-# sleep.m4 serial 2
-dnl Copyright (C) 2007-2008 Free Software Foundation, Inc.
+# sleep.m4 serial 4
+dnl Copyright (C) 2007-2011 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
dnl with or without modifications, as long as this notice is preserved.
dnl it takes the number of milliseconds as argument and returns void.
dnl mingw does not declare this function.
AC_CHECK_DECLS([sleep], , , [#include <unistd.h>])
+ AC_CHECK_FUNCS_ONCE([sleep])
if test $ac_cv_have_decl_sleep != yes; then
HAVE_SLEEP=0
AC_LIBOBJ([sleep])
- gl_PREREQ_SLEEP
+ else
+ dnl Cygwin 1.5.x has a bug where sleep can't exceed 49.7 days.
+ AC_CACHE_CHECK([for working sleep], [gl_cv_func_sleep_works],
+ [AC_RUN_IFELSE([AC_LANG_PROGRAM([[
+#include <errno.h>
+#include <unistd.h>
+#include <signal.h>
+static void
+handle_alarm (int sig)
+{
+ if (sig != SIGALRM)
+ _exit (2);
+}
+]], [[
+ /* Failure to compile this test due to missing alarm is okay,
+ since all such platforms (mingw) also lack sleep. */
+ unsigned int pentecost = 50 * 24 * 60 * 60; /* 50 days. */
+ unsigned int remaining;
+ signal (SIGALRM, handle_alarm);
+ alarm (1);
+ remaining = sleep (pentecost);
+ if (remaining > pentecost)
+ return 3;
+ if (remaining <= pentecost - 10)
+ return 4;
+ return 0;
+ ]])],
+ [gl_cv_func_sleep_works=yes], [gl_cv_func_sleep_works=no],
+ [gl_cv_func_sleep_works="guessing no"])])
+ if test "$gl_cv_func_sleep_works" != yes; then
+ REPLACE_SLEEP=1
+ AC_LIBOBJ([sleep])
+ fi
fi
])
-
-# Prerequisites of lib/sleep.c.
-AC_DEFUN([gl_PREREQ_SLEEP], [:])