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 1.2 2003/06/17 04:27:33 dillon 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 __P((sig_t, ...));
96 void delset __P((sigset_t *, ...));
98 void stall __P((char *, ...));
99 void warning __P((char *, ...));
100 void emergency __P((char *, ...));
101 void disaster __P((int));
102 void badsys __P((int));
103 int runshutdown __P((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) __P((void));
111 typedef state_func_t (*state_t) __P((void));
113 state_func_t single_user __P((void));
114 state_func_t runcom __P((void));
115 state_func_t read_ttys __P((void));
116 state_func_t multi_user __P((void));
117 state_func_t clean_ttys __P((void));
118 state_func_t catatonia __P((void));
119 state_func_t death __P((void));
121 enum { AUTOBOOT, FASTBOOT } runcom_mode = AUTOBOOT;
126 int howto = RB_AUTOBOOT;
128 void transition __P((state_t));
129 state_t requested_transition = runcom;
131 void setctty __P((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 __P((session_t *));
154 session_t *new_session __P((session_t *, int, struct ttyent *));
157 char **construct_argv __P((char *));
158 void start_window_system __P((session_t *));
159 void collect_child __P((pid_t));
160 pid_t start_getty __P((session_t *));
161 void transition_handler __P((int));
162 void alrm_handler __P((int));
163 void setsecuritylevel __P((int));
164 int getsecuritylevel __P((void));
165 int setupargv __P((session_t *, struct ttyent *));
167 void setprocresources __P((const char *));
171 void clear_session_logs __P((session_t *));
173 int start_session_db __P((void));
174 void add_session __P((session_t *));
175 void del_session __P((session_t *));
176 session_t *find_session __P((pid_t));
180 * The mother of all processes.
192 /* Dispose of random users. */
194 errx(1, "%s", strerror(EPERM));
196 /* System V users like to reexec init. */
198 #ifdef COMPAT_SYSV_INIT
199 /* So give them what they want */
201 if (strlen(argv[1]) == 1) {
202 register char runlevel = *argv[1];
206 case '0': /* halt + poweroff */
209 case '1': /* single-user */
212 case '6': /* reboot */
215 case 'c': /* block further logins */
218 case 'q': /* rescan /etc/ttys */
228 errx(1, "invalid run-level ``%s''", argv[1]);
231 errx(1, "already running");
234 * Note that this does NOT open a file...
235 * Does 'init' deserve its own facility number?
237 openlog("init", LOG_CONS|LOG_ODELAY, LOG_AUTH);
240 * Create an initial session.
243 warning("initial setsid() failed: %m");
246 * Establish an initial user so that programs running
247 * single user do not freak out and die (like passwd).
249 if (setlogin("root") < 0)
250 warning("setlogin() failed: %m");
253 * This code assumes that we always get arguments through flags,
254 * never through bits set in some random machine register.
256 while ((c = getopt(argc, argv, "dsf")) != -1)
259 /* We don't support DEVFS. */
262 requested_transition = single_user;
265 runcom_mode = FASTBOOT;
268 warning("unrecognized flag '-%c'", c);
273 warning("ignoring excess arguments");
276 * We catch or block signals rather than ignore them,
277 * so that they get reset on exec.
279 handle(badsys, SIGSYS, 0);
280 handle(disaster, SIGABRT, SIGFPE, SIGILL, SIGSEGV,
281 SIGBUS, SIGXCPU, SIGXFSZ, 0);
282 handle(transition_handler, SIGHUP, SIGINT, SIGTERM, SIGTSTP,
283 SIGUSR1, SIGUSR2, 0);
284 handle(alrm_handler, SIGALRM, 0);
286 delset(&mask, SIGABRT, SIGFPE, SIGILL, SIGSEGV, SIGBUS, SIGSYS,
287 SIGXCPU, SIGXFSZ, SIGHUP, SIGINT, SIGTERM, SIGTSTP, SIGALRM,
288 SIGUSR1, SIGUSR2, 0);
289 sigprocmask(SIG_SETMASK, &mask, (sigset_t *) 0);
290 sigemptyset(&sa.sa_mask);
292 sa.sa_handler = SIG_IGN;
293 (void) sigaction(SIGTTIN, &sa, (struct sigaction *)0);
294 (void) sigaction(SIGTTOU, &sa, (struct sigaction *)0);
304 * Start the state machine.
