1 /* GIO - GLib Input, Output and Streaming Library
3 * Copyright (C) 2008 Christian Kellner, Samuel Cormier-Iijima
4 * Copyright © 2009 Codethink Limited
5 * Copyright © 2009 Red Hat, Inc
7 * This library is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2 of the License, or (at your option) any later version.
12 * This library is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General
18 * Public License along with this library; if not, write to the
19 * Free Software Foundation, Inc., 59 Temple Place, Suite 330,
20 * Boston, MA 02111-1307, USA.
22 * Authors: Christian Kellner <gicmo@gnome.org>
23 * Samuel Cormier-Iijima <sciyoshi@gmail.com>
24 * Ryan Lortie <desrt@desrt.ca>
25 * Alexander Larsson <alexl@redhat.com>
33 #include "glib-unix.h"
44 # include <sys/ioctl.h>
47 #ifdef HAVE_SYS_FILIO_H
48 # include <sys/filio.h>
55 #include "gcancellable.h"
56 #include "gioenumtypes.h"
57 #include "ginetaddress.h"
58 #include "ginitable.h"
62 #include "gnetworking.h"
63 #include "gsocketaddress.h"
64 #include "gsocketcontrolmessage.h"
65 #include "gcredentials.h"
70 * @short_description: Low-level socket object
72 * @see_also: #GInitable, <link linkend="gio-gnetworking.h">gnetworking.h</link>
74 * A #GSocket is a low-level networking primitive. It is a more or less
75 * direct mapping of the BSD socket API in a portable GObject based API.
76 * It supports both the UNIX socket implementations and winsock2 on Windows.
78 * #GSocket is the platform independent base upon which the higher level
79 * network primitives are based. Applications are not typically meant to
80 * use it directly, but rather through classes like #GSocketClient,
81 * #GSocketService and #GSocketConnection. However there may be cases where
82 * direct use of #GSocket is useful.
84 * #GSocket implements the #GInitable interface, so if it is manually constructed
85 * by e.g. g_object_new() you must call g_initable_init() and check the
86 * results before using the object. This is done automatically in
87 * g_socket_new() and g_socket_new_from_fd(), so these functions can return
90 * Sockets operate in two general modes, blocking or non-blocking. When
91 * in blocking mode all operations block until the requested operation
92 * is finished or there is an error. In non-blocking mode all calls that
93 * would block return immediately with a %G_IO_ERROR_WOULD_BLOCK error.
94 * To know when a call would successfully run you can call g_socket_condition_check(),
95 * or g_socket_condition_wait(). You can also use g_socket_create_source() and
96 * attach it to a #GMainContext to get callbacks when I/O is possible.
97 * Note that all sockets are always set to non blocking mode in the system, and
98 * blocking mode is emulated in GSocket.
100 * When working in non-blocking mode applications should always be able to
101 * handle getting a %G_IO_ERROR_WOULD_BLOCK error even when some other
102 * function said that I/O was possible. This can easily happen in case
103 * of a race condition in the application, but it can also happen for other
104 * reasons. For instance, on Windows a socket is always seen as writable
105 * until a write returns %G_IO_ERROR_WOULD_BLOCK.
107 * #GSocket<!-- -->s can be either connection oriented or datagram based.
108 * For connection oriented types you must first establish a connection by
109 * either connecting to an address or accepting a connection from another
110 * address. For connectionless socket types the target/source address is
111 * specified or received in each I/O operation.
113 * All socket file descriptors are set to be close-on-exec.
115 * Note that creating a #GSocket causes the signal %SIGPIPE to be
116 * ignored for the remainder of the program. If you are writing a
117 * command-line utility that uses #GSocket, you may need to take into
118 * account the fact that your program will not automatically be killed
119 * if it tries to write to %stdout after it has been closed.
124 static void g_socket_initable_iface_init (GInitableIface *iface);
125 static gboolean g_socket_initable_init (GInitable *initable,
126 GCancellable *cancellable,
129 G_DEFINE_TYPE_WITH_CODE (GSocket, g_socket, G_TYPE_OBJECT,
130 g_networking_init ();
131 G_IMPLEMENT_INTERFACE (G_TYPE_INITABLE,
132 g_socket_initable_iface_init));
149 PROP_MULTICAST_LOOPBACK,
153 /* Size of the receiver cache for g_socket_receive_from() */
154 #define RECV_ADDR_CACHE_SIZE 8
156 struct _GSocketPrivate
158 GSocketFamily family;
160 GSocketProtocol protocol;
164 GError *construct_error;
165 GSocketAddress *remote_address;
173 guint connect_pending : 1;
179 GList *requested_conditions; /* list of requested GIOCondition * */
183 GSocketAddress *addr;
184 struct sockaddr *native;
187 } recv_addr_cache[RECV_ADDR_CACHE_SIZE];
191 get_socket_errno (void)
196 return WSAGetLastError ();
201 socket_io_error_from_errno (int err)
204 return g_io_error_from_errno (err);
209 return G_IO_ERROR_ADDRESS_IN_USE;
211 return G_IO_ERROR_WOULD_BLOCK;
213 return G_IO_ERROR_PERMISSION_DENIED;
214 case WSA_INVALID_HANDLE:
215 case WSA_INVALID_PARAMETER:
218 return G_IO_ERROR_INVALID_ARGUMENT;
219 case WSAEPROTONOSUPPORT:
220 return G_IO_ERROR_NOT_SUPPORTED;
222 return G_IO_ERROR_CANCELLED;
223 case WSAESOCKTNOSUPPORT:
225 case WSAEPFNOSUPPORT:
226 case WSAEAFNOSUPPORT:
227 return G_IO_ERROR_NOT_SUPPORTED;
229 return G_IO_ERROR_FAILED;
235 socket_strerror (int err)
238 return g_strerror (err);
243 msg = g_win32_error_message (err);
245 msg_ret = g_intern_string (msg);
253 #define win32_unset_event_mask(_socket, _mask) _win32_unset_event_mask (_socket, _mask)
255 _win32_unset_event_mask (GSocket *socket, int mask)
257 socket->priv->current_events &= ~mask;
258 socket->priv->current_errors &= ~mask;
261 #define win32_unset_event_mask(_socket, _mask)
264 /* Windows has broken prototypes... */
266 #define getsockopt(sockfd, level, optname, optval, optlen) \
267 getsockopt (sockfd, level, optname, (gpointer) optval, (int*) optlen)
268 #define setsockopt(sockfd, level, optname, optval, optlen) \
269 setsockopt (sockfd, level, optname, (gpointer) optval, optlen)
270 #define getsockname(sockfd, addr, addrlen) \
271 getsockname (sockfd, addr, (int *)addrlen)
272 #define getpeername(sockfd, addr, addrlen) \
273 getpeername (sockfd, addr, (int *)addrlen)
274 #define recv(sockfd, buf, len, flags) \
275 recv (sockfd, (gpointer)buf, len, flags)
279 set_fd_nonblocking (int fd)
282 GError *error = NULL;
288 if (!g_unix_set_fd_nonblocking (fd, TRUE, &error))
290 g_warning ("Error setting socket nonblocking: %s", error->message);
291 g_clear_error (&error);
296 if (ioctlsocket (fd, FIONBIO, &arg) == SOCKET_ERROR)
298 int errsv = get_socket_errno ();
299 g_warning ("Error setting socket status flags: %s", socket_strerror (errsv));
305 check_socket (GSocket *socket,
308 if (!socket->priv->inited)
310 g_set_error_literal (error, G_IO_ERROR, G_IO_ERROR_NOT_INITIALIZED,
311 _("Invalid socket, not initialized"));
315 if (socket->priv->construct_error)
317 g_set_error (error, G_IO_ERROR, G_IO_ERROR_NOT_INITIALIZED,
318 _("Invalid socket, initialization failed due to: %s"),
319 socket->priv->construct_error->message);
323 if (socket->priv->closed)
325 g_set_error_literal (error, G_IO_ERROR, G_IO_ERROR_CLOSED,
326 _("Socket is already closed"));
330 if (socket->priv->timed_out)
332 socket->priv->timed_out = FALSE;
333 g_set_error_literal (error, G_IO_ERROR, G_IO_ERROR_TIMED_OUT,
334 _("Socket I/O timed out"));
342 g_socket_details_from_fd (GSocket *socket)
344 struct sockaddr_storage address;
350 fd = socket->priv->fd;
351 if (!g_socket_get_option (socket, SOL_SOCKET, SO_TYPE, &value, NULL))
353 errsv = get_socket_errno ();
365 /* programmer error */
366 g_error ("creating GSocket from fd %d: %s\n",
367 fd, socket_strerror (errsv));
378 socket->priv->type = G_SOCKET_TYPE_STREAM;
382 socket->priv->type = G_SOCKET_TYPE_DATAGRAM;
386 socket->priv->type = G_SOCKET_TYPE_SEQPACKET;
390 socket->priv->type = G_SOCKET_TYPE_INVALID;
394 addrlen = sizeof address;
395 if (getsockname (fd, (struct sockaddr *) &address, &addrlen) != 0)
397 errsv = get_socket_errno ();
403 g_assert (G_STRUCT_OFFSET (struct sockaddr, sa_family) +
404 sizeof address.ss_family <= addrlen);
405 family = address.ss_family;
409 /* On Solaris, this happens if the socket is not yet connected.
410 * But we can use SO_DOMAIN as a workaround there.
413 if (!g_socket_get_option (socket, SOL_SOCKET, SO_DOMAIN, &family, NULL))
415 errsv = get_socket_errno ();
419 /* This will translate to G_IO_ERROR_FAILED on either unix or windows */
427 case G_SOCKET_FAMILY_IPV4:
428 case G_SOCKET_FAMILY_IPV6:
429 socket->priv->family = address.ss_family;
430 switch (socket->priv->type)
432 case G_SOCKET_TYPE_STREAM:
433 socket->priv->protocol = G_SOCKET_PROTOCOL_TCP;
436 case G_SOCKET_TYPE_DATAGRAM:
437 socket->priv->protocol = G_SOCKET_PROTOCOL_UDP;
440 case G_SOCKET_TYPE_SEQPACKET:
441 socket->priv->protocol = G_SOCKET_PROTOCOL_SCTP;
449 case G_SOCKET_FAMILY_UNIX:
450 socket->priv->family = G_SOCKET_FAMILY_UNIX;
451 socket->priv->protocol = G_SOCKET_PROTOCOL_DEFAULT;
455 socket->priv->family = G_SOCKET_FAMILY_INVALID;
459 if (socket->priv->family != G_SOCKET_FAMILY_INVALID)
461 addrlen = sizeof address;
462 if (getpeername (fd, (struct sockaddr *) &address, &addrlen) >= 0)
463 socket->priv->connected = TRUE;
466 if (g_socket_get_option (socket, SOL_SOCKET, SO_KEEPALIVE, &value, NULL))
468 socket->priv->keepalive = !!value;
472 /* Can't read, maybe not supported, assume FALSE */
473 socket->priv->keepalive = FALSE;
479 g_set_error (&socket->priv->construct_error, G_IO_ERROR,
480 socket_io_error_from_errno (errsv),
481 _("creating GSocket from fd: %s"),
482 socket_strerror (errsv));
486 g_socket_create_socket (GSocketFamily family,
496 case G_SOCKET_TYPE_STREAM:
497 native_type = SOCK_STREAM;
500 case G_SOCKET_TYPE_DATAGRAM:
501 native_type = SOCK_DGRAM;
504 case G_SOCKET_TYPE_SEQPACKET:
505 native_type = SOCK_SEQPACKET;
509 g_assert_not_reached ();
514 g_set_error (error, G_IO_ERROR, G_IO_ERROR_INVALID_ARGUMENT,
515 _("Unable to create socket: %s"), _("Unknown family was specified"));
521 g_set_error (error, G_IO_ERROR, G_IO_ERROR_INVALID_ARGUMENT,
522 _("Unable to create socket: %s"), _("Unknown protocol was specified"));
527 fd = socket (family, native_type | SOCK_CLOEXEC, protocol);
528 /* It's possible that libc has SOCK_CLOEXEC but the kernel does not */
529 if (fd < 0 && errno == EINVAL)
531 fd = socket (family, native_type, protocol);
535 int errsv = get_socket_errno ();
537 g_set_error (error, G_IO_ERROR, socket_io_error_from_errno (errsv),
538 _("Unable to create socket: %s"), socket_strerror (errsv));
545 /* We always want to set close-on-exec to protect users. If you
546 need to so some weird inheritance to exec you can re-enable this
547 using lower level hacks with g_socket_get_fd(). */
548 flags = fcntl (fd, F_GETFD, 0);
550 (flags & FD_CLOEXEC) == 0)
553 fcntl (fd, F_SETFD, flags);
562 g_socket_constructed (GObject *object)
564 GSocket *socket = G_SOCKET (object);
566 if (socket->priv->fd >= 0)
567 /* create socket->priv info from the fd */
568 g_socket_details_from_fd (socket);
571 /* create the fd from socket->priv info */
572 socket->priv->fd = g_socket_create_socket (socket->priv->family,
574 socket->priv->protocol,
575 &socket->priv->construct_error);
577 /* Always use native nonblocking sockets, as
578 windows sets sockets to nonblocking automatically
579 in certain operations. This way we make things work
580 the same on all platforms */
581 if (socket->priv->fd != -1)
582 set_fd_nonblocking (socket->priv->fd);
586 g_socket_get_property (GObject *object,
591 GSocket *socket = G_SOCKET (object);
592 GSocketAddress *address;
597 g_value_set_enum (value, socket->priv->family);
601 g_value_set_enum (value, socket->priv->type);
605 g_value_set_enum (value, socket->priv->protocol);
609 g_value_set_int (value, socket->priv->fd);
613 g_value_set_boolean (value, socket->priv->blocking);
616 case PROP_LISTEN_BACKLOG:
617 g_value_set_int (value, socket->priv->listen_backlog);
621 g_value_set_boolean (value, socket->priv->keepalive);
624 case PROP_LOCAL_ADDRESS:
625 address = g_socket_get_local_address (socket, NULL);
626 g_value_take_object (value, address);
629 case PROP_REMOTE_ADDRESS:
630 address = g_socket_get_remote_address (socket, NULL);
631 g_value_take_object (value, address);
635 g_value_set_uint (value, socket->priv->timeout);
639 g_value_set_uint (value, g_socket_get_ttl (socket));
643 g_value_set_boolean (value, g_socket_get_broadcast (socket));
646 case PROP_MULTICAST_LOOPBACK:
647 g_value_set_boolean (value, g_socket_get_multicast_loopback (socket));
650 case PROP_MULTICAST_TTL:
651 g_value_set_uint (value, g_socket_get_multicast_ttl (socket));
655 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
660 g_socket_set_property (GObject *object,
665 GSocket *socket = G_SOCKET (object);
670 socket->priv->family = g_value_get_enum (value);
674 socket->priv->type = g_value_get_enum (value);
678 socket->priv->protocol = g_value_get_enum (value);
682 socket->priv->fd = g_value_get_int (value);
686 g_socket_set_blocking (socket, g_value_get_boolean (value));
689 case PROP_LISTEN_BACKLOG:
690 g_socket_set_listen_backlog (socket, g_value_get_int (value));
694 g_socket_set_keepalive (socket, g_value_get_boolean (value));
698 g_socket_set_timeout (socket, g_value_get_uint (value));
702 g_socket_set_ttl (socket, g_value_get_uint (value));
706 g_socket_set_broadcast (socket, g_value_get_boolean (value));
709 case PROP_MULTICAST_LOOPBACK:
710 g_socket_set_multicast_loopback (socket, g_value_get_boolean (value));
713 case PROP_MULTICAST_TTL:
714 g_socket_set_multicast_ttl (socket, g_value_get_uint (value));
718 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
723 g_socket_finalize (GObject *object)
725 GSocket *socket = G_SOCKET (object);
728 g_clear_error (&socket->priv->construct_error);
730 if (socket->priv->fd != -1 &&
731 !socket->priv->closed)
732 g_socket_close (socket, NULL);
734 if (socket->priv->remote_address)
735 g_object_unref (socket->priv->remote_address);
738 if (socket->priv->event != WSA_INVALID_EVENT)
740 WSACloseEvent (socket->priv->event);
741 socket->priv->event = WSA_INVALID_EVENT;
744 g_assert (socket->priv->requested_conditions == NULL);
747 for (i = 0; i < RECV_ADDR_CACHE_SIZE; i++)
749 if (socket->priv->recv_addr_cache[i].addr)
751 g_object_unref (socket->priv->recv_addr_cache[i].addr);
752 g_free (socket->priv->recv_addr_cache[i].native);
756 if (G_OBJECT_CLASS (g_socket_parent_class)->finalize)
757 (*G_OBJECT_CLASS (g_socket_parent_class)->finalize) (object);
761 g_socket_class_init (GSocketClass *klass)
763 GObjectClass *gobject_class G_GNUC_UNUSED = G_OBJECT_CLASS (klass);
766 /* There is no portable, thread-safe way to avoid having the process
767 * be killed by SIGPIPE when calling send() or sendmsg(), so we are
768 * forced to simply ignore the signal process-wide.
