2 * Copyright (c) 1991, 1993
3 * The Regents of the University of California. All rights reserved.
5 * This code is derived from software contributed to Berkeley by
6 * Donn Seeley at Berkeley Software Design, Inc.
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. All advertising materials mentioning features or use of this software
17 * must display the following acknowledgement:
18 * This product includes software developed by the University of
19 * California, Berkeley and its contributors.
20 * 4. Neither the name of the University nor the names of its contributors
21 * may be used to endorse or promote products derived from this software
22 * without specific prior written permission.
24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
36 * @(#) Copyright (c) 1991, 1993 The Regents of the University of California. All rights reserved.
37 * @(#)init.c 8.1 (Berkeley) 7/15/93
38 * $FreeBSD: src/sbin/init/init.c,v 1.38.2.8 2001/10/22 11:27:32 des Exp $
39 * $DragonFly: src/sbin/init/init.c,v 1.5 2003/12/18 04:12:38 drhodus Exp $
42 #include <sys/param.h>
43 #include <sys/ioctl.h>
44 #include <sys/mount.h>
45 #include <sys/sysctl.h>
62 #include <sys/reboot.h>
76 #include <login_cap.h>
79 #include "pathnames.h"
82 * Sleep times; used to prevent thrashing.
84 #define GETTY_SPACING 5 /* N secs minimum getty spacing */
85 #define GETTY_SLEEP 30 /* sleep N secs after spacing problem */
86 #define GETTY_NSPACE 3 /* max. spacing count to bring reaction */
87 #define WINDOW_WAIT 3 /* wait N secs after starting window */
88 #define STALL_TIMEOUT 30 /* wait N secs after warning */
89 #define DEATH_WATCH 10 /* wait N secs for procs to die */
90 #define DEATH_SCRIPT 120 /* wait for 2min for /etc/rc.shutdown */
91 #define RESOURCE_RC "daemon"
92 #define RESOURCE_WINDOW "default"
93 #define RESOURCE_GETTY "default"
95 void handle(sig_t, ...);
96 void delset(sigset_t *, ...);
98 void stall(char *, ...);
99 void warning(char *, ...);
100 void emergency(char *, ...);
103 int runshutdown(void);
106 * We really need a recursive typedef...
107 * The following at least guarantees that the return type of (*state_t)()
108 * is sufficiently wide to hold a function pointer.
110 typedef long (*state_func_t)(void);
111 typedef state_func_t (*state_t)(void);
113 state_func_t single_user(void);
114 state_func_t runcom(void);
115 state_func_t read_ttys(void);
116 state_func_t multi_user(void);
117 state_func_t clean_ttys(void);
118 state_func_t catatonia(void);
119 state_func_t death(void);
121 enum { AUTOBOOT, FASTBOOT } runcom_mode = AUTOBOOT;
126 int howto = RB_AUTOBOOT;
128 void transition(state_t);
129 state_t requested_transition = runcom;
131 void setctty(char *);
133 typedef struct init_session {
134 int se_index; /* index of entry in ttys file */
135 pid_t se_process; /* controlling process */
136 time_t se_started; /* used to avoid thrashing */
137 int se_flags; /* status of session */
138 #define SE_SHUTDOWN 0x1 /* session won't be restarted */
139 #define SE_PRESENT 0x2 /* session is in /etc/ttys */
140 int se_nspace; /* spacing count */
141 char *se_device; /* filename of port */
142 char *se_getty; /* what to run on that port */
143 char *se_getty_argv_space; /* pre-parsed argument array space */
144 char **se_getty_argv; /* pre-parsed argument array */
145 char *se_window; /* window system (started only once) */
146 char *se_window_argv_space; /* pre-parsed argument array space */
147 char **se_window_argv; /* pre-parsed argument array */
148 char *se_type; /* default terminal type */
149 struct init_session *se_prev;
150 struct init_session *se_next;
153 void free_session(session_t *);
154 session_t *new_session(session_t *, int, struct ttyent *);
157 char **construct_argv(char *);
158 void start_window_system(session_t *);
159 void collect_child(pid_t);
160 pid_t start_getty(session_t *);
161 void transition_handler(int);
162 void alrm_handler(int);
163 void setsecuritylevel(int);
164 int getsecuritylevel(void);
165 int setupargv(session_t *, struct ttyent *);
167 void setprocresources(const char *);
171 void clear_session_logs(session_t *);
173 int start_session_db(void);
174 void add_session(session_t *);
175 void del_session(session_t *);
176 session_t *find_session(pid_t);
180 * The mother of all processes.
