stpncpy: Fix C++ test error on mingw.

[gnulib.git] / m4 / nanosleep.m4

diff --git a/m4/nanosleep.m4 b/m4/nanosleep.m4
index d3c466d..a633321 100644 (file)
--- a/m4/nanosleep.m4
+++ b/m4/nanosleep.m4
@@ -1,61 +1,117 @@
-#serial 11
+# serial 30
 
 dnl From Jim Meyering.
 dnl Check for the nanosleep function.
 dnl If not found, use the supplied replacement.
 dnl
 
-# Copyright (C) 1999, 2000, 2001, 2003, 2004 Free Software Foundation, Inc.
+# Copyright (C) 1999-2001, 2003-2010 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],
 [
+ dnl Persuade glibc and Solaris <time.h> to declare nanosleep.
+ AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
+
+ AC_REQUIRE([gl_HEADER_TIME_H_DEFAULTS])
+ AC_CHECK_HEADERS_ONCE([sys/time.h])
+ AC_REQUIRE([gl_FUNC_SELECT])
+
  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.
+ LIB_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])
+                 LIB_NANOSLEEP=$ac_cv_search_nanosleep])
+
+ AC_REQUIRE([gl_MULTIARCH])
+ if test $APPLE_UNIVERSAL_BUILD = 1; then
+   # A universal build on Apple MacOS X platforms.
+   # The test result would be 'no (mishandles large arguments)' in 64-bit mode
+   # but 'yes' in 32-bit mode. But we need a configuration result that is
+   # valid in both modes.
+   gl_cv_func_nanosleep='no (mishandles large arguments)'
+ fi
 
- AC_CACHE_CHECK([whether nanosleep works],
-  jm_cv_func_nanosleep_works,
+ AC_CACHE_CHECK([for working nanosleep],
+  [gl_cv_func_nanosleep],
   [
-   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
+   AC_RUN_IFELSE(
+     [AC_LANG_SOURCE([[
+        #include <errno.h>
+        #include <limits.h>
+        #include <signal.h>
+        #if HAVE_SYS_TIME_H
+         #include <sys/time.h>
+        #endif
+        #include <time.h>
+        #include <unistd.h>
+        #define TYPE_SIGNED(t) (! ((t) 0 < (t) -1))
+        #define TYPE_MAXIMUM(t) \
+          ((t) (! TYPE_SIGNED (t) \
+                ? (t) -1 \
+                : ~ (~ (t) 0 << (sizeof (t) * CHAR_BIT - 1))))
+
+        static void
+        check_for_SIGALRM (int sig)
+        {
+          if (sig != SIGALRM)
+            _exit (1);
+        }
 
-    int
-    main ()
-    {
-      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);
-    }
-         ],
-        jm_cv_func_nanosleep_works=yes,
-        jm_cv_func_nanosleep_works=no,
-        dnl When crosscompiling, assume the worst.
-        jm_cv_func_nanosleep_works=no)
+        int
+        main ()
+        {
+          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);
+          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);
+          if (nanosleep (&ts_sleep, &ts_remaining) == -1 && errno == EINTR
+              && TYPE_MAXIMUM (time_t) - 10 < ts_remaining.tv_sec)
+            return 0;
+          return 119;
+        }]])],
+     [gl_cv_func_nanosleep=yes],
+     [case $? in dnl (
+      119) gl_cv_func_nanosleep='no (mishandles large arguments)';; dnl (
+      *)   gl_cv_func_nanosleep=no;;
+      esac],
+     [gl_cv_func_nanosleep=cross-compiling])
   ])
-  if test $jm_cv_func_nanosleep_works = no; then
-    AC_LIBOBJ(nanosleep)
-    AC_DEFINE(nanosleep, rpl_nanosleep,
-      [Define to rpl_nanosleep if the replacement function should be used.])
+  if test "$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 mishandles large arguments.])
+    else
+      for ac_lib in $LIBSOCKET; do
+        case " $LIB_NANOSLEEP " in
+        *" $ac_lib "*) ;;
+        *) LIB_NANOSLEEP="$LIB_NANOSLEEP $ac_lib";;
+        esac
+      done
+    fi
+    AC_LIBOBJ([nanosleep])
     gl_PREREQ_NANOSLEEP
   fi
 
@@ -65,5 +121,6 @@ AC_DEFUN([gl_FUNC_NANOSLEEP],
 # Prerequisites of lib/nanosleep.c.
 AC_DEFUN([gl_PREREQ_NANOSLEEP],
 [
-  AC_CHECK_HEADERS_ONCE(unistd.h)
+  AC_CHECK_HEADERS_ONCE([sys/select.h])
+  gl_PREREQ_SIG_HANDLER_H
 ])