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// -*- C++ -*-
//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#ifndef _LIBCPP_SUPPORT_IBM_NANOSLEEP_H
#define _LIBCPP_SUPPORT_IBM_NANOSLEEP_H
#include <unistd.h>
inline int nanosleep(const struct timespec* __req, struct timespec* __rem) {
// The nanosleep() function is not available on z/OS. Therefore, we will call
// sleep() to sleep for whole seconds and usleep() to sleep for any remaining
// fraction of a second. Any remaining nanoseconds will round up to the next
// microsecond.
if (__req->tv_sec < 0 || __req->tv_nsec < 0 || __req->tv_nsec > 999999999) {
errno = EINVAL;
return -1;
}
useconds_t __micro_sec =
static_cast<useconds_t>((__req->tv_nsec + 999) / 1000);
time_t __sec = __req->tv_sec;
if (__micro_sec > 999999) {
++__sec;
__micro_sec -= 1000000;
}
__sec = sleep(static_cast<unsigned int>(__sec));
if (__sec) {
if (__rem) {
// Updating the remaining time to sleep in case of unsuccessful call to sleep().
__rem->tv_sec = __sec;
__rem->tv_nsec = __micro_sec * 1000;
}
errno = EINTR;
return -1;
}
if (__micro_sec) {
int __rt = usleep(__micro_sec);
if (__rt != 0 && __rem) {
// The usleep() does not provide the amount of remaining time upon its failure,
// so the time slept will be ignored.
__rem->tv_sec = 0;
__rem->tv_nsec = __micro_sec * 1000;
// The errno is already set.
return -1;
}
return __rt;
}
return 0;
}
#endif // _LIBCPP_SUPPORT_IBM_NANOSLEEP_H
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