renice.c revision 92921 
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 92921 2002-03-22 01:33:25Z imp $";
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(int, int, int);
60static void usage(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	int argc;
70	char **argv;
71{
72	int which = PRIO_PROCESS;
73	int who = 0, prio, errs = 0;
74
75	argc--, argv++;
76	if (argc < 2)
77		usage();
78	prio = atoi(*argv);
79	argc--, argv++;
80	if (prio > PRIO_MAX)
81		prio = PRIO_MAX;
82	if (prio < PRIO_MIN)
83		prio = PRIO_MIN;
84	for (; argc > 0; argc--, argv++) {
85		if (strcmp(*argv, "-g") == 0) {
86			which = PRIO_PGRP;
87			continue;
88		}
89		if (strcmp(*argv, "-u") == 0) {
90			which = PRIO_USER;
91			continue;
92		}
93		if (strcmp(*argv, "-p") == 0) {
94			which = PRIO_PROCESS;
95			continue;
96		}
97		if (which == PRIO_USER) {
98			register struct passwd *pwd = getpwnam(*argv);
99
100			if (pwd == NULL) {
101				warnx("%s: unknown user", *argv);
102				continue;
103			}
104			who = pwd->pw_uid;
105		} else {
106			who = atoi(*argv);
107			if (who < 0) {
108				warnx("%s: bad value", *argv);
109				continue;
110			}
111		}
112		errs += donice(which, who, prio);
113	}
114	exit(errs != 0);
115}
116
117static void
118usage()
119{
120	fprintf(stderr,
121"usage: renice priority [ [ -p ] pids ] [ [ -g ] pgrps ] [ [ -u ] users ]\n");
122	exit(1);
123}
124
125int
126donice(which, who, prio)
127	int which, who, prio;
128{
129	int oldprio;
130
131	errno = 0, oldprio = getpriority(which, who);
132	if (oldprio == -1 && errno) {
133		warn("%d: getpriority", who);
134		return (1);
135	}
136	if (setpriority(which, who, prio) < 0) {
137		warn("%d: setpriority", who);
138		return (1);
139	}
140	printf("%d: old priority %d, new priority %d\n", who, oldprio, prio);
141	return (0);
142}
143