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, see <http://www.gnu.org/licenses/>.
20 * Authors: Christian Kellner <gicmo@gnome.org>
21 * Samuel Cormier-Iijima <sciyoshi@gmail.com>
22 * Ryan Lortie <desrt@desrt.ca>
23 * Alexander Larsson <alexl@redhat.com>
31 #include "glib-unix.h"
42 # include <sys/ioctl.h>
45 #ifdef HAVE_SYS_FILIO_H
46 # include <sys/filio.h>
53 #include "gcancellable.h"
54 #include "gioenumtypes.h"
55 #include "ginetaddress.h"
56 #include "ginitable.h"
60 #include "gnetworkingprivate.h"
61 #include "gsocketaddress.h"
62 #include "gsocketcontrolmessage.h"
63 #include "gcredentials.h"
64 #include "gcredentialsprivate.h"
69 * @short_description: Low-level socket object
71 * @see_also: #GInitable, [<gnetworking.h>][gio-gnetworking.h]
73 * A #GSocket is a low-level networking primitive. It is a more or less
74 * direct mapping of the BSD socket API in a portable GObject based API.
75 * It supports both the UNIX socket implementations and winsock2 on Windows.
77 * #GSocket is the platform independent base upon which the higher level
78 * network primitives are based. Applications are not typically meant to
79 * use it directly, but rather through classes like #GSocketClient,
80 * #GSocketService and #GSocketConnection. However there may be cases where
81 * direct use of #GSocket is useful.
83 * #GSocket implements the #GInitable interface, so if it is manually constructed
84 * by e.g. g_object_new() you must call g_initable_init() and check the
85 * results before using the object. This is done automatically in
86 * g_socket_new() and g_socket_new_from_fd(), so these functions can return
89 * Sockets operate in two general modes, blocking or non-blocking. When
90 * in blocking mode all operations block until the requested operation
91 * is finished or there is an error. In non-blocking mode all calls that
92 * would block return immediately with a %G_IO_ERROR_WOULD_BLOCK error.
93 * To know when a call would successfully run you can call g_socket_condition_check(),
94 * or g_socket_condition_wait(). You can also use g_socket_create_source() and
95 * attach it to a #GMainContext to get callbacks when I/O is possible.
96 * Note that all sockets are always set to non blocking mode in the system, and
97 * blocking mode is emulated in GSocket.
99 * When working in non-blocking mode applications should always be able to
100 * handle getting a %G_IO_ERROR_WOULD_BLOCK error even when some other
101 * function said that I/O was possible. This can easily happen in case
102 * of a race condition in the application, but it can also happen for other
103 * reasons. For instance, on Windows a socket is always seen as writable
104 * until a write returns %G_IO_ERROR_WOULD_BLOCK.
106 * #GSockets can be either connection oriented or datagram based.
107 * For connection oriented types you must first establish a connection by
108 * either connecting to an address or accepting a connection from another
109 * address. For connectionless socket types the target/source address is
110 * specified or received in each I/O operation.
112 * All socket file descriptors are set to be close-on-exec.
114 * Note that creating a #GSocket causes the signal %SIGPIPE to be
115 * ignored for the remainder of the program. If you are writing a
116 * command-line utility that uses #GSocket, you may need to take into
117 * account the fact that your program will not automatically be killed
118 * if it tries to write to %stdout after it has been closed.
123 static void g_socket_initable_iface_init (GInitableIface *iface);
124 static gboolean g_socket_initable_init (GInitable *initable,
125 GCancellable *cancellable,
143 PROP_MULTICAST_LOOPBACK,
147 /* Size of the receiver cache for g_socket_receive_from() */
148 #define RECV_ADDR_CACHE_SIZE 8
150 struct _GSocketPrivate
152 GSocketFamily family;
154 GSocketProtocol protocol;
158 GError *construct_error;
159 GSocketAddress *remote_address;
167 guint connect_pending : 1;
173 GList *requested_conditions; /* list of requested GIOCondition * */
174 GMutex win32_source_lock;
178 GSocketAddress *addr;
179 struct sockaddr *native;
182 } recv_addr_cache[RECV_ADDR_CACHE_SIZE];
185 G_DEFINE_TYPE_WITH_CODE (GSocket, g_socket, G_TYPE_OBJECT,
186 G_ADD_PRIVATE (GSocket)
187 g_networking_init ();
188 G_IMPLEMENT_INTERFACE (G_TYPE_INITABLE,
189 g_socket_initable_iface_init));
192 get_socket_errno (void)
197 return WSAGetLastError ();
202 socket_io_error_from_errno (int err)
205 return g_io_error_from_errno (err);
210 return G_IO_ERROR_ADDRESS_IN_USE;
212 return G_IO_ERROR_WOULD_BLOCK;
214 return G_IO_ERROR_PERMISSION_DENIED;
215 case WSA_INVALID_HANDLE:
216 case WSA_INVALID_PARAMETER:
219 return G_IO_ERROR_INVALID_ARGUMENT;
220 case WSAEPROTONOSUPPORT:
221 return G_IO_ERROR_NOT_SUPPORTED;
223 return G_IO_ERROR_CANCELLED;
224 case WSAESOCKTNOSUPPORT:
226 case WSAEPFNOSUPPORT:
227 case WSAEAFNOSUPPORT:
228 return G_IO_ERROR_NOT_SUPPORTED;
230 return G_IO_ERROR_FAILED;
236 socket_strerror (int err)
239 return g_strerror (err);
244 msg = g_win32_error_message (err);
246 msg_ret = g_intern_string (msg);
254 #define win32_unset_event_mask(_socket, _mask) _win32_unset_event_mask (_socket, _mask)
256 _win32_unset_event_mask (GSocket *socket, int mask)
258 socket->priv->current_events &= ~mask;
259 socket->priv->current_errors &= ~mask;
262 #define win32_unset_event_mask(_socket, _mask)
265 /* Windows has broken prototypes... */
267 #define getsockopt(sockfd, level, optname, optval, optlen) \
268 getsockopt (sockfd, level, optname, (gpointer) optval, (int*) optlen)
269 #define setsockopt(sockfd, level, optname, optval, optlen) \
270 setsockopt (sockfd, level, optname, (gpointer) optval, optlen)
271 #define getsockname(sockfd, addr, addrlen) \
272 getsockname (sockfd, addr, (int *)addrlen)
273 #define getpeername(sockfd, addr, addrlen) \
274 getpeername (sockfd, addr, (int *)addrlen)
275 #define recv(sockfd, buf, len, flags) \
276 recv (sockfd, (gpointer)buf, len, flags)
280 set_fd_nonblocking (int fd)
283 GError *error = NULL;
289 if (!g_unix_set_fd_nonblocking (fd, TRUE, &error))
291 g_warning ("Error setting socket nonblocking: %s", error->message);
292 g_clear_error (&error);
297 if (ioctlsocket (fd, FIONBIO, &arg) == SOCKET_ERROR)
299 int errsv = get_socket_errno ();
300 g_warning ("Error setting socket status flags: %s", socket_strerror (errsv));
306 check_socket (GSocket *socket,
309 if (!socket->priv->inited)
311 g_set_error_literal (error, G_IO_ERROR, G_IO_ERROR_NOT_INITIALIZED,
312 _("Invalid socket, not initialized"));
316 if (socket->priv->construct_error)
318 g_set_error (error, G_IO_ERROR, G_IO_ERROR_NOT_INITIALIZED,
319 _("Invalid socket, initialization failed due to: %s"),
320 socket->priv->construct_error->message);
324 if (socket->priv->closed)
326 g_set_error_literal (error, G_IO_ERROR, G_IO_ERROR_CLOSED,
327 _("Socket is already closed"));
335 check_timeout (GSocket *socket,
338 if (socket->priv->timed_out)
340 socket->priv->timed_out = FALSE;
341 g_set_error_literal (error, G_IO_ERROR, G_IO_ERROR_TIMED_OUT,
342 _("Socket I/O timed out"));
350 g_socket_details_from_fd (GSocket *socket)
352 struct sockaddr_storage address;
358 fd = socket->priv->fd;
359 if (!g_socket_get_option (socket, SOL_SOCKET, SO_TYPE, &value, NULL))
361 errsv = get_socket_errno ();
373 /* programmer error */
374 g_error ("creating GSocket from fd %d: %s\n",
375 fd, socket_strerror (errsv));
386 socket->priv->type = G_SOCKET_TYPE_STREAM;
390 socket->priv->type = G_SOCKET_TYPE_DATAGRAM;
394 socket->priv->type = G_SOCKET_TYPE_SEQPACKET;
398 socket->priv->type = G_SOCKET_TYPE_INVALID;
402 addrlen = sizeof address;
403 if (getsockname (fd, (struct sockaddr *) &address, &addrlen) != 0)
405 errsv = get_socket_errno ();
411 g_assert (G_STRUCT_OFFSET (struct sockaddr, sa_family) +
412 sizeof address.ss_family <= addrlen);
413 family = address.ss_family;
417 /* On Solaris, this happens if the socket is not yet connected.
418 * But we can use SO_DOMAIN as a workaround there.
421 if (!g_socket_get_option (socket, SOL_SOCKET, SO_DOMAIN, &family, NULL))
423 errsv = get_socket_errno ();
427 /* This will translate to G_IO_ERROR_FAILED on either unix or windows */
435 case G_SOCKET_FAMILY_IPV4:
436 case G_SOCKET_FAMILY_IPV6:
437 socket->priv->family = address.ss_family;
438 switch (socket->priv->type)
440 case G_SOCKET_TYPE_STREAM:
441 socket->priv->protocol = G_SOCKET_PROTOCOL_TCP;
444 case G_SOCKET_TYPE_DATAGRAM:
445 socket->priv->protocol = G_SOCKET_PROTOCOL_UDP;
448 case G_SOCKET_TYPE_SEQPACKET:
449 socket->priv->protocol = G_SOCKET_PROTOCOL_SCTP;
457 case G_SOCKET_FAMILY_UNIX:
458 socket->priv->family = G_SOCKET_FAMILY_UNIX;
459 socket->priv->protocol = G_SOCKET_PROTOCOL_DEFAULT;
463 socket->priv->family = G_SOCKET_FAMILY_INVALID;
467 if (socket->priv->family != G_SOCKET_FAMILY_INVALID)
469 addrlen = sizeof address;
470 if (getpeername (fd, (struct sockaddr *) &address, &addrlen) >= 0)
471 socket->priv->connected = TRUE;
474 if (g_socket_get_option (socket, SOL_SOCKET, SO_KEEPALIVE, &value, NULL))
476 socket->priv->keepalive = !!value;
480 /* Can't read, maybe not supported, assume FALSE */
481 socket->priv->keepalive = FALSE;
487 g_set_error (&socket->priv->construct_error, G_IO_ERROR,
488 socket_io_error_from_errno (errsv),
489 _("creating GSocket from fd: %s"),
490 socket_strerror (errsv));
493 /* Wrapper around socket() that is shared with gnetworkmonitornetlink.c */
495 g_socket (gint domain,
503 fd = socket (domain, type | SOCK_CLOEXEC, protocol);
507 /* It's possible that libc has SOCK_CLOEXEC but the kernel does not */
508 if (fd < 0 && (errno == EINVAL || errno == EPROTOTYPE))
510 fd = socket (domain, type, protocol);
514 int errsv = get_socket_errno ();
516 g_set_error (error, G_IO_ERROR, socket_io_error_from_errno (errsv),
517 _("Unable to create socket: %s"), socket_strerror (errsv));
526 /* We always want to set close-on-exec to protect users. If you
527 need to so some weird inheritance to exec you can re-enable this
528 using lower level hacks with g_socket_get_fd(). */
529 flags = fcntl (fd, F_GETFD, 0);
531 (flags & FD_CLOEXEC) == 0)
534 fcntl (fd, F_SETFD, flags);
543 g_socket_create_socket (GSocketFamily family,
552 case G_SOCKET_TYPE_STREAM:
553 native_type = SOCK_STREAM;
556 case G_SOCKET_TYPE_DATAGRAM:
557 native_type = SOCK_DGRAM;
560 case G_SOCKET_TYPE_SEQPACKET:
561 native_type = SOCK_SEQPACKET;
565 g_assert_not_reached ();
570 g_set_error (error, G_IO_ERROR, G_IO_ERROR_INVALID_ARGUMENT,
571 _("Unable to create socket: %s"), _("Unknown family was specified"));
577 g_set_error (error, G_IO_ERROR, G_IO_ERROR_INVALID_ARGUMENT,
578 _("Unable to create socket: %s"), _("Unknown protocol was specified"));
582 return g_socket (family, native_type, protocol, error);
586 g_socket_constructed (GObject *object)
588 GSocket *socket = G_SOCKET (object);
590 if (socket->priv->fd >= 0)
591 /* create socket->priv info from the fd */
592 g_socket_details_from_fd (socket);
595 /* create the fd from socket->priv info */
596 socket->priv->fd = g_socket_create_socket (socket->priv->family,
598 socket->priv->protocol,
599 &socket->priv->construct_error);
601 /* Always use native nonblocking sockets, as
602 windows sets sockets to nonblocking automatically
603 in certain operations. This way we make things work
604 the same on all platforms */
605 if (socket->priv->fd != -1)
606 set_fd_nonblocking (socket->priv->fd);
610 g_socket_get_property (GObject *object,
615 GSocket *socket = G_SOCKET (object);
616 GSocketAddress *address;
621 g_value_set_enum (value, socket->priv->family);
625 g_value_set_enum (value, socket->priv->type);
629 g_value_set_enum (value, socket->priv->protocol);
633 g_value_set_int (value, socket->priv->fd);
637 g_value_set_boolean (value, socket->priv->blocking);
640 case PROP_LISTEN_BACKLOG:
641 g_value_set_int (value, socket->priv->listen_backlog);
645 g_value_set_boolean (value, socket->priv->keepalive);
648 case PROP_LOCAL_ADDRESS:
649 address = g_socket_get_local_address (socket, NULL);
650 g_value_take_object (value, address);
653 case PROP_REMOTE_ADDRESS:
654 address = g_socket_get_remote_address (socket, NULL);
655 g_value_take_object (value, address);
659 g_value_set_uint (value, socket->priv->timeout);
663 g_value_set_uint (value, g_socket_get_ttl (socket));
667 g_value_set_boolean (value, g_socket_get_broadcast (socket));
670 case PROP_MULTICAST_LOOPBACK:
671 g_value_set_boolean (value, g_socket_get_multicast_loopback (socket));
674 case PROP_MULTICAST_TTL:
675 g_value_set_uint (value, g_socket_get_multicast_ttl (socket));
679 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
684 g_socket_set_property (GObject *object,
689 GSocket *socket = G_SOCKET (object);
694 socket->priv->family = g_value_get_enum (value);
698 socket->priv->type = g_value_get_enum (value);
702 socket->priv->protocol = g_value_get_enum (value);
706 socket->priv->fd = g_value_get_int (value);
710 g_socket_set_blocking (socket, g_value_get_boolean (value));
713 case PROP_LISTEN_BACKLOG:
714 g_socket_set_listen_backlog (socket, g_value_get_int (value));
718 g_socket_set_keepalive (socket, g_value_get_boolean (value));
722 g_socket_set_timeout (socket, g_value_get_uint (value));
726 g_socket_set_ttl (socket, g_value_get_uint (value));
730 g_socket_set_broadcast (socket, g_value_get_boolean (value));
733 case PROP_MULTICAST_LOOPBACK:
734 g_socket_set_multicast_loopback (socket, g_value_get_boolean (value));
737 case PROP_MULTICAST_TTL:
738 g_socket_set_multicast_ttl (socket, g_value_get_uint (value));
742 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
747 g_socket_finalize (GObject *object)
749 GSocket *socket = G_SOCKET (object);
752 g_clear_error (&socket->priv->construct_error);
754 if (socket->priv->fd != -1 &&
755 !socket->priv->closed)
756 g_socket_close (socket, NULL);
758 if (socket->priv->remote_address)
759 g_object_unref (socket->priv->remote_address);
762 if (socket->priv->event != WSA_INVALID_EVENT)
764 WSACloseEvent (socket->priv->event);
765 socket->priv->event = WSA_INVALID_EVENT;
768 g_assert (socket->priv->requested_conditions == NULL);
769 g_mutex_clear (&socket->priv->win32_source_lock);
772 for (i = 0; i < RECV_ADDR_CACHE_SIZE; i++)
774 if (socket->priv->recv_addr_cache[i].addr)
776 g_object_unref (socket->priv->recv_addr_cache[i].addr);
777 g_free (socket->priv->recv_addr_cache[i].native);
781 if (G_OBJECT_CLASS (g_socket_parent_class)->finalize)
782 (*G_OBJECT_CLASS (g_socket_parent_class)->finalize) (object);
786 g_socket_class_init (GSocketClass *klass)
788 GObjectClass *gobject_class G_GNUC_UNUSED = G_OBJECT_CLASS (klass);
791 /* There is no portable, thread-safe way to avoid having the process
792 * be killed by SIGPIPE when calling send() or sendmsg(), so we are
793 * forced to simply ignore the signal process-wide.
