X-Git-Url: https://erislabs.net/gitweb/?a=blobdiff_plain;ds=sidebyside;f=m4%2Fnanosleep.m4;h=bfe8d574574ba3a7063bc0d03864e4bf8b580d44;hb=e059c2358aad79ce8dfd9581dd6f12ce8503dc63;hp=e4b634181be795e199c5e64b1e8475799407739e;hpb=c3a36c262d8af12176ebd5f10dc6f7ff9a743f97;p=gnulib.git

diff --git a/m4/nanosleep.m4 b/m4/nanosleep.m4
index e4b634181..bfe8d5745 100644
--- a/m4/nanosleep.m4
+++ b/m4/nanosleep.m4
@@ -1,15 +1,35 @@
-#serial 1
+#serial 9
 
 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,
+AC_DEFUN([jm_FUNC_NANOSLEEP],
 [
+ 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_CACHE_CHECK([whether nanosleep works],
   jm_cv_func_nanosleep_works,
-  [AC_TRY_RUN([
-#   include <time.h>
+  [
+   AC_REQUIRE([AC_HEADER_TIME])
+   AC_CHECK_HEADERS_ONCE(sys/time.h)
+   AC_TRY_RUN([
+#   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 +37,26 @@ 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);
+      exit (nanosleep (&ts_sleep, &ts_remaining) == 0 ? 0 : 1);
     }
 	  ],
 	 jm_cv_func_nanosleep_works=yes,
 	 jm_cv_func_nanosleep_works=no,
 	 dnl When crosscompiling, assume the worst.
-	 jm_cv_func_nanosleep_works=yes)
+	 jm_cv_func_nanosleep_works=no)
   ])
   if test $jm_cv_func_nanosleep_works = no; then
-    AC_SUBST(LIBOBJS)
-    LIBOBJS="$LIBOBJS nanosleep.$ac_objext"
-    AC_DEFINE_UNQUOTED(nanosleep, gnu_nanosleep,
-      [Define to gnu_nanosleep if the replacement function should be used.])
+    AC_LIBOBJ(nanosleep)
+    AC_DEFINE(nanosleep, rpl_nanosleep,
+      [Define to rpl_nanosleep if the replacement function should be used.])
+    gl_PREREQ_NANOSLEEP
   fi
+
+ LIBS=$nanosleep_save_libs
+])
+
+# Prerequisites of lib/nanosleep.c.
+AC_DEFUN([gl_PREREQ_NANOSLEEP],
+[
+  AC_CHECK_HEADERS_ONCE(unistd.h)
 ])