/* * Copyright (c) 1980,1986 Regents of the University of California. * All rights reserved. The Berkeley software License Agreement * specifies the terms and conditions for redistribution. */ #ifndef lint char copyright[] = "@(#) Copyright (c) 1980,1986 Regents of the University of California.\n\ All rights reserved.\n"; #endif not lint #ifndef lint static char sccsid[] = "@(#)halt.c 5.4 (Berkeley) 5/26/86"; #endif not lint /* * Halt */ #include #include #include #include #include #include #include #include main(argc, argv) int argc; char **argv; { int howto; char *ttyn = (char *)ttyname(2); register i; register qflag = 0; int needlog = 1; char *user, *getlogin(); struct passwd *pw, *getpwuid(); openlog("halt", 0, LOG_AUTH); howto = RB_HALT; argc--, argv++; while (argc > 0) { if (!strcmp(*argv, "-n")) howto |= RB_NOSYNC; else if (!strcmp(*argv, "-y")) ttyn = 0; else if (!strcmp(*argv, "-q")) qflag++; else if (!strcmp(*argv, "-l")) needlog = 0; else { fprintf(stderr, "usage: halt [ -n ]\n"); exit(1); } argc--, argv++; } if (ttyn && *(ttyn+strlen("/dev/tty")) == 'd') { fprintf(stderr, "halt: dangerous on a dialup; use ``halt -y'' if you are really sure\n"); exit(1); } if (needlog) { user = getlogin(); if (user == (char *)0 && (pw = getpwuid(getuid()))) user = pw->pw_name; if (user == (char *)0) user = "root"; syslog(LOG_CRIT, "halted by %s", user); } signal(SIGHUP, SIG_IGN); /* for network connections */ if (kill(1, SIGTSTP) == -1) { fprintf(stderr, "reboot: can't idle init\n"); exit(1); } sleep(1); (void) kill(-1, SIGTERM); /* one chance to catch it */ sleep(5); if (!qflag) for (i = 1; ; i++) { if (kill(-1, SIGKILL) == -1) { extern int errno; if (errno == ESRCH) break; perror("reboot: kill"); kill(1, SIGHUP); exit(1); } if (i > 5) { fprintf(stderr, "CAUTION: some process(es) wouldn't die\n"); break; } setalarm(2 * i); pause(); } if (!qflag && (howto & RB_NOSYNC) == 0) { markdown(); sync(); setalarm(5); pause(); } syscall(55, howto); perror("reboot"); } dingdong() { /* RRRIIINNNGGG RRRIIINNNGGG */ } setalarm(n) { signal(SIGALRM, dingdong); alarm(n); } #include #define SCPYN(a, b) strncpy(a, b, sizeof(a)) char wtmpf[] = "/usr/adm/wtmp"; struct utmp wtmp; markdown() { register f = open(wtmpf, 1); if (f >= 0) { lseek(f, 0L, 2); SCPYN(wtmp.ut_line, "~"); SCPYN(wtmp.ut_name, "shutdown"); SCPYN(wtmp.ut_host, ""); time(&wtmp.ut_time); write(f, (char *)&wtmp, sizeof(wtmp)); close(f); } }