795 signal (SIGPIPE, SIG_IGN);
798 gobject_class->finalize = g_socket_finalize;
799 gobject_class->constructed = g_socket_constructed;
800 gobject_class->set_property = g_socket_set_property;
801 gobject_class->get_property = g_socket_get_property;
803 g_object_class_install_property (gobject_class, PROP_FAMILY,
804 g_param_spec_enum ("family",
806 P_("The sockets address family"),
807 G_TYPE_SOCKET_FAMILY,
808 G_SOCKET_FAMILY_INVALID,
809 G_PARAM_CONSTRUCT_ONLY |
811 G_PARAM_STATIC_STRINGS));
813 g_object_class_install_property (gobject_class, PROP_TYPE,
814 g_param_spec_enum ("type",
816 P_("The sockets type"),
818 G_SOCKET_TYPE_STREAM,
819 G_PARAM_CONSTRUCT_ONLY |
821 G_PARAM_STATIC_STRINGS));
823 g_object_class_install_property (gobject_class, PROP_PROTOCOL,
824 g_param_spec_enum ("protocol",
825 P_("Socket protocol"),
826 P_("The id of the protocol to use, or -1 for unknown"),
827 G_TYPE_SOCKET_PROTOCOL,
828 G_SOCKET_PROTOCOL_UNKNOWN,
829 G_PARAM_CONSTRUCT_ONLY |
831 G_PARAM_STATIC_STRINGS));
833 g_object_class_install_property (gobject_class, PROP_FD,
834 g_param_spec_int ("fd",
835 P_("File descriptor"),
836 P_("The sockets file descriptor"),
840 G_PARAM_CONSTRUCT_ONLY |
842 G_PARAM_STATIC_STRINGS));
844 g_object_class_install_property (gobject_class, PROP_BLOCKING,
845 g_param_spec_boolean ("blocking",
847 P_("Whether or not I/O on this socket is blocking"),
850 G_PARAM_STATIC_STRINGS));
852 g_object_class_install_property (gobject_class, PROP_LISTEN_BACKLOG,
853 g_param_spec_int ("listen-backlog",
854 P_("Listen backlog"),
855 P_("Outstanding connections in the listen queue"),
860 G_PARAM_STATIC_STRINGS));
862 g_object_class_install_property (gobject_class, PROP_KEEPALIVE,
863 g_param_spec_boolean ("keepalive",
864 P_("Keep connection alive"),
865 P_("Keep connection alive by sending periodic pings"),
868 G_PARAM_STATIC_STRINGS));
870 g_object_class_install_property (gobject_class, PROP_LOCAL_ADDRESS,
871 g_param_spec_object ("local-address",
873 P_("The local address the socket is bound to"),
874 G_TYPE_SOCKET_ADDRESS,
876 G_PARAM_STATIC_STRINGS));
878 g_object_class_install_property (gobject_class, PROP_REMOTE_ADDRESS,
879 g_param_spec_object ("remote-address",
880 P_("Remote address"),
881 P_("The remote address the socket is connected to"),
882 G_TYPE_SOCKET_ADDRESS,
884 G_PARAM_STATIC_STRINGS));
889 * The timeout in seconds on socket I/O
893 g_object_class_install_property (gobject_class, PROP_TIMEOUT,
894 g_param_spec_uint ("timeout",
896 P_("The timeout in seconds on socket I/O"),
901 G_PARAM_STATIC_STRINGS));
906 * Whether the socket should allow sending to broadcast addresses.
910 g_object_class_install_property (gobject_class, PROP_BROADCAST,
911 g_param_spec_boolean ("broadcast",
913 P_("Whether to allow sending to broadcast addresses"),
916 G_PARAM_STATIC_STRINGS));
921 * Time-to-live for outgoing unicast packets
925 g_object_class_install_property (gobject_class, PROP_TTL,
926 g_param_spec_uint ("ttl",
928 P_("Time-to-live of outgoing unicast packets"),
931 G_PARAM_STATIC_STRINGS));
934 * GSocket:multicast-loopback:
936 * Whether outgoing multicast packets loop back to the local host.
940 g_object_class_install_property (gobject_class, PROP_MULTICAST_LOOPBACK,
941 g_param_spec_boolean ("multicast-loopback",
942 P_("Multicast loopback"),
943 P_("Whether outgoing multicast packets loop back to the local host"),
946 G_PARAM_STATIC_STRINGS));
949 * GSocket:multicast-ttl:
951 * Time-to-live out outgoing multicast packets
955 g_object_class_install_property (gobject_class, PROP_MULTICAST_TTL,
956 g_param_spec_uint ("multicast-ttl",
958 P_("Time-to-live of outgoing multicast packets"),
961 G_PARAM_STATIC_STRINGS));
965 g_socket_initable_iface_init (GInitableIface *iface)
967 iface->init = g_socket_initable_init;
971 g_socket_init (GSocket *socket)
973 socket->priv = g_socket_get_instance_private (socket);
975 socket->priv->fd = -1;
976 socket->priv->blocking = TRUE;
977 socket->priv->listen_backlog = 10;
978 socket->priv->construct_error = NULL;
980 socket->priv->event = WSA_INVALID_EVENT;
981 g_mutex_init (&socket->priv->win32_source_lock);
986 g_socket_initable_init (GInitable *initable,
987 GCancellable *cancellable,
992 g_return_val_if_fail (G_IS_SOCKET (initable), FALSE);
994 socket = G_SOCKET (initable);
996 if (cancellable != NULL)
998 g_set_error_literal (error, G_IO_ERROR, G_IO_ERROR_NOT_SUPPORTED,
999 _("Cancellable initialization not supported"));
1003 socket->priv->inited = TRUE;
1005 if (socket->priv->construct_error)
1008 *error = g_error_copy (socket->priv->construct_error);
1018 * @family: the socket family to use, e.g. %G_SOCKET_FAMILY_IPV4.
1019 * @type: the socket type to use.
1020 * @protocol: the id of the protocol to use, or 0 for default.
1021 * @error: #GError for error reporting, or %NULL to ignore.
1023 * Creates a new #GSocket with the defined family, type and protocol.
1024 * If @protocol is 0 (%G_SOCKET_PROTOCOL_DEFAULT) the default protocol type
1025 * for the family and type is used.
1027 * The @protocol is a family and type specific int that specifies what
1028 * kind of protocol to use. #GSocketProtocol lists several common ones.
1029 * Many families only support one protocol, and use 0 for this, others
1030 * support several and using 0 means to use the default protocol for
1031 * the family and type.
1033 * The protocol id is passed directly to the operating
1034 * system, so you can use protocols not listed in #GSocketProtocol if you
1035 * know the protocol number used for it.
1037 * Returns: a #GSocket or %NULL on error.
1038 * Free the returned object with g_object_unref().
1043 g_socket_new (GSocketFamily family,
1045 GSocketProtocol protocol,
1048 return G_SOCKET (g_initable_new (G_TYPE_SOCKET,
1052 "protocol", protocol,
1057 * g_socket_new_from_fd:
1058 * @fd: a native socket file descriptor.
1059 * @error: #GError for error reporting, or %NULL to ignore.
1061 * Creates a new #GSocket from a native file descriptor
1062 * or winsock SOCKET handle.
1064 * This reads all the settings from the file descriptor so that
1065 * all properties should work. Note that the file descriptor
1066 * will be set to non-blocking mode, independent on the blocking
1067 * mode of the #GSocket.
1069 * Returns: a #GSocket or %NULL on error.
1070 * Free the returned object with g_object_unref().
1075 g_socket_new_from_fd (gint fd,
1078 return G_SOCKET (g_initable_new (G_TYPE_SOCKET,
1085 * g_socket_set_blocking:
1086 * @socket: a #GSocket.
1087 * @blocking: Whether to use blocking I/O or not.
1089 * Sets the blocking mode of the socket. In blocking mode
1090 * all operations block until they succeed or there is an error. In
1091 * non-blocking mode all functions return results immediately or
1092 * with a %G_IO_ERROR_WOULD_BLOCK error.
1094 * All sockets are created in blocking mode. However, note that the
1095 * platform level socket is always non-blocking, and blocking mode
1096 * is a GSocket level feature.
1101 g_socket_set_blocking (GSocket *socket,
1104 g_return_if_fail (G_IS_SOCKET (socket));
1106 blocking = !!blocking;
1108 if (socket->priv->blocking == blocking)
1111 socket->priv->blocking = blocking;
1112 g_object_notify (G_OBJECT (socket), "blocking");
1116 * g_socket_get_blocking:
1117 * @socket: a #GSocket.
1119 * Gets the blocking mode of the socket. For details on blocking I/O,
1120 * see g_socket_set_blocking().
1122 * Returns: %TRUE if blocking I/O is used, %FALSE otherwise.
1127 g_socket_get_blocking (GSocket *socket)
1129 g_return_val_if_fail (G_IS_SOCKET (socket), FALSE);
1131 return socket->priv->blocking;
1135 * g_socket_set_keepalive:
1136 * @socket: a #GSocket.
1137 * @keepalive: Value for the keepalive flag
1139 * Sets or unsets the %SO_KEEPALIVE flag on the underlying socket. When
1140 * this flag is set on a socket, the system will attempt to verify that the
1141 * remote socket endpoint is still present if a sufficiently long period of
1142 * time passes with no data being exchanged. If the system is unable to
1143 * verify the presence of the remote endpoint, it will automatically close
1146 * This option is only functional on certain kinds of sockets. (Notably,
1147 * %G_SOCKET_PROTOCOL_TCP sockets.)
1149 * The exact time between pings is system- and protocol-dependent, but will
1150 * normally be at least two hours. Most commonly, you would set this flag
1151 * on a server socket if you want to allow clients to remain idle for long
1152 * periods of time, but also want to ensure that connections are eventually
1153 * garbage-collected if clients crash or become unreachable.
1158 g_socket_set_keepalive (GSocket *socket,
1161 GError *error = NULL;
1163 g_return_if_fail (G_IS_SOCKET (socket));
1165 keepalive = !!keepalive;
1166 if (socket->priv->keepalive == keepalive)
1169 if (!g_socket_set_option (socket, SOL_SOCKET, SO_KEEPALIVE,
1172 g_warning ("error setting keepalive: %s", error->message);
1173 g_error_free (error);
1177 socket->priv->keepalive = keepalive;
1178 g_object_notify (G_OBJECT (socket), "keepalive");
1182 * g_socket_get_keepalive:
1183 * @socket: a #GSocket.
1185 * Gets the keepalive mode of the socket. For details on this,
1186 * see g_socket_set_keepalive().
1188 * Returns: %TRUE if keepalive is active, %FALSE otherwise.
1193 g_socket_get_keepalive (GSocket *socket)
1195 g_return_val_if_fail (G_IS_SOCKET (socket), FALSE);
1197 return socket->priv->keepalive;
1201 * g_socket_get_listen_backlog:
1202 * @socket: a #GSocket.
1204 * Gets the listen backlog setting of the socket. For details on this,
1205 * see g_socket_set_listen_backlog().
1207 * Returns: the maximum number of pending connections.
1212 g_socket_get_listen_backlog (GSocket *socket)
1214 g_return_val_if_fail (G_IS_SOCKET (socket), 0);
1216 return socket->priv->listen_backlog;
1220 * g_socket_set_listen_backlog:
1221 * @socket: a #GSocket.
1222 * @backlog: the maximum number of pending connections.
1224 * Sets the maximum number of outstanding connections allowed
1225 * when listening on this socket. If more clients than this are
1226 * connecting to the socket and the application is not handling them
1227 * on time then the new connections will be refused.
1229 * Note that this must be called before g_socket_listen() and has no
1230 * effect if called after that.
1235 g_socket_set_listen_backlog (GSocket *socket,
1238 g_return_if_fail (G_IS_SOCKET (socket));
1239 g_return_if_fail (!socket->priv->listening);
1241 if (backlog != socket->priv->listen_backlog)
1243 socket->priv->listen_backlog = backlog;
1244 g_object_notify (G_OBJECT (socket), "listen-backlog");
1249 * g_socket_get_timeout:
1250 * @socket: a #GSocket.
1252 * Gets the timeout setting of the socket. For details on this, see
1253 * g_socket_set_timeout().
1255 * Returns: the timeout in seconds
1260 g_socket_get_timeout (GSocket *socket)
1262 g_return_val_if_fail (G_IS_SOCKET (socket), 0);
1264 return socket->priv->timeout;
1268 * g_socket_set_timeout:
1269 * @socket: a #GSocket.
