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 #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 #include <capsicum_helpers.h> 43 #include <err.h> 44 #include <errno.h> 45 #include <limits.h> 46 #include <signal.h> 47 #include <stdio.h> 48 #include <stdlib.h> 49 #include <time.h> 50 51 static void usage(void) __dead2; 52 53 static volatile sig_atomic_t report_requested; 54 static void 55 report_request(int signo __unused) 56 { 57 58 report_requested = 1; 59 } 60 61 int 62 main(int argc, char *argv[]) 63 { 64 struct timespec time_to_sleep; 65 double d, seconds; 66 time_t original; 67 char unit; 68 char buf[2]; 69 int i, matches; 70 71 if (caph_limit_stdio() < 0 || caph_enter() < 0) 72 err(1, "capsicum"); 73 74 if (argc < 2) 75 usage(); 76 77 seconds = 0; 78 for (i = 1; i < argc; i++) { 79 matches = sscanf(argv[i], "%lf%c%1s", &d, &unit, buf); 80 if (matches == 2) 81 switch(unit) { 82 case 'd': 83 d *= 24; 84 /* FALLTHROUGH */ 85 case 'h': 86 d *= 60; 87 /* FALLTHROUGH */ 88 case 'm': 89 d *= 60; 90 /* FALLTHROUGH */ 91 case 's': 92 break; 93 default: 94 usage(); 95 } 96 else 97 if (matches != 1) 98 usage(); 99 seconds += d; 100 } 101 if (seconds > INT_MAX) 102 usage(); 103 if (seconds <= 0) 104 return (0); 105 original = time_to_sleep.tv_sec = (time_t)seconds; 106 time_to_sleep.tv_nsec = 1e9 * (seconds - time_to_sleep.tv_sec); 107 108 signal(SIGINFO, report_request); 109 110 /* 111 * Note: [EINTR] is supposed to happen only when a signal was handled 112 * but the kernel also returns it when a ptrace-based debugger 113 * attaches. This is a bug but it is hard to fix. 114 */ 115 while (nanosleep(&time_to_sleep, &time_to_sleep) != 0) { 116 if (report_requested) { 117 /* Reporting does not bother with nanoseconds. */ 118 warnx("about %d second(s) left out of the original %d", 119 (int)time_to_sleep.tv_sec, (int)original); 120 report_requested = 0; 121 } else if (errno != EINTR) 122 err(1, "nanosleep"); 123 } 124 return (0); 125 } 126 127 static void 128 usage(void) 129 { 130 131 fprintf(stderr, "usage: sleep number[unit] ...\n"); 132 fprintf(stderr, "Unit can be 's' (seconds, the default), " 133 "m (minutes), h (hours), or d (days).\n"); 134 exit(1); 135 } 136