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 #if 0
31 #ifndef lint
32 static 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
38 static 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 <capsicum_helpers.h>
45 #include <err.h>
46 #include <errno.h>
47 #include <limits.h>
48 #include <signal.h>
49 #include <stdio.h>
50 #include <stdlib.h>
51 #include <time.h>
52
53 static void usage(void);
54
55 static volatile sig_atomic_t report_requested;
56 static void
report_request(int signo __unused)57 report_request(int signo __unused)
58 {
59
60 report_requested = 1;
61 }
62
63 int
main(int argc,char * argv[])64 main(int argc, char *argv[])
65 {
66 struct timespec time_to_sleep;
67 double d;
68 time_t original;
69 char buf[2];
70
71 if (caph_limit_stdio() < 0 || caph_enter() < 0)
72 err(1, "capsicum");
73
74 if (argc != 2)
75 usage();
76
77 if (sscanf(argv[1], "%lf%1s", &d, buf) != 1)
78 usage();
79 if (d > INT_MAX)
80 usage();
81 if (d <= 0)
82 return (0);
83 original = time_to_sleep.tv_sec = (time_t)d;
84 time_to_sleep.tv_nsec = 1e9 * (d - time_to_sleep.tv_sec);
85
86 signal(SIGINFO, report_request);
87
88 /*
89 * Note: [EINTR] is supposed to happen only when a signal was handled
90 * but the kernel also returns it when a ptrace-based debugger
91 * attaches. This is a bug but it is hard to fix.
92 */
93 while (nanosleep(&time_to_sleep, &time_to_sleep) != 0) {
94 if (report_requested) {
95 /* Reporting does not bother with nanoseconds. */
96 warnx("about %d second(s) left out of the original %d",
97 (int)time_to_sleep.tv_sec, (int)original);
98 report_requested = 0;
99 } else if (errno != EINTR)
100 err(1, "nanosleep");
101 }
102 return (0);
103 }
104
105 static void
usage(void)106 usage(void)
107 {
108
109 fprintf(stderr, "usage: sleep seconds\n");
110 exit(1);
111 }
112