183 main(int argc, char **argv)
191 /* Dispose of random users. */
193 errx(1, "%s", strerror(EPERM));
195 /* System V users like to reexec init. */
197 #ifdef COMPAT_SYSV_INIT
198 /* So give them what they want */
200 if (strlen(argv[1]) == 1) {
201 register char runlevel = *argv[1];
205 case '0': /* halt + poweroff */
208 case '1': /* single-user */
211 case '6': /* reboot */
214 case 'c': /* block further logins */
217 case 'q': /* rescan /etc/ttys */
227 errx(1, "invalid run-level ``%s''", argv[1]);
230 errx(1, "already running");
233 * Note that this does NOT open a file...
234 * Does 'init' deserve its own facility number?
236 openlog("init", LOG_CONS|LOG_ODELAY, LOG_AUTH);
239 * Create an initial session.
242 warning("initial setsid() failed: %m");
245 * Establish an initial user so that programs running
246 * single user do not freak out and die (like passwd).
248 if (setlogin("root") < 0)
249 warning("setlogin() failed: %m");
251 if (stat("/dev/null", &sts) < 0) {
252 warning("/dev MAY BE CORRUPT! /dev/null is missing!\n");
257 * This code assumes that we always get arguments through flags,
258 * never through bits set in some random machine register.
260 while ((c = getopt(argc, argv, "dsf")) != -1)
263 /* We don't support DEVFS. */
266 requested_transition = single_user;
269 runcom_mode = FASTBOOT;
272 warning("unrecognized flag '-%c'", c);
277 warning("ignoring excess arguments");
280 * We catch or block signals rather than ignore them,
281 * so that they get reset on exec.
283 handle(badsys, SIGSYS, 0);
284 handle(disaster, SIGABRT, SIGFPE, SIGILL, SIGSEGV,
285 SIGBUS, SIGXCPU, SIGXFSZ, 0);
286 handle(transition_handler, SIGHUP, SIGINT, SIGTERM, SIGTSTP,
287 SIGUSR1, SIGUSR2, 0);
288 handle(alrm_handler, SIGALRM, 0);
290 delset(&mask, SIGABRT, SIGFPE, SIGILL, SIGSEGV, SIGBUS, SIGSYS,
291 SIGXCPU, SIGXFSZ, SIGHUP, SIGINT, SIGTERM, SIGTSTP, SIGALRM,
292 SIGUSR1, SIGUSR2, 0);
293 sigprocmask(SIG_SETMASK, &mask, (sigset_t *) 0);
294 sigemptyset(&sa.sa_mask);
296 sa.sa_handler = SIG_IGN;
297 (void) sigaction(SIGTTIN, &sa, (struct sigaction *)0);
298 (void) sigaction(SIGTTOU, &sa, (struct sigaction *)0);
308 * Start the state machine.
310 transition(requested_transition);
313 * Should never reach here.
319 * Associate a function with a signal handler.
322 handle(sig_t handler, ...)
326 sigset_t mask_everything;
329 va_start(ap, handler);
331 sa.sa_handler = handler;
332 sigfillset(&mask_everything);
334 while ((sig = va_arg(ap, int)) != NULL) {
335 sa.sa_mask = mask_everything;
336 /* XXX SA_RESTART? */
337 sa.sa_flags = sig == SIGCHLD ? SA_NOCLDSTOP : 0;
338 sigaction(sig, &sa, (struct sigaction *) 0);
344 * Delete a set of signals from a mask.
347 delset(sigset_t *maskp, ...)
354 while ((sig = va_arg(ap, int)) != NULL)
355 sigdelset(maskp, sig);
360 * Log a message and sleep for a while (to give someone an opportunity
361 * to read it and to save log or hardcopy output if the problem is chronic).
362 * NB: should send a message to the session logger to avoid blocking.
365 stall(char *message, ...)
369 va_start(ap, message);
371 vsyslog(LOG_ALERT, message, ap);
373 sleep(STALL_TIMEOUT);
377 * Like stall(), but doesn't sleep.
