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# usleep.m4 serial 7
dnl Copyright (C) 2009-2021 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.
dnl This macro intentionally does not check for select or nanosleep;
dnl both of those modules can require external libraries.
AC_DEFUN([gl_FUNC_USLEEP],
[
AC_REQUIRE([gl_UNISTD_H_DEFAULTS])
dnl usleep was required in POSIX 2001, but dropped as obsolete in
dnl POSIX 2008; therefore, it is not always exposed in headers.
AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
AC_CHECK_FUNCS_ONCE([usleep])
AC_CHECK_TYPE([useconds_t], [],
[AC_DEFINE([useconds_t], [unsigned int], [Define to an unsigned 32-bit
type if <sys/types.h> lacks this type.])])
if test $ac_cv_func_usleep = no; then
HAVE_USLEEP=0
else
dnl POSIX allows implementations to reject arguments larger than
dnl 999999, but GNU guarantees it will work.
AC_CACHE_CHECK([whether usleep allows large arguments],
[gl_cv_func_usleep_works],
[AC_RUN_IFELSE([AC_LANG_PROGRAM([[
#include <unistd.h>
]], [[return !!usleep (1000000);]])],
[gl_cv_func_usleep_works=yes], [gl_cv_func_usleep_works=no],
[case "$host_os" in
# Guess yes on glibc systems.
*-gnu* | gnu*) gl_cv_func_usleep_works="guessing yes" ;;
# Guess yes on musl systems.
*-musl*) gl_cv_func_usleep_works="guessing yes" ;;
# Guess no on native Windows.
mingw*) gl_cv_func_usleep_works="guessing no" ;;
# If we don't know, obey --enable-cross-guesses.
*) gl_cv_func_usleep_works="$gl_cross_guess_normal" ;;
esac
])])
case "$gl_cv_func_usleep_works" in
*yes) ;;
*)
REPLACE_USLEEP=1
;;
esac
fi
])
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