]>
git.wh0rd.org - sysvinit.git/blob - src/init.c
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 wrote_wtmp_rlevel
= 1; /* Set when we wrote the runlevel record */
125 int wrote_utmp_rlevel
= 1; /* Set when we wrote the runlevel record */
126 int sltime
= 5; /* Sleep time between TERM and KILL */
127 char *argv0
; /* First arguments; show up in ps listing */
128 int maxproclen
; /* Maximal length of argv[0] with \0 */
129 struct utmp utproto
; /* Only used for sizeof(utproto.ut_id) */
130 char *console_dev
; /* Console device. */
131 int pipe_fd
= -1; /* /dev/initctl */
132 int did_boot
= 0; /* Did we already do BOOT* stuff? */
133 int main(int, char **);
135 /* Used by re-exec part */
136 int reload
= 0; /* Should we do initialization stuff? */
137 char *myname
="/sbin/init"; /* What should we exec */
138 int oops_error
; /* Used by some of the re-exec code. */
139 const char *Signature
= "12567362"; /* Signature for re-exec fd */
141 /* Macro to see if this is a special action */
142 #define ISPOWER(i) ((i) == POWERWAIT || (i) == POWERFAIL || \
143 (i) == POWEROKWAIT || (i) == POWERFAILNOW || \
146 /* ascii values for the `action' field. */
151 { "respawn", RESPAWN
},
155 { "bootwait", BOOTWAIT
},
156 { "powerfail", POWERFAIL
},
157 { "powerfailnow",POWERFAILNOW
},
158 { "powerwait", POWERWAIT
},
159 { "powerokwait", POWEROKWAIT
},
160 { "ctrlaltdel", CTRLALTDEL
},
162 { "ondemand", ONDEMAND
},
163 { "initdefault", INITDEFAULT
},
164 { "sysinit", SYSINIT
},
165 { "kbrequest", KBREQUEST
},
170 * State parser token table (see receive_state)
183 { "CMD", C_PROCESS
},
186 { "-RL", D_RUNLEVEL
},
187 { "-TL", D_THISLEVEL
},
188 { "-PL", D_PREVLEVEL
},
189 { "-SI", D_GOTSIGN
},
190 { "-WR", D_WROTE_WTMP_REBOOT
},
191 { "-WU", D_WROTE_UTMP_REBOOT
},
193 { "-DB", D_DIDBOOT
},
194 { "-LW", D_WROTE_WTMP_RLEVEL
},
195 { "-LU", D_WROTE_UTMP_RLEVEL
},
209 #define NR_EXTRA_ENV 16
210 char *extra_env
[NR_EXTRA_ENV
];
214 * Sleep a number of seconds.
216 * This only works correctly because the linux select updates
217 * the elapsed time in the struct timeval passed to select!
219 void do_sleep(int sec
)
226 while(select(0, NULL
, NULL
, NULL
, &tv
) < 0 && errno
== EINTR
)
232 * Non-failing allocation routines (init cannot fail).
234 void *imalloc(size_t size
)
238 while ((m
= malloc(size
)) == NULL
) {
239 initlog(L_VB
, "out of memory");
247 char *istrdup(char *s
)
260 * Send the state info of the previous running init to
261 * the new one, in a version-independant way.
263 void send_state(int fd
)
271 fprintf(fp
, "VER%s\n", Version
);
272 fprintf(fp
, "-RL%c\n", runlevel
);
273 fprintf(fp
, "-TL%c\n", thislevel
);
274 fprintf(fp
, "-PL%c\n", prevlevel
);
275 fprintf(fp
, "-SI%u\n", got_signals
);
276 fprintf(fp
, "-WR%d\n", wrote_wtmp_reboot
);
277 fprintf(fp
, "-WU%d\n", wrote_utmp_reboot
);
278 fprintf(fp
, "-ST%d\n", sltime
);
279 fprintf(fp
, "-DB%d\n", did_boot
);
281 for (p
= family
; p
; p
= p
->next
) {
282 fprintf(fp
, "REC%s\n", p
->id
);
283 fprintf(fp
, "LEV%s\n", p
->rlevel
);
284 for (i
= 0, val
= p
->flags
; flags
[i
].mask
; i
++)
285 if (val
& flags
[i
].mask
) {
286 val
&= ~flags
[i
].mask
;
287 fprintf(fp
, "FL %s\n",flags
[i
].name
);
289 fprintf(fp
, "PID%d\n",p
->pid
);
290 fprintf(fp
, "EXS%u\n",p
->exstat
);
291 for(i
= 0; actions
[i
].act
; i
++)
292 if (actions
[i
].act
== p
->action
) {
293 fprintf(fp
, "AC %s\n", actions
[i
].name
);
296 fprintf(fp
, "CMD%s\n", p
->process
);
297 fprintf(fp
, "EOR\n");
299 fprintf(fp
, "END\n");
304 * Read a string from a file descriptor.
305 * FIXME: why not use fgets() ?
307 static int get_string(char *p
, int size
, FILE *f
)
311 while ((c
= getc(f
)) != EOF
&& c
!= '\n') {
316 return (c
!= EOF
) && (size
> 0);
320 * Read trailing data from the state pipe until we see a newline.
322 static int get_void(FILE *f
)
326 while ((c
= getc(f
)) != EOF
&& c
!= '\n')
333 * Read the next "command" from the state pipe.
335 static int get_cmd(FILE *f
)
340 if (fread(cmd
, 1, sizeof(cmd
) - 1, f
) != sizeof(cmd
) - 1)
343 for(i
= 0; cmds
[i
].cmd
&& strcmp(cmds
[i
].name
, cmd
) != 0; i
++)
349 * Read a CHILD * from the state pipe.
351 static CHILD
*get_record(FILE *f
)
359 switch (cmd
= get_cmd(f
)) {
369 fscanf(f
, "%c\n", &runlevel
);
372 fscanf(f
, "%c\n", &thislevel
);
375 fscanf(f
, "%c\n", &prevlevel
);
378 fscanf(f
, "%u\n", &got_signals
);
380 case D_WROTE_WTMP_REBOOT
:
381 fscanf(f
, "%d\n", &wrote_wtmp_reboot
);
383 case D_WROTE_UTMP_REBOOT
:
384 fscanf(f
, "%d\n", &wrote_utmp_reboot
);
387 fscanf(f
, "%d\n", &sltime
);
390 fscanf(f
, "%d\n", &did_boot
);
392 case D_WROTE_WTMP_RLEVEL
:
393 fscanf(f
, "%d\n", &wrote_wtmp_rlevel
);
395 case D_WROTE_UTMP_RLEVEL
:
396 fscanf(f
, "%d\n", &wrote_utmp_rlevel
);
399 if (cmd
> 0 || cmd
== C_EOF
) {
404 } while (cmd
!= C_REC
);
406 p
= imalloc(sizeof(CHILD
));
407 get_string(p
->id
, sizeof(p
->id
), f
);
409 do switch(cmd
= get_cmd(f
)) {
415 fscanf(f
, "%d\n", &(p
->pid
));
418 fscanf(f
, "%u\n", &(p
->exstat
));
421 get_string(p
->rlevel
, sizeof(p
->rlevel
), f
);
424 get_string(p
->process
, sizeof(p
->process
), f
);
427 get_string(s
, sizeof(s
), f
);
428 for(i
= 0; flags
[i
].name
; i
++) {
429 if (strcmp(flags
[i
].name
,s
) == 0)
432 p
->flags
|= flags
[i
].mask
;
435 get_string(s
, sizeof(s
), f
);
436 for(i
= 0; actions
[i
].name
; i
++) {
437 if (strcmp(actions
[i
].name
, s
) == 0)
440 p
->action
= actions
[i
].act
? actions
[i
].act
: OFF
;
446 } while( cmd
!= C_EOR
);
452 * Read the complete state info from the state pipe.
453 * Returns 0 on success
455 int receive_state(int fd
)
458 char old_version
[256];
463 if (get_cmd(f
) != C_VER
)
465 get_string(old_version
, sizeof(old_version
), f
);
467 for (pp
= &family
; (*pp
= get_record(f
)) != NULL
; pp
= &((*pp
)->next
))
474 * Set the process title.
