]>
git.wh0rd.org - sysvinit.git/blob - src/init.c
7a05435e98fe7a534ff8f5a2e26516e43cefe0e0
2 * Init A System-V Init Clone.
5 * init [0123456SsQqAaBbCc]
6 * telinit [0123456SsQqAaBbCc]
8 * Version: @(#)init.c 2.86 30-Jul-2004 miquels@cistron.nl
10 #define VERSION "2.88"
11 #define DATE "31-Jul-2004"
13 * This file is part of the sysvinit suite,
14 * Copyright (C) 1991-2004 Miquel van Smoorenburg.
16 * This program is free software; you can redistribute it and/or modify
17 * it under the terms of the GNU General Public License as published by
18 * the Free Software Foundation; either version 2 of the License, or
19 * (at your option) any later version.
21 * This program is distributed in the hope that it will be useful,
22 * but WITHOUT ANY WARRANTY; without even the implied warranty of
23 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
24 * GNU General Public License for more details.
26 * You should have received a copy of the GNU General Public License
27 * along with this program; if not, write to the Free Software
28 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
32 #include <sys/types.h>
34 #include <sys/ioctl.h>
39 #include <sys/resource.h>
52 #include <sys/syslog.h>
56 #include <selinux/selinux.h>
63 # define STACK_DEBUG 1
64 # if (__GLIBC__ == 2 && __GLIBC_MINOR__ == 0)
65 /* Only glibc 2.0 needs this */
66 # include <sigcontext.h>
78 # define SIGPWR SIGUSR2
88 /* Set a signal handler. */
89 #define SETSIG(sa, sig, fun, flags) \
91 sa.sa_handler = fun; \
92 sa.sa_flags = flags; \
93 sigemptyset(&sa.sa_mask); \
94 sigaction(sig, &sa, NULL); \
97 /* Version information */
98 char *Version
= "@(#) init " VERSION
" " DATE
" miquels@cistron.nl";
99 char *bootmsg
= "version " VERSION
" %s";
100 #define E_VERSION "INIT_VERSION=sysvinit-" VERSION
102 CHILD
*family
= NULL
; /* The linked list of all entries */
103 CHILD
*newFamily
= NULL
; /* The list after inittab re-read */
105 CHILD ch_emerg
= { /* Emergency shell */
115 char runlevel
= 'S'; /* The current run level */
116 char thislevel
= 'S'; /* The current runlevel */
117 char prevlevel
= 'N'; /* Previous runlevel */
118 int dfl_level
= 0; /* Default runlevel */
119 sig_atomic_t got_cont
= 0; /* Set if we received the SIGCONT signal */
120 sig_atomic_t got_signals
; /* Set if we received a signal. */
121 int emerg_shell
= 0; /* Start emergency shell? */
122 int wrote_wtmp_reboot
= 1; /* Set when we wrote the reboot record */
123 int wrote_utmp_reboot
= 1; /* Set when we wrote the reboot record */
124 int sltime
= 5; /* Sleep time between TERM and KILL */
125 char *argv0
; /* First arguments; show up in ps listing */
126 int maxproclen
; /* Maximal length of argv[0] with \0 */
127 struct utmp utproto
; /* Only used for sizeof(utproto.ut_id) */
128 char *console_dev
; /* Console device. */
129 int pipe_fd
= -1; /* /dev/initctl */
130 int did_boot
= 0; /* Did we already do BOOT* stuff? */
131 int main(int, char **);
133 /* Used by re-exec part */
134 int reload
= 0; /* Should we do initialization stuff? */
135 char *myname
="/sbin/init"; /* What should we exec */
136 int oops_error
; /* Used by some of the re-exec code. */
137 const char *Signature
= "12567362"; /* Signature for re-exec fd */
139 /* Macro to see if this is a special action */
140 #define ISPOWER(i) ((i) == POWERWAIT || (i) == POWERFAIL || \
141 (i) == POWEROKWAIT || (i) == POWERFAILNOW || \
144 /* ascii values for the `action' field. */
149 { "respawn", RESPAWN
},
153 { "bootwait", BOOTWAIT
},
154 { "powerfail", POWERFAIL
},
155 { "powerfailnow",POWERFAILNOW
},
156 { "powerwait", POWERWAIT
},
157 { "powerokwait", POWEROKWAIT
},
158 { "ctrlaltdel", CTRLALTDEL
},
160 { "ondemand", ONDEMAND
},
161 { "initdefault", INITDEFAULT
},
162 { "sysinit", SYSINIT
},
163 { "kbrequest", KBREQUEST
},
168 * State parser token table (see receive_state)
181 { "CMD", C_PROCESS
},
184 { "-RL", D_RUNLEVEL
},
185 { "-TL", D_THISLEVEL
},
186 { "-PL", D_PREVLEVEL
},
187 { "-SI", D_GOTSIGN
},
188 { "-WR", D_WROTE_WTMP_REBOOT
},
189 { "-WU", D_WROTE_UTMP_REBOOT
},
191 { "-DB", D_DIDBOOT
},
205 #define NR_EXTRA_ENV 16
206 char *extra_env
[NR_EXTRA_ENV
];
210 * Sleep a number of seconds.
212 * This only works correctly because the linux select updates
213 * the elapsed time in the struct timeval passed to select!
215 void do_sleep(int sec
)
222 while(select(0, NULL
, NULL
, NULL
, &tv
) < 0 && errno
== EINTR
)
228 * Non-failing allocation routines (init cannot fail).
230 void *imalloc(size_t size
)
234 while ((m
= malloc(size
)) == NULL
) {
235 initlog(L_VB
, "out of memory");
243 char *istrdup(char *s
)
256 * Send the state info of the previous running init to
257 * the new one, in a version-independant way.
259 void send_state(int fd
)
267 fprintf(fp
, "VER%s\n", Version
);
268 fprintf(fp
, "-RL%c\n", runlevel
);
269 fprintf(fp
, "-TL%c\n", thislevel
);
270 fprintf(fp
, "-PL%c\n", prevlevel
);
271 fprintf(fp
, "-SI%u\n", got_signals
);
272 fprintf(fp
, "-WR%d\n", wrote_wtmp_reboot
);
273 fprintf(fp
, "-WU%d\n", wrote_utmp_reboot
);
274 fprintf(fp
, "-ST%d\n", sltime
);
275 fprintf(fp
, "-DB%d\n", did_boot
);
277 for (p
= family
; p
; p
= p
->next
) {
278 fprintf(fp
, "REC%s\n", p
->id
);
279 fprintf(fp
, "LEV%s\n", p
->rlevel
);
280 for (i
= 0, val
= p
->flags
; flags
[i
].mask
; i
++)
281 if (val
& flags
[i
].mask
) {
282 val
&= ~flags
[i
].mask
;
283 fprintf(fp
, "FL %s\n",flags
[i
].name
);
285 fprintf(fp
, "PID%d\n",p
->pid
);
286 fprintf(fp
, "EXS%u\n",p
->exstat
);
287 for(i
= 0; actions
[i
].act
; i
++)
288 if (actions
[i
].act
== p
->action
) {
289 fprintf(fp
, "AC %s\n", actions
[i
].name
);
292 fprintf(fp
, "CMD%s\n", p
->process
);
293 fprintf(fp
, "EOR\n");
295 fprintf(fp
, "END\n");
300 * Read a string from a file descriptor.
301 * FIXME: why not use fgets() ?
303 static int get_string(char *p
, int size
, FILE *f
)
307 while ((c
= getc(f
)) != EOF
&& c
!= '\n') {
312 return (c
!= EOF
) && (size
> 0);
316 * Read trailing data from the state pipe until we see a newline.
318 static int get_void(FILE *f
)
322 while ((c
= getc(f
)) != EOF
&& c
!= '\n')
329 * Read the next "command" from the state pipe.
331 static int get_cmd(FILE *f
)
336 if (fread(cmd
, 1, sizeof(cmd
) - 1, f
) != sizeof(cmd
) - 1)
339 for(i
= 0; cmds
[i
].cmd
&& strcmp(cmds
[i
].name
, cmd
) != 0; i
++)
345 * Read a CHILD * from the state pipe.
