1 /*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 1988, 1993, 1994
5 * The Regents of the University of California. 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 <capsicum_helpers.h>
33 #include <err.h>
34 #include <errno.h>
35 #include <limits.h>
36 #include <math.h>
37 #include <signal.h>
38 #include <stdio.h>
39 #include <stdlib.h>
40 #include <time.h>
41 #include <unistd.h>
42
43 static volatile sig_atomic_t report_requested;
44
45 static void
report_request(int signo __unused)46 report_request(int signo __unused)
47 {
48 report_requested = 1;
49 }
50
51 static void __dead2
usage(void)52 usage(void)
53 {
54 fprintf(stderr, "usage: sleep number[unit] [...]\n"
55 "Unit can be 's' (seconds, the default), "
56 "m (minutes), h (hours), or d (days).\n");
57 exit(1);
58 }
59
60 static double
parse_interval(const char * arg)61 parse_interval(const char *arg)
62 {
63 double num;
64 char unit, extra;
65
66 switch (sscanf(arg, "%lf%c%c", &num, &unit, &extra)) {
67 case 2:
68 switch (unit) {
69 case 'd':
70 num *= 24;
71 /* FALLTHROUGH */
72 case 'h':
73 num *= 60;
74 /* FALLTHROUGH */
75 case 'm':
76 num *= 60;
77 /* FALLTHROUGH */
78 case 's':
79 if (!isnan(num))
80 return (num);
81 }
82 break;
83 case 1:
84 if (!isnan(num))
85 return (num);
86 }
87 warnx("invalid time interval: %s", arg);
88 return (INFINITY);
89 }
90
91 int
main(int argc,char * argv[])92 main(int argc, char *argv[])
93 {
94 struct timespec time_to_sleep;
95 double seconds;
96 time_t original;
97
98 if (caph_limit_stdio() < 0 || caph_enter() < 0)
99 err(1, "capsicum");
100
101 while (getopt(argc, argv, "") != -1)
102 usage();
103 argc -= optind;
104 argv += optind;
105 if (argc < 1)
106 usage();
107
108 seconds = 0;
109 while (argc--)
110 seconds += parse_interval(*argv++);
111 if (seconds > INT_MAX)
112 usage();
113 if (seconds < 1e-9)
114 exit(0);
115 original = time_to_sleep.tv_sec = (time_t)seconds;
116 time_to_sleep.tv_nsec = 1e9 * (seconds - time_to_sleep.tv_sec);
117
118 signal(SIGINFO, report_request);
119
120 while (nanosleep(&time_to_sleep, &time_to_sleep) != 0) {
121 if (errno != EINTR)
122 err(1, "nanosleep");
123 if (report_requested) {
124 /* Reporting does not bother with nanoseconds. */
125 warnx("about %ld second(s) left out of the original %ld",
126 (long)time_to_sleep.tv_sec, (long)original);
127 report_requested = 0;
128 }
129 }
130
131 exit(0);
132 }
133