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# serial 28
dnl From Jim Meyering.
dnl Check for the nanosleep function.
dnl If not found, use the supplied replacement.
dnl
# Copyright (C) 1999-2001, 2003-2009 Free Software Foundation, Inc.
# This file is free software; the Free Software Foundation
# gives unlimited permission to copy and/or distribute it,
# with or without modifications, as long as this notice is preserved.
AC_DEFUN([gl_FUNC_NANOSLEEP],
[
dnl Persuade glibc and Solaris <time.h> to declare nanosleep.
AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
AC_REQUIRE([gl_HEADER_TIME_H_DEFAULTS])
AC_REQUIRE([gl_CLOCK_TIME])
AC_CHECK_HEADERS_ONCE([sys/time.h])
nanosleep_save_libs=$LIBS
# Solaris 2.5.1 needs -lposix4 to get the nanosleep function.
# Solaris 7 prefers the library name -lrt to the obsolescent name -lposix4.
LIB_NANOSLEEP=
AC_SUBST([LIB_NANOSLEEP])
AC_SEARCH_LIBS([nanosleep], [rt posix4],
[test "$ac_cv_search_nanosleep" = "none required" ||
LIB_NANOSLEEP=$ac_cv_search_nanosleep])
AC_REQUIRE([gl_MULTIARCH])
if test $APPLE_UNIVERSAL_BUILD = 1; then
# A universal build on Apple MacOS X platforms.
# The test result would be 'no (mishandles large arguments)' in 64-bit mode
# but 'yes' in 32-bit mode. But we need a configuration result that is
# valid in both modes.
gl_cv_func_nanosleep='no (mishandles large arguments)'
fi
AC_CACHE_CHECK([for working nanosleep],
[gl_cv_func_nanosleep],
[
AC_RUN_IFELSE(
[AC_LANG_SOURCE([[
#include <errno.h>
#include <limits.h>
#include <signal.h>
#if HAVE_SYS_TIME_H
#include <sys/time.h>
#endif
#include <time.h>
#include <unistd.h>
#define TYPE_SIGNED(t) (! ((t) 0 < (t) -1))
#define TYPE_MAXIMUM(t) \
((t) (! TYPE_SIGNED (t) \
? (t) -1 \
: ~ (~ (t) 0 << (sizeof (t) * CHAR_BIT - 1))))
static void
check_for_SIGALRM (int sig)
{
if (sig != SIGALRM)
_exit (1);
}
int
main ()
{
static struct timespec ts_sleep;
static struct timespec ts_remaining;
static struct sigaction act;
if (! nanosleep)
return 1;
act.sa_handler = check_for_SIGALRM;
sigemptyset (&act.sa_mask);
sigaction (SIGALRM, &act, NULL);
ts_sleep.tv_sec = 0;
ts_sleep.tv_nsec = 1;
alarm (1);
if (nanosleep (&ts_sleep, NULL) != 0)
return 1;
ts_sleep.tv_sec = TYPE_MAXIMUM (time_t);
ts_sleep.tv_nsec = 999999999;
alarm (1);
if (nanosleep (&ts_sleep, &ts_remaining) == -1 && errno == EINTR
&& TYPE_MAXIMUM (time_t) - 10 < ts_remaining.tv_sec)
return 0;
return 119;
}]])],
[gl_cv_func_nanosleep=yes],
[case $? in dnl (
119) gl_cv_func_nanosleep='no (mishandles large arguments)';; dnl (
*) gl_cv_func_nanosleep=no;;
esac],
[gl_cv_func_nanosleep=cross-compiling])
])
if test "$gl_cv_func_nanosleep" = yes; then
REPLACE_NANOSLEEP=0
else
REPLACE_NANOSLEEP=1
if test "$gl_cv_func_nanosleep" = 'no (mishandles large arguments)'; then
AC_DEFINE([HAVE_BUG_BIG_NANOSLEEP], [1],
[Define to 1 if nanosleep mishandles large arguments.])
for ac_lib in $LIB_CLOCK_GETTIME; do
case " $LIB_NANOSLEEP " in
*" $ac_lib "*) ;;
*) LIB_NANOSLEEP="$LIB_NANOSLEEP $ac_lib";;
esac
done
fi
AC_LIBOBJ([nanosleep])
gl_PREREQ_NANOSLEEP
fi
LIBS=$nanosleep_save_libs
])
# Prerequisites of lib/nanosleep.c.
AC_DEFUN([gl_PREREQ_NANOSLEEP],
[
AC_CHECK_HEADERS_ONCE([sys/select.h])
gl_PREREQ_SIG_HANDLER_H
])
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