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# sys_socket_h.m4 serial 4
dnl Copyright (C) 2005, 2006, 2007 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
dnl with or without modifications, as long as this notice is preserved.
dnl From Simon Josefsson.
AC_DEFUN([gl_HEADER_SYS_SOCKET],
[
AC_CACHE_CHECK([whether <sys/socket.h> is self-contained],
[gl_cv_header_sys_socket_h_selfcontained],
[
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([#include <sys/socket.h>], [])],
[gl_cv_header_sys_socket_h_selfcontained=yes],
[gl_cv_header_sys_socket_h_selfcontained=no])
])
if test $gl_cv_header_sys_socket_h_selfcontained = yes; then
SYS_SOCKET_H=''
else
SYS_SOCKET_H='sys/socket.h'
gl_CHECK_NEXT_HEADERS([sys/socket.h])
if test $ac_cv_header_sys_socket_h = yes; then
HAVE_SYS_SOCKET_H=1
HAVE_WINSOCK2_H=0
HAVE_WS2TCPIP_H=0
else
HAVE_SYS_SOCKET_H=0
dnl We cannot use AC_CHECK_HEADERS_ONCE here, because that would make
dnl the check for those headers unconditional; yet cygwin reports
dnl that the headers are present but cannot be compiled (since on
dnl cygwin, all socket information should come from sys/socket.h).
AC_CHECK_HEADERS([winsock2.h ws2tcpip.h])
if test $ac_cv_header_winsock2_h = yes; then
HAVE_WINSOCK2_H=1
else
HAVE_WINSOCK2_H=0
fi
if test $ac_cv_header_ws2tcpip_h = yes; then
HAVE_WS2TCPIP_H=1
else
HAVE_WS2TCPIP_H=0
fi
fi
AC_SUBST([HAVE_SYS_SOCKET_H])
AC_SUBST([HAVE_WINSOCK2_H])
AC_SUBST([HAVE_WS2TCPIP_H])
fi
AC_SUBST([SYS_SOCKET_H])
])
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