mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-01-31 03:27:39 +00:00
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)
69 lines
3 KiB
C
69 lines
3 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 2021 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/assert.h"
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#include "libc/calls/calls.h"
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#include "libc/calls/struct/rusage.h"
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#include "libc/errno.h"
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#include "libc/stdio/stdio.h"
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#include "libc/sysv/errfuns.h"
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/**
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* Closes stream created by popen().
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*
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* This function may be interrupted or cancelled, however it won't
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* actually return until the child process has terminated. Thus we
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* always release the resource, and errors are purely advisory.
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*
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* @return termination status of subprocess, or -1 w/ ECHILD
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* @raise ECANCELED if thread was cancelled in masked mode
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* @raise ECHILD if child pid didn't exist
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* @raise EINTR if signal was delivered
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* @cancellationpoint
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*/
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int pclose(FILE *f) {
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int e, rc, ws, pid;
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bool iscancelled, wasinterrupted;
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pid = f->pid;
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fclose(f);
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if (!pid) return 0;
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iscancelled = false;
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wasinterrupted = false;
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for (e = errno;;) {
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if (wait4(pid, &ws, 0, 0) != -1) {
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rc = ws;
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break;
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} else if (errno == ECANCELED) {
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iscancelled = true;
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errno = e;
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} else if (errno == EINTR) {
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wasinterrupted = true;
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errno = e;
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} else {
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rc = echild();
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break;
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}
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}
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if (iscancelled) {
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return ecanceled();
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} else if (wasinterrupted) {
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return eintr();
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} else {
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return rc;
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}
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}
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