1/*	$OpenBSD: nice.c,v 1.17 2016/10/28 07:22:59 schwarze Exp $	*/
2/*	$NetBSD: nice.c,v 1.9 1995/08/31 23:30:58 jtc Exp $	*/
3
4/*
5 * Copyright (c) 1989 The Regents of the University of California.
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 *    notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in the
15 *    documentation and/or other materials provided with the distribution.
16 * 3. Neither the name of the University nor the names of its contributors
17 *    may be used to endorse or promote products derived from this software
18 *    without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 */
32
33#include <sys/resource.h>
34
35#include <ctype.h>
36#include <err.h>
37#include <errno.h>
38#include <stdio.h>
39#include <stdlib.h>
40#include <unistd.h>
41
42#define	DEFNICE	10
43
44static void __dead usage(void);
45
46int
47main(int argc, char *argv[])
48{
49	const char *errstr;
50	int prio = DEFNICE;
51	int c;
52
53	if (pledge("stdio exec proc", NULL) == -1)
54		err(1, "pledge");
55
56	/* handle obsolete -number syntax */
57	if (argc > 1 && argv[1][0] == '-' &&
58	    isdigit((unsigned char)argv[1][1])) {
59		prio = strtonum(argv[1] + 1, PRIO_MIN, PRIO_MAX, &errstr);
60		if (errstr)
61			errx(1, "increment is %s", errstr);
62		argc--;
63		argv++;
64	}
65
66	while ((c = getopt (argc, argv, "n:")) != -1) {
67		switch (c) {
68		case 'n':
69			prio = strtonum(optarg, PRIO_MIN, PRIO_MAX, &errstr);
70			if (errstr)
71				errx(1, "increment is %s", errstr);
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	prio += getpriority(PRIO_PROCESS, 0);
85	if (errno)
86		err(1, "getpriority");
87	if (setpriority(PRIO_PROCESS, 0, prio))
88		warn("setpriority");
89
90	if (pledge("stdio exec", NULL) == -1)
91		err(1, "pledge");
92
93	execvp(argv[0], &argv[0]);
94	err((errno == ENOENT) ? 127 : 126, "%s", argv[0]);
95}
96
97static void __dead
98usage(void)
99{
100	extern char *__progname;
101	fprintf(stderr, "usage: %s [-n increment] utility [argument ...]\n",
102	    __progname);
103	exit(1);
104}
105