Sync from coreutils.

[gnulib.git] / m4 / nanosleep.m4

diff --git a/m4/nanosleep.m4 b/m4/nanosleep.m4
index 5ed4c47..56c66bb 100644 (file)
--- a/m4/nanosleep.m4
+++ b/m4/nanosleep.m4
@@ -1,24 +1,40 @@
-#serial 6
+#serial 17

 
 dnl From Jim Meyering.
 dnl Check for the nanosleep function.
 dnl If not found, use the supplied replacement.
 dnl
 
 
 dnl From Jim Meyering.
 dnl Check for the nanosleep function.
 dnl If not found, use the supplied replacement.
 dnl
 

-AC_DEFUN(jm_FUNC_NANOSLEEP,
+# Copyright (C) 1999, 2000, 2001, 2003, 2004, 2005, 2006 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_LIBSOURCES([nanosleep.c])
+
+ 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)
+

  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.
  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.

- AC_SEARCH_LIBS(nanosleep, [rt posix4], [LIB_NANOSLEEP=$ac_cv_search_nanosleep])
- AC_SUBST(LIB_NANOSLEEP)
+ AC_SEARCH_LIBS([nanosleep], [rt posix4],
+                [test "$ac_cv_search_nanosleep" = "none required" ||
+                LIB_NANOSLEEP=$ac_cv_search_nanosleep])
+ AC_SUBST([LIB_NANOSLEEP])

 
 

- AC_CACHE_CHECK([whether nanosleep works],
-  jm_cv_func_nanosleep_works,
+ AC_CACHE_CHECK([for nanosleep],
+  [gl_cv_func_nanosleep],

   [
   [

-   AC_REQUIRE([AC_HEADER_TIME])
-   AC_TRY_RUN([
+   AC_LINK_IFELSE([AC_LANG_SOURCE([[

 #   if TIME_WITH_SYS_TIME
 #    include <sys/time.h>
 #    include <time.h>
 #   if TIME_WITH_SYS_TIME
 #    include <sys/time.h>
 #    include <time.h>


@@ -36,20 +52,25 @@ AC_DEFUN(jm_FUNC_NANOSLEEP,
       struct timespec ts_sleep, ts_remaining;
       ts_sleep.tv_sec = 0;
       ts_sleep.tv_nsec = 1;
       struct timespec ts_sleep, ts_remaining;
       ts_sleep.tv_sec = 0;
       ts_sleep.tv_nsec = 1;

-      exit (nanosleep (&ts_sleep, &ts_remaining) == 0 ? 0 : 1);
+      return nanosleep (&ts_sleep, &ts_remaining) < 0;

     }
     }

-         ],
-        jm_cv_func_nanosleep_works=yes,
-        jm_cv_func_nanosleep_works=no,
-        dnl When crosscompiling, assume the worst.
-        jm_cv_func_nanosleep_works=no)
+      ]])],
+     [gl_cv_func_nanosleep=yes],
+     [gl_cv_func_nanosleep=no])

   ])
   ])

-  if test $jm_cv_func_nanosleep_works = no; then
-    AC_SUBST(LIBOBJS)
-    LIBOBJS="$LIBOBJS nanosleep.$ac_objext"
-    AC_DEFINE_UNQUOTED(nanosleep, rpl_nanosleep,
+  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.])
       [Define to rpl_nanosleep if the replacement function should be used.])

+    gl_PREREQ_NANOSLEEP

   fi
 
  LIBS=$nanosleep_save_libs
 ])
   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)
+])