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 "gnetworkingprivate.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));
485 /* Wrapper around socket() that is shared with gnetworkmonitornetlink.c */
487 g_socket (gint domain,
495 fd = socket (domain, type | SOCK_CLOEXEC, protocol);
499 /* It's possible that libc has SOCK_CLOEXEC but the kernel does not */
500 if (fd < 0 && errno == EINVAL)
502 fd = socket (domain, type, protocol);
506 int errsv = get_socket_errno ();
508 g_set_error (error, G_IO_ERROR, socket_io_error_from_errno (errsv),
509 _("Unable to create socket: %s"), socket_strerror (errsv));
518 /* We always want to set close-on-exec to protect users. If you
519 need to so some weird inheritance to exec you can re-enable this
520 using lower level hacks with g_socket_get_fd(). */
521 flags = fcntl (fd, F_GETFD, 0);
523 (flags & FD_CLOEXEC) == 0)
526 fcntl (fd, F_SETFD, flags);
535 g_socket_create_socket (GSocketFamily family,
544 case G_SOCKET_TYPE_STREAM:
545 native_type = SOCK_STREAM;
548 case G_SOCKET_TYPE_DATAGRAM:
549 native_type = SOCK_DGRAM;
552 case G_SOCKET_TYPE_SEQPACKET:
553 native_type = SOCK_SEQPACKET;
557 g_assert_not_reached ();
562 g_set_error (error, G_IO_ERROR, G_IO_ERROR_INVALID_ARGUMENT,
563 _("Unable to create socket: %s"), _("Unknown family was specified"));
569 g_set_error (error, G_IO_ERROR, G_IO_ERROR_INVALID_ARGUMENT,
570 _("Unable to create socket: %s"), _("Unknown protocol was specified"));
574 return g_socket (family, native_type, protocol, error);
578 g_socket_constructed (GObject *object)
580 GSocket *socket = G_SOCKET (object);
582 if (socket->priv->fd >= 0)
583 /* create socket->priv info from the fd */
584 g_socket_details_from_fd (socket);
587 /* create the fd from socket->priv info */
588 socket->priv->fd = g_socket_create_socket (socket->priv->family,
590 socket->priv->protocol,
591 &socket->priv->construct_error);
593 /* Always use native nonblocking sockets, as
594 windows sets sockets to nonblocking automatically
595 in certain operations. This way we make things work
596 the same on all platforms */
597 if (socket->priv->fd != -1)
598 set_fd_nonblocking (socket->priv->fd);
602 g_socket_get_property (GObject *object,
607 GSocket *socket = G_SOCKET (object);
608 GSocketAddress *address;
613 g_value_set_enum (value, socket->priv->family);
617 g_value_set_enum (value, socket->priv->type);
621 g_value_set_enum (value, socket->priv->protocol);
625 g_value_set_int (value, socket->priv->fd);
629 g_value_set_boolean (value, socket->priv->blocking);
632 case PROP_LISTEN_BACKLOG:
633 g_value_set_int (value, socket->priv->listen_backlog);
637 g_value_set_boolean (value, socket->priv->keepalive);
640 case PROP_LOCAL_ADDRESS:
641 address = g_socket_get_local_address (socket, NULL);
642 g_value_take_object (value, address);
645 case PROP_REMOTE_ADDRESS:
646 address = g_socket_get_remote_address (socket, NULL);
647 g_value_take_object (value, address);
651 g_value_set_uint (value, socket->priv->timeout);
655 g_value_set_uint (value, g_socket_get_ttl (socket));
659 g_value_set_boolean (value, g_socket_get_broadcast (socket));
662 case PROP_MULTICAST_LOOPBACK:
663 g_value_set_boolean (value, g_socket_get_multicast_loopback (socket));
666 case PROP_MULTICAST_TTL:
667 g_value_set_uint (value, g_socket_get_multicast_ttl (socket));
671 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
676 g_socket_set_property (GObject *object,
681 GSocket *socket = G_SOCKET (object);
686 socket->priv->family = g_value_get_enum (value);
690 socket->priv->type = g_value_get_enum (value);
694 socket->priv->protocol = g_value_get_enum (value);
698 socket->priv->fd = g_value_get_int (value);
702 g_socket_set_blocking (socket, g_value_get_boolean (value));
705 case PROP_LISTEN_BACKLOG:
706 g_socket_set_listen_backlog (socket, g_value_get_int (value));
710 g_socket_set_keepalive (socket, g_value_get_boolean (value));
714 g_socket_set_timeout (socket, g_value_get_uint (value));
718 g_socket_set_ttl (socket, g_value_get_uint (value));
722 g_socket_set_broadcast (socket, g_value_get_boolean (value));
725 case PROP_MULTICAST_LOOPBACK:
726 g_socket_set_multicast_loopback (socket, g_value_get_boolean (value));
729 case PROP_MULTICAST_TTL:
730 g_socket_set_multicast_ttl (socket, g_value_get_uint (value));
734 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
739 g_socket_finalize (GObject *object)
741 GSocket *socket = G_SOCKET (object);
744 g_clear_error (&socket->priv->construct_error);
746 if (socket->priv->fd != -1 &&
747 !socket->priv->closed)
748 g_socket_close (socket, NULL);
750 if (socket->priv->remote_address)
751 g_object_unref (socket->priv->remote_address);
754 if (socket->priv->event != WSA_INVALID_EVENT)
756 WSACloseEvent (socket->priv->event);
757 socket->priv->event = WSA_INVALID_EVENT;
760 g_assert (socket->priv->requested_conditions == NULL);
763 for (i = 0; i < RECV_ADDR_CACHE_SIZE; i++)
765 if (socket->priv->recv_addr_cache[i].addr)
767 g_object_unref (socket->priv->recv_addr_cache[i].addr);
768 g_free (socket->priv->recv_addr_cache[i].native);
772 if (G_OBJECT_CLASS (g_socket_parent_class)->finalize)
773 (*G_OBJECT_CLASS (g_socket_parent_class)->finalize) (object);
777 g_socket_class_init (GSocketClass *klass)
779 GObjectClass *gobject_class G_GNUC_UNUSED = G_OBJECT_CLASS (klass);
782 /* There is no portable, thread-safe way to avoid having the process
783 * be killed by SIGPIPE when calling send() or sendmsg(), so we are
784 * forced to simply ignore the signal process-wide.
786 signal (SIGPIPE, SIG_IGN);
789 g_type_class_add_private (klass, sizeof (GSocketPrivate));
791 gobject_class->finalize = g_socket_finalize;
792 gobject_class->constructed = g_socket_constructed;
793 gobject_class->set_property = g_socket_set_property;
794 gobject_class->get_property = g_socket_get_property;
796 g_object_class_install_property (gobject_class, PROP_FAMILY,
797 g_param_spec_enum ("family",
799 P_("The sockets address family"),
800 G_TYPE_SOCKET_FAMILY,
801 G_SOCKET_FAMILY_INVALID,
802 G_PARAM_CONSTRUCT_ONLY |
804 G_PARAM_STATIC_STRINGS));
806 g_object_class_install_property (gobject_class, PROP_TYPE,
807 g_param_spec_enum ("type",
809 P_("The sockets type"),
811 G_SOCKET_TYPE_STREAM,
812 G_PARAM_CONSTRUCT_ONLY |
814 G_PARAM_STATIC_STRINGS));
816 g_object_class_install_property (gobject_class, PROP_PROTOCOL,
817 g_param_spec_enum ("protocol",
818 P_("Socket protocol"),
819 P_("The id of the protocol to use, or -1 for unknown"),
820 G_TYPE_SOCKET_PROTOCOL,
821 G_SOCKET_PROTOCOL_UNKNOWN,
822 G_PARAM_CONSTRUCT_ONLY |
824 G_PARAM_STATIC_STRINGS));
826 g_object_class_install_property (gobject_class, PROP_FD,
827 g_param_spec_int ("fd",
828 P_("File descriptor"),
829 P_("The sockets file descriptor"),
833 G_PARAM_CONSTRUCT_ONLY |
835 G_PARAM_STATIC_STRINGS));
837 g_object_class_install_property (gobject_class, PROP_BLOCKING,
838 g_param_spec_boolean ("blocking",
840 P_("Whether or not I/O on this socket is blocking"),
843 G_PARAM_STATIC_STRINGS));
845 g_object_class_install_property (gobject_class, PROP_LISTEN_BACKLOG,
846 g_param_spec_int ("listen-backlog",
847 P_("Listen backlog"),
848 P_("Outstanding connections in the listen queue"),
853 G_PARAM_STATIC_STRINGS));
855 g_object_class_install_property (gobject_class, PROP_KEEPALIVE,
856 g_param_spec_boolean ("keepalive",
857 P_("Keep connection alive"),
858 P_("Keep connection alive by sending periodic pings"),
861 G_PARAM_STATIC_STRINGS));
863 g_object_class_install_property (gobject_class, PROP_LOCAL_ADDRESS,
864 g_param_spec_object ("local-address",
866 P_("The local address the socket is bound to"),
867 G_TYPE_SOCKET_ADDRESS,
869 G_PARAM_STATIC_STRINGS));
871 g_object_class_install_property (gobject_class, PROP_REMOTE_ADDRESS,
872 g_param_spec_object ("remote-address",
873 P_("Remote address"),
874 P_("The remote address the socket is connected to"),
875 G_TYPE_SOCKET_ADDRESS,
877 G_PARAM_STATIC_STRINGS));
882 * The timeout in seconds on socket I/O
886 g_object_class_install_property (gobject_class, PROP_TIMEOUT,
887 g_param_spec_uint ("timeout",
889 P_("The timeout in seconds on socket I/O"),
894 G_PARAM_STATIC_STRINGS));
899 * Whether the socket should allow sending to and receiving from broadcast addresses.
903 g_object_class_install_property (gobject_class, PROP_BROADCAST,
904 g_param_spec_boolean ("broadcast",
906 P_("Whether to allow sending to and receiving from broadcast addresses"),
909 G_PARAM_STATIC_STRINGS));
914 * Time-to-live for outgoing unicast packets
918 g_object_class_install_property (gobject_class, PROP_TTL,
919 g_param_spec_uint ("ttl",
921 P_("Time-to-live of outgoing unicast packets"),
924 G_PARAM_STATIC_STRINGS));
927 * GSocket:multicast-loopback:
929 * Whether outgoing multicast packets loop back to the local host.
933 g_object_class_install_property (gobject_class, PROP_MULTICAST_LOOPBACK,
934 g_param_spec_boolean ("multicast-loopback",
935 P_("Multicast loopback"),
936 P_("Whether outgoing multicast packets loop back to the local host"),
939 G_PARAM_STATIC_STRINGS));
942 * GSocket:multicast-ttl:
944 * Time-to-live out outgoing multicast packets
948 g_object_class_install_property (gobject_class, PROP_MULTICAST_TTL,
949 g_param_spec_uint ("multicast-ttl",
951 P_("Time-to-live of outgoing multicast packets"),
954 G_PARAM_STATIC_STRINGS));
958 g_socket_initable_iface_init (GInitableIface *iface)
960 iface->init = g_socket_initable_init;
964 g_socket_init (GSocket *socket)
966 socket->priv = G_TYPE_INSTANCE_GET_PRIVATE (socket, G_TYPE_SOCKET, GSocketPrivate);
968 socket->priv->fd = -1;
969 socket->priv->blocking = TRUE;
970 socket->priv->listen_backlog = 10;
971 socket->priv->construct_error = NULL;
973 socket->priv->event = WSA_INVALID_EVENT;
978 g_socket_initable_init (GInitable *initable,
979 GCancellable *cancellable,
984 g_return_val_if_fail (G_IS_SOCKET (initable), FALSE);
986 socket = G_SOCKET (initable);
988 if (cancellable != NULL)
990 g_set_error_literal (error, G_IO_ERROR, G_IO_ERROR_NOT_SUPPORTED,
991 _("Cancellable initialization not supported"));
995 socket->priv->inited = TRUE;
997 if (socket->priv->construct_error)
1000 *error = g_error_copy (socket->priv->construct_error);
1010 * @family: the socket family to use, e.g. %G_SOCKET_FAMILY_IPV4.
1011 * @type: the socket type to use.
1012 * @protocol: the id of the protocol to use, or 0 for default.
1013 * @error: #GError for error reporting, or %NULL to ignore.
1015 * Creates a new #GSocket with the defined family, type and protocol.
1016 * If @protocol is 0 (%G_SOCKET_PROTOCOL_DEFAULT) the default protocol type
1017 * for the family and type is used.
1019 * The @protocol is a family and type specific int that specifies what
1020 * kind of protocol to use. #GSocketProtocol lists several common ones.
1021 * Many families only support one protocol, and use 0 for this, others
1022 * support several and using 0 means to use the default protocol for
1023 * the family and type.
1025 * The protocol id is passed directly to the operating
1026 * system, so you can use protocols not listed in #GSocketProtocol if you
1027 * know the protocol number used for it.
1029 * Returns: a #GSocket or %NULL on error.
1030 * Free the returned object with g_object_unref().
