X-Git-Url: http://erislabs.net/gitweb/?a=blobdiff_plain;f=m4%2Fnanosleep.m4;h=88e630e8970ff20d35a4bd4187e89016a35855e4;hb=901bc47c9a8db854db97bb28780352748020c81d;hp=e4b634181be795e199c5e64b1e8475799407739e;hpb=c3a36c262d8af12176ebd5f10dc6f7ff9a743f97;p=gnulib.git

diff --git a/m4/nanosleep.m4 b/m4/nanosleep.m4
index e4b634181..88e630e89 100644
--- a/m4/nanosleep.m4
+++ b/m4/nanosleep.m4
@@ -1,15 +1,48 @@
-#serial 1
+#serial 18
 
 dnl From Jim Meyering.
-dnl FIXME
+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_CACHE_CHECK([whether nanosleep works],
-  jm_cv_func_nanosleep_works,
-  [AC_TRY_RUN([
-#   include <time.h>
+ 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=$LIBS
+
+ # Solaris 2.5.1 needs -lposix4 to get the nanosleep function.
+ # Solaris 7 prefers the library name -lrt to the obsolescent name -lposix4.
+ AC_SEARCH_LIBS([nanosleep], [rt posix4],
+                [test "$ac_cv_search_nanosleep" = "none required" ||
+	         LIB_NANOSLEEP=$ac_cv_search_nanosleep])
+ AC_SUBST([LIB_NANOSLEEP])
+
+ 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
 
     int
     main ()
@@ -17,18 +50,25 @@ 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 ? 1 : 0);
+      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=yes)
+      ]])],
+     [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, gnu_nanosleep,
-      [Define to gnu_nanosleep if the replacement function should be used.])
+  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)
 ])