1270 * @timeout: the timeout for @socket, in seconds, or 0 for none
1272 * Sets the time in seconds after which I/O operations on @socket will
1273 * time out if they have not yet completed.
1275 * On a blocking socket, this means that any blocking #GSocket
1276 * operation will time out after @timeout seconds of inactivity,
1277 * returning %G_IO_ERROR_TIMED_OUT.
1279 * On a non-blocking socket, calls to g_socket_condition_wait() will
1280 * also fail with %G_IO_ERROR_TIMED_OUT after the given time. Sources
1281 * created with g_socket_create_source() will trigger after
1282 * @timeout seconds of inactivity, with the requested condition
1283 * set, at which point calling g_socket_receive(), g_socket_send(),
1284 * g_socket_check_connect_result(), etc, will fail with
1285 * %G_IO_ERROR_TIMED_OUT.
1287 * If @timeout is 0 (the default), operations will never time out
1290 * Note that if an I/O operation is interrupted by a signal, this may
1291 * cause the timeout to be reset.
1296 g_socket_set_timeout (GSocket *socket,
1299 g_return_if_fail (G_IS_SOCKET (socket));
1301 if (timeout != socket->priv->timeout)
1303 socket->priv->timeout = timeout;
1304 g_object_notify (G_OBJECT (socket), "timeout");
1310 * @socket: a #GSocket.
1312 * Gets the unicast time-to-live setting on @socket; see
1313 * g_socket_set_ttl() for more details.
1315 * Returns: the time-to-live setting on @socket
1320 g_socket_get_ttl (GSocket *socket)
1322 GError *error = NULL;
1325 g_return_val_if_fail (G_IS_SOCKET (socket), 0);
1327 if (socket->priv->family == G_SOCKET_FAMILY_IPV4)
1329 g_socket_get_option (socket, IPPROTO_IP, IP_TTL,
1332 else if (socket->priv->family == G_SOCKET_FAMILY_IPV6)
1334 g_socket_get_option (socket, IPPROTO_IPV6, IPV6_UNICAST_HOPS,
1338 g_return_val_if_reached (0);
1342 g_warning ("error getting unicast ttl: %s", error->message);
1343 g_error_free (error);
1352 * @socket: a #GSocket.
1353 * @ttl: the time-to-live value for all unicast packets on @socket
1355 * Sets the time-to-live for outgoing unicast packets on @socket.
1356 * By default the platform-specific default value is used.
1361 g_socket_set_ttl (GSocket *socket,
1364 GError *error = NULL;
1366 g_return_if_fail (G_IS_SOCKET (socket));
1368 if (socket->priv->family == G_SOCKET_FAMILY_IPV4)
1370 g_socket_set_option (socket, IPPROTO_IP, IP_TTL,
1373 else if (socket->priv->family == G_SOCKET_FAMILY_IPV6)
1375 g_socket_set_option (socket, IPPROTO_IP, IP_TTL,
1377 g_socket_set_option (socket, IPPROTO_IPV6, IPV6_UNICAST_HOPS,
1381 g_return_if_reached ();
1385 g_warning ("error setting unicast ttl: %s", error->message);
1386 g_error_free (error);
1390 g_object_notify (G_OBJECT (socket), "ttl");
1394 * g_socket_get_broadcast:
1395 * @socket: a #GSocket.
1397 * Gets the broadcast setting on @socket; if %TRUE,
1398 * it is possible to send packets to broadcast
1401 * Returns: the broadcast setting on @socket
1406 g_socket_get_broadcast (GSocket *socket)
1408 GError *error = NULL;
1411 g_return_val_if_fail (G_IS_SOCKET (socket), FALSE);
1413 if (!g_socket_get_option (socket, SOL_SOCKET, SO_BROADCAST,
1416 g_warning ("error getting broadcast: %s", error->message);
1417 g_error_free (error);
1425 * g_socket_set_broadcast:
1426 * @socket: a #GSocket.
1427 * @broadcast: whether @socket should allow sending to broadcast
1430 * Sets whether @socket should allow sending to broadcast addresses.
1431 * This is %FALSE by default.
1436 g_socket_set_broadcast (GSocket *socket,
1439 GError *error = NULL;
1441 g_return_if_fail (G_IS_SOCKET (socket));
1443 broadcast = !!broadcast;
1445 if (!g_socket_set_option (socket, SOL_SOCKET, SO_BROADCAST,
1448 g_warning ("error setting broadcast: %s", error->message);
1449 g_error_free (error);
1453 g_object_notify (G_OBJECT (socket), "broadcast");
1457 * g_socket_get_multicast_loopback:
1458 * @socket: a #GSocket.
1460 * Gets the multicast loopback setting on @socket; if %TRUE (the
1461 * default), outgoing multicast packets will be looped back to
1462 * multicast listeners on the same host.
1464 * Returns: the multicast loopback setting on @socket
1469 g_socket_get_multicast_loopback (GSocket *socket)
1471 GError *error = NULL;
1474 g_return_val_if_fail (G_IS_SOCKET (socket), FALSE);
1476 if (socket->priv->family == G_SOCKET_FAMILY_IPV4)
1478 g_socket_get_option (socket, IPPROTO_IP, IP_MULTICAST_LOOP,
1481 else if (socket->priv->family == G_SOCKET_FAMILY_IPV6)
1483 g_socket_get_option (socket, IPPROTO_IPV6, IPV6_MULTICAST_LOOP,
1487 g_return_val_if_reached (FALSE);
1491 g_warning ("error getting multicast loopback: %s", error->message);
1492 g_error_free (error);
1500 * g_socket_set_multicast_loopback:
1501 * @socket: a #GSocket.
1502 * @loopback: whether @socket should receive messages sent to its
1503 * multicast groups from the local host
1505 * Sets whether outgoing multicast packets will be received by sockets
1506 * listening on that multicast address on the same host. This is %TRUE
1512 g_socket_set_multicast_loopback (GSocket *socket,
1515 GError *error = NULL;
1517 g_return_if_fail (G_IS_SOCKET (socket));
1519 loopback = !!loopback;
1521 if (socket->priv->family == G_SOCKET_FAMILY_IPV4)
1523 g_socket_set_option (socket, IPPROTO_IP, IP_MULTICAST_LOOP,
1526 else if (socket->priv->family == G_SOCKET_FAMILY_IPV6)
1528 g_socket_set_option (socket, IPPROTO_IP, IP_MULTICAST_LOOP,
1530 g_socket_set_option (socket, IPPROTO_IPV6, IPV6_MULTICAST_LOOP,
1534 g_return_if_reached ();
1538 g_warning ("error setting multicast loopback: %s", error->message);
1539 g_error_free (error);
1543 g_object_notify (G_OBJECT (socket), "multicast-loopback");
1547 * g_socket_get_multicast_ttl:
1548 * @socket: a #GSocket.
1550 * Gets the multicast time-to-live setting on @socket; see
1551 * g_socket_set_multicast_ttl() for more details.
1553 * Returns: the multicast time-to-live setting on @socket
1558 g_socket_get_multicast_ttl (GSocket *socket)
1560 GError *error = NULL;
1563 g_return_val_if_fail (G_IS_SOCKET (socket), 0);
1565 if (socket->priv->family == G_SOCKET_FAMILY_IPV4)
1567 g_socket_get_option (socket, IPPROTO_IP, IP_MULTICAST_TTL,
1570 else if (socket->priv->family == G_SOCKET_FAMILY_IPV6)
1572 g_socket_get_option (socket, IPPROTO_IPV6, IPV6_MULTICAST_HOPS,
1576 g_return_val_if_reached (FALSE);
1580 g_warning ("error getting multicast ttl: %s", error->message);
1581 g_error_free (error);
1589 * g_socket_set_multicast_ttl:
1590 * @socket: a #GSocket.
1591 * @ttl: the time-to-live value for all multicast datagrams on @socket
1593 * Sets the time-to-live for outgoing multicast datagrams on @socket.
1594 * By default, this is 1, meaning that multicast packets will not leave
1595 * the local network.
1600 g_socket_set_multicast_ttl (GSocket *socket,
1603 GError *error = NULL;
1605 g_return_if_fail (G_IS_SOCKET (socket));
1607 if (socket->priv->family == G_SOCKET_FAMILY_IPV4)
1609 g_socket_set_option (socket, IPPROTO_IP, IP_MULTICAST_TTL,
1612 else if (socket->priv->family == G_SOCKET_FAMILY_IPV6)
1614 g_socket_set_option (socket, IPPROTO_IP, IP_MULTICAST_TTL,
1616 g_socket_set_option (socket, IPPROTO_IPV6, IPV6_MULTICAST_HOPS,
1620 g_return_if_reached ();
1624 g_warning ("error setting multicast ttl: %s", error->message);
1625 g_error_free (error);
1629 g_object_notify (G_OBJECT (socket), "multicast-ttl");
1633 * g_socket_get_family:
1634 * @socket: a #GSocket.
1636 * Gets the socket family of the socket.
1638 * Returns: a #GSocketFamily
1643 g_socket_get_family (GSocket *socket)
1645 g_return_val_if_fail (G_IS_SOCKET (socket), G_SOCKET_FAMILY_INVALID);
1647 return socket->priv->family;
1651 * g_socket_get_socket_type:
1652 * @socket: a #GSocket.
1654 * Gets the socket type of the socket.
1656 * Returns: a #GSocketType
1661 g_socket_get_socket_type (GSocket *socket)
1663 g_return_val_if_fail (G_IS_SOCKET (socket), G_SOCKET_TYPE_INVALID);
1665 return socket->priv->type;
1669 * g_socket_get_protocol:
1670 * @socket: a #GSocket.
1672 * Gets the socket protocol id the socket was created with.
1673 * In case the protocol is unknown, -1 is returned.
1675 * Returns: a protocol id, or -1 if unknown
1680 g_socket_get_protocol (GSocket *socket)
1682 g_return_val_if_fail (G_IS_SOCKET (socket), -1);
1684 return socket->priv->protocol;
1689 * @socket: a #GSocket.
1691 * Returns the underlying OS socket object. On unix this
1692 * is a socket file descriptor, and on Windows this is
1693 * a Winsock2 SOCKET handle. This may be useful for
1694 * doing platform specific or otherwise unusual operations
1697 * Returns: the file descriptor of the socket.
1702 g_socket_get_fd (GSocket *socket)
1704 g_return_val_if_fail (G_IS_SOCKET (socket), -1);
1706 return socket->priv->fd;
1710 * g_socket_get_local_address:
1711 * @socket: a #GSocket.
1712 * @error: #GError for error reporting, or %NULL to ignore.
1714 * Try to get the local address of a bound socket. This is only
1715 * useful if the socket has been bound to a local address,
1716 * either explicitly or implicitly when connecting.
1718 * Returns: (transfer full): a #GSocketAddress or %NULL on error.
1719 * Free the returned object with g_object_unref().
1724 g_socket_get_local_address (GSocket *socket,
1727 struct sockaddr_storage buffer;
1728 guint len = sizeof (buffer);
1730 g_return_val_if_fail (G_IS_SOCKET (socket), NULL);
1732 if (getsockname (socket->priv->fd, (struct sockaddr *) &buffer, &len) < 0)
1734 int errsv = get_socket_errno ();
1735 g_set_error (error, G_IO_ERROR, socket_io_error_from_errno (errsv),
1736 _("could not get local address: %s"), socket_strerror (errsv));
1740 return g_socket_address_new_from_native (&buffer, len);
1744 * g_socket_get_remote_address:
1745 * @socket: a #GSocket.
1746 * @error: #GError for error reporting, or %NULL to ignore.
1748 * Try to get the remove address of a connected socket. This is only
1749 * useful for connection oriented sockets that have been connected.
1751 * Returns: (transfer full): a #GSocketAddress or %NULL on error.
1752 * Free the returned object with g_object_unref().
1757 g_socket_get_remote_address (GSocket *socket,
1760 struct sockaddr_storage buffer;
1761 guint len = sizeof (buffer);
1763 g_return_val_if_fail (G_IS_SOCKET (socket), NULL);
1765 if (socket->priv->connect_pending)
1767 if (!g_socket_check_connect_result (socket, error))
1770 socket->priv->connect_pending = FALSE;
1773 if (!socket->priv->remote_address)
1775 if (getpeername (socket->priv->fd, (struct sockaddr *) &buffer, &len) < 0)
1777 int errsv = get_socket_errno ();
1778 g_set_error (error, G_IO_ERROR, socket_io_error_from_errno (errsv),
1779 _("could not get remote address: %s"), socket_strerror (errsv));
1783 socket->priv->remote_address = g_socket_address_new_from_native (&buffer, len);
1786 return g_object_ref (socket->priv->remote_address);
1790 * g_socket_is_connected:
1791 * @socket: a #GSocket.
1793 * Check whether the socket is connected. This is only useful for
1794 * connection-oriented sockets.
1796 * Returns: %TRUE if socket is connected, %FALSE otherwise.
1801 g_socket_is_connected (GSocket *socket)
1803 g_return_val_if_fail (G_IS_SOCKET (socket), FALSE);
1805 return socket->priv->connected;
1810 * @socket: a #GSocket.
1811 * @error: #GError for error reporting, or %NULL to ignore.
1813 * Marks the socket as a server socket, i.e. a socket that is used
1814 * to accept incoming requests using g_socket_accept().
1816 * Before calling this the socket must be bound to a local address using
1819 * To set the maximum amount of outstanding clients, use
1820 * g_socket_set_listen_backlog().
1822 * Returns: %TRUE on success, %FALSE on error.
1827 g_socket_listen (GSocket *socket,
1830 g_return_val_if_fail (G_IS_SOCKET (socket), FALSE);
1832 if (!check_socket (socket, error))
1835 if (listen (socket->priv->fd, socket->priv->listen_backlog) < 0)
1837 int errsv = get_socket_errno ();
1839 g_set_error (error, G_IO_ERROR, socket_io_error_from_errno (errsv),
1840 _("could not listen: %s"), socket_strerror (errsv));
1844 socket->priv->listening = TRUE;
1851 * @socket: a #GSocket.
1852 * @address: a #GSocketAddress specifying the local address.
1853 * @allow_reuse: whether to allow reusing this address
1854 * @error: #GError for error reporting, or %NULL to ignore.
1856 * When a socket is created it is attached to an address family, but it
1857 * doesn't have an address in this family. g_socket_bind() assigns the
1858 * address (sometimes called name) of the socket.
1860 * It is generally required to bind to a local address before you can
1861 * receive connections. (See g_socket_listen() and g_socket_accept() ).
1862 * In certain situations, you may also want to bind a socket that will be
1863 * used to initiate connections, though this is not normally required.
