsv),
4322 _("Unable to get pending error: %s"),
4323 socket_strerror (errsv));
4327 ret = g_credentials_new ();
4328 g_credentials_set_native (ret,
4329 #if defined(__linux__)
4330 G_CREDENTIALS_TYPE_LINUX_UCRED,
4331 #elif defined(__OpenBSD__)
4332 G_CREDENTIALS_TYPE_OPENBSD_SOCKPEERCRED,
4338 g_set_error_literal (error,
4340 G_IO_ERROR_NOT_SUPPORTED,
4341 _("g_socket_get_credentials not implemented for this OS"));