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Commit | Line | Data |
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a74aeac6 PR |
1 | /* |
2 | * Init A System-V Init Clone. | |
3 | * | |
4 | * Usage: /sbin/init | |
5 | * init [0123456SsQqAaBbCc] | |
6 | * telinit [0123456SsQqAaBbCc] | |
7 | * | |
8 | * Version: @(#)init.c 2.86 30-Jul-2004 miquels@cistron.nl | |
9 | */ | |
0e6cb480 | 10 | #define VERSION "2.88" |
a74aeac6 PR |
11 | #define DATE "31-Jul-2004" |
12 | /* | |
13 | * This file is part of the sysvinit suite, | |
14 | * Copyright (C) 1991-2004 Miquel van Smoorenburg. | |
15 | * | |
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. | |
20 | * | |
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. | |
25 | * | |
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 | |
29 | * | |
30 | */ | |
31 | ||
32 | #include <sys/types.h> | |
33 | #include <sys/stat.h> | |
34 | #include <sys/ioctl.h> | |
35 | #include <sys/wait.h> | |
36 | #ifdef __linux__ | |
37 | #include <sys/kd.h> | |
38 | #endif | |
39 | #include <sys/resource.h> | |
40 | #include <stdlib.h> | |
41 | #include <unistd.h> | |
42 | #include <errno.h> | |
43 | #include <stdio.h> | |
44 | #include <time.h> | |
45 | #include <fcntl.h> | |
46 | #include <string.h> | |
47 | #include <signal.h> | |
48 | #include <termios.h> | |
49 | #include <utmp.h> | |
50 | #include <ctype.h> | |
51 | #include <stdarg.h> | |
52 | #include <sys/syslog.h> | |
53 | #include <sys/time.h> | |
54 | ||
55 | #ifdef WITH_SELINUX | |
56 | #include <selinux/selinux.h> | |
57 | #endif | |
58 | ||
59 | ||
60 | #ifdef __i386__ | |
5f959b29 | 61 | # ifdef __GLIBC__ |
a74aeac6 PR |
62 | /* GNU libc 2.x */ |
63 | # define STACK_DEBUG 1 | |
64 | # if (__GLIBC__ == 2 && __GLIBC_MINOR__ == 0) | |
65 | /* Only glibc 2.0 needs this */ | |
66 | # include <sigcontext.h> | |
5f959b29 DWF |
67 | # elif ( __GLIBC__ > 2) && ((__GLIBC__ == 2) && (__GLIBC_MINOR__ >= 1)) |
68 | # include <bits/sigcontext.h> | |
a74aeac6 PR |
69 | # endif |
70 | # endif | |
71 | #endif | |
72 | ||
73 | #include "init.h" | |
74 | #include "initreq.h" | |
75 | #include "paths.h" | |
76 | #include "reboot.h" | |
77 | #include "set.h" | |
78 | ||
79 | #ifndef SIGPWR | |
80 | # define SIGPWR SIGUSR2 | |
81 | #endif | |
82 | ||
83 | #ifndef CBAUD | |
84 | # define CBAUD 0 | |
85 | #endif | |
86 | #ifndef CBAUDEX | |
87 | # define CBAUDEX 0 | |
88 | #endif | |
89 | ||
90 | /* Set a signal handler. */ | |
91 | #define SETSIG(sa, sig, fun, flags) \ | |
92 | do { \ | |
93 | sa.sa_handler = fun; \ | |
94 | sa.sa_flags = flags; \ | |
95 | sigemptyset(&sa.sa_mask); \ | |
96 | sigaction(sig, &sa, NULL); \ | |
97 | } while(0) | |
98 | ||
99 | /* Version information */ | |
100 | char *Version = "@(#) init " VERSION " " DATE " miquels@cistron.nl"; | |
101 | char *bootmsg = "version " VERSION " %s"; | |
102 | #define E_VERSION "INIT_VERSION=sysvinit-" VERSION | |
103 | ||
104 | CHILD *family = NULL; /* The linked list of all entries */ | |
105 | CHILD *newFamily = NULL; /* The list after inittab re-read */ | |
106 | ||
107 | CHILD ch_emerg = { /* Emergency shell */ | |
108 | WAITING, 0, 0, 0, 0, | |
109 | "~~", | |
110 | "S", | |
111 | 3, | |
112 | "/sbin/sulogin", | |
113 | NULL, | |
114 | NULL | |
115 | }; | |
116 | ||
117 | char runlevel = 'S'; /* The current run level */ | |
118 | char thislevel = 'S'; /* The current runlevel */ | |
119 | char prevlevel = 'N'; /* Previous runlevel */ | |
120 | int dfl_level = 0; /* Default runlevel */ | |
121 | sig_atomic_t got_cont = 0; /* Set if we received the SIGCONT signal */ | |
122 | sig_atomic_t got_signals; /* Set if we received a signal. */ | |
123 | int emerg_shell = 0; /* Start emergency shell? */ | |
124 | int wrote_wtmp_reboot = 1; /* Set when we wrote the reboot record */ | |
125 | int wrote_utmp_reboot = 1; /* Set when we wrote the reboot record */ | |
63a2c981 DWF |
126 | int wrote_wtmp_rlevel = 1; /* Set when we wrote the runlevel record */ |
127 | int wrote_utmp_rlevel = 1; /* Set when we wrote the runlevel record */ | |
a74aeac6 PR |
128 | int sltime = 5; /* Sleep time between TERM and KILL */ |
129 | char *argv0; /* First arguments; show up in ps listing */ | |
130 | int maxproclen; /* Maximal length of argv[0] with \0 */ | |
131 | struct utmp utproto; /* Only used for sizeof(utproto.ut_id) */ | |
a74aeac6 PR |
132 | char *console_dev; /* Console device. */ |
133 | int pipe_fd = -1; /* /dev/initctl */ | |
134 | int did_boot = 0; /* Did we already do BOOT* stuff? */ | |
135 | int main(int, char **); | |
136 | ||
137 | /* Used by re-exec part */ | |
138 | int reload = 0; /* Should we do initialization stuff? */ | |
139 | char *myname="/sbin/init"; /* What should we exec */ | |
140 | int oops_error; /* Used by some of the re-exec code. */ | |
141 | const char *Signature = "12567362"; /* Signature for re-exec fd */ | |
142 | ||
143 | /* Macro to see if this is a special action */ | |
144 | #define ISPOWER(i) ((i) == POWERWAIT || (i) == POWERFAIL || \ | |
145 | (i) == POWEROKWAIT || (i) == POWERFAILNOW || \ | |
146 | (i) == CTRLALTDEL) | |
147 | ||
148 | /* ascii values for the `action' field. */ | |
149 | struct actions { | |
150 | char *name; | |
151 | int act; | |
152 | } actions[] = { | |
153 | { "respawn", RESPAWN }, | |
154 | { "wait", WAIT }, | |
155 | { "once", ONCE }, | |
156 | { "boot", BOOT }, | |
157 | { "bootwait", BOOTWAIT }, | |
158 | { "powerfail", POWERFAIL }, | |
159 | { "powerfailnow",POWERFAILNOW }, | |
160 | { "powerwait", POWERWAIT }, | |
161 | { "powerokwait", POWEROKWAIT }, | |
162 | { "ctrlaltdel", CTRLALTDEL }, | |
163 | { "off", OFF }, | |
164 | { "ondemand", ONDEMAND }, | |
165 | { "initdefault", INITDEFAULT }, | |
166 | { "sysinit", SYSINIT }, | |
167 | { "kbrequest", KBREQUEST }, | |
168 | { NULL, 0 }, | |
169 | }; | |
170 | ||
171 | /* | |
172 | * State parser token table (see receive_state) | |
173 | */ | |
174 | struct { | |
175 | char name[4]; | |
176 | int cmd; | |
177 | } cmds[] = { | |
178 | { "VER", C_VER }, | |
179 | { "END", C_END }, | |
180 | { "REC", C_REC }, | |
181 | { "EOR", C_EOR }, | |
182 | { "LEV", C_LEV }, | |
183 | { "FL ", C_FLAG }, | |
184 | { "AC ", C_ACTION }, | |
185 | { "CMD", C_PROCESS }, | |
186 | { "PID", C_PID }, | |
187 | { "EXS", C_EXS }, | |
188 | { "-RL", D_RUNLEVEL }, | |
189 | { "-TL", D_THISLEVEL }, | |
190 | { "-PL", D_PREVLEVEL }, | |
191 | { "-SI", D_GOTSIGN }, | |
192 | { "-WR", D_WROTE_WTMP_REBOOT}, | |
193 | { "-WU", D_WROTE_UTMP_REBOOT}, | |
