renice.c revision 78718 
1/*
2 * Copyright (c) 1983, 1989, 1993
3 *	The Regents of the University of California.  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 * 3. All advertising materials mentioning features or use of this software
14 *    must display the following acknowledgement:
15 *	This product includes software developed by the University of
16 *	California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 *    may be used to endorse or promote products derived from this software
19 *    without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34#ifndef lint
35static const char copyright[] =
36"@(#) Copyright (c) 1983, 1989, 1993\n\
37	The Regents of the University of California.  All rights reserved.\n";
38#endif /* not lint */
39
40#ifndef lint
41#if 0
42static char sccsid[] = "@(#)renice.c	8.1 (Berkeley) 6/9/93";
43#endif
44static const char rcsid[] =
45  "$FreeBSD: head/usr.bin/renice/renice.c 78718 2001-06-24 19:50:42Z dd $";
46#endif /* not lint */
47
48#include <sys/types.h>
49#include <sys/time.h>
50#include <sys/resource.h>
51
52#include <err.h>
53#include <errno.h>
54#include <stdio.h>
55#include <stdlib.h>
56#include <string.h>
57#include <pwd.h>
58
59int donice __P((int, int, int));
60static void usage __P((void));
61
62/*
63 * Change the priority (nice) of processes
64 * or groups of processes which are already
65 * running.
66 */
67int
68main(argc, argv)
69	char **argv;
70{
71	int which = PRIO_PROCESS;
72	int who = 0, prio, errs = 0;
73
74	argc--, argv++;
75	if (argc < 2)
76		usage();
77	prio = atoi(*argv);
78	argc--, argv++;
79	if (prio > PRIO_MAX)
80		prio = PRIO_MAX;
81	if (prio < PRIO_MIN)
82		prio = PRIO_MIN;
83	for (; argc > 0; argc--, argv++) {
84		if (strcmp(*argv, "-g") == 0) {
85			which = PRIO_PGRP;
86			continue;
87		}
88		if (strcmp(*argv, "-u") == 0) {
89			which = PRIO_USER;
90			continue;
91		}
92		if (strcmp(*argv, "-p") == 0) {
93			which = PRIO_PROCESS;
94			continue;
95		}
96		if (which == PRIO_USER) {
97			register struct passwd *pwd = getpwnam(*argv);
98
99			if (pwd == NULL) {
100				warnx("%s: unknown user", *argv);
101				continue;
102			}
103			who = pwd->pw_uid;
104		} else {
105			who = atoi(*argv);
106			if (who < 0) {
107				warnx("%s: bad value", *argv);
108				continue;
109			}
110		}
111		errs += donice(which, who, prio);
112	}
113	exit(errs != 0);
114}
115
116static void
117usage()
118{
119	fprintf(stderr,
120"usage: renice priority [ [ -p ] pids ] [ [ -g ] pgrps ] [ [ -u ] users ]\n");
121	exit(1);
122}
123
124int
125donice(which, who, prio)
126	int which, who, prio;
127{
128	int oldprio;
129
130	errno = 0, oldprio = getpriority(which, who);
131	if (oldprio == -1 && errno) {
132		warn("%d: getpriority", who);
133		return (1);
134	}
135	if (setpriority(which, who, prio) < 0) {
136		warn("%d: setpriority", who);
137		return (1);
138	}
139	printf("%d: old priority %d, new priority %d\n", who, oldprio, prio);
140	return (0);
141}
142