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
41static volatile sig_atomic_t report_requested;
42
43static void
44report_request(int signo __unused)
45{
46	report_requested = 1;
47}
48
49static void __dead2
50usage(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
58static double
59parse_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
89int
90main(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