mirror of
https://github.com/jart/cosmopolitan.git
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853b6c3864
- Wrap clock_getres() - Wrap sched_setscheduler() - Make sleep() api conformant - Polyfill sleep() using select() - Improve clock_gettime() polyfill - Make nanosleep() POSIX conformant - Slightly improve some DNS functions - Further strengthen pledge() sandboxing - Improve rounding of timeval / timespec - Allow layering of pledge() calls on Linux - Polyfill sched_yield() using select() on XNU - Delete more system constants we probably don't need
45 lines
2.6 KiB
C
45 lines
2.6 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2022 Justine Alexandra Roberts Tunney │
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│ │
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│ Permission to use, copy, modify, and/or distribute this software for │
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│ any purpose with or without fee is hereby granted, provided that the │
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│ above copyright notice and this permission notice appear in all copies. │
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│ │
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│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
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│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
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│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
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│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
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│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
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│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
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│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
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│ PERFORMANCE OF THIS SOFTWARE. │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/calls/struct/timespec.h"
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#include "libc/dce.h"
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#include "libc/fmt/conv.h"
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// we don't want instrumentation because:
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// - nanosleep() depends on this and ftrace can take microsecs
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/**
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* Converts `struct timespec` to `struct timeval`.
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*
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* This divides ts.tv_nsec by 1000 with upward rounding and overflow
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* handling. Your ts.tv_nsec must be on the interval `[0,1000000000)`
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* otherwise `{-1, -1}` is returned.
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*
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* @return converted timeval whose tv_usec will be -1 on error
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*/
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noinstrument struct timeval _timespec2timeval(struct timespec ts) {
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if (0 <= ts.tv_nsec && ts.tv_nsec < 1000000000) {
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if (0 <= ts.tv_nsec && ts.tv_nsec < 1000000000 - 999) {
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return (struct timeval){ts.tv_sec, (ts.tv_nsec + 999) / 1000};
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} else {
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return (struct timeval){ts.tv_sec + 1, 0};
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}
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} else {
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return (struct timeval){-1, -1};
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}
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}
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