renice.c revision 50477 
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 50477 1999-08-28 01:08:13Z peter $";
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 <stdio.h>
54#include <stdlib.h>
55#include <pwd.h>
56
57int donice __P((int, int, int));
58static void usage __P((void));
59
60/*
61 * Change the priority (nice) of processes
62 * or groups of processes which are already
63 * running.
64 */
65int
66main(argc, argv)
67	char **argv;
68{
69	int which = PRIO_PROCESS;
70	int who = 0, prio, errs = 0;
71
72	argc--, argv++;
73	if (argc < 2)
74		usage();
75	prio = atoi(*argv);
76	argc--, argv++;
77	if (prio > PRIO_MAX)
78		prio = PRIO_MAX;
79	if (prio < PRIO_MIN)
80		prio = PRIO_MIN;
81	for (; argc > 0; argc--, argv++) {
82		if (strcmp(*argv, "-g") == 0) {
83			which = PRIO_PGRP;
84			continue;
85		}
86		if (strcmp(*argv, "-u") == 0) {
87			which = PRIO_USER;
88			continue;
89		}
90		if (strcmp(*argv, "-p") == 0) {
91			which = PRIO_PROCESS;
92			continue;
93		}
94		if (which == PRIO_USER) {
95			register struct passwd *pwd = getpwnam(*argv);
96
97			if (pwd == NULL) {
98				warnx("%s: unknown user", *argv);
99				continue;
100			}
101			who = pwd->pw_uid;
102		} else {
103			who = atoi(*argv);
104			if (who < 0) {
105				warnx("%s: bad value", *argv);
106				continue;
107			}
108		}
109		errs += donice(which, who, prio);
110	}
111	exit(errs != 0);
112}
113
114static void
115usage()
116{
117	fprintf(stderr,
118"usage: renice priority [ [ -p ] pids ] [ [ -g ] pgrps ] [ [ -u ] users ]\n");
119	exit(1);
120}
121
122int
123donice(which, who, prio)
124	int which, who, prio;
125{
126	int oldprio;
127	extern int errno;
128
129	errno = 0, oldprio = getpriority(which, who);
130	if (oldprio == -1 && errno) {
131		warn("%d: getpriority", who);
132		return (1);
133	}
134	if (setpriority(which, who, prio) < 0) {
135		warn("%d: setpriority", who);
136		return (1);
137	}
138	printf("%d: old priority %d, new priority %d\n", who, oldprio, prio);
139	return (0);
140}
141