378 * If cpp had variadic macros, the two functions could be #defines for another.
379 * NB: should send a message to the session logger to avoid blocking.
382 warning(char *message, ...)
386 va_start(ap, message);
388 vsyslog(LOG_ALERT, message, ap);
393 * Log an emergency message.
394 * NB: should send a message to the session logger to avoid blocking.
397 emergency(char *message, ...)
401 va_start(ap, message);
403 vsyslog(LOG_EMERG, message, ap);
408 * Catch a SIGSYS signal.
410 * These may arise if a system does not support sysctl.
411 * We tolerate up to 25 of these, then throw in the towel.
416 static int badcount = 0;
424 * Catch an unexpected signal.
429 emergency("fatal signal: %s",
430 (unsigned)sig < NSIG ? sys_siglist[sig] : "unknown signal");
432 sleep(STALL_TIMEOUT);
433 _exit(sig); /* reboot */
437 * Get the security level of the kernel.
440 getsecuritylevel(void)
442 #ifdef KERN_SECURELVL
443 int name[2], curlevel;
447 name[1] = KERN_SECURELVL;
448 len = sizeof curlevel;
449 if (sysctl(name, 2, &curlevel, &len, NULL, 0) == -1) {
450 emergency("cannot get kernel security level: %s",
461 * Set the security level of the kernel.
464 setsecuritylevel(int newlevel)
466 #ifdef KERN_SECURELVL
467 int name[2], curlevel;
469 curlevel = getsecuritylevel();
470 if (newlevel == curlevel)
473 name[1] = KERN_SECURELVL;
474 if (sysctl(name, 2, NULL, NULL, &newlevel, sizeof newlevel) == -1) {
476 "cannot change kernel security level from %d to %d: %s",
477 curlevel, newlevel, strerror(errno));
481 warning("kernel security level changed from %d to %d",
488 * Change states in the finite state machine.
489 * The initial state is passed as an argument.
492 transition(state_t s)
495 s = (state_t) (*s)();
499 * Close out the accounting files for a login session.
500 * NB: should send a message to the session logger to avoid blocking.
503 clear_session_logs(session_t *sp)
505 char *line = sp->se_device + sizeof(_PATH_DEV) - 1;
508 logwtmp(line, "", "");
512 * Start a session and allocate a controlling terminal.
513 * Only called by children of init after forking.
521 if ((fd = open(name, O_RDWR)) == -1) {
522 stall("can't open %s: %m", name);
525 if (login_tty(fd) == -1) {
526 stall("can't get %s for controlling terminal: %m", name);
532 * Bring the system up single user.
540 char *shell = _PATH_BSHELL;
545 static const char banner[] =
546 "Enter root password, or ^D to go multi-user\n";
547 char *clear, *password;
554 /* Instead of going single user, let's reboot the machine */
562 if ((pid = fork()) == 0) {
564 * Start the single user session.
566 setctty(_PATH_CONSOLE);
570 * Check the root password.
571 * We don't care if the console is 'on' by default;
572 * it's the only tty that can be 'off' and 'secure'.
574 typ = getttynam("console");
575 pp = getpwnam("root");
576 if (typ && (typ->ty_status & TTY_SECURE) == 0 &&
577 pp && *pp->pw_passwd) {
578 write(2, banner, sizeof banner - 1);
580 clear = getpass("Password:");
581 if (clear == 0 || *clear == '\0')
583 password = crypt(clear, pp->pw_passwd);
584 bzero(clear, _PASSWORD_LEN);
585 if (strcmp(password, pp->pw_passwd) == 0)
587 warning("single-user login failed\n");
600 "Enter full pathname of shell or RETURN for " _PATH_BSHELL ": "
601 (void)write(STDERR_FILENO,
602 SHREQUEST, sizeof(SHREQUEST) - 1);
603 while ((num = read(STDIN_FILENO, cp, 1)) != -1 &&
604 num != 0 && *cp != '\n' && cp < &altshell[127])
607 if (altshell[0] != '\0')
610 #endif /* DEBUGSHELL */
614 * We catch all the interesting ones,
615 * and those are reset to SIG_DFL on exec.