194 | { "-ST", D_SLTIME }, | |
195 | { "-DB", D_DIDBOOT }, | |
63a2c981 DWF |
196 | { "-LW", D_WROTE_WTMP_RLEVEL}, |
197 | { "-LU", D_WROTE_UTMP_RLEVEL}, | |
a74aeac6 PR |
198 | { "", 0 } |
199 | }; | |
200 | struct { | |
201 | char *name; | |
202 | int mask; | |
203 | } flags[]={ | |
204 | {"RU",RUNNING}, | |
205 | {"DE",DEMAND}, | |
206 | {"XD",XECUTED}, | |
207 | {"WT",WAITING}, | |
208 | {NULL,0} | |
209 | }; | |
210 | ||
211 | #define NR_EXTRA_ENV 16 | |
212 | char *extra_env[NR_EXTRA_ENV]; | |
213 | ||
214 | ||
215 | /* | |
216 | * Sleep a number of seconds. | |
217 | * | |
218 | * This only works correctly because the linux select updates | |
219 | * the elapsed time in the struct timeval passed to select! | |
220 | */ | |
5f959b29 | 221 | static |
a74aeac6 PR |
222 | void do_sleep(int sec) |
223 | { | |
224 | struct timeval tv; | |
225 | ||
226 | tv.tv_sec = sec; | |
227 | tv.tv_usec = 0; | |
228 | ||
229 | while(select(0, NULL, NULL, NULL, &tv) < 0 && errno == EINTR) | |
230 | ; | |
231 | } | |
232 | ||
233 | ||
234 | /* | |
235 | * Non-failing allocation routines (init cannot fail). | |
236 | */ | |
5f959b29 | 237 | static |
a74aeac6 PR |
238 | void *imalloc(size_t size) |
239 | { | |
240 | void *m; | |
241 | ||
242 | while ((m = malloc(size)) == NULL) { | |
243 | initlog(L_VB, "out of memory"); | |
244 | do_sleep(5); | |
245 | } | |
246 | memset(m, 0, size); | |
247 | return m; | |
248 | } | |
249 | ||
5f959b29 | 250 | static |
a74aeac6 PR |
251 | char *istrdup(char *s) |
252 | { | |
253 | char *m; | |
254 | int l; | |
255 | ||
256 | l = strlen(s) + 1; | |
257 | m = imalloc(l); | |
258 | memcpy(m, s, l); | |
259 | return m; | |
260 | } | |
261 | ||
262 | ||
263 | /* | |
264 | * Send the state info of the previous running init to | |
265 | * the new one, in a version-independant way. | |
266 | */ | |
5f959b29 | 267 | static |
a74aeac6 PR |
268 | void send_state(int fd) |
269 | { | |
270 | FILE *fp; | |
271 | CHILD *p; | |
272 | int i,val; | |
273 | ||
274 | fp = fdopen(fd,"w"); | |
275 | ||
276 | fprintf(fp, "VER%s\n", Version); | |
277 | fprintf(fp, "-RL%c\n", runlevel); | |
278 | fprintf(fp, "-TL%c\n", thislevel); | |
279 | fprintf(fp, "-PL%c\n", prevlevel); | |
280 | fprintf(fp, "-SI%u\n", got_signals); | |
281 | fprintf(fp, "-WR%d\n", wrote_wtmp_reboot); | |
282 | fprintf(fp, "-WU%d\n", wrote_utmp_reboot); | |
283 | fprintf(fp, "-ST%d\n", sltime); | |
284 | fprintf(fp, "-DB%d\n", did_boot); | |
285 | ||
286 | for (p = family; p; p = p->next) { | |
287 | fprintf(fp, "REC%s\n", p->id); | |
288 | fprintf(fp, "LEV%s\n", p->rlevel); | |
289 | for (i = 0, val = p->flags; flags[i].mask; i++) | |
290 | if (val & flags[i].mask) { | |
291 | val &= ~flags[i].mask; | |
292 | fprintf(fp, "FL %s\n",flags[i].name); | |
293 | } | |
294 | fprintf(fp, "PID%d\n",p->pid); | |
295 | fprintf(fp, "EXS%u\n",p->exstat); | |
296 | for(i = 0; actions[i].act; i++) | |
297 | if (actions[i].act == p->action) { | |
298 | fprintf(fp, "AC %s\n", actions[i].name); | |
299 | break; | |
300 | } | |
301 | fprintf(fp, "CMD%s\n", p->process); | |
302 | fprintf(fp, "EOR\n"); | |
303 | } | |
304 | fprintf(fp, "END\n"); | |
305 | fclose(fp); | |
306 | } | |
307 | ||
308 | /* | |
309 | * Read a string from a file descriptor. | |
310 | * FIXME: why not use fgets() ? | |
311 | */ | |
312 | static int get_string(char *p, int size, FILE *f) | |
313 | { | |
314 | int c; | |
315 | ||
316 | while ((c = getc(f)) != EOF && c != '\n') { | |
317 | if (--size > 0) | |
318 | *p++ = c; | |
319 | } | |
320 | *p = '\0'; | |
321 | return (c != EOF) && (size > 0); | |
322 | } | |
323 | ||
324 | /* | |
325 | * Read trailing data from the state pipe until we see a newline. | |
326 | */ | |
327 | static int get_void(FILE *f) | |
328 | { | |
329 | int c; | |
330 | ||
331 | while ((c = getc(f)) != EOF && c != '\n') | |
332 | ; | |
333 | ||
334 | return (c != EOF); | |
335 | } | |
336 | ||
337 | /* | |
338 | * Read the next "command" from the state pipe. | |
339 | */ | |
340 | static int get_cmd(FILE *f) | |
341 | { | |
342 | char cmd[4] = " "; | |
343 | int i; | |
344 | ||
345 | if (fread(cmd, 1, sizeof(cmd) - 1, f) != sizeof(cmd) - 1) | |
346 | return C_EOF; | |
347 | ||
348 | for(i = 0; cmds[i].cmd && strcmp(cmds[i].name, cmd) != 0; i++) | |
349 | ; | |
350 | return cmds[i].cmd; | |
351 | } | |
352 | ||
353 | /* | |
354 | * Read a CHILD * from the state pipe. | |
355 | */ | |
356 | static CHILD *get_record(FILE *f) | |
357 | { | |
358 | int cmd; | |
359 | char s[32]; | |
360 | int i; | |
361 | CHILD *p; | |
362 | ||
363 | do { | |
364 | switch (cmd = get_cmd(f)) { | |
365 | case C_END: | |
366 | get_void(f); | |
367 | return NULL; | |
368 | case 0: | |
369 | get_void(f); | |
370 | break; | |
371 | case C_REC: | |
372 | break; | |
373 | case D_RUNLEVEL: | |
374 | fscanf(f, "%c\n", &runlevel); | |
375 | break; | |
376 | case D_THISLEVEL: | |
377 | fscanf(f, "%c\n", &thislevel); | |
378 | break; | |
379 | case D_PREVLEVEL: | |
380 | fscanf(f, "%c\n", &prevlevel); | |
381 | break; | |
382 | case D_GOTSIGN: | |
383 | fscanf(f, "%u\n", &got_signals); | |
384 | break; | |
385 | case D_WROTE_WTMP_REBOOT: | |
386 | fscanf(f, "%d\n", &wrote_wtmp_reboot); | |
387 | break; | |
388 | case D_WROTE_UTMP_REBOOT: | |
389 | fscanf(f, "%d\n", &wrote_utmp_reboot); | |
390 | break; | |
391 | case D_SLTIME: | |
392 | fscanf(f, "%d\n", &sltime); | |
393 | break; | |
394 | case D_DIDBOOT: | |
395 | fscanf(f, "%d\n", &did_boot); | |
396 | break; | |
63a2c981 DWF |
397 | case D_WROTE_WTMP_RLEVEL: |
398 | fscanf(f, "%d\n", &wrote_wtmp_rlevel); | |
399 | break; | |
400 | case D_WROTE_UTMP_RLEVEL: | |
401 | fscanf(f, "%d\n", &wrote_utmp_rlevel); | |
402 | break; | |
a74aeac6 PR |
403 | default: |
404 | if (cmd > 0 || cmd == C_EOF) { | |
405 | oops_error = -1; | |
406 | return NULL; | |
407 | } | |
408 | } | |
409 | } while (cmd != C_REC); | |
410 | ||
411 | p = imalloc(sizeof(CHILD)); | |
412 | get_string(p->id, sizeof(p->id), f); | |
413 | ||
414 | do switch(cmd = get_cmd(f)) { | |
415 | case 0: | |
416 | case C_EOR: | |
417 | get_void(f); | |
418 | break; | |
419 | case C_PID: | |
420 | fscanf(f, "%d\n", &(p->pid)); | |
421 | break; | |
422 | case C_EXS: | |
423 | fscanf(f, "%u\n", &(p->exstat)); | |
424 | break; | |
425 | case C_LEV: | |
426 | get_string(p->rlevel, sizeof(p->rlevel), f); | |
427 | break; | |
428 | case C_PROCESS: | |
429 | get_string(p->process, sizeof(p->process), f); | |
430 | break; | |
431 | case C_FLAG: | |
432 | get_string(s, sizeof(s), f); | |
