| 1 | # sleep.m4 serial 11
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| 2 | dnl Copyright (C) 2007-2021 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 | AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
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| 11 | dnl We expect to see the declaration of sleep() in a header file.
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| 12 | dnl Older versions of mingw have a sleep() function that is an alias to
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| 13 | dnl _sleep() in MSVCRT. It has a different signature than POSIX sleep():
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| 14 | dnl it takes the number of milliseconds as argument and returns void.
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| 15 | dnl mingw does not declare this function.
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| 16 | AC_CHECK_DECLS([sleep], , , [[#include <unistd.h>]])
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| 17 | AC_CHECK_FUNCS_ONCE([sleep])
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| 18 | if test $ac_cv_have_decl_sleep != yes; then
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| 19 | HAVE_SLEEP=0
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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 | if (remaining > pentecost)
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| 42 | return 3;
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| 43 | if (remaining <= pentecost - 10)
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| 44 | return 4;
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| 45 | return 0;
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| 46 | ]])],
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| 47 | [gl_cv_func_sleep_works=yes], [gl_cv_func_sleep_works=no],
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| 48 | [case "$host_os" in
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| 49 | # Guess yes on glibc systems.
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| 50 | *-gnu* | gnu*) gl_cv_func_sleep_works="guessing yes" ;;
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| 51 | # Guess yes on musl systems.
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| 52 | *-musl*) gl_cv_func_sleep_works="guessing yes" ;;
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| 53 | # Guess no on native Windows.
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| 54 | mingw*) gl_cv_func_sleep_works="guessing no" ;;
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| 55 | # If we don't know, obey --enable-cross-guesses.
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| 56 | *) gl_cv_func_sleep_works="$gl_cross_guess_normal" ;;
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| 57 | esac
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| 58 | ])])
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| 59 | case "$gl_cv_func_sleep_works" in
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| 60 | *yes) ;;
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| 61 | *)
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| 62 | REPLACE_SLEEP=1
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| 63 | ;;
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| 64 | esac
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| 65 | fi
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| 66 | ])
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