1/*-
2 * Copyright (c) 2009 Ulf Lilleengen
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 *
26 * $FreeBSD: stable/11/lib/libutil/kinfo_getproc.c 312031 2017-01-13 08:39:23Z ngie $
27 */
28
29#include <sys/cdefs.h>
30__FBSDID("$FreeBSD: stable/11/lib/libutil/kinfo_getproc.c 312031 2017-01-13 08:39:23Z ngie $");
31
32#include <sys/param.h>
33#include <sys/sysctl.h>
34#include <sys/user.h>
35#include <stdlib.h>
36#include <string.h>
37
38#include "libutil.h"
39
40struct kinfo_proc *
41kinfo_getproc(pid_t pid)
42{
43	struct kinfo_proc *kipp;
44	int mib[4];
45	size_t len;
46
47	len = 0;
48	mib[0] = CTL_KERN;
49	mib[1] = KERN_PROC;
50	mib[2] = KERN_PROC_PID;
51	mib[3] = pid;
52	if (sysctl(mib, nitems(mib), NULL, &len, NULL, 0) < 0)
53		return (NULL);
54
55	kipp = malloc(len);
56	if (kipp == NULL)
57		return (NULL);
58
59	if (sysctl(mib, nitems(mib), kipp, &len, NULL, 0) < 0)
60		goto bad;
61	if (len != sizeof(*kipp))
62		goto bad;
63	if (kipp->ki_structsize != sizeof(*kipp))
64		goto bad;
65	if (kipp->ki_pid != pid)
66		goto bad;
67	return (kipp);
68bad:
69	free(kipp);
70	return (NULL);
71}
72