770 signal (SIGPIPE, SIG_IGN);
773 g_type_class_add_private (klass, sizeof (GSocketPrivate));
775 gobject_class->finalize = g_socket_finalize;
776 gobject_class->constructed = g_socket_constructed;
777 gobject_class->set_property = g_socket_set_property;
778 gobject_class->get_property = g_socket_get_property;
780 g_object_class_install_property (gobject_class, PROP_FAMILY,
781 g_param_spec_enum ("family",
783 P_("The sockets address family"),
784 G_TYPE_SOCKET_FAMILY,
785 G_SOCKET_FAMILY_INVALID,
786 G_PARAM_CONSTRUCT_ONLY |
788 G_PARAM_STATIC_STRINGS));
790 g_object_class_install_property (gobject_class, PROP_TYPE,
791 g_param_spec_enum ("type",
793 P_("The sockets type"),
795 G_SOCKET_TYPE_STREAM,
796 G_PARAM_CONSTRUCT_ONLY |
798 G_PARAM_STATIC_STRINGS));
800 g_object_class_install_property (gobject_class, PROP_PROTOCOL,
801 g_param_spec_enum ("protocol",
802 P_("Socket protocol"),
803 P_("The id of the protocol to use, or -1 for unknown"),
804 G_TYPE_SOCKET_PROTOCOL,
805 G_SOCKET_PROTOCOL_UNKNOWN,
806 G_PARAM_CONSTRUCT_ONLY |
808 G_PARAM_STATIC_STRINGS));
810 g_object_class_install_property (gobject_class, PROP_FD,
811 g_param_spec_int ("fd",
812 P_("File descriptor"),
813 P_("The sockets file descriptor"),
817 G_PARAM_CONSTRUCT_ONLY |
819 G_PARAM_STATIC_STRINGS));
821 g_object_class_install_property (gobject_class, PROP_BLOCKING,
822 g_param_spec_boolean ("blocking",
824 P_("Whether or not I/O on this socket is blocking"),
827 G_PARAM_STATIC_STRINGS));
829 g_object_class_install_property (gobject_class, PROP_LISTEN_BACKLOG,
830 g_param_spec_int ("listen-backlog",
831 P_("Listen backlog"),
832 P_("Outstanding connections in the listen queue"),
837 G_PARAM_STATIC_STRINGS));
839 g_object_class_install_property (gobject_class, PROP_KEEPALIVE,
840 g_param_spec_boolean ("keepalive",
841 P_("Keep connection alive"),
842 P_("Keep connection alive by sending periodic pings"),
845 G_PARAM_STATIC_STRINGS));
847 g_object_class_install_property (gobject_class, PROP_LOCAL_ADDRESS,
848 g_param_spec_object ("local-address",
850 P_("The local address the socket is bound to"),
851 G_TYPE_SOCKET_ADDRESS,
853 G_PARAM_STATIC_STRINGS));
855 g_object_class_install_property (gobject_class, PROP_REMOTE_ADDRESS,
856 g_param_spec_object ("remote-address",
857 P_("Remote address"),
858 P_("The remote address the socket is connected to"),
859 G_TYPE_SOCKET_ADDRESS,
861 G_PARAM_STATIC_STRINGS));
866 * The timeout in seconds on socket I/O
870 g_object_class_install_property (gobject_class, PROP_TIMEOUT,
871 g_param_spec_uint ("timeout",
873 P_("The timeout in seconds on socket I/O"),
878 G_PARAM_STATIC_STRINGS));
883 * Whether the socket should allow sending to and receiving from broadcast addresses.
887 g_object_class_install_property (gobject_class, PROP_BROADCAST,
888 g_param_spec_boolean ("broadcast",
890 P_("Whether to allow sending to and receiving from broadcast addresses"),
893 G_PARAM_STATIC_STRINGS));
898 * Time-to-live for outgoing unicast packets
902 g_object_class_install_property (gobject_class, PROP_TTL,
903 g_param_spec_uint ("ttl",
905 P_("Time-to-live of outgoing unicast packets"),
908 G_PARAM_STATIC_STRINGS));
911 * GSocket:multicast-loopback:
913 * Whether outgoing multicast packets loop back to the local host.
917 g_object_class_install_property (gobject_class, PROP_MULTICAST_LOOPBACK,
918 g_param_spec_boolean ("multicast-loopback",
919 P_("Multicast loopback"),
920 P_("Whether outgoing multicast packets loop back to the local host"),
923 G_PARAM_STATIC_STRINGS));
926 * GSocket:multicast-ttl:
928 * Time-to-live out outgoing multicast packets
932 g_object_class_install_property (gobject_class, PROP_MULTICAST_TTL,
933 g_param_spec_uint ("multicast-ttl",
935 P_("Time-to-live of outgoing multicast packets"),
938 G_PARAM_STATIC_STRINGS));
942 g_socket_initable_iface_init (GInitableIface *iface)
944 iface->init = g_socket_initable_init;
948 g_socket_init (GSocket *socket)
950 socket->priv = G_TYPE_INSTANCE_GET_PRIVATE (socket, G_TYPE_SOCKET, GSocketPrivate);
952 socket->priv->fd = -1;
953 socket->priv->blocking = TRUE;
954 socket->priv->listen_backlog = 10;
955 socket->priv->construct_error = NULL;
957 socket->priv->event = WSA_INVALID_EVENT;
962 g_socket_initable_init (GInitable *initable,
963 GCancellable *cancellable,
968 g_return_val_if_fail (G_IS_SOCKET (initable), FALSE);
970 socket = G_SOCKET (initable);
972 if (cancellable != NULL)
974 g_set_error_literal (error, G_IO_ERROR, G_IO_ERROR_NOT_SUPPORTED,
975 _("Cancellable initialization not supported"));
979 socket->priv->inited = TRUE;
981 if (socket->priv->construct_error)
984 *error = g_error_copy (socket->priv->construct_error);
994 * @family: the socket family to use, e.g. %G_SOCKET_FAMILY_IPV4.
995 * @type: the socket type to use.
996 * @protocol: the id of the protocol to use, or 0 for default.
997 * @error: #GError for error reporting, or %NULL to ignore.
999 * Creates a new #GSocket with the defined family, type and protocol.
1000 * If @protocol is 0 (%G_SOCKET_PROTOCOL_DEFAULT) the default protocol type
1001 * for the family and type is used.
1003 * The @protocol is a family and type specific int that specifies what
1004 * kind of protocol to use. #GSocketProtocol lists several common ones.
1005 * Many families only support one protocol, and use 0 for this, others
1006 * support several and using 0 means to use the default protocol for
1007 * the family and type.
1009 * The protocol id is passed directly to the operating
1010 * system, so you can use protocols not listed in #GSocketProtocol if you
1011 * know the protocol number used for it.
1013 * Returns: a #GSocket or %NULL on error.
1014 * Free the returned object with g_object_unref().
1019 g_socket_new (GSocketFamily family,
1021 GSocketProtocol protocol,
1024 return G_SOCKET (g_initable_new (G_TYPE_SOCKET,
1028 "protocol", protocol,
1033 * g_socket_new_from_fd:
1034 * @fd: a native socket file descriptor.
1035 * @error: #GError for error reporting, or %NULL to ignore.
1037 * Creates a new #GSocket from a native file descriptor
1038 * or winsock SOCKET handle.
1040 * This reads all the settings from the file descriptor so that
1041 * all properties should work. Note that the file descriptor
1042 * will be set to non-blocking mode, independent on the blocking
1043 * mode of the #GSocket.
1045 * Returns: a #GSocket or %NULL on error.
1046 * Free the returned object with g_object_unref().
1051 g_socket_new_from_fd (gint fd,
1054 return G_SOCKET (g_initable_new (G_TYPE_SOCKET,
1061 * g_socket_set_blocking:
1062 * @socket: a #GSocket.
1063 * @blocking: Whether to use blocking I/O or not.
1065 * Sets the blocking mode of the socket. In blocking mode
1066 * all operations block until they succeed or there is an error. In
1067 * non-blocking mode all functions return results immediately or
1068 * with a %G_IO_ERROR_WOULD_BLOCK error.
1070 * All sockets are created in blocking mode. However, note that the
1071 * platform level socket is always non-blocking, and blocking mode
1072 * is a GSocket level feature.
1077 g_socket_set_blocking (GSocket *socket,
1080 g_return_if_fail (G_IS_SOCKET (socket));
1082 blocking = !!blocking;
1084 if (socket->priv->blocking == blocking)
1087 socket->priv->blocking = blocking;
1088 g_object_notify (G_OBJECT (socket), "blocking");
1092 * g_socket_get_blocking:
1093 * @socket: a #GSocket.
1095 * Gets the blocking mode of the socket. For details on blocking I/O,
1096 * see g_socket_set_blocking().
1098 * Returns: %TRUE if blocking I/O is used, %FALSE otherwise.
1103 g_socket_get_blocking (GSocket *socket)
1105 g_return_val_if_fail (G_IS_SOCKET (socket), FALSE);
1107 return socket->priv->blocking;
1111 * g_socket_set_keepalive:
1112 * @socket: a #GSocket.
1113 * @keepalive: Value for the keepalive flag
1115 * Sets or unsets the %SO_KEEPALIVE flag on the underlying socket. When
1116 * this flag is set on a socket, the system will attempt to verify that the
1117 * remote socket endpoint is still present if a sufficiently long period of
1118 * time passes with no data being exchanged. If the system is unable to
1119 * verify the presence of the remote endpoint, it will automatically close
1122 * This option is only functional on certain kinds of sockets. (Notably,
1123 * %G_SOCKET_PROTOCOL_TCP sockets.)
1125 * The exact time between pings is system- and protocol-dependent, but will
1126 * normally be at least two hours. Most commonly, you would set this flag
1127 * on a server socket if you want to allow clients to remain idle for long
1128 * periods of time, but also want to ensure that connections are eventually
1129 * garbage-collected if clients crash or become unreachable.
1134 g_socket_set_keepalive (GSocket *socket,
1137 GError *error = NULL;
1139 g_return_if_fail (G_IS_SOCKET (socket));
1141 keepalive = !!keepalive;
1142 if (socket->priv->keepalive == keepalive)
1145 if (!g_socket_set_option (socket, SOL_SOCKET, SO_KEEPALIVE,
1148 g_warning ("error setting keepalive: %s", error->message);
1149 g_error_free (error);
1153 socket->priv->keepalive = keepalive;
1154 g_object_notify (G_OBJECT (socket), "keepalive");
1158 * g_socket_get_keepalive:
1159 * @socket: a #GSocket.
1161 * Gets the keepalive mode of the socket. For details on this,
1162 * see g_socket_set_keepalive().
1164 * Returns: %TRUE if keepalive is active, %FALSE otherwise.
1169 g_socket_get_keepalive (GSocket *socket)
1171 g_return_val_if_fail (G_IS_SOCKET (socket), FALSE);
1173 return socket->priv->keepalive;
1177 * g_socket_get_listen_backlog:
1178 * @socket: a #GSocket.
1180 * Gets the listen backlog setting of the socket. For details on this,
1181 * see g_socket_set_listen_backlog().
1183 * Returns: the maximum number of pending connections.
1188 g_socket_get_listen_backlog (GSocket *socket)
1190 g_return_val_if_fail (G_IS_SOCKET (socket), 0);
1192 return socket->priv->listen_backlog;
1196 * g_socket_set_listen_backlog:
1197 * @socket: a #GSocket.
1198 * @backlog: the maximum number of pending connections.
1200 * Sets the maximum number of outstanding connections allowed
1201 * when listening on this socket. If more clients than this are
1202 * connecting to the socket and the application is not handling them
1203 * on time then the new connections will be refused.