433 | for(i = 0; flags[i].name; i++) { | |
434 | if (strcmp(flags[i].name,s) == 0) | |
435 | break; | |
436 | } | |
437 | p->flags |= flags[i].mask; | |
438 | break; | |
439 | case C_ACTION: | |
440 | get_string(s, sizeof(s), f); | |
441 | for(i = 0; actions[i].name; i++) { | |
442 | if (strcmp(actions[i].name, s) == 0) | |
443 | break; | |
444 | } | |
445 | p->action = actions[i].act ? actions[i].act : OFF; | |
446 | break; | |
447 | default: | |
448 | free(p); | |
449 | oops_error = -1; | |
450 | return NULL; | |
451 | } while( cmd != C_EOR); | |
452 | ||
453 | return p; | |
454 | } | |
455 | ||
456 | /* | |
457 | * Read the complete state info from the state pipe. | |
458 | * Returns 0 on success | |
459 | */ | |
5f959b29 | 460 | static |
a74aeac6 PR |
461 | int receive_state(int fd) |
462 | { | |
463 | FILE *f; | |
464 | char old_version[256]; | |
465 | CHILD **pp; | |
466 | ||
467 | f = fdopen(fd, "r"); | |
468 | ||
469 | if (get_cmd(f) != C_VER) | |
470 | return -1; | |
471 | get_string(old_version, sizeof(old_version), f); | |
472 | oops_error = 0; | |
473 | for (pp = &family; (*pp = get_record(f)) != NULL; pp = &((*pp)->next)) | |
474 | ; | |
475 | fclose(f); | |
476 | return oops_error; | |
477 | } | |
478 | ||
479 | /* | |
480 | * Set the process title. | |
481 | */ | |
482 | #ifdef __GNUC__ | |
483 | __attribute__ ((format (printf, 1, 2))) | |
484 | #endif | |
485 | static int setproctitle(char *fmt, ...) | |
486 | { | |
487 | va_list ap; | |
488 | int len; | |
489 | char buf[256]; | |
490 | ||
491 | buf[0] = 0; | |
492 | ||
493 | va_start(ap, fmt); | |
494 | len = vsnprintf(buf, sizeof(buf), fmt, ap); | |
495 | va_end(ap); | |
496 | ||
497 | if (maxproclen > 1) { | |
498 | memset(argv0, 0, maxproclen); | |
499 | strncpy(argv0, buf, maxproclen - 1); | |
500 | } | |
501 | ||
502 | return len; | |
503 | } | |
504 | ||
505 | /* | |
506 | * Set console_dev to a working console. | |
507 | */ | |
5f959b29 | 508 | static |
a74aeac6 PR |
509 | void console_init(void) |
510 | { | |
511 | int fd; | |
512 | int tried_devcons = 0; | |
513 | int tried_vtmaster = 0; | |
514 | char *s; | |
515 | ||
a33820c3 | 516 | if ((s = getenv("CONSOLE")) != NULL) |
a74aeac6 PR |
517 | console_dev = s; |
518 | else { | |
519 | console_dev = CONSOLE; | |
520 | tried_devcons++; | |
521 | } | |
522 | ||
523 | while ((fd = open(console_dev, O_RDONLY|O_NONBLOCK)) < 0) { | |
524 | if (!tried_devcons) { | |
525 | tried_devcons++; | |
526 | console_dev = CONSOLE; | |
527 | continue; | |
528 | } | |
529 | if (!tried_vtmaster) { | |
530 | tried_vtmaster++; | |
531 | console_dev = VT_MASTER; | |
532 | continue; | |
533 | } | |
534 | break; | |
535 | } | |
536 | if (fd < 0) | |
537 | console_dev = "/dev/null"; | |
538 | else | |
539 | close(fd); | |
540 | } | |
541 | ||
542 | ||
543 | /* | |
544 | * Open the console with retries. | |
545 | */ | |
5f959b29 | 546 | static |
a74aeac6 PR |
547 | int console_open(int mode) |
548 | { | |
549 | int f, fd = -1; | |
550 | int m; | |
551 | ||
552 | /* | |
553 | * Open device in nonblocking mode. | |
554 | */ | |
555 | m = mode | O_NONBLOCK; | |
556 | ||
557 | /* | |
558 | * Retry the open five times. | |
559 | */ | |
560 | for(f = 0; f < 5; f++) { | |
561 | if ((fd = open(console_dev, m)) >= 0) break; | |
562 | usleep(100); | |
563 | } | |
564 | ||
565 | if (fd < 0) return fd; | |
566 | ||
567 | /* | |
568 | * Set original flags. | |
569 | */ | |
570 | if (m != mode) | |
571 | fcntl(fd, F_SETFL, mode); | |
572 | return fd; | |
573 | } | |
574 | ||
575 | /* | |
576 | * We got a signal (HUP PWR WINCH ALRM INT) | |
577 | */ | |
5f959b29 | 578 | static |
a74aeac6 PR |
579 | void signal_handler(int sig) |
580 | { | |
581 | ADDSET(got_signals, sig); | |
582 | } | |
583 | ||
584 | /* | |
585 | * SIGCHLD: one of our children has died. | |
586 | */ | |
5f959b29 DWF |
587 | static |
588 | # ifdef __GNUC__ | |
589 | void chld_handler(int sig __attribute__((unused))) | |
590 | # else | |
591 | void chld_handler(int sig) | |
592 | # endif | |
a74aeac6 PR |
593 | { |
594 | CHILD *ch; | |
595 | int pid, st; | |
596 | int saved_errno = errno; | |
597 | ||
598 | /* | |
599 | * Find out which process(es) this was (were) | |
600 | */ | |
601 | while((pid = waitpid(-1, &st, WNOHANG)) != 0) { | |
602 | if (errno == ECHILD) break; | |
603 | for( ch = family; ch; ch = ch->next ) | |
604 | if ( ch->pid == pid && (ch->flags & RUNNING) ) { | |
605 | INITDBG(L_VB, | |
606 | "chld_handler: marked %d as zombie", | |
607 | ch->pid); | |
608 | ADDSET(got_signals, SIGCHLD); | |
609 | ch->exstat = st; | |
610 | ch->flags |= ZOMBIE; | |
611 | if (ch->new) { | |
612 | ch->new->exstat = st; | |
613 | ch->new->flags |= ZOMBIE; | |
614 | } | |
615 | break; | |
616 | } | |
617 | if (ch == NULL) { | |
618 | INITDBG(L_VB, "chld_handler: unknown child %d exited.", | |
619 | pid); | |
620 | } | |
621 | } | |
622 | errno = saved_errno; | |
623 | } | |
624 | ||
625 | /* | |
626 | * Linux ignores all signals sent to init when the | |
627 | * SIG_DFL handler is installed. Therefore we must catch SIGTSTP | |
628 | * and SIGCONT, or else they won't work.... | |
629 | * | |
630 | * The SIGCONT handler | |
631 | */ | |
5f959b29 DWF |
632 | static |
633 | # ifdef __GNUC__ | |
634 | void cont_handler(int sig __attribute__((unused))) | |
635 | # else | |
636 | void cont_handler(int sig) | |
637 | # endif | |
a74aeac6 PR |
638 | { |
639 | got_cont = 1; | |
640 | } | |
641 | ||
642 | /* | |
643 | * Fork and dump core in /. | |
644 | */ | |
5f959b29 | 645 | static |
a74aeac6 PR |
646 | void coredump(void) |
647 | { | |
648 | static int dumped = 0; | |
649 | struct rlimit rlim; | |
650 | sigset_t mask; | |
651 | ||
652 | if (dumped) return; | |
653 | dumped = 1; | |
654 | ||
655 | if (fork() != 0) return; | |
656 | ||
657 | sigfillset(&mask); | |
658 | sigprocmask(SIG_SETMASK, &mask, NULL); | |
659 | ||
660 | rlim.rlim_cur = RLIM_INFINITY; | |
661 | rlim.rlim_max = RLIM_INFINITY; | |
662 | setrlimit(RLIMIT_CORE, &rlim); | |
663 | chdir("/"); | |
664 | ||
665 | signal(SIGSEGV, SIG_DFL); | |
666 | raise(SIGSEGV); | |
667 | sigdelset(&mask, SIGSEGV); | |
668 | sigprocmask(SIG_SETMASK, &mask, NULL); | |
669 | ||
670 | do_sleep(5); | |
671 | exit(0); | |
672 | } | |
673 | ||
674 | /* | |
675 | * OOPS: segmentation violation! | |
676 | * If we have the info, print where it occured. | |
677 | * Then sleep 30 seconds and try to continue. | |
678 | */ | |
5f959b29 | 679 | static |
a74aeac6 | 680 | #if defined(STACK_DEBUG) && defined(__linux__) |
