leave.c revision 1591 
1/*
2 * Copyright (c) 1980, 1988, 1993
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. All advertising materials mentioning features or use of this software
14 *    must display the following acknowledgement:
15 *	This product includes software developed by the University of
16 *	California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 *    may be used to endorse or promote products derived from this software
19 *    without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34#ifndef lint
35static char copyright[] =
36"@(#) Copyright (c) 1980, 1988, 1993\n\
37	The Regents of the University of California.  All rights reserved.\n";
38#endif /* not lint */
39
40#ifndef lint
41static char sccsid[] = "@(#)leave.c	8.1 (Berkeley) 6/6/93";
42#endif /* not lint */
43
44#include <sys/param.h>
45#include <sys/time.h>
46#include <stdio.h>
47#include <ctype.h>
48
49/*
50 * leave [[+]hhmm]
51 *
52 * Reminds you when you have to leave.
53 * Leave prompts for input and goes away if you hit return.
54 * It nags you like a mother hen.
55 */
56main(argc, argv)
57	int argc;
58	char **argv;
59{
60	register u_int secs;
61	register int hours, minutes;
62	register char c, *cp;
63	struct tm *t, *localtime();
64	time_t now, time();
65	int plusnow;
66	char buf[50];
67
68	if (argc < 2) {
69#define	MSG1	"When do you have to leave? "
70		(void)write(1, MSG1, sizeof(MSG1) - 1);
71		cp = fgets(buf, sizeof(buf), stdin);
72		if (*cp == '\n')
73			exit(0);
74	} else
75		cp = argv[1];
76
77	if (*cp == '+') {
78		plusnow = 1;
79		++cp;
80	} else {
81		plusnow = 0;
82		(void)time(&now);
83		t = localtime(&now);
84	}
85
86	for (hours = 0; (c = *cp) && c != '\n'; ++cp) {
87		if (!isdigit(c))
88			usage();
89		hours = hours * 10 + (c - '0');
90	}
91	minutes = hours % 100;
92	hours /= 100;
93
94	if (minutes < 0 || minutes > 59)
95		usage();
96	if (plusnow)
97		secs = hours * 60 * 60 + minutes * 60;
98	else {
99		if (hours > 23 || t->tm_hour > hours ||
100		    t->tm_hour == hours && minutes <= t->tm_min)
101			usage();
102		secs = (hours - t->tm_hour) * 60 * 60;
103		secs += (minutes - t->tm_min) * 60;
104	}
105	doalarm(secs);
106	exit(0);
107}
108
109doalarm(secs)
110	u_int secs;
111{
112	register int bother;
113	time_t daytime, time();
114	int pid;
115	char *ctime();
116
117	if (pid = fork()) {
118		(void)time(&daytime);
119		daytime += secs;
120		printf("Alarm set for %.16s. (pid %d)\n",
121		    ctime(&daytime), pid);
122		exit(0);
123	}
124	sleep((u_int)2);		/* let parent print set message */
125
126	/*
127	 * if write fails, we've lost the terminal through someone else
128	 * causing a vhangup by logging in.
129	 */
130#define	FIVEMIN	(5 * 60)
131#define	MSG2	"\07\07You have to leave in 5 minutes.\n"
132	if (secs >= FIVEMIN) {
133		sleep(secs - FIVEMIN);
134		if (write(1, MSG2, sizeof(MSG2) - 1) != sizeof(MSG2) - 1)
135			exit(0);
136		secs = FIVEMIN;
137	}
138
139#define	ONEMIN	(60)
140#define	MSG3	"\07\07Just one more minute!\n"
141	if (secs >= ONEMIN) {
142		sleep(secs - ONEMIN);
143		if (write(1, MSG3, sizeof(MSG3) - 1) != sizeof(MSG3) - 1)
144			exit(0);
145	}
146
147#define	MSG4	"\07\07Time to leave!\n"
148	for (bother = 10; bother--;) {
149		sleep((u_int)ONEMIN);
150		if (write(1, MSG4, sizeof(MSG4) - 1) != sizeof(MSG4) - 1)
151			exit(0);
152	}
153
154#define	MSG5	"\07\07That was the last time I'll tell you.  Bye.\n"
155	(void)write(1, MSG5, sizeof(MSG5) - 1);
156	exit(0);
157}
158
159usage()
160{
161	fprintf(stderr, "usage: leave [[+]hhmm]\n");
162	exit(1);
163}
164