1205 * Note that this must be called before g_socket_listen() and has no
1206 * effect if called after that.
1211 g_socket_set_listen_backlog (GSocket *socket,
1214 g_return_if_fail (G_IS_SOCKET (socket));
1215 g_return_if_fail (!socket->priv->listening);
1217 if (backlog != socket->priv->listen_backlog)
1219 socket->priv->listen_backlog = backlog;
1220 g_object_notify (G_OBJECT (socket), "listen-backlog");
1225 * g_socket_get_timeout:
1226 * @socket: a #GSocket.
1228 * Gets the timeout setting of the socket. For details on this, see
1229 * g_socket_set_timeout().
1231 * Returns: the timeout in seconds
1236 g_socket_get_timeout (GSocket *socket)
1238 g_return_val_if_fail (G_IS_SOCKET (socket), 0);
1240 return socket->priv->timeout;
1244 * g_socket_set_timeout:
1245 * @socket: a #GSocket.
1246 * @timeout: the timeout for @socket, in seconds, or 0 for none
1248 * Sets the time in seconds after which I/O operations on @socket will
1249 * time out if they have not yet completed.
1251 * On a blocking socket, this means that any blocking #GSocket
1252 * operation will time out after @timeout seconds of inactivity,
1253 * returning %G_IO_ERROR_TIMED_OUT.
1255 * On a non-blocking socket, calls to g_socket_condition_wait() will
1256 * also fail with %G_IO_ERROR_TIMED_OUT after the given time. Sources
1257 * created with g_socket_create_source() will trigger after
1258 * @timeout seconds of inactivity, with the requested condition
1259 * set, at which point calling g_socket_receive(), g_socket_send(),
1260 * g_socket_check_connect_result(), etc, will fail with
1261 * %G_IO_ERROR_TIMED_OUT.
1263 * If @timeout is 0 (the default), operations will never time out
1266 * Note that if an I/O operation is interrupted by a signal, this may
1267 * cause the timeout to be reset.
1272 g_socket_set_timeout (GSocket *socket,
1275 g_return_if_fail (G_IS_SOCKET (socket));
1277 if (timeout != socket->priv->timeout)
1279 socket->priv->timeout = timeout;
1280 g_object_notify (G_OBJECT (socket), "timeout");
1286 * @socket: a #GSocket.
1288 * Gets the unicast time-to-live setting on @socket; see
1289 * g_socket_set_ttl() for more details.
1291 * Returns: the time-to-live setting on @socket
1296 g_socket_get_ttl (GSocket *socket)
1298 GError *error = NULL;
1301 g_return_val_if_fail (G_IS_SOCKET (socket), 0);
1303 if (socket->priv->family == G_SOCKET_FAMILY_IPV4)
1305 g_socket_get_option (socket, IPPROTO_IP, IP_TTL,
1308 else if (socket->priv->family == G_SOCKET_FAMILY_IPV6)
1310 g_socket_get_option (socket, IPPROTO_IPV6, IPV6_UNICAST_HOPS,
1314 g_return_val_if_reached (0);
1318 g_warning ("error getting unicast ttl: %s", error->message);
1319 g_error_free (error);
1328 * @socket: a #GSocket.
1329 * @ttl: the time-to-live value for all unicast packets on @socket
1331 * Sets the time-to-live for outgoing unicast packets on @socket.
1332 * By default the platform-specific default value is used.
1337 g_socket_set_ttl (GSocket *socket,
1340 GError *error = NULL;
1342 g_return_if_fail (G_IS_SOCKET (socket));
1344 if (socket->priv->family == G_SOCKET_FAMILY_IPV4)
1346 g_socket_set_option (socket, IPPROTO_IP, IP_TTL,
1349 else if (socket->priv->family == G_SOCKET_FAMILY_IPV6)
1351 g_socket_set_option (socket, IPPROTO_IPV6, IPV6_UNICAST_HOPS,
1355 g_return_if_reached ();
1359 g_warning ("error setting unicast ttl: %s", error->message);
1360 g_error_free (error);
1364 g_object_notify (G_OBJECT (socket), "ttl");
1368 * g_socket_get_broadcast:
1369 * @socket: a #GSocket.
1371 * Gets the broadcast setting on @socket; if %TRUE,
1372 * it is possible to send packets to broadcast
1373 * addresses or receive from broadcast addresses.
1375 * Returns: the broadcast setting on @socket
1380 g_socket_get_broadcast (GSocket *socket)
1382 GError *error = NULL;
1385 g_return_val_if_fail (G_IS_SOCKET (socket), FALSE);
1387 if (!g_socket_get_option (socket, SOL_SOCKET, SO_BROADCAST,
1390 g_warning ("error getting broadcast: %s", error->message);
1391 g_error_free (error);
1399 * g_socket_set_broadcast:
1400 * @socket: a #GSocket.
1401 * @broadcast: whether @socket should allow sending to and receiving
1402 * from broadcast addresses
1404 * Sets whether @socket should allow sending to and receiving from
1405 * broadcast addresses. This is %FALSE by default.
1410 g_socket_set_broadcast (GSocket *socket,
1413 GError *error = NULL;
1415 g_return_if_fail (G_IS_SOCKET (socket));
1417 broadcast = !!broadcast;
1419 if (!g_socket_set_option (socket, SOL_SOCKET, SO_BROADCAST,
1422 g_warning ("error setting broadcast: %s", error->message);
1423 g_error_free (error);
1427 g_object_notify (G_OBJECT (socket), "broadcast");
1431 * g_socket_get_multicast_loopback:
1432 * @socket: a #GSocket.
1434 * Gets the multicast loopback setting on @socket; if %TRUE (the
1435 * default), outgoing multicast packets will be looped back to
1436 * multicast listeners on the same host.
1438 * Returns: the multicast loopback setting on @socket
1443 g_socket_get_multicast_loopback (GSocket *socket)
1445 GError *error = NULL;
1448 g_return_val_if_fail (G_IS_SOCKET (socket), FALSE);
1450 if (socket->priv->family == G_SOCKET_FAMILY_IPV4)
1452 g_socket_get_option (socket, IPPROTO_IP, IP_MULTICAST_LOOP,
1455 else if (socket->priv->family == G_SOCKET_FAMILY_IPV6)
1457 g_socket_get_option (socket, IPPROTO_IPV6, IPV6_MULTICAST_LOOP,
1461 g_return_val_if_reached (FALSE);
1465 g_warning ("error getting multicast loopback: %s", error->message);
1466 g_error_free (error);
1474 * g_socket_set_multicast_loopback:
1475 * @socket: a #GSocket.
1476 * @loopback: whether @socket should receive messages sent to its
1477 * multicast groups from the local host
1479 * Sets whether outgoing multicast packets will be received by sockets
1480 * listening on that multicast address on the same host. This is %TRUE
1486 g_socket_set_multicast_loopback (GSocket *socket,
1489 GError *error = NULL;
1491 g_return_if_fail (G_IS_SOCKET (socket));
1493 loopback = !!loopback;
1495 if (socket->priv->family == G_SOCKET_FAMILY_IPV4)
1497 g_socket_set_option (socket, IPPROTO_IP, IP_MULTICAST_LOOP,
1500 else if (socket->priv->family == G_SOCKET_FAMILY_IPV6)
1502 g_socket_set_option (socket, IPPROTO_IPV6, IPV6_MULTICAST_LOOP,
1506 g_return_if_reached ();
1510 g_warning ("error setting multicast loopback: %s", error->message);
1511 g_error_free (error);
1515 g_object_notify (G_OBJECT (socket), "multicast-loopback");
1519 * g_socket_get_multicast_ttl:
1520 * @socket: a #GSocket.
1522 * Gets the multicast time-to-live setting on @socket; see
1523 * g_socket_set_multicast_ttl() for more details.
1525 * Returns: the multicast time-to-live setting on @socket
1530 g_socket_get_multicast_ttl (GSocket *socket)
1532 GError *error = NULL;
1535 g_return_val_if_fail (G_IS_SOCKET (socket), FALSE);
1537 if (socket->priv->family == G_SOCKET_FAMILY_IPV4)
1539 g_socket_get_option (socket, IPPROTO_IP, IP_MULTICAST_TTL,
1542 else if (socket->priv->family == G_SOCKET_FAMILY_IPV6)
1544 g_socket_get_option (socket, IPPROTO_IPV6, IPV6_MULTICAST_HOPS,
1548 g_return_val_if_reached (FALSE);
1552 g_warning ("error getting multicast ttl: %s", error->message);
1553 g_error_free (error);
1561 * g_socket_set_multicast_ttl:
1562 * @socket: a #GSocket.
1563 * @ttl: the time-to-live value for all multicast datagrams on @socket
1565 * Sets the time-to-live for outgoing multicast datagrams on @socket.
1566 * By default, this is 1, meaning that multicast packets will not leave
1567 * the local network.
1572 g_socket_set_multicast_ttl (GSocket *socket,
1575 GError *error = NULL;
1577 g_return_if_fail (G_IS_SOCKET (socket));
1579 if (socket->priv->family == G_SOCKET_FAMILY_IPV4)
1581 g_socket_set_option (socket, IPPROTO_IP, IP_MULTICAST_TTL,
1584 else if (socket->priv->family == G_SOCKET_FAMILY_IPV6)
1586 g_socket_set_option (socket, IPPROTO_IPV6, IPV6_MULTICAST_HOPS,
1590 g_return_if_reached ();
1594 g_warning ("error setting multicast ttl: %s", error->message);
1595 g_error_free (error);
1599 g_object_notify (G_OBJECT (socket), "multicast-ttl");
1603 * g_socket_get_family:
1604 * @socket: a #GSocket.
1606 * Gets the socket family of the socket.
1608 * Returns: a #GSocketFamily
1613 g_socket_get_family (GSocket *socket)
1615 g_return_val_if_fail (G_IS_SOCKET (socket), G_SOCKET_FAMILY_INVALID);
1617 return socket->priv->family;
1621 * g_socket_get_socket_type:
1622 * @socket: a #GSocket.
1624 * Gets the socket type of the socket.
1626 * Returns: a #GSocketType
1631 g_socket_get_socket_type (GSocket *socket)
1633 g_return_val_if_fail (G_IS_SOCKET (socket), G_SOCKET_TYPE_INVALID);
1635 return socket->priv->type;
1639 * g_socket_get_protocol:
1640 * @socket: a #GSocket.
1642 * Gets the socket protocol id the socket was created with.
1643 * In case the protocol is unknown, -1 is returned.
1645 * Returns: a protocol id, or -1 if unknown
1650 g_socket_get_protocol (GSocket *socket)
1652 g_return_val_if_fail (G_IS_SOCKET (socket), -1);
1654 return socket->priv->protocol;
1659 * @socket: a #GSocket.
1661 * Returns the underlying OS socket object. On unix this
1662 * is a socket file descriptor, and on Windows this is
1663 * a Winsock2 SOCKET handle. This may be useful for
1664 * doing platform specific or otherwise unusual operations
1667 * Returns: the file descriptor of the socket.
1672 g_socket_get_fd (GSocket *socket)
1674 g_return_val_if_fail (G_IS_SOCKET (socket), -1);
1676 return socket->priv->fd;
1680 * g_socket_get_local_address:
1681 * @socket: a #GSocket.
1682 * @error: #GError for error reporting, or %NULL to ignore.
1684 * Try to get the local address of a bound socket. This is only
1685 * useful if the socket has been bound to a local address,
1686 * either explicitly or implicitly when connecting.
1688 * Returns: (transfer full): a #GSocketAddress or %NULL on error.
1689 * Free the returned object with g_object_unref().
1694 g_socket_get_local_address (GSocket *socket,
1697 struct sockaddr_storage buffer;
1698 guint len = sizeof (buffer);
1700 g_return_val_if_fail (G_IS_SOCKET (socket), NULL);
1702 if (getsockname (socket->priv->fd, (struct sockaddr *) &buffer, &len) < 0)
1704 int errsv = get_socket_errno ();
1705 g_set_error (error, G_IO_ERROR, socket_io_error_from_errno (errsv),
1706 _("could not get local address: %s"), socket_strerror (errsv));
1710 return g_socket_address_new_from_native (&buffer, len);
1714 * g_socket_get_remote_address:
1715 * @socket: a #GSocket.
1716 * @error: #GError for error reporting, or %NULL to ignore.
1718 * Try to get the remove address of a connected socket. This is only
1719 * useful for connection oriented sockets that have been connected.
1721 * Returns: (transfer full): a #GSocketAddress or %NULL on error.
1722 * Free the returned object with g_object_unref().
1727 g_socket_get_remote_address (GSocket *socket,
1730 struct sockaddr_storage buffer;
1731 guint len = sizeof (buffer);
1733 g_return_val_if_fail (G_IS_SOCKET (socket), NULL);
1735 if (socket->priv->connect_pending)
1737 if (!g_socket_check_connect_result (socket, error))
1740 socket->priv->connect_pending = FALSE;
1743 if (!socket->priv->remote_address)
1745 if (getpeername (socket->priv->fd, (struct sockaddr *) &buffer, &len) < 0)
1747 int errsv = get_socket_errno ();
1748 g_set_error (error, G_IO_ERROR, socket_io_error_from_errno (errsv),
1749 _("could not get remote address: %s"), socket_strerror (errsv));
1753 socket->priv->remote_address = g_socket_address_new_from_native (&buffer, len);
1756 return g_object_ref (socket->priv->remote_address);
1760 * g_socket_is_connected:
1761 * @socket: a #GSocket.
1763 * Check whether the socket is connected. This is only useful for
1764 * connection-oriented sockets.
1766 * Returns: %TRUE if socket is connected, %FALSE otherwise.
1771 g_socket_is_connected (GSocket *socket)
1773 g_return_val_if_fail (G_IS_SOCKET (socket), FALSE);
1775 return socket->priv->connected;
1780 * @socket: a #GSocket.
1781 * @error: #GError for error reporting, or %NULL to ignore.
1783 * Marks the socket as a server socket, i.e. a socket that is used
1784 * to accept incoming requests using g_socket_accept().
1786 * Before calling this the socket must be bound to a local address using
1789 * To set the maximum amount of outstanding clients, use
1790 * g_socket_set_listen_backlog().
1792 * Returns: %TRUE on success, %FALSE on error.