618 sigprocmask(SIG_SETMASK, &mask, (sigset_t *) 0);
622 * If the default one doesn't work, try the Bourne shell.
627 emergency("can't exec %s for single user: %m", shell);
628 execv(_PATH_BSHELL, argv);
629 emergency("can't exec %s for single user: %m", _PATH_BSHELL);
630 sleep(STALL_TIMEOUT);
636 * We are seriously hosed. Do our best.
638 emergency("can't fork single-user shell, trying again");
639 while (waitpid(-1, (int *) 0, WNOHANG) > 0)
641 return (state_func_t) single_user;
644 requested_transition = 0;
646 if ((wpid = waitpid(-1, &status, WUNTRACED)) != -1)
651 warning("wait for single-user shell failed: %m; restarting");
652 return (state_func_t) single_user;
654 if (wpid == pid && WIFSTOPPED(status)) {
655 warning("init: shell stopped, restarting\n");
659 } while (wpid != pid && !requested_transition);
661 if (requested_transition)
662 return (state_func_t) requested_transition;
664 if (!WIFEXITED(status)) {
665 if (WTERMSIG(status) == SIGKILL) {
667 * reboot(8) killed shell?
669 warning("single user shell terminated.");
670 sleep(STALL_TIMEOUT);
673 warning("single user shell terminated, restarting");
674 return (state_func_t) single_user;
678 runcom_mode = FASTBOOT;
679 return (state_func_t) runcom;
683 * Run the system startup script.
693 if ((pid = fork()) == 0) {
694 sigemptyset(&sa.sa_mask);
696 sa.sa_handler = SIG_IGN;
697 (void) sigaction(SIGTSTP, &sa, (struct sigaction *)0);
698 (void) sigaction(SIGHUP, &sa, (struct sigaction *)0);
700 setctty(_PATH_CONSOLE);
703 argv[1] = _PATH_RUNCOM;
704 argv[2] = runcom_mode == AUTOBOOT ? "autoboot" : 0;
707 sigprocmask(SIG_SETMASK, &sa.sa_mask, (sigset_t *) 0);
710 setprocresources(RESOURCE_RC);
712 execv(_PATH_BSHELL, argv);
713 stall("can't exec %s for %s: %m", _PATH_BSHELL, _PATH_RUNCOM);
714 _exit(1); /* force single user mode */
718 emergency("can't fork for %s on %s: %m",
719 _PATH_BSHELL, _PATH_RUNCOM);
720 while (waitpid(-1, (int *) 0, WNOHANG) > 0)
722 sleep(STALL_TIMEOUT);
723 return (state_func_t) single_user;
727 * Copied from single_user(). This is a bit paranoid.
729 requested_transition = 0;
731 if ((wpid = waitpid(-1, &status, WUNTRACED)) != -1)
734 if (requested_transition == death)
735 return (state_func_t) death;
738 warning("wait for %s on %s failed: %m; going to single user mode",
739 _PATH_BSHELL, _PATH_RUNCOM);
740 return (state_func_t) single_user;
742 if (wpid == pid && WIFSTOPPED(status)) {
743 warning("init: %s on %s stopped, restarting\n",
744 _PATH_BSHELL, _PATH_RUNCOM);
748 } while (wpid != pid);
750 if (WIFSIGNALED(status) && WTERMSIG(status) == SIGTERM &&
751 requested_transition == catatonia) {
752 /* /etc/rc executed /sbin/reboot; wait for the end quietly */
760 if (!WIFEXITED(status)) {
761 warning("%s on %s terminated abnormally, going to single user mode",
762 _PATH_BSHELL, _PATH_RUNCOM);
763 return (state_func_t) single_user;
766 if (WEXITSTATUS(status))
767 return (state_func_t) single_user;
769 runcom_mode = AUTOBOOT; /* the default */
770 /* NB: should send a message to the session logger to avoid blocking. */
771 logwtmp("~", "reboot", "");
772 return (state_func_t) read_ttys;
776 * Open the session database.
778 * NB: We could pass in the size here; is it necessary?
781 start_session_db(void)
783 if (session_db && (*session_db->close)(session_db))
784 emergency("session database close: %s", strerror(errno));
785 if ((session_db = dbopen(NULL, O_RDWR, 0, DB_HASH, NULL)) == 0) {
786 emergency("session database open: %s", strerror(errno));
794 * Add a new login session.