1035 g_socket_new (GSocketFamily family,
1037 GSocketProtocol protocol,
1040 return G_SOCKET (g_initable_new (G_TYPE_SOCKET,
1044 "protocol", protocol,
1049 * g_socket_new_from_fd:
1050 * @fd: a native socket file descriptor.
1051 * @error: #GError for error reporting, or %NULL to ignore.
1053 * Creates a new #GSocket from a native file descriptor
1054 * or winsock SOCKET handle.
1056 * This reads all the settings from the file descriptor so that
1057 * all properties should work. Note that the file descriptor
1058 * will be set to non-blocking mode, independent on the blocking
1059 * mode of the #GSocket.
1061 * Returns: a #GSocket or %NULL on error.
1062 * Free the returned object with g_object_unref().
1067 g_socket_new_from_fd (gint fd,
1070 return G_SOCKET (g_initable_new (G_TYPE_SOCKET,
1077 * g_socket_set_blocking:
1078 * @socket: a #GSocket.
1079 * @blocking: Whether to use blocking I/O or not.
1081 * Sets the blocking mode of the socket. In blocking mode
1082 * all operations block until they succeed or there is an error. In
1083 * non-blocking mode all functions return results immediately or
1084 * with a %G_IO_ERROR_WOULD_BLOCK error.
1086 * All sockets are created in blocking mode. However, note that the
1087 * platform level socket is always non-blocking, and blocking mode
1088 * is a GSocket level feature.
1093 g_socket_set_blocking (GSocket *socket,
1096 g_return_if_fail (G_IS_SOCKET (socket));
1098 blocking = !!blocking;
1100 if (socket->priv->blocking == blocking)
1103 socket->priv->blocking = blocking;
1104 g_object_notify (G_OBJECT (socket), "blocking");
1108 * g_socket_get_blocking:
1109 * @socket: a #GSocket.
1111 * Gets the blocking mode of the socket. For details on blocking I/O,
1112 * see g_socket_set_blocking().
1114 * Returns: %TRUE if blocking I/O is used, %FALSE otherwise.
1119 g_socket_get_blocking (GSocket *socket)
1121 g_return_val_if_fail (G_IS_SOCKET (socket), FALSE);
1123 return socket->priv->blocking;
1127 * g_socket_set_keepalive:
1128 * @socket: a #GSocket.
1129 * @keepalive: Value for the keepalive flag
1131 * Sets or unsets the %SO_KEEPALIVE flag on the underlying socket. When
1132 * this flag is set on a socket, the system will attempt to verify that the
1133 * remote socket endpoint is still present if a sufficiently long period of
1134 * time passes with no data being exchanged. If the system is unable to
1135 * verify the presence of the remote endpoint, it will automatically close
1138 * This option is only functional on certain kinds of sockets. (Notably,
1139 * %G_SOCKET_PROTOCOL_TCP sockets.)
1141 * The exact time between pings is system- and protocol-dependent, but will
1142 * normally be at least two hours. Most commonly, you would set this flag
1143 * on a server socket if you want to allow clients to remain idle for long
1144 * periods of time, but also want to ensure that connections are eventually
1145 * garbage-collected if clients crash or become unreachable.
1150 g_socket_set_keepalive (GSocket *socket,
1153 GError *error = NULL;
1155 g_return_if_fail (G_IS_SOCKET (socket));
1157 keepalive = !!keepalive;
1158 if (socket->priv->keepalive == keepalive)
1161 if (!g_socket_set_option (socket, SOL_SOCKET, SO_KEEPALIVE,
1164 g_warning ("error setting keepalive: %s", error->message);
1165 g_error_free (error);
1169 socket->priv->keepalive = keepalive;
1170 g_object_notify (G_OBJECT (socket), "keepalive");
1174 * g_socket_get_keepalive:
1175 * @socket: a #GSocket.
1177 * Gets the keepalive mode of the socket. For details on this,
1178 * see g_socket_set_keepalive().
1180 * Returns: %TRUE if keepalive is active, %FALSE otherwise.
1185 g_socket_get_keepalive (GSocket *socket)
1187 g_return_val_if_fail (G_IS_SOCKET (socket), FALSE);
1189 return socket->priv->keepalive;
1193 * g_socket_get_listen_backlog:
1194 * @socket: a #GSocket.
1196 * Gets the listen backlog setting of the socket. For details on this,
1197 * see g_socket_set_listen_backlog().
1199 * Returns: the maximum number of pending connections.
1204 g_socket_get_listen_backlog (GSocket *socket)
1206 g_return_val_if_fail (G_IS_SOCKET (socket), 0);
1208 return socket->priv->listen_backlog;
1212 * g_socket_set_listen_backlog:
1213 * @socket: a #GSocket.
1214 * @backlog: the maximum number of pending connections.
1216 * Sets the maximum number of outstanding connections allowed
1217 * when listening on this socket. If more clients than this are
1218 * connecting to the socket and the application is not handling them
1219 * on time then the new connections will be refused.
1221 * Note that this must be called before g_socket_listen() and has no
1222 * effect if called after that.
1227 g_socket_set_listen_backlog (GSocket *socket,
1230 g_return_if_fail (G_IS_SOCKET (socket));
1231 g_return_if_fail (!socket->priv->listening);
1233 if (backlog != socket->priv->listen_backlog)
1235 socket->priv->listen_backlog = backlog;
1236 g_object_notify (G_OBJECT (socket), "listen-backlog");
1241 * g_socket_get_timeout:
1242 * @socket: a #GSocket.
1244 * Gets the timeout setting of the socket. For details on this, see
1245 * g_socket_set_timeout().
1247 * Returns: the timeout in seconds
1252 g_socket_get_timeout (GSocket *socket)
1254 g_return_val_if_fail (G_IS_SOCKET (socket), 0);
1256 return socket->priv->timeout;
1260 * g_socket_set_timeout:
1261 * @socket: a #GSocket.
1262 * @timeout: the timeout for @socket, in seconds, or 0 for none
1264 * Sets the time in seconds after which I/O operations on @socket will
1265 * time out if they have not yet completed.
1267 * On a blocking socket, this means that any blocking #GSocket
1268 * operation will time out after @timeout seconds of inactivity,
1269 * returning %G_IO_ERROR_TIMED_OUT.
1271 * On a non-blocking socket, calls to g_socket_condition_wait() will
1272 * also fail with %G_IO_ERROR_TIMED_OUT after the given time. Sources
1273 * created with g_socket_create_source() will trigger after
1274 * @timeout seconds of inactivity, with the requested condition
1275 * set, at which point calling g_socket_receive(), g_socket_send(),
1276 * g_socket_check_connect_result(), etc, will fail with
1277 * %G_IO_ERROR_TIMED_OUT.
1279 * If @timeout is 0 (the default), operations will never time out
1282 * Note that if an I/O operation is interrupted by a signal, this may
1283 * cause the timeout to be reset.
1288 g_socket_set_timeout (GSocket *socket,
1291 g_return_if_fail (G_IS_SOCKET (socket));
1293 if (timeout != socket->priv->timeout)
1295 socket->priv->timeout = timeout;
1296 g_object_notify (G_OBJECT (socket), "timeout");
1302 * @socket: a #GSocket.
1304 * Gets the unicast time-to-live setting on @socket; see
1305 * g_socket_set_ttl() for more details.
1307 * Returns: the time-to-live setting on @socket
1312 g_socket_get_ttl (GSocket *socket)
1314 GError *error = NULL;
1317 g_return_val_if_fail (G_IS_SOCKET (socket), 0);
1319 if (socket->priv->family == G_SOCKET_FAMILY_IPV4)
1321 g_socket_get_option (socket, IPPROTO_IP, IP_TTL,
1324 else if (socket->priv->family == G_SOCKET_FAMILY_IPV6)
1326 g_socket_get_option (socket, IPPROTO_IPV6, IPV6_UNICAST_HOPS,
1330 g_return_val_if_reached (0);
1334 g_warning ("error getting unicast ttl: %s", error->message);
1335 g_error_free (error);
1344 * @socket: a #GSocket.
1345 * @ttl: the time-to-live value for all unicast packets on @socket
1347 * Sets the time-to-live for outgoing unicast packets on @socket.
1348 * By default the platform-specific default value is used.
1353 g_socket_set_ttl (GSocket *socket,
1356 GError *error = NULL;
1358 g_return_if_fail (G_IS_SOCKET (socket));
1360 if (socket->priv->family == G_SOCKET_FAMILY_IPV4)
1362 g_socket_set_option (socket, IPPROTO_IP, IP_TTL,
1365 else if (socket->priv->family == G_SOCKET_FAMILY_IPV6)
1367 g_socket_set_option (socket, IPPROTO_IP, IP_TTL,
1369 g_socket_set_option (socket, IPPROTO_IPV6, IPV6_UNICAST_HOPS,
1373 g_return_if_reached ();
1377 g_warning ("error setting unicast ttl: %s", error->message);
1378 g_error_free (error);
1382 g_object_notify (G_OBJECT (socket), "ttl");
1386 * g_socket_get_broadcast:
1387 * @socket: a #GSocket.
1389 * Gets the broadcast setting on @socket; if %TRUE,
1390 * it is possible to send packets to broadcast
1391 * addresses or receive from broadcast addresses.
1393 * Returns: the broadcast setting on @socket
1398 g_socket_get_broadcast (GSocket *socket)
1400 GError *error = NULL;
1403 g_return_val_if_fail (G_IS_SOCKET (socket), FALSE);
1405 if (!g_socket_get_option (socket, SOL_SOCKET, SO_BROADCAST,
1408 g_warning ("error getting broadcast: %s", error->message);
1409 g_error_free (error);
1417 * g_socket_set_broadcast:
1418 * @socket: a #GSocket.
1419 * @broadcast: whether @socket should allow sending to and receiving
1420 * from broadcast addresses
1422 * Sets whether @socket should allow sending to and receiving from
1423 * broadcast addresses. This is %FALSE by default.
1428 g_socket_set_broadcast (GSocket *socket,
1431 GError *error = NULL;
1433 g_return_if_fail (G_IS_SOCKET (socket));
1435 broadcast = !!broadcast;
1437 if (!g_socket_set_option (socket, SOL_SOCKET, SO_BROADCAST,
1440 g_warning ("error setting broadcast: %s", error->message);
1441 g_error_free (error);
1445 g_object_notify (G_OBJECT (socket), "broadcast");
1449 * g_socket_get_multicast_loopback:
1450 * @socket: a #GSocket.
1452 * Gets the multicast loopback setting on @socket; if %TRUE (the
1453 * default), outgoing multicast packets will be looped back to
1454 * multicast listeners on the same host.
1456 * Returns: the multicast loopback setting on @socket
1461 g_socket_get_multicast_loopback (GSocket *socket)
1463 GError *error = NULL;
1466 g_return_val_if_fail (G_IS_SOCKET (socket), FALSE);
1468 if (socket->priv->family == G_SOCKET_FAMILY_IPV4)
1470 g_socket_get_option (socket, IPPROTO_IP, IP_MULTICAST_LOOP,
1473 else if (socket->priv->family == G_SOCKET_FAMILY_IPV6)
1475 g_socket_get_option (socket, IPPROTO_IPV6, IPV6_MULTICAST_LOOP,
1479 g_return_val_if_reached (FALSE);
1483 g_warning ("error getting multicast loopback: %s", error->message);
1484 g_error_free (error);
1492 * g_socket_set_multicast_loopback:
1493 * @socket: a #GSocket.
1494 * @loopback: whether @socket should receive messages sent to its
1495 * multicast groups from the local host
1497 * Sets whether outgoing multicast packets will be received by sockets
1498 * listening on that multicast address on the same host. This is %TRUE
1504 g_socket_set_multicast_loopback (GSocket *socket,
1507 GError *error = NULL;
1509 g_return_if_fail (G_IS_SOCKET (socket));
1511 loopback = !!loopback;
1513 if (socket->priv->family == G_SOCKET_FAMILY_IPV4)
1515 g_socket_set_option (socket, IPPROTO_IP, IP_MULTICAST_LOOP,
1518 else if (socket->priv->family == G_SOCKET_FAMILY_IPV6)
1520 g_socket_set_option (socket, IPPROTO_IP, IP_MULTICAST_LOOP,
1522 g_socket_set_option (socket, IPPROTO_IPV6, IPV6_MULTICAST_LOOP,
1526 g_return_if_reached ();
1530 g_warning ("error setting multicast loopback: %s", error->message);
1531 g_error_free (error);
1535 g_object_notify (G_OBJECT (socket), "multicast-loopback");
1539 * g_socket_get_multicast_ttl:
1540 * @socket: a #GSocket.
1542 * Gets the multicast time-to-live setting on @socket; see
1543 * g_socket_set_multicast_ttl() for more details.
1545 * Returns: the multicast time-to-live setting on @socket
1550 g_socket_get_multicast_ttl (GSocket *socket)
1552 GError *error = NULL;
1555 g_return_val_if_fail (G_IS_SOCKET (socket), 0);
1557 if (socket->priv->family == G_SOCKET_FAMILY_IPV4)
1559 g_socket_get_option (socket, IPPROTO_IP, IP_MULTICAST_TTL,
1562 else if (socket->priv->family == G_SOCKET_FAMILY_IPV6)
1564 g_socket_get_option (socket, IPPROTO_IPV6, IPV6_MULTICAST_HOPS,
1568 g_return_val_if_reached (FALSE);
1572 g_warning ("error getting multicast ttl: %s", error->message);
1573 g_error_free (error);
1581 * g_socket_set_multicast_ttl:
1582 * @socket: a #GSocket.