5f959b29 DWF |
681 | # ifdef __GNUC__ |
682 | void segv_handler(int sig __attribute__((unused)), struct sigcontext ctx) | |
683 | # else | |
a74aeac6 | 684 | void segv_handler(int sig, struct sigcontext ctx) |
5f959b29 | 685 | # endif |
a74aeac6 PR |
686 | { |
687 | char *p = ""; | |
688 | int saved_errno = errno; | |
689 | ||
690 | if ((void *)ctx.eip >= (void *)do_sleep && | |
691 | (void *)ctx.eip < (void *)main) | |
692 | p = " (code)"; | |
693 | initlog(L_VB, "PANIC: segmentation violation at %p%s! " | |
694 | "sleeping for 30 seconds.", (void *)ctx.eip, p); | |
695 | coredump(); | |
696 | do_sleep(30); | |
697 | errno = saved_errno; | |
698 | } | |
699 | #else | |
5f959b29 DWF |
700 | # ifdef __GNUC__ |
701 | void segv_handler(int sig __attribute__((unused))) | |
702 | # else | |
703 | void segv_handler(int sig) | |
704 | # endif | |
a74aeac6 PR |
705 | { |
706 | int saved_errno = errno; | |
707 | ||
708 | initlog(L_VB, | |
709 | "PANIC: segmentation violation! sleeping for 30 seconds."); | |
710 | coredump(); | |
711 | do_sleep(30); | |
712 | errno = saved_errno; | |
713 | } | |
714 | #endif | |
715 | ||
716 | /* | |
717 | * The SIGSTOP & SIGTSTP handler | |
718 | */ | |
5f959b29 DWF |
719 | static |
720 | # ifdef __GNUC__ | |
721 | void stop_handler(int sig __attribute__((unused))) | |
722 | # else | |
723 | void stop_handler(int sig) | |
724 | # endif | |
a74aeac6 PR |
725 | { |
726 | int saved_errno = errno; | |
727 | ||
728 | got_cont = 0; | |
729 | while(!got_cont) pause(); | |
730 | got_cont = 0; | |
731 | errno = saved_errno; | |
732 | } | |
733 | ||
734 | /* | |
735 | * Set terminal settings to reasonable defaults | |
736 | */ | |
5f959b29 | 737 | static |
a74aeac6 PR |
738 | void console_stty(void) |
739 | { | |
740 | struct termios tty; | |
741 | int fd; | |
742 | ||
743 | if ((fd = console_open(O_RDWR|O_NOCTTY)) < 0) { | |
744 | initlog(L_VB, "can't open %s", console_dev); | |
745 | return; | |
746 | } | |
747 | ||
748 | (void) tcgetattr(fd, &tty); | |
749 | ||
750 | tty.c_cflag &= CBAUD|CBAUDEX|CSIZE|CSTOPB|PARENB|PARODD; | |
751 | tty.c_cflag |= HUPCL|CLOCAL|CREAD; | |
752 | ||
5f959b29 DWF |
753 | tty.c_cc[VINTR] = CINTR; |
754 | tty.c_cc[VQUIT] = CQUIT; | |
755 | tty.c_cc[VERASE] = CERASE; /* ASCII DEL (0177) */ | |
756 | tty.c_cc[VKILL] = CKILL; | |
757 | tty.c_cc[VEOF] = CEOF; | |
758 | tty.c_cc[VTIME] = 0; | |
759 | tty.c_cc[VMIN] = 1; | |
760 | tty.c_cc[VSWTC] = _POSIX_VDISABLE; | |
761 | tty.c_cc[VSTART] = CSTART; | |
762 | tty.c_cc[VSTOP] = CSTOP; | |
763 | tty.c_cc[VSUSP] = CSUSP; | |
764 | tty.c_cc[VEOL] = _POSIX_VDISABLE; | |
765 | tty.c_cc[VREPRINT] = CREPRINT; | |
766 | tty.c_cc[VDISCARD] = CDISCARD; | |
767 | tty.c_cc[VWERASE] = CWERASE; | |
768 | tty.c_cc[VLNEXT] = CLNEXT; | |
769 | tty.c_cc[VEOL2] = _POSIX_VDISABLE; | |
a74aeac6 PR |
770 | |
771 | /* | |
772 | * Set pre and post processing | |
773 | */ | |
5f959b29 | 774 | tty.c_iflag = IGNPAR|ICRNL|IXON|IXANY; |
334256b0 | 775 | #ifdef IUTF8 /* Not defined on FreeBSD */ |
5f959b29 | 776 | tty.c_iflag |= IUTF8; |
334256b0 | 777 | #endif /* IUTF8 */ |
a74aeac6 PR |
778 | tty.c_oflag = OPOST|ONLCR; |
779 | tty.c_lflag = ISIG|ICANON|ECHO|ECHOCTL|ECHOPRT|ECHOKE; | |
780 | ||
5f959b29 DWF |
781 | #if defined(SANE_TIO) && (SANE_TIO == 1) |
782 | /* | |
783 | * Disable flow control (-ixon), ignore break (ignbrk), | |
784 | * and make nl/cr more usable (sane). | |
785 | */ | |
786 | tty.c_iflag |= IGNBRK; | |
787 | tty.c_iflag &= ~(BRKINT|INLCR|IGNCR|IXON); | |
788 | tty.c_oflag &= ~(OCRNL|ONLRET); | |
789 | #endif | |
a74aeac6 PR |
790 | /* |
791 | * Now set the terminal line. | |
792 | * We don't care about non-transmitted output data | |
793 | * and non-read input data. | |
794 | */ | |
795 | (void) tcsetattr(fd, TCSANOW, &tty); | |
796 | (void) tcflush(fd, TCIOFLUSH); | |
797 | (void) close(fd); | |
798 | } | |
799 | ||
800 | /* | |
801 | * Print to the system console | |
802 | */ | |
803 | void print(char *s) | |
804 | { | |
805 | int fd; | |
806 | ||
807 | if ((fd = console_open(O_WRONLY|O_NOCTTY|O_NDELAY)) >= 0) { | |
808 | write(fd, s, strlen(s)); | |
809 | close(fd); | |
810 | } | |
811 | } | |
812 | ||
813 | /* | |
814 | * Log something to a logfile and the console. | |
815 | */ | |
816 | #ifdef __GNUC__ | |
817 | __attribute__ ((format (printf, 2, 3))) | |
818 | #endif | |
819 | void initlog(int loglevel, char *s, ...) | |
820 | { | |
821 | va_list va_alist; | |
822 | char buf[256]; | |
823 | sigset_t nmask, omask; | |
824 | ||
825 | va_start(va_alist, s); | |
826 | vsnprintf(buf, sizeof(buf), s, va_alist); | |
827 | va_end(va_alist); | |
828 | ||
829 | if (loglevel & L_SY) { | |
830 | /* | |
831 | * Re-establish connection with syslogd every time. | |
832 | * Block signals while talking to syslog. | |
833 | */ | |
834 | sigfillset(&nmask); | |
835 | sigprocmask(SIG_BLOCK, &nmask, &omask); | |
836 | openlog("init", 0, LOG_DAEMON); | |
837 | syslog(LOG_INFO, "%s", buf); | |
838 | closelog(); | |
839 | sigprocmask(SIG_SETMASK, &omask, NULL); | |
840 | } | |
841 | ||
842 | /* | |
843 | * And log to the console. | |
844 | */ | |
845 | if (loglevel & L_CO) { | |
846 | print("\rINIT: "); | |
847 | print(buf); | |
848 | print("\r\n"); | |
849 | } | |
850 | } | |
851 | ||
852 | ||
853 | /* | |
854 | * Build a new environment for execve(). | |
855 | */ | |
856 | char **init_buildenv(int child) | |
857 | { | |
858 | char i_lvl[] = "RUNLEVEL=x"; | |
859 | char i_prev[] = "PREVLEVEL=x"; | |
860 | char i_cons[32]; | |
5f959b29 | 861 | char i_shell[] = "SHELL=" SHELL; |
a74aeac6 PR |
862 | char **e; |
863 | int n, i; | |
864 | ||
865 | for (n = 0; environ[n]; n++) | |
866 | ; | |
867 | n += NR_EXTRA_ENV + 8; | |
868 | e = calloc(n, sizeof(char *)); | |
869 | ||
870 | for (n = 0; environ[n]; n++) | |
871 | e[n] = istrdup(environ[n]); | |
872 | ||
873 | for (i = 0; i < NR_EXTRA_ENV; i++) | |
874 | if (extra_env[i]) | |
875 | e[n++] = istrdup(extra_env[i]); | |
876 | ||
877 | if (child) { | |
878 | snprintf(i_cons, sizeof(i_cons), "CONSOLE=%s", console_dev); | |
879 | i_lvl[9] = thislevel; | |
880 | i_prev[10] = prevlevel; | |
5f959b29 | 881 | e[n++] = istrdup(i_shell); |
a74aeac6 PR |
882 | e[n++] = istrdup(i_lvl); |
883 | e[n++] = istrdup(i_prev); | |
884 | e[n++] = istrdup(i_cons); | |
885 | e[n++] = istrdup(E_VERSION); | |
886 | } | |
887 | ||
888 | e[n++] = NULL; | |
889 | ||
890 | return e; | |
891 | } | |
892 | ||
893 | ||
894 | void init_freeenv(char **e) | |
895 | { | |