1797 g_socket_listen (GSocket *socket,
1800 g_return_val_if_fail (G_IS_SOCKET (socket), FALSE);
1802 if (!check_socket (socket, error))
1805 if (listen (socket->priv->fd, socket->priv->listen_backlog) < 0)
1807 int errsv = get_socket_errno ();
1809 g_set_error (error, G_IO_ERROR, socket_io_error_from_errno (errsv),
1810 _("could not listen: %s"), socket_strerror (errsv));
1814 socket->priv->listening = TRUE;
1821 * @socket: a #GSocket.
1822 * @address: a #GSocketAddress specifying the local address.
1823 * @allow_reuse: whether to allow reusing this address
1824 * @error: #GError for error reporting, or %NULL to ignore.
1826 * When a socket is created it is attached to an address family, but it
1827 * doesn't have an address in this family. g_socket_bind() assigns the
1828 * address (sometimes called name) of the socket.
1830 * It is generally required to bind to a local address before you can
1831 * receive connections. (See g_socket_listen() and g_socket_accept() ).
1832 * In certain situations, you may also want to bind a socket that will be
1833 * used to initiate connections, though this is not normally required.
1835 * @allow_reuse should be %TRUE for server sockets (sockets that you will
1836 * eventually call g_socket_accept() on), and %FALSE for client sockets.
1837 * (Specifically, if it is %TRUE, then g_socket_bind() will set the
1838 * %SO_REUSEADDR flag on the socket, allowing it to bind @address even if
1839 * that address was previously used by another socket that has not yet been
1840 * fully cleaned-up by the kernel. Failing to set this flag on a server
1841 * socket may cause the bind call to return %G_IO_ERROR_ADDRESS_IN_USE if
1842 * the server program is stopped and then immediately restarted.)
1844 * Returns: %TRUE on success, %FALSE on error.
1849 g_socket_bind (GSocket *socket,
1850 GSocketAddress *address,
1851 gboolean reuse_address,
1854 struct sockaddr_storage addr;
1856 g_return_val_if_fail (G_IS_SOCKET (socket) && G_IS_SOCKET_ADDRESS (address), FALSE);
1858 if (!check_socket (socket, error))
1861 /* SO_REUSEADDR on Windows means something else and is not what we want.
1862 It always allows the unix variant of SO_REUSEADDR anyway */
1865 reuse_address = !!reuse_address;
1866 /* Ignore errors here, the only likely error is "not supported", and
1867 this is a "best effort" thing mainly */
1868 g_socket_set_option (socket, SOL_SOCKET, SO_REUSEADDR,
1869 reuse_address, NULL);
1873 if (!g_socket_address_to_native (address, &addr, sizeof addr, error))
1876 if (bind (socket->priv->fd, (struct sockaddr *) &addr,
1877 g_socket_address_get_native_size (address)) < 0)
1879 int errsv = get_socket_errno ();
1881 G_IO_ERROR, socket_io_error_from_errno (errsv),
1882 _("Error binding to address: %s"), socket_strerror (errsv));
1890 g_socket_multicast_group_operation (GSocket *socket,
1891 GInetAddress *group,
1892 gboolean source_specific,
1894 gboolean join_group,
1897 const guint8 *native_addr;
1898 gint optname, result;
1900 g_return_val_if_fail (G_IS_SOCKET (socket), FALSE);
1901 g_return_val_if_fail (socket->priv->type == G_SOCKET_TYPE_DATAGRAM, FALSE);
1902 g_return_val_if_fail (G_IS_INET_ADDRESS (group), FALSE);
1903 g_return_val_if_fail (g_inet_address_get_family (group) == socket->priv->family, FALSE);
1905 if (!check_socket (socket, error))
1908 native_addr = g_inet_address_to_bytes (group);
1909 if (socket->priv->family == G_SOCKET_FAMILY_IPV4)
1911 #ifdef HAVE_IP_MREQN
1912 struct ip_mreqn mc_req;
1914 struct ip_mreq mc_req;
1917 memset (&mc_req, 0, sizeof (mc_req));
1918 memcpy (&mc_req.imr_multiaddr, native_addr, sizeof (struct in_addr));
1920 #ifdef HAVE_IP_MREQN
1922 mc_req.imr_ifindex = if_nametoindex (iface);
1924 mc_req.imr_ifindex = 0; /* Pick any. */
1926 mc_req.imr_interface.s_addr = g_htonl (INADDR_ANY);
1929 if (source_specific)
1931 #ifdef IP_ADD_SOURCE_MEMBERSHIP
1932 optname = join_group ? IP_ADD_SOURCE_MEMBERSHIP : IP_DROP_SOURCE_MEMBERSHIP;
1934 g_set_error (error, G_IO_ERROR, G_IO_ERROR_NOT_SUPPORTED,
1936 _("Error joining multicast group: %s") :
1937 _("Error leaving multicast group: %s"),
1938 _("No support for source-specific multicast"));
1943 optname = join_group ? IP_ADD_MEMBERSHIP : IP_DROP_MEMBERSHIP;
1944 result = setsockopt (socket->priv->fd, IPPROTO_IP, optname,
1945 &mc_req, sizeof (mc_req));
1947 else if (socket->priv->family == G_SOCKET_FAMILY_IPV6)
1949 struct ipv6_mreq mc_req_ipv6;
1951 memset (&mc_req_ipv6, 0, sizeof (mc_req_ipv6));
1952 memcpy (&mc_req_ipv6.ipv6mr_multiaddr, native_addr, sizeof (struct in6_addr));
1953 #ifdef HAVE_IF_NAMETOINDEX
1955 mc_req_ipv6.ipv6mr_interface = if_nametoindex (iface);
1958 mc_req_ipv6.ipv6mr_interface = 0;
1960 optname = join_group ? IPV6_JOIN_GROUP : IPV6_LEAVE_GROUP;
1961 result = setsockopt (socket->priv->fd, IPPROTO_IPV6, optname,
1962 &mc_req_ipv6, sizeof (mc_req_ipv6));
1965 g_return_val_if_reached (FALSE);
1969 int errsv = get_socket_errno ();
1971 g_set_error (error, G_IO_ERROR, socket_io_error_from_errno (errsv),
1973 _("Error joining multicast group: %s") :
1974 _("Error leaving multicast group: %s"),
1975 socket_strerror (errsv));
1983 * g_socket_join_multicast_group:
1984 * @socket: a #GSocket.
1985 * @group: a #GInetAddress specifying the group address to join.
1986 * @iface: (allow-none): Name of the interface to use, or %NULL
1987 * @source_specific: %TRUE if source-specific multicast should be used
1988 * @error: #GError for error reporting, or %NULL to ignore.
1990 * Registers @socket to receive multicast messages sent to @group.
1991 * @socket must be a %G_SOCKET_TYPE_DATAGRAM socket, and must have
1992 * been bound to an appropriate interface and port with
1995 * If @iface is %NULL, the system will automatically pick an interface
1996 * to bind to based on @group.
1998 * If @source_specific is %TRUE, source-specific multicast as defined
1999 * in RFC 4604 is used. Note that on older platforms this may fail
2000 * with a %G_IO_ERROR_NOT_SUPPORTED error.
2002 * Returns: %TRUE on success, %FALSE on error.
2007 g_socket_join_multicast_group (GSocket *socket,
2008 GInetAddress *group,
2009 gboolean source_specific,
2013 return g_socket_multicast_group_operation (socket, group, source_specific, iface, TRUE, error);
2017 * g_socket_leave_multicast_group:
2018 * @socket: a #GSocket.
2019 * @group: a #GInetAddress specifying the group address to leave.
2020 * @iface: (allow-none): Interface used
2021 * @source_specific: %TRUE if source-specific multicast was used
2022 * @error: #GError for error reporting, or %NULL to ignore.
2024 * Removes @socket from the multicast group defined by @group, @iface,
2025 * and @source_specific (which must all have the same values they had
2026 * when you joined the group).
2028 * @socket remains bound to its address and port, and can still receive
2029 * unicast messages after calling this.
2031 * Returns: %TRUE on success, %FALSE on error.
2036 g_socket_leave_multicast_group (GSocket *socket,
2037 GInetAddress *group,
2038 gboolean source_specific,
2042 return g_socket_multicast_group_operation (socket, group, source_specific, iface, FALSE, error);
2046 * g_socket_speaks_ipv4:
2047 * @socket: a #GSocket
2049 * Checks if a socket is capable of speaking IPv4.
2051 * IPv4 sockets are capable of speaking IPv4. On some operating systems
2052 * and under some combinations of circumstances IPv6 sockets are also
2053 * capable of speaking IPv4. See RFC 3493 section 3.7 for more
2056 * No other types of sockets are currently considered as being capable
2059 * Returns: %TRUE if this socket can be used with IPv4.
2064 g_socket_speaks_ipv4 (GSocket *socket)
2066 switch (socket->priv->family)
2068 case G_SOCKET_FAMILY_IPV4:
2071 case G_SOCKET_FAMILY_IPV6:
2072 #if defined (IPPROTO_IPV6) && defined (IPV6_V6ONLY)
2076 if (!g_socket_get_option (socket,
2077 IPPROTO_IPV6, IPV6_V6ONLY,
2094 * @socket: a #GSocket.
2095 * @cancellable: (allow-none): a %GCancellable or %NULL
2096 * @error: #GError for error reporting, or %NULL to ignore.
2098 * Accept incoming connections on a connection-based socket. This removes
2099 * the first outstanding connection request from the listening socket and
2100 * creates a #GSocket object for it.
2102 * The @socket must be bound to a local address with g_socket_bind() and
2103 * must be listening for incoming connections (g_socket_listen()).
2105 * If there are no outstanding connections then the operation will block
2106 * or return %G_IO_ERROR_WOULD_BLOCK if non-blocking I/O is enabled.
2107 * To be notified of an incoming connection, wait for the %G_IO_IN condition.
2109 * Returns: (transfer full): a new #GSocket, or %NULL on error.
2110 * Free the returned object with g_object_unref().
2115 g_socket_accept (GSocket *socket,
2116 GCancellable *cancellable,
2119 GSocket *new_socket;
2122 g_return_val_if_fail (G_IS_SOCKET (socket), NULL);
2124 if (!check_socket (socket, error))
2129 if (socket->priv->blocking &&
2130 !g_socket_condition_wait (socket,
2131 G_IO_IN, cancellable, error))
2134 if ((ret = accept (socket->priv->fd, NULL, 0)) < 0)
2136 int errsv = get_socket_errno ();
2138 win32_unset_event_mask (socket, FD_ACCEPT);
2143 if (socket->priv->blocking)
2145 #ifdef WSAEWOULDBLOCK
2146 if (errsv == WSAEWOULDBLOCK)
2149 if (errsv == EWOULDBLOCK ||
2155 g_set_error (error, G_IO_ERROR,
2156 socket_io_error_from_errno (errsv),
2157 _("Error accepting connection: %s"), socket_strerror (errsv));
2163 win32_unset_event_mask (socket, FD_ACCEPT);
2167 /* The socket inherits the accepting sockets event mask and even object,
2168 we need to remove that */
2169 WSAEventSelect (ret, NULL, 0);
2175 /* We always want to set close-on-exec to protect users. If you
2176 need to so some weird inheritance to exec you can re-enable this
2177 using lower level hacks with g_socket_get_fd(). */
2178 flags = fcntl (ret, F_GETFD, 0);
2180 (flags & FD_CLOEXEC) == 0)
2182 flags |= FD_CLOEXEC;
2183 fcntl (ret, F_SETFD, flags);
2188 new_socket = g_socket_new_from_fd (ret, error);
2189 if (new_socket == NULL)
2198 new_socket->priv->protocol = socket->priv->protocol;
2205 * @socket: a #GSocket.
2206 * @address: a #GSocketAddress specifying the remote address.
2207 * @cancellable: (allow-none): a %GCancellable or %NULL
2208 * @error: #GError for error reporting, or %NULL to ignore.
2210 * Connect the socket to the specified remote address.
2212 * For connection oriented socket this generally means we attempt to make
2213 * a connection to the @address. For a connection-less socket it sets
2214 * the default address for g_socket_send() and discards all incoming datagrams
2215 * from other sources.
2217 * Generally connection oriented sockets can only connect once, but
2218 * connection-less sockets can connect multiple times to change the
2221 * If the connect call needs to do network I/O it will block, unless
2222 * non-blocking I/O is enabled. Then %G_IO_ERROR_PENDING is returned
2223 * and the user can be notified of the connection finishing by waiting
2224 * for the G_IO_OUT condition. The result of the connection must then be
2225 * checked with g_socket_check_connect_result().
2227 * Returns: %TRUE if connected, %FALSE on error.
2232 g_socket_connect (GSocket *socket,
2233 GSocketAddress *address,
2234 GCancellable *cancellable,
2237 struct sockaddr_storage buffer;
2239 g_return_val_if_fail (G_IS_SOCKET (socket) && G_IS_SOCKET_ADDRESS (address), FALSE);
2241 if (!check_socket (socket, error))
2244 if (!g_socket_address_to_native (address, &buffer, sizeof buffer, error))
2247 if (socket->priv->remote_address)
2248 g_object_unref (socket->priv->remote_address);
2249 socket->priv->remote_address = g_object_ref (address);
2253 if (connect (socket->priv->fd, (struct sockaddr *) &buffer,
2254 g_socket_address_get_native_size (address)) < 0)
2256 int errsv = get_socket_errno ();
2262 if (errsv == EINPROGRESS)
2264 if (errsv == WSAEWOULDBLOCK)
2267 if (socket->priv->blocking)
2269 if (g_socket_condition_wait (socket, G_IO_OUT, cancellable, error))
2271 if (g_socket_check_connect_result (socket, error))
2277 g_set_error_literal (error, G_IO_ERROR, G_IO_ERROR_PENDING,
2278 _("Connection in progress"));
2279 socket->priv->connect_pending = TRUE;
2283 g_set_error_literal (error, G_IO_ERROR,
2284 socket_io_error_from_errno (errsv),
2285 socket_strerror (errsv));
2292 win32_unset_event_mask (socket, FD_CONNECT);
2294 socket->priv->connected = TRUE;
2300 * g_socket_check_connect_result:
2301 * @socket: a #GSocket
2302 * @error: #GError for error reporting, or %NULL to ignore.
2304 * Checks and resets the pending connect error for the socket.
2305 * This is used to check for errors when g_socket_connect() is
2306 * used in non-blocking mode.
