/gio/gsocket.c

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/* GIO - GLib Input, Output and Streaming Library
 *
 * Copyright (C) 2008 Christian Kellner, Samuel Cormier-Iijima
 * Copyright © 2009 Codethink Limited
 * Copyright © 2009 Red Hat, Inc
 * Copyright © 2015 Collabora, Ltd.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General
 * Public License along with this library; if not, see <http://www.gnu.org/licenses/>.
 *
 * Authors: Christian Kellner <gicmo@gnome.org>
 *          Samuel Cormier-Iijima <sciyoshi@gmail.com>
 *          Ryan Lortie <desrt@desrt.ca>
 *          Alexander Larsson <alexl@redhat.com>
 *          Philip Withnall <philip.withnall@collabora.co.uk>
 */

#include "config.h"

#include "gsocket.h"

#ifdef G_OS_UNIX
#include "glib-unix.h"
#endif

#include <errno.h>
#include <signal.h>
#include <string.h>
#include <stdlib.h>

#ifndef G_OS_WIN32
# include <fcntl.h>
# include <unistd.h>
# include <sys/ioctl.h>
#endif

#ifdef HAVE_SYS_FILIO_H
# include <sys/filio.h>
#endif

#ifdef G_OS_UNIX
#include <sys/uio.h>
#endif

#define GOBJECT_COMPILATION
#include "gobject/gtype-private.h" /* For _PRELUDE type define */
#undef GOBJECT_COMPILATION
#include "gcancellable.h"
#include "gdatagrambased.h"
#include "gioenumtypes.h"
#include "ginetaddress.h"
#include "ginitable.h"
#include "gioerror.h"
#include "gioenums.h"
#include "gioerror.h"
#include "gnetworkingprivate.h"
#include "gsocketaddress.h"
#include "gsocketcontrolmessage.h"
#include "gcredentials.h"
#include "gcredentialsprivate.h"
#include "glibintl.h"

#ifdef G_OS_WIN32
/* For Windows XP runtime compatibility, but use the system's if_nametoindex() if available */
#include "gwin32networking.h"
#endif

/**
 * SECTION:gsocket
 * @short_description: Low-level socket object
 * @include: gio/gio.h
 * @see_also: #GInitable, [<gnetworking.h>][gio-gnetworking.h]
 *
 * A #GSocket is a low-level networking primitive. It is a more or less
 * direct mapping of the BSD socket API in a portable GObject based API.
 * It supports both the UNIX socket implementations and winsock2 on Windows.
 *
 * #GSocket is the platform independent base upon which the higher level
 * network primitives are based. Applications are not typically meant to
 * use it directly, but rather through classes like #GSocketClient,
 * #GSocketService and #GSocketConnection. However there may be cases where
 * direct use of #GSocket is useful.
 *
 * #GSocket implements the #GInitable interface, so if it is manually constructed
 * by e.g. g_object_new() you must call g_initable_init() and check the
 * results before using the object. This is done automatically in
 * g_socket_new() and g_socket_new_from_fd(), so these functions can return
 * %NULL.
 *
 * Sockets operate in two general modes, blocking or non-blocking. When
 * in blocking mode all operations (which don’t take an explicit blocking
 * parameter) block until the requested operation
 * is finished or there is an error. In non-blocking mode all calls that
 * would block return immediately with a %G_IO_ERROR_WOULD_BLOCK error.
 * To know when a call would successfully run you can call g_socket_condition_check(),
 * or g_socket_condition_wait(). You can also use g_socket_create_source() and
 * attach it to a #GMainContext to get callbacks when I/O is possible.
 * Note that all sockets are always set to non blocking mode in the system, and
 * blocking mode is emulated in GSocket.
 *
 * When working in non-blocking mode applications should always be able to
 * handle getting a %G_IO_ERROR_WOULD_BLOCK error even when some other
 * function said that I/O was possible. This can easily happen in case
 * of a race condition in the application, but it can also happen for other
 * reasons. For instance, on Windows a socket is always seen as writable
 * until a write returns %G_IO_ERROR_WOULD_BLOCK.
 *
 * #GSockets can be either connection oriented or datagram based.
 * For connection oriented types you must first establish a connection by
 * either connecting to an address or accepting a connection from another
 * address. For connectionless socket types the target/source address is
 * specified or received in each I/O operation.
 *
 * All socket file descriptors are set to be close-on-exec.
 *
 * Note that creating a #GSocket causes the signal %SIGPIPE to be
 * ignored for the remainder of the program. If you are writing a
 * command-line utility that uses #GSocket, you may need to take into
 * account the fact that your program will not automatically be killed
 * if it tries to write to %stdout after it has been closed.
 *
 * Like most other APIs in GLib, #GSocket is not inherently thread safe. To use
 * a #GSocket concurrently from multiple threads, you must implement your own
 * locking.
 *
 * Since: 2.22
 */

static void     g_socket_initable_iface_init (GInitableIface  *iface);
static gboolean g_socket_initable_init       (GInitable       *initable,
					      GCancellable    *cancellable,
					      GError         **error);

static void     g_socket_datagram_based_iface_init       (GDatagramBasedInterface *iface);
static gint     g_socket_datagram_based_receive_messages (GDatagramBased  *self,
                                                          GInputMessage   *messages,
                                                          guint            num_messages,
                                                          gint             flags,
                                                          gint64           timeout,
                                                          GCancellable    *cancellable,
                                                          GError         **error);
static gint     g_socket_datagram_based_send_messages    (GDatagramBased  *self,
                                                          GOutputMessage  *messages,
                                                          guint            num_messages,
                                                          gint             flags,
                                                          gint64           timeout,
                                                          GCancellable    *cancellable,
                                                          GError         **error);
static GSource *g_socket_datagram_based_create_source    (GDatagramBased           *self,
                                                          GIOCondition              condition,
                                                          GCancellable             *cancellable);
static GIOCondition g_socket_datagram_based_condition_check      (GDatagramBased   *datagram_based,
                                                                  GIOCondition      condition);
static gboolean     g_socket_datagram_based_condition_wait       (GDatagramBased   *datagram_based,
                                                                  GIOCondition      condition,
                                                                  gint64            timeout,
                                                                  GCancellable     *cancellable,
                                                                  GError          **error);

static GSocketAddress *
cache_recv_address (GSocket *socket, struct sockaddr *native, int native_len);

