mirror of https://github.com/openssl/openssl.git
117 lines
3.1 KiB
C
117 lines
3.1 KiB
C
/*
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* Copyright 2022-2024 The OpenSSL Project Authors. All Rights Reserved.
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*
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* Licensed under the Apache License 2.0 (the "License"). You may not use
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* this file except in compliance with the License. You can obtain a copy
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* in the file LICENSE in the source distribution or at
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* https://www.openssl.org/source/license.html
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*/
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#include <openssl/crypto.h>
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#include "internal/e_os.h"
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/* system-specific variants defining OSSL_sleep() */
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#if defined(OPENSSL_SYS_UNIX) || defined(__DJGPP__)
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# if defined(OPENSSL_USE_USLEEP) \
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|| defined(__DJGPP__) \
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|| (defined(__TANDEM) && defined(_REENTRANT))
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/*
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* usleep() was made obsolete by POSIX.1-2008, and nanosleep()
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* should be used instead. However, nanosleep() isn't implemented
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* on the platforms given above, so we still use it for those.
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* Also, OPENSSL_USE_USLEEP can be defined to enable the use of
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* usleep, if it turns out that nanosleep() is unavailable.
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*/
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# include <unistd.h>
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void OSSL_sleep(uint64_t millis)
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{
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unsigned int s = (unsigned int)(millis / 1000);
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unsigned int us = (unsigned int)((millis % 1000) * 1000);
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if (s > 0)
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sleep(s);
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/*
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* On NonStop with the PUT thread model, thread context switch is
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* cooperative, with usleep() being a "natural" context switch point.
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* We avoid checking us > 0 here, to allow that context switch to
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* happen.
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*/
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usleep(us);
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}
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# elif defined(__TANDEM) && !defined(_REENTRANT)
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# include <cextdecs.h(PROCESS_DELAY_)>
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void OSSL_sleep(uint64_t millis)
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{
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/* HPNS does not support usleep for non threaded apps */
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PROCESS_DELAY_(millis * 1000);
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}
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# else
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/* nanosleep is defined by POSIX.1-2001 */
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# include <time.h>
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void OSSL_sleep(uint64_t millis)
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{
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struct timespec ts;
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ts.tv_sec = (long int) (millis / 1000);
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ts.tv_nsec = (long int) (millis % 1000) * 1000000ul;
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nanosleep(&ts, NULL);
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}
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# endif
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#elif defined(_WIN32) && !defined(OPENSSL_SYS_UEFI)
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# include <windows.h>
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void OSSL_sleep(uint64_t millis)
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{
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/*
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* Windows' Sleep() takes a DWORD argument, which is smaller than
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* a uint64_t, so we need to limit it to 49 days, which should be enough.
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*/
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DWORD limited_millis = (DWORD)-1;
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if (millis < limited_millis)
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limited_millis = (DWORD)millis;
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Sleep(limited_millis);
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}
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#else
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/* Fallback to a busy wait */
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# include "internal/time.h"
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static void ossl_sleep_secs(uint64_t secs)
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{
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/*
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* sleep() takes an unsigned int argument, which is smaller than
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* a uint64_t, so it needs to be limited to 136 years which
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* should be enough even for Sleeping Beauty.
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*/
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unsigned int limited_secs = UINT_MAX;
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if (secs < limited_secs)
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limited_secs = (unsigned int)secs;
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sleep(limited_secs);
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}
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static void ossl_sleep_millis(uint64_t millis)
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{
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const OSSL_TIME finish
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= ossl_time_add(ossl_time_now(), ossl_ms2time(millis));
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while (ossl_time_compare(ossl_time_now(), finish) < 0)
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/* busy wait */ ;
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}
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void OSSL_sleep(uint64_t millis)
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{
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ossl_sleep_secs(millis / 1000);
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ossl_sleep_millis(millis % 1000);
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}
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#endif /* defined(OPENSSL_SYS_UNIX) || defined(__DJGPP__) */
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