renice.c revision 111569 
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#if 0
41#ifndef lint
42static char sccsid[] = "@(#)renice.c	8.1 (Berkeley) 6/9/93";
43#endif /* not lint */
44#endif
45
46#include <sys/cdefs.h>
47__FBSDID("$FreeBSD: head/usr.bin/renice/renice.c 111569 2003-02-26 20:27:24Z charnier $");
48
49#include <sys/types.h>
50#include <sys/time.h>
51#include <sys/resource.h>
52
53#include <err.h>
54#include <errno.h>
55#include <limits.h>
56#include <pwd.h>
57#include <stdio.h>
58#include <stdlib.h>
59#include <string.h>
60
61static int	donice(int, int, int, int);
62static int	getnum(const char *, const char *, int *);
63static void	usage(void);
64
65/*
66 * Change the priority (nice) of processes
67 * or groups of processes which are already
68 * running.
69 */
70int
71main(int argc, char *argv[])
72{
73	struct passwd *pwd;
74	int errs, incr, prio, which, who;
75
76	errs = 0;
77	incr = 0;
78	which = PRIO_PROCESS;
79	who = 0;
80	argc--, argv++;
81	if (argc < 2)
82		usage();
83	if (strcmp(*argv, "-n") == 0) {
84		incr = 1;
85		argc--, argv++;
86		if (argc < 2)
87			usage();
88	}
89	if (getnum("priority", *argv, &prio))
90		return (1);
91	argc--, argv++;
92	for (; argc > 0; argc--, argv++) {
93		if (strcmp(*argv, "-g") == 0) {
94			which = PRIO_PGRP;
95			continue;
96		}
97		if (strcmp(*argv, "-u") == 0) {
98			which = PRIO_USER;
99			continue;
100		}
101		if (strcmp(*argv, "-p") == 0) {
102			which = PRIO_PROCESS;
103			continue;
104		}
105		if (which == PRIO_USER) {
106			if ((pwd = getpwnam(*argv)) != NULL)
107				who = pwd->pw_uid;
108			else if (getnum("uid", *argv, &who)) {
109				errs++;
110				continue;
111			} else if (who < 0) {
112				warnx("%s: bad value", *argv);
113				errs++;
114				continue;
115			}
116		} else {
117			if (getnum("pid", *argv, &who)) {
118				errs++;
119				continue;
120			}
121			if (who < 0) {
122				warnx("%s: bad value", *argv);
123				errs++;
124				continue;
125			}
126		}
127		errs += donice(which, who, prio, incr);
128	}
129	exit(errs != 0);
130}
131
132static int
133donice(int which, int who, int prio, int incr)
134{
135	int oldprio;
136
137	errno = 0;
138	oldprio = getpriority(which, who);
139	if (oldprio == -1 && errno) {
140		warn("%d: getpriority", who);
141		return (1);
142	}
143	if (incr)
144		prio = oldprio + prio;
145	if (prio > PRIO_MAX)
146		prio = PRIO_MAX;
147	if (prio < PRIO_MIN)
148		prio = PRIO_MIN;
149	if (setpriority(which, who, prio) < 0) {
150		warn("%d: setpriority", who);
151		return (1);
152	}
153	fprintf(stderr, "%d: old priority %d, new priority %d\n", who,
154	    oldprio, prio);
155	return (0);
156}
157
158static int
159getnum(const char *com, const char *str, int *val)
160{
161	long v;
162	char *ep;
163
164	errno = 0;
165	v = strtol(str, &ep, 10);
166	if (v < INT_MIN || v > INT_MAX || errno == ERANGE) {
167		warnx("%s argument %s is out of range.", com, str);
168		return (1);
169	}
170	if (ep == str || *ep != '\0' || errno != 0) {
171		warnx("Bad %s argument: %s.", com, str);
172		return (1);
173	}
174
175	*val = (int)v;
176	return (0);
177}
178
179static void
180usage()
181{
182	fprintf(stderr, "%s\n%s\n",
183"usage: renice priority     [[-p] pid ...] [[-g] pgrp ...] [[-u] user ...]",
184"       renice -n increment [[-p] pid ...] [[-g] pgrp ...] [[-u] user ...]");
185	exit(1);
186}
187