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1 # sleep.m4 serial 3
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2 dnl Copyright (C) 2007-2010 Free Software Foundation, Inc.
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3 dnl This file is free software; the Free Software Foundation
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4 dnl gives unlimited permission to copy and/or distribute it,
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5 dnl with or without modifications, as long as this notice is preserved.
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6
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7 AC_DEFUN([gl_FUNC_SLEEP],
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8 [
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9 AC_REQUIRE([gl_UNISTD_H_DEFAULTS])
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10 dnl We expect to see the declaration of sleep() in a header file.
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11 dnl Older versions of mingw have a sleep() function that is an alias to
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12 dnl _sleep() in MSVCRT. It has a different signature than POSIX sleep():
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13 dnl it takes the number of milliseconds as argument and returns void.
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14 dnl mingw does not declare this function.
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15 AC_CHECK_DECLS([sleep], , , [#include <unistd.h>])
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16 AC_CHECK_FUNCS_ONCE([sleep])
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17 if test $ac_cv_have_decl_sleep != yes; then
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18 HAVE_SLEEP=0
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19 AC_LIBOBJ([sleep])
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20 else
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21 dnl Cygwin 1.5.x has a bug where sleep can't exceed 49.7 days.
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22 AC_CACHE_CHECK([for working sleep], [gl_cv_func_sleep_works],
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23 [AC_RUN_IFELSE([AC_LANG_PROGRAM([[
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24 #include <errno.h>
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25 #include <unistd.h>
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26 #include <signal.h>
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27 static void
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28 handle_alarm (int sig)
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29 {
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30 if (sig != SIGALRM)
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31 _exit (2);
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32 }
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33 ]], [[
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34 /* Failure to compile this test due to missing alarm is okay,
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35 since all such platforms (mingw) also lack sleep. */
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36 unsigned int pentecost = 50 * 24 * 60 * 60; /* 50 days. */
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37 unsigned int remaining;
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38 signal (SIGALRM, handle_alarm);
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39 alarm (1);
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40 remaining = sleep (pentecost);
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41 return !(pentecost - 10 < remaining && remaining <= pentecost);]])],
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42 [gl_cv_func_sleep_works=yes], [gl_cv_func_sleep_works=no],
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43 [gl_cv_func_sleep_works="guessing no"])])
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44 if test "$gl_cv_func_sleep_works" != yes; then
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45 REPLACE_SLEEP=1
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46 AC_LIBOBJ([sleep])
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47 fi
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48 fi
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49 ])
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