797 add_session(session_t *sp)
802 key.data = &sp->se_process;
803 key.size = sizeof sp->se_process;
805 data.size = sizeof sp;
807 if ((*session_db->put)(session_db, &key, &data, 0))
808 emergency("insert %d: %s", sp->se_process, strerror(errno));
812 * Delete an old login session.
815 del_session(session_t *sp)
819 key.data = &sp->se_process;
820 key.size = sizeof sp->se_process;
822 if ((*session_db->del)(session_db, &key, 0))
823 emergency("delete %d: %s", sp->se_process, strerror(errno));
827 * Look up a login session by pid.
830 find_session(pid_t pid)
837 key.size = sizeof pid;
838 if ((*session_db->get)(session_db, &key, &data, 0) != 0)
840 bcopy(data.data, (char *)&ret, sizeof(ret));
845 * Construct an argument vector from a command line.
848 construct_argv(char *command)
851 register int argc = 0;
852 register char **argv = (char **) malloc(((strlen(command) + 1) / 2 + 1)
855 if ((argv[argc++] = strk(command)) == 0) {
859 while ((argv[argc++] = strk((char *) 0)) != NULL)
865 * Deallocate a session descriptor.
868 free_session(register session_t *sp)
873 free(sp->se_getty_argv_space);
874 free(sp->se_getty_argv);
878 free(sp->se_window_argv_space);
879 free(sp->se_window_argv);
887 * Allocate a new session descriptor.
888 * Mark it SE_PRESENT.
891 new_session(session_t *sprev, int session_index, register struct ttyent *typ)
893 register session_t *sp;
896 if ((typ->ty_status & TTY_ON) == 0 ||
901 sp = (session_t *) calloc(1, sizeof (session_t));
903 sp->se_index = session_index;
904 sp->se_flags |= SE_PRESENT;
906 sp->se_device = malloc(sizeof(_PATH_DEV) + strlen(typ->ty_name));
907 (void) sprintf(sp->se_device, "%s%s", _PATH_DEV, typ->ty_name);
910 * Attempt to open the device, if we get "device not configured"
911 * then don't add the device to the session list.
913 if ((fd = open(sp->se_device, O_RDONLY | O_NONBLOCK, 0)) < 0) {
914 if (errno == ENXIO) {
921 if (setupargv(sp, typ) == 0) {
939 * Calculate getty and if useful window argv vectors.
942 setupargv(session_t *sp, struct ttyent *typ)
947 free(sp->se_getty_argv_space);
948 free(sp->se_getty_argv);
950 sp->se_getty = malloc(strlen(typ->ty_getty) + strlen(typ->ty_name) + 2);
951 (void) sprintf(sp->se_getty, "%s %s", typ->ty_getty, typ->ty_name);
952 sp->se_getty_argv_space = strdup(sp->se_getty);
953 sp->se_getty_argv = construct_argv(sp->se_getty_argv_space);
954 if (sp->se_getty_argv == 0) {
955 warning("can't parse getty for port %s", sp->se_device);
957 free(sp->se_getty_argv_space);
958 sp->se_getty = sp->se_getty_argv_space = 0;
963 free(sp->se_window_argv_space);
964 free(sp->se_window_argv);
966 sp->se_window = sp->se_window_argv_space = 0;
967 sp->se_window_argv = 0;
968 if (typ->ty_window) {
969 sp->se_window = strdup(typ->ty_window);
970 sp->se_window_argv_space = strdup(sp->se_window);
971 sp->se_window_argv = construct_argv(sp->se_window_argv_space);
972 if (sp->se_window_argv == 0) {
973 warning("can't parse window for port %s",
975 free(sp->se_window_argv_space);
977 sp->se_window = sp->se_window_argv_space = 0;
983 sp->se_type = typ->ty_type ? strdup(typ->ty_type) : 0;
988 * Walk the list of ttys and create sessions for each active line.
993 int session_index = 0;
994 register session_t *sp, *snext;
995 register struct ttyent *typ;
998 * Destroy any previous session state.
999 * There shouldn't be any, but just in case...
