-# sys_socket_h.m4 serial 4
-dnl Copyright (C) 2005, 2006, 2007 Free Software Foundation, Inc.
+# sys_socket_h.m4 serial 6
+dnl Copyright (C) 2005-2008 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.
AC_DEFUN([gl_HEADER_SYS_SOCKET],
[
+ AC_REQUIRE([AC_C_INLINE])
+
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>], [])],
+ 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=''
+ dnl If the shutdown function exists, <sys/socket.h> should define
+ dnl SHUT_RD, SHUT_WR, SHUT_RDWR.
+ AC_CHECK_FUNCS([shutdown])
+ if test $ac_cv_func_shutdown = yes; then
+ AC_CACHE_CHECK([whether <sys/socket.h> defines the SHUT_* macros],
+ [gl_cv_header_sys_socket_h_shut],
+ [
+ AC_COMPILE_IFELSE(
+ [AC_LANG_PROGRAM([[#include <sys/socket.h>]],
+ [[int a[] = { SHUT_RD, SHUT_WR, SHUT_RDWR };]])],
+ [gl_cv_header_sys_socket_h_shut=yes],
+ [gl_cv_header_sys_socket_h_shut=no])
+ ])
+ if test $gl_cv_header_sys_socket_h_shut = no; then
+ SYS_SOCKET_H='sys/socket.h'
+ fi
+ fi
else
SYS_SOCKET_H='sys/socket.h'
-
+ fi
+ if test -n "$SYS_SOCKET_H"; then
+ dnl Check prerequisites of the <sys/socket.h> replacement.
gl_CHECK_NEXT_HEADERS([sys/socket.h])
if test $ac_cv_header_sys_socket_h = yes; then
HAVE_SYS_SOCKET_H=1