477 __attribute__ ((format (printf
, 1, 2)))
479 static int setproctitle(char *fmt
, ...)
488 len
= vsnprintf(buf
, sizeof(buf
), fmt
, ap
);
491 if (maxproclen
> 1) {
492 memset(argv0
, 0, maxproclen
);
493 strncpy(argv0
, buf
, maxproclen
- 1);
500 * Set console_dev to a working console.
502 void console_init(void)
505 int tried_devcons
= 0;
506 int tried_vtmaster
= 0;
509 if ((s
= getenv("CONSOLE")) != NULL
)
512 console_dev
= CONSOLE
;
516 while ((fd
= open(console_dev
, O_RDONLY
|O_NONBLOCK
)) < 0) {
517 if (!tried_devcons
) {
519 console_dev
= CONSOLE
;
522 if (!tried_vtmaster
) {
524 console_dev
= VT_MASTER
;
530 console_dev
= "/dev/null";
537 * Open the console with retries.
539 int console_open(int mode
)
545 * Open device in nonblocking mode.
547 m
= mode
| O_NONBLOCK
;
550 * Retry the open five times.
552 for(f
= 0; f
< 5; f
++) {
553 if ((fd
= open(console_dev
, m
)) >= 0) break;
557 if (fd
< 0) return fd
;
560 * Set original flags.
563 fcntl(fd
, F_SETFL
, mode
);
568 * We got a signal (HUP PWR WINCH ALRM INT)
570 void signal_handler(int sig
)
572 ADDSET(got_signals
, sig
);
576 * SIGCHLD: one of our children has died.
582 int saved_errno
= errno
;
585 * Find out which process(es) this was (were)
587 while((pid
= waitpid(-1, &st
, WNOHANG
)) != 0) {
588 if (errno
== ECHILD
) break;
589 for( ch
= family
; ch
; ch
= ch
->next
)
590 if ( ch
->pid
== pid
&& (ch
->flags
& RUNNING
) ) {
592 "chld_handler: marked %d as zombie",
594 ADDSET(got_signals
, SIGCHLD
);
598 ch
->new->exstat
= st
;
599 ch
->new->flags
|= ZOMBIE
;
604 INITDBG(L_VB
, "chld_handler: unknown child %d exited.",
612 * Linux ignores all signals sent to init when the
613 * SIG_DFL handler is installed. Therefore we must catch SIGTSTP
614 * and SIGCONT, or else they won't work....
616 * The SIGCONT handler
624 * Fork and dump core in /.
628 static int dumped
= 0;
635 if (fork() != 0) return;
638 sigprocmask(SIG_SETMASK
, &mask
, NULL
);
640 rlim
.rlim_cur
= RLIM_INFINITY
;
641 rlim
.rlim_max
= RLIM_INFINITY
;
642 setrlimit(RLIMIT_CORE
, &rlim
);
645 signal(SIGSEGV
, SIG_DFL
);
647 sigdelset(&mask
, SIGSEGV
);
648 sigprocmask(SIG_SETMASK
, &mask
, NULL
);
655 * OOPS: segmentation violation!
656 * If we have the info, print where it occured.
657 * Then sleep 30 seconds and try to continue.
659 #if defined(STACK_DEBUG) && defined(__linux__)
660 void segv_handler(int sig
, struct sigcontext ctx
)
663 int saved_errno
= errno
;
665 if ((void *)ctx
.eip
>= (void *)do_sleep
&&
666 (void *)ctx
.eip
< (void *)main
)
668 initlog(L_VB
, "PANIC: segmentation violation at %p%s! "
669 "sleeping for 30 seconds.", (void *)ctx
.eip
, p
);
677 int saved_errno
= errno
;
680 "PANIC: segmentation violation! sleeping for 30 seconds.");
688 * The SIGSTOP & SIGTSTP handler
692 int saved_errno
= errno
;
695 while(!got_cont
) pause();
701 * Set terminal settings to reasonable defaults
703 void console_stty(void)
708 if ((fd
= console_open(O_RDWR
|O_NOCTTY
)) < 0) {
709 initlog(L_VB
, "can't open %s", console_dev
);
713 (void) tcgetattr(fd
, &tty
);
715 tty
.c_cflag
&= CBAUD
|CBAUDEX
|CSIZE
|CSTOPB
|PARENB
|PARODD
;
716 tty
.c_cflag
|= HUPCL
|CLOCAL
|CREAD
;
718 tty
.c_cc
[VINTR
] = 3; /* ctrl('c') */
719 tty
.c_cc
[VQUIT
] = 28; /* ctrl('\\') */
720 tty
.c_cc
[VERASE
] = 127;
721 tty
.c_cc
[VKILL
] = 24; /* ctrl('x') */
722 tty
.c_cc
[VEOF
] = 4; /* ctrl('d') */
725 tty
.c_cc
[VSTART
] = 17; /* ctrl('q') */
726 tty
.c_cc
[VSTOP
] = 19; /* ctrl('s') */
727 tty
.c_cc
[VSUSP
] = 26; /* ctrl('z') */
730 * Set pre and post processing
732 tty
.c_iflag
= IGNPAR
|ICRNL
|IXON
|IXANY
733 #ifdef IUTF8 /* Not defined on FreeBSD */
734 | (tty
.c_iflag
& IUTF8
)
737 tty
.c_oflag
= OPOST
|ONLCR
;
738 tty
.c_lflag
= ISIG
|ICANON
|ECHO
|ECHOCTL
|ECHOPRT
|ECHOKE
;
741 * Now set the terminal line.
742 * We don't care about non-transmitted output data
743 * and non-read input data.
745 (void) tcsetattr(fd
, TCSANOW
, &tty
);
746 (void) tcflush(fd
, TCIOFLUSH
);
751 * Print to the system console
757 if ((fd
= console_open(O_WRONLY
|O_NOCTTY
|O_NDELAY
)) >= 0) {
758 write(fd
, s
, strlen(s
));
764 * Log something to a logfile and the console.
767 __attribute__ ((format (printf
, 2, 3)))
769 void initlog(int loglevel
, char *s
, ...)
773 sigset_t nmask
, omask
;
775 va_start(va_alist
, s
);
776 vsnprintf(buf
, sizeof(buf
), s
, va_alist
);
779 if (loglevel
& L_SY
) {
781 * Re-establish connection with syslogd every time.
782 * Block signals while talking to syslog.
785 sigprocmask(SIG_BLOCK
, &nmask
, &omask
);
786 openlog("init", 0, LOG_DAEMON
);
787 syslog(LOG_INFO
, "%s", buf
);
789 sigprocmask(SIG_SETMASK
, &omask
, NULL
);
793 * And log to the console.
795 if (loglevel
& L_CO
) {
804 * Build a new environment for execve().
806 char **init_buildenv(int child
)
808 char i_lvl
[] = "RUNLEVEL=x";
809 char i_prev
[] = "PREVLEVEL=x";
814 for (n
= 0; environ
[n
]; n
++)
816 n
+= NR_EXTRA_ENV
+ 8;
817 e
= calloc(n
, sizeof(char *));
819 for (n
= 0; environ
[n
]; n
++)
820 e
[n
] = istrdup(environ
[n
]);
822 for (i
= 0; i
< NR_EXTRA_ENV
; i
++)
824 e
[n
++] = istrdup(extra_env
[i
]);
827 snprintf(i_cons
, sizeof(i_cons
), "CONSOLE=%s", console_dev
);
828 i_lvl
[9] = thislevel
;
829 i_prev
[10] = prevlevel
;
830 e
[n
++] = istrdup(i_lvl
);
831 e
[n
++] = istrdup(i_prev
);
832 e
[n
++] = istrdup(i_cons
);
833 e
[n
++] = istrdup(E_VERSION
);
842 void init_freeenv(char **e
)
846 for (n
= 0; e
[n
]; n
++)
855 * This function is too long and indents too deep.
