/* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */

/* GIO - GLib Input, Output and Streaming Library

 *

 * Copyright (C) 2011 Red Hat, Inc.

 *

 * SPDX-License-Identifier: LGPL-2.1-or-later

 *

 * 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/>.

 */

#include "config.h"

#include "gnetworking.h"

#include "gnetworkingprivate.h"

/**

 * SECTION:gnetworking

 * @title: gnetworking.h

 * @short_description: System networking includes

 * @include: gio/gnetworking.h

 *

 * The `<gio/gnetworking.h>` header can be included to get

 * various low-level networking-related system headers, automatically

 * taking care of certain portability issues for you.

 *

 * This can be used, for example, if you want to call setsockopt()

 * on a #GSocket.

 *

 * Note that while WinSock has many of the same APIs as the

 * traditional UNIX socket API, most of them behave at least slightly

 * differently (particularly with respect to error handling). If you

 * want your code to work under both UNIX and Windows, you will need

 * to take these differences into account.

 *

 * Also, under GNU libc, certain non-portable functions are only visible

 * in the headers if you define %_GNU_SOURCE before including them. Note

 * that this symbol must be defined before including any headers, or it

 * may not take effect.

 */

/**

 * g_networking_init:

 *

 * Initializes the platform networking libraries (eg, on Windows, this

 * calls WSAStartup()). GLib will call this itself if it is needed, so

 * you only need to call it if you directly call system networking

 * functions (without calling any GLib networking functions first).

 *

 * Since: 2.36

 */

void

g_networking_init (void)

{

#ifdef G_OS_WIN32

  static gsize inited = 0;

  if (g_once_init_enter (&inited))

    {

      WSADATA wsadata;

      if (WSAStartup (MAKEWORD (2, 0), &wsadata) != 0)

        g_error ("Windows Sockets could not be initialized");

      g_once_init_leave (&inited, 1);

    }

#endif

}

gboolean

g_getservbyname_ntohs (const char *name, const char *proto, guint16 *out_port)

{

  struct servent *result;

#ifdef HAVE_GETSERVBYNAME_R

  struct servent result_buf;

  char buf[2048];

  int r;

  r = getservbyname_r (name, proto, &result_buf, buf, sizeof (buf), &result);

  if (r != 0 || result != &result_buf)

    result = NULL;

#else

  result = getservbyname (name, proto);

#endif

  if (!result)

    return FALSE;

  *out_port = g_ntohs (result->s_port);

  return TRUE;

}