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# serial 40
dnl From Jim Meyering.
dnl Check for the nanosleep function.
dnl If not found, use the supplied replacement.
dnl
# Copyright (C) 1999-2001, 2003-2021 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],
[
AC_REQUIRE([gl_TIME_H_DEFAULTS])
AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
dnl Persuade glibc and Solaris <time.h> to declare nanosleep.
AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
AC_CHECK_HEADERS_ONCE([sys/time.h])
AC_REQUIRE([gl_FUNC_SELECT])
AC_CHECK_DECLS_ONCE([alarm])
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=$ac_cv_search_nanosleep])
if test "x$ac_cv_search_nanosleep" != xno; then
dnl The system has a nanosleep function.
AC_REQUIRE([gl_MULTIARCH])
if test $APPLE_UNIVERSAL_BUILD = 1; then
# A universal build on Apple Mac OS 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) 1 << (sizeof (t) * CHAR_BIT - 2)) - 1) * 2 + 1)))
#if HAVE_DECL_ALARM
static void
check_for_SIGALRM (int sig)
{
if (sig != SIGALRM)
_exit (1);
}
#endif
int
main ()
{
static struct timespec ts_sleep;
static struct timespec ts_remaining;
/* Test for major problems first. */
if (! nanosleep)
return 2;
ts_sleep.tv_sec = 0;
ts_sleep.tv_nsec = 1;
#if HAVE_DECL_ALARM
{
static struct sigaction act;
act.sa_handler = check_for_SIGALRM;
sigemptyset (&act.sa_mask);
sigaction (SIGALRM, &act, NULL);
alarm (1);
if (nanosleep (&ts_sleep, NULL) != 0)
return 3;
/* Test for a minor problem: the handling of large arguments. */
ts_sleep.tv_sec = TYPE_MAXIMUM (time_t);
ts_sleep.tv_nsec = 999999999;
alarm (1);
if (nanosleep (&ts_sleep, &ts_remaining) != -1)
return 4;
if (errno != EINTR)
return 5;
if (ts_remaining.tv_sec <= TYPE_MAXIMUM (time_t) - 10)
return 6;
}
#else /* A simpler test for native Windows. */
if (nanosleep (&ts_sleep, &ts_remaining) < 0)
return 3;
#endif
return 0;
}]])],
[gl_cv_func_nanosleep=yes],
[case $? in dnl (
4|5|6) gl_cv_func_nanosleep='no (mishandles large arguments)';; dnl (
*) gl_cv_func_nanosleep=no;;
esac],
[case "$host_os" in dnl ((
linux*) # Guess it halfway works when the kernel is Linux.
gl_cv_func_nanosleep='guessing no (mishandles large arguments)' ;;
mingw*) # Guess no on native Windows.
gl_cv_func_nanosleep='guessing no' ;;
*) # If we don't know, obey --enable-cross-guesses.
gl_cv_func_nanosleep="$gl_cross_guess_normal" ;;
esac
])
])
case "$gl_cv_func_nanosleep" in
*yes)
REPLACE_NANOSLEEP=0
;;
*)
REPLACE_NANOSLEEP=1
case "$gl_cv_func_nanosleep" in
*"mishandles large arguments"*)
AC_DEFINE([HAVE_BUG_BIG_NANOSLEEP], [1],
[Define to 1 if nanosleep mishandles large arguments.])
;;
*)
# The replacement uses select(). Add $LIBSOCKET to $LIB_NANOSLEEP.
for ac_lib in $LIBSOCKET; do
case " $LIB_NANOSLEEP " in
*" $ac_lib "*) ;;
*) LIB_NANOSLEEP="$LIB_NANOSLEEP $ac_lib";;
esac
done
;;
esac
;;
esac
else
HAVE_NANOSLEEP=0
fi
LIBS=$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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