1583 * @ttl: the time-to-live value for all multicast datagrams on @socket
1585 * Sets the time-to-live for outgoing multicast datagrams on @socket.
1586 * By default, this is 1, meaning that multicast packets will not leave
1587 * the local network.
1592 g_socket_set_multicast_ttl (GSocket *socket,
1595 GError *error = NULL;
1597 g_return_if_fail (G_IS_SOCKET (socket));
1599 if (socket->priv->family == G_SOCKET_FAMILY_IPV4)
1601 g_socket_set_option (socket, IPPROTO_IP, IP_MULTICAST_TTL,
1604 else if (socket->priv->family == G_SOCKET_FAMILY_IPV6)
1606 g_socket_set_option (socket, IPPROTO_IP, IP_MULTICAST_TTL,
1608 g_socket_set_option (socket, IPPROTO_IPV6, IPV6_MULTICAST_HOPS,
1612 g_return_if_reached ();
1616 g_warning ("error setting multicast ttl: %s", error->message);
1617 g_error_free (error);
1621 g_object_notify (G_OBJECT (socket), "multicast-ttl");
1625 * g_socket_get_family:
1626 * @socket: a #GSocket.
1628 * Gets the socket family of the socket.
1630 * Returns: a #GSocketFamily
1635 g_socket_get_family (GSocket *socket)
1637 g_return_val_if_fail (G_IS_SOCKET (socket), G_SOCKET_FAMILY_INVALID);
1639 return socket->priv->family;
1643 * g_socket_get_socket_type:
1644 * @socket: a #GSocket.
1646 * Gets the socket type of the socket.
1648 * Returns: a #GSocketType
1653 g_socket_get_socket_type (GSocket *socket)
1655 g_return_val_if_fail (G_IS_SOCKET (socket), G_SOCKET_TYPE_INVALID);
1657 return socket->priv->type;
1661 * g_socket_get_protocol:
1662 * @socket: a #GSocket.
1664 * Gets the socket protocol id the socket was created with.
1665 * In case the protocol is unknown, -1 is returned.
1667 * Returns: a protocol id, or -1 if unknown
1672 g_socket_get_protocol (GSocket *socket)
1674 g_return_val_if_fail (G_IS_SOCKET (socket), -1);
1676 return socket->priv->protocol;
1681 * @socket: a #GSocket.
1683 * Returns the underlying OS socket object. On unix this
1684 * is a socket file descriptor, and on Windows this is
1685 * a Winsock2 SOCKET handle. This may be useful for
1686 * doing platform specific or otherwise unusual operations
1689 * Returns: the file descriptor of the socket.
1694 g_socket_get_fd (GSocket *socket)
1696 g_return_val_if_fail (G_IS_SOCKET (socket), -1);
1698 return socket->priv->fd;
1702 * g_socket_get_local_address:
1703 * @socket: a #GSocket.
1704 * @error: #GError for error reporting, or %NULL to ignore.
1706 * Try to get the local address of a bound socket. This is only
1707 * useful if the socket has been bound to a local address,
1708 * either explicitly or implicitly when connecting.
1710 * Returns: (transfer full): a #GSocketAddress or %NULL on error.
1711 * Free the returned object with g_object_unref().
1716 g_socket_get_local_address (GSocket *socket,
1719 struct sockaddr_storage buffer;
1720 guint len = sizeof (buffer);
1722 g_return_val_if_fail (G_IS_SOCKET (socket), NULL);
1724 if (getsockname (socket->priv->fd, (struct sockaddr *) &buffer, &len) < 0)
1726 int errsv = get_socket_errno ();
1727 g_set_error (error, G_IO_ERROR, socket_io_error_from_errno (errsv),
1728 _("could not get local address: %s"), socket_strerror (errsv));
1732 return g_socket_address_new_from_native (&buffer, len);
1736 * g_socket_get_remote_address:
1737 * @socket: a #GSocket.
1738 * @error: #GError for error reporting, or %NULL to ignore.
1740 * Try to get the remove address of a connected socket. This is only
1741 * useful for connection oriented sockets that have been connected.
1743 * Returns: (transfer full): a #GSocketAddress or %NULL on error.
1744 * Free the returned object with g_object_unref().
1749 g_socket_get_remote_address (GSocket *socket,
1752 struct sockaddr_storage buffer;
1753 guint len = sizeof (buffer);
1755 g_return_val_if_fail (G_IS_SOCKET (socket), NULL);
1757 if (socket->priv->connect_pending)
1759 if (!g_socket_check_connect_result (socket, error))
1762 socket->priv->connect_pending = FALSE;
1765 if (!socket->priv->remote_address)
1767 if (getpeername (socket->priv->fd, (struct sockaddr *) &buffer, &len) < 0)
1769 int errsv = get_socket_errno ();
1770 g_set_error (error, G_IO_ERROR, socket_io_error_from_errno (errsv),
1771 _("could not get remote address: %s"), socket_strerror (errsv));
1775 socket->priv->remote_address = g_socket_address_new_from_native (&buffer, len);
1778 return g_object_ref (socket->priv->remote_address);
1782 * g_socket_is_connected:
1783 * @socket: a #GSocket.
1785 * Check whether the socket is connected. This is only useful for
1786 * connection-oriented sockets.
1788 * Returns: %TRUE if socket is connected, %FALSE otherwise.
1793 g_socket_is_connected (GSocket *socket)
1795 g_return_val_if_fail (G_IS_SOCKET (socket), FALSE);
1797 return socket->priv->connected;
1802 * @socket: a #GSocket.
1803 * @error: #GError for error reporting, or %NULL to ignore.
1805 * Marks the socket as a server socket, i.e. a socket that is used
1806 * to accept incoming requests using g_socket_accept().
1808 * Before calling this the socket must be bound to a local address using
1811 * To set the maximum amount of outstanding clients, use
1812 * g_socket_set_listen_backlog().
1814 * Returns: %TRUE on success, %FALSE on error.
1819 g_socket_listen (GSocket *socket,
1822 g_return_val_if_fail (G_IS_SOCKET (socket), FALSE);
1824 if (!check_socket (socket, error))
1827 if (listen (socket->priv->fd, socket->priv->listen_backlog) < 0)
1829 int errsv = get_socket_errno ();
1831 g_set_error (error, G_IO_ERROR, socket_io_error_from_errno (errsv),
1832 _("could not listen: %s"), socket_strerror (errsv));
1836 socket->priv->listening = TRUE;
1843 * @socket: a #GSocket.
1844 * @address: a #GSocketAddress specifying the local address.
1845 * @allow_reuse: whether to allow reusing this address
1846 * @error: #GError for error reporting, or %NULL to ignore.
1848 * When a socket is created it is attached to an address family, but it
1849 * doesn't have an address in this family. g_socket_bind() assigns the
1850 * address (sometimes called name) of the socket.
1852 * It is generally required to bind to a local address before you can
1853 * receive connections. (See g_socket_listen() and g_socket_accept() ).
1854 * In certain situations, you may also want to bind a socket that will be
1855 * used to initiate connections, though this is not normally required.
1857 * @allow_reuse should be %TRUE for server sockets (sockets that you will
1858 * eventually call g_socket_accept() on), and %FALSE for client sockets.
1859 * (Specifically, if it is %TRUE, then g_socket_bind() will set the
1860 * %SO_REUSEADDR flag on the socket, allowing it to bind @address even if
1861 * that address was previously used by another socket that has not yet been
1862 * fully cleaned-up by the kernel. Failing to set this flag on a server
1863 * socket may cause the bind call to return %G_IO_ERROR_ADDRESS_IN_USE if
1864 * the server program is stopped and then immediately restarted.)
1866 * Returns: %TRUE on success, %FALSE on error.
1871 g_socket_bind (GSocket *socket,
1872 GSocketAddress *address,
1873 gboolean reuse_address,
1876 struct sockaddr_storage addr;
1878 g_return_val_if_fail (G_IS_SOCKET (socket) && G_IS_SOCKET_ADDRESS (address), FALSE);
1880 if (!check_socket (socket, error))
1883 /* SO_REUSEADDR on Windows means something else and is not what we want.
1884 It always allows the unix variant of SO_REUSEADDR anyway */
1887 reuse_address = !!reuse_address;
1888 /* Ignore errors here, the only likely error is "not supported", and
1889 this is a "best effort" thing mainly */
1890 g_socket_set_option (socket, SOL_SOCKET, SO_REUSEADDR,
1891 reuse_address, NULL);
1895 if (!g_socket_address_to_native (address, &addr, sizeof addr, error))
1898 if (bind (socket->priv->fd, (struct sockaddr *) &addr,
1899 g_socket_address_get_native_size (address)) < 0)
1901 int errsv = get_socket_errno ();
1903 G_IO_ERROR, socket_io_error_from_errno (errsv),
1904 _("Error binding to address: %s"), socket_strerror (errsv));
1912 g_socket_multicast_group_operation (GSocket *socket,
1913 GInetAddress *group,
1914 gboolean source_specific,
1916 gboolean join_group,
1919 const guint8 *native_addr;
1920 gint optname, result;
1922 g_return_val_if_fail (G_IS_SOCKET (socket), FALSE);
1923 g_return_val_if_fail (socket->priv->type == G_SOCKET_TYPE_DATAGRAM, FALSE);
1924 g_return_val_if_fail (G_IS_INET_ADDRESS (group), FALSE);
1926 if (!check_socket (socket, error))
1929 native_addr = g_inet_address_to_bytes (group);
1930 if (g_inet_address_get_family (group) == G_SOCKET_FAMILY_IPV4)
1932 #ifdef HAVE_IP_MREQN
1933 struct ip_mreqn mc_req;
1935 struct ip_mreq mc_req;
1938 memset (&mc_req, 0, sizeof (mc_req));
1939 memcpy (&mc_req.imr_multiaddr, native_addr, sizeof (struct in_addr));
1941 #ifdef HAVE_IP_MREQN
1943 mc_req.imr_ifindex = if_nametoindex (iface);
1945 mc_req.imr_ifindex = 0; /* Pick any. */
1947 mc_req.imr_interface.s_addr = g_htonl (INADDR_ANY);
1950 if (source_specific)
1952 #ifdef IP_ADD_SOURCE_MEMBERSHIP
1953 optname = join_group ? IP_ADD_SOURCE_MEMBERSHIP : IP_DROP_SOURCE_MEMBERSHIP;
1955 g_set_error (error, G_IO_ERROR, G_IO_ERROR_NOT_SUPPORTED,
1957 _("Error joining multicast group: %s") :
1958 _("Error leaving multicast group: %s"),
1959 _("No support for source-specific multicast"));
1964 optname = join_group ? IP_ADD_MEMBERSHIP : IP_DROP_MEMBERSHIP;
1965 result = setsockopt (socket->priv->fd, IPPROTO_IP, optname,
1966 &mc_req, sizeof (mc_req));
1968 else if (g_inet_address_get_family (group) == G_SOCKET_FAMILY_IPV6)
1970 struct ipv6_mreq mc_req_ipv6;
1972 memset (&mc_req_ipv6, 0, sizeof (mc_req_ipv6));
1973 memcpy (&mc_req_ipv6.ipv6mr_multiaddr, native_addr, sizeof (struct in6_addr));
1974 #ifdef HAVE_IF_NAMETOINDEX
1976 mc_req_ipv6.ipv6mr_interface = if_nametoindex (iface);
1979 mc_req_ipv6.ipv6mr_interface = 0;
1981 optname = join_group ? IPV6_JOIN_GROUP : IPV6_LEAVE_GROUP;
1982 result = setsockopt (socket->priv->fd, IPPROTO_IPV6, optname,
1983 &mc_req_ipv6, sizeof (mc_req_ipv6));
1986 g_return_val_if_reached (FALSE);
1990 int errsv = get_socket_errno ();
1992 g_set_error (error, G_IO_ERROR, socket_io_error_from_errno (errsv),
1994 _("Error joining multicast group: %s") :
1995 _("Error leaving multicast group: %s"),
1996 socket_strerror (errsv));
2004 * g_socket_join_multicast_group:
2005 * @socket: a #GSocket.
2006 * @group: a #GInetAddress specifying the group address to join.
2007 * @iface: (allow-none): Name of the interface to use, or %NULL
2008 * @source_specific: %TRUE if source-specific multicast should be used
2009 * @error: #GError for error reporting, or %NULL to ignore.
2011 * Registers @socket to receive multicast messages sent to @group.
2012 * @socket must be a %G_SOCKET_TYPE_DATAGRAM socket, and must have
2013 * been bound to an appropriate interface and port with
2016 * If @iface is %NULL, the system will automatically pick an interface
2017 * to bind to based on @group.