896 | int n; | |
897 | ||
898 | for (n = 0; e[n]; n++) | |
899 | free(e[n]); | |
900 | free(e); | |
901 | } | |
902 | ||
903 | ||
904 | /* | |
905 | * Fork and execute. | |
906 | * | |
907 | * This function is too long and indents too deep. | |
908 | * | |
909 | */ | |
5f959b29 | 910 | static |
a74aeac6 PR |
911 | int spawn(CHILD *ch, int *res) |
912 | { | |
913 | char *args[16]; /* Argv array */ | |
914 | char buf[136]; /* Line buffer */ | |
915 | int f, st, rc; /* Scratch variables */ | |
916 | char *ptr; /* Ditto */ | |
917 | time_t t; /* System time */ | |
918 | int oldAlarm; /* Previous alarm value */ | |
919 | char *proc = ch->process; /* Command line */ | |
920 | pid_t pid, pgrp; /* child, console process group. */ | |
921 | sigset_t nmask, omask; /* For blocking SIGCHLD */ | |
922 | struct sigaction sa; | |
923 | ||
924 | *res = -1; | |
925 | buf[sizeof(buf) - 1] = 0; | |
926 | ||
927 | /* Skip '+' if it's there */ | |
928 | if (proc[0] == '+') proc++; | |
929 | ||
930 | ch->flags |= XECUTED; | |
931 | ||
932 | if (ch->action == RESPAWN || ch->action == ONDEMAND) { | |
933 | /* Is the date stamp from less than 2 minutes ago? */ | |
934 | time(&t); | |
935 | if (ch->tm + TESTTIME > t) { | |
936 | ch->count++; | |
937 | } else { | |
938 | ch->count = 0; | |
939 | ch->tm = t; | |
940 | } | |
941 | ||
942 | /* Do we try to respawn too fast? */ | |
943 | if (ch->count >= MAXSPAWN) { | |
944 | ||
945 | initlog(L_VB, | |
946 | "Id \"%s\" respawning too fast: disabled for %d minutes", | |
947 | ch->id, SLEEPTIME / 60); | |
948 | ch->flags &= ~RUNNING; | |
949 | ch->flags |= FAILING; | |
950 | ||
951 | /* Remember the time we stopped */ | |
952 | ch->tm = t; | |
953 | ||
954 | /* Try again in 5 minutes */ | |
955 | oldAlarm = alarm(0); | |
956 | if (oldAlarm > SLEEPTIME || oldAlarm <= 0) oldAlarm = SLEEPTIME; | |
957 | alarm(oldAlarm); | |
958 | return(-1); | |
959 | } | |
960 | } | |
961 | ||
962 | /* See if there is an "initscript" (except in single user mode). */ | |
963 | if (access(INITSCRIPT, R_OK) == 0 && runlevel != 'S') { | |
964 | /* Build command line using "initscript" */ | |
965 | args[1] = SHELL; | |
966 | args[2] = INITSCRIPT; | |
967 | args[3] = ch->id; | |
968 | args[4] = ch->rlevel; | |
969 | args[5] = "unknown"; | |
970 | for(f = 0; actions[f].name; f++) { | |
971 | if (ch->action == actions[f].act) { | |
972 | args[5] = actions[f].name; | |
973 | break; | |
974 | } | |
975 | } | |
976 | args[6] = proc; | |
977 | args[7] = NULL; | |
978 | } else if (strpbrk(proc, "~`!$^&*()=|\\{}[];\"'<>?")) { | |
979 | /* See if we need to fire off a shell for this command */ | |
980 | /* Give command line to shell */ | |
981 | args[1] = SHELL; | |
982 | args[2] = "-c"; | |
983 | strcpy(buf, "exec "); | |
984 | strncat(buf, proc, sizeof(buf) - strlen(buf) - 1); | |
985 | args[3] = buf; | |
986 | args[4] = NULL; | |
987 | } else { | |
988 | /* Split up command line arguments */ | |
989 | buf[0] = 0; | |
990 | strncat(buf, proc, sizeof(buf) - 1); | |
991 | ptr = buf; | |
992 | for(f = 1; f < 15; f++) { | |
993 | /* Skip white space */ | |
994 | while(*ptr == ' ' || *ptr == '\t') ptr++; | |
995 | args[f] = ptr; | |
996 | ||
997 | /* May be trailing space.. */ | |
998 | if (*ptr == 0) break; | |
999 | ||
1000 | /* Skip this `word' */ | |
1001 | while(*ptr && *ptr != ' ' && *ptr != '\t' && *ptr != '#') | |
1002 | ptr++; | |
1003 | ||
1004 | /* If end-of-line, break */ | |
1005 | if (*ptr == '#' || *ptr == 0) { | |
1006 | f++; | |
1007 | *ptr = 0; | |
1008 | break; | |
1009 | } | |
1010 | /* End word with \0 and continue */ | |
1011 | *ptr++ = 0; | |
1012 | } | |
1013 | args[f] = NULL; | |
1014 | } | |
1015 | args[0] = args[1]; | |
1016 | while(1) { | |
1017 | /* | |
1018 | * Block sigchild while forking. | |
1019 | */ | |
1020 | sigemptyset(&nmask); | |
1021 | sigaddset(&nmask, SIGCHLD); | |
1022 | sigprocmask(SIG_BLOCK, &nmask, &omask); | |
1023 | ||
1024 | if ((pid = fork()) == 0) { | |
1025 | ||
1026 | close(0); | |
1027 | close(1); | |
1028 | close(2); | |
1029 | if (pipe_fd >= 0) close(pipe_fd); | |
1030 | ||
1031 | sigprocmask(SIG_SETMASK, &omask, NULL); | |
1032 | ||
90c78fcc PR |
1033 | /* |
1034 | * Update utmp/wtmp file prior to starting | |
1035 | * any child. This MUST be done right here in | |
1036 | * the child process in order to prevent a race | |
1037 | * condition that occurs when the child | |
1038 | * process' time slice executes before the | |
1039 | * parent (can and does happen in a uniprocessor | |
1040 | * environment). If the child is a getty and | |
1041 | * the race condition happens, then init's utmp | |
1042 | * update will happen AFTER the getty runs | |
1043 | * and expects utmp to be updated already! | |
1044 | * | |
1045 | * Do NOT log if process field starts with '+' | |
1046 | * FIXME: that's for compatibility with *very* | |
1047 | * old getties - probably it can be taken out. | |
1048 | */ | |
1049 | if (ch->action == RESPAWN && ch->process[0] != '+') | |
1050 | write_utmp_wtmp("", ch->id, getpid(), INIT_PROCESS, ""); | |
1051 | ||
a74aeac6 PR |
1052 | /* |
1053 | * In sysinit, boot, bootwait or single user mode: | |
1054 | * for any wait-type subprocess we _force_ the console | |
1055 | * to be its controlling tty. | |
1056 | */ | |
1057 | if (strchr("*#sS", runlevel) && ch->flags & WAITING) { | |
1058 | /* | |
1059 | * We fork once extra. This is so that we can | |
1060 | * wait and change the process group and session | |
1061 | * of the console after exit of the leader. | |
1062 | */ | |
1063 | setsid(); | |
1064 | if ((f = console_open(O_RDWR|O_NOCTTY)) >= 0) { | |
1065 | /* Take over controlling tty by force */ | |
1066 | (void)ioctl(f, TIOCSCTTY, 1); | |
1067 | dup(f); | |
1068 | dup(f); | |
1069 | } | |
63a2c981 DWF |
1070 | |
1071 | /* | |
1072 | * 4 Sep 2001, Andrea Arcangeli: | |
1073 | * Fix a race in spawn() that is used to deadlock init in a | |
1074 | * waitpid() loop: must set the childhandler as default before forking | |
1075 | * off the child or the chld_handler could run before the waitpid loop | |
1076 | * has a chance to find its zombie-child. | |
1077 | */ | |
a74aeac6 PR |
1078 | SETSIG(sa, SIGCHLD, SIG_DFL, SA_RESTART); |
1079 | if ((pid = fork()) < 0) { | |
1080 | initlog(L_VB, "cannot fork: %s", | |
1081 | strerror(errno)); | |
1082 | exit(1); | |
1083 | } | |
1084 | if (pid > 0) { | |
1085 | /* | |
1086 | * Ignore keyboard signals etc. | |
1087 | * Then wait for child to exit. | |
1088 | */ | |
1089 | SETSIG(sa, SIGINT, SIG_IGN, SA_RESTART); | |
