gio/gnetworking.c

   1 /* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */
   2
   3 /* GIO - GLib Input, Output and Streaming Library
   4  *
   5  * Copyright (C) 2011 Red Hat, Inc.
   6  *
   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.
  11  *
  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.
  16  *
  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.
  21  */
  22
  23 #include "config.h"
  24
  25 #include "gnetworking.h"
  26
  27 /**
  28  * SECTION:gnetworking
  29  * @title: gnetworking.h
  30  * @short_description: System networking includes
  31  * @include: gio/gnetworking.h
  32  *
  33  * The <literal>gnetworking.h</literal> header can be included to get
  34  * various low-level networking-related system headers, automatically
  35  * taking care of certain portability issues for you.
  36  *
  37  * This can be used, for example, if you want to call setsockopt()
  38  * on a #GSocket.
  39  *
  40  * Note that while WinSock has many of the same APIs as the
  41  * traditional UNIX socket API, most of them behave at least slightly
  42  * differently (particularly with respect to error handling). If you
  43  * want your code to work under both UNIX and Windows, you will need
  44  * to take these differences into account.
  45  *
  46  * Also, under glibc, certain non-portable functions are only visible
  47  * in the headers if you define <literal>_GNU_SOURCE</literal> before
  48  * including them. Note that this symbol must be defined before
  49  * including <emphasis>any</emphasis> headers, or it may not take
  50  * effect.
  51  */
  52
  53 /**
  54  * g_networking_init:
  55  *
  56  * Initializes the platform networking libraries (eg, on Windows, this
  57  * calls WSAStartup()). GLib will call this itself if it is needed, so
  58  * you only need to call it if you directly call system networking
  59  * functions (without calling any GLib networking functions first).
  60  *
  61  * Since: 2.36
  62  */
  63 void
  64 g_networking_init (void)
  65 {
  66 #ifdef G_OS_WIN32
  67   static volatile gsize inited = 0;
  68
  69   if (g_once_init_enter (&inited))
  70     {
  71       WSADATA wsadata;
  72
  73       if (WSAStartup (MAKEWORD (2, 0), &wsadata) != 0)
  74         g_error ("Windows Sockets could not be initialized");
  75
  76       g_once_init_leave (&inited, 1);
  77     }
  78 #endif
  79 }