858 int spawn(CHILD
*ch
, int *res
)
860 char *args
[16]; /* Argv array */
861 char buf
[136]; /* Line buffer */
862 int f
, st
, rc
; /* Scratch variables */
863 char *ptr
; /* Ditto */
864 time_t t
; /* System time */
865 int oldAlarm
; /* Previous alarm value */
866 char *proc
= ch
->process
; /* Command line */
867 pid_t pid
, pgrp
; /* child, console process group. */
868 sigset_t nmask
, omask
; /* For blocking SIGCHLD */
872 buf
[sizeof(buf
) - 1] = 0;
874 /* Skip '+' if it's there */
875 if (proc
[0] == '+') proc
++;
877 ch
->flags
|= XECUTED
;
879 if (ch
->action
== RESPAWN
|| ch
->action
== ONDEMAND
) {
880 /* Is the date stamp from less than 2 minutes ago? */
882 if (ch
->tm
+ TESTTIME
> t
) {
889 /* Do we try to respawn too fast? */
890 if (ch
->count
>= MAXSPAWN
) {
893 "Id \"%s\" respawning too fast: disabled for %d minutes",
894 ch
->id
, SLEEPTIME
/ 60);
895 ch
->flags
&= ~RUNNING
;
896 ch
->flags
|= FAILING
;
898 /* Remember the time we stopped */
901 /* Try again in 5 minutes */
903 if (oldAlarm
> SLEEPTIME
|| oldAlarm
<= 0) oldAlarm
= SLEEPTIME
;
909 /* See if there is an "initscript" (except in single user mode). */
910 if (access(INITSCRIPT
, R_OK
) == 0 && runlevel
!= 'S') {
911 /* Build command line using "initscript" */
913 args
[2] = INITSCRIPT
;
915 args
[4] = ch
->rlevel
;
917 for(f
= 0; actions
[f
].name
; f
++) {
918 if (ch
->action
== actions
[f
].act
) {
919 args
[5] = actions
[f
].name
;
925 } else if (strpbrk(proc
, "~`!$^&*()=|\\{}[];\"'<>?")) {
926 /* See if we need to fire off a shell for this command */
927 /* Give command line to shell */
930 strcpy(buf
, "exec ");
931 strncat(buf
, proc
, sizeof(buf
) - strlen(buf
) - 1);
935 /* Split up command line arguments */
937 strncat(buf
, proc
, sizeof(buf
) - 1);
939 for(f
= 1; f
< 15; f
++) {
940 /* Skip white space */
941 while(*ptr
== ' ' || *ptr
== '\t') ptr
++;
944 /* May be trailing space.. */
945 if (*ptr
== 0) break;
947 /* Skip this `word' */
948 while(*ptr
&& *ptr
!= ' ' && *ptr
!= '\t' && *ptr
!= '#')
951 /* If end-of-line, break */
952 if (*ptr
== '#' || *ptr
== 0) {
957 /* End word with \0 and continue */
965 * Block sigchild while forking.
968 sigaddset(&nmask
, SIGCHLD
);
969 sigprocmask(SIG_BLOCK
, &nmask
, &omask
);
971 if ((pid
= fork()) == 0) {
976 if (pipe_fd
>= 0) close(pipe_fd
);
978 sigprocmask(SIG_SETMASK
, &omask
, NULL
);
981 * Update utmp/wtmp file prior to starting
982 * any child. This MUST be done right here in
983 * the child process in order to prevent a race
984 * condition that occurs when the child
985 * process' time slice executes before the
986 * parent (can and does happen in a uniprocessor
987 * environment). If the child is a getty and
988 * the race condition happens, then init's utmp
989 * update will happen AFTER the getty runs
990 * and expects utmp to be updated already!
992 * Do NOT log if process field starts with '+'
993 * FIXME: that's for compatibility with *very*
994 * old getties - probably it can be taken out.
996 if (ch
->action
== RESPAWN
&& ch
->process
[0] != '+')
997 write_utmp_wtmp("", ch
->id
, getpid(), INIT_PROCESS
, "");
1000 * In sysinit, boot, bootwait or single user mode:
1001 * for any wait-type subprocess we _force_ the console
1002 * to be its controlling tty.
1004 if (strchr("*#sS", runlevel
) && ch
->flags
& WAITING
) {
1006 * We fork once extra. This is so that we can
1007 * wait and change the process group and session
1008 * of the console after exit of the leader.
1011 if ((f
= console_open(O_RDWR
|O_NOCTTY
)) >= 0) {
1012 /* Take over controlling tty by force */
1013 (void)ioctl(f
, TIOCSCTTY
, 1);
1019 * 4 Sep 2001, Andrea Arcangeli:
1020 * Fix a race in spawn() that is used to deadlock init in a
1021 * waitpid() loop: must set the childhandler as default before forking
1022 * off the child or the chld_handler could run before the waitpid loop
1023 * has a chance to find its zombie-child.
1025 SETSIG(sa
, SIGCHLD
, SIG_DFL
, SA_RESTART
);
1026 if ((pid
= fork()) < 0) {
1027 initlog(L_VB
, "cannot fork: %s",
1033 * Ignore keyboard signals etc.
1034 * Then wait for child to exit.
1036 SETSIG(sa
, SIGINT
, SIG_IGN
, SA_RESTART
);
1037 SETSIG(sa
, SIGTSTP
, SIG_IGN
, SA_RESTART
);
1038 SETSIG(sa
, SIGQUIT
, SIG_IGN
, SA_RESTART
);
1040 while ((rc
= waitpid(pid
, &st
, 0)) != pid
)
1041 if (rc
< 0 && errno
== ECHILD
)
1045 * Small optimization. See if stealing
1046 * controlling tty back is needed.
1048 pgrp
= tcgetpgrp(f
);
1049 if (pgrp
!= getpid())
1053 * Steal controlling tty away. We do
1054 * this with a temporary process.
1056 if ((pid
= fork()) < 0) {
1057 initlog(L_VB
, "cannot fork: %s",
1063 (void)ioctl(f
, TIOCSCTTY
, 1);
1066 while((rc
= waitpid(pid
, &st
, 0)) != pid
)
1067 if (rc
< 0 && errno
== ECHILD
)
1072 /* Set ioctl settings to default ones */
1077 if ((f
= console_open(O_RDWR
|O_NOCTTY
)) < 0) {
1078 initlog(L_VB
, "open(%s): %s", console_dev
,
1080 f
= open("/dev/null", O_RDWR
);
1086 /* Reset all the signals, set up environment */
1087 for(f
= 1; f
< NSIG
; f
++) SETSIG(sa
, f
, SIG_DFL
, SA_RESTART
);
1088 environ
= init_buildenv(1);
1091 * Execute prog. In case of ENOEXEC try again
1092 * as a shell script.
1094 execvp(args
[1], args
+ 1);
1095 if (errno
== ENOEXEC
) {
1098 strcpy(buf
, "exec ");
1099 strncat(buf
, proc
, sizeof(buf
) - strlen(buf
) - 1);
1102 execvp(args
[1], args
+ 1);
1104 initlog(L_VB
, "cannot execute \"%s\"", args
[1]);
1108 sigprocmask(SIG_SETMASK
, &omask
, NULL
);
1110 INITDBG(L_VB
, "Started id %s (pid %d)", ch
->id
, pid
);
1113 initlog(L_VB
, "cannot fork, retry..");
1122 * Start a child running!
1124 void startup(CHILD
*ch
)
1127 * See if it's disabled
1129 if (ch
->flags
& FAILING
) return;
1131 switch(ch
->action
) {
1140 if (!(ch
->flags
& XECUTED
)) ch
->flags
|= WAITING
;
1145 if (ch
->flags
& XECUTED
) break;
1148 ch
->flags
|= RUNNING
;
1149 (void)spawn(ch
, &(ch
->pid
));
1156 * Read the inittab file.
1158 void read_inittab(void)
1160 FILE *fp
; /* The INITTAB file */
1161 CHILD
*ch
, *old
, *i
; /* Pointers to CHILD structure */
1162 CHILD
*head
= NULL
; /* Head of linked list */
1164 struct stat st
; /* To stat INITLVL */
1166 sigset_t nmask
, omask
; /* For blocking SIGCHLD. */
1167 char buf
[256]; /* Line buffer */
1168 char err
[64]; /* Error message. */
1170 *action
, *process
; /* Fields of a line */
1172 int lineNo
= 0; /* Line number in INITTAB file */
1173 int actionNo
; /* Decoded action field */
1174 int f
; /* Counter */
1175 int round
; /* round 0 for SIGTERM, 1 for SIGKILL */
1176 int foundOne
= 0; /* No killing no sleep */
1177 int talk
; /* Talk to the user */
1178 int done
= 0; /* Ready yet? */
1181 if (newFamily
!= NULL
) {
1182 INITDBG(L_VB
, "PANIC newFamily != NULL");
1185 INITDBG(L_VB
, "Reading inittab");
1189 * Open INITTAB and real line by line.
