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)
64 lines
3.3 KiB
C
64 lines
3.3 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 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/calls.h"
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#include "libc/calls/cp.internal.h"
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#include "libc/calls/struct/rusage.internal.h"
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#include "libc/calls/wait4.h"
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#include "libc/dce.h"
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#include "libc/intrin/asan.internal.h"
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#include "libc/intrin/strace.internal.h"
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#include "libc/sysv/errfuns.h"
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/**
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* Waits for status to change on process.
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*
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* @param pid >0 targets specific process, =0 means any proc in a group,
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* -1 means any child process, <-1 means any proc in specific group
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* @param opt_out_wstatus optionally returns status code, and *wstatus
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* may be inspected using WEEXITSTATUS(), etc.
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* @param options can have WNOHANG, WUNTRACED, WCONTINUED, etc.
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* @param opt_out_rusage optionally returns accounting data
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* @return process id of terminated child or -1 w/ errno
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* @cancellationpoint
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* @asyncsignalsafe
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* @restartable
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*/
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int wait4(int pid, int *opt_out_wstatus, int options,
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struct rusage *opt_out_rusage) {
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int rc, ws = 0;
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BEGIN_CANCELLATION_POINT;
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if (IsAsan() &&
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((opt_out_wstatus &&
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!__asan_is_valid(opt_out_wstatus, sizeof(*opt_out_wstatus))) ||
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(opt_out_rusage &&
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!__asan_is_valid(opt_out_rusage, sizeof(*opt_out_rusage))))) {
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rc = efault();
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} else if (!IsWindows()) {
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rc = sys_wait4(pid, &ws, options, opt_out_rusage);
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} else {
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rc = sys_wait4_nt(pid, &ws, options, opt_out_rusage);
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}
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if (rc != -1 && opt_out_wstatus) *opt_out_wstatus = ws;
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END_CANCELLATION_POINT;
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STRACE("wait4(%d, [%#x], %d, %p) → %d% m", pid, ws, options, opt_out_rusage,
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rc);
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return rc;
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}
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