1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1988, 1993, 1994 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 #include <capsicum_helpers.h> 33 #include <err.h> 34 #include <errno.h> 35 #include <limits.h> 36 #include <math.h> 37 #include <signal.h> 38 #include <stdio.h> 39 #include <stdlib.h> 40 #include <time.h> 41 #include <unistd.h> 42 43 static volatile sig_atomic_t report_requested; 44 45 static void 46 report_request(int signo __unused) 47 { 48 report_requested = 1; 49 } 50 51 static void __dead2 52 usage(void) 53 { 54 fprintf(stderr, "usage: sleep number[unit] [...]\n" 55 "Unit can be 's' (seconds, the default), " 56 "m (minutes), h (hours), or d (days).\n"); 57 exit(1); 58 } 59 60 static double 61 parse_interval(const char *arg) 62 { 63 double num; 64 char unit, extra; 65 66 switch (sscanf(arg, "%lf%c%c", &num, &unit, &extra)) { 67 case 2: 68 switch (unit) { 69 case 'd': 70 num *= 24; 71 /* FALLTHROUGH */ 72 case 'h': 73 num *= 60; 74 /* FALLTHROUGH */ 75 case 'm': 76 num *= 60; 77 /* FALLTHROUGH */ 78 case 's': 79 if (!isnan(num)) 80 return (num); 81 } 82 break; 83 case 1: 84 if (!isnan(num)) 85 return (num); 86 } 87 warnx("invalid time interval: %s", arg); 88 return (INFINITY); 89 } 90 91 int 92 main(int argc, char *argv[]) 93 { 94 struct timespec time_to_sleep; 95 double seconds; 96 time_t original; 97 98 if (caph_limit_stdio() < 0 || caph_enter() < 0) 99 err(1, "capsicum"); 100 101 while (getopt(argc, argv, "") != -1) 102 usage(); 103 argc -= optind; 104 argv += optind; 105 if (argc < 1) 106 usage(); 107 108 seconds = 0; 109 while (argc--) 110 seconds += parse_interval(*argv++); 111 if (seconds > INT_MAX) 112 usage(); 113 if (seconds < 1e-9) 114 exit(0); 115 original = time_to_sleep.tv_sec = (time_t)seconds; 116 time_to_sleep.tv_nsec = 1e9 * (seconds - time_to_sleep.tv_sec); 117 118 signal(SIGINFO, report_request); 119 120 while (nanosleep(&time_to_sleep, &time_to_sleep) != 0) { 121 if (errno != EINTR) 122 err(1, "nanosleep"); 123 if (report_requested) { 124 /* Reporting does not bother with nanoseconds. */ 125 warnx("about %ld second(s) left out of the original %ld", 126 (long)time_to_sleep.tv_sec, (long)original); 127 report_requested = 0; 128 } 129 } 130 131 exit(0); 132 } 133