1865 * If @socket is a TCP socket, then @allow_reuse controls the setting
1866 * of the `SO_REUSEADDR` socket option; normally it should be %TRUE for
1867 * server sockets (sockets that you will eventually call
1868 * g_socket_accept() on), and %FALSE for client sockets. (Failing to
1869 * set this flag on a server socket may cause g_socket_bind() to return
1870 * %G_IO_ERROR_ADDRESS_IN_USE if the server program is stopped and then
1871 * immediately restarted.)
1873 * If @socket is a UDP socket, then @allow_reuse determines whether or
1874 * not other UDP sockets can be bound to the same address at the same
1875 * time. In particular, you can have several UDP sockets bound to the
1876 * same address, and they will all receive all of the multicast and
1877 * broadcast packets sent to that address. (The behavior of unicast
1878 * UDP packets to an address with multiple listeners is not defined.)
1880 * Returns: %TRUE on success, %FALSE on error.
1885 g_socket_bind (GSocket *socket,
1886 GSocketAddress *address,
1887 gboolean reuse_address,
1890 struct sockaddr_storage addr;
1891 gboolean so_reuseaddr;
1893 gboolean so_reuseport;
1896 g_return_val_if_fail (G_IS_SOCKET (socket) && G_IS_SOCKET_ADDRESS (address), FALSE);
1898 if (!check_socket (socket, error))
1901 if (!g_socket_address_to_native (address, &addr, sizeof addr, error))
1904 /* On Windows, SO_REUSEADDR has the semantics we want for UDP
1905 * sockets, but has nasty side effects we don't want for TCP
1908 * On other platforms, we set SO_REUSEPORT, if it exists, for
1909 * UDP sockets, and SO_REUSEADDR for all sockets, hoping that
1910 * if SO_REUSEPORT doesn't exist, then SO_REUSEADDR will have
1911 * the desired semantics on UDP (as it does on Linux, although
1912 * Linux has SO_REUSEPORT too as of 3.9).
1916 so_reuseaddr = reuse_address && (socket->priv->type == G_SOCKET_TYPE_DATAGRAM);
1918 so_reuseaddr = !!reuse_address;
1922 so_reuseport = reuse_address && (socket->priv->type == G_SOCKET_TYPE_DATAGRAM);
1925 /* Ignore errors here, the only likely error is "not supported", and
1926 * this is a "best effort" thing mainly.
1928 g_socket_set_option (socket, SOL_SOCKET, SO_REUSEADDR, so_reuseaddr, NULL);
1930 g_socket_set_option (socket, SOL_SOCKET, SO_REUSEPORT, so_reuseport, NULL);
1933 if (bind (socket->priv->fd, (struct sockaddr *) &addr,
1934 g_socket_address_get_native_size (address)) < 0)
1936 int errsv = get_socket_errno ();
1938 G_IO_ERROR, socket_io_error_from_errno (errsv),
1939 _("Error binding to address: %s"), socket_strerror (errsv));
1946 #if !defined(HAVE_IF_NAMETOINDEX) && defined(G_OS_WIN32)
1948 if_nametoindex (const gchar *iface)
1950 PIP_ADAPTER_ADDRESSES addresses = NULL, p;
1951 gulong addresses_len = 0;
1955 res = GetAdaptersAddresses (AF_UNSPEC, 0, NULL, NULL, &addresses_len);
1956 if (res != NO_ERROR && res != ERROR_BUFFER_OVERFLOW)
1958 if (res == ERROR_NO_DATA)
1965 addresses = g_malloc (addresses_len);
1966 res = GetAdaptersAddresses (AF_UNSPEC, 0, NULL, addresses, &addresses_len);
1968 if (res != NO_ERROR)
1971 if (res == ERROR_NO_DATA)
1981 if (strcmp (p->AdapterName, iface) == 0)
1997 #define HAVE_IF_NAMETOINDEX 1
2001 g_socket_multicast_group_operation (GSocket *socket,
2002 GInetAddress *group,
2003 gboolean source_specific,
2005 gboolean join_group,
2008 const guint8 *native_addr;
2009 gint optname, result;
2011 g_return_val_if_fail (G_IS_SOCKET (socket), FALSE);
2012 g_return_val_if_fail (socket->priv->type == G_SOCKET_TYPE_DATAGRAM, FALSE);
2013 g_return_val_if_fail (G_IS_INET_ADDRESS (group), FALSE);
2015 if (!check_socket (socket, error))
2018 native_addr = g_inet_address_to_bytes (group);
2019 if (g_inet_address_get_family (group) == G_SOCKET_FAMILY_IPV4)
2021 #ifdef HAVE_IP_MREQN
2022 struct ip_mreqn mc_req;
2024 struct ip_mreq mc_req;
2027 memset (&mc_req, 0, sizeof (mc_req));
2028 memcpy (&mc_req.imr_multiaddr, native_addr, sizeof (struct in_addr));
2030 #ifdef HAVE_IP_MREQN
2032 mc_req.imr_ifindex = if_nametoindex (iface);
2034 mc_req.imr_ifindex = 0; /* Pick any. */
2035 #elif defined(G_OS_WIN32)
2037 mc_req.imr_interface.s_addr = g_htonl (if_nametoindex (iface));
2039 mc_req.imr_interface.s_addr = g_htonl (INADDR_ANY);
2041 mc_req.imr_interface.s_addr = g_htonl (INADDR_ANY);
2044 if (source_specific)
2046 #ifdef IP_ADD_SOURCE_MEMBERSHIP
2047 optname = join_group ? IP_ADD_SOURCE_MEMBERSHIP : IP_DROP_SOURCE_MEMBERSHIP;
2049 g_set_error (error, G_IO_ERROR, G_IO_ERROR_NOT_SUPPORTED,
2051 _("Error joining multicast group: %s") :
2052 _("Error leaving multicast group: %s"),
2053 _("No support for source-specific multicast"));
2058 optname = join_group ? IP_ADD_MEMBERSHIP : IP_DROP_MEMBERSHIP;
2059 result = setsockopt (socket->priv->fd, IPPROTO_IP, optname,
2060 &mc_req, sizeof (mc_req));
2062 else if (g_inet_address_get_family (group) == G_SOCKET_FAMILY_IPV6)
2064 struct ipv6_mreq mc_req_ipv6;
2066 memset (&mc_req_ipv6, 0, sizeof (mc_req_ipv6));
2067 memcpy (&mc_req_ipv6.ipv6mr_multiaddr, native_addr, sizeof (struct in6_addr));
2068 #ifdef HAVE_IF_NAMETOINDEX
2070 mc_req_ipv6.ipv6mr_interface = if_nametoindex (iface);
2073 mc_req_ipv6.ipv6mr_interface = 0;
2075 optname = join_group ? IPV6_JOIN_GROUP : IPV6_LEAVE_GROUP;
2076 result = setsockopt (socket->priv->fd, IPPROTO_IPV6, optname,
2077 &mc_req_ipv6, sizeof (mc_req_ipv6));
2080 g_return_val_if_reached (FALSE);
2084 int errsv = get_socket_errno ();
2086 g_set_error (error, G_IO_ERROR, socket_io_error_from_errno (errsv),
2088 _("Error joining multicast group: %s") :
2089 _("Error leaving multicast group: %s"),
2090 socket_strerror (errsv));
2098 * g_socket_join_multicast_group:
2099 * @socket: a #GSocket.
2100 * @group: a #GInetAddress specifying the group address to join.
2101 * @iface: (allow-none): Name of the interface to use, or %NULL
2102 * @source_specific: %TRUE if source-specific multicast should be used
2103 * @error: #GError for error reporting, or %NULL to ignore.
2105 * Registers @socket to receive multicast messages sent to @group.
2106 * @socket must be a %G_SOCKET_TYPE_DATAGRAM socket, and must have
2107 * been bound to an appropriate interface and port with
2110 * If @iface is %NULL, the system will automatically pick an interface
2111 * to bind to based on @group.
2113 * If @source_specific is %TRUE, source-specific multicast as defined
2114 * in RFC 4604 is used. Note that on older platforms this may fail
2115 * with a %G_IO_ERROR_NOT_SUPPORTED error.
2117 * Returns: %TRUE on success, %FALSE on error.
2122 g_socket_join_multicast_group (GSocket *socket,
2123 GInetAddress *group,
2124 gboolean source_specific,
2128 return g_socket_multicast_group_operation (socket, group, source_specific, iface, TRUE, error);
2132 * g_socket_leave_multicast_group:
2133 * @socket: a #GSocket.
2134 * @group: a #GInetAddress specifying the group address to leave.
2135 * @iface: (allow-none): Interface used
2136 * @source_specific: %TRUE if source-specific multicast was used
2137 * @error: #GError for error reporting, or %NULL to ignore.
2139 * Removes @socket from the multicast group defined by @group, @iface,
2140 * and @source_specific (which must all have the same values they had
2141 * when you joined the group).
2143 * @socket remains bound to its address and port, and can still receive
2144 * unicast messages after calling this.
2146 * Returns: %TRUE on success, %FALSE on error.
2151 g_socket_leave_multicast_group (GSocket *socket,
2152 GInetAddress *group,
2153 gboolean source_specific,
2157 return g_socket_multicast_group_operation (socket, group, source_specific, iface, FALSE, error);
2161 * g_socket_speaks_ipv4:
2162 * @socket: a #GSocket
2164 * Checks if a socket is capable of speaking IPv4.
2166 * IPv4 sockets are capable of speaking IPv4. On some operating systems
2167 * and under some combinations of circumstances IPv6 sockets are also
2168 * capable of speaking IPv4. See RFC 3493 section 3.7 for more
2171 * No other types of sockets are currently considered as being capable
2174 * Returns: %TRUE if this socket can be used with IPv4.
2179 g_socket_speaks_ipv4 (GSocket *socket)
2181 switch (socket->priv->family)
2183 case G_SOCKET_FAMILY_IPV4:
2186 case G_SOCKET_FAMILY_IPV6:
2187 #if defined (IPPROTO_IPV6) && defined (IPV6_V6ONLY)
2191 if (!g_socket_get_option (socket,
2192 IPPROTO_IPV6, IPV6_V6ONLY,
2209 * @socket: a #GSocket.
2210 * @cancellable: (allow-none): a %GCancellable or %NULL
2211 * @error: #GError for error reporting, or %NULL to ignore.
2213 * Accept incoming connections on a connection-based socket. This removes
2214 * the first outstanding connection request from the listening socket and
2215 * creates a #GSocket object for it.
2217 * The @socket must be bound to a local address with g_socket_bind() and
2218 * must be listening for incoming connections (g_socket_listen()).
2220 * If there are no outstanding connections then the operation will block
2221 * or return %G_IO_ERROR_WOULD_BLOCK if non-blocking I/O is enabled.
2222 * To be notified of an incoming connection, wait for the %G_IO_IN condition.
2224 * Returns: (transfer full): a new #GSocket, or %NULL on error.
2225 * Free the returned object with g_object_unref().
2230 g_socket_accept (GSocket *socket,
2231 GCancellable *cancellable,
2234 GSocket *new_socket;
2237 g_return_val_if_fail (G_IS_SOCKET (socket), NULL);
2239 if (!check_socket (socket, error))
2242 if (!check_timeout (socket, error))
2247 if (socket->priv->blocking &&
2248 !g_socket_condition_wait (socket,
2249 G_IO_IN, cancellable, error))
2252 if ((ret = accept (socket->priv->fd, NULL, 0)) < 0)
2254 int errsv = get_socket_errno ();
2256 win32_unset_event_mask (socket, FD_ACCEPT);
2261 if (socket->priv->blocking)
2263 #ifdef WSAEWOULDBLOCK
2264 if (errsv == WSAEWOULDBLOCK)
2267 if (errsv == EWOULDBLOCK ||
2273 g_set_error (error, G_IO_ERROR,
2274 socket_io_error_from_errno (errsv),
2275 _("Error accepting connection: %s"), socket_strerror (errsv));
2281 win32_unset_event_mask (socket, FD_ACCEPT);
2285 /* The socket inherits the accepting sockets event mask and even object,
2286 we need to remove that */
2287 WSAEventSelect (ret, NULL, 0);
2293 /* We always want to set close-on-exec to protect users. If you
2294 need to so some weird inheritance to exec you can re-enable this
2295 using lower level hacks with g_socket_get_fd(). */
2296 flags = fcntl (ret, F_GETFD, 0);
2298 (flags & FD_CLOEXEC) == 0)
2300 flags |= FD_CLOEXEC;
2301 fcntl (ret, F_SETFD, flags);
2306 new_socket = g_socket_new_from_fd (ret, error);
2307 if (new_socket == NULL)
2316 new_socket->priv->protocol = socket->priv->protocol;
2323 * @socket: a #GSocket.
2324 * @address: a #GSocketAddress specifying the remote address.
2325 * @cancellable: (allow-none): a %GCancellable or %NULL
2326 * @error: #GError for error reporting, or %NULL to ignore.
2328 * Connect the socket to the specified remote address.
2330 * For connection oriented socket this generally means we attempt to make
2331 * a connection to the @address. For a connection-less socket it sets
2332 * the default address for g_socket_send() and discards all incoming datagrams
2333 * from other sources.
2335 * Generally connection oriented sockets can only connect once, but
2336 * connection-less sockets can connect multiple times to change the
2339 * If the connect call needs to do network I/O it will block, unless
2340 * non-blocking I/O is enabled. Then %G_IO_ERROR_PENDING is returned
2341 * and the user can be notified of the connection finishing by waiting
2342 * for the G_IO_OUT condition. The result of the connection must then be
2343 * checked with g_socket_check_connect_result().
2345 * Returns: %TRUE if connected, %FALSE on error.
2350 g_socket_connect (GSocket *socket,
2351 GSocketAddress *address,
2352 GCancellable *cancellable,
2355 struct sockaddr_storage buffer;
2357 g_return_val_if_fail (G_IS_SOCKET (socket) && G_IS_SOCKET_ADDRESS (address), FALSE);
2359 if (!check_socket (socket, error))
2362 if (!g_socket_address_to_native (address, &buffer, sizeof buffer, error))
2365 if (socket->priv->remote_address)
2366 g_object_unref (socket->priv->remote_address);
2367 socket->priv->remote_address = g_object_ref (address);
2371 if (connect (socket->priv->fd, (struct sockaddr *) &buffer,
2372 g_socket_address_get_native_size (address)) < 0)
2374 int errsv = get_socket_errno ();
2380 if (errsv == EINPROGRESS)
2382 if (errsv == WSAEWOULDBLOCK)
2385 if (socket->priv->blocking)
2387 if (g_socket_condition_wait (socket, G_IO_OUT, cancellable, error))
2389 if (g_socket_check_connect_result (socket, error))
2395 g_set_error_literal (error, G_IO_ERROR, G_IO_ERROR_PENDING,
2396 _("Connection in progress"));
2397 socket->priv->connect_pending = TRUE;
2401 g_set_error_literal (error, G_IO_ERROR,
2402 socket_io_error_from_errno (errsv),
2403 socket_strerror (errsv));
2410 win32_unset_event_mask (socket, FD_CONNECT);
2412 socket->priv->connected = TRUE;
2418 * g_socket_check_connect_result:
2419 * @socket: a #GSocket
2420 * @error: #GError for error reporting, or %NULL to ignore.