347 static CHILD
*get_record(FILE *f
)
355 switch (cmd
= get_cmd(f
)) {
365 fscanf(f
, "%c\n", &runlevel
);
368 fscanf(f
, "%c\n", &thislevel
);
371 fscanf(f
, "%c\n", &prevlevel
);
374 fscanf(f
, "%u\n", &got_signals
);
376 case D_WROTE_WTMP_REBOOT
:
377 fscanf(f
, "%d\n", &wrote_wtmp_reboot
);
379 case D_WROTE_UTMP_REBOOT
:
380 fscanf(f
, "%d\n", &wrote_utmp_reboot
);
383 fscanf(f
, "%d\n", &sltime
);
386 fscanf(f
, "%d\n", &did_boot
);
389 if (cmd
> 0 || cmd
== C_EOF
) {
394 } while (cmd
!= C_REC
);
396 p
= imalloc(sizeof(CHILD
));
397 get_string(p
->id
, sizeof(p
->id
), f
);
399 do switch(cmd
= get_cmd(f
)) {
405 fscanf(f
, "%d\n", &(p
->pid
));
408 fscanf(f
, "%u\n", &(p
->exstat
));
411 get_string(p
->rlevel
, sizeof(p
->rlevel
), f
);
414 get_string(p
->process
, sizeof(p
->process
), f
);
417 get_string(s
, sizeof(s
), f
);
418 for(i
= 0; flags
[i
].name
; i
++) {
419 if (strcmp(flags
[i
].name
,s
) == 0)
422 p
->flags
|= flags
[i
].mask
;
425 get_string(s
, sizeof(s
), f
);
426 for(i
= 0; actions
[i
].name
; i
++) {
427 if (strcmp(actions
[i
].name
, s
) == 0)
430 p
->action
= actions
[i
].act
? actions
[i
].act
: OFF
;
436 } while( cmd
!= C_EOR
);
442 * Read the complete state info from the state pipe.
443 * Returns 0 on success
445 int receive_state(int fd
)
448 char old_version
[256];
453 if (get_cmd(f
) != C_VER
)
455 get_string(old_version
, sizeof(old_version
), f
);
457 for (pp
= &family
; (*pp
= get_record(f
)) != NULL
; pp
= &((*pp
)->next
))
464 * Set the process title.
467 __attribute__ ((format (printf
, 1, 2)))
469 static int setproctitle(char *fmt
, ...)
478 len
= vsnprintf(buf
, sizeof(buf
), fmt
, ap
);
481 if (maxproclen
> 1) {
482 memset(argv0
, 0, maxproclen
);
483 strncpy(argv0
, buf
, maxproclen
- 1);
490 * Set console_dev to a working console.
492 void console_init(void)
495 int tried_devcons
= 0;
496 int tried_vtmaster
= 0;
499 if ((s
= getenv("CONSOLE")) != NULL
)
502 console_dev
= CONSOLE
;
506 while ((fd
= open(console_dev
, O_RDONLY
|O_NONBLOCK
)) < 0) {
507 if (!tried_devcons
) {
509 console_dev
= CONSOLE
;
512 if (!tried_vtmaster
) {
514 console_dev
= VT_MASTER
;
520 console_dev
= "/dev/null";
527 * Open the console with retries.
529 int console_open(int mode
)
535 * Open device in nonblocking mode.
537 m
= mode
| O_NONBLOCK
;
540 * Retry the open five times.
542 for(f
= 0; f
< 5; f
++) {
543 if ((fd
= open(console_dev
, m
)) >= 0) break;
547 if (fd
< 0) return fd
;
550 * Set original flags.
553 fcntl(fd
, F_SETFL
, mode
);
558 * We got a signal (HUP PWR WINCH ALRM INT)
560 void signal_handler(int sig
)
562 ADDSET(got_signals
, sig
);
566 * SIGCHLD: one of our children has died.
572 int saved_errno
= errno
;
575 * Find out which process(es) this was (were)
577 while((pid
= waitpid(-1, &st
, WNOHANG
)) != 0) {
578 if (errno
== ECHILD
) break;
579 for( ch
= family
; ch
; ch
= ch
->next
)
580 if ( ch
->pid
== pid
&& (ch
->flags
& RUNNING
) ) {
582 "chld_handler: marked %d as zombie",
584 ADDSET(got_signals
, SIGCHLD
);
588 ch
->new->exstat
= st
;
589 ch
->new->flags
|= ZOMBIE
;
594 INITDBG(L_VB
, "chld_handler: unknown child %d exited.",
602 * Linux ignores all signals sent to init when the
603 * SIG_DFL handler is installed. Therefore we must catch SIGTSTP
604 * and SIGCONT, or else they won't work....
606 * The SIGCONT handler
614 * Fork and dump core in /.
618 static int dumped
= 0;
625 if (fork() != 0) return;
628 sigprocmask(SIG_SETMASK
, &mask
, NULL
);
630 rlim
.rlim_cur
= RLIM_INFINITY
;
631 rlim
.rlim_max
= RLIM_INFINITY
;
632 setrlimit(RLIMIT_CORE
, &rlim
);
635 signal(SIGSEGV
, SIG_DFL
);
637 sigdelset(&mask
, SIGSEGV
);
638 sigprocmask(SIG_SETMASK
, &mask
, NULL
);
645 * OOPS: segmentation violation!
646 * If we have the info, print where it occured.
647 * Then sleep 30 seconds and try to continue.
649 #if defined(STACK_DEBUG) && defined(__linux__)
650 void segv_handler(int sig
, struct sigcontext ctx
)
653 int saved_errno
= errno
;
655 if ((void *)ctx
.eip
>= (void *)do_sleep
&&
656 (void *)ctx
.eip
< (void *)main
)
658 initlog(L_VB
, "PANIC: segmentation violation at %p%s! "
659 "sleeping for 30 seconds.", (void *)ctx
.eip
, p
);
667 int saved_errno
= errno
;
670 "PANIC: segmentation violation! sleeping for 30 seconds.");
678 * The SIGSTOP & SIGTSTP handler
682 int saved_errno
= errno
;
685 while(!got_cont
) pause();
691 * Set terminal settings to reasonable defaults
693 void console_stty(void)
698 if ((fd
= console_open(O_RDWR
|O_NOCTTY
)) < 0) {
699 initlog(L_VB
, "can't open %s", console_dev
);
703 (void) tcgetattr(fd
, &tty
);
705 tty
.c_cflag
&= CBAUD
|CBAUDEX
|CSIZE
|CSTOPB
|PARENB
|PARODD
;
706 tty
.c_cflag
|= HUPCL
|CLOCAL
|CREAD
;
708 tty
.c_cc
[VINTR
] = 3; /* ctrl('c') */
709 tty
.c_cc
[VQUIT
] = 28; /* ctrl('\\') */
710 tty
.c_cc
[VERASE
] = 127;
711 tty
.c_cc
[VKILL
] = 24; /* ctrl('x') */
712 tty
.c_cc
[VEOF
] = 4; /* ctrl('d') */
715 tty
.c_cc
[VSTART
] = 17; /* ctrl('q') */
716 tty
.c_cc
[VSTOP
] = 19; /* ctrl('s') */
717 tty
.c_cc
[VSUSP
] = 26; /* ctrl('z') */
720 * Set pre and post processing
722 tty
.c_iflag
= IGNPAR
|ICRNL
|IXON
|IXANY
;
723 tty
.c_oflag
= OPOST
|ONLCR
;
724 tty
.c_lflag
= ISIG
|ICANON
|ECHO
|ECHOCTL
|ECHOPRT
|ECHOKE
;
727 * Now set the terminal line.
728 * We don't care about non-transmitted output data
729 * and non-read input data.
731 (void) tcsetattr(fd
, TCSANOW
, &tty
);
732 (void) tcflush(fd
, TCIOFLUSH
);
737 * Print to the system console
743 if ((fd
= console_open(O_WRONLY
|O_NOCTTY
|O_NDELAY
)) >= 0) {
744 write(fd
, s
, strlen(s
));
750 * Log something to a logfile and the console.
753 __attribute__ ((format (printf
, 2, 3)))
755 void initlog(int loglevel
, char *s
, ...)
759 sigset_t nmask
, omask
;
761 va_start(va_alist
, s
);
762 vsnprintf(buf
, sizeof(buf
), s
, va_alist
);
765 if (loglevel
& L_SY
) {
767 * Re-establish connection with syslogd every time.