2019 * If @source_specific is %TRUE, source-specific multicast as defined
2020 * in RFC 4604 is used. Note that on older platforms this may fail
2021 * with a %G_IO_ERROR_NOT_SUPPORTED error.
2023 * Returns: %TRUE on success, %FALSE on error.
2028 g_socket_join_multicast_group (GSocket *socket,
2029 GInetAddress *group,
2030 gboolean source_specific,
2034 return g_socket_multicast_group_operation (socket, group, source_specific, iface, TRUE, error);
2038 * g_socket_leave_multicast_group:
2039 * @socket: a #GSocket.
2040 * @group: a #GInetAddress specifying the group address to leave.
2041 * @iface: (allow-none): Interface used
2042 * @source_specific: %TRUE if source-specific multicast was used
2043 * @error: #GError for error reporting, or %NULL to ignore.
2045 * Removes @socket from the multicast group defined by @group, @iface,
2046 * and @source_specific (which must all have the same values they had
2047 * when you joined the group).
2049 * @socket remains bound to its address and port, and can still receive
2050 * unicast messages after calling this.
2052 * Returns: %TRUE on success, %FALSE on error.
2057 g_socket_leave_multicast_group (GSocket *socket,
2058 GInetAddress *group,
2059 gboolean source_specific,
2063 return g_socket_multicast_group_operation (socket, group, source_specific, iface, FALSE, error);
2067 * g_socket_speaks_ipv4:
2068 * @socket: a #GSocket
2070 * Checks if a socket is capable of speaking IPv4.
2072 * IPv4 sockets are capable of speaking IPv4. On some operating systems
2073 * and under some combinations of circumstances IPv6 sockets are also
2074 * capable of speaking IPv4. See RFC 3493 section 3.7 for more
2077 * No other types of sockets are currently considered as being capable
2080 * Returns: %TRUE if this socket can be used with IPv4.
2085 g_socket_speaks_ipv4 (GSocket *socket)
2087 switch (socket->priv->family)
2089 case G_SOCKET_FAMILY_IPV4:
2092 case G_SOCKET_FAMILY_IPV6:
2093 #if defined (IPPROTO_IPV6) && defined (IPV6_V6ONLY)
2097 if (!g_socket_get_option (socket,
2098 IPPROTO_IPV6, IPV6_V6ONLY,
2115 * @socket: a #GSocket.
2116 * @cancellable: (allow-none): a %GCancellable or %NULL
2117 * @error: #GError for error reporting, or %NULL to ignore.
2119 * Accept incoming connections on a connection-based socket. This removes
2120 * the first outstanding connection request from the listening socket and
2121 * creates a #GSocket object for it.
2123 * The @socket must be bound to a local address with g_socket_bind() and
2124 * must be listening for incoming connections (g_socket_listen()).
2126 * If there are no outstanding connections then the operation will block
2127 * or return %G_IO_ERROR_WOULD_BLOCK if non-blocking I/O is enabled.
2128 * To be notified of an incoming connection, wait for the %G_IO_IN condition.
2130 * Returns: (transfer full): a new #GSocket, or %NULL on error.
2131 * Free the returned object with g_object_unref().
2136 g_socket_accept (GSocket *socket,
2137 GCancellable *cancellable,
2140 GSocket *new_socket;
2143 g_return_val_if_fail (G_IS_SOCKET (socket), NULL);
2145 if (!check_socket (socket, error))
2150 if (socket->priv->blocking &&
2151 !g_socket_condition_wait (socket,
2152 G_IO_IN, cancellable, error))
2155 if ((ret = accept (socket->priv->fd, NULL, 0)) < 0)
2157 int errsv = get_socket_errno ();
2159 win32_unset_event_mask (socket, FD_ACCEPT);
2164 if (socket->priv->blocking)
2166 #ifdef WSAEWOULDBLOCK
2167 if (errsv == WSAEWOULDBLOCK)
2170 if (errsv == EWOULDBLOCK ||
2176 g_set_error (error, G_IO_ERROR,
2177 socket_io_error_from_errno (errsv),
2178 _("Error accepting connection: %s"), socket_strerror (errsv));
2184 win32_unset_event_mask (socket, FD_ACCEPT);
2188 /* The socket inherits the accepting sockets event mask and even object,
2189 we need to remove that */
2190 WSAEventSelect (ret, NULL, 0);
2196 /* We always want to set close-on-exec to protect users. If you
2197 need to so some weird inheritance to exec you can re-enable this
2198 using lower level hacks with g_socket_get_fd(). */
2199 flags = fcntl (ret, F_GETFD, 0);
2201 (flags & FD_CLOEXEC) == 0)
2203 flags |= FD_CLOEXEC;
2204 fcntl (ret, F_SETFD, flags);
2209 new_socket = g_socket_new_from_fd (ret, error);
2210 if (new_socket == NULL)
2219 new_socket->priv->protocol = socket->priv->protocol;
2226 * @socket: a #GSocket.
2227 * @address: a #GSocketAddress specifying the remote address.
2228 * @cancellable: (allow-none): a %GCancellable or %NULL
2229 * @error: #GError for error reporting, or %NULL to ignore.
2231 * Connect the socket to the specified remote address.
2233 * For connection oriented socket this generally means we attempt to make
2234 * a connection to the @address. For a connection-less socket it sets
2235 * the default address for g_socket_send() and discards all incoming datagrams
2236 * from other sources.
2238 * Generally connection oriented sockets can only connect once, but
2239 * connection-less sockets can connect multiple times to change the
2242 * If the connect call needs to do network I/O it will block, unless
2243 * non-blocking I/O is enabled. Then %G_IO_ERROR_PENDING is returned
2244 * and the user can be notified of the connection finishing by waiting
2245 * for the G_IO_OUT condition. The result of the connection must then be
2246 * checked with g_socket_check_connect_result().
2248 * Returns: %TRUE if connected, %FALSE on error.
2253 g_socket_connect (GSocket *socket,
2254 GSocketAddress *address,
2255 GCancellable *cancellable,
2258 struct sockaddr_storage buffer;
2260 g_return_val_if_fail (G_IS_SOCKET (socket) && G_IS_SOCKET_ADDRESS (address), FALSE);
2262 if (!check_socket (socket, error))
2265 if (!g_socket_address_to_native (address, &buffer, sizeof buffer, error))
2268 if (socket->priv->remote_address)
2269 g_object_unref (socket->priv->remote_address);
2270 socket->priv->remote_address = g_object_ref (address);
2274 if (connect (socket->priv->fd, (struct sockaddr *) &buffer,
2275 g_socket_address_get_native_size (address)) < 0)
2277 int errsv = get_socket_errno ();
2283 if (errsv == EINPROGRESS)
2285 if (errsv == WSAEWOULDBLOCK)
2288 if (socket->priv->blocking)
2290 if (g_socket_condition_wait (socket, G_IO_OUT, cancellable, error))
2292 if (g_socket_check_connect_result (socket, error))
2298 g_set_error_literal (error, G_IO_ERROR, G_IO_ERROR_PENDING,
2299 _("Connection in progress"));
2300 socket->priv->connect_pending = TRUE;
2304 g_set_error_literal (error, G_IO_ERROR,
2305 socket_io_error_from_errno (errsv),
2306 socket_strerror (errsv));
2313 win32_unset_event_mask (socket, FD_CONNECT);
2315 socket->priv->connected = TRUE;
2321 * g_socket_check_connect_result:
2322 * @socket: a #GSocket
2323 * @error: #GError for error reporting, or %NULL to ignore.
2325 * Checks and resets the pending connect error for the socket.
2326 * This is used to check for errors when g_socket_connect() is
2327 * used in non-blocking mode.
2329 * Returns: %TRUE if no error, %FALSE otherwise, setting @error to the error
2334 g_socket_check_connect_result (GSocket *socket,
2339 g_return_val_if_fail (G_IS_SOCKET (socket), FALSE);
2341 if (!check_socket (socket, error))
2344 if (!g_socket_get_option (socket, SOL_SOCKET, SO_ERROR, &value, error))
2346 g_prefix_error (error, _("Unable to get pending error: "));
2352 g_set_error_literal (error, G_IO_ERROR, socket_io_error_from_errno (value),
2353 socket_strerror (value));
2354 if (socket->priv->remote_address)
2356 g_object_unref (socket->priv->remote_address);
2357 socket->priv->remote_address = NULL;
2362 socket->priv->connected = TRUE;
2367 * g_socket_get_available_bytes:
2368 * @socket: a #GSocket
2370 * Get the amount of data pending in the OS input buffer.
2372 * Returns: the number of bytes that can be read from the socket
2373 * without blocking or -1 on error.
2378 g_socket_get_available_bytes (GSocket *socket)
2382 g_return_val_if_fail (G_IS_SOCKET (socket), -1);
2385 if (ioctl (socket->priv->fd, FIONREAD, &avail) < 0)
2388 if (ioctlsocket (socket->priv->fd, FIONREAD, &avail) == SOCKET_ERROR)
2397 * @socket: a #GSocket
2398 * @buffer: (array length=size) (element-type guint8): a buffer to
2399 * read data into (which should be at least @size bytes long).
2400 * @size: the number of bytes you want to read from the socket
2401 * @cancellable: (allow-none): a %GCancellable or %NULL
2402 * @error: #GError for error reporting, or %NULL to ignore.
2404 * Receive data (up to @size bytes) from a socket. This is mainly used by
2405 * connection-oriented sockets; it is identical to g_socket_receive_from()
2406 * with @address set to %NULL.
2408 * For %G_SOCKET_TYPE_DATAGRAM and %G_SOCKET_TYPE_SEQPACKET sockets,
2409 * g_socket_receive() will always read either 0 or 1 complete messages from
2410 * the socket. If the received message is too large to fit in @buffer, then
2411 * the data beyond @size bytes will be discarded, without any explicit
2412 * indication that this has occurred.
2414 * For %G_SOCKET_TYPE_STREAM sockets, g_socket_receive() can return any
2415 * number of bytes, up to @size. If more than @size bytes have been
2416 * received, the additional data will be returned in future calls to
2417 * g_socket_receive().
2419 * If the socket is in blocking mode the call will block until there
2420 * is some data to receive, the connection is closed, or there is an
2421 * error. If there is no data available and the socket is in
2422 * non-blocking mode, a %G_IO_ERROR_WOULD_BLOCK error will be
2423 * returned. To be notified when data is available, wait for the
2424 * %G_IO_IN condition.
2426 * On error -1 is returned and @error is set accordingly.
2428 * Returns: Number of bytes read, or 0 if the connection was closed by
2429 * the peer, or -1 on error
2434 g_socket_receive (GSocket *socket,
2437 GCancellable *cancellable,
2440 return g_socket_receive_with_blocking (socket, buffer, size,
2441 socket->priv->blocking,
2442 cancellable, error);
2446 * g_socket_receive_with_blocking:
2447 * @socket: a #GSocket
2448 * @buffer: (array length=size) (element-type guint8): a buffer to
2449 * read data into (which should be at least @size bytes long).
2450 * @size: the number of bytes you want to read from the socket
2451 * @blocking: whether to do blocking or non-blocking I/O
2452 * @cancellable: (allow-none): a %GCancellable or %NULL
2453 * @error: #GError for error reporting, or %NULL to ignore.
2455 * This behaves exactly the same as g_socket_receive(), except that
2456 * the choice of blocking or non-blocking behavior is determined by
2457 * the @blocking argument rather than by @socket's properties.
2459 * Returns: Number of bytes read, or 0 if the connection was closed by
2460 * the peer, or -1 on error
2465 g_socket_receive_with_blocking (GSocket *socket,
2469 GCancellable *cancellable,
2474 g_return_val_if_fail (G_IS_SOCKET (socket) && buffer != NULL, -1);
2476 if (!check_socket (socket, error))
2479 if (g_cancellable_set_error_if_cancelled (cancellable, error))
2485 !g_socket_condition_wait (socket,
2486 G_IO_IN, cancellable, error))
2489 if ((ret = recv (socket->priv->fd, buffer, size, 0)) < 0)
2491 int errsv = get_socket_errno ();
2498 #ifdef WSAEWOULDBLOCK
2499 if (errsv == WSAEWOULDBLOCK)
2502 if (errsv == EWOULDBLOCK ||
2508 win32_unset_event_mask (socket, FD_READ);
2510 g_set_error (error, G_IO_ERROR,
2511 socket_io_error_from_errno (errsv),
2512 _("Error receiving data: %s"), socket_strerror (errsv));
2516 win32_unset_event_mask (socket, FD_READ);
2525 * g_socket_receive_from:
2526 * @socket: a #GSocket
2527 * @address: (out) (allow-none): a pointer to a #GSocketAddress
2529 * @buffer: (array length=size) (element-type guint8): a buffer to
2530 * read data into (which should be at least @size bytes long).
2531 * @size: the number of bytes you want to read from the socket
2532 * @cancellable: (allow-none): a %GCancellable or %NULL
2533 * @error: #GError for error reporting, or %NULL to ignore.
2535 * Receive data (up to @size bytes) from a socket.
2537 * If @address is non-%NULL then @address will be set equal to the
2538 * source address of the received packet.
2539 * @address is owned by the caller.
