1 /* $OpenBSD: sleep.c,v 1.10 2001/05/20 08:04:48 mickey Exp $ */ 2 /* $NetBSD: sleep.c,v 1.8 1995/03/21 09:11:11 cgd Exp $ */ 3 4 /* 5 * Copyright (c) 1988, 1993, 1994 6 * The Regents of the University of California. All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by the University of 19 * California, Berkeley and its contributors. 20 * 4. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 */ 36 37 #ifndef lint 38 static char copyright[] = 39 "@(#) Copyright (c) 1988, 1993, 1994\n\ 40 The Regents of the University of California. All rights reserved.\n"; 41 #endif /* not lint */ 42 43 #ifndef lint 44 #if 0 45 static char sccsid[] = "@(#)sleep.c 8.3 (Berkeley) 4/2/94"; 46 #else 47 static char rcsid[] = "$OpenBSD: sleep.c,v 1.10 2001/05/20 08:04:48 mickey Exp $"; 48 #endif 49 #endif /* not lint */ 50 51 #include <ctype.h> 52 #include <errno.h> 53 #include <locale.h> 54 #include <signal.h> 55 #include <stdio.h> 56 #include <stdlib.h> 57 #include <time.h> 58 #include <unistd.h> 59 60 void usage __P((void)); 61 void alarmh __P((int)); 62 63 int 64 main(argc, argv) 65 int argc; 66 char *argv[]; 67 { 68 int ch; 69 time_t secs = 0, t; 70 unsigned char *cp; 71 long nsecs = 0; 72 struct timespec rqtp; 73 int i; 74 75 setlocale(LC_ALL, ""); 76 77 signal(SIGALRM, alarmh); 78 79 while ((ch = getopt(argc, argv, "")) != -1) 80 switch(ch) { 81 case '?': 82 case 'h': 83 default: 84 usage(); 85 } 86 argc -= optind; 87 argv += optind; 88 89 if (argc != 1) 90 usage(); 91 92 cp = *argv; 93 while ((*cp != '\0') && (*cp != '.')) { 94 if (!isdigit(*cp)) usage(); 95 t = (secs * 10) + (*cp++ - '0'); 96 if (t / 10 != secs) /* oflow */ 97 return (EINVAL); 98 secs = t; 99 } 100 101 /* Handle fractions of a second */ 102 if (*cp == '.') { 103 *cp++ = '\0'; 104 for (i = 100000000; i > 0; i /= 10) { 105 if (*cp == '\0') break; 106 if (!isdigit(*cp)) usage(); 107 nsecs += (*cp++ - '0') * i; 108 } 109 110 /* 111 * We parse all the way down to nanoseconds 112 * in the above for loop. Be pedantic about 113 * checking the rest of the argument. 114 */ 115 while (*cp != '\0') { 116 if (!isdigit(*cp++)) usage(); 117 } 118 } 119 120 rqtp.tv_sec = secs; 121 rqtp.tv_nsec = nsecs; 122 123 if ((secs > 0) || (nsecs > 0)) 124 if (nanosleep(&rqtp, NULL)) 125 return (errno); 126 return (0); 127 } 128 129 void 130 usage() 131 { 132 133 (void)fprintf(stderr, "usage: sleep seconds\n"); 134 exit(1); 135 } 136 137 /* 138 * POSIX 1003.2 says sleep should exit with 0 return code on reception 139 * of SIGALRM. 140 */ 141 void 142 alarmh(sigraised) 143 int sigraised; 144 { 145 /* 146 * exit() flushes stdio buffers, which is not legal in a signal 147 * handler. Use _exit(). 148 */ 149 _exit(0); 150 } 151