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 57 report_request(int signo __unused) 58 { 59 60 report_requested = 1; 61 } 62 63 int 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 106 usage(void) 107 { 108 109 fprintf(stderr, "usage: sleep seconds\n"); 110 exit(1); 111 } 112