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
33static 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
40static char sccsid[] = "@(#)nice.c	8.2 (Berkeley) 4/16/94";
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 <ctype.h>
52#include <err.h>
53#include <errno.h>
54#include <limits.h>
55#include <stdio.h>
56#include <stdlib.h>
57#include <unistd.h>
58#include <string.h>
59
60#define	DEFNICE	10
61
62void usage(void);
63
64int
65main(int argc, char *argv[])
66{
67	long niceness = DEFNICE;
68	int ch;
69	char *ep;
70
71	/* Obsolescent syntax: -number, --number */
72	if (argc >= 2 && argv[1][0] == '-' && (argv[1][1] == '-' ||
73	    isdigit((unsigned char)argv[1][1])) && strcmp(argv[1], "--") != 0)
74		if (asprintf(&argv[1], "-n%s", argv[1] + 1) < 0)
75			err(1, "asprintf");
76
77	while ((ch = getopt(argc, argv, "n:")) != -1) {
78		switch (ch) {
79		case 'n':
80			errno = 0;
81			niceness = strtol(optarg, &ep, 10);
82			if (ep == optarg || *ep != '\0' || errno ||
83			    niceness < INT_MIN || niceness > INT_MAX)
84				errx(1, "%s: invalid nice value", optarg);
85			break;
86		default:
87			usage();
88		}
89	}
90	argc -= optind;
91	argv += optind;
92
93	if (argc == 0)
94		usage();
95
96	errno = 0;
97	niceness += getpriority(PRIO_PROCESS, 0);
98	if (errno)
99		warn("getpriority");
100	else if (setpriority(PRIO_PROCESS, 0, (int)niceness))
101		warn("setpriority");
102	execvp(*argv, argv);
103	err(errno == ENOENT ? 127 : 126, "%s", *argv);
104}
105
106void
107usage(void)
108{
109
110	(void)fprintf(stderr,
111	    "usage: nice [-n increment] utility [argument ...]\n");
112	exit(1);
113}
114