* lib/stat-time.h: (get_stat_birthtime): Check for zero-valued

[gnulib.git] / m4 / nanosleep.m4

diff --git a/m4/nanosleep.m4 b/m4/nanosleep.m4
index 9741b15..a3a6814 100644 (file)
--- a/m4/nanosleep.m4
+++ b/m4/nanosleep.m4
@@ -1,12 +1,12 @@
-#serial 19
+#serial 22
 
 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, 2000, 2001, 2003, 2004, 2005, 2006, 2007 Free
+# Software Foundation, Inc.
 
 # This file is free software; the Free Software Foundation
 # gives unlimited permission to copy and/or distribute it,
@@ -17,7 +17,7 @@ AC_DEFUN([gl_FUNC_NANOSLEEP],
  dnl Persuade glibc and Solaris <time.h> to declare nanosleep.
  AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
 
- AC_REQUIRE([AC_HEADER_TIME])
+ AC_REQUIRE([gl_HEADER_TIME_H_DEFAULTS])
  AC_REQUIRE([gl_CLOCK_TIME])
  AC_CHECK_HEADERS_ONCE(sys/time.h)
 
@@ -34,19 +34,13 @@ AC_DEFUN([gl_FUNC_NANOSLEEP],
   [
    AC_RUN_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
        #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) \
@@ -67,9 +61,16 @@ AC_DEFUN([gl_FUNC_NANOSLEEP],
          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);
+         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);
@@ -85,7 +86,10 @@ AC_DEFUN([gl_FUNC_NANOSLEEP],
       esac],
      [gl_cv_func_nanosleep=cross-compiling])
   ])
-  if test "$gl_cv_func_nanosleep" != yes; then
+  if test "$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 mishandle large arguments.])
@@ -97,8 +101,6 @@ AC_DEFUN([gl_FUNC_NANOSLEEP],
       done
     fi
     AC_LIBOBJ(nanosleep)
-    AC_DEFINE(nanosleep, rpl_nanosleep,
-      [Define to rpl_nanosleep if the replacement function should be used.])
     gl_PREREQ_NANOSLEEP
   fi