1090 | SETSIG(sa, SIGTSTP, SIG_IGN, SA_RESTART); | |
1091 | SETSIG(sa, SIGQUIT, SIG_IGN, SA_RESTART); | |
1092 | ||
1093 | while ((rc = waitpid(pid, &st, 0)) != pid) | |
1094 | if (rc < 0 && errno == ECHILD) | |
1095 | break; | |
1096 | ||
1097 | /* | |
1098 | * Small optimization. See if stealing | |
1099 | * controlling tty back is needed. | |
1100 | */ | |
1101 | pgrp = tcgetpgrp(f); | |
1102 | if (pgrp != getpid()) | |
1103 | exit(0); | |
1104 | ||
1105 | /* | |
1106 | * Steal controlling tty away. We do | |
1107 | * this with a temporary process. | |
1108 | */ | |
1109 | if ((pid = fork()) < 0) { | |
1110 | initlog(L_VB, "cannot fork: %s", | |
1111 | strerror(errno)); | |
1112 | exit(1); | |
1113 | } | |
1114 | if (pid == 0) { | |
1115 | setsid(); | |
1116 | (void)ioctl(f, TIOCSCTTY, 1); | |
1117 | exit(0); | |
1118 | } | |
1119 | while((rc = waitpid(pid, &st, 0)) != pid) | |
1120 | if (rc < 0 && errno == ECHILD) | |
1121 | break; | |
1122 | exit(0); | |
1123 | } | |
1124 | ||
1125 | /* Set ioctl settings to default ones */ | |
1126 | console_stty(); | |
1127 | ||
1128 | } else { | |
1129 | setsid(); | |
1130 | if ((f = console_open(O_RDWR|O_NOCTTY)) < 0) { | |
1131 | initlog(L_VB, "open(%s): %s", console_dev, | |
1132 | strerror(errno)); | |
1133 | f = open("/dev/null", O_RDWR); | |
1134 | } | |
1135 | dup(f); | |
1136 | dup(f); | |
1137 | } | |
1138 | ||
1139 | /* Reset all the signals, set up environment */ | |
1140 | for(f = 1; f < NSIG; f++) SETSIG(sa, f, SIG_DFL, SA_RESTART); | |
1141 | environ = init_buildenv(1); | |
1142 | ||
1143 | /* | |
1144 | * Execute prog. In case of ENOEXEC try again | |
1145 | * as a shell script. | |
1146 | */ | |
1147 | execvp(args[1], args + 1); | |
1148 | if (errno == ENOEXEC) { | |
1149 | args[1] = SHELL; | |
1150 | args[2] = "-c"; | |
1151 | strcpy(buf, "exec "); | |
1152 | strncat(buf, proc, sizeof(buf) - strlen(buf) - 1); | |
1153 | args[3] = buf; | |
1154 | args[4] = NULL; | |
1155 | execvp(args[1], args + 1); | |
1156 | } | |
1157 | initlog(L_VB, "cannot execute \"%s\"", args[1]); | |
1158 | exit(1); | |
1159 | } | |
1160 | *res = pid; | |
1161 | sigprocmask(SIG_SETMASK, &omask, NULL); | |
1162 | ||
1163 | INITDBG(L_VB, "Started id %s (pid %d)", ch->id, pid); | |
1164 | ||
1165 | if (pid == -1) { | |
1166 | initlog(L_VB, "cannot fork, retry.."); | |
1167 | do_sleep(5); | |
1168 | continue; | |
1169 | } | |
1170 | return(pid); | |
1171 | } | |
1172 | } | |
1173 | ||
1174 | /* | |
1175 | * Start a child running! | |
1176 | */ | |
5f959b29 | 1177 | static |
a74aeac6 PR |
1178 | void startup(CHILD *ch) |
1179 | { | |
1180 | /* | |
1181 | * See if it's disabled | |
1182 | */ | |
1183 | if (ch->flags & FAILING) return; | |
1184 | ||
1185 | switch(ch->action) { | |
1186 | ||
1187 | case SYSINIT: | |
1188 | case BOOTWAIT: | |
1189 | case WAIT: | |
1190 | case POWERWAIT: | |
1191 | case POWERFAILNOW: | |
1192 | case POWEROKWAIT: | |
1193 | case CTRLALTDEL: | |
1194 | if (!(ch->flags & XECUTED)) ch->flags |= WAITING; | |
1195 | case KBREQUEST: | |
1196 | case BOOT: | |
1197 | case POWERFAIL: | |
1198 | case ONCE: | |
1199 | if (ch->flags & XECUTED) break; | |
1200 | case ONDEMAND: | |
1201 | case RESPAWN: | |
1202 | ch->flags |= RUNNING; | |
90c78fcc | 1203 | (void)spawn(ch, &(ch->pid)); |
a74aeac6 PR |
1204 | break; |
1205 | } | |
1206 | } | |
1207 | ||
1208 | ||
1209 | /* | |
1210 | * Read the inittab file. | |
1211 | */ | |
5f959b29 | 1212 | static |
a74aeac6 PR |
1213 | void read_inittab(void) |
1214 | { | |
1215 | FILE *fp; /* The INITTAB file */ | |
1216 | CHILD *ch, *old, *i; /* Pointers to CHILD structure */ | |
1217 | CHILD *head = NULL; /* Head of linked list */ | |
1218 | #ifdef INITLVL | |
1219 | struct stat st; /* To stat INITLVL */ | |
1220 | #endif | |
1221 | sigset_t nmask, omask; /* For blocking SIGCHLD. */ | |
1222 | char buf[256]; /* Line buffer */ | |
1223 | char err[64]; /* Error message. */ | |
1224 | char *id, *rlevel, | |
1225 | *action, *process; /* Fields of a line */ | |
1226 | char *p; | |
1227 | int lineNo = 0; /* Line number in INITTAB file */ | |
1228 | int actionNo; /* Decoded action field */ | |
1229 | int f; /* Counter */ | |
1230 | int round; /* round 0 for SIGTERM, 1 for SIGKILL */ | |
1231 | int foundOne = 0; /* No killing no sleep */ | |
1232 | int talk; /* Talk to the user */ | |
1233 | int done = 0; /* Ready yet? */ | |
1234 | ||
1235 | #if DEBUG | |
1236 | if (newFamily != NULL) { | |
1237 | INITDBG(L_VB, "PANIC newFamily != NULL"); | |
1238 | exit(1); | |
1239 | } | |
1240 | INITDBG(L_VB, "Reading inittab"); | |
1241 | #endif | |
1242 | ||
1243 | /* | |
1244 | * Open INITTAB and real line by line. | |
1245 | */ | |
1246 | if ((fp = fopen(INITTAB, "r")) == NULL) | |
1247 | initlog(L_VB, "No inittab file found"); | |
1248 | ||
1249 | while(!done) { | |
1250 | /* | |
1251 | * Add single user shell entry at the end. | |
1252 | */ | |
1253 | if (fp == NULL || fgets(buf, sizeof(buf), fp) == NULL) { | |
1254 | done = 1; | |
1255 | /* | |
1256 | * See if we have a single user entry. | |
1257 | */ | |
1258 | for(old = newFamily; old; old = old->next) | |
1259 | if (strpbrk(old->rlevel, "S")) break; | |
1260 | if (old == NULL) | |
1261 | snprintf(buf, sizeof(buf), "~~:S:wait:%s\n", SULOGIN); | |
1262 | else | |
1263 | continue; | |
1264 | } | |
1265 | lineNo++; | |
1266 | /* | |
1267 | * Skip comments and empty lines | |
1268 | */ | |
1269 | for(p = buf; *p == ' ' || *p == '\t'; p++) | |
1270 | ; | |
1271 | if (*p == '#' || *p == '\n') continue; | |
1272 | ||
1273 | /* | |
1274 | * Decode the fields | |
1275 | */ | |
1276 | id = strsep(&p, ":"); | |
1277 | rlevel = strsep(&p, ":"); | |
1278 | action = strsep(&p, ":"); | |
1279 | process = strsep(&p, "\n"); | |
1280 | ||
1281 | /* | |
1282 | * Check if syntax is OK. Be very verbose here, to | |
1283 | * avoid newbie postings on comp.os.linux.setup :) | |
1284 | */ | |
1285 | err[0] = 0; | |
1286 | if (!id || !*id) strcpy(err, "missing id field"); | |
1287 | if (!rlevel) strcpy(err, "missing runlevel field"); | |
1288 | if (!process) strcpy(err, "missing process field"); | |
1289 | if (!action || !*action) | |
1290 | strcpy(err, "missing action field"); | |
1291 | if (id && strlen(id) > sizeof(utproto.ut_id)) | |
1292 | sprintf(err, "id field too long (max %d characters)", | |
1293 | (int)sizeof(utproto.ut_id)); | |
1294 | if (rlevel && strlen(rlevel) > 11) | |
1295 | strcpy(err, "rlevel field too long (max 11 characters)"); | |