static gssize
g_socket_receive_message_with_timeout  (GSocket                 *socket,
                                        GSocketAddress         **address,
                                        GInputVector            *vectors,
                                        gint                     num_vectors,
                                        GSocketControlMessage ***messages,
                                        gint                    *num_messages,
                                        gint                    *flags,
                                        gint64                   timeout,
                                        GCancellable            *cancellable,
                                        GError                 **error);
static gint
g_socket_receive_messages_with_timeout (GSocket        *socket,
                                        GInputMessage  *messages,
                                        guint           num_messages,
                                        gint            flags,
                                        gint64          timeout,
                                        GCancellable   *cancellable,
                                        GError        **error);
static gssize
g_socket_send_message_with_timeout     (GSocket                 *socket,
                                        GSocketAddress          *address,
                                        GOutputVector           *vectors,
                                        gint                     num_vectors,
                                        GSocketControlMessage  **messages,
                                        gint                     num_messages,
                                        gint                     flags,
                                        gint64                   timeout,
                                        GCancellable            *cancellable,
                                        GError                 **error);
static gint
g_socket_send_messages_with_timeout    (GSocket        *socket,
                                        GOutputMessage *messages,
                                        guint           num_messages,
                                        gint            flags,
                                        gint64          timeout,
                                        GCancellable   *cancellable,
                                        GError        **error);

enum
{
  PROP_0,
  PROP_FAMILY,
  PROP_TYPE,
  PROP_PROTOCOL,
  PROP_FD,
  PROP_BLOCKING,
  PROP_LISTEN_BACKLOG,
  PROP_KEEPALIVE,
  PROP_LOCAL_ADDRESS,
  PROP_REMOTE_ADDRESS,
  PROP_TIMEOUT,
  PROP_TTL,
  PROP_BROADCAST,
  PROP_MULTICAST_LOOPBACK,
  PROP_MULTICAST_TTL
};

/* Size of the receiver cache for g_socket_receive_from() */
#define RECV_ADDR_CACHE_SIZE 8

struct _GSocketPrivate
{
  GSocketFamily   family;
  GSocketType     type;
  GSocketProtocol protocol;
  gint            fd;
  gint            listen_backlog;
  guint           timeout;
  GError         *construct_error;
  GSocketAddress *remote_address;
  guint           inited : 1;
  guint           blocking : 1;
  guint           keepalive : 1;
  guint           closed : 1;
  guint           connected_read : 1;
  guint           connected_write : 1;
  guint           listening : 1;
  guint           timed_out : 1;
  guint           connect_pending : 1;
#ifdef G_OS_WIN32
  WSAEVENT        event;
  gboolean        waiting;
  DWORD           waiting_result;
  int             current_events;
  int             current_errors;
  int             selected_events;
  GList          *requested_conditions; /* list of requested GIOCondition * */
  GMutex          win32_source_lock;
  GCond           win32_source_cond;
#endif

  struct {
    GSocketAddress *addr;
    struct sockaddr *native;
    gint native_len;
    guint64 last_used;
  } recv_addr_cache[RECV_ADDR_CACHE_SIZE];
};

_G_DEFINE_TYPE_EXTENDED_WITH_PRELUDE (GSocket, g_socket, G_TYPE_OBJECT, 0,
                                      /* Need a prelude for https://bugzilla.gnome.org/show_bug.cgi?id=674885 */
                                      g_type_ensure (G_TYPE_SOCKET_FAMILY);
                                      g_type_ensure (G_TYPE_SOCKET_TYPE);
                                      g_type_ensure (G_TYPE_SOCKET_PROTOCOL);
                                      g_type_ensure (G_TYPE_SOCKET_ADDRESS);
                                      /* And networking init is appropriate for the prelude */
                                      g_networking_init ();
                                      , /* And now the regular type init code */
                                      G_ADD_PRIVATE (GSocket)
                                      G_IMPLEMENT_INTERFACE (G_TYPE_INITABLE,
                                                             g_socket_initable_iface_init);
                                      G_IMPLEMENT_INTERFACE (G_TYPE_DATAGRAM_BASED,
                                                             g_socket_datagram_based_iface_init));

static int
get_socket_errno (void)
{
#ifndef G_OS_WIN32
  return errno;
#else
  return WSAGetLastError ();
#endif
}

static GIOErrorEnum
socket_io_error_from_errno (int err)
{
#ifdef G_OS_WIN32
  return g_io_error_from_win32_error (err);
#else
  return g_io_error_from_errno (err);
#endif
}

static const char *
socket_strerror (int err)
{
#ifndef G_OS_WIN32
  return g_strerror (err);
#else
  const char *msg_ret;
  char *msg;

  msg = g_win32_error_message (err);

  msg_ret = g_intern_string (msg);
  g_free (msg);

  return msg_ret;
#endif
}

/* Wrapper around g_set_error() to avoid doing excess work */
#define socket_set_error_lazy(err, errsv, fmt)                          \
  G_STMT_START {                                                        \
    GError **__err = (err);                                             \
    int __errsv = (errsv);                                              \
                                                                        \
    if (__err)                                                          \
      {                                                                 \
        int __code = socket_io_error_from_errno (__errsv);              \
        const char *__strerr = socket_strerror (__errsv);               \
                                                                        \
        if (__code == G_IO_ERROR_WOULD_BLOCK)                           \
          g_set_error_literal (__err, G_IO_ERROR, __code, __strerr);    \
        else                                                            \
          g_set_error (__err, G_IO_ERROR, __code, fmt, __strerr);       \
      }                                                                 \
  } G_STMT_END

#ifdef G_OS_WIN32
#define win32_unset_event_mask(_socket, _mask) _win32_unset_event_mask (_socket, _mask)
static void
_win32_unset_event_mask (GSocket *socket, int mask)
{
  g_mutex_lock (&socket->priv->win32_source_lock);
  socket->priv->current_events &= ~mask;
  socket->priv->current_errors &= ~mask;
  g_mutex_unlock (&socket->priv->win32_source_lock);
}
#else
#define win32_unset_event_mask(_socket, _mask)
#endif

