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# select.m4 serial 6
dnl Copyright (C) 2009-2012 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_FUNC_SELECT],
[
AC_REQUIRE([gl_HEADER_SYS_SELECT])
AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
AC_REQUIRE([gl_SOCKETS])
if test "$ac_cv_header_winsock2_h" = yes; then
REPLACE_SELECT=1
else
dnl On Interix 3.5, select(0, NULL, NULL, NULL, timeout) fails with error
dnl EFAULT.
AC_CHECK_HEADERS_ONCE([sys/select.h])
AC_CACHE_CHECK([whether select supports a 0 argument],
[gl_cv_func_select_supports0],
[
AC_RUN_IFELSE([AC_LANG_SOURCE([[
#include <sys/types.h>
#include <sys/time.h>
#if HAVE_SYS_SELECT_H
#include <sys/select.h>
#endif
int main ()
{
struct timeval timeout;
timeout.tv_sec = 0;
timeout.tv_usec = 5;
return select (0, (fd_set *)0, (fd_set *)0, (fd_set *)0, &timeout) < 0;
}]])], [gl_cv_func_select_supports0=yes], [gl_cv_func_select_supports0=no],
[
changequote(,)dnl
case "$host_os" in
# Guess no on Interix.
interix*) gl_cv_func_select_supports0="guessing no";;
# Guess yes otherwise.
*) gl_cv_func_select_supports0="guessing yes";;
esac
changequote([,])dnl
])
])
case "$gl_cv_func_select_supports0" in
*yes) ;;
*) REPLACE_SELECT=1 ;;
esac
fi
dnl Determine the needed libraries.
LIB_SELECT="$LIBSOCKET"
if test $REPLACE_SELECT = 1; then
case "$host_os" in
mingw*)
dnl On the MSVC platform, the function MsgWaitForMultipleObjects
dnl (used in lib/select.c) requires linking with -luser32. On mingw,
dnl it is implicit.
AC_LINK_IFELSE(
[AC_LANG_SOURCE([[
#define WIN32_LEAN_AND_MEAN
#include <windows.h>
int
main ()
{
MsgWaitForMultipleObjects (0, NULL, 0, 0, 0);
return 0;
}]])],
[],
[LIB_SELECT="$LIB_SELECT -luser32"])
;;
esac
fi
AC_SUBST([LIB_SELECT])
])
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