1296 | if (process && strlen(process) > 127) | |
1297 | strcpy(err, "process field too long"); | |
1298 | if (action && strlen(action) > 32) | |
1299 | strcpy(err, "action field too long"); | |
1300 | if (err[0] != 0) { | |
1301 | initlog(L_VB, "%s[%d]: %s", INITTAB, lineNo, err); | |
1302 | INITDBG(L_VB, "%s:%s:%s:%s", id, rlevel, action, process); | |
1303 | continue; | |
1304 | } | |
1305 | ||
1306 | /* | |
1307 | * Decode the "action" field | |
1308 | */ | |
1309 | actionNo = -1; | |
1310 | for(f = 0; actions[f].name; f++) | |
1311 | if (strcasecmp(action, actions[f].name) == 0) { | |
1312 | actionNo = actions[f].act; | |
1313 | break; | |
1314 | } | |
1315 | if (actionNo == -1) { | |
1316 | initlog(L_VB, "%s[%d]: %s: unknown action field", | |
1317 | INITTAB, lineNo, action); | |
1318 | continue; | |
1319 | } | |
1320 | ||
1321 | /* | |
1322 | * See if the id field is unique | |
1323 | */ | |
1324 | for(old = newFamily; old; old = old->next) { | |
1325 | if(strcmp(old->id, id) == 0 && strcmp(id, "~~")) { | |
1326 | initlog(L_VB, "%s[%d]: duplicate ID field \"%s\"", | |
1327 | INITTAB, lineNo, id); | |
1328 | break; | |
1329 | } | |
1330 | } | |
1331 | if (old) continue; | |
1332 | ||
1333 | /* | |
1334 | * Allocate a CHILD structure | |
1335 | */ | |
1336 | ch = imalloc(sizeof(CHILD)); | |
1337 | ||
1338 | /* | |
1339 | * And fill it in. | |
1340 | */ | |
1341 | ch->action = actionNo; | |
1342 | strncpy(ch->id, id, sizeof(utproto.ut_id) + 1); /* Hack for different libs. */ | |
1343 | strncpy(ch->process, process, sizeof(ch->process) - 1); | |
1344 | if (rlevel[0]) { | |
192c4567 | 1345 | for(f = 0; f < (int)sizeof(rlevel) - 1 && rlevel[f]; f++) { |
a74aeac6 PR |
1346 | ch->rlevel[f] = rlevel[f]; |
1347 | if (ch->rlevel[f] == 's') ch->rlevel[f] = 'S'; | |
1348 | } | |
1349 | strncpy(ch->rlevel, rlevel, sizeof(ch->rlevel) - 1); | |
1350 | } else { | |
1351 | strcpy(ch->rlevel, "0123456789"); | |
1352 | if (ISPOWER(ch->action)) | |
1353 | strcpy(ch->rlevel, "S0123456789"); | |
1354 | } | |
1355 | /* | |
1356 | * We have the fake runlevel '#' for SYSINIT and | |
1357 | * '*' for BOOT and BOOTWAIT. | |
1358 | */ | |
1359 | if (ch->action == SYSINIT) strcpy(ch->rlevel, "#"); | |
1360 | if (ch->action == BOOT || ch->action == BOOTWAIT) | |
1361 | strcpy(ch->rlevel, "*"); | |
1362 | ||
1363 | /* | |
1364 | * Now add it to the linked list. Special for powerfail. | |
1365 | */ | |
1366 | if (ISPOWER(ch->action)) { | |
1367 | ||
1368 | /* | |
1369 | * Disable by default | |
1370 | */ | |
1371 | ch->flags |= XECUTED; | |
1372 | ||
1373 | /* | |
1374 | * Tricky: insert at the front of the list.. | |
1375 | */ | |
1376 | old = NULL; | |
1377 | for(i = newFamily; i; i = i->next) { | |
1378 | if (!ISPOWER(i->action)) break; | |
1379 | old = i; | |
1380 | } | |
1381 | /* | |
1382 | * Now add after entry "old" | |
1383 | */ | |
1384 | if (old) { | |
1385 | ch->next = i; | |
1386 | old->next = ch; | |
1387 | if (i == NULL) head = ch; | |
1388 | } else { | |
1389 | ch->next = newFamily; | |
1390 | newFamily = ch; | |
1391 | if (ch->next == NULL) head = ch; | |
1392 | } | |
1393 | } else { | |
1394 | /* | |
1395 | * Just add at end of the list | |
1396 | */ | |
1397 | if (ch->action == KBREQUEST) ch->flags |= XECUTED; | |
1398 | ch->next = NULL; | |
1399 | if (head) | |
1400 | head->next = ch; | |
1401 | else | |
1402 | newFamily = ch; | |
1403 | head = ch; | |
1404 | } | |
1405 | ||
1406 | /* | |
1407 | * Walk through the old list comparing id fields | |
1408 | */ | |
1409 | for(old = family; old; old = old->next) | |
1410 | if (strcmp(old->id, ch->id) == 0) { | |
1411 | old->new = ch; | |
1412 | break; | |
1413 | } | |
1414 | } | |
1415 | /* | |
1416 | * We're done. | |
1417 | */ | |
1418 | if (fp) fclose(fp); | |
1419 | ||
1420 | /* | |
1421 | * Loop through the list of children, and see if they need to | |
1422 | * be killed. | |
1423 | */ | |
1424 | ||
1425 | INITDBG(L_VB, "Checking for children to kill"); | |
1426 | for(round = 0; round < 2; round++) { | |
1427 | talk = 1; | |
1428 | for(ch = family; ch; ch = ch->next) { | |
1429 | ch->flags &= ~KILLME; | |
1430 | ||
1431 | /* | |
1432 | * Is this line deleted? | |
1433 | */ | |
1434 | if (ch->new == NULL) ch->flags |= KILLME; | |
1435 | ||
1436 | /* | |
1437 | * If the entry has changed, kill it anyway. Note that | |
1438 | * we do not check ch->process, only the "action" field. | |
1439 | * This way, you can turn an entry "off" immediately, but | |
1440 | * changes in the command line will only become effective | |
1441 | * after the running version has exited. | |
1442 | */ | |
1443 | if (ch->new && ch->action != ch->new->action) ch->flags |= KILLME; | |
1444 | ||
1445 | /* | |
1446 | * Only BOOT processes may live in all levels | |
1447 | */ | |
1448 | if (ch->action != BOOT && | |
1449 | strchr(ch->rlevel, runlevel) == NULL) { | |
1450 | /* | |
1451 | * Ondemand procedures live always, | |
1452 | * except in single user | |
1453 | */ | |
1454 | if (runlevel == 'S' || !(ch->flags & DEMAND)) | |
1455 | ch->flags |= KILLME; | |
1456 | } | |
1457 | ||
1458 | /* | |
1459 | * Now, if this process may live note so in the new list | |
1460 | */ | |
1461 | if ((ch->flags & KILLME) == 0) { | |
1462 | ch->new->flags = ch->flags; | |
1463 | ch->new->pid = ch->pid; | |
1464 | ch->new->exstat = ch->exstat; | |
1465 | continue; | |
1466 | } | |
1467 | ||
1468 | ||
1469 | /* | |
1470 | * Is this process still around? | |
1471 | */ | |
1472 | if ((ch->flags & RUNNING) == 0) { | |
1473 | ch->flags &= ~KILLME; | |
1474 | continue; | |
1475 | } | |
1476 | INITDBG(L_VB, "Killing \"%s\"", ch->process); | |
1477 | switch(round) { | |
1478 | case 0: /* Send TERM signal */ | |
1479 | if (talk) | |
1480 | initlog(L_CO, | |
1481 | "Sending processes the TERM signal"); | |
1482 | kill(-(ch->pid), SIGTERM); | |
1483 | foundOne = 1; | |
1484 | break; | |
1485 | case 1: /* Send KILL signal and collect status */ | |
1486 | if (talk) | |
1487 | initlog(L_CO, | |
1488 | "Sending processes the KILL signal"); | |
1489 | kill(-(ch->pid), SIGKILL); | |
1490 | break; | |
1491 | } | |
1492 | talk = 0; | |
1493 | ||
1494 | } | |
1495 | /* | |
1496 | * See if we have to wait 5 seconds | |
1497 | */ | |
1498 | if (foundOne && round == 0) { | |
1499 | /* | |
1500 | * Yup, but check every second if we still have children. | |
1501 | */ | |
1502 | for(f = 0; f < sltime; f++) { | |
1503 | for(ch = family; ch; ch = ch->next) { | |
1504 | if (!(ch->flags & KILLME)) continue; | |