/* Windows has broken prototypes... */
#ifdef G_OS_WIN32
#define getsockopt(sockfd, level, optname, optval, optlen) \
  getsockopt (sockfd, level, optname, (gpointer) optval, (int*) optlen)
#define setsockopt(sockfd, level, optname, optval, optlen) \
  setsockopt (sockfd, level, optname, (gpointer) optval, optlen)
#define getsockname(sockfd, addr, addrlen) \
  getsockname (sockfd, addr, (int *)addrlen)
#define getpeername(sockfd, addr, addrlen) \
  getpeername (sockfd, addr, (int *)addrlen)
#define recv(sockfd, buf, len, flags) \
  recv (sockfd, (gpointer)buf, len, flags)
#endif

static gboolean
check_socket (GSocket *socket,
	      GError **error)
{
  if (!socket->priv->inited)
    {
      g_set_error_literal (error, G_IO_ERROR, G_IO_ERROR_NOT_INITIALIZED,
                           _("Invalid socket, not initialized"));
      return FALSE;
    }

  if (socket->priv->construct_error)
    {
      g_set_error (error, G_IO_ERROR, G_IO_ERROR_NOT_INITIALIZED,
		   _("Invalid socket, initialization failed due to: %s"),
		   socket->priv->construct_error->message);
      return FALSE;
    }

  if (socket->priv->closed)
    {
      g_set_error_literal (error, G_IO_ERROR, G_IO_ERROR_CLOSED,
			   _("Socket is already closed"));
      return FALSE;
    }

  return TRUE;
}

static gboolean
check_timeout (GSocket *socket,
	       GError **error)
{
  if (socket->priv->timed_out)
    {
      socket->priv->timed_out = FALSE;
      g_set_error_literal (error, G_IO_ERROR, G_IO_ERROR_TIMED_OUT,
			   _("Socket I/O timed out"));
      return FALSE;
    }

  return TRUE;
}

static void
g_socket_details_from_fd (GSocket *socket)
{
  struct sockaddr_storage address;
  gint fd;
  guint addrlen;
  int value, family;
  int errsv;

  fd = socket->priv->fd;
  if (!g_socket_get_option (socket, SOL_SOCKET, SO_TYPE, &value, NULL))
    {
      errsv = get_socket_errno ();
      goto err;
    }

  switch (value)
    {
     case SOCK_STREAM:
      socket->priv->type = G_SOCKET_TYPE_STREAM;
      break;

     case SOCK_DGRAM:
      socket->priv->type = G_SOCKET_TYPE_DATAGRAM;
      break;

     case SOCK_SEQPACKET:
      socket->priv->type = G_SOCKET_TYPE_SEQPACKET;
      break;

     default:
      socket->priv->type = G_SOCKET_TYPE_INVALID;
      break;
    }

  addrlen = sizeof address;
  if (getsockname (fd, (struct sockaddr *) &address, &addrlen) != 0)
    {
      errsv = get_socket_errno ();
      goto err;
    }

  if (addrlen > 0)
    {
      g_assert (G_STRUCT_OFFSET (struct sockaddr, sa_family) +
		sizeof address.ss_family <= addrlen);
      family = address.ss_family;
    }
  else
    {
      /* On Solaris, this happens if the socket is not yet connected.
       * But we can use SO_DOMAIN as a workaround there.
       */
#ifdef SO_DOMAIN
      if (!g_socket_get_option (socket, SOL_SOCKET, SO_DOMAIN, &family, NULL))
	{
	  errsv = get_socket_errno ();
	  goto err;
	}
#else
      /* This will translate to G_IO_ERROR_FAILED on either unix or windows */
      errsv = -1;
      goto err;
#endif
    }

  switch (family)
    {
     case G_SOCKET_FAMILY_IPV4:
     case G_SOCKET_FAMILY_IPV6:
       socket->priv->family = address.ss_family;
       switch (socket->priv->type)
	 {
	 case G_SOCKET_TYPE_STREAM:
	   socket->priv->protocol = G_SOCKET_PROTOCOL_TCP;
	   break;

	 case G_SOCKET_TYPE_DATAGRAM:
	   socket->priv->protocol = G_SOCKET_PROTOCOL_UDP;
	   break;

	 case G_SOCKET_TYPE_SEQPACKET:
	   socket->priv->protocol = G_SOCKET_PROTOCOL_SCTP;
	   break;

	 default:
	   break;
	 }
       break;

     case G_SOCKET_FAMILY_UNIX:
       socket->priv->family = G_SOCKET_FAMILY_UNIX;
       socket->priv->protocol = G_SOCKET_PROTOCOL_DEFAULT;
       break;

     default:
       socket->priv->family = G_SOCKET_FAMILY_INVALID;
       break;
    }

  if (socket->priv->family != G_SOCKET_FAMILY_INVALID)
    {
      addrlen = sizeof address;
      if (getpeername (fd, (struct sockaddr *) &address, &addrlen) >= 0)
        {
          socket->priv->connected_read = TRUE;
          socket->priv->connected_write = TRUE;
        }
    }

  if (g_socket_get_option (socket, SOL_SOCKET, SO_KEEPALIVE, &value, NULL))
    {
      socket->priv->keepalive = !!value;
    }
  else
    {
      /* Can't read, maybe not supported, assume FALSE */
      socket->priv->keepalive = FALSE;
    }

  return;

 err:
  g_set_error (&socket->priv->construct_error, G_IO_ERROR,
	       socket_io_error_from_errno (errsv),
	       _("creating GSocket from fd: %s"),
	       socket_strerror (errsv));
}

/* Wrapper around socket() that is shared with gnetworkmonitornetlink.c */
gint
g_socket (gint     domain,
          gint     type,
          gint     protocol,
          GError **error)
{
  int fd, errsv;

#ifdef SOCK_CLOEXEC
  fd = socket (domain, type | SOCK_CLOEXEC, protocol);
  errsv = errno;
  if (fd != -1)
    return fd;

  /* It's possible that libc has SOCK_CLOEXEC but the kernel does not */
  if (fd < 0 && (errsv == EINVAL || errsv == EPROTOTYPE))
#endif
    fd = socket (domain, type, protocol);

  if (fd < 0)
    {
      int errsv = get_socket_errno ();

      g_set_error (error, G_IO_ERROR, socket_io_error_from_errno (errsv),
		   _("Unable to create socket: %s"), socket_strerror (errsv));
      errno = errsv;
      return -1;
    }

#ifndef G_OS_WIN32
  {
    int flags;

