-#serial 18
+# serial 36
dnl From Jim Meyering.
dnl Check for the nanosleep function.
dnl If not found, use the supplied replacement.
dnl
-# Copyright (C) 1999, 2000, 2001, 2003, 2004, 2005, 2006 Free Software
-# Foundation, Inc.
+# Copyright (C) 1999-2001, 2003-2013 Free Software Foundation, Inc.
# This file is free software; the Free Software Foundation
# gives unlimited permission to copy and/or distribute it,
AC_DEFUN([gl_FUNC_NANOSLEEP],
[
+ AC_REQUIRE([gl_HEADER_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_REQUIRE([AC_HEADER_TIME])
- AC_CHECK_HEADERS_ONCE(sys/time.h)
+ AC_CHECK_HEADERS_ONCE([sys/time.h])
+ AC_REQUIRE([gl_FUNC_SELECT])
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=$ac_cv_search_nanosleep])
- AC_SUBST([LIB_NANOSLEEP])
+ LIB_NANOSLEEP=$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 nanosleep],
- [gl_cv_func_nanosleep],
- [
- AC_LINK_IFELSE([AC_LANG_SOURCE([[
-# if TIME_WITH_SYS_TIME
-# include <sys/time.h>
-# include <time.h>
-# else
-# if HAVE_SYS_TIME_H
-# include <sys/time.h>
-# else
-# include <time.h>
-# endif
-# endif
+ 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)))
- int
- main ()
- {
- struct timespec ts_sleep, ts_remaining;
- ts_sleep.tv_sec = 0;
- ts_sleep.tv_nsec = 1;
- return nanosleep (&ts_sleep, &ts_remaining) < 0;
- }
- ]])],
- [gl_cv_func_nanosleep=yes],
- [gl_cv_func_nanosleep=no])
- ])
- if test $gl_cv_func_nanosleep = no; then
- AC_LIBOBJ(nanosleep)
- AC_DEFINE(nanosleep, rpl_nanosleep,
- [Define to rpl_nanosleep if the replacement function should be used.])
- gl_PREREQ_NANOSLEEP
- fi
+ 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;
+ /* Test for major problems first. */
+ if (! nanosleep)
+ return 2;
+ 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 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;
+ 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)' ;;
+ *) # If we don't know, assume the worst.
+ gl_cv_func_nanosleep='guessing no' ;;
+ 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_FUNCS_ONCE(siginterrupt)
- AC_CHECK_HEADERS_ONCE(sys/select.h)
+ AC_CHECK_HEADERS_ONCE([sys/select.h])
+ gl_PREREQ_SIG_HANDLER_H
])
projects / gnulib.git / blobdiff