306 transition(requested_transition);
309 * Should never reach here.
315 * Associate a function with a signal handler.
319 handle(sig_t handler, ...)
327 sigset_t mask_everything;
333 handler = va_arg(ap, sig_t);
335 va_start(ap, handler);
338 sa.sa_handler = handler;
339 sigfillset(&mask_everything);
341 while ((sig = va_arg(ap, int)) != NULL) {
342 sa.sa_mask = mask_everything;
343 /* XXX SA_RESTART? */
344 sa.sa_flags = sig == SIGCHLD ? SA_NOCLDSTOP : 0;
345 sigaction(sig, &sa, (struct sigaction *) 0);
351 * Delete a set of signals from a mask.
355 delset(sigset_t *maskp, ...)
367 maskp = va_arg(ap, sigset_t *);
372 while ((sig = va_arg(ap, int)) != NULL)
373 sigdelset(maskp, sig);
378 * Log a message and sleep for a while (to give someone an opportunity
379 * to read it and to save log or hardcopy output if the problem is chronic).
380 * NB: should send a message to the session logger to avoid blocking.
384 stall(char *message, ...)
395 message = va_arg(ap, char *);
397 va_start(ap, message);
400 vsyslog(LOG_ALERT, message, ap);
402 sleep(STALL_TIMEOUT);
406 * Like stall(), but doesn't sleep.
407 * If cpp had variadic macros, the two functions could be #defines for another.
408 * NB: should send a message to the session logger to avoid blocking.
412 warning(char *message, ...)
423 message = va_arg(ap, char *);
425 va_start(ap, message);
428 vsyslog(LOG_ALERT, message, ap);
433 * Log an emergency message.
434 * NB: should send a message to the session logger to avoid blocking.
438 emergency(char *message, ...)
449 message = va_arg(ap, char *);
451 va_start(ap, message);
454 vsyslog(LOG_EMERG, message, ap);
459 * Catch a SIGSYS signal.
461 * These may arise if a system does not support sysctl.
462 * We tolerate up to 25 of these, then throw in the towel.
468 static int badcount = 0;
476 * Catch an unexpected signal.
482 emergency("fatal signal: %s",
483 (unsigned)sig < NSIG ? sys_siglist[sig] : "unknown signal");
485 sleep(STALL_TIMEOUT);
486 _exit(sig); /* reboot */
490 * Get the security level of the kernel.
495 #ifdef KERN_SECURELVL
496 int name[2], curlevel;
500 name[1] = KERN_SECURELVL;
501 len = sizeof curlevel;
502 if (sysctl(name, 2, &curlevel, &len, NULL, 0) == -1) {
503 emergency("cannot get kernel security level: %s",
514 * Set the security level of the kernel.
517 setsecuritylevel(newlevel)
520 #ifdef KERN_SECURELVL
521 int name[2], curlevel;
523 curlevel = getsecuritylevel();
524 if (newlevel == curlevel)
527 name[1] = KERN_SECURELVL;
528 if (sysctl(name, 2, NULL, NULL, &newlevel, sizeof newlevel) == -1) {
530 "cannot change kernel security level from %d to %d: %s",
531 curlevel, newlevel, strerror(errno));
535 warning("kernel security level changed from %d to %d",
542 * Change states in the finite state machine.
543 * The initial state is passed as an argument.
550 s = (state_t) (*s)();
554 * Close out the accounting files for a login session.
555 * NB: should send a message to the session logger to avoid blocking.