    /* We always want to set close-on-exec to protect users. If you
       need to so some weird inheritance to exec you can re-enable this
       using lower level hacks with g_socket_get_fd(). */
    flags = fcntl (fd, F_GETFD, 0);
    if (flags != -1 &&
	(flags & FD_CLOEXEC) == 0)
      {
	flags |= FD_CLOEXEC;
	fcntl (fd, F_SETFD, flags);
      }
  }
#endif

  return fd;
}

static gint
g_socket_create_socket (GSocketFamily   family,
			GSocketType     type,
			int             protocol,
			GError        **error)
{
  gint native_type;

  switch (type)
    {
     case G_SOCKET_TYPE_STREAM:
      native_type = SOCK_STREAM;
      break;

     case G_SOCKET_TYPE_DATAGRAM:
      native_type = SOCK_DGRAM;
      break;

     case G_SOCKET_TYPE_SEQPACKET:
      native_type = SOCK_SEQPACKET;
      break;

     default:
      g_assert_not_reached ();
    }

  if (family <= 0)
    {
      g_set_error (error, G_IO_ERROR, G_IO_ERROR_INVALID_ARGUMENT,
                   _("Unable to create socket: %s"), _("Unknown family was specified"));
      return -1;
    }

  if (protocol == -1)
    {
      g_set_error (error, G_IO_ERROR, G_IO_ERROR_INVALID_ARGUMENT,
		   _("Unable to create socket: %s"), _("Unknown protocol was specified"));
      return -1;
    }

  return g_socket (family, native_type, protocol, error);
}

static void
g_socket_constructed (GObject *object)
{
  GSocket *socket = G_SOCKET (object);

  if (socket->priv->fd >= 0)
    /* create socket->priv info from the fd */
    g_socket_details_from_fd (socket);

  else
    /* create the fd from socket->priv info */
    socket->priv->fd = g_socket_create_socket (socket->priv->family,
					       socket->priv->type,
					       socket->priv->protocol,
					       &socket->priv->construct_error);

  if (socket->priv->fd != -1)
    {
#ifndef G_OS_WIN32
      GError *error = NULL;
#else
      gulong arg;
#endif

      /* Always use native nonblocking sockets, as Windows sets sockets to
       * nonblocking automatically in certain operations. This way we make
       * things work the same on all platforms.
       */
#ifndef G_OS_WIN32
      if (!g_unix_set_fd_nonblocking (socket->priv->fd, TRUE, &error))
        {
          g_warning ("Error setting socket nonblocking: %s", error->message);
          g_clear_error (&error);
        }
#else
      arg = TRUE;

      if (ioctlsocket (socket->priv->fd, FIONBIO, &arg) == SOCKET_ERROR)
        {
          int errsv = get_socket_errno ();
          g_warning ("Error setting socket status flags: %s", socket_strerror (errsv));
        }
#endif

#ifdef SO_NOSIGPIPE
      /* See note about SIGPIPE below. */
      g_socket_set_option (socket, SOL_SOCKET, SO_NOSIGPIPE, TRUE, NULL);
#endif
    }
}

static void
g_socket_get_property (GObject    *object,
		       guint       prop_id,
		       GValue     *value,
		       GParamSpec *pspec)
{
  GSocket *socket = G_SOCKET (object);
  GSocketAddress *address;

  switch (prop_id)
    {
      case PROP_FAMILY:
	g_value_set_enum (value, socket->priv->family);
	break;

      case PROP_TYPE:
	g_value_set_enum (value, socket->priv->type);
	break;

      case PROP_PROTOCOL:
	g_value_set_enum (value, socket->priv->protocol);
	break;

      case PROP_FD:
	g_value_set_int (value, socket->priv->fd);
	break;

      case PROP_BLOCKING:
	g_value_set_boolean (value, socket->priv->blocking);
	break;

      case PROP_LISTEN_BACKLOG:
	g_value_set_int (value, socket->priv->listen_backlog);
	break;

      case PROP_KEEPALIVE:
	g_value_set_boolean (value, socket->priv->keepalive);
	break;

      case PROP_LOCAL_ADDRESS:
	address = g_socket_get_local_address (socket, NULL);
	g_value_take_object (value, address);
	break;

      case PROP_REMOTE_ADDRESS:
	address = g_socket_get_remote_address (socket, NULL);
	g_value_take_object (value, address);
	break;

      case PROP_TIMEOUT:
	g_value_set_uint (value, socket->priv->timeout);
	break;

      case PROP_TTL:
	g_value_set_uint (value, g_socket_get_ttl (socket));
	break;

      case PROP_BROADCAST:
	g_value_set_boolean (value, g_socket_get_broadcast (socket));
	break;

      case PROP_MULTICAST_LOOPBACK:
	g_value_set_boolean (value, g_socket_get_multicast_loopback (socket));
	break;

      case PROP_MULTICAST_TTL:
	g_value_set_uint (value, g_socket_get_multicast_ttl (socket));
	break;

      default:
	G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
    }
}

static void
g_socket_set_property (GObject      *object,
		       guint         prop_id,
		       const GValue *value,
		       GParamSpec   *pspec)
{
  GSocket *socket = G_SOCKET (object);

  switch (prop_id)
    {
      case PROP_FAMILY:
	socket->priv->family = g_value_get_enum (value);
	break;

      case PROP_TYPE:
	socket->priv->type = g_value_get_enum (value);
	break;

      case PROP_PROTOCOL:
	socket->priv->protocol = g_value_get_enum (value);
	break;

      case PROP_FD:
	socket->priv->fd = g_value_get_int (value);
	break;

      case PROP_BLOCKING:
	g_socket_set_blocking (socket, g_value_get_boolean (value));
	break;

      case PROP_LISTEN_BACKLOG:
	g_socket_set_listen_backlog (socket, g_value_get_int (value));
	break;

      case PROP_KEEPALIVE:
	g_socket_set_keepalive (socket, g_value_get_boolean (value));
	break;

      case PROP_TIMEOUT:
	g_socket_set_timeout (socket, g_value_get_uint (value));
	break;

      case PROP_TTL:
	g_socket_set_ttl (socket, g_value_get_uint (value));
	break;

      case PROP_BROADCAST:
	g_socket_set_broadcast (socket, g_value_get_boolean (value));
	break;

      case PROP_MULTICAST_LOOPBACK:
	g_socket_set_multicast_loopback (socket, g_value_get_boolean (value));
	break;

      case PROP_MULTICAST_TTL:
	g_socket_set_multicast_ttl (socket, g_value_get_uint (value));
	break;

      default:
	G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
    }
}

static void
g_socket_finalize (GObject *object)
{
  GSocket *socket = G_SOCKET (object);
  gint i;

  g_clear_error (&socket->priv->construct_error);

  if (socket->priv->fd != -1 &&
      !socket->priv->closed)
    g_socket_close (socket, NULL);

  if (socket->priv->remote_address)
    g_object_unref (socket->priv->remote_address);