1001 for (sp = sessions; sp; sp = snext) {
1003 clear_session_logs(sp);
1004 snext = sp->se_next;
1008 if (start_session_db())
1009 return (state_func_t) single_user;
1012 * Allocate a session entry for each active port.
1013 * Note that sp starts at 0.
1015 while ((typ = getttyent()) != NULL)
1016 if ((snext = new_session(sp, ++session_index, typ)) != NULL)
1021 return (state_func_t) multi_user;
1025 * Start a window system running.
1028 start_window_system(session_t *sp)
1032 char term[64], *env[2];
1034 if ((pid = fork()) == -1) {
1035 emergency("can't fork for window system on port %s: %m",
1037 /* hope that getty fails and we can try again */
1045 sigprocmask(SIG_SETMASK, &mask, (sigset_t *) 0);
1048 emergency("setsid failed (window) %m");
1051 setprocresources(RESOURCE_WINDOW);
1054 /* Don't use malloc after fork */
1055 strcpy(term, "TERM=");
1056 strncat(term, sp->se_type, sizeof(term) - 6);
1062 execve(sp->se_window_argv[0], sp->se_window_argv, env);
1063 stall("can't exec window system '%s' for port %s: %m",
1064 sp->se_window_argv[0], sp->se_device);
1069 * Start a login session running.
1072 start_getty(session_t *sp)
1076 time_t current_time = time((time_t *) 0);
1078 char term[64], *env[2];
1080 if (current_time >= sp->se_started &&
1081 current_time - sp->se_started < GETTY_SPACING) {
1082 if (++sp->se_nspace > GETTY_NSPACE) {
1090 * fork(), not vfork() -- we can't afford to block.
1092 if ((pid = fork()) == -1) {
1093 emergency("can't fork for getty on port %s: %m", sp->se_device);
1101 warning("getty repeating too quickly on port %s, sleeping %d secs",
1102 sp->se_device, GETTY_SLEEP);
1103 sleep((unsigned) GETTY_SLEEP);
1106 if (sp->se_window) {
1107 start_window_system(sp);
1112 sigprocmask(SIG_SETMASK, &mask, (sigset_t *) 0);
1115 setprocresources(RESOURCE_GETTY);
1118 /* Don't use malloc after fork */
1119 strcpy(term, "TERM=");
1120 strncat(term, sp->se_type, sizeof(term) - 6);
1126 execve(sp->se_getty_argv[0], sp->se_getty_argv, env);
1127 stall("can't exec getty '%s' for port %s: %m",
1128 sp->se_getty_argv[0], sp->se_device);
1133 * Collect exit status for a child.
1134 * If an exiting login, start a new login running.
1137 collect_child(pid_t pid)
1139 register session_t *sp, *sprev, *snext;
1144 if (! (sp = find_session(pid)))
1147 clear_session_logs(sp);
1151 if (sp->se_flags & SE_SHUTDOWN) {
1152 if ((sprev = sp->se_prev) != NULL)
1153 sprev->se_next = sp->se_next;
1155 sessions = sp->se_next;
1156 if ((snext = sp->se_next) != NULL)
1157 snext->se_prev = sp->se_prev;
1162 if ((pid = start_getty(sp)) == -1) {
1163 /* serious trouble */
1164 requested_transition = clean_ttys;
1168 sp->se_process = pid;
1169 sp->se_started = time((time_t *) 0);
1174 * Catch a signal and request a state transition.
1177 transition_handler(int sig)
1182 requested_transition = clean_ttys;
1185 howto = RB_POWEROFF;
1191 requested_transition = death;
1194 requested_transition = catatonia;
1197 requested_transition = 0;
1203 * Take the system multiuser.
1209 register session_t *sp;
1211 requested_transition = 0;
1214 * If the administrator has not set the security level to -1
1215 * to indicate that the kernel should not run multiuser in secure
1216 * mode, and the run script has not set a higher level of security
1217 * than level 1, then put the kernel into secure mode.
1219 if (getsecuritylevel() == 0)
1220 setsecuritylevel(1);
1222 for (sp = sessions; sp; sp = sp->se_next) {
1225 if ((pid = start_getty(sp)) == -1) {
1226 /* serious trouble */
1227 requested_transition = clean_ttys;
1230 sp->se_process = pid;
1231 sp->se_started = time((time_t *) 0);
1235 while (!requested_transition)
1236 if ((pid = waitpid(-1, (int *) 0, 0)) != -1)
1239 return (state_func_t) requested_transition;
1243 * This is an (n*2)+(n^2) algorithm. We hope it isn't run often...
