1 /* 2 * Copyright (c) 1980, 1986 The Regents of the University of California. 3 * All rights reserved. 4 * 5 * %sccs.include.redist.c% 6 */ 7 8 #ifndef lint 9 char copyright[] = 10 "@(#) Copyright (c) 1980, 1986 The Regents of the University of California.\n\ 11 All rights reserved.\n"; 12 #endif /* not lint */ 13 14 #ifndef lint 15 static char sccsid[] = "@(#)halt.c 5.10 (Berkeley) 04/03/91"; 16 #endif /* not lint */ 17 18 /* 19 * Halt 20 */ 21 #include <sys/types.h> 22 #include <sys/reboot.h> 23 #include <sys/time.h> 24 #include <sys/syslog.h> 25 #include <sys/signal.h> 26 #include <errno.h> 27 #include <pwd.h> 28 #include <stdio.h> 29 #include <paths.h> 30 31 main(argc, argv) 32 int argc; 33 char **argv; 34 { 35 register int i; 36 register int qflag = 0; 37 struct passwd *pw; 38 int ch, howto, needlog = 1; 39 char *user, *ttyn, *getlogin(), *ttyname(); 40 41 howto = RB_HALT; 42 ttyn = ttyname(2); 43 while ((ch = getopt(argc, argv, "lnqy")) != EOF) 44 switch((char)ch) { 45 case 'l': /* undocumented; for shutdown(8) */ 46 needlog = 0; 47 break; 48 case 'n': 49 howto |= RB_NOSYNC; 50 break; 51 case 'q': 52 qflag++; 53 break; 54 case 'y': 55 ttyn = 0; 56 break; 57 case '?': 58 default: 59 fprintf(stderr, "usage: halt [-nqy]\n"); 60 exit(1); 61 } 62 63 if (ttyn && ttyn[sizeof(_PATH_TTY) - 1] == 'd') { 64 fprintf(stderr, "halt: dangerous on a dialup; use ``halt -y'' if you are really sure\n"); 65 exit(1); 66 } 67 68 if (needlog) { 69 openlog("halt", 0, LOG_AUTH); 70 if ((user = getlogin()) == NULL) 71 if ((pw = getpwuid(getuid()))) 72 user = pw->pw_name; 73 else 74 user = "???"; 75 syslog(LOG_CRIT, "halted by %s", user); 76 } 77 78 signal(SIGHUP, SIG_IGN); /* for network connections */ 79 if (kill(1, SIGTSTP) == -1) { 80 fprintf(stderr, "halt: can't idle init\n"); 81 exit(1); 82 } 83 sleep(1); 84 (void) kill(-1, SIGTERM); /* one chance to catch it */ 85 sleep(5); 86 87 if (!qflag) for (i = 1; ; i++) { 88 if (kill(-1, SIGKILL) == -1) { 89 extern int errno; 90 91 if (errno == ESRCH) 92 break; 93 94 perror("halt: kill"); 95 kill(1, SIGHUP); 96 exit(1); 97 } 98 if (i > 5) { 99 fprintf(stderr, 100 "CAUTION: some process(es) wouldn't die\n"); 101 break; 102 } 103 setalarm(2 * i); 104 pause(); 105 } 106 107 if (!qflag && (howto & RB_NOSYNC) == 0) { 108 logwtmp("~", "shutdown", ""); 109 sync(); 110 setalarm(5); 111 pause(); 112 } 113 reboot(howto); 114 perror("halt"); 115 } 116 117 void 118 dingdong() 119 { 120 /* RRRIIINNNGGG RRRIIINNNGGG */ 121 } 122 123 setalarm(n) 124 int n; 125 { 126 signal(SIGALRM, dingdong); 127 alarm(n); 128 } 129