2541 * See g_socket_receive() for additional information.
2543 * Returns: Number of bytes read, or 0 if the connection was closed by
2544 * the peer, or -1 on error
2549 g_socket_receive_from (GSocket *socket,
2550 GSocketAddress **address,
2553 GCancellable *cancellable,
2561 return g_socket_receive_message (socket,
2569 /* Although we ignore SIGPIPE, gdb will still stop if the app receives
2570 * one, which can be confusing and annoying. So if possible, we want
2571 * to suppress the signal entirely.
2574 #define G_SOCKET_DEFAULT_SEND_FLAGS MSG_NOSIGNAL
2576 #define G_SOCKET_DEFAULT_SEND_FLAGS 0
2581 * @socket: a #GSocket
2582 * @buffer: (array length=size) (element-type guint8): the buffer
2583 * containing the data to send.
2584 * @size: the number of bytes to send
2585 * @cancellable: (allow-none): a %GCancellable or %NULL
2586 * @error: #GError for error reporting, or %NULL to ignore.
2588 * Tries to send @size bytes from @buffer on the socket. This is
2589 * mainly used by connection-oriented sockets; it is identical to
2590 * g_socket_send_to() with @address set to %NULL.
2592 * If the socket is in blocking mode the call will block until there is
2593 * space for the data in the socket queue. If there is no space available
2594 * and the socket is in non-blocking mode a %G_IO_ERROR_WOULD_BLOCK error
2595 * will be returned. To be notified when space is available, wait for the
2596 * %G_IO_OUT condition. Note though that you may still receive
2597 * %G_IO_ERROR_WOULD_BLOCK from g_socket_send() even if you were previously
2598 * notified of a %G_IO_OUT condition. (On Windows in particular, this is
2599 * very common due to the way the underlying APIs work.)
2601 * On error -1 is returned and @error is set accordingly.
2603 * Returns: Number of bytes written (which may be less than @size), or -1
2609 g_socket_send (GSocket *socket,
2610 const gchar *buffer,
2612 GCancellable *cancellable,
2615 return g_socket_send_with_blocking (socket, buffer, size,
2616 socket->priv->blocking,
2617 cancellable, error);
2621 * g_socket_send_with_blocking:
2622 * @socket: a #GSocket
2623 * @buffer: (array length=size) (element-type guint8): the buffer
2624 * containing the data to send.
2625 * @size: the number of bytes to send
2626 * @blocking: whether to do blocking or non-blocking I/O
2627 * @cancellable: (allow-none): a %GCancellable or %NULL
2628 * @error: #GError for error reporting, or %NULL to ignore.
2630 * This behaves exactly the same as g_socket_send(), except that
2631 * the choice of blocking or non-blocking behavior is determined by
2632 * the @blocking argument rather than by @socket's properties.
2634 * Returns: Number of bytes written (which may be less than @size), or -1
2640 g_socket_send_with_blocking (GSocket *socket,
2641 const gchar *buffer,
2644 GCancellable *cancellable,
2649 g_return_val_if_fail (G_IS_SOCKET (socket) && buffer != NULL, -1);
2651 if (!check_socket (socket, error))
2654 if (g_cancellable_set_error_if_cancelled (cancellable, error))
2660 !g_socket_condition_wait (socket,
2661 G_IO_OUT, cancellable, error))
2664 if ((ret = send (socket->priv->fd, buffer, size, G_SOCKET_DEFAULT_SEND_FLAGS)) < 0)
2666 int errsv = get_socket_errno ();
2671 #ifdef WSAEWOULDBLOCK
2672 if (errsv == WSAEWOULDBLOCK)
2673 win32_unset_event_mask (socket, FD_WRITE);
2678 #ifdef WSAEWOULDBLOCK
2679 if (errsv == WSAEWOULDBLOCK)
2682 if (errsv == EWOULDBLOCK ||
2688 g_set_error (error, G_IO_ERROR,
2689 socket_io_error_from_errno (errsv),
2690 _("Error sending data: %s"), socket_strerror (errsv));
2701 * @socket: a #GSocket
2702 * @address: (allow-none): a #GSocketAddress, or %NULL
2703 * @buffer: (array length=size) (element-type guint8): the buffer
2704 * containing the data to send.
2705 * @size: the number of bytes to send
2706 * @cancellable: (allow-none): a %GCancellable or %NULL
2707 * @error: #GError for error reporting, or %NULL to ignore.
2709 * Tries to send @size bytes from @buffer to @address. If @address is
2710 * %NULL then the message is sent to the default receiver (set by
2711 * g_socket_connect()).
2713 * See g_socket_send() for additional information.
2715 * Returns: Number of bytes written (which may be less than @size), or -1
2721 g_socket_send_to (GSocket *socket,
2722 GSocketAddress *address,
2723 const gchar *buffer,
2725 GCancellable *cancellable,
2733 return g_socket_send_message (socket,
2743 * g_socket_shutdown:
2744 * @socket: a #GSocket
2745 * @shutdown_read: whether to shut down the read side
2746 * @shutdown_write: whether to shut down the write side
2747 * @error: #GError for error reporting, or %NULL to ignore.
2749 * Shut down part of a full-duplex connection.
2751 * If @shutdown_read is %TRUE then the receiving side of the connection
2752 * is shut down, and further reading is disallowed.
2754 * If @shutdown_write is %TRUE then the sending side of the connection
2755 * is shut down, and further writing is disallowed.
2757 * It is allowed for both @shutdown_read and @shutdown_write to be %TRUE.
2759 * One example where this is used is graceful disconnect for TCP connections
2760 * where you close the sending side, then wait for the other side to close
2761 * the connection, thus ensuring that the other side saw all sent data.
2763 * Returns: %TRUE on success, %FALSE on error
2768 g_socket_shutdown (GSocket *socket,
2769 gboolean shutdown_read,
2770 gboolean shutdown_write,
2775 g_return_val_if_fail (G_IS_SOCKET (socket), TRUE);
2777 if (!check_socket (socket, error))
2781 if (!shutdown_read && !shutdown_write)
2785 if (shutdown_read && shutdown_write)
2787 else if (shutdown_read)
2792 if (shutdown_read && shutdown_write)
2794 else if (shutdown_read)
2800 if (shutdown (socket->priv->fd, how) != 0)
2802 int errsv = get_socket_errno ();
2803 g_set_error (error, G_IO_ERROR, socket_io_error_from_errno (errsv),
2804 _("Unable to shutdown socket: %s"), socket_strerror (errsv));
2808 if (shutdown_read && shutdown_write)
2809 socket->priv->connected = FALSE;
2816 * @socket: a #GSocket
2817 * @error: #GError for error reporting, or %NULL to ignore.
2819 * Closes the socket, shutting down any active connection.
2821 * Closing a socket does not wait for all outstanding I/O operations
2822 * to finish, so the caller should not rely on them to be guaranteed
2823 * to complete even if the close returns with no error.
2825 * Once the socket is closed, all other operations will return
2826 * %G_IO_ERROR_CLOSED. Closing a socket multiple times will not
2829 * Sockets will be automatically closed when the last reference
2830 * is dropped, but you might want to call this function to make sure
2831 * resources are released as early as possible.
2833 * Beware that due to the way that TCP works, it is possible for
2834 * recently-sent data to be lost if either you close a socket while the
2835 * %G_IO_IN condition is set, or else if the remote connection tries to
2836 * send something to you after you close the socket but before it has
2837 * finished reading all of the data you sent. There is no easy generic
2838 * way to avoid this problem; the easiest fix is to design the network
2839 * protocol such that the client will never send data "out of turn".
2840 * Another solution is for the server to half-close the connection by
2841 * calling g_socket_shutdown() with only the @shutdown_write flag set,
2842 * and then wait for the client to notice this and close its side of the
2843 * connection, after which the server can safely call g_socket_close().
2844 * (This is what #GTcpConnection does if you call
2845 * g_tcp_connection_set_graceful_disconnect(). But of course, this
2846 * only works if the client will close its connection after the server
2849 * Returns: %TRUE on success, %FALSE on error
2854 g_socket_close (GSocket *socket,
2859 g_return_val_if_fail (G_IS_SOCKET (socket), TRUE);
2861 if (socket->priv->closed)
2862 return TRUE; /* Multiple close not an error */
2864 if (!check_socket (socket, error))
2870 res = closesocket (socket->priv->fd);
2872 res = close (socket->priv->fd);
2876 int errsv = get_socket_errno ();
2881 g_set_error (error, G_IO_ERROR,
2882 socket_io_error_from_errno (errsv),
2883 _("Error closing socket: %s"),
2884 socket_strerror (errsv));
2890 socket->priv->connected = FALSE;
2891 socket->priv->closed = TRUE;
2892 if (socket->priv->remote_address)
2894 g_object_unref (socket->priv->remote_address);
2895 socket->priv->remote_address = NULL;
2902 * g_socket_is_closed:
2903 * @socket: a #GSocket
2905 * Checks whether a socket is closed.
2907 * Returns: %TRUE if socket is closed, %FALSE otherwise
2912 g_socket_is_closed (GSocket *socket)
2914 return socket->priv->closed;
2918 /* Broken source, used on errors */
2920 broken_prepare (GSource *source,
2927 broken_check (GSource *source)
2933 broken_dispatch (GSource *source,
2934 GSourceFunc callback,
2940 static GSourceFuncs broken_funcs =
2949 network_events_for_condition (GIOCondition condition)
2953 if (condition & G_IO_IN)
2954 event_mask |= (FD_READ | FD_ACCEPT);
2955 if (condition & G_IO_OUT)
2956 event_mask |= (FD_WRITE | FD_CONNECT);
2957 event_mask |= FD_CLOSE;
2963 ensure_event (GSocket *socket)
2965 if (socket->priv->event == WSA_INVALID_EVENT)
2966 socket->priv->event = WSACreateEvent();
2970 update_select_events (GSocket *socket)
2977 ensure_event (socket);
2980 for (l = socket->priv->requested_conditions; l != NULL; l = l->next)
2983 event_mask |= network_events_for_condition (*ptr);
2986 if (event_mask != socket->priv->selected_events)
2988 /* If no events selected, disable event so we can unset
2991 if (event_mask == 0)
2994 event = socket->priv->event;
2996 if (WSAEventSelect (socket->priv->fd, event, event_mask) == 0)
2997 socket->priv->selected_events = event_mask;
3002 add_condition_watch (GSocket *socket,
3003 GIOCondition *condition)
3005 g_assert (g_list_find (socket->priv->requested_conditions, condition) == NULL);
3007 socket->priv->requested_conditions =
3008 g_list_prepend (socket->priv->requested_conditions, condition);
3010 update_select_events (socket);
3014 remove_condition_watch (GSocket *socket,
3015 GIOCondition *condition)
3017 g_assert (g_list_find (socket->priv->requested_conditions, condition) != NULL);
3019 socket->priv->requested_conditions =
3020 g_list_remove (socket->priv->requested_conditions, condition);
3022 update_select_events (socket);
3026 update_condition (GSocket *socket)
3028 WSANETWORKEVENTS events;
3029 GIOCondition condition;
3031 if (WSAEnumNetworkEvents (socket->priv->fd,
3032 socket->priv->event,
3035 socket->priv->current_events |= events.lNetworkEvents;
3036 if (events.lNetworkEvents & FD_WRITE &&
3037 events.iErrorCode[FD_WRITE_BIT] != 0)
3038 socket->priv->current_errors |= FD_WRITE;
3039 if (events.lNetworkEvents & FD_CONNECT &&
3040 events.iErrorCode[FD_CONNECT_BIT] != 0)
3041 socket->priv->current_errors |= FD_CONNECT;
3045 if (socket->priv->current_events & (FD_READ | FD_ACCEPT))
3046 condition |= G_IO_IN;
3048 if (socket->priv->current_events & FD_CLOSE)
3050 int r, errsv, buffer;
3052 r = recv (socket->priv->fd, &buffer, sizeof (buffer), MSG_PEEK);
3054 errsv = get_socket_errno ();
3057 (r < 0 && errsv == WSAENOTCONN))
3058 condition |= G_IO_IN;
3060 (r < 0 && (errsv == WSAESHUTDOWN || errsv == WSAECONNRESET ||
3061 errsv == WSAECONNABORTED || errsv == WSAENETRESET)))
3062 condition |= G_IO_HUP;
3064 condition |= G_IO_ERR;
3067 if (socket->priv->closed)
3068 condition |= G_IO_HUP;
3070 /* Never report both G_IO_OUT and HUP, these are
3071 mutually exclusive (can't write to a closed socket) */
3072 if ((condition & G_IO_HUP) == 0 &&
3073 socket->priv->current_events & FD_WRITE)
3075 if (socket->priv->current_errors & FD_WRITE)
3076 condition |= G_IO_ERR;
3078 condition |= G_IO_OUT;
3082 if (socket->priv->current_events & FD_CONNECT)
3084 if (socket->priv->current_errors & FD_CONNECT)
3085 condition |= (G_IO_HUP | G_IO_ERR);
3087 condition |= G_IO_OUT;
3099 GIOCondition condition;
3100 GCancellable *cancellable;
3101 GPollFD cancel_pollfd;
3102 gint64 timeout_time;
3106 socket_source_prepare (GSource *source,
