56 lines
1.8 KiB
C++
56 lines
1.8 KiB
C++
// -*- 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;
|
|
}
|
|
long __micro_sec = (__req->tv_nsec + 999) / 1000;
|
|
time_t __sec = __req->tv_sec;
|
|
if (__micro_sec > 999999) {
|
|
++__sec;
|
|
__micro_sec -= 1000000;
|
|
}
|
|
__sec = static_cast<time_t>(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(static_cast<unsigned int>(__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
|