#ifdef G_OS_WIN32
  if (socket->priv->event != WSA_INVALID_EVENT)
    {
      WSACloseEvent (socket->priv->event);
      socket->priv->event = WSA_INVALID_EVENT;
    }

  g_assert (socket->priv->requested_conditions == NULL);
  g_mutex_clear (&socket->priv->win32_source_lock);
  g_cond_clear (&socket->priv->win32_source_cond);
#endif

  for (i = 0; i < RECV_ADDR_CACHE_SIZE; i++)
    {
      if (socket->priv->recv_addr_cache[i].addr)
        {
          g_object_unref (socket->priv->recv_addr_cache[i].addr);
          g_free (socket->priv->recv_addr_cache[i].native);
        }
    }

  if (G_OBJECT_CLASS (g_socket_parent_class)->finalize)
    (*G_OBJECT_CLASS (g_socket_parent_class)->finalize) (object);
}

static void
g_socket_class_init (GSocketClass *klass)
{
  GObjectClass *gobject_class G_GNUC_UNUSED = G_OBJECT_CLASS (klass);

#ifdef SIGPIPE
  /* There is no portable, thread-safe way to avoid having the process
   * be killed by SIGPIPE when calling send() or sendmsg(), so we are
   * forced to simply ignore the signal process-wide.
   *
   * Even if we ignore it though, gdb will still stop if the app
   * receives a SIGPIPE, which can be confusing and annoying. So when
   * possible, we also use MSG_NOSIGNAL / SO_NOSIGPIPE elsewhere to
   * prevent the signal from occurring at all.
   */
  signal (SIGPIPE, SIG_IGN);
#endif

  gobject_class->finalize = g_socket_finalize;
  gobject_class->constructed = g_socket_constructed;
  gobject_class->set_property = g_socket_set_property;
  gobject_class->get_property = g_socket_get_property;

  g_object_class_install_property (gobject_class, PROP_FAMILY,
				   g_param_spec_enum ("family",
						      P_("Socket family"),
						      P_("The sockets address family"),
						      G_TYPE_SOCKET_FAMILY,
						      G_SOCKET_FAMILY_INVALID,
						      G_PARAM_CONSTRUCT_ONLY |
                                                      G_PARAM_READWRITE |
                                                      G_PARAM_STATIC_STRINGS));

  g_object_class_install_property (gobject_class, PROP_TYPE,
				   g_param_spec_enum ("type",
						      P_("Socket type"),
						      P_("The sockets type"),
						      G_TYPE_SOCKET_TYPE,
						      G_SOCKET_TYPE_STREAM,
						      G_PARAM_CONSTRUCT_ONLY |
                                                      G_PARAM_READWRITE |
                                                      G_PARAM_STATIC_STRINGS));

  g_object_class_install_property (gobject_class, PROP_PROTOCOL,
				   g_param_spec_enum ("protocol",
						      P_("Socket protocol"),
						      P_("The id of the protocol to use, or -1 for unknown"),
						      G_TYPE_SOCKET_PROTOCOL,
						      G_SOCKET_PROTOCOL_UNKNOWN,
						      G_PARAM_CONSTRUCT_ONLY |
                                                      G_PARAM_READWRITE |
                                                      G_PARAM_STATIC_STRINGS));

  g_object_class_install_property (gobject_class, PROP_FD,
				   g_param_spec_int ("fd",
						     P_("File descriptor"),
						     P_("The sockets file descriptor"),
						     G_MININT,
						     G_MAXINT,
						     -1,
						     G_PARAM_CONSTRUCT_ONLY |
                                                     G_PARAM_READWRITE |
                                                     G_PARAM_STATIC_STRINGS));

  g_object_class_install_property (gobject_class, PROP_BLOCKING,
				   g_param_spec_boolean ("blocking",
							 P_("blocking"),
							 P_("Whether or not I/O on this socket is blocking"),
							 TRUE,
							 G_PARAM_READWRITE |
                                                         G_PARAM_STATIC_STRINGS));

  g_object_class_install_property (gobject_class, PROP_LISTEN_BACKLOG,
				   g_param_spec_int ("listen-backlog",
						     P_("Listen backlog"),
						     P_("Outstanding connections in the listen queue"),
						     0,
						     SOMAXCONN,
						     10,
						     G_PARAM_READWRITE |
                                                     G_PARAM_STATIC_STRINGS));

  g_object_class_install_property (gobject_class, PROP_KEEPALIVE,
				   g_param_spec_boolean ("keepalive",
							 P_("Keep connection alive"),
							 P_("Keep connection alive by sending periodic pings"),
							 FALSE,
							 G_PARAM_READWRITE |
                                                         G_PARAM_STATIC_STRINGS));

  g_object_class_install_property (gobject_class, PROP_LOCAL_ADDRESS,
				   g_param_spec_object ("local-address",
							P_("Local address"),
							P_("The local address the socket is bound to"),
							G_TYPE_SOCKET_ADDRESS,
							G_PARAM_READABLE |
                                                        G_PARAM_STATIC_STRINGS));

  g_object_class_install_property (gobject_class, PROP_REMOTE_ADDRESS,
				   g_param_spec_object ("remote-address",
							P_("Remote address"),
							P_("The remote address the socket is connected to"),
							G_TYPE_SOCKET_ADDRESS,
							G_PARAM_READABLE |
                                                        G_PARAM_STATIC_STRINGS));

  /**
   * GSocket:timeout:
   *
   * The timeout in seconds on socket I/O
   *
   * Since: 2.26
   */
  g_object_class_install_property (gobject_class, PROP_TIMEOUT,
				   g_param_spec_uint ("timeout",
						      P_("Timeout"),
						      P_("The timeout in seconds on socket I/O"),
						      0,
						      G_MAXUINT,
						      0,
						      G_PARAM_READWRITE |
						      G_PARAM_STATIC_STRINGS));

