leave.c revision 27572 
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 const 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
41#if 0
42static char sccsid[] = "@(#)leave.c	8.1 (Berkeley) 6/6/93";
43#endif
44static const char rcsid[] =
45	"$Id$";
46#endif /* not lint */
47
48#include <sys/param.h>
49#include <sys/time.h>
50#include <ctype.h>
51#include <stdio.h>
52#include <unistd.h>
53
54void doalarm __P((u_int));
55static void usage __P((void));
56
57/*
58 * leave [[+]hhmm]
59 *
60 * Reminds you when you have to leave.
61 * Leave prompts for input and goes away if you hit return.
62 * It nags you like a mother hen.
63 */
64int
65main(argc, argv)
66	int argc;
67	char **argv;
68{
69	register u_int secs;
70	register int hours, minutes;
71	register char c, *cp;
72	struct tm *t, *localtime();
73	time_t now, time();
74	int plusnow;
75	char buf[50];
76
77	if (argc < 2) {
78#define	MSG1	"When do you have to leave? "
79		(void)write(1, MSG1, sizeof(MSG1) - 1);
80		cp = fgets(buf, sizeof(buf), stdin);
81		if (cp == NULL || *cp == '\n')
82			exit(0);
83	} else
84		cp = argv[1];
85
86	if (*cp == '+') {
87		plusnow = 1;
88		++cp;
89	} else {
90		plusnow = 0;
91		(void)time(&now);
92		t = localtime(&now);
93	}
94
95	for (hours = 0; (c = *cp) && c != '\n'; ++cp) {
96		if (!isdigit(c))
97			usage();
98		hours = hours * 10 + (c - '0');
99	}
100	minutes = hours % 100;
101	hours /= 100;
102
103	if (minutes < 0 || minutes > 59)
104		usage();
105	if (plusnow)
106		secs = hours * 60 * 60 + minutes * 60;
107	else {
108		if (hours > 23 || t->tm_hour > hours ||
109		    (t->tm_hour == hours && minutes <= t->tm_min))
110			usage();
111		secs = (hours - t->tm_hour) * 60 * 60;
112		secs += (minutes - t->tm_min) * 60;
113	}
114	doalarm(secs);
115	exit(0);
116}
117
118void
119doalarm(secs)
120	u_int secs;
121{
122	register int bother;
123	time_t daytime, time();
124	int pid;
125	char *ctime();
126
127	if ((pid = fork())) {
128		(void)time(&daytime);
129		daytime += secs;
130		printf("Alarm set for %.16s. (pid %d)\n",
131		    ctime(&daytime), pid);
132		exit(0);
133	}
134	sleep((u_int)2);		/* let parent print set message */
135
136	/*
137	 * if write fails, we've lost the terminal through someone else
138	 * causing a vhangup by logging in.
139	 */
140#define	FIVEMIN	(5 * 60)
141#define	MSG2	"\07\07You have to leave in 5 minutes.\n"
142	if (secs >= FIVEMIN) {
143		sleep(secs - FIVEMIN);
144		if (write(1, MSG2, sizeof(MSG2) - 1) != sizeof(MSG2) - 1)
145			exit(0);
146		secs = FIVEMIN;
147	}
148
149#define	ONEMIN	(60)
150#define	MSG3	"\07\07Just one more minute!\n"
151	if (secs >= ONEMIN) {
152		sleep(secs - ONEMIN);
153		if (write(1, MSG3, sizeof(MSG3) - 1) != sizeof(MSG3) - 1)
154			exit(0);
155	}
156
157#define	MSG4	"\07\07Time to leave!\n"
158	for (bother = 10; bother--;) {
159		sleep((u_int)ONEMIN);
160		if (write(1, MSG4, sizeof(MSG4) - 1) != sizeof(MSG4) - 1)
161			exit(0);
162	}
163
164#define	MSG5	"\07\07That was the last time I'll tell you.  Bye.\n"
165	(void)write(1, MSG5, sizeof(MSG5) - 1);
166	exit(0);
167}
168
169static void
170usage()
171{
172	fprintf(stderr, "usage: leave [[+]hhmm]\n");
173	exit(1);
174}
175