cosmopolitan/libc/calls/waitpid.c

43 lines
2.6 KiB
C

/*-*- 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 │
│ │
│ This program is free software; you can redistribute it and/or modify │
│ it under the terms of the GNU General Public License as published by │
│ the Free Software Foundation; version 2 of the License. │
│ │
│ This program is distributed in the hope that it will be useful, but │
│ WITHOUT ANY WARRANTY; without even the implied warranty of │
│ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU │
│ General Public License for more details. │
│ │
│ You should have received a copy of the GNU General Public License │
│ along with this program; if not, write to the Free Software │
│ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA │
│ 02110-1301 USA │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/calls/calls.h"
#include "libc/calls/internal.h"
#include "libc/calls/wait4.h"
#include "libc/dce.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 WEXITSTATUS(), etc.
* @param options can have WNOHANG, WUNTRACED, WCONTINUED, etc.
* @return process id of terminated child or -1 w/ errno
* @asyncsignalsafe
*/
int waitpid(int pid, int *opt_out_wstatus, int options) {
if (!IsWindows()) {
return wait4$sysv(pid, opt_out_wstatus, options, NULL);
} else {
return wait4$nt(pid, opt_out_wstatus, options, NULL);
}
}