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   1 # sys_socket_h.m4 serial 4
   2 dnl Copyright (C) 2005, 2006, 2007 Free Software Foundation, Inc.
   3 dnl This file is free software; the Free Software Foundation
   4 dnl gives unlimited permission to copy and/or distribute it,
   5 dnl with or without modifications, as long as this notice is preserved.
   6
   7 dnl From Simon Josefsson.
   8
   9 AC_DEFUN([gl_HEADER_SYS_SOCKET],
  10 [
  11   AC_CACHE_CHECK([whether <sys/socket.h> is self-contained],
  12     [gl_cv_header_sys_socket_h_selfcontained],
  13     [
  14       AC_COMPILE_IFELSE([AC_LANG_PROGRAM([#include <sys/socket.h>], [])],
  15         [gl_cv_header_sys_socket_h_selfcontained=yes],
  16         [gl_cv_header_sys_socket_h_selfcontained=no])
  17     ])
  18   if test $gl_cv_header_sys_socket_h_selfcontained = yes; then
  19     SYS_SOCKET_H=''
  20   else
  21     SYS_SOCKET_H='sys/socket.h'
  22
  23     gl_CHECK_NEXT_HEADERS([sys/socket.h])
  24     if test $ac_cv_header_sys_socket_h = yes; then
  25       HAVE_SYS_SOCKET_H=1
  26       HAVE_WINSOCK2_H=0
  27       HAVE_WS2TCPIP_H=0
  28     else
  29       HAVE_SYS_SOCKET_H=0
  30       dnl We cannot use AC_CHECK_HEADERS_ONCE here, because that would make
  31       dnl the check for those headers unconditional; yet cygwin reports
  32       dnl that the headers are present but cannot be compiled (since on
  33       dnl cygwin, all socket information should come from sys/socket.h).
  34       AC_CHECK_HEADERS([winsock2.h ws2tcpip.h])
  35       if test $ac_cv_header_winsock2_h = yes; then
  36         HAVE_WINSOCK2_H=1
  37       else
  38         HAVE_WINSOCK2_H=0
  39       fi
  40       if test $ac_cv_header_ws2tcpip_h = yes; then
  41         HAVE_WS2TCPIP_H=1
  42       else
  43         HAVE_WS2TCPIP_H=0
  44       fi
  45     fi
  46     AC_SUBST([HAVE_SYS_SOCKET_H])
  47     AC_SUBST([HAVE_WINSOCK2_H])
  48     AC_SUBST([HAVE_WS2TCPIP_H])
  49   fi
  50   AC_SUBST([SYS_SOCKET_H])
  51 ])