  /**
   * GSocket:broadcast:
   *
   * Whether the socket should allow sending to broadcast addresses.
   *
   * Since: 2.32
   */
  g_object_class_install_property (gobject_class, PROP_BROADCAST,
				   g_param_spec_boolean ("broadcast",
							 P_("Broadcast"),
							 P_("Whether to allow sending to broadcast addresses"),
							 FALSE,
							 G_PARAM_READWRITE |
                                                         G_PARAM_STATIC_STRINGS));

  /**
   * GSocket:ttl:
   *
   * Time-to-live for outgoing unicast packets
   *
   * Since: 2.32
   */
  g_object_class_install_property (gobject_class, PROP_TTL,
				   g_param_spec_uint ("ttl",
						      P_("TTL"),
						      P_("Time-to-live of outgoing unicast packets"),
						      0, G_MAXUINT, 0,
						      G_PARAM_READWRITE |
						      G_PARAM_STATIC_STRINGS));

  /**
   * GSocket:multicast-loopback:
   *
   * Whether outgoing multicast packets loop back to the local host.
   *
   * Since: 2.32
   */
  g_object_class_install_property (gobject_class, PROP_MULTICAST_LOOPBACK,
				   g_param_spec_boolean ("multicast-loopback",
							 P_("Multicast loopback"),
							 P_("Whether outgoing multicast packets loop back to the local host"),
							 TRUE,
							 G_PARAM_READWRITE |
                                                         G_PARAM_STATIC_STRINGS));

  /**
   * GSocket:multicast-ttl:
   *
   * Time-to-live out outgoing multicast packets
   *
   * Since: 2.32
   */
  g_object_class_install_property (gobject_class, PROP_MULTICAST_TTL,
				   g_param_spec_uint ("multicast-ttl",
						      P_("Multicast TTL"),
						      P_("Time-to-live of outgoing multicast packets"),
						      0, G_MAXUINT, 1,
						      G_PARAM_READWRITE |
						      G_PARAM_STATIC_STRINGS));
}

static void
g_socket_initable_iface_init (GInitableIface *iface)
{
  iface->init = g_socket_initable_init;
}

static void
g_socket_datagram_based_iface_init (GDatagramBasedInterface *iface)
{
  iface->receive_messages = g_socket_datagram_based_receive_messages;
  iface->send_messages = g_socket_datagram_based_send_messages;
  iface->create_source = g_socket_datagram_based_create_source;
  iface->condition_check = g_socket_datagram_based_condition_check;
  iface->condition_wait = g_socket_datagram_based_condition_wait;
}

static void
g_socket_init (GSocket *socket)
{
  socket->priv = g_socket_get_instance_private (socket);

  socket->priv->fd = -1;
  socket->priv->blocking = TRUE;
  socket->priv->listen_backlog = 10;
  socket->priv->construct_error = NULL;
#ifdef G_OS_WIN32
  socket->priv->event = WSA_INVALID_EVENT;
  g_mutex_init (&socket->priv->win32_source_lock);
  g_cond_init (&socket->priv->win32_source_cond);
#endif
}

static gboolean
g_socket_initable_init (GInitable *initable,
			GCancellable *cancellable,
			GError  **error)
{
  GSocket  *socket;

  g_return_val_if_fail (G_IS_SOCKET (initable), FALSE);

  socket = G_SOCKET (initable);

  if (cancellable != NULL)
    {
      g_set_error_literal (error, G_IO_ERROR, G_IO_ERROR_NOT_SUPPORTED,
                           _("Cancellable initialization not supported"));
      return FALSE;
    }

  socket->priv->inited = TRUE;

  if (socket->priv->construct_error)
    {
      if (error)
	*error = g_error_copy (socket->priv->construct_error);
      return FALSE;
    }


  return TRUE;
}

static gboolean
check_datagram_based (GDatagramBased  *self,
                      GError         **error)
{
  switch (g_socket_get_socket_type (G_SOCKET (self)))
    {
    case G_SOCKET_TYPE_INVALID:
    case G_SOCKET_TYPE_STREAM:
      g_set_error (error, G_IO_ERROR, G_IO_ERROR_NOT_SUPPORTED,
                   _("Cannot use datagram operations on a non-datagram "
                     "socket."));
      return FALSE;
    case G_SOCKET_TYPE_DATAGRAM:
    case G_SOCKET_TYPE_SEQPACKET:
      /* Fall through. */
      break;
    }

  /* Due to us sharing #GSocketSource with the #GSocket implementation, it is
   * pretty tricky to split out #GSocket:timeout so that it does not affect
   * #GDatagramBased operations (but still affects #GSocket operations). It is
   * not worth that effort — just disallow it and require the user to specify
   * timeouts on a per-operation basis. */
  if (g_socket_get_timeout (G_SOCKET (self)) != 0)
    {
      g_set_error (error, G_IO_ERROR, G_IO_ERROR_NOT_SUPPORTED,
                   _("Cannot use datagram operations on a socket with a "
                     "timeout set."));
      return FALSE;
    }

  return TRUE;
}

static gint
g_socket_datagram_based_receive_messages (GDatagramBased  *self,
                                          GInputMessage   *messages,
                                          guint            num_messages,
                                          gint             flags,
                                          gint64           timeout,
                                          GCancellable    *cancellable,
                                          GError         **error)
{
  if (!check_datagram_based (self, error))
    return FALSE;

  return g_socket_receive_messages_with_timeout (G_SOCKET (self), messages,
                                                 num_messages, flags, timeout,
                                                 cancellable, error);
}

static gint
g_socket_datagram_based_send_messages (GDatagramBased  *self,
                                       GOutputMessage  *messages,
                                       guint            num_messages,
                                       gint             flags,
                                       gint64           timeout,
                                       GCancellable    *cancellable,
                                       GError         **error)
{
  if (!check_datagram_based (self, error))
    return FALSE;

  return g_socket_send_messages_with_timeout (G_SOCKET (self), messages,
                                              num_messages, flags, timeout,
                                              cancellable, error);
}

static GSource *
g_socket_datagram_based_create_source (GDatagramBased  *self,
                                       GIOCondition     condition,
                                       GCancellable    *cancellable)
{
  if (!check_datagram_based (self, NULL))
    return NULL;

  return g_socket_create_source (G_SOCKET (self), condition, cancellable);
}

static GIOCondition
g_socket_datagram_based_condition_check (GDatagramBased  *datagram_based,
                                         GIOCondition     condition)
{
  if (!check_datagram_based (datagram_based, NULL))
    return G_IO_ERR;

  return g_socket_condition_check (G_SOCKET (datagram_based), condition);
}

static gboolean
g_socket_datagram_based_condition_wait (GDatagramBased  *datagram_based,
                                        GIOCondition     condition,
                                        gint64           timeout,
                                        GCancellable    *cancellable,
                                        GError         **error)
{
  if (!check_datagram_based (datagram_based, error))
    return FALSE;

  return g_socket_condition_timed_wait (G_SOCKET (datagram_based), condition,
                                        timeout, cancellable, error);
}

