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1711f82e WJ |
1 | /* |
2 | * Copyright (c) 1980, 1986 The Regents of the University of California. | |
3 | * 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 | |
35 | char copyright[] = | |
36 | "@(#) Copyright (c) 1980, 1986 The Regents of the University of California.\n\ | |
37 | All rights reserved.\n"; | |
38 | #endif /* not lint */ | |
39 | ||
40 | #ifndef lint | |
41 | static char sccsid[] = "@(#)halt.c 5.10 (Berkeley) 4/3/91"; | |
42 | #endif /* not lint */ | |
43 | ||
44 | /* | |
45 | * Halt | |
46 | */ | |
47 | #include <sys/types.h> | |
48 | #include <sys/reboot.h> | |
49 | #include <sys/time.h> | |
50 | #include <sys/syslog.h> | |
51 | #include <sys/signal.h> | |
52 | #include <errno.h> | |
53 | #include <pwd.h> | |
54 | #include <stdio.h> | |
55 | #include <paths.h> | |
56 | ||
57 | main(argc, argv) | |
58 | int argc; | |
59 | char **argv; | |
60 | { | |
61 | register int i; | |
62 | register int qflag = 0; | |
63 | struct passwd *pw; | |
64 | int ch, howto, needlog = 1; | |
65 | char *user, *ttyn, *getlogin(), *ttyname(); | |
66 | ||
67 | howto = RB_HALT; | |
68 | ttyn = ttyname(2); | |
69 | while ((ch = getopt(argc, argv, "lnqy")) != EOF) | |
70 | switch((char)ch) { | |
71 | case 'l': /* undocumented; for shutdown(8) */ | |
72 | needlog = 0; | |
73 | break; | |
74 | case 'n': | |
75 | howto |= RB_NOSYNC; | |
76 | break; | |
77 | case 'q': | |
78 | qflag++; | |
79 | break; | |
80 | case 'y': | |
81 | ttyn = 0; | |
82 | break; | |
83 | case '?': | |
84 | default: | |
85 | fprintf(stderr, "usage: halt [-nqy]\n"); | |
86 | exit(1); | |
87 | } | |
88 | ||
89 | if (ttyn && ttyn[sizeof(_PATH_TTY) - 1] == 'd') { | |
90 | fprintf(stderr, "halt: dangerous on a dialup; use ``halt -y'' if you are really sure\n"); | |
91 | exit(1); | |
92 | } | |
93 | ||
94 | if (needlog) { | |
95 | openlog("halt", 0, LOG_AUTH); | |
96 | if ((user = getlogin()) == NULL) | |
97 | if ((pw = getpwuid(getuid()))) | |
98 | user = pw->pw_name; | |
99 | else | |
100 | user = "???"; | |
101 | syslog(LOG_CRIT, "halted by %s", user); | |
102 | } | |
103 | ||
104 | signal(SIGHUP, SIG_IGN); /* for network connections */ | |
105 | if (kill(1, SIGTSTP) == -1) { | |
106 | fprintf(stderr, "halt: can't idle init\n"); | |
107 | exit(1); | |
108 | } | |
109 | sleep(1); | |
110 | (void) kill(-1, SIGTERM); /* one chance to catch it */ | |
111 | sleep(5); | |
112 | ||
113 | if (!qflag) for (i = 1; ; i++) { | |
114 | if (kill(-1, SIGKILL) == -1) { | |
115 | extern int errno; | |
116 | ||
117 | if (errno == ESRCH) | |
118 | break; | |
119 | ||
120 | perror("halt: kill"); | |
121 | kill(1, SIGHUP); | |
122 | exit(1); | |
123 | } | |
124 | if (i > 5) { | |
125 | fprintf(stderr, | |
126 | "CAUTION: some process(es) wouldn't die\n"); | |
127 | break; | |
128 | } | |
129 | setalarm(2 * i); | |
130 | pause(); | |
131 | } | |
132 | ||
133 | if (!qflag && (howto & RB_NOSYNC) == 0) { | |
134 | logwtmp("~", "shutdown", ""); | |
135 | sync(); | |
136 | setalarm(5); | |
137 | pause(); | |
138 | } | |
139 | reboot(howto); | |
140 | perror("halt"); | |
141 | } | |
142 | ||
143 | void | |
144 | dingdong() | |
145 | { | |
146 | /* RRRIIINNNGGG RRRIIINNNGGG */ | |
147 | } | |
148 | ||
149 | setalarm(n) | |
150 | int n; | |
151 | { | |
152 | signal(SIGALRM, dingdong); | |
153 | alarm(n); | |
154 | } |