1191 if ((fp
= fopen(INITTAB
, "r")) == NULL
)
1192 initlog(L_VB
, "No inittab file found");
1196 * Add single user shell entry at the end.
1198 if (fp
== NULL
|| fgets(buf
, sizeof(buf
), fp
) == NULL
) {
1201 * See if we have a single user entry.
1203 for(old
= newFamily
; old
; old
= old
->next
)
1204 if (strpbrk(old
->rlevel
, "S")) break;
1206 snprintf(buf
, sizeof(buf
), "~~:S:wait:%s\n", SULOGIN
);
1212 * Skip comments and empty lines
1214 for(p
= buf
; *p
== ' ' || *p
== '\t'; p
++)
1216 if (*p
== '#' || *p
== '\n') continue;
1221 id
= strsep(&p
, ":");
1222 rlevel
= strsep(&p
, ":");
1223 action
= strsep(&p
, ":");
1224 process
= strsep(&p
, "\n");
1227 * Check if syntax is OK. Be very verbose here, to
1228 * avoid newbie postings on comp.os.linux.setup :)
1231 if (!id
|| !*id
) strcpy(err
, "missing id field");
1232 if (!rlevel
) strcpy(err
, "missing runlevel field");
1233 if (!process
) strcpy(err
, "missing process field");
1234 if (!action
|| !*action
)
1235 strcpy(err
, "missing action field");
1236 if (id
&& strlen(id
) > sizeof(utproto
.ut_id
))
1237 sprintf(err
, "id field too long (max %d characters)",
1238 (int)sizeof(utproto
.ut_id
));
1239 if (rlevel
&& strlen(rlevel
) > 11)
1240 strcpy(err
, "rlevel field too long (max 11 characters)");
1241 if (process
&& strlen(process
) > 127)
1242 strcpy(err
, "process field too long");
1243 if (action
&& strlen(action
) > 32)
1244 strcpy(err
, "action field too long");
1246 initlog(L_VB
, "%s[%d]: %s", INITTAB
, lineNo
, err
);
1247 INITDBG(L_VB
, "%s:%s:%s:%s", id
, rlevel
, action
, process
);
1252 * Decode the "action" field
1255 for(f
= 0; actions
[f
].name
; f
++)
1256 if (strcasecmp(action
, actions
[f
].name
) == 0) {
1257 actionNo
= actions
[f
].act
;
1260 if (actionNo
== -1) {
1261 initlog(L_VB
, "%s[%d]: %s: unknown action field",
1262 INITTAB
, lineNo
, action
);
1267 * See if the id field is unique
1269 for(old
= newFamily
; old
; old
= old
->next
) {
1270 if(strcmp(old
->id
, id
) == 0 && strcmp(id
, "~~")) {
1271 initlog(L_VB
, "%s[%d]: duplicate ID field \"%s\"",
1272 INITTAB
, lineNo
, id
);
1279 * Allocate a CHILD structure
1281 ch
= imalloc(sizeof(CHILD
));
1286 ch
->action
= actionNo
;
1287 strncpy(ch
->id
, id
, sizeof(utproto
.ut_id
) + 1); /* Hack for different libs. */
1288 strncpy(ch
->process
, process
, sizeof(ch
->process
) - 1);
1290 for(f
= 0; f
< (int)sizeof(rlevel
) - 1 && rlevel
[f
]; f
++) {
1291 ch
->rlevel
[f
] = rlevel
[f
];
1292 if (ch
->rlevel
[f
] == 's') ch
->rlevel
[f
] = 'S';
1294 strncpy(ch
->rlevel
, rlevel
, sizeof(ch
->rlevel
) - 1);
1296 strcpy(ch
->rlevel
, "0123456789");
1297 if (ISPOWER(ch
->action
))
1298 strcpy(ch
->rlevel
, "S0123456789");
1301 * We have the fake runlevel '#' for SYSINIT and
1302 * '*' for BOOT and BOOTWAIT.
1304 if (ch
->action
== SYSINIT
) strcpy(ch
->rlevel
, "#");
1305 if (ch
->action
== BOOT
|| ch
->action
== BOOTWAIT
)
1306 strcpy(ch
->rlevel
, "*");
1309 * Now add it to the linked list. Special for powerfail.
1311 if (ISPOWER(ch
->action
)) {
1314 * Disable by default
1316 ch
->flags
|= XECUTED
;
1319 * Tricky: insert at the front of the list..
1322 for(i
= newFamily
; i
; i
= i
->next
) {
1323 if (!ISPOWER(i
->action
)) break;
1327 * Now add after entry "old"
1332 if (i
== NULL
) head
= ch
;
1334 ch
->next
= newFamily
;
1336 if (ch
->next
== NULL
) head
= ch
;
1340 * Just add at end of the list
1342 if (ch
->action
== KBREQUEST
) ch
->flags
|= XECUTED
;
1352 * Walk through the old list comparing id fields
1354 for(old
= family
; old
; old
= old
->next
)
1355 if (strcmp(old
->id
, ch
->id
) == 0) {
1366 * Loop through the list of children, and see if they need to
1370 INITDBG(L_VB
, "Checking for children to kill");
1371 for(round
= 0; round
< 2; round
++) {
1373 for(ch
= family
; ch
; ch
= ch
->next
) {
1374 ch
->flags
&= ~KILLME
;
1377 * Is this line deleted?
1379 if (ch
->new == NULL
) ch
->flags
|= KILLME
;
1382 * If the entry has changed, kill it anyway. Note that
1383 * we do not check ch->process, only the "action" field.
1384 * This way, you can turn an entry "off" immediately, but
1385 * changes in the command line will only become effective
1386 * after the running version has exited.
1388 if (ch
->new && ch
->action
!= ch
->new->action
) ch
->flags
|= KILLME
;
1391 * Only BOOT processes may live in all levels
1393 if (ch
->action
!= BOOT
&&
1394 strchr(ch
->rlevel
, runlevel
) == NULL
) {
1396 * Ondemand procedures live always,
1397 * except in single user
1399 if (runlevel
== 'S' || !(ch
->flags
& DEMAND
))
1400 ch
->flags
|= KILLME
;
1404 * Now, if this process may live note so in the new list
1406 if ((ch
->flags
& KILLME
) == 0) {
1407 ch
->new->flags
= ch
->flags
;
1408 ch
->new->pid
= ch
->pid
;
1409 ch
->new->exstat
= ch
->exstat
;
1415 * Is this process still around?
1417 if ((ch
->flags
& RUNNING
) == 0) {
1418 ch
->flags
&= ~KILLME
;
1421 INITDBG(L_VB
, "Killing \"%s\"", ch
->process
);
1423 case 0: /* Send TERM signal */
1426 "Sending processes the TERM signal");
1427 kill(-(ch
->pid
), SIGTERM
);
1430 case 1: /* Send KILL signal and collect status */
1433 "Sending processes the KILL signal");
1434 kill(-(ch
->pid
), SIGKILL
);
1441 * See if we have to wait 5 seconds
1443 if (foundOne
&& round
== 0) {
1445 * Yup, but check every second if we still have children.
1447 for(f
= 0; f
< sltime
; f
++) {
1448 for(ch
= family
; ch
; ch
= ch
->next
) {
1449 if (!(ch
->flags
& KILLME
)) continue;
1450 if ((ch
->flags
& RUNNING
) && !(ch
->flags
& ZOMBIE
))
1455 * No running children, skip SIGKILL
1458 foundOne
= 0; /* Skip the sleep below. */
1467 * Now give all processes the chance to die and collect exit statuses.
