gdb - Local mods (compile)
[dragonfly.git] / bin / sleep / sleep.c
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1/*
2 * Copyright (c) 1988, 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.
dc71b7ab 13 * 3. Neither the name of the University nor the names of its contributors
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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.
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28 *
29 * @(#) Copyright (c) 1988, 1993, 1994 The Regents of the University of California. All rights reserved.
30 * @(#)sleep.c 8.3 (Berkeley) 4/2/94
31 * $FreeBSD: src/bin/sleep/sleep.c,v 1.9.2.1 2001/08/01 05:23:25 obrien Exp $
acea3a2a 32 * $DragonFly: src/bin/sleep/sleep.c,v 1.7 2005/02/27 15:57:15 liamfoy Exp $
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33 */
34
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35#include <ctype.h>
36#include <limits.h>
113f6df6 37#include <locale.h>
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38#include <stdio.h>
39#include <stdlib.h>
40#include <time.h>
41#include <unistd.h>
42
113f6df6 43static void usage(void);
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44
45int
b5744197 46main(int argc, char **argv)
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47{
48 struct timespec time_to_sleep;
49 long l;
50 int ch, neg;
51 char *p;
52
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53 setlocale(LC_ALL, "");
54
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55 while ((ch = getopt(argc, argv, "")) != -1)
56 switch(ch) {
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57 default:
58 usage();
59 /* NOTREACHED */
60 }
61 argc -= optind;
62 argv += optind;
63
64 if (argc != 1) {
65 usage();
66 /* NOTREACHED */
67 }
68
69 p = argv[0];
70
71 /* Skip over leading whitespaces. */
113f6df6 72 while (isspace(*p))
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73 ++p;
74
75 /* Check for optional `+' or `-' sign. */
76 neg = 0;
77 if (*p == '-') {
78 neg = 1;
79 ++p;
80 }
81 else if (*p == '+')
82 ++p;
83
84 /* Calculate seconds. */
113f6df6 85 if (isdigit(*p)) {
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86 l = strtol(p, &p, 10);
87 if (l > INT_MAX) {
88 /*
89 * Avoid overflow when `seconds' is huge. This assumes
acea3a2a 90 * that the maximum value for a time_t is <= INT_MAX.
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91 */
92 l = INT_MAX;
93 }
94 } else
95 l = 0;
96 time_to_sleep.tv_sec = (time_t)l;
97
98 /* Calculate nanoseconds. */
99 time_to_sleep.tv_nsec = 0;
100
101 if (*p == '.') { /* Decimal point. */
102 l = 100000000L;
103 do {
113f6df6 104 if (isdigit(*++p))
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105 time_to_sleep.tv_nsec += (*p - '0') * l;
106 else
107 break;
108 } while (l /= 10);
109 }
110
111 if (!neg && (time_to_sleep.tv_sec > 0 || time_to_sleep.tv_nsec > 0))
2038fb68 112 nanosleep(&time_to_sleep, NULL);
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113
114 exit(0);
115}
116
113f6df6 117static void
b5744197 118usage(void)
984263bc 119{
57fed2af 120 fprintf(stderr, "usage: sleep seconds\n");
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121 exit(1);
122}