2 dnl Copyright (C) 2007-2011 Free Software Foundation, Inc.
3 dnl This file is free software; the Free Software Foundation
4 dnl gives unlimited permission to copy and/or distribute it,
5 dnl with or without modifications, as long as this notice is preserved.
7 AC_DEFUN([gl_FUNC_SLEEP],
9 AC_REQUIRE([gl_UNISTD_H_DEFAULTS])
10 dnl We expect to see the declaration of sleep() in a header file.
11 dnl Older versions of mingw have a sleep() function that is an alias to
12 dnl _sleep() in MSVCRT. It has a different signature than POSIX sleep():
13 dnl it takes the number of milliseconds as argument and returns void.
14 dnl mingw does not declare this function.
15 AC_CHECK_DECLS([sleep], , , [#include <unistd.h>])
16 AC_CHECK_FUNCS_ONCE([sleep])
17 if test $ac_cv_have_decl_sleep != yes; then
20 dnl Cygwin 1.5.x has a bug where sleep can't exceed 49.7 days.
21 AC_CACHE_CHECK([for working sleep], [gl_cv_func_sleep_works],
22 [AC_RUN_IFELSE([AC_LANG_PROGRAM([[
27 handle_alarm (int sig)
33 /* Failure to compile this test due to missing alarm is okay,
34 since all such platforms (mingw) also lack sleep. */
35 unsigned int pentecost = 50 * 24 * 60 * 60; /* 50 days. */
36 unsigned int remaining;
37 signal (SIGALRM, handle_alarm);
39 remaining = sleep (pentecost);
40 if (remaining > pentecost)
42 if (remaining <= pentecost - 10)
46 [gl_cv_func_sleep_works=yes], [gl_cv_func_sleep_works=no],
47 [gl_cv_func_sleep_works="guessing no"])])
48 if test "$gl_cv_func_sleep_works" != yes; then