1248 register session_t *sp, *sprev;
1249 register struct ttyent *typ;
1250 register int session_index = 0;
1251 register int devlen;
1252 char *old_getty, *old_window, *old_type;
1255 return (state_func_t) multi_user;
1258 * mark all sessions for death, (!SE_PRESENT)
1259 * as we find or create new ones they'll be marked as keepers,
1260 * we'll later nuke all the ones not found in /etc/ttys
1262 for (sp = sessions; sp != NULL; sp = sp->se_next)
1263 sp->se_flags &= ~SE_PRESENT;
1265 devlen = sizeof(_PATH_DEV) - 1;
1266 while ((typ = getttyent()) != NULL) {
1269 for (sprev = 0, sp = sessions; sp; sprev = sp, sp = sp->se_next)
1270 if (strcmp(typ->ty_name, sp->se_device + devlen) == 0)
1274 /* we want this one to live */
1275 sp->se_flags |= SE_PRESENT;
1276 if (sp->se_index != session_index) {
1277 warning("port %s changed utmp index from %d to %d",
1278 sp->se_device, sp->se_index,
1280 sp->se_index = session_index;
1282 if ((typ->ty_status & TTY_ON) == 0 ||
1283 typ->ty_getty == 0) {
1284 sp->se_flags |= SE_SHUTDOWN;
1285 kill(sp->se_process, SIGHUP);
1288 sp->se_flags &= ~SE_SHUTDOWN;
1289 old_getty = sp->se_getty ? strdup(sp->se_getty) : 0;
1290 old_window = sp->se_window ? strdup(sp->se_window) : 0;
1291 old_type = sp->se_type ? strdup(sp->se_type) : 0;
1292 if (setupargv(sp, typ) == 0) {
1293 warning("can't parse getty for port %s",
1295 sp->se_flags |= SE_SHUTDOWN;
1296 kill(sp->se_process, SIGHUP);
1298 else if ( !old_getty
1299 || (!old_type && sp->se_type)
1300 || (old_type && !sp->se_type)
1301 || (!old_window && sp->se_window)
1302 || (old_window && !sp->se_window)
1303 || (strcmp(old_getty, sp->se_getty) != 0)
1304 || (old_window && strcmp(old_window, sp->se_window) != 0)
1305 || (old_type && strcmp(old_type, sp->se_type) != 0)
1307 /* Don't set SE_SHUTDOWN here */
1310 kill(sp->se_process, SIGHUP);
1321 new_session(sprev, session_index, typ);
1327 * sweep through and kill all deleted sessions
1328 * ones who's /etc/ttys line was deleted (SE_PRESENT unset)
1330 for (sp = sessions; sp != NULL; sp = sp->se_next) {
1331 if ((sp->se_flags & SE_PRESENT) == 0) {
1332 sp->se_flags |= SE_SHUTDOWN;
1333 kill(sp->se_process, SIGHUP);
1337 return (state_func_t) multi_user;
1341 * Block further logins.
1346 register session_t *sp;
1348 for (sp = sessions; sp; sp = sp->se_next)
1349 sp->se_flags |= SE_SHUTDOWN;
1351 return (state_func_t) multi_user;
1358 alrm_handler(int sig)
1365 * Bring the system down to single user.
1370 register session_t *sp;
1373 static const int death_sigs[2] = { SIGTERM, SIGKILL };
1375 /* NB: should send a message to the session logger to avoid blocking. */
1376 logwtmp("~", "shutdown", "");
1378 for (sp = sessions; sp; sp = sp->se_next) {
1379 sp->se_flags |= SE_SHUTDOWN;
1380 kill(sp->se_process, SIGHUP);
1383 /* Try to run the rc.shutdown script within a period of time */
1384 (void) runshutdown();
1386 for (i = 0; i < 2; ++i) {
1387 if (kill(-1, death_sigs[i]) == -1 && errno == ESRCH)
1388 return (state_func_t) single_user;
1393 if ((pid = waitpid(-1, (int *)0, 0)) != -1)
1395 while (clang == 0 && errno != ECHILD);
1397 if (errno == ECHILD)
1398 return (state_func_t) single_user;
1401 warning("some processes would not die; ps axl advised");
1403 return (state_func_t) single_user;
1407 * Run the system shutdown script.
