1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
|
/*
* Copyright (c) 1988, 1993, 1994
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#ifndef lint
static char const copyright[] =
"@(#) Copyright (c) 1988, 1993, 1994\n\
The Regents of the University of California. All rights reserved.\n";
#endif /* not lint */
#ifndef lint
#if 0
static char sccsid[] = "@(#)sleep.c 8.3 (Berkeley) 4/2/94";
#endif
static const char rcsid[] =
"$FreeBSD$";
#endif /* not lint */
#include <ctype.h>
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <unistd.h>
int main __P((int, char *[]));
void usage __P((void));
int
main(argc, argv)
int argc;
char *argv[];
{
struct timespec time_to_sleep;
long l;
int ch, neg;
char *p;
while ((ch = getopt(argc, argv, "")) != -1)
switch(ch) {
case '?':
default:
usage();
/* NOTREACHED */
}
argc -= optind;
argv += optind;
if (argc != 1) {
usage();
/* NOTREACHED */
}
p = argv[0];
/* Skip over leading whitespaces. */
while (isspace((unsigned char)*p))
++p;
/* Check for optional `+' or `-' sign. */
neg = 0;
if (*p == '-') {
neg = 1;
++p;
}
else if (*p == '+')
++p;
/* Calculate seconds. */
if (isdigit((unsigned char)*p)) {
l = strtol(p, &p, 10);
if (l > INT_MAX) {
/*
* Avoid overflow when `seconds' is huge. This assumes
* that the maximum value for a time_t is >= INT_MAX.
*/
l = INT_MAX;
}
} else
l = 0;
time_to_sleep.tv_sec = (time_t)l;
/* Calculate nanoseconds. */
time_to_sleep.tv_nsec = 0;
if (*p == '.') { /* Decimal point. */
l = 100000000L;
do {
if (isdigit((unsigned char)*++p))
time_to_sleep.tv_nsec += (*p - '0') * l;
else
break;
} while (l /= 10);
}
if (!neg && (time_to_sleep.tv_sec > 0 || time_to_sleep.tv_nsec > 0))
(void)nanosleep(&time_to_sleep, (struct timespec *)NULL);
exit(0);
}
void
usage()
{
(void)fprintf(stderr, "usage: sleep seconds\n");
exit(1);
}
|
