xref: /freebsd/lib/libutil/kinfo_getproc.c (revision cfd6422a5217410fbd66f7a7a8a64d9d85e61229)
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 
42 struct kinfo_proc *
43 kinfo_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);
70 bad:
71 	free(kipp);
72 	return (NULL);
73 }
74