lib/sockets.h

/* sockets.h - wrappers for Windows socket functions

   Copyright (C) 2008-2026 Free Software Foundation, Inc.

   This file 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 file 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 program.  If not, see <https://www.gnu.org/licenses/>.  */

/* Written by Simon Josefsson */

#ifndef SOCKETS_H
#define SOCKETS_H 1

/* This file uses _GL_ATTRIBUTE_CONST.  */
#if !_GL_CONFIG_H_INCLUDED
 #error "Please include config.h first."
#endif

#ifdef __cplusplus
extern "C" {
#endif

#define SOCKETS_1_0 0x0001
#define SOCKETS_1_1 0x0101
#define SOCKETS_2_0 0x0002
#define SOCKETS_2_1 0x0102
#define SOCKETS_2_2 0x0202

int gl_sockets_startup (int version)
#ifndef WINDOWS_SOCKETS
  _GL_ATTRIBUTE_CONST
#endif
  ;

int gl_sockets_cleanup (void)
#ifndef WINDOWS_SOCKETS
  _GL_ATTRIBUTE_CONST
#endif
  ;

#ifdef __cplusplus
}
#endif


/* This function is useful if you create a socket using gnulib's
   Winsock wrappers but needs to pass on the socket handle to some
   other library that only accepts sockets. */
#ifdef WINDOWS_SOCKETS

# include <sys/socket.h>

# if GNULIB_MSVC_NOTHROW
#  include "msvc-nothrow.h"
# else
#  include <io.h>
# endif

static inline SOCKET
gl_fd_to_handle (int fd)
{
  return _get_osfhandle (fd);
}

#else

# define gl_fd_to_handle(x) (x)

#endif /* WINDOWS_SOCKETS */

#endif /* SOCKETS_H */