nfs - Remove unused kerberos code [Userland]
[dragonfly.git] / usr.bin / nice / nice.c
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1/*
2 * Copyright (c) 1989, 1993, 1994
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.
dc71b7ab 13 * 3. Neither the name of the University nor the names of its contributors
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14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
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28 *
29 * @(#) Copyright (c) 1989, 1993, 1994 The Regents of the University of California. All rights reserved.
30 * @(#)nice.c 8.2 (Berkeley) 4/16/94
31 * $FreeBSD: src/usr.bin/nice/nice.c,v 1.4.2.1 2002/06/18 08:40:28 tjr Exp $
4128249a 32 * $DragonFly: src/usr.bin/nice/nice.c,v 1.6 2005/10/09 15:09:02 liamfoy Exp $
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33 */
34
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35#include <sys/time.h>
36#include <sys/resource.h>
37
38#include <ctype.h>
39#include <err.h>
40#include <errno.h>
41#include <limits.h>
42#include <stdio.h>
43#include <stdlib.h>
4128249a 44#include <string.h>
984263bc 45#include <unistd.h>
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46
47#define DEFNICE 10
48
580b75ff 49static void usage(void);
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50
51int
1d1731fa 52main(int argc, char **argv)
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53{
54 long niceness = DEFNICE;
55 int ch;
56 char *ep;
57
58 /* Obsolescent syntax: -number, --number */
59 if (argc >= 2 && argv[1][0] == '-' && (argv[1][1] == '-' ||
580b75ff 60 isdigit(argv[1][1])) && strcmp(argv[1], "--") != 0)
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61 if (asprintf(&argv[1], "-n%s", argv[1] + 1) < 0)
62 err(1, "asprintf");
63
64 while ((ch = getopt(argc, argv, "n:")) != -1) {
65 switch (ch) {
66 case 'n':
67 errno = 0;
68 niceness = strtol(optarg, &ep, 10);
69 if (ep == optarg || *ep != '\0' || errno ||
70 niceness < INT_MIN || niceness > INT_MAX)
71 errx(1, "%s: invalid nice value", optarg);
72 break;
73 default:
74 usage();
75 }
76 }
77 argc -= optind;
78 argv += optind;
79
80 if (argc == 0)
81 usage();
82
83 errno = 0;
84 niceness += getpriority(PRIO_PROCESS, 0);
85 if (errno)
86 warn("getpriority");
87 else if (setpriority(PRIO_PROCESS, 0, (int)niceness))
88 warn("setpriority");
89 execvp(*argv, argv);
4128249a 90 err(errno == ENOENT || errno == ENOTDIR ? 127 : 126, "%s", *argv);
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91}
92
580b75ff 93static void
1d1731fa 94usage(void)
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95{
96
1dfb33ef 97 fprintf(stderr, "usage: nice [-n incr] utility [arguments]\n");
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98 exit(1);
99}