768 * Block signals while talking to syslog.
771 sigprocmask(SIG_BLOCK
, &nmask
, &omask
);
772 openlog("init", 0, LOG_DAEMON
);
773 syslog(LOG_INFO
, "%s", buf
);
775 sigprocmask(SIG_SETMASK
, &omask
, NULL
);
779 * And log to the console.
781 if (loglevel
& L_CO
) {
790 * Build a new environment for execve().
792 char **init_buildenv(int child
)
794 char i_lvl
[] = "RUNLEVEL=x";
795 char i_prev
[] = "PREVLEVEL=x";
800 for (n
= 0; environ
[n
]; n
++)
802 n
+= NR_EXTRA_ENV
+ 8;
803 e
= calloc(n
, sizeof(char *));
805 for (n
= 0; environ
[n
]; n
++)
806 e
[n
] = istrdup(environ
[n
]);
808 for (i
= 0; i
< NR_EXTRA_ENV
; i
++)
810 e
[n
++] = istrdup(extra_env
[i
]);
813 snprintf(i_cons
, sizeof(i_cons
), "CONSOLE=%s", console_dev
);
814 i_lvl
[9] = thislevel
;
815 i_prev
[10] = prevlevel
;
816 e
[n
++] = istrdup(i_lvl
);
817 e
[n
++] = istrdup(i_prev
);
818 e
[n
++] = istrdup(i_cons
);
819 e
[n
++] = istrdup(E_VERSION
);
828 void init_freeenv(char **e
)
832 for (n
= 0; e
[n
]; n
++)
841 * This function is too long and indents too deep.
844 int spawn(CHILD
*ch
, int *res
)
846 char *args
[16]; /* Argv array */
847 char buf
[136]; /* Line buffer */
848 int f
, st
, rc
; /* Scratch variables */
849 char *ptr
; /* Ditto */
850 time_t t
; /* System time */
851 int oldAlarm
; /* Previous alarm value */
852 char *proc
= ch
->process
; /* Command line */
853 pid_t pid
, pgrp
; /* child, console process group. */
854 sigset_t nmask
, omask
; /* For blocking SIGCHLD */
858 buf
[sizeof(buf
) - 1] = 0;
860 /* Skip '+' if it's there */
861 if (proc
[0] == '+') proc
++;
863 ch
->flags
|= XECUTED
;
865 if (ch
->action
== RESPAWN
|| ch
->action
== ONDEMAND
) {
866 /* Is the date stamp from less than 2 minutes ago? */
868 if (ch
->tm
+ TESTTIME
> t
) {
875 /* Do we try to respawn too fast? */
876 if (ch
->count
>= MAXSPAWN
) {
879 "Id \"%s\" respawning too fast: disabled for %d minutes",
880 ch
->id
, SLEEPTIME
/ 60);
881 ch
->flags
&= ~RUNNING
;
882 ch
->flags
|= FAILING
;
884 /* Remember the time we stopped */
887 /* Try again in 5 minutes */
889 if (oldAlarm
> SLEEPTIME
|| oldAlarm
<= 0) oldAlarm
= SLEEPTIME
;
895 /* See if there is an "initscript" (except in single user mode). */
896 if (access(INITSCRIPT
, R_OK
) == 0 && runlevel
!= 'S') {
897 /* Build command line using "initscript" */
899 args
[2] = INITSCRIPT
;
901 args
[4] = ch
->rlevel
;
903 for(f
= 0; actions
[f
].name
; f
++) {
904 if (ch
->action
== actions
[f
].act
) {
905 args
[5] = actions
[f
].name
;
911 } else if (strpbrk(proc
, "~`!$^&*()=|\\{}[];\"'<>?")) {
912 /* See if we need to fire off a shell for this command */
913 /* Give command line to shell */
916 strcpy(buf
, "exec ");
917 strncat(buf
, proc
, sizeof(buf
) - strlen(buf
) - 1);
921 /* Split up command line arguments */
923 strncat(buf
, proc
, sizeof(buf
) - 1);
925 for(f
= 1; f
< 15; f
++) {
926 /* Skip white space */
927 while(*ptr
== ' ' || *ptr
== '\t') ptr
++;
930 /* May be trailing space.. */
931 if (*ptr
== 0) break;
933 /* Skip this `word' */
934 while(*ptr
&& *ptr
!= ' ' && *ptr
!= '\t' && *ptr
!= '#')
937 /* If end-of-line, break */
938 if (*ptr
== '#' || *ptr
== 0) {
943 /* End word with \0 and continue */
951 * Block sigchild while forking.
954 sigaddset(&nmask
, SIGCHLD
);
955 sigprocmask(SIG_BLOCK
, &nmask
, &omask
);
957 if ((pid
= fork()) == 0) {
962 if (pipe_fd
>= 0) close(pipe_fd
);
964 sigprocmask(SIG_SETMASK
, &omask
, NULL
);
967 * In sysinit, boot, bootwait or single user mode:
968 * for any wait-type subprocess we _force_ the console
969 * to be its controlling tty.
971 if (strchr("*#sS", runlevel
) && ch
->flags
& WAITING
) {
973 * We fork once extra. This is so that we can
974 * wait and change the process group and session
975 * of the console after exit of the leader.
978 if ((f
= console_open(O_RDWR
|O_NOCTTY
)) >= 0) {
979 /* Take over controlling tty by force */
980 (void)ioctl(f
, TIOCSCTTY
, 1);
984 SETSIG(sa
, SIGCHLD
, SIG_DFL
, SA_RESTART
);
985 if ((pid
= fork()) < 0) {
986 initlog(L_VB
, "cannot fork: %s",
992 * Ignore keyboard signals etc.
993 * Then wait for child to exit.
995 SETSIG(sa
, SIGINT
, SIG_IGN
, SA_RESTART
);
996 SETSIG(sa
, SIGTSTP
, SIG_IGN
, SA_RESTART
);
997 SETSIG(sa
, SIGQUIT
, SIG_IGN
, SA_RESTART
);
999 while ((rc
= waitpid(pid
, &st
, 0)) != pid
)
1000 if (rc
< 0 && errno
== ECHILD
)
1004 * Small optimization. See if stealing
1005 * controlling tty back is needed.
1007 pgrp
= tcgetpgrp(f
);
1008 if (pgrp
!= getpid())
1012 * Steal controlling tty away. We do
1013 * this with a temporary process.
1015 if ((pid
= fork()) < 0) {
1016 initlog(L_VB
, "cannot fork: %s",
1022 (void)ioctl(f
, TIOCSCTTY
, 1);
1025 while((rc
= waitpid(pid
, &st
, 0)) != pid
)
1026 if (rc
< 0 && errno
== ECHILD
)
1031 /* Set ioctl settings to default ones */
1036 if ((f
= console_open(O_RDWR
|O_NOCTTY
)) < 0) {
1037 initlog(L_VB
, "open(%s): %s", console_dev
,
1039 f
= open("/dev/null", O_RDWR
);
1045 /* Reset all the signals, set up environment */
1046 for(f
= 1; f
< NSIG
; f
++) SETSIG(sa
, f
, SIG_DFL
, SA_RESTART
);
1047 environ
= init_buildenv(1);
1050 * Execute prog. In case of ENOEXEC try again
1051 * as a shell script.
1053 execvp(args
[1], args
+ 1);
1054 if (errno
== ENOEXEC
) {
1057 strcpy(buf
, "exec ");
1058 strncat(buf
, proc
, sizeof(buf
) - strlen(buf
) - 1);
1061 execvp(args
[1], args
+ 1);
1063 initlog(L_VB
, "cannot execute \"%s\"", args
[1]);
1067 sigprocmask(SIG_SETMASK
, &omask
, NULL
);
1069 INITDBG(L_VB
, "Started id %s (pid %d)", ch
->id
, pid
);
1072 initlog(L_VB
, "cannot fork, retry..");
1081 * Start a child running!
1083 void startup(CHILD
*ch
)
1086 * See if it's disabled
1088 if (ch
->flags
& FAILING
) return;
1090 switch(ch
->action
) {
1099 if (!(ch
->flags
& XECUTED
)) ch
->flags
|= WAITING
;
1104 if (ch
->flags
& XECUTED
) break;
1107 ch
->flags
|= RUNNING
;
1108 if (spawn(ch
, &(ch
->pid
)) < 0) break;
1110 * Do NOT log if process field starts with '+'
1111 * FIXME: that's for compatibility with *very*
1112 * old getties - probably it can be taken out.
