1 /*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 1989, 1993, 1994
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) 1989, 1993, 1994\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[] = "@(#)nice.c 8.2 (Berkeley) 4/16/94";
41 #endif /* not lint */
42 #endif
43
44 #include <sys/cdefs.h>
45 #include <sys/types.h>
46 #include <sys/time.h>
47 #include <sys/resource.h>
48
49 #include <ctype.h>
50 #include <err.h>
51 #include <errno.h>
52 #include <limits.h>
53 #include <stdio.h>
54 #include <stdlib.h>
55 #include <unistd.h>
56 #include <string.h>
57
58 #define DEFNICE 10
59
60 void usage(void);
61
62 int
main(int argc,char * argv[])63 main(int argc, char *argv[])
64 {
65 long niceness = DEFNICE;
66 int ch;
67 char *ep;
68
69 /* Obsolescent syntax: -number, --number */
70 if (argc >= 2 && argv[1][0] == '-' && (argv[1][1] == '-' ||
71 isdigit((unsigned char)argv[1][1])) && strcmp(argv[1], "--") != 0)
72 if (asprintf(&argv[1], "-n%s", argv[1] + 1) < 0)
73 err(1, "asprintf");
74
75 while ((ch = getopt(argc, argv, "n:")) != -1) {
76 switch (ch) {
77 case 'n':
78 errno = 0;
79 niceness = strtol(optarg, &ep, 10);
80 if (ep == optarg || *ep != '\0' || errno ||
81 niceness < INT_MIN || niceness > INT_MAX)
82 errx(1, "%s: invalid nice value", optarg);
83 break;
84 default:
85 usage();
86 }
87 }
88 argc -= optind;
89 argv += optind;
90
91 if (argc == 0)
92 usage();
93
94 errno = 0;
95 niceness += getpriority(PRIO_PROCESS, 0);
96 if (errno)
97 warn("getpriority");
98 else if (setpriority(PRIO_PROCESS, 0, (int)niceness))
99 warn("setpriority");
100 execvp(*argv, argv);
101 err(errno == ENOENT ? 127 : 126, "%s", *argv);
102 }
103
104 void
usage(void)105 usage(void)
106 {
107
108 (void)fprintf(stderr,
109 "usage: nice [-n increment] utility [argument ...]\n");
110 exit(1);
111 }
112