+#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 */