1114 if (ch
->process
[0] != '+')
1115 write_utmp_wtmp("", ch
->id
, ch
->pid
,
1123 * Read the inittab file.
1125 void read_inittab(void)
1127 FILE *fp
; /* The INITTAB file */
1128 CHILD
*ch
, *old
, *i
; /* Pointers to CHILD structure */
1129 CHILD
*head
= NULL
; /* Head of linked list */
1131 struct stat st
; /* To stat INITLVL */
1133 sigset_t nmask
, omask
; /* For blocking SIGCHLD. */
1134 char buf
[256]; /* Line buffer */
1135 char err
[64]; /* Error message. */
1137 *action
, *process
; /* Fields of a line */
1139 int lineNo
= 0; /* Line number in INITTAB file */
1140 int actionNo
; /* Decoded action field */
1141 int f
; /* Counter */
1142 int round
; /* round 0 for SIGTERM, 1 for SIGKILL */
1143 int foundOne
= 0; /* No killing no sleep */
1144 int talk
; /* Talk to the user */
1145 int done
= 0; /* Ready yet? */
1148 if (newFamily
!= NULL
) {
1149 INITDBG(L_VB
, "PANIC newFamily != NULL");
1152 INITDBG(L_VB
, "Reading inittab");
1156 * Open INITTAB and real line by line.
1158 if ((fp
= fopen(INITTAB
, "r")) == NULL
)
1159 initlog(L_VB
, "No inittab file found");
1163 * Add single user shell entry at the end.
1165 if (fp
== NULL
|| fgets(buf
, sizeof(buf
), fp
) == NULL
) {
1168 * See if we have a single user entry.
1170 for(old
= newFamily
; old
; old
= old
->next
)
1171 if (strpbrk(old
->rlevel
, "S")) break;
1173 snprintf(buf
, sizeof(buf
), "~~:S:wait:%s\n", SULOGIN
);
1179 * Skip comments and empty lines
1181 for(p
= buf
; *p
== ' ' || *p
== '\t'; p
++)
1183 if (*p
== '#' || *p
== '\n') continue;
1188 id
= strsep(&p
, ":");
1189 rlevel
= strsep(&p
, ":");
1190 action
= strsep(&p
, ":");
1191 process
= strsep(&p
, "\n");
1194 * Check if syntax is OK. Be very verbose here, to
1195 * avoid newbie postings on comp.os.linux.setup :)
1198 if (!id
|| !*id
) strcpy(err
, "missing id field");
1199 if (!rlevel
) strcpy(err
, "missing runlevel field");
1200 if (!process
) strcpy(err
, "missing process field");
1201 if (!action
|| !*action
)
1202 strcpy(err
, "missing action field");
1203 if (id
&& strlen(id
) > sizeof(utproto
.ut_id
))
1204 sprintf(err
, "id field too long (max %d characters)",
1205 (int)sizeof(utproto
.ut_id
));
1206 if (rlevel
&& strlen(rlevel
) > 11)
1207 strcpy(err
, "rlevel field too long (max 11 characters)");
1208 if (process
&& strlen(process
) > 127)
1209 strcpy(err
, "process field too long");
1210 if (action
&& strlen(action
) > 32)
1211 strcpy(err
, "action field too long");
1213 initlog(L_VB
, "%s[%d]: %s", INITTAB
, lineNo
, err
);
1214 INITDBG(L_VB
, "%s:%s:%s:%s", id
, rlevel
, action
, process
);
1219 * Decode the "action" field
1222 for(f
= 0; actions
[f
].name
; f
++)
1223 if (strcasecmp(action
, actions
[f
].name
) == 0) {
1224 actionNo
= actions
[f
].act
;
1227 if (actionNo
== -1) {
1228 initlog(L_VB
, "%s[%d]: %s: unknown action field",
1229 INITTAB
, lineNo
, action
);
1234 * See if the id field is unique
1236 for(old
= newFamily
; old
; old
= old
->next
) {
1237 if(strcmp(old
->id
, id
) == 0 && strcmp(id
, "~~")) {
1238 initlog(L_VB
, "%s[%d]: duplicate ID field \"%s\"",
1239 INITTAB
, lineNo
, id
);
1246 * Allocate a CHILD structure
1248 ch
= imalloc(sizeof(CHILD
));
1253 ch
->action
= actionNo
;
1254 strncpy(ch
->id
, id
, sizeof(utproto
.ut_id
) + 1); /* Hack for different libs. */
1255 strncpy(ch
->process
, process
, sizeof(ch
->process
) - 1);
1257 for(f
= 0; f
< sizeof(rlevel
) - 1 && rlevel
[f
]; f
++) {
1258 ch
->rlevel
[f
] = rlevel
[f
];
1259 if (ch
->rlevel
[f
] == 's') ch
->rlevel
[f
] = 'S';
1261 strncpy(ch
->rlevel
, rlevel
, sizeof(ch
->rlevel
) - 1);
1263 strcpy(ch
->rlevel
, "0123456789");
1264 if (ISPOWER(ch
->action
))
1265 strcpy(ch
->rlevel
, "S0123456789");
1268 * We have the fake runlevel '#' for SYSINIT and
1269 * '*' for BOOT and BOOTWAIT.
1271 if (ch
->action
== SYSINIT
) strcpy(ch
->rlevel
, "#");
1272 if (ch
->action
== BOOT
|| ch
->action
== BOOTWAIT
)
1273 strcpy(ch
->rlevel
, "*");
1276 * Now add it to the linked list. Special for powerfail.
1278 if (ISPOWER(ch
->action
)) {
1281 * Disable by default
1283 ch
->flags
|= XECUTED
;
1286 * Tricky: insert at the front of the list..
1289 for(i
= newFamily
; i
; i
= i
->next
) {
1290 if (!ISPOWER(i
->action
)) break;
1294 * Now add after entry "old"
1299 if (i
== NULL
) head
= ch
;
1301 ch
->next
= newFamily
;
1303 if (ch
->next
== NULL
) head
= ch
;
1307 * Just add at end of the list
1309 if (ch
->action
== KBREQUEST
) ch
->flags
|= XECUTED
;
1319 * Walk through the old list comparing id fields
1321 for(old
= family
; old
; old
= old
->next
)
1322 if (strcmp(old
->id
, ch
->id
) == 0) {
1333 * Loop through the list of children, and see if they need to
1337 INITDBG(L_VB
, "Checking for children to kill");
1338 for(round
= 0; round
< 2; round
++) {
1340 for(ch
= family
; ch
; ch
= ch
->next
) {
1341 ch
->flags
&= ~KILLME
;
1344 * Is this line deleted?
1346 if (ch
->new == NULL
) ch
->flags
|= KILLME
;
1349 * If the entry has changed, kill it anyway. Note that
1350 * we do not check ch->process, only the "action" field.
1351 * This way, you can turn an entry "off" immediately, but
1352 * changes in the command line will only become effective
1353 * after the running version has exited.
1355 if (ch
->new && ch
->action
!= ch
->new->action
) ch
->flags
|= KILLME
;
1358 * Only BOOT processes may live in all levels
1360 if (ch
->action
!= BOOT
&&
1361 strchr(ch
->rlevel
, runlevel
) == NULL
) {
1363 * Ondemand procedures live always,
1364 * except in single user
1366 if (runlevel
== 'S' || !(ch
->flags
& DEMAND
))
1367 ch
->flags
|= KILLME
;
1371 * Now, if this process may live note so in the new list
1373 if ((ch
->flags
& KILLME
) == 0) {
1374 ch
->new->flags
= ch
->flags
;
1375 ch
->new->pid
= ch
->pid
;
1376 ch
->new->exstat
= ch
->exstat
;
1382 * Is this process still around?
1384 if ((ch
->flags
& RUNNING
) == 0) {
1385 ch
->flags
&= ~KILLME
;
1388 INITDBG(L_VB
, "Killing \"%s\"", ch
->process
);
1390 case 0: /* Send TERM signal */
1393 "Sending processes the TERM signal");
1394 kill(-(ch
->pid
), SIGTERM
);
1397 case 1: /* Send KILL signal and collect status */
1400 "Sending processes the KILL signal");
1401 kill(-(ch
->pid
), SIGKILL
);
1408 * See if we have to wait 5 seconds
1410 if (foundOne
&& round
== 0) {
1412 * Yup, but check every second if we still have children.
