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| 1 | // -*- C++ -*- |
|---|---|
| 2 | //===----------------------------------------------------------------------===// |
| 3 | // |
| 4 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| 5 | // See https://llvm.org/LICENSE.txt for license information. |
| 6 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| 7 | // |
| 8 | //===----------------------------------------------------------------------===// |
| 9 | |
| 10 | #ifndef _LIBCPP___SUPPORT_IBM_NANOSLEEP_H |
| 11 | #define _LIBCPP___SUPPORT_IBM_NANOSLEEP_H |
| 12 | |
| 13 | #include <unistd.h> |
| 14 | |
| 15 | inline int nanosleep(const struct timespec* __req, struct timespec* __rem) { |
| 16 | // The nanosleep() function is not available on z/OS. Therefore, we will call |
| 17 | // sleep() to sleep for whole seconds and usleep() to sleep for any remaining |
| 18 | // fraction of a second. Any remaining nanoseconds will round up to the next |
| 19 | // microsecond. |
| 20 | if (__req->tv_sec < 0 || __req->tv_nsec < 0 || __req->tv_nsec > 999999999) { |
| 21 | errno = EINVAL; |
| 22 | return -1; |
| 23 | } |
| 24 | long __micro_sec = (__req->tv_nsec + 999) / 1000; |
| 25 | time_t __sec = __req->tv_sec; |
| 26 | if (__micro_sec > 999999) { |
| 27 | ++__sec; |
| 28 | __micro_sec -= 1000000; |
| 29 | } |
| 30 | __sec = static_cast<time_t>(sleep(static_cast<unsigned int>(__sec))); |
| 31 | if (__sec) { |
| 32 | if (__rem) { |
| 33 | // Updating the remaining time to sleep in case of unsuccessful call to sleep(). |
| 34 | __rem->tv_sec = __sec; |
| 35 | __rem->tv_nsec = __micro_sec * 1000; |
| 36 | } |
| 37 | errno = EINTR; |
| 38 | return -1; |
| 39 | } |
| 40 | if (__micro_sec) { |
| 41 | int __rt = usleep(static_cast<unsigned int>(__micro_sec)); |
| 42 | if (__rt != 0 && __rem) { |
| 43 | // The usleep() does not provide the amount of remaining time upon its failure, |
| 44 | // so the time slept will be ignored. |
| 45 | __rem->tv_sec = 0; |
| 46 | __rem->tv_nsec = __micro_sec * 1000; |
| 47 | // The errno is already set. |
| 48 | return -1; |
| 49 | } |
| 50 | return __rt; |
| 51 | } |
| 52 | return 0; |
| 53 | } |
| 54 | |
| 55 | #endif // _LIBCPP___SUPPORT_IBM_NANOSLEEP_H |
| 56 |
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