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+/* Pausing execution of the current thread.
+ Copyright (C) 2007, 2009-2017 Free Software Foundation, Inc.
+ Written by Bruno Haible <bruno@clisp.org>, 2007.
+
+ 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 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
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ 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, see <https://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 */
+# include <windows.h>
+
+unsigned int
+sleep (unsigned int seconds)
+{
+ unsigned int remaining;
+
+ /* Sleep for 1 second many times, because
+ 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);
+
+ return remaining;
+}
+
+#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."
+
+#endif