renice.c revision 94355 
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 94355 2002-04-10 11:09:46Z maxim $";
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 <limits.h>
55#include <pwd.h>
56#include <stdio.h>
57#include <stdlib.h>
58#include <string.h>
59
60static int	donice(int, int, int, int);
61static int	getnum(const char *, const char *, int *);
62static void	usage(void);
63
64/*
65 * Change the priority (nice) of processes
66 * or groups of processes which are already
67 * running.
68 */
69int
70main(int argc, char *argv[])
71{
72	struct passwd *pwd;
73	int errs, incr, prio, which, who;
74
75	errs = 0;
76	incr = 0;
77	which = PRIO_PROCESS;
78	who = 0;
79	argc--, argv++;
80	if (argc < 2)
81		usage();
82	if (strcmp(*argv, "-n") == 0) {
83		incr = 1;
84		argc--, argv++;
85		if (argc == 0)
86			usage();
87	}
88	if (getnum("priority", *argv, &prio))
89		return (1);
90	prio = atoi(*argv);
91	argc--, argv++;
92	if (prio > PRIO_MAX)
93		prio = PRIO_MAX;
94	if (prio < PRIO_MIN)
95		prio = PRIO_MIN;
96	for (; argc > 0; argc--, argv++) {
97		if (strcmp(*argv, "-g") == 0) {
98			which = PRIO_PGRP;
99			continue;
100		}
101		if (strcmp(*argv, "-u") == 0) {
102			which = PRIO_USER;
103			continue;
104		}
105		if (strcmp(*argv, "-p") == 0) {
106			which = PRIO_PROCESS;
107			continue;
108		}
109		if (which == PRIO_USER) {
110			pwd = getpwnam(*argv);
111			if (pwd == NULL) {
112				warnx("%s: unknown user", *argv);
113				continue;
114			}
115			who = pwd->pw_uid;
116		} else {
117			if (getnum("pid", *argv, &who))
118				continue;
119			if (who < 0) {
120				warnx("%s: bad value", *argv);
121				continue;
122			}
123		}
124		errs += donice(which, who, prio, incr);
125	}
126	exit(errs != 0);
127}
128
129static int
130donice(int which, int who, int prio, int incr)
131{
132	int oldprio;
133
134	errno = 0;
135	oldprio = getpriority(which, who);
136	if (oldprio == -1 && errno) {
137		warn("%d: getpriority", who);
138		return (1);
139	}
140	if (incr)
141		prio = oldprio + prio;
142	if (prio > PRIO_MAX)
143		prio = PRIO_MAX;
144	if (prio < PRIO_MIN)
145		prio = PRIO_MIN;
146	if (setpriority(which, who, prio) < 0) {
147		warn("%d: setpriority", who);
148		return (1);
149	}
150	printf("%d: old priority %d, new priority %d\n", who, oldprio, prio);
151	return (0);
152}
153
154static int
155getnum(const char *com, const char *str, int *val)
156{
157	long v;
158	char *ep;
159
160	errno = 0;
161	v = strtol(str, &ep, NULL);
162	if (v < INT_MIN || v > INT_MAX || errno == ERANGE) {
163		warnx("%s argument %s is out of range.", com, str);
164		return (1);
165	}
166	if (ep == str || *ep != '\0' || errno != 0) {
167		warnx("Bad %s argument: %s.", com, str);
168		return (1);
169	}
170
171	*val = (int)v;
172	return (0);
173}
174
175static void
176usage()
177{
178	fprintf(stderr, "%s\n%s\n",
179"usage: renice [priority | [-n incr]] [ [ -p ] pids ] [ [ -g ] pgrps ]",
180"              [ [ -u ] users ]");
181	exit(1);
182}
183