2308 * Returns: %TRUE if no error, %FALSE otherwise, setting @error to the error
2313 g_socket_check_connect_result (GSocket *socket,
2318 g_return_val_if_fail (G_IS_SOCKET (socket), FALSE);
2320 if (!check_socket (socket, error))
2323 if (!g_socket_get_option (socket, SOL_SOCKET, SO_ERROR, &value, error))
2325 g_prefix_error (error, _("Unable to get pending error: "));
2331 g_set_error_literal (error, G_IO_ERROR, socket_io_error_from_errno (value),
2332 socket_strerror (value));
2333 if (socket->priv->remote_address)
2335 g_object_unref (socket->priv->remote_address);
2336 socket->priv->remote_address = NULL;
2341 socket->priv->connected = TRUE;
2346 * g_socket_get_available_bytes:
2347 * @socket: a #GSocket
2349 * Get the amount of data pending in the OS input buffer.
2351 * Returns: the number of bytes that can be read from the socket
2352 * without blocking or -1 on error.
2357 g_socket_get_available_bytes (GSocket *socket)
2361 g_return_val_if_fail (G_IS_SOCKET (socket), -1);
2364 if (ioctl (socket->priv->fd, FIONREAD, &avail) < 0)
2367 if (ioctlsocket (socket->priv->fd, FIONREAD, &avail) == SOCKET_ERROR)
2376 * @socket: a #GSocket
2377 * @buffer: a buffer to read data into (which should be at least @size
2379 * @size: the number of bytes you want to read from the socket
2380 * @cancellable: (allow-none): a %GCancellable or %NULL
2381 * @error: #GError for error reporting, or %NULL to ignore.
2383 * Receive data (up to @size bytes) from a socket. This is mainly used by
2384 * connection-oriented sockets; it is identical to g_socket_receive_from()
2385 * with @address set to %NULL.
2387 * For %G_SOCKET_TYPE_DATAGRAM and %G_SOCKET_TYPE_SEQPACKET sockets,
2388 * g_socket_receive() will always read either 0 or 1 complete messages from
2389 * the socket. If the received message is too large to fit in @buffer, then
2390 * the data beyond @size bytes will be discarded, without any explicit
2391 * indication that this has occurred.
2393 * For %G_SOCKET_TYPE_STREAM sockets, g_socket_receive() can return any
2394 * number of bytes, up to @size. If more than @size bytes have been
2395 * received, the additional data will be returned in future calls to
2396 * g_socket_receive().
2398 * If the socket is in blocking mode the call will block until there
2399 * is some data to receive, the connection is closed, or there is an
2400 * error. If there is no data available and the socket is in
2401 * non-blocking mode, a %G_IO_ERROR_WOULD_BLOCK error will be
2402 * returned. To be notified when data is available, wait for the
2403 * %G_IO_IN condition.
2405 * On error -1 is returned and @error is set accordingly.
2407 * Returns: Number of bytes read, or 0 if the connection was closed by
2408 * the peer, or -1 on error
2413 g_socket_receive (GSocket *socket,
2416 GCancellable *cancellable,
2419 return g_socket_receive_with_blocking (socket, buffer, size,
2420 socket->priv->blocking,
2421 cancellable, error);
2425 * g_socket_receive_with_blocking:
2426 * @socket: a #GSocket
2427 * @buffer: a buffer to read data into (which should be at least @size
2429 * @size: the number of bytes you want to read from the socket
2430 * @blocking: whether to do blocking or non-blocking I/O
2431 * @cancellable: (allow-none): a %GCancellable or %NULL
2432 * @error: #GError for error reporting, or %NULL to ignore.
2434 * This behaves exactly the same as g_socket_receive(), except that
2435 * the choice of blocking or non-blocking behavior is determined by
2436 * the @blocking argument rather than by @socket's properties.
2438 * Returns: Number of bytes read, or 0 if the connection was closed by
2439 * the peer, or -1 on error
2444 g_socket_receive_with_blocking (GSocket *socket,
2448 GCancellable *cancellable,
2453 g_return_val_if_fail (G_IS_SOCKET (socket) && buffer != NULL, -1);
2455 if (!check_socket (socket, error))
2458 if (g_cancellable_set_error_if_cancelled (cancellable, error))
2464 !g_socket_condition_wait (socket,
2465 G_IO_IN, cancellable, error))
2468 if ((ret = recv (socket->priv->fd, buffer, size, 0)) < 0)
2470 int errsv = get_socket_errno ();
2477 #ifdef WSAEWOULDBLOCK
2478 if (errsv == WSAEWOULDBLOCK)
2481 if (errsv == EWOULDBLOCK ||
2487 win32_unset_event_mask (socket, FD_READ);
2489 g_set_error (error, G_IO_ERROR,
2490 socket_io_error_from_errno (errsv),
2491 _("Error receiving data: %s"), socket_strerror (errsv));
2495 win32_unset_event_mask (socket, FD_READ);
2504 * g_socket_receive_from:
2505 * @socket: a #GSocket
2506 * @address: (out) (allow-none): a pointer to a #GSocketAddress
2508 * @buffer: (array length=size) (element-type guint8): a buffer to
2509 * read data into (which should be at least @size bytes long).
2510 * @size: the number of bytes you want to read from the socket
2511 * @cancellable: (allow-none): a %GCancellable or %NULL
2512 * @error: #GError for error reporting, or %NULL to ignore.
2514 * Receive data (up to @size bytes) from a socket.
2516 * If @address is non-%NULL then @address will be set equal to the
2517 * source address of the received packet.
2518 * @address is owned by the caller.
2520 * See g_socket_receive() for additional information.
2522 * Returns: Number of bytes read, or 0 if the connection was closed by
2523 * the peer, or -1 on error
2528 g_socket_receive_from (GSocket *socket,
2529 GSocketAddress **address,
2532 GCancellable *cancellable,
2540 return g_socket_receive_message (socket,
2548 /* Although we ignore SIGPIPE, gdb will still stop if the app receives
2549 * one, which can be confusing and annoying. So if possible, we want
2550 * to suppress the signal entirely.
2553 #define G_SOCKET_DEFAULT_SEND_FLAGS MSG_NOSIGNAL
2555 #define G_SOCKET_DEFAULT_SEND_FLAGS 0
2560 * @socket: a #GSocket
2561 * @buffer: (array length=size) (element-type guint8): the buffer
2562 * containing the data to send.
2563 * @size: the number of bytes to send
2564 * @cancellable: (allow-none): a %GCancellable or %NULL
2565 * @error: #GError for error reporting, or %NULL to ignore.
2567 * Tries to send @size bytes from @buffer on the socket. This is
2568 * mainly used by connection-oriented sockets; it is identical to
2569 * g_socket_send_to() with @address set to %NULL.
2571 * If the socket is in blocking mode the call will block until there is
2572 * space for the data in the socket queue. If there is no space available
2573 * and the socket is in non-blocking mode a %G_IO_ERROR_WOULD_BLOCK error
2574 * will be returned. To be notified when space is available, wait for the
2575 * %G_IO_OUT condition. Note though that you may still receive
2576 * %G_IO_ERROR_WOULD_BLOCK from g_socket_send() even if you were previously
2577 * notified of a %G_IO_OUT condition. (On Windows in particular, this is
2578 * very common due to the way the underlying APIs work.)
2580 * On error -1 is returned and @error is set accordingly.
2582 * Returns: Number of bytes written (which may be less than @size), or -1
2588 g_socket_send (GSocket *socket,
2589 const gchar *buffer,
2591 GCancellable *cancellable,
2594 return g_socket_send_with_blocking (socket, buffer, size,
2595 socket->priv->blocking,
2596 cancellable, error);
2600 * g_socket_send_with_blocking:
2601 * @socket: a #GSocket
2602 * @buffer: (array length=size) (element-type guint8): the buffer
2603 * containing the data to send.
2604 * @size: the number of bytes to send
2605 * @blocking: whether to do blocking or non-blocking I/O
2606 * @cancellable: (allow-none): a %GCancellable or %NULL
2607 * @error: #GError for error reporting, or %NULL to ignore.
2609 * This behaves exactly the same as g_socket_send(), except that
2610 * the choice of blocking or non-blocking behavior is determined by
2611 * the @blocking argument rather than by @socket's properties.
2613 * Returns: Number of bytes written (which may be less than @size), or -1
2619 g_socket_send_with_blocking (GSocket *socket,
2620 const gchar *buffer,
2623 GCancellable *cancellable,
2628 g_return_val_if_fail (G_IS_SOCKET (socket) && buffer != NULL, -1);
2630 if (!check_socket (socket, error))
2633 if (g_cancellable_set_error_if_cancelled (cancellable, error))
2639 !g_socket_condition_wait (socket,
2640 G_IO_OUT, cancellable, error))
2643 if ((ret = send (socket->priv->fd, buffer, size, G_SOCKET_DEFAULT_SEND_FLAGS)) < 0)
2645 int errsv = get_socket_errno ();
2650 #ifdef WSAEWOULDBLOCK
2651 if (errsv == WSAEWOULDBLOCK)
2652 win32_unset_event_mask (socket, FD_WRITE);
2657 #ifdef WSAEWOULDBLOCK
2658 if (errsv == WSAEWOULDBLOCK)
2661 if (errsv == EWOULDBLOCK ||
2667 g_set_error (error, G_IO_ERROR,
2668 socket_io_error_from_errno (errsv),
2669 _("Error sending data: %s"), socket_strerror (errsv));
2680 * @socket: a #GSocket
2681 * @address: (allow-none): a #GSocketAddress, or %NULL
2682 * @buffer: (array length=size) (element-type guint8): the buffer
2683 * containing the data to send.
2684 * @size: the number of bytes to send
2685 * @cancellable: (allow-none): a %GCancellable or %NULL
2686 * @error: #GError for error reporting, or %NULL to ignore.
2688 * Tries to send @size bytes from @buffer to @address. If @address is
2689 * %NULL then the message is sent to the default receiver (set by
2690 * g_socket_connect()).
2692 * See g_socket_send() for additional information.
2694 * Returns: Number of bytes written (which may be less than @size), or -1
2700 g_socket_send_to (GSocket *socket,
2701 GSocketAddress *address,
2702 const gchar *buffer,
2704 GCancellable *cancellable,
2712 return g_socket_send_message (socket,
2722 * g_socket_shutdown:
2723 * @socket: a #GSocket
2724 * @shutdown_read: whether to shut down the read side
2725 * @shutdown_write: whether to shut down the write side
2726 * @error: #GError for error reporting, or %NULL to ignore.
2728 * Shut down part of a full-duplex connection.
2730 * If @shutdown_read is %TRUE then the receiving side of the connection
2731 * is shut down, and further reading is disallowed.
2733 * If @shutdown_write is %TRUE then the sending side of the connection
2734 * is shut down, and further writing is disallowed.
2736 * It is allowed for both @shutdown_read and @shutdown_write to be %TRUE.
2738 * One example where this is used is graceful disconnect for TCP connections
2739 * where you close the sending side, then wait for the other side to close
2740 * the connection, thus ensuring that the other side saw all sent data.
2742 * Returns: %TRUE on success, %FALSE on error
2747 g_socket_shutdown (GSocket *socket,
2748 gboolean shutdown_read,
2749 gboolean shutdown_write,
2754 g_return_val_if_fail (G_IS_SOCKET (socket), TRUE);
2756 if (!check_socket (socket, error))
2760 if (!shutdown_read && !shutdown_write)
2764 if (shutdown_read && shutdown_write)
2766 else if (shutdown_read)
2771 if (shutdown_read && shutdown_write)
2773 else if (shutdown_read)
2779 if (shutdown (socket->priv->fd, how) != 0)
2781 int errsv = get_socket_errno ();
2782 g_set_error (error, G_IO_ERROR, socket_io_error_from_errno (errsv),
2783 _("Unable to shutdown socket: %s"), socket_strerror (errsv));
2787 if (shutdown_read && shutdown_write)
2788 socket->priv->connected = FALSE;
2795 * @socket: a #GSocket
2796 * @error: #GError for error reporting, or %NULL to ignore.
2798 * Closes the socket, shutting down any active connection.
2800 * Closing a socket does not wait for all outstanding I/O operations
2801 * to finish, so the caller should not rely on them to be guaranteed
2802 * to complete even if the close returns with no error.
2804 * Once the socket is closed, all other operations will return
2805 * %G_IO_ERROR_CLOSED. Closing a socket multiple times will not
2808 * Sockets will be automatically closed when the last reference
2809 * is dropped, but you might want to call this function to make sure
2810 * resources are released as early as possible.
2812 * Beware that due to the way that TCP works, it is possible for
2813 * recently-sent data to be lost if either you close a socket while the
2814 * %G_IO_IN condition is set, or else if the remote connection tries to
2815 * send something to you after you close the socket but before it has
2816 * finished reading all of the data you sent. There is no easy generic
2817 * way to avoid this problem; the easiest fix is to design the network
2818 * protocol such that the client will never send data "out of turn".
2819 * Another solution is for the server to half-close the connection by
2820 * calling g_socket_shutdown() with only the @shutdown_write flag set,
2821 * and then wait for the client to notice this and close its side of the
2822 * connection, after which the server can safely call g_socket_close().
2823 * (This is what #GTcpConnection does if you call
2824 * g_tcp_connection_set_graceful_disconnect(). But of course, this
2825 * only works if the client will close its connection after the server
2828 * Returns: %TRUE on success, %FALSE on error
2833 g_socket_close (GSocket *socket,
2838 g_return_val_if_fail (G_IS_SOCKET (socket), TRUE);
2840 if (socket->priv->closed)
2841 return TRUE; /* Multiple close not an error */
2843 if (!check_socket (socket, error))
2849 res = closesocket (socket->priv->fd);
2851 res = close (socket->priv->fd);
2855 int errsv = get_socket_errno ();
2860 g_set_error (error, G_IO_ERROR,
2861 socket_io_error_from_errno (errsv),
2862 _("Error closing socket: %s"),
2863 socket_strerror (errsv));
2869 socket->priv->connected = FALSE;
2870 socket->priv->closed = TRUE;
2871 if (socket->priv->remote_address)
2873 g_object_unref (socket->priv->remote_address);
2874 socket->priv->remote_address = NULL;
2881 * g_socket_is_closed:
2882 * @socket: a #GSocket
2884 * Checks whether a socket is closed.
