X-Git-Url: http://erislabs.net/gitweb/?a=blobdiff_plain;f=m4%2Fnanosleep.m4;h=56c66bbb921d138397d455c8c3139fcacb40144c;hb=631efbd2473492048d7270009135eef32fdded30;hp=5ed4c472752034965978951f38b154bcef282228;hpb=1609bae901992a7ee9c36faa002cc7d8253bf5da;p=gnulib.git

diff --git a/m4/nanosleep.m4 b/m4/nanosleep.m4
index 5ed4c4727..56c66bbb9 100644
--- 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
 
-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.
- 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>
@@ -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;
-      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.])
+    gl_PREREQ_NANOSLEEP
   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)
+])