1409 * Exit codes: XXX I should document more
1410 * -2 shutdown script terminated abnormally
1411 * -1 fatal error - can't run script
1413 * >0 some error (exit code)
1420 int shutdowntimeout;
1423 struct sigaction sa;
1427 * rc.shutdown is optional, so to prevent any unnecessary
1428 * complaints from the shell we simply don't run it if the
1429 * file does not exist. If the stat() here fails for other
1430 * reasons, we'll let the shell complain.
1432 if (stat(_PATH_RUNDOWN, &sb) == -1 && errno == ENOENT)
1435 if ((pid = fork()) == 0) {
1438 /* Assume that init already grab console as ctty before */
1440 sigemptyset(&sa.sa_mask);
1442 sa.sa_handler = SIG_IGN;
1443 (void) sigaction(SIGTSTP, &sa, (struct sigaction *)0);
1444 (void) sigaction(SIGHUP, &sa, (struct sigaction *)0);
1446 if ((fd = open(_PATH_CONSOLE, O_RDWR)) == -1)
1447 warning("can't open %s: %m", _PATH_CONSOLE);
1457 * Run the shutdown script.
1460 argv[1] = _PATH_RUNDOWN;
1467 sigprocmask(SIG_SETMASK, &sa.sa_mask, (sigset_t *) 0);
1470 setprocresources(RESOURCE_RC);
1472 execv(_PATH_BSHELL, argv);
1473 warning("can't exec %s for %s: %m", _PATH_BSHELL, _PATH_RUNDOWN);
1474 _exit(1); /* force single user mode */
1478 emergency("can't fork for %s on %s: %m",
1479 _PATH_BSHELL, _PATH_RUNDOWN);
1480 while (waitpid(-1, (int *) 0, WNOHANG) > 0)
1482 sleep(STALL_TIMEOUT);
1486 len = sizeof(shutdowntimeout);
1487 if (sysctlbyname("kern.shutdown_timeout",
1489 &len, NULL, 0) == -1 || shutdowntimeout < 2)
1490 shutdowntimeout = DEATH_SCRIPT;
1491 alarm(shutdowntimeout);
1494 * Copied from single_user(). This is a bit paranoid.
1495 * Use the same ALRM handler.
1498 if ((wpid = waitpid(-1, &status, WUNTRACED)) != -1)
1499 collect_child(wpid);
1501 /* we were waiting for the sub-shell */
1502 kill(wpid, SIGTERM);
1503 warning("timeout expired for %s on %s: %m; going to single user mode",
1504 _PATH_BSHELL, _PATH_RUNDOWN);
1510 warning("wait for %s on %s failed: %m; going to single user mode",
1511 _PATH_BSHELL, _PATH_RUNDOWN);
1514 if (wpid == pid && WIFSTOPPED(status)) {
1515 warning("init: %s on %s stopped, restarting\n",
1516 _PATH_BSHELL, _PATH_RUNDOWN);
1520 } while (wpid != pid && !clang);
1522 /* Turn off the alarm */
1525 if (WIFSIGNALED(status) && WTERMSIG(status) == SIGTERM &&
1526 requested_transition == catatonia) {
1528 * /etc/rc.shutdown executed /sbin/reboot;
1529 * wait for the end quietly
1538 if (!WIFEXITED(status)) {
1539 warning("%s on %s terminated abnormally, going to single user mode",
1540 _PATH_BSHELL, _PATH_RUNDOWN);
1544 if ((status = WEXITSTATUS(status)) != 0)
1545 warning("%s returned status %d", _PATH_RUNDOWN, status);
1563 while (c == ' ' || c == '\t' )
1573 while (c && c != '\'')
1575 if (!c) /* unterminated string */
1580 while (c && c != ' ' && c != '\t' )
1591 setprocresources(const char *cname)
1594 if ((lc = login_getclassbyname(cname, NULL)) != NULL) {
1595 setusercontext(lc, (struct passwd*)NULL, 0, LOGIN_SETPRIORITY|LOGIN_SETRESOURCES);