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.
13 * 4. Neither the name of the University nor the names of its contributors
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.
28 */
29
30#ifndef lint
31static const char copyright[] =
32"@(#) Copyright (c) 1989, 1993, 1994\n\
33	The Regents of the University of California.  All rights reserved.\n";
34#endif /* not lint */
35
36#if 0
37#ifndef lint
38static char sccsid[] = "@(#)nice.c	8.2 (Berkeley) 4/16/94";
39#endif /* not lint */
40#endif
41
42#include <sys/cdefs.h>
43__FBSDID("$FreeBSD$");
44
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
60void usage(void);
61
62int
63main(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
104void
105usage(void)
106{
107
108	(void)fprintf(stderr,
109	    "usage: nice [-n increment] utility [argument ...]\n");
110	exit(1);
111}
112