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 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 <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 54 static void usage(void); 55 56 static volatile sig_atomic_t report_requested; 57 static void 58 report_request(int signo __unused) 59 { 60 61 report_requested = 1; 62 } 63 64 int 65 main(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 } 102 103 static void 104 usage(void) 105 { 106 107 fprintf(stderr, "usage: sleep seconds\n"); 108 exit(1); 109 } 110