Annotation of prex-old/usr/bin/nice/nice.c, Revision 1.1.1.1
1.1 nbrk 1: /*
2: * Copyright (c) 1989 The Regents of the University of California.
3: * 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: * 3. 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: #include <prex/prex.h>
31:
32: #include <sys/types.h>
33: #include <sys/time.h>
34: #include <sys/resource.h>
35:
36: #include <ctype.h>
37: #include <errno.h>
38: #include <stdio.h>
39: #include <stdlib.h>
40: #include <unistd.h>
41: #include <string.h>
42: #include <err.h>
43:
44: #ifdef CMDBOX
45: #define main(argc, argv) nice_main(argc, argv)
46: #endif
47:
48: #define DEFNICE 10
49:
50: static void usage(void);
51:
52: int
53: main(int argc, char *argv[])
54: {
55: int niceness = DEFNICE;
56: int c;
57:
58: /* handle obsolete -number syntax */
59: if (argc > 1 && argv[1][0] == '-' &&
60: isdigit((unsigned char)argv[1][1])) {
61: niceness = atoi (argv[1] + 1);
62: argc--; argv++;
63: }
64:
65: while ((c = getopt (argc, argv, "n:")) != -1) {
66: switch (c) {
67: case 'n':
68: niceness = atoi (optarg);
69: break;
70:
71: case '?':
72: default:
73: usage();
74: break;
75: }
76: }
77: argc -= optind; argv += optind;
78:
79: if (argc == 0)
80: usage();
81:
82: errno = 0;
83: niceness += getpriority(PRIO_PROCESS, 0);
84: if (errno) {
85: err (1, "getpriority");
86: /* NOTREACHED */
87: }
88: if (setpriority(PRIO_PROCESS, 0, niceness)) {
89: warn ("setpriority");
90: }
91:
92: execvp(argv[0], &argv[0]);
93: err ((errno == ENOENT) ? 127 : 126, "%s", argv[0]);
94: /* NOTREACHED */
95: return 0;
96: }
97:
98: static void
99: usage()
100: {
101: (void)fprintf(stderr,
102: "usage: nice [ -n increment ] utility [ argument ...]\n");
103: exit(1);
104: }
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