maint: update copyright

[gnulib.git] / lib / sleep.c

diff --git a/lib/sleep.c b/lib/sleep.c
index 037559b..2d86b7e 100644 (file)
--- a/lib/sleep.c
+++ b/lib/sleep.c
@@ -1,11 +1,11 @@
 /* Pausing execution of the current thread.
-   Copyright (C) 2007 Free Software Foundation, Inc.
+   Copyright (C) 2007, 2009-2014 Free Software Foundation, Inc.
    Written by Bruno Haible <bruno@clisp.org>, 2007.
 
-   This program is free software; you can redistribute it and/or modify
+   This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
-   the Free Software Foundation; either version 2, or (at your option)
-   any later version.
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
 
    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ -13,14 +13,17 @@
    GNU General Public License for more details.
 
    You should have received a copy of the GNU General Public License
-   along with this program; if not, write to the Free Software Foundation,
-   Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.  */
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
 
 #include <config.h>
 
 /* Specification.  */
 #include <unistd.h>
 
+#include <limits.h>
+
+#include "verify.h"
+
 #if (defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__
 
 # define WIN32_LEAN_AND_MEAN  /* avoid including junk */
@@ -32,7 +35,7 @@ sleep (unsigned int seconds)
   unsigned int remaining;
 
   /* Sleep for 1 second many times, because
-       1. Sleep is not interruptiple by Ctrl-C,
+       1. Sleep is not interruptible by Ctrl-C,
        2. we want to avoid arithmetic overflow while multiplying with 1000.  */
   for (remaining = seconds; remaining > 0; remaining--)
     Sleep (1000);
@@ -40,7 +43,33 @@ sleep (unsigned int seconds)
   return remaining;
 }
 
-#else
+#elif HAVE_SLEEP
+
+# undef sleep
+
+/* Guarantee unlimited sleep and a reasonable return value.  Cygwin
+   1.5.x rejects attempts to sleep more than 49.7 days (2**32
+   milliseconds), but uses uninitialized memory which results in a
+   garbage answer.  Similarly, Linux 2.6.9 with glibc 2.3.4 has a too
+   small return value when asked to sleep more than 24.85 days.  */
+unsigned int
+rpl_sleep (unsigned int seconds)
+{
+  /* This requires int larger than 16 bits.  */
+  verify (UINT_MAX / 24 / 24 / 60 / 60);
+  const unsigned int limit = 24 * 24 * 60 * 60;
+  while (limit < seconds)
+    {
+      unsigned int result;
+      seconds -= limit;
+      result = sleep (limit);
+      if (result)
+        return seconds + result;
+    }
+  return sleep (seconds);
+}
+
+#else /* !HAVE_SLEEP */
 
  #error "Please port gnulib sleep.c to your platform, possibly using usleep() or select(), then report this to bug-gnulib."