2422 * Checks and resets the pending connect error for the socket.
2423 * This is used to check for errors when g_socket_connect() is
2424 * used in non-blocking mode.
2426 * Returns: %TRUE if no error, %FALSE otherwise, setting @error to the error
2431 g_socket_check_connect_result (GSocket *socket,
2436 g_return_val_if_fail (G_IS_SOCKET (socket), FALSE);
2438 if (!check_socket (socket, error))
2441 if (!check_timeout (socket, error))
2444 if (!g_socket_get_option (socket, SOL_SOCKET, SO_ERROR, &value, error))
2446 g_prefix_error (error, _("Unable to get pending error: "));
2452 g_set_error_literal (error, G_IO_ERROR, socket_io_error_from_errno (value),
2453 socket_strerror (value));
2454 if (socket->priv->remote_address)
2456 g_object_unref (socket->priv->remote_address);
2457 socket->priv->remote_address = NULL;
2462 socket->priv->connected = TRUE;
2467 * g_socket_get_available_bytes:
2468 * @socket: a #GSocket
2470 * Get the amount of data pending in the OS input buffer.
2472 * If @socket is a UDP or SCTP socket, this will return the size of
2473 * just the next packet, even if additional packets are buffered after
2476 * Note that on Windows, this function is rather inefficient in the
2477 * UDP case, and so if you know any plausible upper bound on the size
2478 * of the incoming packet, it is better to just do a
2479 * g_socket_receive() with a buffer of that size, rather than calling
2480 * g_socket_get_available_bytes() first and then doing a receive of
2481 * exactly the right size.
2483 * Returns: the number of bytes that can be read from the socket
2484 * without blocking or truncating, or -1 on error.
2489 g_socket_get_available_bytes (GSocket *socket)
2492 const gint bufsize = 64 * 1024;
2493 static guchar *buf = NULL;
2499 g_return_val_if_fail (G_IS_SOCKET (socket), -1);
2501 #if defined (SO_NREAD)
2502 if (!g_socket_get_option (socket, SOL_SOCKET, SO_NREAD, &avail, NULL))
2504 #elif !defined (G_OS_WIN32)
2505 if (ioctl (socket->priv->fd, FIONREAD, &avail) < 0)
2508 if (socket->priv->type == G_SOCKET_TYPE_DATAGRAM)
2510 if (G_UNLIKELY (g_once_init_enter (&buf)))
2511 g_once_init_leave (&buf, g_malloc (bufsize));
2513 avail = recv (socket->priv->fd, buf, bufsize, MSG_PEEK);
2514 if (avail == -1 && get_socket_errno () == WSAEWOULDBLOCK)
2519 if (ioctlsocket (socket->priv->fd, FIONREAD, &avail) < 0)
2529 * @socket: a #GSocket
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. This is mainly used by
2537 * connection-oriented sockets; it is identical to g_socket_receive_from()
2538 * with @address set to %NULL.
2540 * For %G_SOCKET_TYPE_DATAGRAM and %G_SOCKET_TYPE_SEQPACKET sockets,
2541 * g_socket_receive() will always read either 0 or 1 complete messages from
2542 * the socket. If the received message is too large to fit in @buffer, then
2543 * the data beyond @size bytes will be discarded, without any explicit
2544 * indication that this has occurred.
2546 * For %G_SOCKET_TYPE_STREAM sockets, g_socket_receive() can return any
2547 * number of bytes, up to @size. If more than @size bytes have been
2548 * received, the additional data will be returned in future calls to
2549 * g_socket_receive().
2551 * If the socket is in blocking mode the call will block until there
2552 * is some data to receive, the connection is closed, or there is an
2553 * error. If there is no data available and the socket is in
2554 * non-blocking mode, a %G_IO_ERROR_WOULD_BLOCK error will be
2555 * returned. To be notified when data is available, wait for the
2556 * %G_IO_IN condition.
2558 * On error -1 is returned and @error is set accordingly.
2560 * Returns: Number of bytes read, or 0 if the connection was closed by
2561 * the peer, or -1 on error
2566 g_socket_receive (GSocket *socket,
2569 GCancellable *cancellable,
2572 return g_socket_receive_with_blocking (socket, buffer, size,
2573 socket->priv->blocking,
2574 cancellable, error);
2578 * g_socket_receive_with_blocking:
2579 * @socket: a #GSocket
2580 * @buffer: (array length=size) (element-type guint8): a buffer to
2581 * read data into (which should be at least @size bytes long).
2582 * @size: the number of bytes you want to read from the socket
2583 * @blocking: whether to do blocking or non-blocking I/O
2584 * @cancellable: (allow-none): a %GCancellable or %NULL
2585 * @error: #GError for error reporting, or %NULL to ignore.
2587 * This behaves exactly the same as g_socket_receive(), except that
2588 * the choice of blocking or non-blocking behavior is determined by
2589 * the @blocking argument rather than by @socket's properties.
2591 * Returns: Number of bytes read, or 0 if the connection was closed by
2592 * the peer, or -1 on error
2597 g_socket_receive_with_blocking (GSocket *socket,
2601 GCancellable *cancellable,
2606 g_return_val_if_fail (G_IS_SOCKET (socket) && buffer != NULL, -1);
2608 if (!check_socket (socket, error))
2611 if (!check_timeout (socket, error))
2614 if (g_cancellable_set_error_if_cancelled (cancellable, error))
2620 !g_socket_condition_wait (socket,
2621 G_IO_IN, cancellable, error))
2624 if ((ret = recv (socket->priv->fd, buffer, size, 0)) < 0)
2626 int errsv = get_socket_errno ();
2633 #ifdef WSAEWOULDBLOCK
2634 if (errsv == WSAEWOULDBLOCK)
2637 if (errsv == EWOULDBLOCK ||
2643 win32_unset_event_mask (socket, FD_READ);
2645 g_set_error (error, G_IO_ERROR,
2646 socket_io_error_from_errno (errsv),
2647 _("Error receiving data: %s"), socket_strerror (errsv));
2651 win32_unset_event_mask (socket, FD_READ);
2660 * g_socket_receive_from:
2661 * @socket: a #GSocket
2662 * @address: (out) (allow-none): a pointer to a #GSocketAddress
2664 * @buffer: (array length=size) (element-type guint8): a buffer to
2665 * read data into (which should be at least @size bytes long).
2666 * @size: the number of bytes you want to read from the socket
2667 * @cancellable: (allow-none): a %GCancellable or %NULL
2668 * @error: #GError for error reporting, or %NULL to ignore.
2670 * Receive data (up to @size bytes) from a socket.
2672 * If @address is non-%NULL then @address will be set equal to the
2673 * source address of the received packet.
2674 * @address is owned by the caller.
2676 * See g_socket_receive() for additional information.
2678 * Returns: Number of bytes read, or 0 if the connection was closed by
2679 * the peer, or -1 on error
2684 g_socket_receive_from (GSocket *socket,
2685 GSocketAddress **address,
2688 GCancellable *cancellable,
2696 return g_socket_receive_message (socket,
2704 /* Although we ignore SIGPIPE, gdb will still stop if the app receives
2705 * one, which can be confusing and annoying. So if possible, we want
2706 * to suppress the signal entirely.
2709 #define G_SOCKET_DEFAULT_SEND_FLAGS MSG_NOSIGNAL
2711 #define G_SOCKET_DEFAULT_SEND_FLAGS 0
2716 * @socket: a #GSocket
2717 * @buffer: (array length=size) (element-type guint8): the buffer
2718 * containing the data to send.
2719 * @size: the number of bytes to send
2720 * @cancellable: (allow-none): a %GCancellable or %NULL
2721 * @error: #GError for error reporting, or %NULL to ignore.
2723 * Tries to send @size bytes from @buffer on the socket. This is
2724 * mainly used by connection-oriented sockets; it is identical to
2725 * g_socket_send_to() with @address set to %NULL.
2727 * If the socket is in blocking mode the call will block until there is
2728 * space for the data in the socket queue. If there is no space available
2729 * and the socket is in non-blocking mode a %G_IO_ERROR_WOULD_BLOCK error
2730 * will be returned. To be notified when space is available, wait for the
2731 * %G_IO_OUT condition. Note though that you may still receive
2732 * %G_IO_ERROR_WOULD_BLOCK from g_socket_send() even if you were previously
2733 * notified of a %G_IO_OUT condition. (On Windows in particular, this is
2734 * very common due to the way the underlying APIs work.)
2736 * On error -1 is returned and @error is set accordingly.
2738 * Returns: Number of bytes written (which may be less than @size), or -1
2744 g_socket_send (GSocket *socket,
2745 const gchar *buffer,
2747 GCancellable *cancellable,
2750 return g_socket_send_with_blocking (socket, buffer, size,
2751 socket->priv->blocking,
2752 cancellable, error);
2756 * g_socket_send_with_blocking:
2757 * @socket: a #GSocket
2758 * @buffer: (array length=size) (element-type guint8): the buffer
2759 * containing the data to send.
2760 * @size: the number of bytes to send
2761 * @blocking: whether to do blocking or non-blocking I/O
2762 * @cancellable: (allow-none): a %GCancellable or %NULL
2763 * @error: #GError for error reporting, or %NULL to ignore.
2765 * This behaves exactly the same as g_socket_send(), except that
2766 * the choice of blocking or non-blocking behavior is determined by
2767 * the @blocking argument rather than by @socket's properties.
2769 * Returns: Number of bytes written (which may be less than @size), or -1
2775 g_socket_send_with_blocking (GSocket *socket,
2776 const gchar *buffer,
2779 GCancellable *cancellable,
2784 g_return_val_if_fail (G_IS_SOCKET (socket) && buffer != NULL, -1);
2786 if (!check_socket (socket, error))
2789 if (!check_timeout (socket, error))
2792 if (g_cancellable_set_error_if_cancelled (cancellable, error))
2798 !g_socket_condition_wait (socket,
2799 G_IO_OUT, cancellable, error))
2802 if ((ret = send (socket->priv->fd, buffer, size, G_SOCKET_DEFAULT_SEND_FLAGS)) < 0)
2804 int errsv = get_socket_errno ();
2809 #ifdef WSAEWOULDBLOCK
2810 if (errsv == WSAEWOULDBLOCK)
2811 win32_unset_event_mask (socket, FD_WRITE);
2816 #ifdef WSAEWOULDBLOCK
2817 if (errsv == WSAEWOULDBLOCK)
2820 if (errsv == EWOULDBLOCK ||
2826 g_set_error (error, G_IO_ERROR,
2827 socket_io_error_from_errno (errsv),
2828 _("Error sending data: %s"), socket_strerror (errsv));
2839 * @socket: a #GSocket
2840 * @address: (allow-none): a #GSocketAddress, or %NULL
2841 * @buffer: (array length=size) (element-type guint8): the buffer
2842 * containing the data to send.
2843 * @size: the number of bytes to send
2844 * @cancellable: (allow-none): a %GCancellable or %NULL
2845 * @error: #GError for error reporting, or %NULL to ignore.
2847 * Tries to send @size bytes from @buffer to @address. If @address is
2848 * %NULL then the message is sent to the default receiver (set by
2849 * g_socket_connect()).
2851 * See g_socket_send() for additional information.
2853 * Returns: Number of bytes written (which may be less than @size), or -1
2859 g_socket_send_to (GSocket *socket,
2860 GSocketAddress *address,
2861 const gchar *buffer,
2863 GCancellable *cancellable,
2871 return g_socket_send_message (socket,
2881 * g_socket_shutdown:
2882 * @socket: a #GSocket
2883 * @shutdown_read: whether to shut down the read side
2884 * @shutdown_write: whether to shut down the write side
2885 * @error: #GError for error reporting, or %NULL to ignore.
2887 * Shut down part of a full-duplex connection.
2889 * If @shutdown_read is %TRUE then the receiving side of the connection
2890 * is shut down, and further reading is disallowed.
2892 * If @shutdown_write is %TRUE then the sending side of the connection
2893 * is shut down, and further writing is disallowed.
2895 * It is allowed for both @shutdown_read and @shutdown_write to be %TRUE.
2897 * One example where this is used is graceful disconnect for TCP connections
2898 * where you close the sending side, then wait for the other side to close
2899 * the connection, thus ensuring that the other side saw all sent data.
2901 * Returns: %TRUE on success, %FALSE on error
2906 g_socket_shutdown (GSocket *socket,
2907 gboolean shutdown_read,
2908 gboolean shutdown_write,
2913 g_return_val_if_fail (G_IS_SOCKET (socket), TRUE);
2915 if (!check_socket (socket, error))
2919 if (!shutdown_read && !shutdown_write)
2923 if (shutdown_read && shutdown_write)
2925 else if (shutdown_read)
2930 if (shutdown_read && shutdown_write)
2932 else if (shutdown_read)
2938 if (shutdown (socket->priv->fd, how) != 0)
2940 int errsv = get_socket_errno ();
2941 g_set_error (error, G_IO_ERROR, socket_io_error_from_errno (errsv),
2942 _("Unable to shutdown socket: %s"), socket_strerror (errsv));
2946 if (shutdown_read && shutdown_write)
2947 socket->priv->connected = FALSE;
2954 * @socket: a #GSocket
2955 * @error: #GError for error reporting, or %NULL to ignore.
2957 * Closes the socket, shutting down any active connection.
2959 * Closing a socket does not wait for all outstanding I/O operations
2960 * to finish, so the caller should not rely on them to be guaranteed
2961 * to complete even if the close returns with no error.
2963 * Once the socket is closed, all other operations will return
2964 * %G_IO_ERROR_CLOSED. Closing a socket multiple times will not
2967 * Sockets will be automatically closed when the last reference
2968 * is dropped, but you might want to call this function to make sure
2969 * resources are released as early as possible.
2971 * Beware that due to the way that TCP works, it is possible for
2972 * recently-sent data to be lost if either you close a socket while the
2973 * %G_IO_IN condition is set, or else if the remote connection tries to
2974 * send something to you after you close the socket but before it has
2975 * finished reading all of the data you sent. There is no easy generic
2976 * way to avoid this problem; the easiest fix is to design the network
2977 * protocol such that the client will never send data "out of turn".
2978 * Another solution is for the server to half-close the connection by
2979 * calling g_socket_shutdown() with only the @shutdown_write flag set,
2980 * and then wait for the client to notice this and close its side of the
2981 * connection, after which the server can safely call g_socket_close().