3109 GSocketSource *socket_source = (GSocketSource *)source;
3111 if (g_cancellable_is_cancelled (socket_source->cancellable))
3114 if (socket_source->timeout_time)
3118 now = g_source_get_time (source);
3119 /* Round up to ensure that we don't try again too early */
3120 *timeout = (socket_source->timeout_time - now + 999) / 1000;
3123 socket_source->socket->priv->timed_out = TRUE;
3132 socket_source->pollfd.revents = update_condition (socket_source->socket);
3135 if ((socket_source->condition & socket_source->pollfd.revents) != 0)
3142 socket_source_check (GSource *source)
3146 return socket_source_prepare (source, &timeout);
3150 socket_source_dispatch (GSource *source,
3151 GSourceFunc callback,
3154 GSocketSourceFunc func = (GSocketSourceFunc)callback;
3155 GSocketSource *socket_source = (GSocketSource *)source;
3156 GSocket *socket = socket_source->socket;
3160 socket_source->pollfd.revents = update_condition (socket_source->socket);
3162 if (socket_source->socket->priv->timed_out)
3163 socket_source->pollfd.revents |= socket_source->condition & (G_IO_IN | G_IO_OUT);
3165 ret = (*func) (socket,
3166 socket_source->pollfd.revents & socket_source->condition,
3169 if (socket->priv->timeout)
3170 socket_source->timeout_time = g_get_monotonic_time () +
3171 socket->priv->timeout * 1000000;
3174 socket_source->timeout_time = 0;
3180 socket_source_finalize (GSource *source)
3182 GSocketSource *socket_source = (GSocketSource *)source;
3185 socket = socket_source->socket;
3188 remove_condition_watch (socket, &socket_source->condition);
3191 g_object_unref (socket);
3193 if (socket_source->cancellable)
3195 g_cancellable_release_fd (socket_source->cancellable);
3196 g_object_unref (socket_source->cancellable);
3201 socket_source_closure_callback (GSocket *socket,
3202 GIOCondition condition,
3205 GClosure *closure = data;
3207 GValue params[2] = { G_VALUE_INIT, G_VALUE_INIT };
3208 GValue result_value = G_VALUE_INIT;
3211 g_value_init (&result_value, G_TYPE_BOOLEAN);
3213 g_value_init (¶ms[0], G_TYPE_SOCKET);
3214 g_value_set_object (¶ms[0], socket);
3215 g_value_init (¶ms[1], G_TYPE_IO_CONDITION);
3216 g_value_set_flags (¶ms[1], condition);
3218 g_closure_invoke (closure, &result_value, 2, params, NULL);
3220 result = g_value_get_boolean (&result_value);
3221 g_value_unset (&result_value);
3222 g_value_unset (¶ms[0]);
3223 g_value_unset (¶ms[1]);
3228 static GSourceFuncs socket_source_funcs =
3230 socket_source_prepare,
3231 socket_source_check,
3232 socket_source_dispatch,
3233 socket_source_finalize,
3234 (GSourceFunc)socket_source_closure_callback,
3235 (GSourceDummyMarshal)g_cclosure_marshal_generic,
3239 socket_source_new (GSocket *socket,
3240 GIOCondition condition,
3241 GCancellable *cancellable)
3244 GSocketSource *socket_source;
3247 ensure_event (socket);
3249 if (socket->priv->event == WSA_INVALID_EVENT)
3251 g_warning ("Failed to create WSAEvent");
3252 return g_source_new (&broken_funcs, sizeof (GSource));
3256 condition |= G_IO_HUP | G_IO_ERR;
3258 source = g_source_new (&socket_source_funcs, sizeof (GSocketSource));
3259 g_source_set_name (source, "GSocket");
3260 socket_source = (GSocketSource *)source;
3262 socket_source->socket = g_object_ref (socket);
3263 socket_source->condition = condition;
3265 if (g_cancellable_make_pollfd (cancellable,
3266 &socket_source->cancel_pollfd))
3268 socket_source->cancellable = g_object_ref (cancellable);
3269 g_source_add_poll (source, &socket_source->cancel_pollfd);
3273 add_condition_watch (socket, &socket_source->condition);
3274 socket_source->pollfd.fd = (gintptr) socket->priv->event;
3276 socket_source->pollfd.fd = socket->priv->fd;
3279 socket_source->pollfd.events = condition;
3280 socket_source->pollfd.revents = 0;
3281 g_source_add_poll (source, &socket_source->pollfd);
3283 if (socket->priv->timeout)
3284 socket_source->timeout_time = g_get_monotonic_time () +
3285 socket->priv->timeout * 1000000;
3288 socket_source->timeout_time = 0;
3294 * g_socket_create_source: (skip)
3295 * @socket: a #GSocket
3296 * @condition: a #GIOCondition mask to monitor
3297 * @cancellable: (allow-none): a %GCancellable or %NULL
3299 * Creates a %GSource that can be attached to a %GMainContext to monitor
3300 * for the availibility of the specified @condition on the socket.
3302 * The callback on the source is of the #GSocketSourceFunc type.
3304 * It is meaningless to specify %G_IO_ERR or %G_IO_HUP in @condition;
3305 * these conditions will always be reported output if they are true.
3307 * @cancellable if not %NULL can be used to cancel the source, which will
3308 * cause the source to trigger, reporting the current condition (which
3309 * is likely 0 unless cancellation happened at the same time as a
3310 * condition change). You can check for this in the callback using
3311 * g_cancellable_is_cancelled().
3313 * If @socket has a timeout set, and it is reached before @condition
3314 * occurs, the source will then trigger anyway, reporting %G_IO_IN or
3315 * %G_IO_OUT depending on @condition. However, @socket will have been
3316 * marked as having had a timeout, and so the next #GSocket I/O method
3317 * you call will then fail with a %G_IO_ERROR_TIMED_OUT.
3319 * Returns: (transfer full): a newly allocated %GSource, free with g_source_unref().
3324 g_socket_create_source (GSocket *socket,
3325 GIOCondition condition,
3326 GCancellable *cancellable)
3328 g_return_val_if_fail (G_IS_SOCKET (socket) && (cancellable == NULL || G_IS_CANCELLABLE (cancellable)), NULL);
3330 return socket_source_new (socket, condition, cancellable);
3334 * g_socket_condition_check:
3335 * @socket: a #GSocket
3336 * @condition: a #GIOCondition mask to check
3338 * Checks on the readiness of @socket to perform operations.
3339 * The operations specified in @condition are checked for and masked
3340 * against the currently-satisfied conditions on @socket. The result
3343 * Note that on Windows, it is possible for an operation to return
3344 * %G_IO_ERROR_WOULD_BLOCK even immediately after
3345 * g_socket_condition_check() has claimed that the socket is ready for
3346 * writing. Rather than calling g_socket_condition_check() and then
3347 * writing to the socket if it succeeds, it is generally better to
3348 * simply try writing to the socket right away, and try again later if
3349 * the initial attempt returns %G_IO_ERROR_WOULD_BLOCK.
3351 * It is meaningless to specify %G_IO_ERR or %G_IO_HUP in condition;
3352 * these conditions will always be set in the output if they are true.
3354 * This call never blocks.
3356 * Returns: the @GIOCondition mask of the current state
3361 g_socket_condition_check (GSocket *socket,
3362 GIOCondition condition)
3364 g_return_val_if_fail (G_IS_SOCKET (socket), 0);
3366 if (!check_socket (socket, NULL))
3371 GIOCondition current_condition;
3373 condition |= G_IO_ERR | G_IO_HUP;
3375 add_condition_watch (socket, &condition);
3376 current_condition = update_condition (socket);
3377 remove_condition_watch (socket, &condition);
3378 return condition & current_condition;
3384 poll_fd.fd = socket->priv->fd;
3385 poll_fd.events = condition;
3386 poll_fd.revents = 0;
3389 result = g_poll (&poll_fd, 1, 0);
3390 while (result == -1 && get_socket_errno () == EINTR);
3392 return poll_fd.revents;
3398 * g_socket_condition_wait:
3399 * @socket: a #GSocket
3400 * @condition: a #GIOCondition mask to wait for
3401 * @cancellable: (allow-none): a #GCancellable, or %NULL
3402 * @error: a #GError pointer, or %NULL
3404 * Waits for @condition to become true on @socket. When the condition
3405 * is met, %TRUE is returned.
3407 * If @cancellable is cancelled before the condition is met, or if the
3408 * socket has a timeout set and it is reached before the condition is
3409 * met, then %FALSE is returned and @error, if non-%NULL, is set to
3410 * the appropriate value (%G_IO_ERROR_CANCELLED or
3411 * %G_IO_ERROR_TIMED_OUT).
3413 * See also g_socket_condition_timed_wait().
3415 * Returns: %TRUE if the condition was met, %FALSE otherwise
3420 g_socket_condition_wait (GSocket *socket,
3421 GIOCondition condition,
3422 GCancellable *cancellable,
3425 g_return_val_if_fail (G_IS_SOCKET (socket), FALSE);
3427 return g_socket_condition_timed_wait (socket, condition, -1,
3428 cancellable, error);
3432 * g_socket_condition_timed_wait:
3433 * @socket: a #GSocket
3434 * @condition: a #GIOCondition mask to wait for
3435 * @timeout: the maximum time (in microseconds) to wait, or -1
3436 * @cancellable: (allow-none): a #GCancellable, or %NULL
3437 * @error: a #GError pointer, or %NULL
3439 * Waits for up to @timeout microseconds for @condition to become true
3440 * on @socket. If the condition is met, %TRUE is returned.
3442 * If @cancellable is cancelled before the condition is met, or if
3443 * @timeout (or the socket's #GSocket:timeout) is reached before the
3444 * condition is met, then %FALSE is returned and @error, if non-%NULL,
3445 * is set to the appropriate value (%G_IO_ERROR_CANCELLED or
3446 * %G_IO_ERROR_TIMED_OUT).
3448 * If you don't want a timeout, use g_socket_condition_wait().
3449 * (Alternatively, you can pass -1 for @timeout.)
3451 * Note that although @timeout is in microseconds for consistency with
3452 * other GLib APIs, this function actually only has millisecond
3453 * resolution, and the behavior is undefined if @timeout is not an
3454 * exact number of milliseconds.
3456 * Returns: %TRUE if the condition was met, %FALSE otherwise
3461 g_socket_condition_timed_wait (GSocket *socket,
3462 GIOCondition condition,
3464 GCancellable *cancellable,
3469 g_return_val_if_fail (G_IS_SOCKET (socket), FALSE);
3471 if (!check_socket (socket, error))
3474 if (g_cancellable_set_error_if_cancelled (cancellable, error))
3477 if (socket->priv->timeout &&
3478 (timeout < 0 || socket->priv->timeout < timeout / G_USEC_PER_SEC))
3479 timeout = socket->priv->timeout * 1000;
3480 else if (timeout != -1)
3481 timeout = timeout / 1000;
3483 start_time = g_get_monotonic_time ();
3487 GIOCondition current_condition;
3493 /* Always check these */
3494 condition |= G_IO_ERR | G_IO_HUP;
3496 add_condition_watch (socket, &condition);
3499 events[num_events++] = socket->priv->event;
3501 if (g_cancellable_make_pollfd (cancellable, &cancel_fd))
3502 events[num_events++] = (WSAEVENT)cancel_fd.fd;
3505 timeout = WSA_INFINITE;
3507 current_condition = update_condition (socket);
3508 while ((condition & current_condition) == 0)
3510 res = WSAWaitForMultipleEvents (num_events, events,
3511 FALSE, timeout, FALSE);
3512 if (res == WSA_WAIT_FAILED)
3514 int errsv = get_socket_errno ();
3516 g_set_error (error, G_IO_ERROR,
3517 socket_io_error_from_errno (errsv),
3518 _("Waiting for socket condition: %s"),
3519 socket_strerror (errsv));
3522 else if (res == WSA_WAIT_TIMEOUT)
3524 g_set_error_literal (error, G_IO_ERROR, G_IO_ERROR_TIMED_OUT,
3525 _("Socket I/O timed out"));
3529 if (g_cancellable_set_error_if_cancelled (cancellable, error))
3532 current_condition = update_condition (socket);
3534 if (timeout != WSA_INFINITE)
3536 timeout -= (g_get_monotonic_time () - start_time) * 1000;
3541 remove_condition_watch (socket, &condition);
3543 g_cancellable_release_fd (cancellable);
3545 return (condition & current_condition) != 0;
3553 poll_fd[0].fd = socket->priv->fd;
3554 poll_fd[0].events = condition;
3557 if (g_cancellable_make_pollfd (cancellable, &poll_fd[1]))
3562 result = g_poll (poll_fd, num, timeout);
3563 if (result != -1 || errno != EINTR)
3568 timeout -= (g_get_monotonic_time () - start_time) * 1000;
3575 g_cancellable_release_fd (cancellable);
3579 g_set_error_literal (error, G_IO_ERROR, G_IO_ERROR_TIMED_OUT,
3580 _("Socket I/O timed out"));
3584 return !g_cancellable_set_error_if_cancelled (cancellable, error);
3590 * g_socket_send_message:
3591 * @socket: a #GSocket
3592 * @address: (allow-none): a #GSocketAddress, or %NULL
3593 * @vectors: (array length=num_vectors): an array of #GOutputVector structs
3594 * @num_vectors: the number of elements in @vectors, or -1
3595 * @messages: (array length=num_messages) (allow-none): a pointer to an
3596 * array of #GSocketControlMessages, or %NULL.