2886 * Returns: %TRUE if socket is closed, %FALSE otherwise
2891 g_socket_is_closed (GSocket *socket)
2893 return socket->priv->closed;
2897 /* Broken source, used on errors */
2899 broken_prepare (GSource *source,
2906 broken_check (GSource *source)
2912 broken_dispatch (GSource *source,
2913 GSourceFunc callback,
2919 static GSourceFuncs broken_funcs =
2928 network_events_for_condition (GIOCondition condition)
2932 if (condition & G_IO_IN)
2933 event_mask |= (FD_READ | FD_ACCEPT);
2934 if (condition & G_IO_OUT)
2935 event_mask |= (FD_WRITE | FD_CONNECT);
2936 event_mask |= FD_CLOSE;
2942 ensure_event (GSocket *socket)
2944 if (socket->priv->event == WSA_INVALID_EVENT)
2945 socket->priv->event = WSACreateEvent();
2949 update_select_events (GSocket *socket)
2956 ensure_event (socket);
2959 for (l = socket->priv->requested_conditions; l != NULL; l = l->next)
2962 event_mask |= network_events_for_condition (*ptr);
2965 if (event_mask != socket->priv->selected_events)
2967 /* If no events selected, disable event so we can unset
2970 if (event_mask == 0)
2973 event = socket->priv->event;
2975 if (WSAEventSelect (socket->priv->fd, event, event_mask) == 0)
2976 socket->priv->selected_events = event_mask;
2981 add_condition_watch (GSocket *socket,
2982 GIOCondition *condition)
2984 g_assert (g_list_find (socket->priv->requested_conditions, condition) == NULL);
2986 socket->priv->requested_conditions =
2987 g_list_prepend (socket->priv->requested_conditions, condition);
2989 update_select_events (socket);
2993 remove_condition_watch (GSocket *socket,
2994 GIOCondition *condition)
2996 g_assert (g_list_find (socket->priv->requested_conditions, condition) != NULL);
2998 socket->priv->requested_conditions =
2999 g_list_remove (socket->priv->requested_conditions, condition);
3001 update_select_events (socket);
3005 update_condition (GSocket *socket)
3007 WSANETWORKEVENTS events;
3008 GIOCondition condition;
3010 if (WSAEnumNetworkEvents (socket->priv->fd,
3011 socket->priv->event,
3014 socket->priv->current_events |= events.lNetworkEvents;
3015 if (events.lNetworkEvents & FD_WRITE &&
3016 events.iErrorCode[FD_WRITE_BIT] != 0)
3017 socket->priv->current_errors |= FD_WRITE;
3018 if (events.lNetworkEvents & FD_CONNECT &&
3019 events.iErrorCode[FD_CONNECT_BIT] != 0)
3020 socket->priv->current_errors |= FD_CONNECT;
3024 if (socket->priv->current_events & (FD_READ | FD_ACCEPT))
3025 condition |= G_IO_IN;
3027 if (socket->priv->current_events & FD_CLOSE)
3029 int r, errsv, buffer;
3031 r = recv (socket->priv->fd, &buffer, sizeof (buffer), MSG_PEEK);
3033 errsv = get_socket_errno ();
3036 (r < 0 && errsv == WSAENOTCONN))
3037 condition |= G_IO_IN;
3039 (r < 0 && (errsv == WSAESHUTDOWN || errsv == WSAECONNRESET ||
3040 errsv == WSAECONNABORTED || errsv == WSAENETRESET)))
3041 condition |= G_IO_HUP;
3043 condition |= G_IO_ERR;
3046 if (socket->priv->closed)
3047 condition |= G_IO_HUP;
3049 /* Never report both G_IO_OUT and HUP, these are
3050 mutually exclusive (can't write to a closed socket) */
3051 if ((condition & G_IO_HUP) == 0 &&
3052 socket->priv->current_events & FD_WRITE)
3054 if (socket->priv->current_errors & FD_WRITE)
3055 condition |= G_IO_ERR;
3057 condition |= G_IO_OUT;
3061 if (socket->priv->current_events & FD_CONNECT)
3063 if (socket->priv->current_errors & FD_CONNECT)
3064 condition |= (G_IO_HUP | G_IO_ERR);
3066 condition |= G_IO_OUT;
3078 GIOCondition condition;
3079 GCancellable *cancellable;
3080 GPollFD cancel_pollfd;
3081 gint64 timeout_time;
3085 socket_source_prepare (GSource *source,
3088 GSocketSource *socket_source = (GSocketSource *)source;
3090 if (g_cancellable_is_cancelled (socket_source->cancellable))
3093 if (socket_source->timeout_time)
3097 now = g_source_get_time (source);
3098 /* Round up to ensure that we don't try again too early */
3099 *timeout = (socket_source->timeout_time - now + 999) / 1000;
3102 socket_source->socket->priv->timed_out = TRUE;
3111 socket_source->pollfd.revents = update_condition (socket_source->socket);
3114 if ((socket_source->condition & socket_source->pollfd.revents) != 0)
3121 socket_source_check (GSource *source)
3125 return socket_source_prepare (source, &timeout);
3129 socket_source_dispatch (GSource *source,
3130 GSourceFunc callback,
3133 GSocketSourceFunc func = (GSocketSourceFunc)callback;
3134 GSocketSource *socket_source = (GSocketSource *)source;
3135 GSocket *socket = socket_source->socket;
3139 socket_source->pollfd.revents = update_condition (socket_source->socket);
3141 if (socket_source->socket->priv->timed_out)
3142 socket_source->pollfd.revents |= socket_source->condition & (G_IO_IN | G_IO_OUT);
3144 ret = (*func) (socket,
3145 socket_source->pollfd.revents & socket_source->condition,
3148 if (socket->priv->timeout)
3149 socket_source->timeout_time = g_get_monotonic_time () +
3150 socket->priv->timeout * 1000000;
3153 socket_source->timeout_time = 0;
3159 socket_source_finalize (GSource *source)
3161 GSocketSource *socket_source = (GSocketSource *)source;
3164 socket = socket_source->socket;
3167 remove_condition_watch (socket, &socket_source->condition);
3170 g_object_unref (socket);
3172 if (socket_source->cancellable)
3174 g_cancellable_release_fd (socket_source->cancellable);
3175 g_object_unref (socket_source->cancellable);
3180 socket_source_closure_callback (GSocket *socket,
3181 GIOCondition condition,
3184 GClosure *closure = data;
3186 GValue params[2] = { G_VALUE_INIT, G_VALUE_INIT };
3187 GValue result_value = G_VALUE_INIT;
3190 g_value_init (&result_value, G_TYPE_BOOLEAN);
3192 g_value_init (¶ms[0], G_TYPE_SOCKET);
3193 g_value_set_object (¶ms[0], socket);
3194 g_value_init (¶ms[1], G_TYPE_IO_CONDITION);
3195 g_value_set_flags (¶ms[1], condition);
3197 g_closure_invoke (closure, &result_value, 2, params, NULL);
3199 result = g_value_get_boolean (&result_value);
3200 g_value_unset (&result_value);
3201 g_value_unset (¶ms[0]);
3202 g_value_unset (¶ms[1]);
3207 static GSourceFuncs socket_source_funcs =
3209 socket_source_prepare,
3210 socket_source_check,
3211 socket_source_dispatch,
3212 socket_source_finalize,
3213 (GSourceFunc)socket_source_closure_callback,
3214 (GSourceDummyMarshal)g_cclosure_marshal_generic,
3218 socket_source_new (GSocket *socket,
3219 GIOCondition condition,
3220 GCancellable *cancellable)
3223 GSocketSource *socket_source;
3226 ensure_event (socket);
3228 if (socket->priv->event == WSA_INVALID_EVENT)
3230 g_warning ("Failed to create WSAEvent");
3231 return g_source_new (&broken_funcs, sizeof (GSource));
3235 condition |= G_IO_HUP | G_IO_ERR;
3237 source = g_source_new (&socket_source_funcs, sizeof (GSocketSource));
3238 g_source_set_name (source, "GSocket");
3239 socket_source = (GSocketSource *)source;
3241 socket_source->socket = g_object_ref (socket);
3242 socket_source->condition = condition;
3244 if (g_cancellable_make_pollfd (cancellable,
3245 &socket_source->cancel_pollfd))
3247 socket_source->cancellable = g_object_ref (cancellable);
3248 g_source_add_poll (source, &socket_source->cancel_pollfd);
3252 add_condition_watch (socket, &socket_source->condition);
3253 socket_source->pollfd.fd = (gintptr) socket->priv->event;
3255 socket_source->pollfd.fd = socket->priv->fd;
3258 socket_source->pollfd.events = condition;
3259 socket_source->pollfd.revents = 0;
3260 g_source_add_poll (source, &socket_source->pollfd);
3262 if (socket->priv->timeout)
3263 socket_source->timeout_time = g_get_monotonic_time () +
3264 socket->priv->timeout * 1000000;
3267 socket_source->timeout_time = 0;
3273 * g_socket_create_source: (skip)
3274 * @socket: a #GSocket
3275 * @condition: a #GIOCondition mask to monitor
3276 * @cancellable: (allow-none): a %GCancellable or %NULL
3278 * Creates a %GSource that can be attached to a %GMainContext to monitor
3279 * for the availibility of the specified @condition on the socket.
3281 * The callback on the source is of the #GSocketSourceFunc type.
3283 * It is meaningless to specify %G_IO_ERR or %G_IO_HUP in @condition;
3284 * these conditions will always be reported output if they are true.
3286 * @cancellable if not %NULL can be used to cancel the source, which will
3287 * cause the source to trigger, reporting the current condition (which
3288 * is likely 0 unless cancellation happened at the same time as a
3289 * condition change). You can check for this in the callback using
3290 * g_cancellable_is_cancelled().
3292 * If @socket has a timeout set, and it is reached before @condition
3293 * occurs, the source will then trigger anyway, reporting %G_IO_IN or
3294 * %G_IO_OUT depending on @condition. However, @socket will have been
3295 * marked as having had a timeout, and so the next #GSocket I/O method
3296 * you call will then fail with a %G_IO_ERROR_TIMED_OUT.
3298 * Returns: (transfer full): a newly allocated %GSource, free with g_source_unref().
3303 g_socket_create_source (GSocket *socket,
3304 GIOCondition condition,
3305 GCancellable *cancellable)
3307 g_return_val_if_fail (G_IS_SOCKET (socket) && (cancellable == NULL || G_IS_CANCELLABLE (cancellable)), NULL);
3309 return socket_source_new (socket, condition, cancellable);
3313 * g_socket_condition_check:
3314 * @socket: a #GSocket
3315 * @condition: a #GIOCondition mask to check
3317 * Checks on the readiness of @socket to perform operations.
3318 * The operations specified in @condition are checked for and masked
3319 * against the currently-satisfied conditions on @socket. The result
3322 * Note that on Windows, it is possible for an operation to return
3323 * %G_IO_ERROR_WOULD_BLOCK even immediately after
3324 * g_socket_condition_check() has claimed that the socket is ready for
3325 * writing. Rather than calling g_socket_condition_check() and then
3326 * writing to the socket if it succeeds, it is generally better to
3327 * simply try writing to the socket right away, and try again later if
3328 * the initial attempt returns %G_IO_ERROR_WOULD_BLOCK.
3330 * It is meaningless to specify %G_IO_ERR or %G_IO_HUP in condition;
3331 * these conditions will always be set in the output if they are true.
3333 * This call never blocks.
3335 * Returns: the @GIOCondition mask of the current state
3340 g_socket_condition_check (GSocket *socket,
3341 GIOCondition condition)
3343 g_return_val_if_fail (G_IS_SOCKET (socket), 0);
3345 if (!check_socket (socket, NULL))
3350 GIOCondition current_condition;
3352 condition |= G_IO_ERR | G_IO_HUP;
3354 add_condition_watch (socket, &condition);
3355 current_condition = update_condition (socket);
3356 remove_condition_watch (socket, &condition);
3357 return condition & current_condition;
3363 poll_fd.fd = socket->priv->fd;
3364 poll_fd.events = condition;
3365 poll_fd.revents = 0;
3368 result = g_poll (&poll_fd, 1, 0);
3369 while (result == -1 && get_socket_errno () == EINTR);
3371 return poll_fd.revents;
3377 * g_socket_condition_wait:
3378 * @socket: a #GSocket
3379 * @condition: a #GIOCondition mask to wait for
3380 * @cancellable: (allow-none): a #GCancellable, or %NULL
3381 * @error: a #GError pointer, or %NULL
3383 * Waits for @condition to become true on @socket. When the condition
3384 * is met, %TRUE is returned.
3386 * If @cancellable is cancelled before the condition is met, or if the
3387 * socket has a timeout set and it is reached before the condition is
3388 * met, then %FALSE is returned and @error, if non-%NULL, is set to
3389 * the appropriate value (%G_IO_ERROR_CANCELLED or
3390 * %G_IO_ERROR_TIMED_OUT).
3392 * See also g_socket_condition_timed_wait().
3394 * Returns: %TRUE if the condition was met, %FALSE otherwise
3399 g_socket_condition_wait (GSocket *socket,
3400 GIOCondition condition,
3401 GCancellable *cancellable,
3404 g_return_val_if_fail (G_IS_SOCKET (socket), FALSE);
3406 return g_socket_condition_timed_wait (socket, condition, -1,
3407 cancellable, error);
3411 * g_socket_condition_timed_wait:
3412 * @socket: a #GSocket
3413 * @condition: a #GIOCondition mask to wait for
3414 * @timeout: the maximum time (in microseconds) to wait, or -1
3415 * @cancellable: (allow-none): a #GCancellable, or %NULL
3416 * @error: a #GError pointer, or %NULL
3418 * Waits for up to @timeout microseconds for @condition to become true
3419 * on @socket. If the condition is met, %TRUE is returned.
3421 * If @cancellable is cancelled before the condition is met, or if
3422 * @timeout (or the socket's #GSocket:timeout) is reached before the
3423 * condition is met, then %FALSE is returned and @error, if non-%NULL,
3424 * is set to the appropriate value (%G_IO_ERROR_CANCELLED or
3425 * %G_IO_ERROR_TIMED_OUT).
3427 * If you don't want a timeout, use g_socket_condition_wait().
3428 * (Alternatively, you can pass -1 for @timeout.)
3430 * Note that although @timeout is in microseconds for consistency with
3431 * other GLib APIs, this function actually only has millisecond
3432 * resolution, and the behavior is undefined if @timeout is not an
3433 * exact number of milliseconds.