2982 * (This is what #GTcpConnection does if you call
2983 * g_tcp_connection_set_graceful_disconnect(). But of course, this
2984 * only works if the client will close its connection after the server
2987 * Returns: %TRUE on success, %FALSE on error
2992 g_socket_close (GSocket *socket,
2997 g_return_val_if_fail (G_IS_SOCKET (socket), TRUE);
2999 if (socket->priv->closed)
3000 return TRUE; /* Multiple close not an error */
3002 if (!check_socket (socket, error))
3008 res = closesocket (socket->priv->fd);
3010 res = close (socket->priv->fd);
3014 int errsv = get_socket_errno ();
3019 g_set_error (error, G_IO_ERROR,
3020 socket_io_error_from_errno (errsv),
3021 _("Error closing socket: %s"),
3022 socket_strerror (errsv));
3028 socket->priv->connected = FALSE;
3029 socket->priv->closed = TRUE;
3030 if (socket->priv->remote_address)
3032 g_object_unref (socket->priv->remote_address);
3033 socket->priv->remote_address = NULL;
3040 * g_socket_is_closed:
3041 * @socket: a #GSocket
3043 * Checks whether a socket is closed.
3045 * Returns: %TRUE if socket is closed, %FALSE otherwise
3050 g_socket_is_closed (GSocket *socket)
3052 return socket->priv->closed;
3056 /* Broken source, used on errors */
3058 broken_dispatch (GSource *source,
3059 GSourceFunc callback,
3065 static GSourceFuncs broken_funcs =
3074 network_events_for_condition (GIOCondition condition)
3078 if (condition & G_IO_IN)
3079 event_mask |= (FD_READ | FD_ACCEPT);
3080 if (condition & G_IO_OUT)
3081 event_mask |= (FD_WRITE | FD_CONNECT);
3082 event_mask |= FD_CLOSE;
3088 ensure_event (GSocket *socket)
3090 if (socket->priv->event == WSA_INVALID_EVENT)
3091 socket->priv->event = WSACreateEvent();
3095 update_select_events (GSocket *socket)
3102 ensure_event (socket);
3105 for (l = socket->priv->requested_conditions; l != NULL; l = l->next)
3108 event_mask |= network_events_for_condition (*ptr);
3111 if (event_mask != socket->priv->selected_events)
3113 /* If no events selected, disable event so we can unset
3116 if (event_mask == 0)
3119 event = socket->priv->event;
3121 if (WSAEventSelect (socket->priv->fd, event, event_mask) == 0)
3122 socket->priv->selected_events = event_mask;
3127 add_condition_watch (GSocket *socket,
3128 GIOCondition *condition)
3130 g_mutex_lock (&socket->priv->win32_source_lock);
3131 g_assert (g_list_find (socket->priv->requested_conditions, condition) == NULL);
3133 socket->priv->requested_conditions =
3134 g_list_prepend (socket->priv->requested_conditions, condition);
3136 update_select_events (socket);
3137 g_mutex_unlock (&socket->priv->win32_source_lock);
3141 remove_condition_watch (GSocket *socket,
3142 GIOCondition *condition)
3144 g_mutex_lock (&socket->priv->win32_source_lock);
3145 g_assert (g_list_find (socket->priv->requested_conditions, condition) != NULL);
3147 socket->priv->requested_conditions =
3148 g_list_remove (socket->priv->requested_conditions, condition);
3150 update_select_events (socket);
3151 g_mutex_unlock (&socket->priv->win32_source_lock);
3155 update_condition (GSocket *socket)
3157 WSANETWORKEVENTS events;
3158 GIOCondition condition;
3160 if (WSAEnumNetworkEvents (socket->priv->fd,
3161 socket->priv->event,
3164 socket->priv->current_events |= events.lNetworkEvents;
3165 if (events.lNetworkEvents & FD_WRITE &&
3166 events.iErrorCode[FD_WRITE_BIT] != 0)
3167 socket->priv->current_errors |= FD_WRITE;
3168 if (events.lNetworkEvents & FD_CONNECT &&
3169 events.iErrorCode[FD_CONNECT_BIT] != 0)
3170 socket->priv->current_errors |= FD_CONNECT;
3174 if (socket->priv->current_events & (FD_READ | FD_ACCEPT))
3175 condition |= G_IO_IN;
3177 if (socket->priv->current_events & FD_CLOSE)
3179 int r, errsv, buffer;
3181 r = recv (socket->priv->fd, &buffer, sizeof (buffer), MSG_PEEK);
3183 errsv = get_socket_errno ();
3186 (r < 0 && errsv == WSAENOTCONN))
3187 condition |= G_IO_IN;
3189 (r < 0 && (errsv == WSAESHUTDOWN || errsv == WSAECONNRESET ||
3190 errsv == WSAECONNABORTED || errsv == WSAENETRESET)))
3191 condition |= G_IO_HUP;
3193 condition |= G_IO_ERR;
3196 if (socket->priv->closed)
3197 condition |= G_IO_HUP;
3199 /* Never report both G_IO_OUT and HUP, these are
3200 mutually exclusive (can't write to a closed socket) */
3201 if ((condition & G_IO_HUP) == 0 &&
3202 socket->priv->current_events & FD_WRITE)
3204 if (socket->priv->current_errors & FD_WRITE)
3205 condition |= G_IO_ERR;
3207 condition |= G_IO_OUT;
3211 if (socket->priv->current_events & FD_CONNECT)
3213 if (socket->priv->current_errors & FD_CONNECT)
3214 condition |= (G_IO_HUP | G_IO_ERR);
3216 condition |= G_IO_OUT;
3232 GIOCondition condition;
3237 socket_source_prepare_win32 (GSource *source,
3240 GSocketSource *socket_source = (GSocketSource *)source;
3244 return (update_condition (socket_source->socket) & socket_source->condition) != 0;
3248 socket_source_check_win32 (GSource *source)
3252 return socket_source_prepare_win32 (source, &timeout);
3257 socket_source_dispatch (GSource *source,
3258 GSourceFunc callback,
3261 GSocketSourceFunc func = (GSocketSourceFunc)callback;
3262 GSocketSource *socket_source = (GSocketSource *)source;
3263 GSocket *socket = socket_source->socket;
3269 events = update_condition (socket_source->socket);
3271 events = g_source_query_unix_fd (source, socket_source->fd_tag);
3274 timeout = g_source_get_ready_time (source);
3275 if (timeout >= 0 && timeout < g_source_get_time (source))
3277 socket->priv->timed_out = TRUE;
3278 events |= (G_IO_IN | G_IO_OUT);
3281 ret = (*func) (socket, events & socket_source->condition, user_data);
3283 if (socket->priv->timeout)
3284 g_source_set_ready_time (source, g_get_monotonic_time () + socket->priv->timeout * 1000000);
3286 g_source_set_ready_time (source, -1);
3292 socket_source_finalize (GSource *source)
3294 GSocketSource *socket_source = (GSocketSource *)source;
3297 socket = socket_source->socket;
3300 remove_condition_watch (socket, &socket_source->condition);
3303 g_object_unref (socket);
3307 socket_source_closure_callback (GSocket *socket,
3308 GIOCondition condition,
3311 GClosure *closure = data;
3313 GValue params[2] = { G_VALUE_INIT, G_VALUE_INIT };
3314 GValue result_value = G_VALUE_INIT;
3317 g_value_init (&result_value, G_TYPE_BOOLEAN);
3319 g_value_init (¶ms[0], G_TYPE_SOCKET);
3320 g_value_set_object (¶ms[0], socket);
3321 g_value_init (¶ms[1], G_TYPE_IO_CONDITION);
3322 g_value_set_flags (¶ms[1], condition);
3324 g_closure_invoke (closure, &result_value, 2, params, NULL);
3326 result = g_value_get_boolean (&result_value);
3327 g_value_unset (&result_value);
3328 g_value_unset (¶ms[0]);
3329 g_value_unset (¶ms[1]);
3334 static GSourceFuncs socket_source_funcs =
3337 socket_source_prepare_win32,
3338 socket_source_check_win32,
3340 NULL, NULL, /* check, prepare */
3342 socket_source_dispatch,
3343 socket_source_finalize,
3344 (GSourceFunc)socket_source_closure_callback,
3348 socket_source_new (GSocket *socket,
3349 GIOCondition condition,
3350 GCancellable *cancellable)
3353 GSocketSource *socket_source;
3356 ensure_event (socket);
3358 if (socket->priv->event == WSA_INVALID_EVENT)
3360 g_warning ("Failed to create WSAEvent");
3361 return g_source_new (&broken_funcs, sizeof (GSource));
3365 condition |= G_IO_HUP | G_IO_ERR | G_IO_NVAL;
3367 source = g_source_new (&socket_source_funcs, sizeof (GSocketSource));
3368 g_source_set_name (source, "GSocket");
3369 socket_source = (GSocketSource *)source;
3371 socket_source->socket = g_object_ref (socket);
3372 socket_source->condition = condition;
3376 GSource *cancellable_source;
3378 cancellable_source = g_cancellable_source_new (cancellable);
3379 g_source_add_child_source (source, cancellable_source);
3380 g_source_set_dummy_callback (cancellable_source);
3381 g_source_unref (cancellable_source);
3385 add_condition_watch (socket, &socket_source->condition);
3386 socket_source->pollfd.fd = (gintptr) socket->priv->event;
3387 socket_source->pollfd.events = condition;
3388 socket_source->pollfd.revents = 0;
3389 g_source_add_poll (source, &socket_source->pollfd);
3391 socket_source->fd_tag = g_source_add_unix_fd (source, socket->priv->fd, condition);
3394 if (socket->priv->timeout)
3395 g_source_set_ready_time (source, g_get_monotonic_time () + socket->priv->timeout * 1000000);
3397 g_source_set_ready_time (source, -1);
3403 * g_socket_create_source: (skip)
3404 * @socket: a #GSocket
3405 * @condition: a #GIOCondition mask to monitor
3406 * @cancellable: (allow-none): a %GCancellable or %NULL
3408 * Creates a %GSource that can be attached to a %GMainContext to monitor
3409 * for the availability of the specified @condition on the socket.
3411 * The callback on the source is of the #GSocketSourceFunc type.
3413 * It is meaningless to specify %G_IO_ERR or %G_IO_HUP in @condition;
3414 * these conditions will always be reported output if they are true.
3416 * @cancellable if not %NULL can be used to cancel the source, which will
3417 * cause the source to trigger, reporting the current condition (which
3418 * is likely 0 unless cancellation happened at the same time as a
3419 * condition change). You can check for this in the callback using
3420 * g_cancellable_is_cancelled().
3422 * If @socket has a timeout set, and it is reached before @condition
3423 * occurs, the source will then trigger anyway, reporting %G_IO_IN or
3424 * %G_IO_OUT depending on @condition. However, @socket will have been
3425 * marked as having had a timeout, and so the next #GSocket I/O method
3426 * you call will then fail with a %G_IO_ERROR_TIMED_OUT.
3428 * Returns: (transfer full): a newly allocated %GSource, free with g_source_unref().
3433 g_socket_create_source (GSocket *socket,
3434 GIOCondition condition,
3435 GCancellable *cancellable)
3437 g_return_val_if_fail (G_IS_SOCKET (socket) && (cancellable == NULL || G_IS_CANCELLABLE (cancellable)), NULL);
3439 return socket_source_new (socket, condition, cancellable);
3443 * g_socket_condition_check:
3444 * @socket: a #GSocket
3445 * @condition: a #GIOCondition mask to check
3447 * Checks on the readiness of @socket to perform operations.
3448 * The operations specified in @condition are checked for and masked
3449 * against the currently-satisfied conditions on @socket. The result
3452 * Note that on Windows, it is possible for an operation to return
3453 * %G_IO_ERROR_WOULD_BLOCK even immediately after
3454 * g_socket_condition_check() has claimed that the socket is ready for
3455 * writing. Rather than calling g_socket_condition_check() and then
3456 * writing to the socket if it succeeds, it is generally better to
3457 * simply try writing to the socket right away, and try again later if
3458 * the initial attempt returns %G_IO_ERROR_WOULD_BLOCK.
3460 * It is meaningless to specify %G_IO_ERR or %G_IO_HUP in condition;
3461 * these conditions will always be set in the output if they are true.
3463 * This call never blocks.
3465 * Returns: the @GIOCondition mask of the current state
3470 g_socket_condition_check (GSocket *socket,
3471 GIOCondition condition)
3473 g_return_val_if_fail (G_IS_SOCKET (socket), 0);
3475 if (!check_socket (socket, NULL))
3480 GIOCondition current_condition;
3482 condition |= G_IO_ERR | G_IO_HUP;
3484 add_condition_watch (socket, &condition);
3485 current_condition = update_condition (socket);
3486 remove_condition_watch (socket, &condition);
3487 return condition & current_condition;
3493 poll_fd.fd = socket->priv->fd;
3494 poll_fd.events = condition;
3495 poll_fd.revents = 0;
3498 result = g_poll (&poll_fd, 1, 0);
3499 while (result == -1 && get_socket_errno () == EINTR);
3501 return poll_fd.revents;
3507 * g_socket_condition_wait:
3508 * @socket: a #GSocket
3509 * @condition: a #GIOCondition mask to wait for
3510 * @cancellable: (allow-none): a #GCancellable, or %NULL
3511 * @error: a #GError pointer, or %NULL
3513 * Waits for @condition to become true on @socket. When the condition
3514 * is met, %TRUE is returned.
3516 * If @cancellable is cancelled before the condition is met, or if the
3517 * socket has a timeout set and it is reached before the condition is
3518 * met, then %FALSE is returned and @error, if non-%NULL, is set to
3519 * the appropriate value (%G_IO_ERROR_CANCELLED or
3520 * %G_IO_ERROR_TIMED_OUT).
3522 * See also g_socket_condition_timed_wait().
3524 * Returns: %TRUE if the condition was met, %FALSE otherwise
3529 g_socket_condition_wait (GSocket *socket,
3530 GIOCondition condition,
3531 GCancellable *cancellable,
3534 g_return_val_if_fail (G_IS_SOCKET (socket), FALSE);
3536 return g_socket_condition_timed_wait (socket, condition, -1,
3537 cancellable, error);
3541 * g_socket_condition_timed_wait:
3542 * @socket: a #GSocket
3543 * @condition: a #GIOCondition mask to wait for
3544 * @timeout: the maximum time (in microseconds) to wait, or -1
3545 * @cancellable: (allow-none): a #GCancellable, or %NULL
3546 * @error: a #GError pointer, or %NULL
3548 * Waits for up to @timeout microseconds for @condition to become true
3549 * on @socket. If the condition is met, %TRUE is returned.