558 clear_session_logs(sp)
561 char *line = sp->se_device + sizeof(_PATH_DEV) - 1;
564 logwtmp(line, "", "");
568 * Start a session and allocate a controlling terminal.
569 * Only called by children of init after forking.
578 if ((fd = open(name, O_RDWR)) == -1) {
579 stall("can't open %s: %m", name);
582 if (login_tty(fd) == -1) {
583 stall("can't get %s for controlling terminal: %m", name);
589 * Bring the system up single user.
597 char *shell = _PATH_BSHELL;
602 static const char banner[] =
603 "Enter root password, or ^D to go multi-user\n";
604 char *clear, *password;
611 /* Instead of going single user, let's reboot the machine */
619 if ((pid = fork()) == 0) {
621 * Start the single user session.
623 setctty(_PATH_CONSOLE);
627 * Check the root password.
628 * We don't care if the console is 'on' by default;
629 * it's the only tty that can be 'off' and 'secure'.
631 typ = getttynam("console");
632 pp = getpwnam("root");
633 if (typ && (typ->ty_status & TTY_SECURE) == 0 &&
634 pp && *pp->pw_passwd) {
635 write(2, banner, sizeof banner - 1);
637 clear = getpass("Password:");
638 if (clear == 0 || *clear == '\0')
640 password = crypt(clear, pp->pw_passwd);
641 bzero(clear, _PASSWORD_LEN);
642 if (strcmp(password, pp->pw_passwd) == 0)
644 warning("single-user login failed\n");
657 "Enter full pathname of shell or RETURN for " _PATH_BSHELL ": "
658 (void)write(STDERR_FILENO,
659 SHREQUEST, sizeof(SHREQUEST) - 1);
660 while ((num = read(STDIN_FILENO, cp, 1)) != -1 &&
661 num != 0 && *cp != '\n' && cp < &altshell[127])
664 if (altshell[0] != '\0')
667 #endif /* DEBUGSHELL */
671 * We catch all the interesting ones,
672 * and those are reset to SIG_DFL on exec.
675 sigprocmask(SIG_SETMASK, &mask, (sigset_t *) 0);
679 * If the default one doesn't work, try the Bourne shell.
684 emergency("can't exec %s for single user: %m", shell);
685 execv(_PATH_BSHELL, argv);
686 emergency("can't exec %s for single user: %m", _PATH_BSHELL);
687 sleep(STALL_TIMEOUT);
693 * We are seriously hosed. Do our best.
695 emergency("can't fork single-user shell, trying again");
696 while (waitpid(-1, (int *) 0, WNOHANG) > 0)
698 return (state_func_t) single_user;
701 requested_transition = 0;
703 if ((wpid = waitpid(-1, &status, WUNTRACED)) != -1)
708 warning("wait for single-user shell failed: %m; restarting");
709 return (state_func_t) single_user;
711 if (wpid == pid && WIFSTOPPED(status)) {
712 warning("init: shell stopped, restarting\n");
716 } while (wpid != pid && !requested_transition);
718 if (requested_transition)
719 return (state_func_t) requested_transition;
721 if (!WIFEXITED(status)) {
722 if (WTERMSIG(status) == SIGKILL) {
724 * reboot(8) killed shell?
726 warning("single user shell terminated.");
727 sleep(STALL_TIMEOUT);
730 warning("single user shell terminated, restarting");
731 return (state_func_t) single_user;
735 runcom_mode = FASTBOOT;
736 return (state_func_t) runcom;
740 * Run the system startup script.