1469 if (foundOne
) do_sleep(1);
1470 for(ch
= family
; ch
; ch
= ch
->next
)
1471 if (ch
->flags
& KILLME
) {
1472 if (!(ch
->flags
& ZOMBIE
))
1473 initlog(L_CO
, "Pid %d [id %s] seems to hang", ch
->pid
,
1476 INITDBG(L_VB
, "Updating utmp for pid %d [id %s]",
1478 ch
->flags
&= ~RUNNING
;
1479 if (ch
->process
[0] != '+')
1480 write_utmp_wtmp("", ch
->id
, ch
->pid
, DEAD_PROCESS
, NULL
);
1485 * Both rounds done; clean up the list.
1487 sigemptyset(&nmask
);
1488 sigaddset(&nmask
, SIGCHLD
);
1489 sigprocmask(SIG_BLOCK
, &nmask
, &omask
);
1490 for(ch
= family
; ch
; ch
= old
) {
1495 for(ch
= family
; ch
; ch
= ch
->next
) ch
->new = NULL
;
1497 sigprocmask(SIG_SETMASK
, &omask
, NULL
);
1501 * Dispose of INITLVL file.
1503 if (lstat(INITLVL
, &st
) >= 0 && S_ISLNK(st
.st_mode
)) {
1505 * INITLVL is a symbolic link, so just truncate the file.
1507 close(open(INITLVL
, O_WRONLY
|O_TRUNC
));
1510 * Delete INITLVL file.
1517 * Dispose of INITLVL2 file.
1519 if (lstat(INITLVL2
, &st
) >= 0 && S_ISLNK(st
.st_mode
)) {
1521 * INITLVL2 is a symbolic link, so just truncate the file.
1523 close(open(INITLVL2
, O_WRONLY
|O_TRUNC
));
1526 * Delete INITLVL2 file.
1534 * Walk through the family list and start up children.
1535 * The entries that do not belong here at all are removed
1538 void start_if_needed(void)
1540 CHILD
*ch
; /* Pointer to child */
1541 int delete; /* Delete this entry from list? */
1543 INITDBG(L_VB
, "Checking for children to start");
1545 for(ch
= family
; ch
; ch
= ch
->next
) {
1548 if (ch
->rlevel
[0] == 'C') {
1549 INITDBG(L_VB
, "%s: flags %d", ch
->process
, ch
->flags
);
1553 /* Are we waiting for this process? Then quit here. */
1554 if (ch
->flags
& WAITING
) break;
1556 /* Already running? OK, don't touch it */
1557 if (ch
->flags
& RUNNING
) continue;
1559 /* See if we have to start it up */
1561 if (strchr(ch
->rlevel
, runlevel
) ||
1562 ((ch
->flags
& DEMAND
) && !strchr("#*Ss", runlevel
))) {
1568 /* FIXME: is this OK? */
1569 ch
->flags
&= ~(RUNNING
|WAITING
);
1570 if (!ISPOWER(ch
->action
) && ch
->action
!= KBREQUEST
)
1571 ch
->flags
&= ~XECUTED
;
1574 /* Do we have to wait for this process? */
1575 if (ch
->flags
& WAITING
) break;
1581 * Ask the user on the console for a runlevel
1583 int ask_runlevel(void)
1585 const char prompt
[] = "\nEnter runlevel: ";
1591 fd
= console_open(O_RDWR
|O_NOCTTY
);
1593 if (fd
< 0) return('S');
1595 while(!strchr("0123456789S", lvl
)) {
1596 write(fd
, prompt
, sizeof(prompt
) - 1);
1598 read(fd
, buf
, sizeof(buf
));
1599 if (buf
[0] != 0 && (buf
[1] == '\r' || buf
[1] == '\n'))
1601 if (islower(lvl
)) lvl
= toupper(lvl
);
1608 * Search the INITTAB file for the 'initdefault' field, with the default
1609 * runlevel. If this fails, ask the user to supply a runlevel.
1611 int get_init_default(void)
1618 * Look for initdefault.
1620 for(ch
= family
; ch
; ch
= ch
->next
)
1621 if (ch
->action
== INITDEFAULT
) {
1624 if (*p
> lvl
) lvl
= *p
;
1630 * See if level is valid
1633 if (islower(lvl
)) lvl
= toupper(lvl
);
1634 if (strchr("0123456789S", lvl
) == NULL
) {
1636 "Initdefault level '%c' is invalid", lvl
);
1641 * Ask for runlevel on console if needed.
1643 if (lvl
<= 0) lvl
= ask_runlevel();
1646 * Log the fact that we have a runlevel now.
1655 * Do actions for the new level. If we are compatible with
1656 * the "old" INITLVL and arg == 0, try to read the new
1657 * runlevel from that file first.
1659 int read_level(int arg
)
1661 CHILD
*ch
; /* Walk through list */
1662 unsigned char foo
= 'X'; /* Contents of INITLVL */
1677 if (stat(INITLVL
, &stt
) != 0 || stt
.st_size
!= 0L)
1678 fp
= fopen(INITLVL
, "r");
1681 (stat(INITLVL2
, &stt
) != 0 || stt
.st_size
!= 0L))
1682 fp
= fopen(INITLVL2
, "r");
1685 /* INITLVL file empty or not there - act as 'init q' */
1686 initlog(L_SY
, "Re-reading inittab");
1689 ok
= fscanf(fp
, "%c %d", &foo
, &st
);
1692 /* We go to the new runlevel passed as an argument. */
1696 if (ok
== 2) sltime
= st
;
1698 #endif /* INITLVL */
1700 if (islower(foo
)) foo
= toupper(foo
);
1701 if (ok
< 1 || ok
> 2 || strchr("QS0123456789ABCU", foo
) == NULL
) {
1702 initlog(L_VB
, "bad runlevel: %c", foo
);
1706 /* Log this action */
1709 initlog(L_VB
, "Going single user");
1712 initlog(L_SY
, "Re-reading inittab");
1718 "Activating demand-procedures for '%c'", foo
);
1721 initlog(L_SY
, "Trying to re-exec init");
1724 initlog(L_VB
, "Switching to runlevel: %c", foo
);
1727 if (foo
== 'Q') return runlevel
;
1729 /* Check if this is a runlevel a, b or c */
1730 if (strchr("ABC", foo
)) {
1731 if (runlevel
== 'S') return(runlevel
);
1733 /* Read inittab again first! */
1736 /* Mark those special tasks */
1737 for(ch
= family
; ch
; ch
= ch
->next
)
1738 if (strchr(ch
->rlevel
, foo
) != NULL
||
1739 strchr(ch
->rlevel
, tolower(foo
)) != NULL
) {
1740 ch
->flags
|= DEMAND
;
1741 ch
->flags
&= ~XECUTED
;
1743 "Marking (%s) as ondemand, flags %d",
1749 /* Store both the old and the new runlevel. */
1750 wrote_utmp_rlevel
= 0;
1751 wrote_wtmp_rlevel
= 0;
1752 write_utmp_wtmp("runlevel", "~~", foo
+ 256*runlevel
, RUN_LVL
, "~");
1754 prevlevel
= runlevel
;
1760 * This procedure is called after every signal (SIGHUP, SIGALRM..)
1762 * Only clear the 'failing' flag if the process is sleeping
1763 * longer than 5 minutes, or inittab was read again due
1764 * to user interaction.
1766 void fail_check(void)
1768 CHILD
*ch
; /* Pointer to child structure */
1769 time_t t
; /* System time */
1770 time_t next_alarm
= 0; /* When to set next alarm */
1774 for(ch
= family
; ch
; ch
= ch
->next
) {
1776 if (ch
->flags
& FAILING
) {
1777 /* Can we free this sucker? */
1778 if (ch
->tm
+ SLEEPTIME
< t
) {
1779 ch
->flags
&= ~FAILING
;
1783 /* No, we'll look again later */
1784 if (next_alarm
== 0 ||
1785 ch
->tm
+ SLEEPTIME
> next_alarm
)
1786 next_alarm
= ch
->tm
+ SLEEPTIME
;
1792 if (next_alarm
< 1) next_alarm
= 1;
1797 /* Set all 'Fail' timers to 0 */
1798 void fail_cancel(void)
1802 for(ch
= family
; ch
; ch
= ch
->next
) {
1805 ch
->flags
&= ~FAILING
;
1810 * Start up powerfail entries.
1812 void do_power_fail(int pwrstat
)
1817 * Tell powerwait & powerfail entries to start up
1819 for (ch
= family
; ch
; ch
= ch
->next
) {
1820 if (pwrstat
== 'O') {
1822 * The power is OK again.
