mirror of
https://github.com/jart/cosmopolitan.git
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3f0bcdc3ef
- Exhaustively document cancellation points - Rename SIGCANCEL to SIGTHR just like BSDs - Further improve POSIX thread cancellations - Ensure asynchronous cancellations work correctly - Elevate the quality of getrandom() and getentropy() - Make futexes cancel correctly on OpenBSD 6.x and 7.x - Add reboot.com and shutdown.com to examples directory - Remove underscore prefix from awesome timespec_*() APIs - Create assertions that help verify our cancellation points - Remove bad timespec APIs (cmp generalizes eq/ne/gt/gte/lt/lte)
52 lines
2.8 KiB
C
52 lines
2.8 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 2020 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/calls/struct/timespec.internal.h"
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#include "libc/calls/struct/timeval.h"
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#include "libc/calls/struct/timeval.internal.h"
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#include "libc/errno.h"
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#include "libc/sock/internal.h"
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// nanosleep() on xnu: a bloodbath of a polyfill
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// consider using clock_nanosleep(TIMER_ABSTIME)
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int sys_nanosleep_xnu(const struct timespec *req, struct timespec *rem) {
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int rc;
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struct timeval wt, t1, t2, td;
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if (rem) sys_gettimeofday_xnu(&t1, 0, 0);
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wt = timespec_totimeval(*req); // rounds up
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rc = sys_select(0, 0, 0, 0, &wt);
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if (rem) {
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if (!rc) {
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rem->tv_sec = 0;
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rem->tv_nsec = 0;
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} else if (rc == -1 && errno == EINTR) {
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// xnu select() doesn't modify timeout
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// so we need, yet another system call
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sys_gettimeofday_xnu(&t2, 0, 0);
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td = timeval_sub(t2, t1);
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if (timeval_cmp(td, wt) >= 0) {
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rem->tv_sec = 0;
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rem->tv_nsec = 0;
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} else {
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*rem = timeval_totimespec(timeval_sub(wt, td));
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}
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}
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}
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return rc;
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}
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