750 if ((pid = fork()) == 0) {
751 sigemptyset(&sa.sa_mask);
753 sa.sa_handler = SIG_IGN;
754 (void) sigaction(SIGTSTP, &sa, (struct sigaction *)0);
755 (void) sigaction(SIGHUP, &sa, (struct sigaction *)0);
757 setctty(_PATH_CONSOLE);
760 argv[1] = _PATH_RUNCOM;
761 argv[2] = runcom_mode == AUTOBOOT ? "autoboot" : 0;
764 sigprocmask(SIG_SETMASK, &sa.sa_mask, (sigset_t *) 0);
767 setprocresources(RESOURCE_RC);
769 execv(_PATH_BSHELL, argv);
770 stall("can't exec %s for %s: %m", _PATH_BSHELL, _PATH_RUNCOM);
771 _exit(1); /* force single user mode */
775 emergency("can't fork for %s on %s: %m",
776 _PATH_BSHELL, _PATH_RUNCOM);
777 while (waitpid(-1, (int *) 0, WNOHANG) > 0)
779 sleep(STALL_TIMEOUT);
780 return (state_func_t) single_user;
784 * Copied from single_user(). This is a bit paranoid.
786 requested_transition = 0;
788 if ((wpid = waitpid(-1, &status, WUNTRACED)) != -1)
791 if (requested_transition == death)
792 return (state_func_t) death;
795 warning("wait for %s on %s failed: %m; going to single user mode",
796 _PATH_BSHELL, _PATH_RUNCOM);
797 return (state_func_t) single_user;
799 if (wpid == pid && WIFSTOPPED(status)) {
800 warning("init: %s on %s stopped, restarting\n",
801 _PATH_BSHELL, _PATH_RUNCOM);
805 } while (wpid != pid);
807 if (WIFSIGNALED(status) && WTERMSIG(status) == SIGTERM &&
808 requested_transition == catatonia) {
809 /* /etc/rc executed /sbin/reboot; wait for the end quietly */
817 if (!WIFEXITED(status)) {
818 warning("%s on %s terminated abnormally, going to single user mode",
819 _PATH_BSHELL, _PATH_RUNCOM);
820 return (state_func_t) single_user;
823 if (WEXITSTATUS(status))
824 return (state_func_t) single_user;
826 runcom_mode = AUTOBOOT; /* the default */
827 /* NB: should send a message to the session logger to avoid blocking. */
828 logwtmp("~", "reboot", "");
829 return (state_func_t) read_ttys;
833 * Open the session database.
835 * NB: We could pass in the size here; is it necessary?
840 if (session_db && (*session_db->close)(session_db))
841 emergency("session database close: %s", strerror(errno));
842 if ((session_db = dbopen(NULL, O_RDWR, 0, DB_HASH, NULL)) == 0) {
843 emergency("session database open: %s", strerror(errno));
851 * Add a new login session.
860 key.data = &sp->se_process;
861 key.size = sizeof sp->se_process;
863 data.size = sizeof sp;
865 if ((*session_db->put)(session_db, &key, &data, 0))
866 emergency("insert %d: %s", sp->se_process, strerror(errno));
870 * Delete an old login session.
878 key.data = &sp->se_process;
879 key.size = sizeof sp->se_process;
881 if ((*session_db->del)(session_db, &key, 0))
882 emergency("delete %d: %s", sp->se_process, strerror(errno));
886 * Look up a login session by pid.
890 find_session(pid_t pid)
901 key.size = sizeof pid;
902 if ((*session_db->get)(session_db, &key, &data, 0) != 0)
904 bcopy(data.data, (char *)&ret, sizeof(ret));
909 * Construct an argument vector from a command line.
912 construct_argv(command)
916 register int argc = 0;
917 register char **argv = (char **) malloc(((strlen(command) + 1) / 2 + 1)
920 if ((argv[argc++] = strk(command)) == 0) {
924 while ((argv[argc++] = strk((char *) 0)) != NULL)
930 * Deallocate a session descriptor.
934 register session_t *sp;
939 free(sp->se_getty_argv_space);
940 free(sp->se_getty_argv);
944 free(sp->se_window_argv_space);
945 free(sp->se_window_argv);
953 * Allocate a new session descriptor.
