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 #endif 38 #include <sys/cdefs.h> 39 #include <capsicum_helpers.h> 40 #include <err.h> 41 #include <errno.h> 42 #include <limits.h> 43 #include <signal.h> 44 #include <stdio.h> 45 #include <stdlib.h> 46 #include <time.h> 47 48 static void usage(void) __dead2; 49 50 static volatile sig_atomic_t report_requested; 51 static void 52 report_request(int signo __unused) 53 { 54 55 report_requested = 1; 56 } 57 58 int 59 main(int argc, char *argv[]) 60 { 61 struct timespec time_to_sleep; 62 double d, seconds; 63 time_t original; 64 char unit; 65 char buf[2]; 66 int i, matches; 67 68 if (caph_limit_stdio() < 0 || caph_enter() < 0) 69 err(1, "capsicum"); 70 71 if (argc < 2) 72 usage(); 73 74 seconds = 0; 75 for (i = 1; i < argc; i++) { 76 matches = sscanf(argv[i], "%lf%c%1s", &d, &unit, buf); 77 if (matches == 2) 78 switch(unit) { 79 case 'd': 80 d *= 24; 81 /* FALLTHROUGH */ 82 case 'h': 83 d *= 60; 84 /* FALLTHROUGH */ 85 case 'm': 86 d *= 60; 87 /* FALLTHROUGH */ 88 case 's': 89 break; 90 default: 91 usage(); 92 } 93 else 94 if (matches != 1) 95 usage(); 96 seconds += d; 97 } 98 if (seconds > INT_MAX) 99 usage(); 100 if (seconds <= 0) 101 return (0); 102 original = time_to_sleep.tv_sec = (time_t)seconds; 103 time_to_sleep.tv_nsec = 1e9 * (seconds - time_to_sleep.tv_sec); 104 105 signal(SIGINFO, report_request); 106 107 /* 108 * Note: [EINTR] is supposed to happen only when a signal was handled 109 * but the kernel also returns it when a ptrace-based debugger 110 * attaches. This is a bug but it is hard to fix. 111 */ 112 while (nanosleep(&time_to_sleep, &time_to_sleep) != 0) { 113 if (report_requested) { 114 /* Reporting does not bother with nanoseconds. */ 115 warnx("about %d second(s) left out of the original %d", 116 (int)time_to_sleep.tv_sec, (int)original); 117 report_requested = 0; 118 } else if (errno != EINTR) 119 err(1, "nanosleep"); 120 } 121 return (0); 122 } 123 124 static void 125 usage(void) 126 { 127 128 fprintf(stderr, "usage: sleep number[unit] ...\n"); 129 fprintf(stderr, "Unit can be 's' (seconds, the default), " 130 "m (minutes), h (hours), or d (days).\n"); 131 exit(1); 132 } 133