1414 for(f
= 0; f
< sltime
; f
++) {
1415 for(ch
= family
; ch
; ch
= ch
->next
) {
1416 if (!(ch
->flags
& KILLME
)) continue;
1417 if ((ch
->flags
& RUNNING
) && !(ch
->flags
& ZOMBIE
))
1422 * No running children, skip SIGKILL
1425 foundOne
= 0; /* Skip the sleep below. */
1434 * Now give all processes the chance to die and collect exit statuses.
1436 if (foundOne
) do_sleep(1);
1437 for(ch
= family
; ch
; ch
= ch
->next
)
1438 if (ch
->flags
& KILLME
) {
1439 if (!(ch
->flags
& ZOMBIE
))
1440 initlog(L_CO
, "Pid %d [id %s] seems to hang", ch
->pid
,
1443 INITDBG(L_VB
, "Updating utmp for pid %d [id %s]",
1445 ch
->flags
&= ~RUNNING
;
1446 if (ch
->process
[0] != '+')
1447 write_utmp_wtmp("", ch
->id
, ch
->pid
, DEAD_PROCESS
, NULL
);
1452 * Both rounds done; clean up the list.
1454 sigemptyset(&nmask
);
1455 sigaddset(&nmask
, SIGCHLD
);
1456 sigprocmask(SIG_BLOCK
, &nmask
, &omask
);
1457 for(ch
= family
; ch
; ch
= old
) {
1462 for(ch
= family
; ch
; ch
= ch
->next
) ch
->new = NULL
;
1464 sigprocmask(SIG_SETMASK
, &omask
, NULL
);
1468 * Dispose of INITLVL file.
1470 if (lstat(INITLVL
, &st
) >= 0 && S_ISLNK(st
.st_mode
)) {
1472 * INITLVL is a symbolic link, so just truncate the file.
1474 close(open(INITLVL
, O_WRONLY
|O_TRUNC
));
1477 * Delete INITLVL file.
1484 * Dispose of INITLVL2 file.
1486 if (lstat(INITLVL2
, &st
) >= 0 && S_ISLNK(st
.st_mode
)) {
1488 * INITLVL2 is a symbolic link, so just truncate the file.
1490 close(open(INITLVL2
, O_WRONLY
|O_TRUNC
));
1493 * Delete INITLVL2 file.
1501 * Walk through the family list and start up children.
1502 * The entries that do not belong here at all are removed
1505 void start_if_needed(void)
1507 CHILD
*ch
; /* Pointer to child */
1508 int delete; /* Delete this entry from list? */
1510 INITDBG(L_VB
, "Checking for children to start");
1512 for(ch
= family
; ch
; ch
= ch
->next
) {
1515 if (ch
->rlevel
[0] == 'C') {
1516 INITDBG(L_VB
, "%s: flags %d", ch
->process
, ch
->flags
);
1520 /* Are we waiting for this process? Then quit here. */
1521 if (ch
->flags
& WAITING
) break;
1523 /* Already running? OK, don't touch it */
1524 if (ch
->flags
& RUNNING
) continue;
1526 /* See if we have to start it up */
1528 if (strchr(ch
->rlevel
, runlevel
) ||
1529 ((ch
->flags
& DEMAND
) && !strchr("#*Ss", runlevel
))) {
1535 /* FIXME: is this OK? */
1536 ch
->flags
&= ~(RUNNING
|WAITING
);
1537 if (!ISPOWER(ch
->action
) && ch
->action
!= KBREQUEST
)
1538 ch
->flags
&= ~XECUTED
;
1541 /* Do we have to wait for this process? */
1542 if (ch
->flags
& WAITING
) break;
1548 * Ask the user on the console for a runlevel
1550 int ask_runlevel(void)
1552 const char prompt
[] = "\nEnter runlevel: ";
1558 fd
= console_open(O_RDWR
|O_NOCTTY
);
1560 if (fd
< 0) return('S');
1562 while(!strchr("0123456789S", lvl
)) {
1563 write(fd
, prompt
, sizeof(prompt
) - 1);
1565 read(fd
, buf
, sizeof(buf
));
1566 if (buf
[0] != 0 && (buf
[1] == '\r' || buf
[1] == '\n'))
1568 if (islower(lvl
)) lvl
= toupper(lvl
);
1575 * Search the INITTAB file for the 'initdefault' field, with the default
1576 * runlevel. If this fails, ask the user to supply a runlevel.
1578 int get_init_default(void)
1585 * Look for initdefault.
1587 for(ch
= family
; ch
; ch
= ch
->next
)
1588 if (ch
->action
== INITDEFAULT
) {
1591 if (*p
> lvl
) lvl
= *p
;
1597 * See if level is valid
1600 if (islower(lvl
)) lvl
= toupper(lvl
);
1601 if (strchr("0123456789S", lvl
) == NULL
) {
1603 "Initdefault level '%c' is invalid", lvl
);
1608 * Ask for runlevel on console if needed.
1610 if (lvl
<= 0) lvl
= ask_runlevel();
1613 * Log the fact that we have a runlevel now.
1622 * Do actions for the new level. If we are compatible with
1623 * the "old" INITLVL and arg == 0, try to read the new
1624 * runlevel from that file first.
1626 int read_level(int arg
)
1628 CHILD
*ch
; /* Walk through list */
1629 unsigned char foo
= 'X'; /* Contents of INITLVL */
1644 if (stat(INITLVL
, &stt
) != 0 || stt
.st_size
!= 0L)
1645 fp
= fopen(INITLVL
, "r");
1648 (stat(INITLVL2
, &stt
) != 0 || stt
.st_size
!= 0L))
1649 fp
= fopen(INITLVL2
, "r");
1652 /* INITLVL file empty or not there - act as 'init q' */
1653 initlog(L_SY
, "Re-reading inittab");
1656 ok
= fscanf(fp
, "%c %d", &foo
, &st
);
1659 /* We go to the new runlevel passed as an argument. */
1663 if (ok
== 2) sltime
= st
;
1665 #endif /* INITLVL */
1667 if (islower(foo
)) foo
= toupper(foo
);
1668 if (ok
< 1 || ok
> 2 || strchr("QS0123456789ABCU", foo
) == NULL
) {
1669 initlog(L_VB
, "bad runlevel: %c", foo
);
1673 /* Log this action */
1676 initlog(L_VB
, "Going single user");
1679 initlog(L_SY
, "Re-reading inittab");
1685 "Activating demand-procedures for '%c'", foo
);
1688 initlog(L_SY
, "Trying to re-exec init");
1691 initlog(L_VB
, "Switching to runlevel: %c", foo
);
1694 if (foo
== 'Q') return runlevel
;
1696 /* Check if this is a runlevel a, b or c */
1697 if (strchr("ABC", foo
)) {
1698 if (runlevel
== 'S') return(runlevel
);
1700 /* Read inittab again first! */
1703 /* Mark those special tasks */
1704 for(ch
= family
; ch
; ch
= ch
->next
)
1705 if (strchr(ch
->rlevel
, foo
) != NULL
||
1706 strchr(ch
->rlevel
, tolower(foo
)) != NULL
) {
1707 ch
->flags
|= DEMAND
;
1708 ch
->flags
&= ~XECUTED
;
1710 "Marking (%s) as ondemand, flags %d",
1716 /* Store both the old and the new runlevel. */
1717 write_utmp_wtmp("runlevel", "~~", foo
+ 256*runlevel
, RUN_LVL
, "~");
1719 prevlevel
= runlevel
;
1725 * This procedure is called after every signal (SIGHUP, SIGALRM..)
1727 * Only clear the 'failing' flag if the process is sleeping
1728 * longer than 5 minutes, or inittab was read again due
1729 * to user interaction.
