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 * 4. 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#if 0
31#ifndef lint
32static char const copyright[] =
33"@(#) Copyright (c) 1988, 1993, 1994\n\
34	The Regents of the University of California.  All rights reserved.\n";
35#endif /* not lint */
36
37#ifndef lint
38static char sccsid[] = "@(#)sleep.c	8.3 (Berkeley) 4/2/94";
39#endif /* not lint */
40#endif
41#include <sys/cdefs.h>
42__FBSDID("$FreeBSD$");
43
44#include <ctype.h>
45#include <err.h>
46#include <errno.h>
47#include <limits.h>
48#include <signal.h>
49#include <stdint.h>
50#include <stdio.h>
51#include <stdlib.h>
52#include <time.h>
53
54static void usage(void);
55
56static volatile sig_atomic_t report_requested;
57static void
58report_request(int signo __unused)
59{
60
61	report_requested = 1;
62}
63
64int
65main(int argc, char *argv[])
66{
67	struct timespec time_to_sleep;
68	double d;
69	time_t original;
70	char buf[2];
71
72	if (argc != 2)
73		usage();
74
75	if (sscanf(argv[1], "%lf%1s", &d, buf) != 1)
76		usage();
77	if (d > INT_MAX)
78		usage();
79	if (d <= 0)
80		return (0);
81	original = time_to_sleep.tv_sec = (time_t)d;
82	time_to_sleep.tv_nsec = 1e9 * (d - time_to_sleep.tv_sec);
83
84	signal(SIGINFO, report_request);
85
86	/*
87	 * Note: [EINTR] is supposed to happen only when a signal was handled
88	 * but the kernel also returns it when a ptrace-based debugger
89	 * attaches. This is a bug but it is hard to fix.
90	 */
91	while (nanosleep(&time_to_sleep, &time_to_sleep) != 0) {
92		if (report_requested) {
93			/* Reporting does not bother with nanoseconds. */
94			warnx("about %d second(s) left out of the original %d",
95			    (int)time_to_sleep.tv_sec, (int)original);
96			report_requested = 0;
97		} else if (errno != EINTR)
98			err(1, "nanosleep");
99	}
100	return (0);
101}
102
103static void
104usage(void)
105{
106
107	fprintf(stderr, "usage: sleep seconds\n");
108	exit(1);
109}
110