3435 * Returns: %TRUE if the condition was met, %FALSE otherwise
3440 g_socket_condition_timed_wait (GSocket *socket,
3441 GIOCondition condition,
3443 GCancellable *cancellable,
3448 g_return_val_if_fail (G_IS_SOCKET (socket), FALSE);
3450 if (!check_socket (socket, error))
3453 if (g_cancellable_set_error_if_cancelled (cancellable, error))
3456 if (socket->priv->timeout &&
3457 (timeout < 0 || socket->priv->timeout < timeout / G_USEC_PER_SEC))
3458 timeout = socket->priv->timeout * 1000;
3459 else if (timeout != -1)
3460 timeout = timeout / 1000;
3462 start_time = g_get_monotonic_time ();
3466 GIOCondition current_condition;
3472 /* Always check these */
3473 condition |= G_IO_ERR | G_IO_HUP;
3475 add_condition_watch (socket, &condition);
3478 events[num_events++] = socket->priv->event;
3480 if (g_cancellable_make_pollfd (cancellable, &cancel_fd))
3481 events[num_events++] = (WSAEVENT)cancel_fd.fd;
3484 timeout = WSA_INFINITE;
3486 current_condition = update_condition (socket);
3487 while ((condition & current_condition) == 0)
3489 res = WSAWaitForMultipleEvents (num_events, events,
3490 FALSE, timeout, FALSE);
3491 if (res == WSA_WAIT_FAILED)
3493 int errsv = get_socket_errno ();
3495 g_set_error (error, G_IO_ERROR,
3496 socket_io_error_from_errno (errsv),
3497 _("Waiting for socket condition: %s"),
3498 socket_strerror (errsv));
3501 else if (res == WSA_WAIT_TIMEOUT)
3503 g_set_error_literal (error, G_IO_ERROR, G_IO_ERROR_TIMED_OUT,
3504 _("Socket I/O timed out"));
3508 if (g_cancellable_set_error_if_cancelled (cancellable, error))
3511 current_condition = update_condition (socket);
3513 if (timeout != WSA_INFINITE)
3515 timeout -= (g_get_monotonic_time () - start_time) * 1000;
3520 remove_condition_watch (socket, &condition);
3522 g_cancellable_release_fd (cancellable);
3524 return (condition & current_condition) != 0;
3532 poll_fd[0].fd = socket->priv->fd;
3533 poll_fd[0].events = condition;
3536 if (g_cancellable_make_pollfd (cancellable, &poll_fd[1]))
3541 result = g_poll (poll_fd, num, timeout);
3542 if (result != -1 || errno != EINTR)
3547 timeout -= (g_get_monotonic_time () - start_time) * 1000;
3554 g_cancellable_release_fd (cancellable);
3558 g_set_error_literal (error, G_IO_ERROR, G_IO_ERROR_TIMED_OUT,
3559 _("Socket I/O timed out"));
3563 return !g_cancellable_set_error_if_cancelled (cancellable, error);
3569 * g_socket_send_message:
3570 * @socket: a #GSocket
3571 * @address: (allow-none): a #GSocketAddress, or %NULL
3572 * @vectors: (array length=num_vectors): an array of #GOutputVector structs
3573 * @num_vectors: the number of elements in @vectors, or -1
3574 * @messages: (array length=num_messages) (allow-none): a pointer to an
3575 * array of #GSocketControlMessages, or %NULL.
3576 * @num_messages: number of elements in @messages, or -1.
3577 * @flags: an int containing #GSocketMsgFlags flags
3578 * @cancellable: (allow-none): a %GCancellable or %NULL
3579 * @error: #GError for error reporting, or %NULL to ignore.
3581 * Send data to @address on @socket. This is the most complicated and
3582 * fully-featured version of this call. For easier use, see
3583 * g_socket_send() and g_socket_send_to().
3585 * If @address is %NULL then the message is sent to the default receiver
3586 * (set by g_socket_connect()).
3588 * @vectors must point to an array of #GOutputVector structs and
3589 * @num_vectors must be the length of this array. (If @num_vectors is -1,
3590 * then @vectors is assumed to be terminated by a #GOutputVector with a
3591 * %NULL buffer pointer.) The #GOutputVector structs describe the buffers
3592 * that the sent data will be gathered from. Using multiple
3593 * #GOutputVector<!-- -->s is more memory-efficient than manually copying
3594 * data from multiple sources into a single buffer, and more
3595 * network-efficient than making multiple calls to g_socket_send().
3597 * @messages, if non-%NULL, is taken to point to an array of @num_messages
3598 * #GSocketControlMessage instances. These correspond to the control
3599 * messages to be sent on the socket.
3600 * If @num_messages is -1 then @messages is treated as a %NULL-terminated
3603 * @flags modify how the message is sent. The commonly available arguments
3604 * for this are available in the #GSocketMsgFlags enum, but the
3605 * values there are the same as the system values, and the flags
3606 * are passed in as-is, so you can pass in system-specific flags too.
3608 * If the socket is in blocking mode the call will block until there is
3609 * space for the data in the socket queue. If there is no space available
3610 * and the socket is in non-blocking mode a %G_IO_ERROR_WOULD_BLOCK error
3611 * will be returned. To be notified when space is available, wait for the
3612 * %G_IO_OUT condition. Note though that you may still receive
3613 * %G_IO_ERROR_WOULD_BLOCK from g_socket_send() even if you were previously
3614 * notified of a %G_IO_OUT condition. (On Windows in particular, this is
3615 * very common due to the way the underlying APIs work.)
3617 * On error -1 is returned and @error is set accordingly.
3619 * Returns: Number of bytes written (which may be less than @size), or -1
3625 g_socket_send_message (GSocket *socket,
3626 GSocketAddress *address,
3627 GOutputVector *vectors,
3629 GSocketControlMessage **messages,
3632 GCancellable *cancellable,
3635 GOutputVector one_vector;
3638 g_return_val_if_fail (G_IS_SOCKET (socket), -1);
3640 if (!check_socket (socket, error))
3643 if (g_cancellable_set_error_if_cancelled (cancellable, error))
3646 if (num_vectors == -1)
3648 for (num_vectors = 0;
3649 vectors[num_vectors].buffer != NULL;
3654 if (num_messages == -1)
3656 for (num_messages = 0;
3657 messages != NULL && messages[num_messages] != NULL;
3662 if (num_vectors == 0)
3666 one_vector.buffer = &zero;
3667 one_vector.size = 1;
3669 vectors = &one_vector;
3682 msg.msg_namelen = g_socket_address_get_native_size (address);
3683 msg.msg_name = g_alloca (msg.msg_namelen);
3684 if (!g_socket_address_to_native (address, msg.msg_name, msg.msg_namelen, error))
3689 msg.msg_name = NULL;
3690 msg.msg_namelen = 0;
3695 /* this entire expression will be evaluated at compile time */
3696 if (sizeof *msg.msg_iov == sizeof *vectors &&
3697 sizeof msg.msg_iov->iov_base == sizeof vectors->buffer &&
3698 G_STRUCT_OFFSET (struct iovec, iov_base) ==
3699 G_STRUCT_OFFSET (GOutputVector, buffer) &&
3700 sizeof msg.msg_iov->iov_len == sizeof vectors->size &&
3701 G_STRUCT_OFFSET (struct iovec, iov_len) ==
3702 G_STRUCT_OFFSET (GOutputVector, size))
3703 /* ABI is compatible */
3705 msg.msg_iov = (struct iovec *) vectors;
3706 msg.msg_iovlen = num_vectors;
3709 /* ABI is incompatible */
3713 msg.msg_iov = g_newa (struct iovec, num_vectors);
3714 for (i = 0; i < num_vectors; i++)
3716 msg.msg_iov[i].iov_base = (void *) vectors[i].buffer;
3717 msg.msg_iov[i].iov_len = vectors[i].size;
3719 msg.msg_iovlen = num_vectors;
3725 struct cmsghdr *cmsg;
3728 msg.msg_controllen = 0;
3729 for (i = 0; i < num_messages; i++)
3730 msg.msg_controllen += CMSG_SPACE (g_socket_control_message_get_size (messages[i]));
3732 if (msg.msg_controllen == 0)
3733 msg.msg_control = NULL;
3736 msg.msg_control = g_alloca (msg.msg_controllen);
3737 memset (msg.msg_control, '\0', msg.msg_controllen);
3740 cmsg = CMSG_FIRSTHDR (&msg);
3741 for (i = 0; i < num_messages; i++)
3743 cmsg->cmsg_level = g_socket_control_message_get_level (messages[i]);
3744 cmsg->cmsg_type = g_socket_control_message_get_msg_type (messages[i]);
3745 cmsg->cmsg_len = CMSG_LEN (g_socket_control_message_get_size (messages[i]));
3746 g_socket_control_message_serialize (messages[i],
3748 cmsg = CMSG_NXTHDR (&msg, cmsg);
3750 g_assert (cmsg == NULL);
3755 if (socket->priv->blocking &&
3756 !g_socket_condition_wait (socket,
3757 G_IO_OUT, cancellable, error))
3760 result = sendmsg (socket->priv->fd, &msg, flags | G_SOCKET_DEFAULT_SEND_FLAGS);
3763 int errsv = get_socket_errno ();
3768 if (socket->priv->blocking &&
3769 (errsv == EWOULDBLOCK ||
3773 g_set_error (error, G_IO_ERROR,
3774 socket_io_error_from_errno (errsv),
3775 _("Error sending message: %s"), socket_strerror (errsv));
3786 struct sockaddr_storage addr;
3793 /* Win32 doesn't support control messages.
3794 Actually this is possible for raw and datagram sockets
3795 via WSASendMessage on Vista or later, but that doesn't
3797 if (num_messages != 0)
3799 g_set_error_literal (error, G_IO_ERROR, G_IO_ERROR_NOT_SUPPORTED,
3800 _("GSocketControlMessage not supported on Windows"));
3805 bufs = g_newa (WSABUF, num_vectors);
3806 for (i = 0; i < num_vectors; i++)
3808 bufs[i].buf = (char *)vectors[i].buffer;
3809 bufs[i].len = (gulong)vectors[i].size;
3813 addrlen = 0; /* Avoid warning */
3816 addrlen = g_socket_address_get_native_size (address);
3817 if (!g_socket_address_to_native (address, &addr, sizeof addr, error))
3823 if (socket->priv->blocking &&
3824 !g_socket_condition_wait (socket,
3825 G_IO_OUT, cancellable, error))
3829 result = WSASendTo (socket->priv->fd,
3832 (const struct sockaddr *)&addr, addrlen,
3835 result = WSASend (socket->priv->fd,
3842 int errsv = get_socket_errno ();
3844 if (errsv == WSAEINTR)
3847 if (errsv == WSAEWOULDBLOCK)
3848 win32_unset_event_mask (socket, FD_WRITE);
3850 if (socket->priv->blocking &&
3851 errsv == WSAEWOULDBLOCK)
3854 g_set_error (error, G_IO_ERROR,
3855 socket_io_error_from_errno (errsv),
3856 _("Error sending message: %s"), socket_strerror (errsv));
3868 static GSocketAddress *
3869 cache_recv_address (GSocket *socket, struct sockaddr *native, int native_len)
3871 GSocketAddress *saddr;
3873 guint64 oldest_time = G_MAXUINT64;
3874 gint oldest_index = 0;
3876 if (native_len <= 0)
3880 for (i = 0; i < RECV_ADDR_CACHE_SIZE; i++)
3882 GSocketAddress *tmp = socket->priv->recv_addr_cache[i].addr;
3883 gpointer tmp_native = socket->priv->recv_addr_cache[i].native;
3884 gint tmp_native_len = socket->priv->recv_addr_cache[i].native_len;
3889 if (tmp_native_len != native_len)
3892 if (memcmp (tmp_native, native, native_len) == 0)
3894 saddr = g_object_ref (tmp);
3895 socket->priv->recv_addr_cache[i].last_used = g_get_monotonic_time ();
3899 if (socket->priv->recv_addr_cache[i].last_used < oldest_time)
3901 oldest_time = socket->priv->recv_addr_cache[i].last_used;
3906 saddr = g_socket_address_new_from_native (native, native_len);
3908 if (socket->priv->recv_addr_cache[oldest_index].addr)
3910 g_object_unref (socket->priv->recv_addr_cache[oldest_index].addr);
3911 g_free (socket->priv->recv_addr_cache[oldest_index].native);
3914 socket->priv->recv_addr_cache[oldest_index].native = g_memdup (native, native_len);
3915 socket->priv->recv_addr_cache[oldest_index].native_len = native_len;
3916 socket->priv->recv_addr_cache[oldest_index].addr = g_object_ref (saddr);
3917 socket->priv->recv_addr_cache[oldest_index].last_used = g_get_monotonic_time ();
3923 * g_socket_receive_message:
3924 * @socket: a #GSocket
3925 * @address: (out) (allow-none): a pointer to a #GSocketAddress
3927 * @vectors: (array length=num_vectors): an array of #GInputVector structs
3928 * @num_vectors: the number of elements in @vectors, or -1
3929 * @messages: (array length=num_messages) (allow-none): a pointer which
3930 * may be filled with an array of #GSocketControlMessages, or %NULL
3931 * @num_messages: a pointer which will be filled with the number of
3932 * elements in @messages, or %NULL
3933 * @flags: a pointer to an int containing #GSocketMsgFlags flags
3934 * @cancellable: (allow-none): a %GCancellable or %NULL
3935 * @error: a #GError pointer, or %NULL
3937 * Receive data from a socket. This is the most complicated and
3938 * fully-featured version of this call. For easier use, see
3939 * g_socket_receive() and g_socket_receive_from().
3941 * If @address is non-%NULL then @address will be set equal to the
3942 * source address of the received packet.
3943 * @address is owned by the caller.
3945 * @vector must point to an array of #GInputVector structs and
3946 * @num_vectors must be the length of this array. These structs
3947 * describe the buffers that received data will be scattered into.
3948 * If @num_vectors is -1, then @vectors is assumed to be terminated
3949 * by a #GInputVector with a %NULL buffer pointer.
3951 * As a special case, if @num_vectors is 0 (in which case, @vectors
3952 * may of course be %NULL), then a single byte is received and
3953 * discarded. This is to facilitate the common practice of sending a
3954 * single '\0' byte for the purposes of transferring ancillary data.
