1/*-
2 * Copyright (c) 2012 Jukka A. Ukkonen
3 * All rights reserved.
4 *
5 * This software was developed by Jukka Ukkonen for FreeBSD.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29#include <sys/cdefs.h>
30__FBSDID("$FreeBSD: releng/10.3/lib/libc/gen/waitid.c 281981 2015-04-25 08:14:08Z kib $");
31
32#include "namespace.h"
33#include <sys/types.h>
34#include <sys/wait.h>
35#include <stddef.h>
36#include <string.h>
37#include <signal.h>
38#include <errno.h>
39#include "un-namespace.h"
40#include "libc_private.h"
41
42int
43__waitid(idtype_t idtype, id_t id, siginfo_t *info, int flags)
44{
45	int status;
46	pid_t ret;
47
48	ret = ((pid_t (*)(idtype_t, id_t, int *, int, struct __wrusage *,
49	    siginfo_t *))__libc_interposing[INTERPOS_wait6])(idtype, id,
50	    &status, flags, NULL, info);
51
52	/*
53	 * According to SUSv4, waitid() shall not return a PID when a
54	 * process is found, but only 0.  If a process was actually
55	 * found, siginfo_t fields si_signo and si_pid will be
56	 * non-zero.  In case WNOHANG was set in the flags and no
57	 * process was found those fields are set to zero using
58	 * memset() below.
59	 */
60	if (ret == 0 && info != NULL)
61		memset(info, 0, sizeof(*info));
62	else if (ret > 0)
63		ret = 0;
64	return (ret);
65}
66
67__weak_reference(__waitid, waitid);
68__weak_reference(__waitid, _waitid);
69