1 /*-
2 * SPDX-License-Identifier: BSD-3-Clause
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 #ifndef lint
33 static const char copyright[] =
34 "@(#) Copyright (c) 1983, 1989, 1993\n\
35 The Regents of the University of California. All rights reserved.\n";
36 #endif /* not lint */
37
38 #if 0
39 #ifndef lint
40 static char sccsid[] = "@(#)renice.c 8.1 (Berkeley) 6/9/93";
41 #endif /* not lint */
42 #endif
43
44 #include <sys/cdefs.h>
45 __FBSDID("$FreeBSD$");
46
47 #include <sys/types.h>
48 #include <sys/time.h>
49 #include <sys/resource.h>
50
51 #include <err.h>
52 #include <errno.h>
53 #include <limits.h>
54 #include <pwd.h>
55 #include <stdio.h>
56 #include <stdlib.h>
57 #include <string.h>
58
59 static int donice(int, int, int, int);
60 static int getnum(const char *, const char *, int *);
61 static void usage(void);
62
63 /*
64 * Change the priority (nice) of processes
65 * or groups of processes which are already
66 * running.
67 */
68 int
main(int argc,char * argv[])69 main(int argc, char *argv[])
70 {
71 struct passwd *pwd;
72 int errs, incr, prio, which, who;
73
74 errs = 0;
75 incr = 0;
76 which = PRIO_PROCESS;
77 who = 0;
78 argc--, argv++;
79 if (argc < 2)
80 usage();
81 if (strcmp(*argv, "-n") == 0) {
82 incr = 1;
83 argc--, argv++;
84 if (argc < 2)
85 usage();
86 }
87 if (getnum("priority", *argv, &prio))
88 return (1);
89 argc--, argv++;
90 for (; argc > 0; argc--, argv++) {
91 if (strcmp(*argv, "-g") == 0) {
92 which = PRIO_PGRP;
93 continue;
94 }
95 if (strcmp(*argv, "-u") == 0) {
96 which = PRIO_USER;
97 continue;
98 }
99 if (strcmp(*argv, "-p") == 0) {
100 which = PRIO_PROCESS;
101 continue;
102 }
103 if (which == PRIO_USER) {
104 if ((pwd = getpwnam(*argv)) != NULL)
105 who = pwd->pw_uid;
106 else if (getnum("uid", *argv, &who)) {
107 errs++;
108 continue;
109 } else if (who < 0) {
110 warnx("%s: bad value", *argv);
111 errs++;
112 continue;
113 }
114 } else {
115 if (getnum("pid", *argv, &who)) {
116 errs++;
117 continue;
118 }
119 if (who < 0) {
120 warnx("%s: bad value", *argv);
121 errs++;
122 continue;
123 }
124 }
125 errs += donice(which, who, prio, incr);
126 }
127 exit(errs != 0);
128 }
129
130 static int
donice(int which,int who,int prio,int incr)131 donice(int which, int who, int prio, int incr)
132 {
133 int oldprio;
134
135 errno = 0;
136 oldprio = getpriority(which, who);
137 if (oldprio == -1 && errno) {
138 warn("%d: getpriority", who);
139 return (1);
140 }
141 if (incr)
142 prio = oldprio + prio;
143 if (prio > PRIO_MAX)
144 prio = PRIO_MAX;
145 if (prio < PRIO_MIN)
146 prio = PRIO_MIN;
147 if (setpriority(which, who, prio) < 0) {
148 warn("%d: setpriority", who);
149 return (1);
150 }
151 fprintf(stderr, "%d: old priority %d, new priority %d\n", who,
152 oldprio, prio);
153 return (0);
154 }
155
156 static int
getnum(const char * com,const char * str,int * val)157 getnum(const char *com, const char *str, int *val)
158 {
159 long v;
160 char *ep;
161
162 errno = 0;
163 v = strtol(str, &ep, 10);
164 if (v < INT_MIN || v > INT_MAX || errno == ERANGE) {
165 warnx("%s argument %s is out of range.", com, str);
166 return (1);
167 }
168 if (ep == str || *ep != '\0' || errno != 0) {
169 warnx("Bad %s argument: %s.", com, str);
170 return (1);
171 }
172
173 *val = (int)v;
174 return (0);
175 }
176
177 static void
usage(void)178 usage(void)
179 {
180 fprintf(stderr, "%s\n%s\n",
181 "usage: renice priority [[-p] pid ...] [[-g] pgrp ...] [[-u] user ...]",
182 " renice -n increment [[-p] pid ...] [[-g] pgrp ...] [[-u] user ...]");
183 exit(1);
184 }
185