* 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 d25295e..a3a6814 100644 (file)
--- a/m4/nanosleep.m4
+++ b/m4/nanosleep.m4
@@ -1,4 +1,4 @@
-#serial 20
+#serial 22
 
 dnl From Jim Meyering.
 dnl Check for the nanosleep function.
@@ -17,6 +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([gl_HEADER_TIME_H_DEFAULTS])
  AC_REQUIRE([gl_CLOCK_TIME])
  AC_CHECK_HEADERS_ONCE(sys/time.h)
 
@@ -60,9 +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);
@@ -78,7 +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.])
@@ -90,8 +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