1731 void fail_check(void)
1733 CHILD
*ch
; /* Pointer to child structure */
1734 time_t t
; /* System time */
1735 time_t next_alarm
= 0; /* When to set next alarm */
1739 for(ch
= family
; ch
; ch
= ch
->next
) {
1741 if (ch
->flags
& FAILING
) {
1742 /* Can we free this sucker? */
1743 if (ch
->tm
+ SLEEPTIME
< t
) {
1744 ch
->flags
&= ~FAILING
;
1748 /* No, we'll look again later */
1749 if (next_alarm
== 0 ||
1750 ch
->tm
+ SLEEPTIME
> next_alarm
)
1751 next_alarm
= ch
->tm
+ SLEEPTIME
;
1757 if (next_alarm
< 1) next_alarm
= 1;
1762 /* Set all 'Fail' timers to 0 */
1763 void fail_cancel(void)
1767 for(ch
= family
; ch
; ch
= ch
->next
) {
1770 ch
->flags
&= ~FAILING
;
1775 * Start up powerfail entries.
1777 void do_power_fail(int pwrstat
)
1782 * Tell powerwait & powerfail entries to start up
1784 for (ch
= family
; ch
; ch
= ch
->next
) {
1785 if (pwrstat
== 'O') {
1787 * The power is OK again.
1789 if (ch
->action
== POWEROKWAIT
)
1790 ch
->flags
&= ~XECUTED
;
1791 } else if (pwrstat
== 'L') {
1793 * Low battery, shut down now.
1795 if (ch
->action
== POWERFAILNOW
)
1796 ch
->flags
&= ~XECUTED
;
1799 * Power is failing, shutdown imminent
1801 if (ch
->action
== POWERFAIL
|| ch
->action
== POWERWAIT
)
1802 ch
->flags
&= ~XECUTED
;
1808 * Check for state-pipe presence
1810 int check_pipe(int fd
)
1818 t
.tv_sec
= t
.tv_usec
= 0;
1820 if (select(fd
+1, &s
, NULL
, NULL
, &t
) != 1)
1822 if (read(fd
, signature
, 8) != 8)
1824 return strncmp(Signature
, signature
, 8) == 0;
1828 * Make a state-pipe.
1830 int make_pipe(int fd
)
1837 fcntl(fds
[1], F_SETFD
, 1);
1838 fcntl(fd
, F_SETFD
, 0);
1839 write(fds
[1], Signature
, 8);
1845 * Attempt to re-exec.
1850 sigset_t mask
, oldset
;
1855 if (strchr("S0123456",runlevel
) == NULL
)
1859 * Reset the alarm, and block all signals.
1863 sigprocmask(SIG_BLOCK
, &mask
, &oldset
);
1866 * construct a pipe fd --> STATE_PIPE and write a signature
1868 fd
= make_pipe(STATE_PIPE
);
1871 * It's a backup day today, so I'm pissed off. Being a BOFH, however,
1872 * does have it's advantages...
1877 DELSET(got_signals
, SIGCHLD
);
1878 DELSET(got_signals
, SIGHUP
);
1879 DELSET(got_signals
, SIGUSR1
);
1882 * That should be cleaned.
1884 for(ch
= family
; ch
; ch
= ch
->next
)
1885 if (ch
->flags
& ZOMBIE
) {
1886 INITDBG(L_VB
, "Child died, PID= %d", ch
->pid
);
1887 ch
->flags
&= ~(RUNNING
|ZOMBIE
|WAITING
);
1888 if (ch
->process
[0] != '+')
1889 write_utmp_wtmp("", ch
->id
, ch
->pid
, DEAD_PROCESS
, NULL
);
1892 if ((pid
= fork()) == 0) {
1894 * Child sends state information to the parent.
1901 * The existing init process execs a new init binary.
1903 env
= init_buildenv(0);
1904 execle(myname
, myname
, "--init", NULL
, env
);
1907 * We shouldn't be here, something failed.
1908 * Bitch, close the state pipe, unblock signals and return.
1912 sigprocmask(SIG_SETMASK
, &oldset
, NULL
);
1914 initlog(L_CO
, "Attempt to re-exec failed");
1919 * We got a change runlevel request through the
1920 * init.fifo. Process it.
1922 void fifo_new_level(int level
)
1929 if (level
== runlevel
) return;
1932 /* Are we waiting for a child? */
1933 for(ch
= family
; ch
; ch
= ch
->next
)
1934 if (ch
->flags
& WAITING
) break;
1938 /* We need to go into a new runlevel */
1939 oldlevel
= runlevel
;
1940 runlevel
= read_level(level
);
1941 if (runlevel
== 'U') {
1942 runlevel
= oldlevel
;
1945 if (oldlevel
!= 'S' && runlevel
== 'S') console_stty();
1946 if (runlevel
== '6' || runlevel
== '0' ||
1947 runlevel
== '1') console_stty();
1950 setproctitle("init [%c]", runlevel
);
1957 * Set/unset environment variables. The variables are
1958 * encoded as KEY=VAL\0KEY=VAL\0\0. With "=VAL" it means
1959 * setenv, without it means unsetenv.
1961 void initcmd_setenv(char *data
, int size
)
1963 char *env
, *p
, *e
, *eq
;
1968 while (*data
&& data
< e
) {
1970 for (p
= data
; *p
&& p
< e
; p
++)
1971 if (*p
== '=') eq
= p
;
1976 sz
= eq
? (eq
- env
) : (p
- env
);
1978 /*initlog(L_SY, "init_setenv: %s, %s, %d", env, eq, sz);*/
1981 * We only allow INIT_* to be set.
1983 if (strncmp(env
, "INIT_", 5) != 0)
1986 /* Free existing vars. */
1987 for (i
= 0; i
< NR_EXTRA_ENV
; i
++) {
1988 if (extra_env
[i
] == NULL
) continue;
1989 if (!strncmp(extra_env
[i
], env
, sz
) &&
1990 extra_env
[i
][sz
] == '=') {
1992 extra_env
[i
] = NULL
;
1996 /* Set new vars if needed. */
1997 if (eq
== NULL
) continue;
1998 for (i
= 0; i
< NR_EXTRA_ENV
; i
++) {
1999 if (extra_env
[i
] == NULL
) {
2000 extra_env
[i
] = istrdup(env
);
2009 * Read from the init FIFO. Processes like telnetd and rlogind can
2010 * ask us to create login processes on their behalf.
2012 * FIXME: this needs to be finished. NOT that it is buggy, but we need
2013 * to add the telnetd/rlogind stuff so people can start using it.
2014 * Maybe move to using an AF_UNIX socket so we can use
2015 * the 2.2 kernel credential stuff to see who we're talking to.
2018 void check_init_fifo(void)
2020 struct init_request request
;
2022 struct stat st
, st2
;
2028 * First, try to create /dev/initctl if not present.
2030 if (stat(INIT_FIFO
, &st2
) < 0 && errno
== ENOENT
)
2031 (void)mkfifo(INIT_FIFO
, 0600);
2034 * If /dev/initctl is open, stat the file to see if it
2035 * is still the _same_ inode.
2038 fstat(pipe_fd
, &st
);
2039 if (stat(INIT_FIFO
, &st2
) < 0 ||
2040 st
.st_dev
!= st2
.st_dev
||
2041 st
.st_ino
!= st2
.st_ino
) {
2048 * Now finally try to open /dev/initctl
2051 if ((pipe_fd
= open(INIT_FIFO
, O_RDWR
|O_NONBLOCK
)) >= 0) {
2052 fstat(pipe_fd
, &st
);
2053 if (!S_ISFIFO(st
.st_mode
)) {
2054 initlog(L_VB
, "%s is not a fifo", INIT_FIFO
);
2061 * Don't use fd's 0, 1 or 2.
2063 (void) dup2(pipe_fd
, PIPE_FD
);
2068 * Return to caller - we'll be back later.
2073 /* Wait for data to appear, _if_ the pipe was opened. */
2074 if (pipe_fd
>= 0) while(!quit
) {
2076 /* Do select, return on EINTR. */
2078 FD_SET(pipe_fd
, &fds
);
2081 n
= select(pipe_fd
+ 1, &fds
, NULL
, NULL
, &tv
);
2083 if (n
== 0 || errno
== EINTR
) return;
2087 /* Read the data, return on EINTR. */
2088 n
= read(pipe_fd
, &request
, sizeof(request
));
2091 * End of file. This can't happen under Linux (because
2092 * the pipe is opened O_RDWR - see select() in the
2093 * kernel) but you never know...