/**
 * g_socket_new:
 * @family: the socket family to use, e.g. %G_SOCKET_FAMILY_IPV4.
 * @type: the socket type to use.
 * @protocol: the id of the protocol to use, or 0 for default.
 * @error: #GError for error reporting, or %NULL to ignore.
 *
 * Creates a new #GSocket with the defined family, type and protocol.
 * If @protocol is 0 (%G_SOCKET_PROTOCOL_DEFAULT) the default protocol type
 * for the family and type is used.
 *
 * The @protocol is a family and type specific int that specifies what
 * kind of protocol to use. #GSocketProtocol lists several common ones.
 * Many families only support one protocol, and use 0 for this, others
 * support several and using 0 means to use the default protocol for
 * the family and type.
 *
 * The protocol id is passed directly to the operating
 * system, so you can use protocols not listed in #GSocketProtocol if you
 * know the protocol number used for it.
 *
 * Returns: a #GSocket or %NULL on error.
 *     Free the returned object with g_object_unref().
 *
 * Since: 2.22
 */
GSocket *
g_socket_new (GSocketFamily     family,
	      GSocketType       type,
	      GSocketProtocol   protocol,
	      GError          **error)
{
  return G_SOCKET (g_initable_new (G_TYPE_SOCKET,
				   NULL, error,
				   "family", family,
				   "type", type,
				   "protocol", protocol,
				   NULL));
}

/**
 * g_socket_new_from_fd:
 * @fd: a native socket file descriptor.
 * @error: #GError for error reporting, or %NULL to ignore.
 *
 * Creates a new #GSocket from a native file descriptor
 * or winsock SOCKET handle.
 *
 * This reads all the settings from the file descriptor so that
 * all properties should work. Note that the file descriptor
 * will be set to non-blocking mode, independent on the blocking
 * mode of the #GSocket.
 *
 * On success, the returned #GSocket takes ownership of @fd. On failure, the
 * caller must close @fd themselves.
 *
 * Since GLib 2.46, it is no longer a fatal error to call this on a non-socket
 * descriptor.  Instead, a GError will be set with code %G_IO_ERROR_FAILED
 *
 * Returns: a #GSocket or %NULL on error.
 *     Free the returned object with g_object_unref().
 *
 * Since: 2.22
 */
GSocket *
g_socket_new_from_fd (gint     fd,
		      GError **error)
{
  return G_SOCKET (g_initable_new (G_TYPE_SOCKET,
				   NULL, error,
				   "fd", fd,
				   NULL));
}

/**
 * g_socket_set_blocking:
 * @socket: a #GSocket.
 * @blocking: Whether to use blocking I/O or not.
 *
 * Sets the blocking mode of the socket. In blocking mode
 * all operations (which don’t take an explicit blocking parameter) block until
 * they succeed or there is an error. In
 * non-blocking mode all functions return results immediately or
 * with a %G_IO_ERROR_WOULD_BLOCK error.
 *
 * All sockets are created in blocking mode. However, note that the
 * platform level socket is always non-blocking, and blocking mode
 * is a GSocket level feature.
 *
 * Since: 2.22
 */
void
g_socket_set_blocking (GSocket  *socket,
		       gboolean  blocking)
{
  g_return_if_fail (G_IS_SOCKET (socket));

  blocking = !!blocking;

  if (socket->priv->blocking == blocking)
    return;

  socket->priv->blocking = blocking;
  g_object_notify (G_OBJECT (socket), "blocking");
}

/**
 * g_socket_get_blocking:
 * @socket: a #GSocket.
 *
 * Gets the blocking mode of the socket. For details on blocking I/O,
 * see g_socket_set_blocking().
 *
 * Returns: %TRUE if blocking I/O is used, %FALSE otherwise.
 *
 * Since: 2.22
 */
gboolean
g_socket_get_blocking (GSocket *socket)
{
  g_return_val_if_fail (G_IS_SOCKET (socket), FALSE);

  return socket->priv->blocking;
}

/**
 * g_socket_set_keepalive:
 * @socket: a #GSocket.
 * @keepalive: Value for the keepalive flag
 *
 * Sets or unsets the %SO_KEEPALIVE flag on the underlying socket. When
 * this flag is set on a socket, the system will attempt to verify that the
 * remote socket endpoint is still present if a sufficiently long period of
 * time passes with no data being exchanged. If the system is unable to
 * verify the presence of the remote endpoint, it will automatically close
 * the connection.
 *
 * This option is only functional on certain kinds of sockets. (Notably,
 * %G_SOCKET_PROTOCOL_TCP sockets.)
 *
 * The exact time between pings is system- and protocol-dependent, but will
 * normally be at least two hours. Most commonly, you would set this flag
 * on a server socket if you want to allow clients to remain idle for long
 * periods of time, but also want to ensure that connections are eventually
 * garbage-collected if clients crash or become unreachable.
 *
 * Since: 2.22
 */
void
g_socket_set_keepalive (GSocket  *socket,
			gboolean  keepalive)
{
  GError *error = NULL;

  g_return_if_fail (G_IS_SOCKET (socket));

  keepalive = !!keepalive;
  if (socket->priv->keepalive == keepalive)
    return;

  if (!g_socket_set_option (socket, SOL_SOCKET, SO_KEEPALIVE,
			    keepalive, &error))
    {
      g_warning ("error setting keepalive: %s", error->message);
      g_error_free (error);
      return;
    }

  socket->priv->keepalive = keepalive;
  g_object_notify (G_OBJECT (socket), "keepalive");
}

