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# sys_select_h.m4 serial 8
dnl Copyright (C) 2006-2009 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_SELECT],
[
AC_REQUIRE([gl_HEADER_SYS_SOCKET])
AC_REQUIRE([gl_SYS_SELECT_H_DEFAULTS])
AC_CACHE_CHECK([whether <sys/select.h> is self-contained],
[gl_cv_header_sys_select_h_selfcontained],
[
dnl Test against two bugs:
dnl 1. On many platforms, <sys/select.h> assumes prior inclusion of
dnl <sys/types.h>.
dnl 2. On OSF/1 4.0, <sys/select.h> provides only a forward declaration
dnl of 'struct timeval', and no definition of this type.
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <sys/select.h>]],
[[struct timeval b;]])],
[gl_cv_header_sys_select_h_selfcontained=yes],
[gl_cv_header_sys_select_h_selfcontained=no])
dnl Test against another bug:
dnl 3. On Solaris 10, <sys/select.h> provides an FD_ZERO implementation
dnl that relies on memset(), but without including <string.h>.
if test $gl_cv_header_sys_select_h_selfcontained = yes; then
AC_COMPILE_IFELSE(
[AC_LANG_PROGRAM([[#include <sys/select.h>]],
[[int memset; int bzero;]])
],
[AC_LINK_IFELSE(
[AC_LANG_PROGRAM([[#include <sys/select.h>]], [[
#undef memset
#define memset nonexistent_memset
extern void *memset (void *, int, unsigned long);
#undef bzero
#define bzero nonexistent_bzero
extern void bzero (void *, unsigned long);
fd_set fds;
FD_ZERO (&fds);
]])
],
[],
[gl_cv_header_sys_select_h_selfcontained=no])
])
fi
])
if test $gl_cv_header_sys_select_h_selfcontained = yes; then
SYS_SELECT_H=''
else
SYS_SELECT_H='sys/select.h'
gl_CHECK_NEXT_HEADERS([sys/select.h])
if test $ac_cv_header_sys_select_h = yes; then
HAVE_SYS_SELECT_H=1
else
HAVE_SYS_SELECT_H=0
fi
AC_SUBST([HAVE_SYS_SELECT_H])
gl_PREREQ_SYS_H_WINSOCK2
fi
AC_SUBST([SYS_SELECT_H])
])
AC_DEFUN([gl_SYS_SELECT_MODULE_INDICATOR],
[
dnl Use AC_REQUIRE here, so that the default settings are expanded once only.
AC_REQUIRE([gl_SYS_SELECT_H_DEFAULTS])
GNULIB_[]m4_translit([$1],[abcdefghijklmnopqrstuvwxyz./-],[ABCDEFGHIJKLMNOPQRSTUVWXYZ___])=1
])
AC_DEFUN([gl_SYS_SELECT_H_DEFAULTS],
[
GNULIB_SELECT=0; AC_SUBST([GNULIB_SELECT])
dnl Assume proper GNU behavior unless another module says otherwise.
REPLACE_SELECT=0; AC_SUBST([REPLACE_SELECT])
])
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