2100 if (errno
== EINTR
) return;
2101 initlog(L_VB
, "error reading initrequest");
2106 * This is a convenient point to also try to
2107 * find the console device or check if it changed.
2114 if (request
.magic
!= INIT_MAGIC
|| n
!= sizeof(request
)) {
2115 initlog(L_VB
, "got bogus initrequest");
2118 switch(request
.cmd
) {
2119 case INIT_CMD_RUNLVL
:
2120 sltime
= request
.sleeptime
;
2121 fifo_new_level(request
.runlevel
);
2124 case INIT_CMD_POWERFAIL
:
2125 sltime
= request
.sleeptime
;
2129 case INIT_CMD_POWERFAILNOW
:
2130 sltime
= request
.sleeptime
;
2134 case INIT_CMD_POWEROK
:
2135 sltime
= request
.sleeptime
;
2139 case INIT_CMD_SETENV
:
2140 initcmd_setenv(request
.i
.data
, sizeof(request
.i
.data
));
2143 initlog(L_VB
, "got unimplemented initrequest.");
2149 * We come here if the pipe couldn't be opened.
2151 if (pipe_fd
< 0) pause();
2157 * This function is used in the transition
2158 * sysinit (-> single user) boot -> multi-user.
2160 void boot_transitions()
2163 static int newlevel
= 0;
2164 static int warn
= 1;
2168 /* Check if there is something to wait for! */
2169 for( ch
= family
; ch
; ch
= ch
->next
)
2170 if ((ch
->flags
& RUNNING
) && ch
->action
!= BOOT
) break;
2173 /* No processes left in this level, proceed to next level. */
2177 case '#': /* SYSINIT -> BOOT */
2178 INITDBG(L_VB
, "SYSINIT -> BOOT");
2180 /* Write a boot record. */
2181 wrote_utmp_reboot
= 0;
2182 wrote_wtmp_reboot
= 0;
2183 write_utmp_wtmp("reboot", "~~", 0, BOOT_TIME
, "~");
2185 /* Get our run level */
2186 newlevel
= dfl_level
? dfl_level
: get_init_default();
2187 if (newlevel
== 'S') {
2188 runlevel
= newlevel
;
2189 /* Not really 'S' but show anyway. */
2190 setproctitle("init [S]");
2194 case '*': /* BOOT -> NORMAL */
2195 INITDBG(L_VB
, "BOOT -> NORMAL");
2196 if (runlevel
!= newlevel
)
2197 loglevel
= newlevel
;
2198 runlevel
= newlevel
;
2202 case 'S': /* Ended SU mode */
2204 INITDBG(L_VB
, "END SU MODE");
2205 newlevel
= get_init_default();
2206 if (!did_boot
&& newlevel
!= 'S')
2209 if (runlevel
!= newlevel
)
2210 loglevel
= newlevel
;
2211 runlevel
= newlevel
;
2215 for(ch
= family
; ch
; ch
= ch
->next
)
2216 if (strcmp(ch
->rlevel
, "S") == 0)
2217 ch
->flags
&= ~(FAILING
|WAITING
|XECUTED
);
2222 "no more processes left in this runlevel");
2225 if (got_signals
== 0)
2230 initlog(L_VB
, "Entering runlevel: %c", runlevel
);
2231 write_utmp_wtmp("runlevel", "~~", runlevel
+ 256 * oldlevel
, RUN_LVL
, "~");
2232 thislevel
= runlevel
;
2233 prevlevel
= oldlevel
;
2234 setproctitle("init [%c]", runlevel
);
2240 * Init got hit by a signal. See which signal it is,
2241 * and act accordingly.
2243 void process_signals()
2251 if (ISMEMBER(got_signals
, SIGPWR
)) {
2252 INITDBG(L_VB
, "got SIGPWR");
2253 /* See _what_ kind of SIGPWR this is. */
2255 if ((fd
= open(PWRSTAT
, O_RDONLY
)) >= 0) {
2262 do_power_fail(pwrstat
);
2263 DELSET(got_signals
, SIGPWR
);
2266 if (ISMEMBER(got_signals
, SIGINT
)) {
2267 INITDBG(L_VB
, "got SIGINT");
2268 /* Tell ctrlaltdel entry to start up */
2269 for(ch
= family
; ch
; ch
= ch
->next
)
2270 if (ch
->action
== CTRLALTDEL
)
2271 ch
->flags
&= ~XECUTED
;
2272 DELSET(got_signals
, SIGINT
);
2275 if (ISMEMBER(got_signals
, SIGWINCH
)) {
2276 INITDBG(L_VB
, "got SIGWINCH");
2277 /* Tell kbrequest entry to start up */
2278 for(ch
= family
; ch
; ch
= ch
->next
)
2279 if (ch
->action
== KBREQUEST
)
2280 ch
->flags
&= ~XECUTED
;
2281 DELSET(got_signals
, SIGWINCH
);
2284 if (ISMEMBER(got_signals
, SIGALRM
)) {
2285 INITDBG(L_VB
, "got SIGALRM");
2286 /* The timer went off: check it out */
2287 DELSET(got_signals
, SIGALRM
);
2290 if (ISMEMBER(got_signals
, SIGCHLD
)) {
2291 INITDBG(L_VB
, "got SIGCHLD");
2292 /* First set flag to 0 */
2293 DELSET(got_signals
, SIGCHLD
);
2295 /* See which child this was */
2296 for(ch
= family
; ch
; ch
= ch
->next
)
2297 if (ch
->flags
& ZOMBIE
) {
2298 INITDBG(L_VB
, "Child died, PID= %d", ch
->pid
);
2299 ch
->flags
&= ~(RUNNING
|ZOMBIE
|WAITING
);
2300 if (ch
->process
[0] != '+')
2301 write_utmp_wtmp("", ch
->id
, ch
->pid
, DEAD_PROCESS
, NULL
);
2306 if (ISMEMBER(got_signals
, SIGHUP
)) {
2307 INITDBG(L_VB
, "got SIGHUP");
2309 /* Are we waiting for a child? */
2310 for(ch
= family
; ch
; ch
= ch
->next
)
2311 if (ch
->flags
& WAITING
) break;
2315 /* We need to go into a new runlevel */
2316 oldlevel
= runlevel
;
2318 runlevel
= read_level(0);
2320 if (runlevel
== 'U') {
2321 runlevel
= oldlevel
;
2324 if (oldlevel
!= 'S' && runlevel
== 'S') console_stty();
2325 if (runlevel
== '6' || runlevel
== '0' ||
2326 runlevel
== '1') console_stty();
2329 setproctitle("init [%c]", runlevel
);
2330 DELSET(got_signals
, SIGHUP
);
2334 if (ISMEMBER(got_signals
, SIGUSR1
)) {
2336 * SIGUSR1 means close and reopen /dev/initctl
2338 INITDBG(L_VB
, "got SIGUSR1");
2341 DELSET(got_signals
, SIGUSR1
);
2351 struct sigaction sa
;
2360 * Fork so we can debug the init process.
2362 if ((f
= fork()) > 0) {
2363 static const char killmsg
[] = "PRNT: init killed.\r\n";
2366 while((rc
= wait(&st
)) != f
)
2367 if (rc
< 0 && errno
== ECHILD
)
2369 write(1, killmsg
, sizeof(killmsg
) - 1);
2376 * Tell the kernel to send us SIGINT when CTRL-ALT-DEL
2377 * is pressed, and that we want to handle keyboard signals.
2379 init_reboot(BMAGIC_SOFT
);
2380 if ((f
= open(VT_MASTER
, O_RDWR
| O_NOCTTY
)) >= 0) {
2381 (void) ioctl(f
, KDSIGACCEPT
, SIGWINCH
);
2384 (void) ioctl(0, KDSIGACCEPT
, SIGWINCH
);
2388 * Ignore all signals.