3597 * @num_messages: number of elements in @messages, or -1.
3598 * @flags: an int containing #GSocketMsgFlags flags
3599 * @cancellable: (allow-none): a %GCancellable or %NULL
3600 * @error: #GError for error reporting, or %NULL to ignore.
3602 * Send data to @address on @socket. This is the most complicated and
3603 * fully-featured version of this call. For easier use, see
3604 * g_socket_send() and g_socket_send_to().
3606 * If @address is %NULL then the message is sent to the default receiver
3607 * (set by g_socket_connect()).
3609 * @vectors must point to an array of #GOutputVector structs and
3610 * @num_vectors must be the length of this array. (If @num_vectors is -1,
3611 * then @vectors is assumed to be terminated by a #GOutputVector with a
3612 * %NULL buffer pointer.) The #GOutputVector structs describe the buffers
3613 * that the sent data will be gathered from. Using multiple
3614 * #GOutputVector<!-- -->s is more memory-efficient than manually copying
3615 * data from multiple sources into a single buffer, and more
3616 * network-efficient than making multiple calls to g_socket_send().
3618 * @messages, if non-%NULL, is taken to point to an array of @num_messages
3619 * #GSocketControlMessage instances. These correspond to the control
3620 * messages to be sent on the socket.
3621 * If @num_messages is -1 then @messages is treated as a %NULL-terminated
3624 * @flags modify how the message is sent. The commonly available arguments
3625 * for this are available in the #GSocketMsgFlags enum, but the
3626 * values there are the same as the system values, and the flags
3627 * are passed in as-is, so you can pass in system-specific flags too.
3629 * If the socket is in blocking mode the call will block until there is
3630 * space for the data in the socket queue. If there is no space available
3631 * and the socket is in non-blocking mode a %G_IO_ERROR_WOULD_BLOCK error
3632 * will be returned. To be notified when space is available, wait for the
3633 * %G_IO_OUT condition. Note though that you may still receive
3634 * %G_IO_ERROR_WOULD_BLOCK from g_socket_send() even if you were previously
3635 * notified of a %G_IO_OUT condition. (On Windows in particular, this is
3636 * very common due to the way the underlying APIs work.)
3638 * On error -1 is returned and @error is set accordingly.
3640 * Returns: Number of bytes written (which may be less than @size), or -1
3646 g_socket_send_message (GSocket *socket,
3647 GSocketAddress *address,
3648 GOutputVector *vectors,
3650 GSocketControlMessage **messages,
3653 GCancellable *cancellable,
3656 GOutputVector one_vector;
3659 g_return_val_if_fail (G_IS_SOCKET (socket), -1);
3661 if (!check_socket (socket, error))
3664 if (g_cancellable_set_error_if_cancelled (cancellable, error))
3667 if (num_vectors == -1)
3669 for (num_vectors = 0;
3670 vectors[num_vectors].buffer != NULL;
3675 if (num_messages == -1)
3677 for (num_messages = 0;
3678 messages != NULL && messages[num_messages] != NULL;
3683 if (num_vectors == 0)
3687 one_vector.buffer = &zero;
3688 one_vector.size = 1;
3690 vectors = &one_vector;
3703 msg.msg_namelen = g_socket_address_get_native_size (address);
3704 msg.msg_name = g_alloca (msg.msg_namelen);
3705 if (!g_socket_address_to_native (address, msg.msg_name, msg.msg_namelen, error))
3710 msg.msg_name = NULL;
3711 msg.msg_namelen = 0;
3716 /* this entire expression will be evaluated at compile time */
3717 if (sizeof *msg.msg_iov == sizeof *vectors &&
3718 sizeof msg.msg_iov->iov_base == sizeof vectors->buffer &&
3719 G_STRUCT_OFFSET (struct iovec, iov_base) ==
3720 G_STRUCT_OFFSET (GOutputVector, buffer) &&
3721 sizeof msg.msg_iov->iov_len == sizeof vectors->size &&
3722 G_STRUCT_OFFSET (struct iovec, iov_len) ==
3723 G_STRUCT_OFFSET (GOutputVector, size))
3724 /* ABI is compatible */
3726 msg.msg_iov = (struct iovec *) vectors;
3727 msg.msg_iovlen = num_vectors;
3730 /* ABI is incompatible */
3734 msg.msg_iov = g_newa (struct iovec, num_vectors);
3735 for (i = 0; i < num_vectors; i++)
3737 msg.msg_iov[i].iov_base = (void *) vectors[i].buffer;
3738 msg.msg_iov[i].iov_len = vectors[i].size;
3740 msg.msg_iovlen = num_vectors;
3746 struct cmsghdr *cmsg;
3749 msg.msg_controllen = 0;
3750 for (i = 0; i < num_messages; i++)
3751 msg.msg_controllen += CMSG_SPACE (g_socket_control_message_get_size (messages[i]));
3753 if (msg.msg_controllen == 0)
3754 msg.msg_control = NULL;
3757 msg.msg_control = g_alloca (msg.msg_controllen);
3758 memset (msg.msg_control, '\0', msg.msg_controllen);
3761 cmsg = CMSG_FIRSTHDR (&msg);
3762 for (i = 0; i < num_messages; i++)
3764 cmsg->cmsg_level = g_socket_control_message_get_level (messages[i]);
3765 cmsg->cmsg_type = g_socket_control_message_get_msg_type (messages[i]);
3766 cmsg->cmsg_len = CMSG_LEN (g_socket_control_message_get_size (messages[i]));
3767 g_socket_control_message_serialize (messages[i],
3769 cmsg = CMSG_NXTHDR (&msg, cmsg);
3771 g_assert (cmsg == NULL);
3776 if (socket->priv->blocking &&
3777 !g_socket_condition_wait (socket,
3778 G_IO_OUT, cancellable, error))
3781 result = sendmsg (socket->priv->fd, &msg, flags | G_SOCKET_DEFAULT_SEND_FLAGS);
3784 int errsv = get_socket_errno ();
3789 if (socket->priv->blocking &&
3790 (errsv == EWOULDBLOCK ||
3794 g_set_error (error, G_IO_ERROR,
3795 socket_io_error_from_errno (errsv),
3796 _("Error sending message: %s"), socket_strerror (errsv));
3807 struct sockaddr_storage addr;
3814 /* Win32 doesn't support control messages.
3815 Actually this is possible for raw and datagram sockets
3816 via WSASendMessage on Vista or later, but that doesn't
3818 if (num_messages != 0)
3820 g_set_error_literal (error, G_IO_ERROR, G_IO_ERROR_NOT_SUPPORTED,
3821 _("GSocketControlMessage not supported on Windows"));
3826 bufs = g_newa (WSABUF, num_vectors);
3827 for (i = 0; i < num_vectors; i++)
3829 bufs[i].buf = (char *)vectors[i].buffer;
3830 bufs[i].len = (gulong)vectors[i].size;
3834 addrlen = 0; /* Avoid warning */
3837 addrlen = g_socket_address_get_native_size (address);
3838 if (!g_socket_address_to_native (address, &addr, sizeof addr, error))
3844 if (socket->priv->blocking &&
3845 !g_socket_condition_wait (socket,
3846 G_IO_OUT, cancellable, error))
3850 result = WSASendTo (socket->priv->fd,
3853 (const struct sockaddr *)&addr, addrlen,
3856 result = WSASend (socket->priv->fd,
3863 int errsv = get_socket_errno ();
3865 if (errsv == WSAEINTR)
3868 if (errsv == WSAEWOULDBLOCK)
3869 win32_unset_event_mask (socket, FD_WRITE);
3871 if (socket->priv->blocking &&
3872 errsv == WSAEWOULDBLOCK)
3875 g_set_error (error, G_IO_ERROR,
3876 socket_io_error_from_errno (errsv),
3877 _("Error sending message: %s"), socket_strerror (errsv));
3889 static GSocketAddress *
3890 cache_recv_address (GSocket *socket, struct sockaddr *native, int native_len)
3892 GSocketAddress *saddr;
3894 guint64 oldest_time = G_MAXUINT64;
3895 gint oldest_index = 0;
3897 if (native_len <= 0)
3901 for (i = 0; i < RECV_ADDR_CACHE_SIZE; i++)
3903 GSocketAddress *tmp = socket->priv->recv_addr_cache[i].addr;
3904 gpointer tmp_native = socket->priv->recv_addr_cache[i].native;
3905 gint tmp_native_len = socket->priv->recv_addr_cache[i].native_len;
3910 if (tmp_native_len != native_len)
3913 if (memcmp (tmp_native, native, native_len) == 0)
3915 saddr = g_object_ref (tmp);
3916 socket->priv->recv_addr_cache[i].last_used = g_get_monotonic_time ();
3920 if (socket->priv->recv_addr_cache[i].last_used < oldest_time)
3922 oldest_time = socket->priv->recv_addr_cache[i].last_used;
3927 saddr = g_socket_address_new_from_native (native, native_len);
3929 if (socket->priv->recv_addr_cache[oldest_index].addr)
3931 g_object_unref (socket->priv->recv_addr_cache[oldest_index].addr);
3932 g_free (socket->priv->recv_addr_cache[oldest_index].native);
3935 socket->priv->recv_addr_cache[oldest_index].native = g_memdup (native, native_len);
3936 socket->priv->recv_addr_cache[oldest_index].native_len = native_len;
3937 socket->priv->recv_addr_cache[oldest_index].addr = g_object_ref (saddr);
3938 socket->priv->recv_addr_cache[oldest_index].last_used = g_get_monotonic_time ();
3944 * g_socket_receive_message:
3945 * @socket: a #GSocket
3946 * @address: (out) (allow-none): a pointer to a #GSocketAddress
3948 * @vectors: (array length=num_vectors): an array of #GInputVector structs
3949 * @num_vectors: the number of elements in @vectors, or -1
3950 * @messages: (array length=num_messages) (allow-none): a pointer which
3951 * may be filled with an array of #GSocketControlMessages, or %NULL
3952 * @num_messages: a pointer which will be filled with the number of
3953 * elements in @messages, or %NULL
3954 * @flags: a pointer to an int containing #GSocketMsgFlags flags
3955 * @cancellable: (allow-none): a %GCancellable or %NULL
3956 * @error: a #GError pointer, or %NULL
3958 * Receive data from a socket. This is the most complicated and
3959 * fully-featured version of this call. For easier use, see
3960 * g_socket_receive() and g_socket_receive_from().
3962 * If @address is non-%NULL then @address will be set equal to the
3963 * source address of the received packet.
3964 * @address is owned by the caller.
3966 * @vector must point to an array of #GInputVector structs and
3967 * @num_vectors must be the length of this array. These structs
3968 * describe the buffers that received data will be scattered into.
3969 * If @num_vectors is -1, then @vectors is assumed to be terminated
3970 * by a #GInputVector with a %NULL buffer pointer.
3972 * As a special case, if @num_vectors is 0 (in which case, @vectors
3973 * may of course be %NULL), then a single byte is received and
3974 * discarded. This is to facilitate the common practice of sending a
3975 * single '\0' byte for the purposes of transferring ancillary data.
3977 * @messages, if non-%NULL, will be set to point to a newly-allocated
3978 * array of #GSocketControlMessage instances or %NULL if no such
3979 * messages was received. These correspond to the control messages
3980 * received from the kernel, one #GSocketControlMessage per message
3981 * from the kernel. This array is %NULL-terminated and must be freed
3982 * by the caller using g_free() after calling g_object_unref() on each
3983 * element. If @messages is %NULL, any control messages received will
3986 * @num_messages, if non-%NULL, will be set to the number of control
3987 * messages received.
3989 * If both @messages and @num_messages are non-%NULL, then
3990 * @num_messages gives the number of #GSocketControlMessage instances
3991 * in @messages (ie: not including the %NULL terminator).
3993 * @flags is an in/out parameter. The commonly available arguments
3994 * for this are available in the #GSocketMsgFlags enum, but the
3995 * values there are the same as the system values, and the flags
3996 * are passed in as-is, so you can pass in system-specific flags too
3997 * (and g_socket_receive_message() may pass system-specific flags out).
3999 * As with g_socket_receive(), data may be discarded if @socket is
4000 * %G_SOCKET_TYPE_DATAGRAM or %G_SOCKET_TYPE_SEQPACKET and you do not
4001 * provide enough buffer space to read a complete message. You can pass
4002 * %G_SOCKET_MSG_PEEK in @flags to peek at the current message without
4003 * removing it from the receive queue, but there is no portable way to find
4004 * out the length of the message other than by reading it into a
4005 * sufficiently-large buffer.