3956 * @messages, if non-%NULL, will be set to point to a newly-allocated
3957 * array of #GSocketControlMessage instances or %NULL if no such
3958 * messages was received. These correspond to the control messages
3959 * received from the kernel, one #GSocketControlMessage per message
3960 * from the kernel. This array is %NULL-terminated and must be freed
3961 * by the caller using g_free() after calling g_object_unref() on each
3962 * element. If @messages is %NULL, any control messages received will
3965 * @num_messages, if non-%NULL, will be set to the number of control
3966 * messages received.
3968 * If both @messages and @num_messages are non-%NULL, then
3969 * @num_messages gives the number of #GSocketControlMessage instances
3970 * in @messages (ie: not including the %NULL terminator).
3972 * @flags is an in/out parameter. The commonly available arguments
3973 * for this are available in the #GSocketMsgFlags enum, but the
3974 * values there are the same as the system values, and the flags
3975 * are passed in as-is, so you can pass in system-specific flags too
3976 * (and g_socket_receive_message() may pass system-specific flags out).
3978 * As with g_socket_receive(), data may be discarded if @socket is
3979 * %G_SOCKET_TYPE_DATAGRAM or %G_SOCKET_TYPE_SEQPACKET and you do not
3980 * provide enough buffer space to read a complete message. You can pass
3981 * %G_SOCKET_MSG_PEEK in @flags to peek at the current message without
3982 * removing it from the receive queue, but there is no portable way to find
3983 * out the length of the message other than by reading it into a
3984 * sufficiently-large buffer.
3986 * If the socket is in blocking mode the call will block until there
3987 * is some data to receive, the connection is closed, or there is an
3988 * error. If there is no data available and the socket is in
3989 * non-blocking mode, a %G_IO_ERROR_WOULD_BLOCK error will be
3990 * returned. To be notified when data is available, wait for the
3991 * %G_IO_IN condition.
3993 * On error -1 is returned and @error is set accordingly.
3995 * Returns: Number of bytes read, or 0 if the connection was closed by
3996 * the peer, or -1 on error
4001 g_socket_receive_message (GSocket *socket,
4002 GSocketAddress **address,
4003 GInputVector *vectors,
4005 GSocketControlMessage ***messages,
4008 GCancellable *cancellable,
4011 GInputVector one_vector;
4014 g_return_val_if_fail (G_IS_SOCKET (socket), -1);
4016 if (!check_socket (socket, error))
4019 if (g_cancellable_set_error_if_cancelled (cancellable, error))
4022 if (num_vectors == -1)
4024 for (num_vectors = 0;
4025 vectors[num_vectors].buffer != NULL;
4030 if (num_vectors == 0)
4032 one_vector.buffer = &one_byte;
4033 one_vector.size = 1;
4035 vectors = &one_vector;
4042 struct sockaddr_storage one_sockaddr;
4047 msg.msg_name = &one_sockaddr;
4048 msg.msg_namelen = sizeof (struct sockaddr_storage);
4052 msg.msg_name = NULL;
4053 msg.msg_namelen = 0;
4057 /* this entire expression will be evaluated at compile time */
4058 if (sizeof *msg.msg_iov == sizeof *vectors &&
4059 sizeof msg.msg_iov->iov_base == sizeof vectors->buffer &&
4060 G_STRUCT_OFFSET (struct iovec, iov_base) ==
4061 G_STRUCT_OFFSET (GInputVector, buffer) &&
4062 sizeof msg.msg_iov->iov_len == sizeof vectors->size &&
4063 G_STRUCT_OFFSET (struct iovec, iov_len) ==
4064 G_STRUCT_OFFSET (GInputVector, size))
4065 /* ABI is compatible */
4067 msg.msg_iov = (struct iovec *) vectors;
4068 msg.msg_iovlen = num_vectors;
4071 /* ABI is incompatible */
4075 msg.msg_iov = g_newa (struct iovec, num_vectors);
4076 for (i = 0; i < num_vectors; i++)
4078 msg.msg_iov[i].iov_base = vectors[i].buffer;
4079 msg.msg_iov[i].iov_len = vectors[i].size;
4081 msg.msg_iovlen = num_vectors;
4085 msg.msg_control = g_alloca (2048);
4086 msg.msg_controllen = 2048;
4090 msg.msg_flags = *flags;
4094 /* We always set the close-on-exec flag so we don't leak file
4095 * descriptors into child processes. Note that gunixfdmessage.c
4096 * will later call fcntl (fd, FD_CLOEXEC), but that isn't atomic.
4098 #ifdef MSG_CMSG_CLOEXEC
4099 msg.msg_flags |= MSG_CMSG_CLOEXEC;
4105 if (socket->priv->blocking &&
4106 !g_socket_condition_wait (socket,
4107 G_IO_IN, cancellable, error))
4110 result = recvmsg (socket->priv->fd, &msg, msg.msg_flags);
4111 #ifdef MSG_CMSG_CLOEXEC
4112 if (result < 0 && get_socket_errno () == EINVAL)
4114 /* We must be running on an old kernel. Call without the flag. */
4115 msg.msg_flags &= ~(MSG_CMSG_CLOEXEC);
4116 result = recvmsg (socket->priv->fd, &msg, msg.msg_flags);
4122 int errsv = get_socket_errno ();
4127 if (socket->priv->blocking &&
4128 (errsv == EWOULDBLOCK ||
4132 g_set_error (error, G_IO_ERROR,
4133 socket_io_error_from_errno (errsv),
4134 _("Error receiving message: %s"), socket_strerror (errsv));
4141 /* decode address */
4142 if (address != NULL)
4144 *address = cache_recv_address (socket, msg.msg_name, msg.msg_namelen);
4147 /* decode control messages */
4149 GPtrArray *my_messages = NULL;
4150 struct cmsghdr *cmsg;
4152 for (cmsg = CMSG_FIRSTHDR (&msg); cmsg; cmsg = CMSG_NXTHDR (&msg, cmsg))
4154 GSocketControlMessage *message;
4156 message = g_socket_control_message_deserialize (cmsg->cmsg_level,
4158 cmsg->cmsg_len - ((char *)CMSG_DATA (cmsg) - (char *)cmsg),
4160 if (message == NULL)
4161 /* We've already spewed about the problem in the
4162 deserialization code, so just continue */
4165 if (messages == NULL)
4167 /* we have to do it this way if the user ignores the
4168 * messages so that we will close any received fds.
4170 g_object_unref (message);
4174 if (my_messages == NULL)
4175 my_messages = g_ptr_array_new ();
4176 g_ptr_array_add (my_messages, message);
4181 *num_messages = my_messages != NULL ? my_messages->len : 0;
4185 if (my_messages == NULL)
4191 g_ptr_array_add (my_messages, NULL);
4192 *messages = (GSocketControlMessage **) g_ptr_array_free (my_messages, FALSE);
4197 g_assert (my_messages == NULL);
4201 /* capture the flags */
4203 *flags = msg.msg_flags;
4209 struct sockaddr_storage addr;
4211 DWORD bytes_received;
4218 bufs = g_newa (WSABUF, num_vectors);
4219 for (i = 0; i < num_vectors; i++)
4221 bufs[i].buf = (char *)vectors[i].buffer;
4222 bufs[i].len = (gulong)vectors[i].size;
4234 if (socket->priv->blocking &&
4235 !g_socket_condition_wait (socket,
4236 G_IO_IN, cancellable, error))
4239 addrlen = sizeof addr;
4241 result = WSARecvFrom (socket->priv->fd,
4243 &bytes_received, &win_flags,
4244 (struct sockaddr *)&addr, &addrlen,
4247 result = WSARecv (socket->priv->fd,
4249 &bytes_received, &win_flags,
4253 int errsv = get_socket_errno ();
4255 if (errsv == WSAEINTR)
4258 win32_unset_event_mask (socket, FD_READ);
4260 if (socket->priv->blocking &&
4261 errsv == WSAEWOULDBLOCK)
4264 g_set_error (error, G_IO_ERROR,
4265 socket_io_error_from_errno (errsv),
4266 _("Error receiving message: %s"), socket_strerror (errsv));
4270 win32_unset_event_mask (socket, FD_READ);
4274 /* decode address */
4275 if (address != NULL)
4277 *address = cache_recv_address (socket, (struct sockaddr *)&addr, addrlen);
4280 /* capture the flags */
4284 if (messages != NULL)
4286 if (num_messages != NULL)
4289 return bytes_received;
4295 * g_socket_get_credentials:
4296 * @socket: a #GSocket.
4297 * @error: #GError for error reporting, or %NULL to ignore.
4299 * Returns the credentials of the foreign process connected to this
4300 * socket, if any (e.g. it is only supported for %G_SOCKET_FAMILY_UNIX
4303 * If this operation isn't supported on the OS, the method fails with
4304 * the %G_IO_ERROR_NOT_SUPPORTED error. On Linux this is implemented
4305 * by reading the %SO_PEERCRED option on the underlying socket.
4307 * Other ways to obtain credentials from a foreign peer includes the
4308 * #GUnixCredentialsMessage type and
4309 * g_unix_connection_send_credentials() /
4310 * g_unix_connection_receive_credentials() functions.
4312 * Returns: (transfer full): %NULL if @error is set, otherwise a #GCredentials object
4313 * that must be freed with g_object_unref().
4318 g_socket_get_credentials (GSocket *socket,
4323 g_return_val_if_fail (G_IS_SOCKET (socket), NULL);
4324 g_return_val_if_fail (error == NULL || *error == NULL, NULL);
4328 #if defined(__linux__) || defined(__OpenBSD__)
4331 #if defined(__linux__)
4332 struct ucred native_creds;
4333 optlen = sizeof (struct ucred);
4334 #elif defined(__OpenBSD__)
4335 struct sockpeercred native_creds;
4336 optlen = sizeof (struct sockpeercred);
4338 if (getsockopt (socket->priv->fd,
4341 (void *)&native_creds,
4344 int errsv = get_socket_errno ();
4347 socket_io_error_from_errno (errsv),
4348 _("Unable to get pending error: %s"),
4349 socket_strerror (errsv));
4353 ret = g_credentials_new ();
4354 g_credentials_set_native (ret,
4355 #if defined(__linux__)
4356 G_CREDENTIALS_TYPE_LINUX_UCRED,
4357 #elif defined(__OpenBSD__)
4358 G_CREDENTIALS_TYPE_OPENBSD_SOCKPEERCRED,
4364 g_set_error_literal (error,
4366 G_IO_ERROR_NOT_SUPPORTED,
4367 _("g_socket_get_credentials not implemented for this OS"));
4374 * g_socket_get_option:
4375 * @socket: a #GSocket
4376 * @level: the "API level" of the option (eg, <literal>SOL_SOCKET</literal>)
4377 * @optname: the "name" of the option (eg, <literal>SO_BROADCAST</literal>)
4378 * @value: (out): return location for the option value
4379 * @error: #GError for error reporting, or %NULL to ignore.
4381 * Gets the value of an integer-valued option on @socket, as with
4382 * <literal>getsockopt ()</literal>. (If you need to fetch a
4383 * non-integer-valued option, you will need to call
4384 * <literal>getsockopt ()</literal> directly.)
4386 * The <link linkend="gio-gnetworking.h"><literal><gio/gnetworking.h></literal></link>
4387 * header pulls in system headers that will define most of the
4388 * standard/portable socket options. For unusual socket protocols or
4389 * platform-dependent options, you may need to include additional
4392 * Note that even for socket options that are a single byte in size,
4393 * @value is still a pointer to a #gint variable, not a #guchar;
4394 * g_socket_get_option() will handle the conversion internally.
4396 * Returns: success or failure. On failure, @error will be set, and
4397 * the system error value (<literal>errno</literal> or
4398 * <literal>WSAGetLastError ()</literal>) will still be set to the
4399 * result of the <literal>getsockopt ()</literal> call.
4404 g_socket_get_option (GSocket *socket,
4412 g_return_val_if_fail (G_IS_SOCKET (socket), FALSE);
4415 size = sizeof (gint);
4416 if (getsockopt (socket->priv->fd, level, optname, value, &size) != 0)
4418 int errsv = get_socket_errno ();
4420 g_set_error_literal (error,
4422 socket_io_error_from_errno (errsv),
4423 socket_strerror (errsv));
4425 /* Reset errno in case the caller wants to look at it */
4431 #if G_BYTE_ORDER == G_BIG_ENDIAN
4432 /* If the returned value is smaller than an int then we need to
4433 * slide it over into the low-order bytes of *value.
4435 if (size != sizeof (gint))
4436 *value = *value >> (8 * (sizeof (gint) - size));
4443 * g_socket_set_option:
4444 * @socket: a #GSocket
4445 * @level: the "API level" of the option (eg, <literal>SOL_SOCKET</literal>)
4446 * @optname: the "name" of the option (eg, <literal>SO_BROADCAST</literal>)
4447 * @value: the value to set the option to
4448 * @error: #GError for error reporting, or %NULL to ignore.
4450 * Sets the value of an integer-valued option on @socket, as with
4451 * <literal>setsockopt ()</literal>. (If you need to set a
4452 * non-integer-valued option, you will need to call
4453 * <literal>setsockopt ()</literal> directly.)
4455 * The <link linkend="gio-gnetworking.h"><literal><gio/gnetworking.h></literal></link>
4456 * header pulls in system headers that will define most of the
4457 * standard/portable socket options. For unusual socket protocols or
4458 * platform-dependent options, you may need to include additional
4461 * Returns: success or failure. On failure, @error will be set, and
4462 * the system error value (<literal>errno</literal> or
4463 * <literal>WSAGetLastError ()</literal>) will still be set to the
4464 * result of the <literal>setsockopt ()</literal> call.
4469 g_socket_set_option (GSocket *socket,
4477 g_return_val_if_fail (G_IS_SOCKET (socket), FALSE);
4479 if (setsockopt (socket->priv->fd, level, optname, &value, sizeof (gint)) == 0)
4482 #if !defined (__linux__) && !defined (G_OS_WIN32)
4483 /* Linux and Windows let you set a single-byte value from an int,
4484 * but most other platforms don't.
4486 if (errno == EINVAL && value >= SCHAR_MIN && value <= CHAR_MAX)
4488 #if G_BYTE_ORDER == G_BIG_ENDIAN
4489 value = value << (8 * (sizeof (gint) - 1));
4491 if (setsockopt (socket->priv->fd, level, optname, &value, 1) == 0)
4496 errsv = get_socket_errno ();
4498 g_set_error_literal (error,
4500 socket_io_error_from_errno (errsv),
4501 socket_strerror (errsv));