3551 * If @cancellable is cancelled before the condition is met, or if
3552 * @timeout (or the socket's #GSocket:timeout) is reached before the
3553 * condition is met, then %FALSE is returned and @error, if non-%NULL,
3554 * is set to the appropriate value (%G_IO_ERROR_CANCELLED or
3555 * %G_IO_ERROR_TIMED_OUT).
3557 * If you don't want a timeout, use g_socket_condition_wait().
3558 * (Alternatively, you can pass -1 for @timeout.)
3560 * Note that although @timeout is in microseconds for consistency with
3561 * other GLib APIs, this function actually only has millisecond
3562 * resolution, and the behavior is undefined if @timeout is not an
3563 * exact number of milliseconds.
3565 * Returns: %TRUE if the condition was met, %FALSE otherwise
3570 g_socket_condition_timed_wait (GSocket *socket,
3571 GIOCondition condition,
3573 GCancellable *cancellable,
3578 g_return_val_if_fail (G_IS_SOCKET (socket), FALSE);
3580 if (!check_socket (socket, error))
3583 if (g_cancellable_set_error_if_cancelled (cancellable, error))
3586 if (socket->priv->timeout &&
3587 (timeout < 0 || socket->priv->timeout < timeout / G_USEC_PER_SEC))
3588 timeout = socket->priv->timeout * 1000;
3589 else if (timeout != -1)
3590 timeout = timeout / 1000;
3592 start_time = g_get_monotonic_time ();
3596 GIOCondition current_condition;
3602 /* Always check these */
3603 condition |= G_IO_ERR | G_IO_HUP;
3605 add_condition_watch (socket, &condition);
3608 events[num_events++] = socket->priv->event;
3610 if (g_cancellable_make_pollfd (cancellable, &cancel_fd))
3611 events[num_events++] = (WSAEVENT)cancel_fd.fd;
3614 timeout = WSA_INFINITE;
3616 current_condition = update_condition (socket);
3617 while ((condition & current_condition) == 0)
3619 res = WSAWaitForMultipleEvents (num_events, events,
3620 FALSE, timeout, FALSE);
3621 if (res == WSA_WAIT_FAILED)
3623 int errsv = get_socket_errno ();
3625 g_set_error (error, G_IO_ERROR,
3626 socket_io_error_from_errno (errsv),
3627 _("Waiting for socket condition: %s"),
3628 socket_strerror (errsv));
3631 else if (res == WSA_WAIT_TIMEOUT)
3633 g_set_error_literal (error, G_IO_ERROR, G_IO_ERROR_TIMED_OUT,
3634 _("Socket I/O timed out"));
3638 if (g_cancellable_set_error_if_cancelled (cancellable, error))
3641 current_condition = update_condition (socket);
3643 if (timeout != WSA_INFINITE)
3645 timeout -= (g_get_monotonic_time () - start_time) * 1000;
3650 remove_condition_watch (socket, &condition);
3652 g_cancellable_release_fd (cancellable);
3654 return (condition & current_condition) != 0;
3662 poll_fd[0].fd = socket->priv->fd;
3663 poll_fd[0].events = condition;
3666 if (g_cancellable_make_pollfd (cancellable, &poll_fd[1]))
3671 result = g_poll (poll_fd, num, timeout);
3672 if (result != -1 || errno != EINTR)
3677 timeout -= (g_get_monotonic_time () - start_time) / 1000;
3684 g_cancellable_release_fd (cancellable);
3688 g_set_error_literal (error, G_IO_ERROR, G_IO_ERROR_TIMED_OUT,
3689 _("Socket I/O timed out"));
3693 return !g_cancellable_set_error_if_cancelled (cancellable, error);
3699 * g_socket_send_message:
3700 * @socket: a #GSocket
3701 * @address: (allow-none): a #GSocketAddress, or %NULL
3702 * @vectors: (array length=num_vectors): an array of #GOutputVector structs
3703 * @num_vectors: the number of elements in @vectors, or -1
3704 * @messages: (array length=num_messages) (allow-none): a pointer to an
3705 * array of #GSocketControlMessages, or %NULL.
3706 * @num_messages: number of elements in @messages, or -1.
3707 * @flags: an int containing #GSocketMsgFlags flags
3708 * @cancellable: (allow-none): a %GCancellable or %NULL
3709 * @error: #GError for error reporting, or %NULL to ignore.
3711 * Send data to @address on @socket. This is the most complicated and
3712 * fully-featured version of this call. For easier use, see
3713 * g_socket_send() and g_socket_send_to().
3715 * If @address is %NULL then the message is sent to the default receiver
3716 * (set by g_socket_connect()).
3718 * @vectors must point to an array of #GOutputVector structs and
3719 * @num_vectors must be the length of this array. (If @num_vectors is -1,
3720 * then @vectors is assumed to be terminated by a #GOutputVector with a
3721 * %NULL buffer pointer.) The #GOutputVector structs describe the buffers
3722 * that the sent data will be gathered from. Using multiple
3723 * #GOutputVectors is more memory-efficient than manually copying
3724 * data from multiple sources into a single buffer, and more
3725 * network-efficient than making multiple calls to g_socket_send().
3727 * @messages, if non-%NULL, is taken to point to an array of @num_messages
3728 * #GSocketControlMessage instances. These correspond to the control
3729 * messages to be sent on the socket.
3730 * If @num_messages is -1 then @messages is treated as a %NULL-terminated
3733 * @flags modify how the message is sent. The commonly available arguments
3734 * for this are available in the #GSocketMsgFlags enum, but the
3735 * values there are the same as the system values, and the flags
3736 * are passed in as-is, so you can pass in system-specific flags too.
3738 * If the socket is in blocking mode the call will block until there is
3739 * space for the data in the socket queue. If there is no space available
3740 * and the socket is in non-blocking mode a %G_IO_ERROR_WOULD_BLOCK error
3741 * will be returned. To be notified when space is available, wait for the
3742 * %G_IO_OUT condition. Note though that you may still receive
3743 * %G_IO_ERROR_WOULD_BLOCK from g_socket_send() even if you were previously
3744 * notified of a %G_IO_OUT condition. (On Windows in particular, this is
3745 * very common due to the way the underlying APIs work.)
3747 * On error -1 is returned and @error is set accordingly.
3749 * Returns: Number of bytes written (which may be less than @size), or -1
3755 g_socket_send_message (GSocket *socket,
3756 GSocketAddress *address,
3757 GOutputVector *vectors,
3759 GSocketControlMessage **messages,
3762 GCancellable *cancellable,
3765 GOutputVector one_vector;
3768 g_return_val_if_fail (G_IS_SOCKET (socket), -1);
3770 if (!check_socket (socket, error))
3773 if (!check_timeout (socket, error))
3776 if (g_cancellable_set_error_if_cancelled (cancellable, error))
3779 if (num_vectors == -1)
3781 for (num_vectors = 0;
3782 vectors[num_vectors].buffer != NULL;
3787 if (num_messages == -1)
3789 for (num_messages = 0;
3790 messages != NULL && messages[num_messages] != NULL;
3795 if (num_vectors == 0)
3799 one_vector.buffer = &zero;
3800 one_vector.size = 1;
3802 vectors = &one_vector;
3815 msg.msg_namelen = g_socket_address_get_native_size (address);
3816 msg.msg_name = g_alloca (msg.msg_namelen);
3817 if (!g_socket_address_to_native (address, msg.msg_name, msg.msg_namelen, error))
3822 msg.msg_name = NULL;
3823 msg.msg_namelen = 0;
3828 /* this entire expression will be evaluated at compile time */
3829 if (sizeof *msg.msg_iov == sizeof *vectors &&
3830 sizeof msg.msg_iov->iov_base == sizeof vectors->buffer &&
3831 G_STRUCT_OFFSET (struct iovec, iov_base) ==
3832 G_STRUCT_OFFSET (GOutputVector, buffer) &&
3833 sizeof msg.msg_iov->iov_len == sizeof vectors->size &&
3834 G_STRUCT_OFFSET (struct iovec, iov_len) ==
3835 G_STRUCT_OFFSET (GOutputVector, size))
3836 /* ABI is compatible */
3838 msg.msg_iov = (struct iovec *) vectors;
3839 msg.msg_iovlen = num_vectors;
3842 /* ABI is incompatible */
3846 msg.msg_iov = g_newa (struct iovec, num_vectors);
3847 for (i = 0; i < num_vectors; i++)
3849 msg.msg_iov[i].iov_base = (void *) vectors[i].buffer;
3850 msg.msg_iov[i].iov_len = vectors[i].size;
3852 msg.msg_iovlen = num_vectors;
3858 struct cmsghdr *cmsg;
3861 msg.msg_controllen = 0;
3862 for (i = 0; i < num_messages; i++)
3863 msg.msg_controllen += CMSG_SPACE (g_socket_control_message_get_size (messages[i]));
3865 if (msg.msg_controllen == 0)
3866 msg.msg_control = NULL;
3869 msg.msg_control = g_alloca (msg.msg_controllen);
3870 memset (msg.msg_control, '\0', msg.msg_controllen);
3873 cmsg = CMSG_FIRSTHDR (&msg);
3874 for (i = 0; i < num_messages; i++)
3876 cmsg->cmsg_level = g_socket_control_message_get_level (messages[i]);
3877 cmsg->cmsg_type = g_socket_control_message_get_msg_type (messages[i]);
3878 cmsg->cmsg_len = CMSG_LEN (g_socket_control_message_get_size (messages[i]));
3879 g_socket_control_message_serialize (messages[i],
3881 cmsg = CMSG_NXTHDR (&msg, cmsg);
3883 g_assert (cmsg == NULL);
3888 if (socket->priv->blocking &&
3889 !g_socket_condition_wait (socket,
3890 G_IO_OUT, cancellable, error))
3893 result = sendmsg (socket->priv->fd, &msg, flags | G_SOCKET_DEFAULT_SEND_FLAGS);
3896 int errsv = get_socket_errno ();
3901 if (socket->priv->blocking &&
3902 (errsv == EWOULDBLOCK ||
3906 g_set_error (error, G_IO_ERROR,
3907 socket_io_error_from_errno (errsv),
3908 _("Error sending message: %s"), socket_strerror (errsv));
3919 struct sockaddr_storage addr;
3926 /* Win32 doesn't support control messages.
3927 Actually this is possible for raw and datagram sockets
3928 via WSASendMessage on Vista or later, but that doesn't
3930 if (num_messages != 0)
3932 g_set_error_literal (error, G_IO_ERROR, G_IO_ERROR_NOT_SUPPORTED,
3933 _("GSocketControlMessage not supported on Windows"));
3938 bufs = g_newa (WSABUF, num_vectors);
3939 for (i = 0; i < num_vectors; i++)
3941 bufs[i].buf = (char *)vectors[i].buffer;
3942 bufs[i].len = (gulong)vectors[i].size;
3946 addrlen = 0; /* Avoid warning */
3949 addrlen = g_socket_address_get_native_size (address);
3950 if (!g_socket_address_to_native (address, &addr, sizeof addr, error))
3956 if (socket->priv->blocking &&
3957 !g_socket_condition_wait (socket,
3958 G_IO_OUT, cancellable, error))
3962 result = WSASendTo (socket->priv->fd,
3965 (const struct sockaddr *)&addr, addrlen,
3968 result = WSASend (socket->priv->fd,
3975 int errsv = get_socket_errno ();
3977 if (errsv == WSAEINTR)
3980 if (errsv == WSAEWOULDBLOCK)
3981 win32_unset_event_mask (socket, FD_WRITE);
3983 if (socket->priv->blocking &&
3984 errsv == WSAEWOULDBLOCK)
3987 g_set_error (error, G_IO_ERROR,
3988 socket_io_error_from_errno (errsv),
3989 _("Error sending message: %s"), socket_strerror (errsv));
4001 static GSocketAddress *
4002 cache_recv_address (GSocket *socket, struct sockaddr *native, int native_len)
4004 GSocketAddress *saddr;
4006 guint64 oldest_time = G_MAXUINT64;
4007 gint oldest_index = 0;
4009 if (native_len <= 0)
4013 for (i = 0; i < RECV_ADDR_CACHE_SIZE; i++)
4015 GSocketAddress *tmp = socket->priv->recv_addr_cache[i].addr;
4016 gpointer tmp_native = socket->priv->recv_addr_cache[i].native;
4017 gint tmp_native_len = socket->priv->recv_addr_cache[i].native_len;
4022 if (tmp_native_len != native_len)
4025 if (memcmp (tmp_native, native, native_len) == 0)
4027 saddr = g_object_ref (tmp);
4028 socket->priv->recv_addr_cache[i].last_used = g_get_monotonic_time ();
4032 if (socket->priv->recv_addr_cache[i].last_used < oldest_time)
4034 oldest_time = socket->priv->recv_addr_cache[i].last_used;
4039 saddr = g_socket_address_new_from_native (native, native_len);
4041 if (socket->priv->recv_addr_cache[oldest_index].addr)
4043 g_object_unref (socket->priv->recv_addr_cache[oldest_index].addr);
4044 g_free (socket->priv->recv_addr_cache[oldest_index].native);
4047 socket->priv->recv_addr_cache[oldest_index].native = g_memdup (native, native_len);
4048 socket->priv->recv_addr_cache[oldest_index].native_len = native_len;
4049 socket->priv->recv_addr_cache[oldest_index].addr = g_object_ref (saddr);
4050 socket->priv->recv_addr_cache[oldest_index].last_used = g_get_monotonic_time ();
4056 * g_socket_receive_message:
4057 * @socket: a #GSocket
4058 * @address: (out) (allow-none): a pointer to a #GSocketAddress
4060 * @vectors: (array length=num_vectors): an array of #GInputVector structs
4061 * @num_vectors: the number of elements in @vectors, or -1
4062 * @messages: (array length=num_messages) (allow-none): a pointer which
4063 * may be filled with an array of #GSocketControlMessages, or %NULL
4064 * @num_messages: a pointer which will be filled with the number of
4065 * elements in @messages, or %NULL
4066 * @flags: a pointer to an int containing #GSocketMsgFlags flags
4067 * @cancellable: (allow-none): a %GCancellable or %NULL
4068 * @error: a #GError pointer, or %NULL
4070 * Receive data from a socket. This is the most complicated and
4071 * fully-featured version of this call. For easier use, see
4072 * g_socket_receive() and g_socket_receive_from().
4074 * If @address is non-%NULL then @address will be set equal to the
4075 * source address of the received packet.
4076 * @address is owned by the caller.
4078 * @vector must point to an array of #GInputVector structs and
4079 * @num_vectors must be the length of this array. These structs
4080 * describe the buffers that received data will be scattered into.
4081 * If @num_vectors is -1, then @vectors is assumed to be terminated
4082 * by a #GInputVector with a %NULL buffer pointer.