954 * Mark it SE_PRESENT.
957 new_session(sprev, session_index, typ)
960 register struct ttyent *typ;
962 register session_t *sp;
965 if ((typ->ty_status & TTY_ON) == 0 ||
970 sp = (session_t *) calloc(1, sizeof (session_t));
972 sp->se_index = session_index;
973 sp->se_flags |= SE_PRESENT;
975 sp->se_device = malloc(sizeof(_PATH_DEV) + strlen(typ->ty_name));
976 (void) sprintf(sp->se_device, "%s%s", _PATH_DEV, typ->ty_name);
979 * Attempt to open the device, if we get "device not configured"
980 * then don't add the device to the session list.
982 if ((fd = open(sp->se_device, O_RDONLY | O_NONBLOCK, 0)) < 0) {
983 if (errno == ENXIO) {
990 if (setupargv(sp, typ) == 0) {
1000 sprev->se_next = sp;
1001 sp->se_prev = sprev;
1008 * Calculate getty and if useful window argv vectors.
1018 free(sp->se_getty_argv_space);
1019 free(sp->se_getty_argv);
1021 sp->se_getty = malloc(strlen(typ->ty_getty) + strlen(typ->ty_name) + 2);
1022 (void) sprintf(sp->se_getty, "%s %s", typ->ty_getty, typ->ty_name);
1023 sp->se_getty_argv_space = strdup(sp->se_getty);
1024 sp->se_getty_argv = construct_argv(sp->se_getty_argv_space);
1025 if (sp->se_getty_argv == 0) {
1026 warning("can't parse getty for port %s", sp->se_device);
1028 free(sp->se_getty_argv_space);
1029 sp->se_getty = sp->se_getty_argv_space = 0;
1032 if (sp->se_window) {
1033 free(sp->se_window);
1034 free(sp->se_window_argv_space);
1035 free(sp->se_window_argv);
1037 sp->se_window = sp->se_window_argv_space = 0;
1038 sp->se_window_argv = 0;
1039 if (typ->ty_window) {
1040 sp->se_window = strdup(typ->ty_window);
1041 sp->se_window_argv_space = strdup(sp->se_window);
1042 sp->se_window_argv = construct_argv(sp->se_window_argv_space);
1043 if (sp->se_window_argv == 0) {
1044 warning("can't parse window for port %s",
1046 free(sp->se_window_argv_space);
1047 free(sp->se_window);
1048 sp->se_window = sp->se_window_argv_space = 0;
1054 sp->se_type = typ->ty_type ? strdup(typ->ty_type) : 0;
1059 * Walk the list of ttys and create sessions for each active line.
1064 int session_index = 0;
1065 register session_t *sp, *snext;
1066 register struct ttyent *typ;
1069 * Destroy any previous session state.
1070 * There shouldn't be any, but just in case...
1072 for (sp = sessions; sp; sp = snext) {
1074 clear_session_logs(sp);
1075 snext = sp->se_next;
1079 if (start_session_db())
1080 return (state_func_t) single_user;
1083 * Allocate a session entry for each active port.
1084 * Note that sp starts at 0.
1086 while ((typ = getttyent()) != NULL)
1087 if ((snext = new_session(sp, ++session_index, typ)) != NULL)
1092 return (state_func_t) multi_user;
1096 * Start a window system running.
1099 start_window_system(sp)
1104 char term[64], *env[2];
1106 if ((pid = fork()) == -1) {
1107 emergency("can't fork for window system on port %s: %m",
1109 /* hope that getty fails and we can try again */
1117 sigprocmask(SIG_SETMASK, &mask, (sigset_t *) 0);
1120 emergency("setsid failed (window) %m");
1123 setprocresources(RESOURCE_WINDOW);
1126 /* Don't use malloc after fork */
1127 strcpy(term, "TERM=");
1128 strncat(term, sp->se_type, sizeof(term) - 6);
1134 execve(sp->se_window_argv[0], sp->se_window_argv, env);
1135 stall("can't exec window system '%s' for port %s: %m",
1136 sp->se_window_argv[0], sp->se_device);
1141 * Start a login session running.
