mirror of
https://git.proxmox.com/git/grub2
synced 2025-10-31 08:25:14 +00:00
63 lines
2.0 KiB
Plaintext
63 lines
2.0 KiB
Plaintext
# sleep.m4 serial 7
|
|
dnl Copyright (C) 2007-2013 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.
|
|
|
|
AC_DEFUN([gl_FUNC_SLEEP],
|
|
[
|
|
AC_REQUIRE([gl_UNISTD_H_DEFAULTS])
|
|
AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
|
|
dnl We expect to see the declaration of sleep() in a header file.
|
|
dnl Older versions of mingw have a sleep() function that is an alias to
|
|
dnl _sleep() in MSVCRT. It has a different signature than POSIX sleep():
|
|
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 $ac_cv_have_decl_sleep != yes; then
|
|
HAVE_SLEEP=0
|
|
else
|
|
dnl Cygwin 1.5.x has a bug where sleep can't exceed 49.7 days.
|
|
AC_CACHE_CHECK([for working sleep], [gl_cv_func_sleep_works],
|
|
[AC_RUN_IFELSE([AC_LANG_PROGRAM([[
|
|
#include <errno.h>
|
|
#include <unistd.h>
|
|
#include <signal.h>
|
|
static void
|
|
handle_alarm (int sig)
|
|
{
|
|
if (sig != SIGALRM)
|
|
_exit (2);
|
|
}
|
|
]], [[
|
|
/* Failure to compile this test due to missing alarm is okay,
|
|
since all such platforms (mingw) also lack sleep. */
|
|
unsigned int pentecost = 50 * 24 * 60 * 60; /* 50 days. */
|
|
unsigned int remaining;
|
|
signal (SIGALRM, handle_alarm);
|
|
alarm (1);
|
|
remaining = sleep (pentecost);
|
|
if (remaining > pentecost)
|
|
return 3;
|
|
if (remaining <= pentecost - 10)
|
|
return 4;
|
|
return 0;
|
|
]])],
|
|
[gl_cv_func_sleep_works=yes], [gl_cv_func_sleep_works=no],
|
|
[case "$host_os" in
|
|
# Guess yes on glibc systems.
|
|
*-gnu*) gl_cv_func_sleep_works="guessing yes" ;;
|
|
# If we don't know, assume the worst.
|
|
*) gl_cv_func_sleep_works="guessing no" ;;
|
|
esac
|
|
])])
|
|
case "$gl_cv_func_sleep_works" in
|
|
*yes) ;;
|
|
*)
|
|
REPLACE_SLEEP=1
|
|
;;
|
|
esac
|
|
fi
|
|
])
|