/**
 * g_socket_get_keepalive:
 * @socket: a #GSocket.
 *
 * Gets the keepalive mode of the socket. For details on this,
 * see g_socket_set_keepalive().
 *
 * Returns: %TRUE if keepalive is active, %FALSE otherwise.
 *
 * Since: 2.22
 */
gboolean
g_socket_get_keepalive (GSocket *socket)
{
  g_return_val_if_fail (G_IS_SOCKET (socket), FALSE);

  return socket->priv->keepalive;
}

/**
 * g_socket_get_listen_backlog:
 * @socket: a #GSocket.
 *
 * Gets the listen backlog setting of the socket. For details on this,
 * see g_socket_set_listen_backlog().
 *
 * Returns: the maximum number of pending connections.
 *
 * Since: 2.22
 */
gint
g_socket_get_listen_backlog  (GSocket *socket)
{
  g_return_val_if_fail (G_IS_SOCKET (socket), 0);

  return socket->priv->listen_backlog;
}

/**
 * g_socket_set_listen_backlog:
 * @socket: a #GSocket.
 * @backlog: the maximum number of pending connections.
 *
 * Sets the maximum number of outstanding connections allowed
 * when listening on this socket. If more clients than this are
 * connecting to the socket and the application is not handling them
 * on time then the new connections will be refused.
 *
 * Note that this must be called before g_socket_listen() and has no
 * effect if called after that.
 *
 * Since: 2.22
 */
void
g_socket_set_listen_backlog (GSocket *socket,
			     gint     backlog)
{
  g_return_if_fail (G_IS_SOCKET (socket));
  g_return_if_fail (!socket->priv->listening);

  if (backlog != socket->priv->listen_backlog)
    {
      socket->priv->listen_backlog = backlog;
      g_object_notify (G_OBJECT (socket), "listen-backlog");
    }
}

/**
 * g_socket_get_timeout:
 * @socket: a #GSocket.
 *
 * Gets the timeout setting of the socket. For details on this, see
 * g_socket_set_timeout().
 *
 * Returns: the timeout in seconds
 *
 * Since: 2.26
 */
guint
g_socket_get_timeout (GSocket *socket)
{
  g_return_val_if_fail (G_IS_SOCKET (socket), 0);

  return socket->priv->timeout;
}

/**
 * g_socket_set_timeout:
 * @socket: a #GSocket.
 * @timeout: the timeout for @socket, in seconds, or 0 for none
 *
 * Sets the time in seconds after which I/O operations on @socket will
 * time out if they have not yet completed.
 *
 * On a blocking socket, this means that any blocking #GSocket
 * operation will time out after @timeout seconds of inactivity,
 * returning %G_IO_ERROR_TIMED_OUT.
 *
 * On a non-blocking socket, calls to g_socket_condition_wait() will
 * also fail with %G_IO_ERROR_TIMED_OUT after the given time. Sources
 * created with g_socket_create_source() will trigger after
 * @timeout seconds of inactivity, with the requested condition
 * set, at which point calling g_socket_receive(), g_socket_send(),
 * g_socket_check_connect_result(), etc, will fail with
 * %G_IO_ERROR_TIMED_OUT.
 *
 * If @timeout is 0 (the default), operations will never time out
 * on their own.
 *
 * Note that if an I/O operation is interrupted by a signal, this may
 * cause the timeout to be reset.
 *
 * Since: 2.26
 */
void
g_socket_set_timeout (GSocket *socket,
		      guint    timeout)
{
  g_return_if_fail (G_IS_SOCKET (socket));

  if (timeout != socket->priv->timeout)
    {
      socket->priv->timeout = timeout;
      g_object_notify (G_OBJECT (socket), "timeout");
    }
}

/**
 * g_socket_get_ttl:
 * @socket: a #GSocket.
 *
 * Gets the unicast time-to-live setting on @socket; see
 * g_socket_set_ttl() for more details.
 *
 * Returns: the time-to-live setting on @socket
 *
 * Since: 2.32
 */
guint
g_socket_get_ttl (GSocket *socket)
{
  GError *error = NULL;
  gint value;

  g_return_val_if_fail (G_IS_SOCKET (socket), 0);

  if (socket->priv->family == G_SOCKET_FAMILY_IPV4)
    {
      g_socket_get_option (socket, IPPROTO_IP, IP_TTL,
			   &value, &error);
    }
  else if (socket->priv->family == G_SOCKET_FAMILY_IPV6)
    {
      g_socket_get_option (socket, IPPROTO_IPV6, IPV6_UNICAST_HOPS,
			   &value, &error);
    }
  else
    g_return_val_if_reached (0);

  if (error)
    {
      g_warning ("error getting unicast ttl: %s", error->message);
      g_error_free (error);
      return 0;
    }

  return value;
}

/**
 * g_socket_set_ttl:
 * @socket: a #GSocket.
 * @ttl: the time-to-live value for all unicast packets on @socket
 *
 * Sets the time-to-live for outgoing unicast packets on @socket.
 * By default the platform-specific default value is used.
 *
 * Since: 2.32
 */
void
g_socket_set_ttl (GSocket  *socket,
                  guint     ttl)
{
  GError *error = NULL;

  g_return_if_fail (G_IS_SOCKET (socket));

  if (socket->priv->family == G_SOCKET_FAMILY_IPV4)
    {
      g_socket_set_option (socket, IPPROTO_IP, IP_TTL,
			   ttl, &error);
    }
  else if (socket->priv->family == G_SOCKET_FAMILY_IPV6)
    {
      g_socket_set_option (socket, IPPROTO_IP, IP_TTL,
			   ttl, NULL);
      g_socket_set_option (socket, IPPROTO_IPV6, IPV6_UNICAST_HOPS,
			   ttl, &error);
    }
  else
    g_return_if_reached ();

  if (error)
    {
      g_warning ("error setting unicast ttl: %s", error->message);
      g_error_free (error);
      return;
    }

  g_object_notify (G_OBJECT (socket), "ttl");
}

/**
 * g_socket_get_broadcast:
 * @socket: a #GSocket.
 *
 * Gets the broadcast setting on @socket; if %TRUE,
 * it is possible to send packets to broadcast
 * addresses.
 *
 * Returns: the broadcast setting on @socket
 *
 * Since: 2.32
 */
gboolean
g_socket_get_broadcast (GSocket *socket)
{
  GError *error = NULL;
  gint value;

  g_return_val_if_fail (G_IS_SOCKET (socket), FALSE);

  if (!g_socket_get_option (socket, SOL_SOCKET, SO_BROADCAST,
			    &value, &error))
    {
      g_warning ("error getting broadcast: %s", error->message…

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