1824 if (ch
->action
== POWEROKWAIT
)
1825 ch
->flags
&= ~XECUTED
;
1826 } else if (pwrstat
== 'L') {
1828 * Low battery, shut down now.
1830 if (ch
->action
== POWERFAILNOW
)
1831 ch
->flags
&= ~XECUTED
;
1834 * Power is failing, shutdown imminent
1836 if (ch
->action
== POWERFAIL
|| ch
->action
== POWERWAIT
)
1837 ch
->flags
&= ~XECUTED
;
1843 * Check for state-pipe presence
1845 int check_pipe(int fd
)
1853 t
.tv_sec
= t
.tv_usec
= 0;
1855 if (select(fd
+1, &s
, NULL
, NULL
, &t
) != 1)
1857 if (read(fd
, signature
, 8) != 8)
1859 return strncmp(Signature
, signature
, 8) == 0;
1863 * Make a state-pipe.
1865 int make_pipe(int fd
)
1872 fcntl(fds
[1], F_SETFD
, 1);
1873 fcntl(fd
, F_SETFD
, 0);
1874 write(fds
[1], Signature
, 8);
1880 * Attempt to re-exec.
1885 sigset_t mask
, oldset
;
1890 if (strchr("S0123456",runlevel
) == NULL
)
1894 * Reset the alarm, and block all signals.
1898 sigprocmask(SIG_BLOCK
, &mask
, &oldset
);
1901 * construct a pipe fd --> STATE_PIPE and write a signature
1903 fd
= make_pipe(STATE_PIPE
);
1906 * It's a backup day today, so I'm pissed off. Being a BOFH, however,
1907 * does have it's advantages...
1912 DELSET(got_signals
, SIGCHLD
);
1913 DELSET(got_signals
, SIGHUP
);
1914 DELSET(got_signals
, SIGUSR1
);
1917 * That should be cleaned.
1919 for(ch
= family
; ch
; ch
= ch
->next
)
1920 if (ch
->flags
& ZOMBIE
) {
1921 INITDBG(L_VB
, "Child died, PID= %d", ch
->pid
);
1922 ch
->flags
&= ~(RUNNING
|ZOMBIE
|WAITING
);
1923 if (ch
->process
[0] != '+')
1924 write_utmp_wtmp("", ch
->id
, ch
->pid
, DEAD_PROCESS
, NULL
);
1927 if ((pid
= fork()) == 0) {
1929 * Child sends state information to the parent.
1936 * The existing init process execs a new init binary.
1938 env
= init_buildenv(0);
1939 execle(myname
, myname
, "--init", NULL
, env
);
1942 * We shouldn't be here, something failed.
1943 * Bitch, close the state pipe, unblock signals and return.
1947 sigprocmask(SIG_SETMASK
, &oldset
, NULL
);
1949 initlog(L_CO
, "Attempt to re-exec failed");
1953 * Redo utmp/wtmp entries if required or requested
1954 * Check for written records and size of utmp
1957 void redo_utmp_wtmp(void)
1960 const int ret
= stat(UTMP_FILE
, &ustat
);
1962 if ((ret
< 0) || (ustat
.st_size
== 0))
1963 wrote_utmp_rlevel
= wrote_utmp_reboot
= 0;
1965 if ((wrote_wtmp_reboot
== 0) || (wrote_utmp_reboot
== 0))
1966 write_utmp_wtmp("reboot", "~~", 0, BOOT_TIME
, "~");
1968 if ((wrote_wtmp_rlevel
== 0) || (wrote_wtmp_rlevel
== 0))
1969 write_utmp_wtmp("runlevel", "~~", thislevel
+ 256 * prevlevel
, RUN_LVL
, "~");
1973 * We got a change runlevel request through the
1974 * init.fifo. Process it.
1976 void fifo_new_level(int level
)
1983 if (level
== runlevel
) return;
1986 /* Are we waiting for a child? */
1987 for(ch
= family
; ch
; ch
= ch
->next
)
1988 if (ch
->flags
& WAITING
) break;
1992 /* We need to go into a new runlevel */
1993 oldlevel
= runlevel
;
1994 runlevel
= read_level(level
);
1995 if (runlevel
== 'U') {
1996 runlevel
= oldlevel
;
1999 if (oldlevel
!= 'S' && runlevel
== 'S') console_stty();
2000 if (runlevel
== '6' || runlevel
== '0' ||
2001 runlevel
== '1') console_stty();
2002 if (runlevel
> '1' && runlevel
< '6') redo_utmp_wtmp();
2005 setproctitle("init [%c]", runlevel
);
2012 * Set/unset environment variables. The variables are
2013 * encoded as KEY=VAL\0KEY=VAL\0\0. With "=VAL" it means
2014 * setenv, without it means unsetenv.
2016 void initcmd_setenv(char *data
, int size
)
2018 char *env
, *p
, *e
, *eq
;
2023 while (*data
&& data
< e
) {
2025 for (p
= data
; *p
&& p
< e
; p
++)
2026 if (*p
== '=') eq
= p
;
2031 sz
= eq
? (eq
- env
) : (p
- env
);
2033 /*initlog(L_SY, "init_setenv: %s, %s, %d", env, eq, sz);*/
2036 * We only allow INIT_* to be set.
2038 if (strncmp(env
, "INIT_", 5) != 0)
2041 /* Free existing vars. */
2042 for (i
= 0; i
< NR_EXTRA_ENV
; i
++) {
2043 if (extra_env
[i
] == NULL
) continue;
2044 if (!strncmp(extra_env
[i
], env
, sz
) &&
2045 extra_env
[i
][sz
] == '=') {
2047 extra_env
[i
] = NULL
;
2051 /* Set new vars if needed. */
2052 if (eq
== NULL
) continue;
2053 for (i
= 0; i
< NR_EXTRA_ENV
; i
++) {
2054 if (extra_env
[i
] == NULL
) {
2055 extra_env
[i
] = istrdup(env
);
2064 * Read from the init FIFO. Processes like telnetd and rlogind can
2065 * ask us to create login processes on their behalf.
2067 * FIXME: this needs to be finished. NOT that it is buggy, but we need
2068 * to add the telnetd/rlogind stuff so people can start using it.
2069 * Maybe move to using an AF_UNIX socket so we can use
2070 * the 2.2 kernel credential stuff to see who we're talking to.
2073 void check_init_fifo(void)
2075 struct init_request request
;
2077 struct stat st
, st2
;
2083 * First, try to create /dev/initctl if not present.
2085 if (stat(INIT_FIFO
, &st2
) < 0 && errno
== ENOENT
)
2086 (void)mkfifo(INIT_FIFO
, 0600);
2089 * If /dev/initctl is open, stat the file to see if it
2090 * is still the _same_ inode.
2093 fstat(pipe_fd
, &st
);
2094 if (stat(INIT_FIFO
, &st2
) < 0 ||
2095 st
.st_dev
!= st2
.st_dev
||
2096 st
.st_ino
!= st2
.st_ino
) {
2103 * Now finally try to open /dev/initctl
2106 if ((pipe_fd
= open(INIT_FIFO
, O_RDWR
|O_NONBLOCK
)) >= 0) {
2107 fstat(pipe_fd
, &st
);
2108 if (!S_ISFIFO(st
.st_mode
)) {
2109 initlog(L_VB
, "%s is not a fifo", INIT_FIFO
);
2116 * Don't use fd's 0, 1 or 2.
2118 (void) dup2(pipe_fd
, PIPE_FD
);
2123 * Return to caller - we'll be back later.
2128 /* Wait for data to appear, _if_ the pipe was opened. */
2129 if (pipe_fd
>= 0) while(!quit
) {
2131 /* Do select, return on EINTR. */
2133 FD_SET(pipe_fd
, &fds
);
2136 n
= select(pipe_fd
+ 1, &fds
, NULL
, NULL
, &tv
);
2138 if (n
== 0 || errno
== EINTR
) return;
2142 /* Read the data, return on EINTR. */
2143 n
= read(pipe_fd
, &request
, sizeof(request
));
2146 * End of file. This can't happen under Linux (because
2147 * the pipe is opened O_RDWR - see select() in the
2148 * kernel) but you never know...