1149 time_t current_time = time((time_t *) 0);
1151 char term[64], *env[2];
1153 if (current_time >= sp->se_started &&
1154 current_time - sp->se_started < GETTY_SPACING) {
1155 if (++sp->se_nspace > GETTY_NSPACE) {
1163 * fork(), not vfork() -- we can't afford to block.
1165 if ((pid = fork()) == -1) {
1166 emergency("can't fork for getty on port %s: %m", sp->se_device);
1174 warning("getty repeating too quickly on port %s, sleeping %d secs",
1175 sp->se_device, GETTY_SLEEP);
1176 sleep((unsigned) GETTY_SLEEP);
1179 if (sp->se_window) {
1180 start_window_system(sp);
1185 sigprocmask(SIG_SETMASK, &mask, (sigset_t *) 0);
1188 setprocresources(RESOURCE_GETTY);
1191 /* Don't use malloc after fork */
1192 strcpy(term, "TERM=");
1193 strncat(term, sp->se_type, sizeof(term) - 6);
1199 execve(sp->se_getty_argv[0], sp->se_getty_argv, env);
1200 stall("can't exec getty '%s' for port %s: %m",
1201 sp->se_getty_argv[0], sp->se_device);
1206 * Collect exit status for a child.
1207 * If an exiting login, start a new login running.
1211 collect_child(pid_t pid)
1217 register session_t *sp, *sprev, *snext;
1222 if (! (sp = find_session(pid)))
1225 clear_session_logs(sp);
1229 if (sp->se_flags & SE_SHUTDOWN) {
1230 if ((sprev = sp->se_prev) != NULL)
1231 sprev->se_next = sp->se_next;
1233 sessions = sp->se_next;
1234 if ((snext = sp->se_next) != NULL)
1235 snext->se_prev = sp->se_prev;
1240 if ((pid = start_getty(sp)) == -1) {
1241 /* serious trouble */
1242 requested_transition = clean_ttys;
1246 sp->se_process = pid;
1247 sp->se_started = time((time_t *) 0);
1252 * Catch a signal and request a state transition.
1255 transition_handler(sig)
1261 requested_transition = clean_ttys;
1264 howto = RB_POWEROFF;
1270 requested_transition = death;
1273 requested_transition = catatonia;
1276 requested_transition = 0;
1282 * Take the system multiuser.
1288 register session_t *sp;
1290 requested_transition = 0;
1293 * If the administrator has not set the security level to -1
1294 * to indicate that the kernel should not run multiuser in secure
1295 * mode, and the run script has not set a higher level of security
1296 * than level 1, then put the kernel into secure mode.
1298 if (getsecuritylevel() == 0)
1299 setsecuritylevel(1);
1301 for (sp = sessions; sp; sp = sp->se_next) {
1304 if ((pid = start_getty(sp)) == -1) {
1305 /* serious trouble */
1306 requested_transition = clean_ttys;
1309 sp->se_process = pid;
1310 sp->se_started = time((time_t *) 0);
1314 while (!requested_transition)
1315 if ((pid = waitpid(-1, (int *) 0, 0)) != -1)
1318 return (state_func_t) requested_transition;
1322 * This is an (n*2)+(n^2) algorithm. We hope it isn't run often...
