1/*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3 *
4 * Copyright (c) 2009 Ulf Lilleengen
5 * All rights reserved.
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 * $FreeBSD$
29 */
30
31#include <sys/cdefs.h>
32__FBSDID("$FreeBSD$");
33
34#include <sys/param.h>
35#include <sys/sysctl.h>
36#include <sys/user.h>
37#include <stdlib.h>
38#include <string.h>
39
40#include "libutil.h"
41
42struct kinfo_proc *
43kinfo_getproc(pid_t pid)
44{
45	struct kinfo_proc *kipp;
46	int mib[4];
47	size_t len;
48
49	len = 0;
50	mib[0] = CTL_KERN;
51	mib[1] = KERN_PROC;
52	mib[2] = KERN_PROC_PID;
53	mib[3] = pid;
54	if (sysctl(mib, nitems(mib), NULL, &len, NULL, 0) < 0)
55		return (NULL);
56
57	kipp = malloc(len);
58	if (kipp == NULL)
59		return (NULL);
60
61	if (sysctl(mib, nitems(mib), kipp, &len, NULL, 0) < 0)
62		goto bad;
63	if (len != sizeof(*kipp))
64		goto bad;
65	if (kipp->ki_structsize != sizeof(*kipp))
66		goto bad;
67	if (kipp->ki_pid != pid)
68		goto bad;
69	return (kipp);
70bad:
71	free(kipp);
72	return (NULL);
73}
74