2390 for(f
= 1; f
<= NSIG
; f
++)
2391 SETSIG(sa
, f
, SIG_IGN
, SA_RESTART
);
2394 SETSIG(sa
, SIGALRM
, signal_handler
, 0);
2395 SETSIG(sa
, SIGHUP
, signal_handler
, 0);
2396 SETSIG(sa
, SIGINT
, signal_handler
, 0);
2397 SETSIG(sa
, SIGCHLD
, chld_handler
, SA_RESTART
);
2398 SETSIG(sa
, SIGPWR
, signal_handler
, 0);
2399 SETSIG(sa
, SIGWINCH
, signal_handler
, 0);
2400 SETSIG(sa
, SIGUSR1
, signal_handler
, 0);
2401 SETSIG(sa
, SIGSTOP
, stop_handler
, SA_RESTART
);
2402 SETSIG(sa
, SIGTSTP
, stop_handler
, SA_RESTART
);
2403 SETSIG(sa
, SIGCONT
, cont_handler
, SA_RESTART
);
2404 SETSIG(sa
, SIGSEGV
, (void (*)(int))segv_handler
, SA_RESTART
);
2410 /* Close whatever files are open, and reset the console. */
2418 * Set default PATH variable.
2420 setenv("PATH", PATH_DEFAULT
, 1 /* Overwrite */);
2423 * Initialize /var/run/utmp (only works if /var is on
2424 * root and mounted rw)
2426 (void) close(open(UTMP_FILE
, O_WRONLY
|O_CREAT
|O_TRUNC
, 0644));
2429 * Say hello to the world
2431 initlog(L_CO
, bootmsg
, "booting");
2434 * See if we have to start an emergency shell.
2437 SETSIG(sa
, SIGCHLD
, SIG_DFL
, SA_RESTART
);
2438 if (spawn(&ch_emerg
, &f
) > 0) {
2439 while((rc
= wait(&st
)) != f
)
2440 if (rc
< 0 && errno
== ECHILD
)
2443 SETSIG(sa
, SIGCHLD
, chld_handler
, SA_RESTART
);
2447 * Start normal boot procedure.
2454 * Restart: unblock signals and let the show go on
2456 initlog(L_CO
, bootmsg
, "reloading");
2458 sigprocmask(SIG_UNBLOCK
, &sgt
, NULL
);
2461 * Set default PATH variable.
2463 setenv("PATH", PATH_DEFAULT
, 0 /* Don't overwrite */);
2469 /* See if we need to make the boot transitions. */
2471 INITDBG(L_VB
, "init_main: waiting..");
2473 /* Check if there are processes to be waited on. */
2474 for(ch
= family
; ch
; ch
= ch
->next
)
2475 if ((ch
->flags
& RUNNING
) && ch
->action
!= BOOT
) break;
2478 /* Wait until we get hit by some signal. */
2479 while (ch
!= NULL
&& got_signals
== 0) {
2480 if (ISMEMBER(got_signals
, SIGHUP
)) {
2481 /* See if there are processes to be waited on. */
2482 for(ch
= family
; ch
; ch
= ch
->next
)
2483 if (ch
->flags
& WAITING
) break;
2485 if (ch
!= NULL
) check_init_fifo();
2487 #else /* CHANGE_WAIT */
2488 if (ch
!= NULL
&& got_signals
== 0) check_init_fifo();
2489 #endif /* CHANGE_WAIT */
2491 /* Check the 'failing' flags */
2494 /* Process any signals. */
2497 /* See what we need to start up (again) */
2504 * Tell the user about the syntax we expect.
2508 fprintf(stderr
, "Usage: %s {-e VAR[=VAL] | [-t SECONDS] {0|1|2|3|4|5|6|S|s|Q|q|A|a|B|b|C|c|U|u}}\n", s
);
2512 int telinit(char *progname
, int argc
, char **argv
)
2514 #ifdef TELINIT_USES_INITLVL
2517 struct init_request request
;
2518 struct sigaction sa
;
2522 memset(&request
, 0, sizeof(request
));
2523 request
.magic
= INIT_MAGIC
;
2525 while ((f
= getopt(argc
, argv
, "t:e:")) != EOF
) switch(f
) {
2527 sltime
= atoi(optarg
);
2531 env
= request
.i
.data
;
2533 if (env
+ l
+ 2 > request
.i
.data
+ sizeof(request
.i
.data
)) {
2534 fprintf(stderr
, "%s: -e option data "
2535 "too large\n", progname
);
2538 memcpy(env
, optarg
, l
);
2547 if (env
) *env
++ = 0;
2552 request
.cmd
= INIT_CMD_SETENV
;
2554 if (argc
- optind
!= 1 || strlen(argv
[optind
]) != 1)
2556 if (!strchr("0123456789SsQqAaBbCcUu", argv
[optind
][0]))
2558 request
.cmd
= INIT_CMD_RUNLVL
;
2559 request
.runlevel
= env
? 0 : argv
[optind
][0];
2560 request
.sleeptime
= sltime
;
2563 /* Open the fifo and write a command. */
2564 /* Make sure we don't hang on opening /dev/initctl */
2565 SETSIG(sa
, SIGALRM
, signal_handler
, 0);
2567 if ((fd
= open(INIT_FIFO
, O_WRONLY
)) >= 0 &&
2568 write(fd
, &request
, sizeof(request
)) == sizeof(request
)) {
2574 #ifdef TELINIT_USES_INITLVL
2575 if (request
.cmd
== INIT_CMD_RUNLVL
) {
2576 /* Fallthrough to the old method. */
2578 /* Now write the new runlevel. */
2579 if ((fp
= fopen(INITLVL
, "w")) == NULL
) {
2580 fprintf(stderr
, "%s: cannot create %s\n",
2584 fprintf(fp
, "%s %d", argv
[optind
], sltime
);
2587 /* And tell init about the pending runlevel change. */
2588 if (kill(INITPID
, SIGHUP
) < 0) perror(progname
);
2594 fprintf(stderr
, "%s: ", progname
);
2595 if (ISMEMBER(got_signals
, SIGALRM
)) {
2596 fprintf(stderr
, "timeout opening/writing control channel %s\n",
2605 * Main entry for init and telinit.
2607 int main(int argc
, char **argv
)
2614 /* Get my own name */
2615 if ((p
= strrchr(argv
[0], '/')) != NULL
)
2622 if (geteuid() != 0) {
2623 fprintf(stderr
, "%s: must be superuser.\n", p
);
2628 * Is this telinit or init ?
2630 isinit
= (getpid() == 1);
2631 for (f
= 1; f
< argc
; f
++) {
2632 if (!strcmp(argv
[f
], "-i") || !strcmp(argv
[f
], "--init")) {
2637 if (!isinit
) exit(telinit(p
, argc
, argv
));
2642 if (check_pipe(STATE_PIPE
)) {
2644 receive_state(STATE_PIPE
);
2646 myname
= istrdup(argv
[0]);
2649 for (f
= 0; f
< argc
; f
++)
2650 maxproclen
+= strlen(argv
[f
]) + 1;
2652 setproctitle("init [%c]",runlevel
);
2657 /* Check command line arguments */
2658 maxproclen
= strlen(argv
[0]) + 1;
2659 for(f
= 1; f
< argc
; f
++) {
2660 if (!strcmp(argv
[f
], "single") || !strcmp(argv
[f
], "-s"))
2662 else if (!strcmp(argv
[f
], "-a") || !strcmp(argv
[f
], "auto"))
2663 putenv("AUTOBOOT=YES");
2664 else if (!strcmp(argv
[f
], "-b") || !strcmp(argv
[f
],"emergency"))
2666 else if (!strcmp(argv
[f
], "-z")) {
2668 if (argv
[f
+ 1]) f
++;
2669 } else if (strchr("0123456789sS", argv
[f
][0])
2670 && strlen(argv
[f
]) == 1)
2671 dfl_level
= argv
[f
][0];
2672 /* "init u" in the very beginning makes no sense */
2673 if (dfl_level
== 's') dfl_level
= 'S';
2674 maxproclen
+= strlen(argv
[f
]) + 1;
2678 if (getenv("SELINUX_INIT") == NULL
&& !is_selinux_enabled()) {
2679 putenv("SELINUX_INIT=YES");
2680 if (selinux_init_load_policy(&enforce
) == 0 ) {
2681 execv(myname
, argv
);
2684 /* SELinux in enforcing mode but load_policy failed */
2685 /* At this point, we probably can't open /dev/console, so log() won't work */
2686 fprintf(stderr
,"Unable to load SELinux Policy. Machine is in enforcing mode. Halting now.\n");
2692 /* Start booting. */
2695 setproctitle("init boot");
2696 init_main(dfl_level
);