1327 register session_t *sp, *sprev;
1328 register struct ttyent *typ;
1329 register int session_index = 0;
1330 register int devlen;
1331 char *old_getty, *old_window, *old_type;
1334 return (state_func_t) multi_user;
1337 * mark all sessions for death, (!SE_PRESENT)
1338 * as we find or create new ones they'll be marked as keepers,
1339 * we'll later nuke all the ones not found in /etc/ttys
1341 for (sp = sessions; sp != NULL; sp = sp->se_next)
1342 sp->se_flags &= ~SE_PRESENT;
1344 devlen = sizeof(_PATH_DEV) - 1;
1345 while ((typ = getttyent()) != NULL) {
1348 for (sprev = 0, sp = sessions; sp; sprev = sp, sp = sp->se_next)
1349 if (strcmp(typ->ty_name, sp->se_device + devlen) == 0)
1353 /* we want this one to live */
1354 sp->se_flags |= SE_PRESENT;
1355 if (sp->se_index != session_index) {
1356 warning("port %s changed utmp index from %d to %d",
1357 sp->se_device, sp->se_index,
1359 sp->se_index = session_index;
1361 if ((typ->ty_status & TTY_ON) == 0 ||
1362 typ->ty_getty == 0) {
1363 sp->se_flags |= SE_SHUTDOWN;
1364 kill(sp->se_process, SIGHUP);
1367 sp->se_flags &= ~SE_SHUTDOWN;
1368 old_getty = sp->se_getty ? strdup(sp->se_getty) : 0;
1369 old_window = sp->se_window ? strdup(sp->se_window) : 0;
1370 old_type = sp->se_type ? strdup(sp->se_type) : 0;
1371 if (setupargv(sp, typ) == 0) {
1372 warning("can't parse getty for port %s",
1374 sp->se_flags |= SE_SHUTDOWN;
1375 kill(sp->se_process, SIGHUP);
1377 else if ( !old_getty
1378 || (!old_type && sp->se_type)
1379 || (old_type && !sp->se_type)
1380 || (!old_window && sp->se_window)
1381 || (old_window && !sp->se_window)
1382 || (strcmp(old_getty, sp->se_getty) != 0)
1383 || (old_window && strcmp(old_window, sp->se_window) != 0)
1384 || (old_type && strcmp(old_type, sp->se_type) != 0)
1386 /* Don't set SE_SHUTDOWN here */
1389 kill(sp->se_process, SIGHUP);
1400 new_session(sprev, session_index, typ);
1406 * sweep through and kill all deleted sessions
1407 * ones who's /etc/ttys line was deleted (SE_PRESENT unset)
1409 for (sp = sessions; sp != NULL; sp = sp->se_next) {
1410 if ((sp->se_flags & SE_PRESENT) == 0) {
1411 sp->se_flags |= SE_SHUTDOWN;
1412 kill(sp->se_process, SIGHUP);
1416 return (state_func_t) multi_user;
1420 * Block further logins.
1425 register session_t *sp;
1427 for (sp = sessions; sp; sp = sp->se_next)
1428 sp->se_flags |= SE_SHUTDOWN;
1430 return (state_func_t) multi_user;
1445 * Bring the system down to single user.
1450 register session_t *sp;
1453 static const int death_sigs[2] = { SIGTERM, SIGKILL };
1455 /* NB: should send a message to the session logger to avoid blocking. */
1456 logwtmp("~", "shutdown", "");
1458 for (sp = sessions; sp; sp = sp->se_next) {
1459 sp->se_flags |= SE_SHUTDOWN;
1460 kill(sp->se_process, SIGHUP);
1463 /* Try to run the rc.shutdown script within a period of time */
1464 (void) runshutdown();
1466 for (i = 0; i < 2; ++i) {
1467 if (kill(-1, death_sigs[i]) == -1 && errno == ESRCH)
1468 return (state_func_t) single_user;
1473 if ((pid = waitpid(-1, (int *)0, 0)) != -1)
1475 while (clang == 0 && errno != ECHILD);
1477 if (errno == ECHILD)
1478 return (state_func_t) single_user;
1481 warning("some processes would not die; ps axl advised");
1483 return (state_func_t) single_user;
1487 * Run the system shutdown script.