2155 if (errno
== EINTR
) return;
2156 initlog(L_VB
, "error reading initrequest");
2161 * This is a convenient point to also try to
2162 * find the console device or check if it changed.
2169 if (request
.magic
!= INIT_MAGIC
|| n
!= sizeof(request
)) {
2170 initlog(L_VB
, "got bogus initrequest");
2173 switch(request
.cmd
) {
2174 case INIT_CMD_RUNLVL
:
2175 sltime
= request
.sleeptime
;
2176 fifo_new_level(request
.runlevel
);
2179 case INIT_CMD_POWERFAIL
:
2180 sltime
= request
.sleeptime
;
2184 case INIT_CMD_POWERFAILNOW
:
2185 sltime
= request
.sleeptime
;
2189 case INIT_CMD_POWEROK
:
2190 sltime
= request
.sleeptime
;
2194 case INIT_CMD_SETENV
:
2195 initcmd_setenv(request
.i
.data
, sizeof(request
.i
.data
));
2198 initlog(L_VB
, "got unimplemented initrequest.");
2204 * We come here if the pipe couldn't be opened.
2206 if (pipe_fd
< 0) pause();
2212 * This function is used in the transition
2213 * sysinit (-> single user) boot -> multi-user.
2215 void boot_transitions()
2218 static int newlevel
= 0;
2219 static int warn
= 1;
2223 /* Check if there is something to wait for! */
2224 for( ch
= family
; ch
; ch
= ch
->next
)
2225 if ((ch
->flags
& RUNNING
) && ch
->action
!= BOOT
) break;
2228 /* No processes left in this level, proceed to next level. */
2232 case '#': /* SYSINIT -> BOOT */
2233 INITDBG(L_VB
, "SYSINIT -> BOOT");
2235 /* Write a boot record. */
2236 wrote_utmp_reboot
= 0;
2237 wrote_wtmp_reboot
= 0;
2238 write_utmp_wtmp("reboot", "~~", 0, BOOT_TIME
, "~");
2240 /* Get our run level */
2241 newlevel
= dfl_level
? dfl_level
: get_init_default();
2242 if (newlevel
== 'S') {
2243 runlevel
= newlevel
;
2244 /* Not really 'S' but show anyway. */
2245 setproctitle("init [S]");
2249 case '*': /* BOOT -> NORMAL */
2250 INITDBG(L_VB
, "BOOT -> NORMAL");
2251 if (runlevel
!= newlevel
)
2252 loglevel
= newlevel
;
2253 runlevel
= newlevel
;
2257 case 'S': /* Ended SU mode */
2259 INITDBG(L_VB
, "END SU MODE");
2260 newlevel
= get_init_default();
2261 if (!did_boot
&& newlevel
!= 'S')
2264 if (runlevel
!= newlevel
)
2265 loglevel
= newlevel
;
2266 runlevel
= newlevel
;
2270 for(ch
= family
; ch
; ch
= ch
->next
)
2271 if (strcmp(ch
->rlevel
, "S") == 0)
2272 ch
->flags
&= ~(FAILING
|WAITING
|XECUTED
);
2277 "no more processes left in this runlevel");
2280 if (got_signals
== 0)
2285 initlog(L_VB
, "Entering runlevel: %c", runlevel
);
2286 wrote_utmp_rlevel
= 0;
2287 wrote_wtmp_rlevel
= 0;
2288 write_utmp_wtmp("runlevel", "~~", runlevel
+ 256 * oldlevel
, RUN_LVL
, "~");
2289 thislevel
= runlevel
;
2290 prevlevel
= oldlevel
;
2291 setproctitle("init [%c]", runlevel
);
2297 * Init got hit by a signal. See which signal it is,
2298 * and act accordingly.
2300 void process_signals()
2308 if (ISMEMBER(got_signals
, SIGPWR
)) {
2309 INITDBG(L_VB
, "got SIGPWR");
2310 /* See _what_ kind of SIGPWR this is. */
2312 if ((fd
= open(PWRSTAT
, O_RDONLY
)) >= 0) {
2319 do_power_fail(pwrstat
);
2320 DELSET(got_signals
, SIGPWR
);
2323 if (ISMEMBER(got_signals
, SIGINT
)) {
2324 INITDBG(L_VB
, "got SIGINT");
2325 /* Tell ctrlaltdel entry to start up */
2326 for(ch
= family
; ch
; ch
= ch
->next
)
2327 if (ch
->action
== CTRLALTDEL
)
2328 ch
->flags
&= ~XECUTED
;
2329 DELSET(got_signals
, SIGINT
);
2332 if (ISMEMBER(got_signals
, SIGWINCH
)) {
2333 INITDBG(L_VB
, "got SIGWINCH");
2334 /* Tell kbrequest entry to start up */
2335 for(ch
= family
; ch
; ch
= ch
->next
)
2336 if (ch
->action
== KBREQUEST
)
2337 ch
->flags
&= ~XECUTED
;
2338 DELSET(got_signals
, SIGWINCH
);
2341 if (ISMEMBER(got_signals
, SIGALRM
)) {
2342 INITDBG(L_VB
, "got SIGALRM");
2343 /* The timer went off: check it out */
2344 DELSET(got_signals
, SIGALRM
);
2347 if (ISMEMBER(got_signals
, SIGCHLD
)) {
2348 INITDBG(L_VB
, "got SIGCHLD");
2349 /* First set flag to 0 */
2350 DELSET(got_signals
, SIGCHLD
);
2352 /* See which child this was */
2353 for(ch
= family
; ch
; ch
= ch
->next
)
2354 if (ch
->flags
& ZOMBIE
) {
2355 INITDBG(L_VB
, "Child died, PID= %d", ch
->pid
);
2356 ch
->flags
&= ~(RUNNING
|ZOMBIE
|WAITING
);
2357 if (ch
->process
[0] != '+')
2358 write_utmp_wtmp("", ch
->id
, ch
->pid
, DEAD_PROCESS
, NULL
);
2363 if (ISMEMBER(got_signals
, SIGHUP
)) {
2364 INITDBG(L_VB
, "got SIGHUP");
2366 /* Are we waiting for a child? */
2367 for(ch
= family
; ch
; ch
= ch
->next
)
2368 if (ch
->flags
& WAITING
) break;
2372 /* We need to go into a new runlevel */
2373 oldlevel
= runlevel
;
2375 runlevel
= read_level(0);
2377 if (runlevel
== 'U') {
2378 runlevel
= oldlevel
;
2381 if (oldlevel
!= 'S' && runlevel
== 'S') console_stty();
2382 if (runlevel
== '6' || runlevel
== '0' ||
2383 runlevel
== '1') console_stty();
2386 setproctitle("init [%c]", runlevel
);
2387 DELSET(got_signals
, SIGHUP
);
2391 if (ISMEMBER(got_signals
, SIGUSR1
)) {
2393 * SIGUSR1 means close and reopen /dev/initctl
2395 INITDBG(L_VB
, "got SIGUSR1");
2398 DELSET(got_signals
, SIGUSR1
);
2408 struct sigaction sa
;
2417 * Fork so we can debug the init process.
2419 if ((f
= fork()) > 0) {
2420 static const char killmsg
[] = "PRNT: init killed.\r\n";
2423 while((rc
= wait(&st
)) != f
)
2424 if (rc
< 0 && errno
== ECHILD
)
2426 write(1, killmsg
, sizeof(killmsg
) - 1);
2433 * Tell the kernel to send us SIGINT when CTRL-ALT-DEL
2434 * is pressed, and that we want to handle keyboard signals.
2436 init_reboot(BMAGIC_SOFT
);
2437 if ((f
= open(VT_MASTER
, O_RDWR
| O_NOCTTY
)) >= 0) {
2438 (void) ioctl(f
, KDSIGACCEPT
, SIGWINCH
);
2441 (void) ioctl(0, KDSIGACCEPT
, SIGWINCH
);
2445 * Ignore all signals.
