1 /* $NetBSD: leave.c,v 1.14 2008/07/21 14:19:23 lukem Exp $ */ 2 3 /* 4 * Copyright (c) 1980, 1988, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 #include <sys/cdefs.h> 33 #ifndef lint 34 __COPYRIGHT("@(#) Copyright (c) 1980, 1988, 1993\ 35 The Regents of the University of California. All rights reserved."); 36 #endif /* not lint */ 37 38 #ifndef lint 39 #if 0 40 static char sccsid[] = "@(#)leave.c 8.1 (Berkeley) 6/6/93"; 41 #else 42 __RCSID("$NetBSD: leave.c,v 1.14 2008/07/21 14:19:23 lukem Exp $"); 43 #endif 44 #endif /* not lint */ 45 46 #include <sys/param.h> 47 #include <sys/time.h> 48 #include <ctype.h> 49 #include <stdio.h> 50 #include <stdlib.h> 51 #include <time.h> 52 #include <err.h> 53 #include <unistd.h> 54 55 #define SECOND 1 56 #define MINUTE (SECOND * 60) 57 #define HOUR (MINUTE * 60) 58 59 /* 60 * leave [[+]hhmm] 61 * 62 * Reminds you when you have to leave. 63 * Leave prompts for input and goes away if you hit return. 64 * It nags you like a mother hen. 65 */ 66 67 int main(int argc, char **argv); 68 69 static void doalarm(u_int); 70 static void usage(void); 71 72 int 73 main(int argc, char **argv) 74 { 75 u_int secs; 76 int hours, minutes; 77 char c, *cp; 78 struct tm *t = NULL; 79 time_t now; 80 int plusnow; 81 char buf[50]; 82 83 if (setvbuf(stdout, NULL, _IONBF, 0) != 0) 84 errx(1, "Cannot set stdout to unbuffered."); 85 86 if (argc < 2) { 87 (void)puts("When do you have to leave? "); 88 cp = fgets(buf, sizeof(buf), stdin); 89 if (cp == NULL || *cp == '\n') 90 exit(0); 91 } else 92 cp = argv[1]; 93 94 if (*cp == '+') { 95 plusnow = 1; 96 ++cp; 97 } else { 98 plusnow = 0; 99 (void)time(&now); 100 t = localtime(&now); 101 } 102 103 for (hours = 0; (c = *cp) && c != '\n'; ++cp) { 104 if (!isdigit((unsigned char)c)) 105 usage(); 106 hours = hours * 10 + (c - '0'); 107 } 108 minutes = hours % 100; 109 hours /= 100; 110 111 if (minutes < 0 || minutes > 59) 112 usage(); 113 if (plusnow) 114 secs = (hours * HOUR) + (minutes * MINUTE); 115 else { 116 if (hours > 23) 117 usage(); 118 if (t->tm_hour >= 12) 119 t->tm_hour -= 12; 120 if (hours >= 12) 121 hours -= 12; 122 if (t->tm_hour > hours || 123 (t->tm_hour == hours && minutes <= t->tm_min)) 124 hours += 12; 125 secs = (hours - t->tm_hour) * HOUR; 126 secs += (minutes - t->tm_min) * MINUTE; 127 } 128 doalarm(secs); 129 exit(0); 130 } 131 132 static void 133 doalarm(u_int secs) 134 { 135 int bother; 136 time_t daytime; 137 138 switch (fork()) { 139 case 0: 140 break; 141 case -1: 142 err(1, "Fork failed"); 143 /*NOTREACHED*/ 144 default: 145 exit(0); 146 } 147 148 (void)time(&daytime); 149 daytime += secs; 150 printf("Alarm set for %.16s. (pid %u)\n", 151 ctime(&daytime), (unsigned)getpid()); 152 153 /* 154 * if write fails, we've lost the terminal through someone else 155 * causing a vhangup by logging in. 156 */ 157 #define FIVEMIN (5 * MINUTE) 158 if (secs >= FIVEMIN) { 159 sleep(secs - FIVEMIN); 160 if (puts("\07\07You have to leave in 5 minutes.\n") == EOF) 161 exit(0); 162 secs = FIVEMIN; 163 } 164 165 #define ONEMIN (MINUTE) 166 if (secs >= ONEMIN) { 167 sleep(secs - ONEMIN); 168 if (puts("\07\07Just one more minute!\n") == EOF) 169 exit(0); 170 } 171 172 for (bother = 10; bother--;) { 173 sleep((u_int)ONEMIN); 174 if (puts("\07\07Time to leave!\n") == EOF) 175 exit(0); 176 } 177 178 (void)puts("\07\07That was the last time I'll tell you. Bye.\n"); 179 exit(0); 180 } 181 182 static void 183 usage(void) 184 { 185 (void)fprintf(stderr, "usage: %s [[+]hhmm]\n", getprogname()); 186 exit(1); 187 } 188