1489 * Exit codes: XXX I should document more
1490 * -2 shutdown script terminated abnormally
1491 * -1 fatal error - can't run script
1493 * >0 some error (exit code)
1500 int shutdowntimeout;
1503 struct sigaction sa;
1507 * rc.shutdown is optional, so to prevent any unnecessary
1508 * complaints from the shell we simply don't run it if the
1509 * file does not exist. If the stat() here fails for other
1510 * reasons, we'll let the shell complain.
1512 if (stat(_PATH_RUNDOWN, &sb) == -1 && errno == ENOENT)
1515 if ((pid = fork()) == 0) {
1518 /* Assume that init already grab console as ctty before */
1520 sigemptyset(&sa.sa_mask);
1522 sa.sa_handler = SIG_IGN;
1523 (void) sigaction(SIGTSTP, &sa, (struct sigaction *)0);
1524 (void) sigaction(SIGHUP, &sa, (struct sigaction *)0);
1526 if ((fd = open(_PATH_CONSOLE, O_RDWR)) == -1)
1527 warning("can't open %s: %m", _PATH_CONSOLE);
1537 * Run the shutdown script.
1540 argv[1] = _PATH_RUNDOWN;
1547 sigprocmask(SIG_SETMASK, &sa.sa_mask, (sigset_t *) 0);
1550 setprocresources(RESOURCE_RC);
1552 execv(_PATH_BSHELL, argv);
1553 warning("can't exec %s for %s: %m", _PATH_BSHELL, _PATH_RUNDOWN);
1554 _exit(1); /* force single user mode */
1558 emergency("can't fork for %s on %s: %m",
1559 _PATH_BSHELL, _PATH_RUNDOWN);
1560 while (waitpid(-1, (int *) 0, WNOHANG) > 0)
1562 sleep(STALL_TIMEOUT);
1566 len = sizeof(shutdowntimeout);
1567 if (sysctlbyname("kern.shutdown_timeout",
1569 &len, NULL, 0) == -1 || shutdowntimeout < 2)
1570 shutdowntimeout = DEATH_SCRIPT;
1571 alarm(shutdowntimeout);
1574 * Copied from single_user(). This is a bit paranoid.
1575 * Use the same ALRM handler.
1578 if ((wpid = waitpid(-1, &status, WUNTRACED)) != -1)
1579 collect_child(wpid);
1581 /* we were waiting for the sub-shell */
1582 kill(wpid, SIGTERM);
1583 warning("timeout expired for %s on %s: %m; going to single user mode",
1584 _PATH_BSHELL, _PATH_RUNDOWN);
1590 warning("wait for %s on %s failed: %m; going to single user mode",
1591 _PATH_BSHELL, _PATH_RUNDOWN);
1594 if (wpid == pid && WIFSTOPPED(status)) {
1595 warning("init: %s on %s stopped, restarting\n",
1596 _PATH_BSHELL, _PATH_RUNDOWN);
1600 } while (wpid != pid && !clang);
1602 /* Turn off the alarm */
1605 if (WIFSIGNALED(status) && WTERMSIG(status) == SIGTERM &&
1606 requested_transition == catatonia) {
1608 * /etc/rc.shutdown executed /sbin/reboot;
1609 * wait for the end quietly
1618 if (!WIFEXITED(status)) {
1619 warning("%s on %s terminated abnormally, going to single user mode",
1620 _PATH_BSHELL, _PATH_RUNDOWN);
1624 if ((status = WEXITSTATUS(status)) != 0)
1625 warning("%s returned status %d", _PATH_RUNDOWN, status);
1643 while (c == ' ' || c == '\t' )
1653 while (c && c != '\'')
1655 if (!c) /* unterminated string */
1660 while (c && c != ' ' && c != '\t' )
1671 setprocresources(cname)
1675 if ((lc = login_getclassbyname(cname, NULL)) != NULL) {
1676 setusercontext(lc, (struct passwd*)NULL, 0, LOGIN_SETPRIORITY|LOGIN_SETRESOURCES);