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 <signal.h> 35 #include <stdio.h> 36 #include <stdlib.h> 37 #include <time.h> 38 39 static void usage(void) __dead2; 40 41 static volatile sig_atomic_t report_requested; 42 static void 43 report_request(int signo __unused) 44 { 45 46 report_requested = 1; 47 } 48 49 int 50 main(int argc, char *argv[]) 51 { 52 struct timespec time_to_sleep; 53 double d, seconds; 54 time_t original; 55 char unit; 56 char buf[2]; 57 int i, matches; 58 59 if (caph_limit_stdio() < 0 || caph_enter() < 0) 60 err(1, "capsicum"); 61 62 if (argc < 2) 63 usage(); 64 65 seconds = 0; 66 for (i = 1; i < argc; i++) { 67 matches = sscanf(argv[i], "%lf%c%1s", &d, &unit, buf); 68 if (matches == 2) 69 switch(unit) { 70 case 'd': 71 d *= 24; 72 /* FALLTHROUGH */ 73 case 'h': 74 d *= 60; 75 /* FALLTHROUGH */ 76 case 'm': 77 d *= 60; 78 /* FALLTHROUGH */ 79 case 's': 80 break; 81 default: 82 usage(); 83 } 84 else 85 if (matches != 1) 86 usage(); 87 seconds += d; 88 } 89 if (seconds > INT_MAX) 90 usage(); 91 if (seconds <= 0) 92 return (0); 93 original = time_to_sleep.tv_sec = (time_t)seconds; 94 time_to_sleep.tv_nsec = 1e9 * (seconds - time_to_sleep.tv_sec); 95 96 signal(SIGINFO, report_request); 97 98 /* 99 * Note: [EINTR] is supposed to happen only when a signal was handled 100 * but the kernel also returns it when a ptrace-based debugger 101 * attaches. This is a bug but it is hard to fix. 102 */ 103 while (nanosleep(&time_to_sleep, &time_to_sleep) != 0) { 104 if (report_requested) { 105 /* Reporting does not bother with nanoseconds. */ 106 warnx("about %d second(s) left out of the original %d", 107 (int)time_to_sleep.tv_sec, (int)original); 108 report_requested = 0; 109 } else if (errno != EINTR) 110 err(1, "nanosleep"); 111 } 112 return (0); 113 } 114 115 static void 116 usage(void) 117 { 118 119 fprintf(stderr, "usage: sleep number[unit] ...\n"); 120 fprintf(stderr, "Unit can be 's' (seconds, the default), " 121 "m (minutes), h (hours), or d (days).\n"); 122 exit(1); 123 } 124