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.
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 <capsicum_helpers.h>
31 #include <err.h>
32 #include <errno.h>
33 #include <limits.h>
34 #include <math.h>
35 #include <signal.h>
36 #include <stdio.h>
37 #include <stdlib.h>
38 #include <time.h>
39 #include <unistd.h>
40
41 static volatile sig_atomic_t report_requested;
42
43 static void
report_request(int signo __unused)44 report_request(int signo __unused)
45 {
46 report_requested = 1;
47 }
48
49 static void __dead2
usage(void)50 usage(void)
51 {
52 fprintf(stderr, "usage: sleep number[unit] [...]\n"
53 "Unit can be 's' (seconds, the default), "
54 "m (minutes), h (hours), or d (days).\n");
55 exit(1);
56 }
57
58 static double
parse_interval(const char * arg)59 parse_interval(const char *arg)
60 {
61 double num;
62 char unit, extra;
63
64 switch (sscanf(arg, "%lf%c%c", &num, &unit, &extra)) {
65 case 2:
66 switch (unit) {
67 case 'd':
68 num *= 24;
69 /* FALLTHROUGH */
70 case 'h':
71 num *= 60;
72 /* FALLTHROUGH */
73 case 'm':
74 num *= 60;
75 /* FALLTHROUGH */
76 case 's':
77 if (!isnan(num))
78 return (num);
79 }
80 break;
81 case 1:
82 if (!isnan(num))
83 return (num);
84 }
85 warnx("invalid time interval: %s", arg);
86 return (INFINITY);
87 }
88
89 int
main(int argc,char * argv[])90 main(int argc, char *argv[])
91 {
92 struct timespec time_to_sleep;
93 double seconds;
94 time_t original;
95
96 if (caph_limit_stdio() < 0 || caph_enter() < 0)
97 err(1, "capsicum");
98
99 while (getopt(argc, argv, "") != -1)
100 usage();
101 argc -= optind;
102 argv += optind;
103 if (argc < 1)
104 usage();
105
106 seconds = 0;
107 while (argc--)
108 seconds += parse_interval(*argv++);
109 if (seconds > INT_MAX)
110 usage();
111 if (seconds < 1e-9)
112 exit(0);
113 original = time_to_sleep.tv_sec = (time_t)seconds;
114 time_to_sleep.tv_nsec = 1e9 * (seconds - time_to_sleep.tv_sec);
115
116 signal(SIGINFO, report_request);
117
118 while (nanosleep(&time_to_sleep, &time_to_sleep) != 0) {
119 if (errno != EINTR)
120 err(1, "nanosleep");
121 if (report_requested) {
122 /* Reporting does not bother with nanoseconds. */
123 warnx("about %ld second(s) left out of the original %ld",
124 (long)time_to_sleep.tv_sec, (long)original);
125 report_requested = 0;
126 }
127 }
128
129 exit(0);
130 }
131