2447 for(f
= 1; f
<= NSIG
; f
++)
2448 SETSIG(sa
, f
, SIG_IGN
, SA_RESTART
);
2451 SETSIG(sa
, SIGALRM
, signal_handler
, 0);
2452 SETSIG(sa
, SIGHUP
, signal_handler
, 0);
2453 SETSIG(sa
, SIGINT
, signal_handler
, 0);
2454 SETSIG(sa
, SIGCHLD
, chld_handler
, SA_RESTART
);
2455 SETSIG(sa
, SIGPWR
, signal_handler
, 0);
2456 SETSIG(sa
, SIGWINCH
, signal_handler
, 0);
2457 SETSIG(sa
, SIGUSR1
, signal_handler
, 0);
2458 SETSIG(sa
, SIGSTOP
, stop_handler
, SA_RESTART
);
2459 SETSIG(sa
, SIGTSTP
, stop_handler
, SA_RESTART
);
2460 SETSIG(sa
, SIGCONT
, cont_handler
, SA_RESTART
);
2461 SETSIG(sa
, SIGSEGV
, (void (*)(int))segv_handler
, SA_RESTART
);
2468 /* Close whatever files are open, and reset the console. */
2476 * Set default PATH variable.
2478 setenv("PATH", PATH_DEFAULT
, 1 /* Overwrite */);
2481 * Initialize /var/run/utmp (only works if /var is on
2482 * root and mounted rw)
2484 if ((fd
= open(UTMP_FILE
, O_WRONLY
|O_CREAT
|O_TRUNC
, 0644)) >= 0)
2488 * Say hello to the world
2490 initlog(L_CO
, bootmsg
, "booting");
2493 * See if we have to start an emergency shell.
2496 SETSIG(sa
, SIGCHLD
, SIG_DFL
, SA_RESTART
);
2497 if (spawn(&ch_emerg
, &f
) > 0) {
2498 while((rc
= wait(&st
)) != f
)
2499 if (rc
< 0 && errno
== ECHILD
)
2502 SETSIG(sa
, SIGCHLD
, chld_handler
, SA_RESTART
);
2506 * Start normal boot procedure.
2513 * Restart: unblock signals and let the show go on
2515 initlog(L_CO
, bootmsg
, "reloading");
2517 sigprocmask(SIG_UNBLOCK
, &sgt
, NULL
);
2520 * Set default PATH variable.
2522 setenv("PATH", PATH_DEFAULT
, 0 /* Don't overwrite */);
2528 /* See if we need to make the boot transitions. */
2530 INITDBG(L_VB
, "init_main: waiting..");
2532 /* Check if there are processes to be waited on. */
2533 for(ch
= family
; ch
; ch
= ch
->next
)
2534 if ((ch
->flags
& RUNNING
) && ch
->action
!= BOOT
) break;
2537 /* Wait until we get hit by some signal. */
2538 while (ch
!= NULL
&& got_signals
== 0) {
2539 if (ISMEMBER(got_signals
, SIGHUP
)) {
2540 /* See if there are processes to be waited on. */
2541 for(ch
= family
; ch
; ch
= ch
->next
)
2542 if (ch
->flags
& WAITING
) break;
2544 if (ch
!= NULL
) check_init_fifo();
2546 #else /* CHANGE_WAIT */
2547 if (ch
!= NULL
&& got_signals
== 0) check_init_fifo();
2548 #endif /* CHANGE_WAIT */
2550 /* Check the 'failing' flags */
2553 /* Process any signals. */
2556 /* See what we need to start up (again) */
2563 * Tell the user about the syntax we expect.
2567 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
);
2571 int telinit(char *progname
, int argc
, char **argv
)
2573 #ifdef TELINIT_USES_INITLVL
2576 struct init_request request
;
2577 struct sigaction sa
;
2581 memset(&request
, 0, sizeof(request
));
2582 request
.magic
= INIT_MAGIC
;
2584 while ((f
= getopt(argc
, argv
, "t:e:")) != EOF
) switch(f
) {
2586 sltime
= atoi(optarg
);
2590 env
= request
.i
.data
;
2592 if (env
+ l
+ 2 > request
.i
.data
+ sizeof(request
.i
.data
)) {
2593 fprintf(stderr
, "%s: -e option data "
2594 "too large\n", progname
);
2597 memcpy(env
, optarg
, l
);
2606 if (env
) *env
++ = 0;
2611 request
.cmd
= INIT_CMD_SETENV
;
2613 if (argc
- optind
!= 1 || strlen(argv
[optind
]) != 1)
2615 if (!strchr("0123456789SsQqAaBbCcUu", argv
[optind
][0]))
2617 request
.cmd
= INIT_CMD_RUNLVL
;
2618 request
.runlevel
= env
? 0 : argv
[optind
][0];
2619 request
.sleeptime
= sltime
;
2622 /* Open the fifo and write a command. */
2623 /* Make sure we don't hang on opening /dev/initctl */
2624 SETSIG(sa
, SIGALRM
, signal_handler
, 0);
2626 if ((fd
= open(INIT_FIFO
, O_WRONLY
)) >= 0 &&
2627 write(fd
, &request
, sizeof(request
)) == sizeof(request
)) {
2633 #ifdef TELINIT_USES_INITLVL
2634 if (request
.cmd
== INIT_CMD_RUNLVL
) {
2635 /* Fallthrough to the old method. */
2637 /* Now write the new runlevel. */
2638 if ((fp
= fopen(INITLVL
, "w")) == NULL
) {
2639 fprintf(stderr
, "%s: cannot create %s\n",
2643 fprintf(fp
, "%s %d", argv
[optind
], sltime
);
2646 /* And tell init about the pending runlevel change. */
2647 if (kill(INITPID
, SIGHUP
) < 0) perror(progname
);
2653 fprintf(stderr
, "%s: ", progname
);
2654 if (ISMEMBER(got_signals
, SIGALRM
)) {
2655 fprintf(stderr
, "timeout opening/writing control channel %s\n",
2664 * Main entry for init and telinit.
2666 int main(int argc
, char **argv
)
2675 /* Get my own name */
2676 if ((p
= strrchr(argv
[0], '/')) != NULL
)
2683 if (geteuid() != 0) {
2684 fprintf(stderr
, "%s: must be superuser.\n", p
);
2689 * Is this telinit or init ?
2691 isinit
= (getpid() == 1);
2692 for (f
= 1; f
< argc
; f
++) {
2693 if (!strcmp(argv
[f
], "-i") || !strcmp(argv
[f
], "--init")) {
2698 if (!isinit
) exit(telinit(p
, argc
, argv
));
2703 if (check_pipe(STATE_PIPE
)) {
2705 receive_state(STATE_PIPE
);
2707 myname
= istrdup(argv
[0]);
2710 for (f
= 0; f
< argc
; f
++)
2711 maxproclen
+= strlen(argv
[f
]) + 1;
2713 setproctitle("init [%c]",runlevel
);
2718 /* Check command line arguments */
2719 maxproclen
= strlen(argv
[0]) + 1;
2720 for(f
= 1; f
< argc
; f
++) {
2721 if (!strcmp(argv
[f
], "single") || !strcmp(argv
[f
], "-s"))
2723 else if (!strcmp(argv
[f
], "-a") || !strcmp(argv
[f
], "auto"))
2724 putenv("AUTOBOOT=YES");
2725 else if (!strcmp(argv
[f
], "-b") || !strcmp(argv
[f
],"emergency"))
2727 else if (!strcmp(argv
[f
], "-z")) {
2729 if (argv
[f
+ 1]) f
++;
2730 } else if (strchr("0123456789sS", argv
[f
][0])
2731 && strlen(argv
[f
]) == 1)
2732 dfl_level
= argv
[f
][0];
2733 /* "init u" in the very beginning makes no sense */
2734 if (dfl_level
== 's') dfl_level
= 'S';
2735 maxproclen
+= strlen(argv
[f
]) + 1;
2739 if (getenv("SELINUX_INIT") == NULL
&& !is_selinux_enabled()) {
2740 putenv("SELINUX_INIT=YES");
2741 if (selinux_init_load_policy(&enforce
) == 0 ) {
2742 execv(myname
, argv
);
2745 /* SELinux in enforcing mode but load_policy failed */
2746 /* At this point, we probably can't open /dev/console, so log() won't work */
2747 fprintf(stderr
,"Unable to load SELinux Policy. Machine is in enforcing mode. Halting now.\n");
2753 /* Start booting. */
2756 setproctitle("init boot");
2757 init_main(dfl_level
);