xref: /netbsd-src/usr.bin/nice/nice.c (revision 23c8222edbfb0f0932d88a8351d3a0cf817dfb9e)
1 /*	$NetBSD: nice.c,v 1.12 2003/08/07 11:15:24 agc Exp $	*/
2 
3 /*
4  * Copyright (c) 1989 The Regents of the University of California.
5  * 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/cdefs.h>
33 #ifndef lint
34 __COPYRIGHT(
35     "@(#) Copyright (c) 1989 The Regents of the University of California.\n\
36  All rights reserved.\n");
37 #endif /* not lint */
38 
39 #ifndef lint
40 #if 0
41 static char sccsid[] = "@(#)nice.c	5.4 (Berkeley) 6/1/90";
42 #endif
43 __RCSID("$NetBSD: nice.c,v 1.12 2003/08/07 11:15:24 agc Exp $");
44 #endif /* not lint */
45 
46 #include <sys/types.h>
47 #include <sys/time.h>
48 #include <sys/resource.h>
49 #include <stdio.h>
50 #include <stdlib.h>
51 #include <string.h>
52 #include <locale.h>
53 #include <ctype.h>
54 #include <errno.h>
55 #include <err.h>
56 #include <unistd.h>
57 
58 #define	DEFNICE	10
59 
60 int	main __P((int, char **));
61 static void usage __P((void));
62 
63 int
64 main(argc, argv)
65 	int argc;
66 	char **argv;
67 {
68 	int niceness = DEFNICE;
69 	int c;
70 
71 	setlocale(LC_ALL, "");
72 
73         /* handle obsolete -number syntax */
74         if (argc > 1 && argv[1][0] == '-' &&
75 	    isdigit((unsigned char)argv[1][1])) {
76 		niceness = atoi (argv[1] + 1);
77                 argc--; argv++;
78         }
79 
80 	while ((c = getopt (argc, argv, "n:")) != -1) {
81 		switch (c) {
82 		case 'n':
83 			niceness = atoi (optarg);
84 			break;
85 
86 		case '?':
87 		default:
88 			usage();
89 			break;
90 		}
91 	}
92 	argc -= optind; argv += optind;
93 
94 	if (argc == 0)
95 		usage();
96 
97 	errno = 0;
98 	niceness += getpriority(PRIO_PROCESS, 0);
99 	if (errno) {
100 		err (1, "getpriority");
101 		/* NOTREACHED */
102 	}
103 	if (setpriority(PRIO_PROCESS, 0, niceness)) {
104 		warn ("setpriority");
105 	}
106 
107 	execvp(argv[0], &argv[0]);
108 	err ((errno == ENOENT) ? 127 : 126, "%s", argv[0]);
109 	/* NOTREACHED */
110 }
111 
112 static void
113 usage()
114 {
115 	(void)fprintf(stderr,
116 	    "usage: nice [ -n increment ] utility [ argument ...]\n");
117 
118 	exit(1);
119 }
120