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 #include <capsicum_helpers.h> 31 #include <err.h> 32 #include <errno.h> 33 #include <limits.h> 34 #include <math.h> 35 #include <signal.h> 36 #include <stdio.h> 37 #include <stdlib.h> 38 #include <time.h> 39 #include <unistd.h> 40 41 static volatile sig_atomic_t report_requested; 42 43 static void 44 report_request(int signo __unused) 45 { 46 report_requested = 1; 47 } 48 49 static void __dead2 50 usage(void) 51 { 52 fprintf(stderr, "usage: sleep number[unit] [...]\n" 53 "Unit can be 's' (seconds, the default), " 54 "m (minutes), h (hours), or d (days).\n"); 55 exit(1); 56 } 57 58 static double 59 parse_interval(const char *arg) 60 { 61 double num; 62 char unit, extra; 63 64 switch (sscanf(arg, "%lf%c%c", &num, &unit, &extra)) { 65 case 2: 66 switch (unit) { 67 case 'd': 68 num *= 24; 69 /* FALLTHROUGH */ 70 case 'h': 71 num *= 60; 72 /* FALLTHROUGH */ 73 case 'm': 74 num *= 60; 75 /* FALLTHROUGH */ 76 case 's': 77 if (!isnan(num)) 78 return (num); 79 } 80 break; 81 case 1: 82 if (!isnan(num)) 83 return (num); 84 } 85 warnx("invalid time interval: %s", arg); 86 return (INFINITY); 87 } 88 89 int 90 main(int argc, char *argv[]) 91 { 92 struct timespec time_to_sleep; 93 double seconds; 94 time_t original; 95 96 if (caph_limit_stdio() < 0 || caph_enter() < 0) 97 err(1, "capsicum"); 98 99 while (getopt(argc, argv, "") != -1) 100 usage(); 101 argc -= optind; 102 argv += optind; 103 if (argc < 1) 104 usage(); 105 106 seconds = 0; 107 while (argc--) 108 seconds += parse_interval(*argv++); 109 if (seconds > INT_MAX) 110 usage(); 111 if (seconds < 1e-9) 112 exit(0); 113 original = time_to_sleep.tv_sec = (time_t)seconds; 114 time_to_sleep.tv_nsec = 1e9 * (seconds - time_to_sleep.tv_sec); 115 116 signal(SIGINFO, report_request); 117 118 while (nanosleep(&time_to_sleep, &time_to_sleep) != 0) { 119 if (errno != EINTR) 120 err(1, "nanosleep"); 121 if (report_requested) { 122 /* Reporting does not bother with nanoseconds. */ 123 warnx("about %ld second(s) left out of the original %ld", 124 (long)time_to_sleep.tv_sec, (long)original); 125 report_requested = 0; 126 } 127 } 128 129 exit(0); 130 } 131