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+# sleep.m4 serial 8
+dnl Copyright (C) 2007-2017 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" ;;
+ # Guess no on native Windows.
+ mingw*) gl_cv_func_sleep_works="guessing no" ;;
+ # 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
+])