1/*	$NetBSD: renice.c,v 1.17 2007/12/15 19:44:52 perry Exp $	*/
2
3/*
4 * Copyright (c) 1983, 1989, 1993
5 *	The Regents of the University of California.  All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 *    may be used to endorse or promote products derived from this software
17 *    without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32#include <sys/cdefs.h>
33#ifndef lint
34__COPYRIGHT("@(#) Copyright (c) 1983, 1989, 1993\
35 The Regents of the University of California.  All rights reserved.");
36#endif /* not lint */
37
38#ifndef lint
39/*static char sccsid[] = "from: @(#)renice.c	8.1 (Berkeley) 6/9/93";*/
40__RCSID("$NetBSD: renice.c,v 1.17 2007/12/15 19:44:52 perry Exp $");
41#endif /* not lint */
42
43#include <sys/resource.h>
44
45#include <err.h>
46#include <errno.h>
47#include <limits.h>
48#include <pwd.h>
49#include <stdio.h>
50#include <stdlib.h>
51#include <string.h>
52#include <sysexits.h>
53
54static int	getnum(const char *, const char *, int *);
55static int	donice(int, id_t, int, int);
56static void	usage(void) __dead;
57
58/*
59 * Change the priority (nice) of processes
60 * or groups of processes which are already
61 * running.
62 */
63int
64main(int argc, char **argv)
65{
66	int which = PRIO_PROCESS;
67	int prio, errs = 0, incr = 0;
68	id_t who = 0;
69
70	argc--, argv++;
71	if (argc < 2)
72		usage();
73	if (strcmp(*argv, "-n") == 0) {
74		incr = 1;
75		argc--, argv++;
76		if (argc == 0)
77			usage();
78	}
79	if (getnum("priority", *argv, &prio))
80		return 1;
81	argc--, argv++;
82	for (; argc > 0; argc--, argv++) {
83		if (strcmp(*argv, "-g") == 0) {
84			which = PRIO_PGRP;
85			continue;
86		}
87		if (strcmp(*argv, "-u") == 0) {
88			which = PRIO_USER;
89			continue;
90		}
91		if (strcmp(*argv, "-p") == 0) {
92			which = PRIO_PROCESS;
93			continue;
94		}
95		if (which == PRIO_USER) {
96			struct passwd *pwd = getpwnam(*argv);
97
98			if (pwd == NULL) {
99				warnx("%s: unknown user", *argv);
100				errs++;
101				continue;
102			}
103			who = (id_t)pwd->pw_uid;
104		} else {
105			int twho;
106			if (getnum("pid", *argv, &twho)) {
107				errs++;
108				continue;
109			}
110			if (twho < 0) {
111				warnx("%s: bad value", *argv);
112				errs++;
113				continue;
114			}
115			who = (id_t)twho;
116		}
117		errs += donice(which, who, prio, incr);
118	}
119	return errs == 0 ? EXIT_SUCCESS : EXIT_FAILURE;
120}
121
122static int
123getnum(const char *com, const char *str, int *val)
124{
125	long v;
126	char *ep;
127
128	errno = 0;
129	v = strtol(str, &ep, 0);
130
131	if (*ep) {
132		warnx("Bad %s argument: %s", com, str);
133		return 1;
134	}
135	if ((v == LONG_MIN || v == LONG_MAX) && errno == ERANGE) {
136		warn("Invalid %s argument: %s", com, str);
137		return 1;
138	}
139
140	*val = (int)v;
141	return 0;
142}
143
144static int
145donice(int which, id_t who, int prio, int incr)
146{
147	int oldprio;
148
149	errno = 0;
150	if ((oldprio = getpriority(which, who)) == -1 && errno != 0) {
151		warn("%d: getpriority", who);
152		return 1;
153	}
154
155	if (incr)
156		prio = oldprio + prio;
157
158	if (prio > PRIO_MAX)
159		prio = PRIO_MAX;
160	if (prio < PRIO_MIN)
161		prio = PRIO_MIN;
162
163	if (setpriority(which, who, prio) == -1) {
164		warn("%d: setpriority", who);
165		return 1;
166	}
167	(void)printf("%d: old priority %d, new priority %d\n",
168	    who, oldprio, prio);
169	return 0;
170}
171
172static void
173usage(void)
174{
175
176	(void)fprintf(stderr, "Usage: %s [<priority> | -n <incr>] ",
177	    getprogname());
178	(void)fprintf(stderr, "[[-p] <pids>...] [-g <pgrp>...] ");
179	(void)fprintf(stderr, "[-u <user>...]\n");
180	exit(1);
181}
182