/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│ │vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│ ╞══════════════════════════════════════════════════════════════════════════════╡ │ Copyright 2020 Justine Alexandra Roberts Tunney │ │ │ │ Permission to use, copy, modify, and/or distribute this software for │ │ any purpose with or without fee is hereby granted, provided that the │ │ above copyright notice and this permission notice appear in all copies. │ │ │ │ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │ │ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │ │ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │ │ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │ │ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │ │ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │ │ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │ │ PERFORMANCE OF THIS SOFTWARE. │ ╚─────────────────────────────────────────────────────────────────────────────*/ #include "libc/calls/wait4.h" #include "libc/calls/calls.h" #include "libc/calls/cp.internal.h" #include "libc/calls/struct/rusage.internal.h" #include "libc/dce.h" #include "libc/intrin/asan.internal.h" #include "libc/intrin/strace.internal.h" #include "libc/sysv/errfuns.h" /** * Waits for status to change on process. * * @param pid >0 targets specific process, =0 means any proc in a group, * -1 means any child process, <-1 means any proc in specific group * @param opt_out_wstatus optionally returns status code, and *wstatus * may be inspected using WEEXITSTATUS(), etc. * @param options can have WNOHANG, WUNTRACED, WCONTINUED, etc. * @param opt_out_rusage optionally returns accounting data * @return process id of terminated child or -1 w/ errno * @cancellationpoint * @asyncsignalsafe * @restartable */ int wait4(int pid, int *opt_out_wstatus, int options, struct rusage *opt_out_rusage) { int rc, ws = 0; BEGIN_CANCELLATION_POINT; if (IsAsan() && ((opt_out_wstatus && !__asan_is_valid(opt_out_wstatus, sizeof(*opt_out_wstatus))) || (opt_out_rusage && !__asan_is_valid(opt_out_rusage, sizeof(*opt_out_rusage))))) { rc = efault(); } else if (!IsWindows()) { rc = sys_wait4(pid, &ws, options, opt_out_rusage); } else { rc = sys_wait4_nt(pid, &ws, options, opt_out_rusage); } if (rc != -1 && opt_out_wstatus) { *opt_out_wstatus = ws; } END_CANCELLATION_POINT; STRACE("wait4(%d, [%#x], %d, %p) → %d% m", pid, ws, options, opt_out_rusage, rc); return rc; }