4007 * If the socket is in blocking mode the call will block until there
4008 * is some data to receive, the connection is closed, or there is an
4009 * error. If there is no data available and the socket is in
4010 * non-blocking mode, a %G_IO_ERROR_WOULD_BLOCK error will be
4011 * returned. To be notified when data is available, wait for the
4012 * %G_IO_IN condition.
4014 * On error -1 is returned and @error is set accordingly.
4016 * Returns: Number of bytes read, or 0 if the connection was closed by
4017 * the peer, or -1 on error
4022 g_socket_receive_message (GSocket *socket,
4023 GSocketAddress **address,
4024 GInputVector *vectors,
4026 GSocketControlMessage ***messages,
4029 GCancellable *cancellable,
4032 GInputVector one_vector;
4035 g_return_val_if_fail (G_IS_SOCKET (socket), -1);
4037 if (!check_socket (socket, error))
4040 if (g_cancellable_set_error_if_cancelled (cancellable, error))
4043 if (num_vectors == -1)
4045 for (num_vectors = 0;
4046 vectors[num_vectors].buffer != NULL;
4051 if (num_vectors == 0)
4053 one_vector.buffer = &one_byte;
4054 one_vector.size = 1;
4056 vectors = &one_vector;
4063 struct sockaddr_storage one_sockaddr;
4068 msg.msg_name = &one_sockaddr;
4069 msg.msg_namelen = sizeof (struct sockaddr_storage);
4073 msg.msg_name = NULL;
4074 msg.msg_namelen = 0;
4078 /* this entire expression will be evaluated at compile time */
4079 if (sizeof *msg.msg_iov == sizeof *vectors &&
4080 sizeof msg.msg_iov->iov_base == sizeof vectors->buffer &&
4081 G_STRUCT_OFFSET (struct iovec, iov_base) ==
4082 G_STRUCT_OFFSET (GInputVector, buffer) &&
4083 sizeof msg.msg_iov->iov_len == sizeof vectors->size &&
4084 G_STRUCT_OFFSET (struct iovec, iov_len) ==
4085 G_STRUCT_OFFSET (GInputVector, size))
4086 /* ABI is compatible */
4088 msg.msg_iov = (struct iovec *) vectors;
4089 msg.msg_iovlen = num_vectors;
4092 /* ABI is incompatible */
4096 msg.msg_iov = g_newa (struct iovec, num_vectors);
4097 for (i = 0; i < num_vectors; i++)
4099 msg.msg_iov[i].iov_base = vectors[i].buffer;
4100 msg.msg_iov[i].iov_len = vectors[i].size;
4102 msg.msg_iovlen = num_vectors;
4106 msg.msg_control = g_alloca (2048);
4107 msg.msg_controllen = 2048;
4111 msg.msg_flags = *flags;
4115 /* We always set the close-on-exec flag so we don't leak file
4116 * descriptors into child processes. Note that gunixfdmessage.c
4117 * will later call fcntl (fd, FD_CLOEXEC), but that isn't atomic.
4119 #ifdef MSG_CMSG_CLOEXEC
4120 msg.msg_flags |= MSG_CMSG_CLOEXEC;
4126 if (socket->priv->blocking &&
4127 !g_socket_condition_wait (socket,
4128 G_IO_IN, cancellable, error))
4131 result = recvmsg (socket->priv->fd, &msg, msg.msg_flags);
4132 #ifdef MSG_CMSG_CLOEXEC
4133 if (result < 0 && get_socket_errno () == EINVAL)
4135 /* We must be running on an old kernel. Call without the flag. */
4136 msg.msg_flags &= ~(MSG_CMSG_CLOEXEC);
4137 result = recvmsg (socket->priv->fd, &msg, msg.msg_flags);
4143 int errsv = get_socket_errno ();
4148 if (socket->priv->blocking &&
4149 (errsv == EWOULDBLOCK ||
4153 g_set_error (error, G_IO_ERROR,
4154 socket_io_error_from_errno (errsv),
4155 _("Error receiving message: %s"), socket_strerror (errsv));
4162 /* decode address */
4163 if (address != NULL)
4165 *address = cache_recv_address (socket, msg.msg_name, msg.msg_namelen);
4168 /* decode control messages */
4170 GPtrArray *my_messages = NULL;
4171 struct cmsghdr *cmsg;
4173 if (msg.msg_controllen >= sizeof (struct cmsghdr))
4175 for (cmsg = CMSG_FIRSTHDR (&msg); cmsg; cmsg = CMSG_NXTHDR (&msg, cmsg))
4177 GSocketControlMessage *message;
4179 message = g_socket_control_message_deserialize (cmsg->cmsg_level,
4181 cmsg->cmsg_len - ((char *)CMSG_DATA (cmsg) - (char *)cmsg),
4183 if (message == NULL)
4184 /* We've already spewed about the problem in the
4185 deserialization code, so just continue */
4188 if (messages == NULL)
4190 /* we have to do it this way if the user ignores the
4191 * messages so that we will close any received fds.
4193 g_object_unref (message);
4197 if (my_messages == NULL)
4198 my_messages = g_ptr_array_new ();
4199 g_ptr_array_add (my_messages, message);
4205 *num_messages = my_messages != NULL ? my_messages->len : 0;
4209 if (my_messages == NULL)
4215 g_ptr_array_add (my_messages, NULL);
4216 *messages = (GSocketControlMessage **) g_ptr_array_free (my_messages, FALSE);
4221 g_assert (my_messages == NULL);
4225 /* capture the flags */
4227 *flags = msg.msg_flags;
4233 struct sockaddr_storage addr;
4235 DWORD bytes_received;
4242 bufs = g_newa (WSABUF, num_vectors);
4243 for (i = 0; i < num_vectors; i++)
4245 bufs[i].buf = (char *)vectors[i].buffer;
4246 bufs[i].len = (gulong)vectors[i].size;
4258 if (socket->priv->blocking &&
4259 !g_socket_condition_wait (socket,
4260 G_IO_IN, cancellable, error))
4263 addrlen = sizeof addr;
4265 result = WSARecvFrom (socket->priv->fd,
4267 &bytes_received, &win_flags,
4268 (struct sockaddr *)&addr, &addrlen,
4271 result = WSARecv (socket->priv->fd,
4273 &bytes_received, &win_flags,
4277 int errsv = get_socket_errno ();
4279 if (errsv == WSAEINTR)
4282 win32_unset_event_mask (socket, FD_READ);
4284 if (socket->priv->blocking &&
4285 errsv == WSAEWOULDBLOCK)
4288 g_set_error (error, G_IO_ERROR,
4289 socket_io_error_from_errno (errsv),
4290 _("Error receiving message: %s"), socket_strerror (errsv));
4294 win32_unset_event_mask (socket, FD_READ);
4298 /* decode address */
4299 if (address != NULL)
4301 *address = cache_recv_address (socket, (struct sockaddr *)&addr, addrlen);
4304 /* capture the flags */
4308 if (messages != NULL)
4310 if (num_messages != NULL)
4313 return bytes_received;
4319 * g_socket_get_credentials:
4320 * @socket: a #GSocket.
4321 * @error: #GError for error reporting, or %NULL to ignore.
4323 * Returns the credentials of the foreign process connected to this
4324 * socket, if any (e.g. it is only supported for %G_SOCKET_FAMILY_UNIX
4327 * If this operation isn't supported on the OS, the method fails with
4328 * the %G_IO_ERROR_NOT_SUPPORTED error. On Linux this is implemented
4329 * by reading the %SO_PEERCRED option on the underlying socket.
4331 * Other ways to obtain credentials from a foreign peer includes the
4332 * #GUnixCredentialsMessage type and
4333 * g_unix_connection_send_credentials() /
4334 * g_unix_connection_receive_credentials() functions.
4336 * Returns: (transfer full): %NULL if @error is set, otherwise a #GCredentials object
4337 * that must be freed with g_object_unref().
4342 g_socket_get_credentials (GSocket *socket,
4347 g_return_val_if_fail (G_IS_SOCKET (socket), NULL);
4348 g_return_val_if_fail (error == NULL || *error == NULL, NULL);
4352 #if defined(__linux__) || defined(__OpenBSD__)
4355 #if defined(__linux__)
4356 struct ucred native_creds;
4357 optlen = sizeof (struct ucred);
4358 #elif defined(__OpenBSD__)
4359 struct sockpeercred native_creds;
4360 optlen = sizeof (struct sockpeercred);
4362 if (getsockopt (socket->priv->fd,
4365 (void *)&native_creds,
4368 int errsv = get_socket_errno ();
4371 socket_io_error_from_errno (errsv),
4372 _("Unable to get pending error: %s"),
4373 socket_strerror (errsv));
4377 ret = g_credentials_new ();
4378 g_credentials_set_native (ret,
4379 #if defined(__linux__)
4380 G_CREDENTIALS_TYPE_LINUX_UCRED,
4381 #elif defined(__OpenBSD__)
4382 G_CREDENTIALS_TYPE_OPENBSD_SOCKPEERCRED,
4388 g_set_error_literal (error,
4390 G_IO_ERROR_NOT_SUPPORTED,
4391 _("g_socket_get_credentials not implemented for this OS"));
4398 * g_socket_get_option:
4399 * @socket: a #GSocket
4400 * @level: the "API level" of the option (eg, <literal>SOL_SOCKET</literal>)
4401 * @optname: the "name" of the option (eg, <literal>SO_BROADCAST</literal>)
4402 * @value: (out): return location for the option value
4403 * @error: #GError for error reporting, or %NULL to ignore.
4405 * Gets the value of an integer-valued option on @socket, as with
4406 * <literal>getsockopt ()</literal>. (If you need to fetch a
4407 * non-integer-valued option, you will need to call
4408 * <literal>getsockopt ()</literal> directly.)
4410 * The <link linkend="gio-gnetworking.h"><literal><gio/gnetworking.h></literal></link>
4411 * header pulls in system headers that will define most of the
4412 * standard/portable socket options. For unusual socket protocols or
4413 * platform-dependent options, you may need to include additional
4416 * Note that even for socket options that are a single byte in size,
4417 * @value is still a pointer to a #gint variable, not a #guchar;
4418 * g_socket_get_option() will handle the conversion internally.
4420 * Returns: success or failure. On failure, @error will be set, and
4421 * the system error value (<literal>errno</literal> or
4422 * <literal>WSAGetLastError ()</literal>) will still be set to the
4423 * result of the <literal>getsockopt ()</literal> call.
4428 g_socket_get_option (GSocket *socket,
4436 g_return_val_if_fail (G_IS_SOCKET (socket), FALSE);
4439 size = sizeof (gint);
4440 if (getsockopt (socket->priv->fd, level, optname, value, &size) != 0)
4442 int errsv = get_socket_errno ();
4444 g_set_error_literal (error,
4446 socket_io_error_from_errno (errsv),
4447 socket_strerror (errsv));
4449 /* Reset errno in case the caller wants to look at it */
4455 #if G_BYTE_ORDER == G_BIG_ENDIAN
4456 /* If the returned value is smaller than an int then we need to
4457 * slide it over into the low-order bytes of *value.
4459 if (size != sizeof (gint))
4460 *value = *value >> (8 * (sizeof (gint) - size));
4467 * g_socket_set_option:
4468 * @socket: a #GSocket
4469 * @level: the "API level" of the option (eg, <literal>SOL_SOCKET</literal>)
4470 * @optname: the "name" of the option (eg, <literal>SO_BROADCAST</literal>)
4471 * @value: the value to set the option to
4472 * @error: #GError for error reporting, or %NULL to ignore.
4474 * Sets the value of an integer-valued option on @socket, as with
4475 * <literal>setsockopt ()</literal>. (If you need to set a
4476 * non-integer-valued option, you will need to call
4477 * <literal>setsockopt ()</literal> directly.)
4479 * The <link linkend="gio-gnetworking.h"><literal><gio/gnetworking.h></literal></link>
4480 * header pulls in system headers that will define most of the
4481 * standard/portable socket options. For unusual socket protocols or
4482 * platform-dependent options, you may need to include additional
4485 * Returns: success or failure. On failure, @error will be set, and
4486 * the system error value (<literal>errno</literal> or
4487 * <literal>WSAGetLastError ()</literal>) will still be set to the
4488 * result of the <literal>setsockopt ()</literal> call.
4493 g_socket_set_option (GSocket *socket,
4501 g_return_val_if_fail (G_IS_SOCKET (socket), FALSE);
4503 if (setsockopt (socket->priv->fd, level, optname, &value, sizeof (gint)) == 0)
4506 #if !defined (__linux__) && !defined (G_OS_WIN32)
4507 /* Linux and Windows let you set a single-byte value from an int,
4508 * but most other platforms don't.
4510 if (errno == EINVAL && value >= SCHAR_MIN && value <= CHAR_MAX)
4512 #if G_BYTE_ORDER == G_BIG_ENDIAN
4513 value = value << (8 * (sizeof (gint) - 1));
4515 if (setsockopt (socket->priv->fd, level, optname, &value, 1) == 0)
4520 errsv = get_socket_errno ();
4522 g_set_error_literal (error,
4524 socket_io_error_from_errno (errsv),
4525 socket_strerror (errsv));