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 #include <sys/types.h>
33 #include <sys/time.h>
34 #include <sys/resource.h>
35
36 #include <ctype.h>
37 #include <err.h>
38 #include <errno.h>
39 #include <limits.h>
40 #include <stdio.h>
41 #include <stdlib.h>
42 #include <unistd.h>
43 #include <string.h>
44
45 #define DEFNICE 10
46
47 void usage(void);
48
49 int
main(int argc,char * argv[])50 main(int argc, char *argv[])
51 {
52 long niceness = DEFNICE;
53 int ch;
54 char *ep;
55
56 /* Obsolescent syntax: -number, --number */
57 if (argc >= 2 && argv[1][0] == '-' && (argv[1][1] == '-' ||
58 isdigit((unsigned char)argv[1][1])) && strcmp(argv[1], "--") != 0)
59 if (asprintf(&argv[1], "-n%s", argv[1] + 1) < 0)
60 err(1, "asprintf");
61
62 while ((ch = getopt(argc, argv, "n:")) != -1) {
63 switch (ch) {
64 case 'n':
65 errno = 0;
66 niceness = strtol(optarg, &ep, 10);
67 if (ep == optarg || *ep != '\0' || errno ||
68 niceness < INT_MIN || niceness > INT_MAX)
69 errx(1, "%s: invalid nice value", optarg);
70 break;
71 default:
72 usage();
73 }
74 }
75 argc -= optind;
76 argv += optind;
77
78 if (argc == 0)
79 usage();
80
81 errno = 0;
82 niceness += getpriority(PRIO_PROCESS, 0);
83 if (errno)
84 warn("getpriority");
85 else if (setpriority(PRIO_PROCESS, 0, (int)niceness))
86 warn("setpriority");
87 execvp(*argv, argv);
88 err(errno == ENOENT ? 127 : 126, "%s", *argv);
89 }
90
91 void
usage(void)92 usage(void)
93 {
94
95 (void)fprintf(stderr,
96 "usage: nice [-n increment] utility [argument ...]\n");
97 exit(1);
98 }
99