4084 * As a special case, if @num_vectors is 0 (in which case, @vectors
4085 * may of course be %NULL), then a single byte is received and
4086 * discarded. This is to facilitate the common practice of sending a
4087 * single '\0' byte for the purposes of transferring ancillary data.
4089 * @messages, if non-%NULL, will be set to point to a newly-allocated
4090 * array of #GSocketControlMessage instances or %NULL if no such
4091 * messages was received. These correspond to the control messages
4092 * received from the kernel, one #GSocketControlMessage per message
4093 * from the kernel. This array is %NULL-terminated and must be freed
4094 * by the caller using g_free() after calling g_object_unref() on each
4095 * element. If @messages is %NULL, any control messages received will
4098 * @num_messages, if non-%NULL, will be set to the number of control
4099 * messages received.
4101 * If both @messages and @num_messages are non-%NULL, then
4102 * @num_messages gives the number of #GSocketControlMessage instances
4103 * in @messages (ie: not including the %NULL terminator).
4105 * @flags is an in/out parameter. The commonly available arguments
4106 * for this are available in the #GSocketMsgFlags enum, but the
4107 * values there are the same as the system values, and the flags
4108 * are passed in as-is, so you can pass in system-specific flags too
4109 * (and g_socket_receive_message() may pass system-specific flags out).
4111 * As with g_socket_receive(), data may be discarded if @socket is
4112 * %G_SOCKET_TYPE_DATAGRAM or %G_SOCKET_TYPE_SEQPACKET and you do not
4113 * provide enough buffer space to read a complete message. You can pass
4114 * %G_SOCKET_MSG_PEEK in @flags to peek at the current message without
4115 * removing it from the receive queue, but there is no portable way to find
4116 * out the length of the message other than by reading it into a
4117 * sufficiently-large buffer.
4119 * If the socket is in blocking mode the call will block until there
4120 * is some data to receive, the connection is closed, or there is an
4121 * error. If there is no data available and the socket is in
4122 * non-blocking mode, a %G_IO_ERROR_WOULD_BLOCK error will be
4123 * returned. To be notified when data is available, wait for the
4124 * %G_IO_IN condition.
4126 * On error -1 is returned and @error is set accordingly.
4128 * Returns: Number of bytes read, or 0 if the connection was closed by
4129 * the peer, or -1 on error
4134 g_socket_receive_message (GSocket *socket,
4135 GSocketAddress **address,
4136 GInputVector *vectors,
4138 GSocketControlMessage ***messages,
4141 GCancellable *cancellable,
4144 GInputVector one_vector;
4147 g_return_val_if_fail (G_IS_SOCKET (socket), -1);
4149 if (!check_socket (socket, error))
4152 if (!check_timeout (socket, error))
4155 if (g_cancellable_set_error_if_cancelled (cancellable, error))
4158 if (num_vectors == -1)
4160 for (num_vectors = 0;
4161 vectors[num_vectors].buffer != NULL;
4166 if (num_vectors == 0)
4168 one_vector.buffer = &one_byte;
4169 one_vector.size = 1;
4171 vectors = &one_vector;
4178 struct sockaddr_storage one_sockaddr;
4183 msg.msg_name = &one_sockaddr;
4184 msg.msg_namelen = sizeof (struct sockaddr_storage);
4188 msg.msg_name = NULL;
4189 msg.msg_namelen = 0;
4193 /* this entire expression will be evaluated at compile time */
4194 if (sizeof *msg.msg_iov == sizeof *vectors &&
4195 sizeof msg.msg_iov->iov_base == sizeof vectors->buffer &&
4196 G_STRUCT_OFFSET (struct iovec, iov_base) ==
4197 G_STRUCT_OFFSET (GInputVector, buffer) &&
4198 sizeof msg.msg_iov->iov_len == sizeof vectors->size &&
4199 G_STRUCT_OFFSET (struct iovec, iov_len) ==
4200 G_STRUCT_OFFSET (GInputVector, size))
4201 /* ABI is compatible */
4203 msg.msg_iov = (struct iovec *) vectors;
4204 msg.msg_iovlen = num_vectors;
4207 /* ABI is incompatible */
4211 msg.msg_iov = g_newa (struct iovec, num_vectors);
4212 for (i = 0; i < num_vectors; i++)
4214 msg.msg_iov[i].iov_base = vectors[i].buffer;
4215 msg.msg_iov[i].iov_len = vectors[i].size;
4217 msg.msg_iovlen = num_vectors;
4221 msg.msg_control = g_alloca (2048);
4222 msg.msg_controllen = 2048;
4226 msg.msg_flags = *flags;
4230 /* We always set the close-on-exec flag so we don't leak file
4231 * descriptors into child processes. Note that gunixfdmessage.c
4232 * will later call fcntl (fd, FD_CLOEXEC), but that isn't atomic.
4234 #ifdef MSG_CMSG_CLOEXEC
4235 msg.msg_flags |= MSG_CMSG_CLOEXEC;
4241 if (socket->priv->blocking &&
4242 !g_socket_condition_wait (socket,
4243 G_IO_IN, cancellable, error))
4246 result = recvmsg (socket->priv->fd, &msg, msg.msg_flags);
4247 #ifdef MSG_CMSG_CLOEXEC
4248 if (result < 0 && get_socket_errno () == EINVAL)
4250 /* We must be running on an old kernel. Call without the flag. */
4251 msg.msg_flags &= ~(MSG_CMSG_CLOEXEC);
4252 result = recvmsg (socket->priv->fd, &msg, msg.msg_flags);
4258 int errsv = get_socket_errno ();
4263 if (socket->priv->blocking &&
4264 (errsv == EWOULDBLOCK ||
4268 g_set_error (error, G_IO_ERROR,
4269 socket_io_error_from_errno (errsv),
4270 _("Error receiving message: %s"), socket_strerror (errsv));
4277 /* decode address */
4278 if (address != NULL)
4280 *address = cache_recv_address (socket, msg.msg_name, msg.msg_namelen);
4283 /* decode control messages */
4285 GPtrArray *my_messages = NULL;
4286 struct cmsghdr *cmsg;
4288 if (msg.msg_controllen >= sizeof (struct cmsghdr))
4290 for (cmsg = CMSG_FIRSTHDR (&msg); cmsg; cmsg = CMSG_NXTHDR (&msg, cmsg))
4292 GSocketControlMessage *message;
4294 message = g_socket_control_message_deserialize (cmsg->cmsg_level,
4296 cmsg->cmsg_len - ((char *)CMSG_DATA (cmsg) - (char *)cmsg),
4298 if (message == NULL)
4299 /* We've already spewed about the problem in the
4300 deserialization code, so just continue */
4303 if (messages == NULL)
4305 /* we have to do it this way if the user ignores the
4306 * messages so that we will close any received fds.
4308 g_object_unref (message);
4312 if (my_messages == NULL)
4313 my_messages = g_ptr_array_new ();
4314 g_ptr_array_add (my_messages, message);
4320 *num_messages = my_messages != NULL ? my_messages->len : 0;
4324 if (my_messages == NULL)
4330 g_ptr_array_add (my_messages, NULL);
4331 *messages = (GSocketControlMessage **) g_ptr_array_free (my_messages, FALSE);
4336 g_assert (my_messages == NULL);
4340 /* capture the flags */
4342 *flags = msg.msg_flags;
4348 struct sockaddr_storage addr;
4350 DWORD bytes_received;
4357 bufs = g_newa (WSABUF, num_vectors);
4358 for (i = 0; i < num_vectors; i++)
4360 bufs[i].buf = (char *)vectors[i].buffer;
4361 bufs[i].len = (gulong)vectors[i].size;
4373 if (socket->priv->blocking &&
4374 !g_socket_condition_wait (socket,
4375 G_IO_IN, cancellable, error))
4378 addrlen = sizeof addr;
4380 result = WSARecvFrom (socket->priv->fd,
4382 &bytes_received, &win_flags,
4383 (struct sockaddr *)&addr, &addrlen,
4386 result = WSARecv (socket->priv->fd,
4388 &bytes_received, &win_flags,
4392 int errsv = get_socket_errno ();
4394 if (errsv == WSAEINTR)
4397 win32_unset_event_mask (socket, FD_READ);
4399 if (socket->priv->blocking &&
4400 errsv == WSAEWOULDBLOCK)
4403 g_set_error (error, G_IO_ERROR,
4404 socket_io_error_from_errno (errsv),
4405 _("Error receiving message: %s"), socket_strerror (errsv));
4409 win32_unset_event_mask (socket, FD_READ);
4413 /* decode address */
4414 if (address != NULL)
4416 *address = cache_recv_address (socket, (struct sockaddr *)&addr, addrlen);
4419 /* capture the flags */
4423 if (messages != NULL)
4425 if (num_messages != NULL)
4428 return bytes_received;
4434 * g_socket_get_credentials:
4435 * @socket: a #GSocket.
4436 * @error: #GError for error reporting, or %NULL to ignore.
4438 * Returns the credentials of the foreign process connected to this
4439 * socket, if any (e.g. it is only supported for %G_SOCKET_FAMILY_UNIX
4442 * If this operation isn't supported on the OS, the method fails with
4443 * the %G_IO_ERROR_NOT_SUPPORTED error. On Linux this is implemented
4444 * by reading the %SO_PEERCRED option on the underlying socket.
4446 * Other ways to obtain credentials from a foreign peer includes the
4447 * #GUnixCredentialsMessage type and
4448 * g_unix_connection_send_credentials() /
4449 * g_unix_connection_receive_credentials() functions.
4451 * Returns: (transfer full): %NULL if @error is set, otherwise a #GCredentials object
4452 * that must be freed with g_object_unref().
4457 g_socket_get_credentials (GSocket *socket,
4462 g_return_val_if_fail (G_IS_SOCKET (socket), NULL);
4463 g_return_val_if_fail (error == NULL || *error == NULL, NULL);
4467 #if G_CREDENTIALS_SOCKET_GET_CREDENTIALS_SUPPORTED
4471 guint8 native_creds_buf[G_CREDENTIALS_NATIVE_SIZE];
4472 socklen_t optlen = sizeof (native_creds_buf);
4474 if (getsockopt (socket->priv->fd,
4480 ret = g_credentials_new ();
4481 g_credentials_set_native (ret,
4482 G_CREDENTIALS_NATIVE_TYPE,
4486 #elif G_CREDENTIALS_USE_SOLARIS_UCRED
4488 ucred_t *ucred = NULL;
4490 if (getpeerucred (socket->priv->fd, &ucred) == 0)
4492 ret = g_credentials_new ();
4493 g_credentials_set_native (ret,
4494 G_CREDENTIALS_TYPE_SOLARIS_UCRED,
4500 #error "G_CREDENTIALS_SOCKET_GET_CREDENTIALS_SUPPORTED is set but this is no code for this platform"
4505 int errsv = get_socket_errno ();
4509 socket_io_error_from_errno (errsv),
4510 _("Unable to read socket credentials: %s"),
4511 socket_strerror (errsv));
4516 g_set_error_literal (error,
4518 G_IO_ERROR_NOT_SUPPORTED,
4519 _("g_socket_get_credentials not implemented for this OS"));
4526 * g_socket_get_option:
4527 * @socket: a #GSocket
4528 * @level: the "API level" of the option (eg, `SOL_SOCKET`)
4529 * @optname: the "name" of the option (eg, `SO_BROADCAST`)
4530 * @value: (out): return location for the option value
4531 * @error: #GError for error reporting, or %NULL to ignore.
4533 * Gets the value of an integer-valued option on @socket, as with
4534 * getsockopt(). (If you need to fetch a non-integer-valued option,
4535 * you will need to call getsockopt() directly.)
4537 * The [<gio/gnetworking.h>][gio-gnetworking.h]
4538 * header pulls in system headers that will define most of the
4539 * standard/portable socket options. For unusual socket protocols or
4540 * platform-dependent options, you may need to include additional
4543 * Note that even for socket options that are a single byte in size,
4544 * @value is still a pointer to a #gint variable, not a #guchar;
4545 * g_socket_get_option() will handle the conversion internally.
4547 * Returns: success or failure. On failure, @error will be set, and
4548 * the system error value (`errno` or WSAGetLastError()) will still
4549 * be set to the result of the getsockopt() call.
4554 g_socket_get_option (GSocket *socket,
4562 g_return_val_if_fail (G_IS_SOCKET (socket), FALSE);
4565 size = sizeof (gint);
4566 if (getsockopt (socket->priv->fd, level, optname, value, &size) != 0)
4568 int errsv = get_socket_errno ();
4570 g_set_error_literal (error,
4572 socket_io_error_from_errno (errsv),
4573 socket_strerror (errsv));
4575 /* Reset errno in case the caller wants to look at it */
4581 #if G_BYTE_ORDER == G_BIG_ENDIAN
4582 /* If the returned value is smaller than an int then we need to
4583 * slide it over into the low-order bytes of *value.
4585 if (size != sizeof (gint))
4586 *value = *value >> (8 * (sizeof (gint) - size));
4593 * g_socket_set_option:
4594 * @socket: a #GSocket
4595 * @level: the "API level" of the option (eg, `SOL_SOCKET`)
4596 * @optname: the "name" of the option (eg, `SO_BROADCAST`)
4597 * @value: the value to set the option to
4598 * @error: #GError for error reporting, or %NULL to ignore.
4600 * Sets the value of an integer-valued option on @socket, as with
4601 * setsockopt(). (If you need to set a non-integer-valued option,
4602 * you will need to call setsockopt() directly.)
4604 * The [<gio/gnetworking.h>][gio-gnetworking.h]
4605 * header pulls in system headers that will define most of the
4606 * standard/portable socket options. For unusual socket protocols or
4607 * platform-dependent options, you may need to include additional
4610 * Returns: success or failure. On failure, @error will be set, and
4611 * the system error value (`errno` or WSAGetLastError()) will still
4612 * be set to the result of the setsockopt() call.
4617 g_socket_set_option (GSocket *socket,
4625 g_return_val_if_fail (G_IS_SOCKET (socket), FALSE);
4627 if (setsockopt (socket->priv->fd, level, optname, &value, sizeof (gint)) == 0)
4630 #if !defined (__linux__) && !defined (G_OS_WIN32)
4631 /* Linux and Windows let you set a single-byte value from an int,
4632 * but most other platforms don't.
4634 if (errno == EINVAL && value >= SCHAR_MIN && value <= CHAR_MAX)
4636 #if G_BYTE_ORDER == G_BIG_ENDIAN
4637 value = value << (8 * (sizeof (gint) - 1));
4639 if (setsockopt (socket->priv->fd, level, optname, &value, 1) == 0)
4644 errsv = get_socket_errno ();
4646 g_set_error_literal (error,
4648 socket_io_error_from_errno (errsv),
4649 socket_strerror (errsv));