projects / grub2.git / blame
| Commit | Line | Data |
|---|---|---|
| 4d8d554a CW |
1 | # sleep.m4 serial 7 |
| 2 | dnl Copyright (C) 2007-2013 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. | |
| 6 | ||
| 7 | AC_DEFUN([gl_FUNC_SLEEP], | |
| 8 | [ | |
| 9 | AC_REQUIRE([gl_UNISTD_H_DEFAULTS]) | |
| 10 | AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles | |
| 11 | dnl We expect to see the declaration of sleep() in a header file. | |
| 12 | dnl Older versions of mingw have a sleep() function that is an alias to | |
| 13 | dnl _sleep() in MSVCRT. It has a different signature than POSIX sleep(): | |
| 14 | dnl it takes the number of milliseconds as argument and returns void. | |
| 15 | dnl mingw does not declare this function. | |
| 16 | AC_CHECK_DECLS([sleep], , , [[#include <unistd.h>]]) | |
| 17 | AC_CHECK_FUNCS_ONCE([sleep]) | |
| 18 | if test $ac_cv_have_decl_sleep != yes; then | |
| 19 | HAVE_SLEEP=0 | |
| 20 | else | |
| 21 | dnl Cygwin 1.5.x has a bug where sleep can't exceed 49.7 days. | |
| 22 | AC_CACHE_CHECK([for working sleep], [gl_cv_func_sleep_works], | |
| 23 | [AC_RUN_IFELSE([AC_LANG_PROGRAM([[ | |
| 24 | #include <errno.h> | |
| 25 | #include <unistd.h> | |
| 26 | #include <signal.h> | |
| 27 | static void | |
| 28 | handle_alarm (int sig) | |
| 29 | { | |
| 30 | if (sig != SIGALRM) | |
| 31 | _exit (2); | |
| 32 | } | |
| 33 | ]], [[ | |
| 34 | /* Failure to compile this test due to missing alarm is okay, | |
| 35 | since all such platforms (mingw) also lack sleep. */ | |
| 36 | unsigned int pentecost = 50 * 24 * 60 * 60; /* 50 days. */ | |
| 37 | unsigned int remaining; | |
| 38 | signal (SIGALRM, handle_alarm); | |
| 39 | alarm (1); | |
| 40 | remaining = sleep (pentecost); | |
| 41 | if (remaining > pentecost) | |
| 42 | return 3; | |
| 43 | if (remaining <= pentecost - 10) | |
| 44 | return 4; | |
| 45 | return 0; | |
| 46 | ]])], | |
| 47 | [gl_cv_func_sleep_works=yes], [gl_cv_func_sleep_works=no], | |
| 48 | [case "$host_os" in | |
| 49 | # Guess yes on glibc systems. | |
| 50 | *-gnu*) gl_cv_func_sleep_works="guessing yes" ;; | |
| 51 | # If we don't know, assume the worst. | |
| 52 | *) gl_cv_func_sleep_works="guessing no" ;; | |
| 53 | esac | |
| 54 | ])]) | |
| 55 | case "$gl_cv_func_sleep_works" in | |
| 56 | *yes) ;; | |
| 57 | *) | |
| 58 | REPLACE_SLEEP=1 | |
| 59 | ;; | |
| 60 | esac | |
| 61 | fi | |
| 62 | ]) |