1505 | if ((ch->flags & RUNNING) && !(ch->flags & ZOMBIE)) | |
1506 | break; | |
1507 | } | |
1508 | if (ch == NULL) { | |
1509 | /* | |
1510 | * No running children, skip SIGKILL | |
1511 | */ | |
1512 | round = 1; | |
1513 | foundOne = 0; /* Skip the sleep below. */ | |
1514 | break; | |
1515 | } | |
1516 | do_sleep(1); | |
1517 | } | |
1518 | } | |
1519 | } | |
1520 | ||
1521 | /* | |
1522 | * Now give all processes the chance to die and collect exit statuses. | |
1523 | */ | |
1524 | if (foundOne) do_sleep(1); | |
1525 | for(ch = family; ch; ch = ch->next) | |
1526 | if (ch->flags & KILLME) { | |
1527 | if (!(ch->flags & ZOMBIE)) | |
1528 | initlog(L_CO, "Pid %d [id %s] seems to hang", ch->pid, | |
1529 | ch->id); | |
1530 | else { | |
1531 | INITDBG(L_VB, "Updating utmp for pid %d [id %s]", | |
1532 | ch->pid, ch->id); | |
1533 | ch->flags &= ~RUNNING; | |
1534 | if (ch->process[0] != '+') | |
1535 | write_utmp_wtmp("", ch->id, ch->pid, DEAD_PROCESS, NULL); | |
1536 | } | |
1537 | } | |
1538 | ||
1539 | /* | |
1540 | * Both rounds done; clean up the list. | |
1541 | */ | |
1542 | sigemptyset(&nmask); | |
1543 | sigaddset(&nmask, SIGCHLD); | |
1544 | sigprocmask(SIG_BLOCK, &nmask, &omask); | |
1545 | for(ch = family; ch; ch = old) { | |
1546 | old = ch->next; | |
1547 | free(ch); | |
1548 | } | |
1549 | family = newFamily; | |
1550 | for(ch = family; ch; ch = ch->next) ch->new = NULL; | |
1551 | newFamily = NULL; | |
1552 | sigprocmask(SIG_SETMASK, &omask, NULL); | |
1553 | ||
1554 | #ifdef INITLVL | |
1555 | /* | |
1556 | * Dispose of INITLVL file. | |
1557 | */ | |
1558 | if (lstat(INITLVL, &st) >= 0 && S_ISLNK(st.st_mode)) { | |
1559 | /* | |
1560 | * INITLVL is a symbolic link, so just truncate the file. | |
1561 | */ | |
1562 | close(open(INITLVL, O_WRONLY|O_TRUNC)); | |
1563 | } else { | |
1564 | /* | |
1565 | * Delete INITLVL file. | |
1566 | */ | |
1567 | unlink(INITLVL); | |
1568 | } | |
1569 | #endif | |
1570 | #ifdef INITLVL2 | |
1571 | /* | |
1572 | * Dispose of INITLVL2 file. | |
1573 | */ | |
1574 | if (lstat(INITLVL2, &st) >= 0 && S_ISLNK(st.st_mode)) { | |
1575 | /* | |
1576 | * INITLVL2 is a symbolic link, so just truncate the file. | |
1577 | */ | |
1578 | close(open(INITLVL2, O_WRONLY|O_TRUNC)); | |
1579 | } else { | |
1580 | /* | |
1581 | * Delete INITLVL2 file. | |
1582 | */ | |
1583 | unlink(INITLVL2); | |
1584 | } | |
1585 | #endif | |
1586 | } | |
1587 | ||
1588 | /* | |
1589 | * Walk through the family list and start up children. | |
1590 | * The entries that do not belong here at all are removed | |
1591 | * from the list. | |
1592 | */ | |
5f959b29 | 1593 | static |
a74aeac6 PR |
1594 | void start_if_needed(void) |
1595 | { | |
1596 | CHILD *ch; /* Pointer to child */ | |
1597 | int delete; /* Delete this entry from list? */ | |
1598 | ||
1599 | INITDBG(L_VB, "Checking for children to start"); | |
1600 | ||
1601 | for(ch = family; ch; ch = ch->next) { | |
1602 | ||
1603 | #if DEBUG | |
1604 | if (ch->rlevel[0] == 'C') { | |
1605 | INITDBG(L_VB, "%s: flags %d", ch->process, ch->flags); | |
1606 | } | |
1607 | #endif | |
1608 | ||
1609 | /* Are we waiting for this process? Then quit here. */ | |
1610 | if (ch->flags & WAITING) break; | |
1611 | ||
1612 | /* Already running? OK, don't touch it */ | |
1613 | if (ch->flags & RUNNING) continue; | |
1614 | ||
1615 | /* See if we have to start it up */ | |
1616 | delete = 1; | |
1617 | if (strchr(ch->rlevel, runlevel) || | |
1618 | ((ch->flags & DEMAND) && !strchr("#*Ss", runlevel))) { | |
1619 | startup(ch); | |
1620 | delete = 0; | |
1621 | } | |
1622 | ||
1623 | if (delete) { | |
1624 | /* FIXME: is this OK? */ | |
1625 | ch->flags &= ~(RUNNING|WAITING); | |
1626 | if (!ISPOWER(ch->action) && ch->action != KBREQUEST) | |
1627 | ch->flags &= ~XECUTED; | |
1628 | ch->pid = 0; | |
1629 | } else | |
1630 | /* Do we have to wait for this process? */ | |
1631 | if (ch->flags & WAITING) break; | |
1632 | } | |
1633 | /* Done. */ | |
1634 | } | |
1635 | ||
1636 | /* | |
1637 | * Ask the user on the console for a runlevel | |
1638 | */ | |
5f959b29 | 1639 | static |
a74aeac6 PR |
1640 | int ask_runlevel(void) |
1641 | { | |
1642 | const char prompt[] = "\nEnter runlevel: "; | |
1643 | char buf[8]; | |
1644 | int lvl = -1; | |
1645 | int fd; | |
1646 | ||
1647 | console_stty(); | |
1648 | fd = console_open(O_RDWR|O_NOCTTY); | |
1649 | ||
1650 | if (fd < 0) return('S'); | |
1651 | ||
1652 | while(!strchr("0123456789S", lvl)) { | |
1653 | write(fd, prompt, sizeof(prompt) - 1); | |
1654 | buf[0] = 0; | |
1655 | read(fd, buf, sizeof(buf)); | |
1656 | if (buf[0] != 0 && (buf[1] == '\r' || buf[1] == '\n')) | |
1657 | lvl = buf[0]; | |
1658 | if (islower(lvl)) lvl = toupper(lvl); | |
1659 | } | |
1660 | close(fd); | |
1661 | return lvl; | |
1662 | } | |
1663 | ||
1664 | /* | |
1665 | * Search the INITTAB file for the 'initdefault' field, with the default | |
1666 | * runlevel. If this fails, ask the user to supply a runlevel. | |
1667 | */ | |
5f959b29 | 1668 | static |
a74aeac6 PR |
1669 | int get_init_default(void) |
1670 | { | |
1671 | CHILD *ch; | |
1672 | int lvl = -1; | |
1673 | char *p; | |
1674 | ||
1675 | /* | |
1676 | * Look for initdefault. | |
1677 | */ | |
1678 | for(ch = family; ch; ch = ch->next) | |
1679 | if (ch->action == INITDEFAULT) { | |
1680 | p = ch->rlevel; | |
1681 | while(*p) { | |
1682 | if (*p > lvl) lvl = *p; | |
1683 | p++; | |
1684 | } | |
1685 | break; | |
1686 | } | |
1687 | /* | |
1688 | * See if level is valid | |
1689 | */ | |
1690 | if (lvl > 0) { | |
1691 | if (islower(lvl)) lvl = toupper(lvl); | |
1692 | if (strchr("0123456789S", lvl) == NULL) { | |
1693 | initlog(L_VB, | |
1694 | "Initdefault level '%c' is invalid", lvl); | |
1695 | lvl = 0; | |
1696 | } | |
1697 | } | |
1698 | /* | |
1699 | * Ask for runlevel on console if needed. | |
1700 | */ | |
1701 | if (lvl <= 0) lvl = ask_runlevel(); | |
1702 | ||
1703 | /* | |
1704 | * Log the fact that we have a runlevel now. | |
1705 | */ | |
1706 | return lvl; | |
1707 | } | |
1708 | ||
1709 | ||
1710 | /* | |
1711 | * We got signaled. | |
1712 | * | |
1713 | * Do actions for the new level. If we are compatible with | |
1714 | * the "old" INITLVL and arg == 0, try to read the new | |
1715 | * runlevel from that file first. | |
1716 | */ | |
5f959b29 | 1717 | static |
a74aeac6 PR |
1718 | int read_level(int arg) |
1719 | { | |
1720 | CHILD *ch; /* Walk through list */ | |
1721 | unsigned char foo = 'X'; /* Contents of INITLVL */ | |
1722 | int ok = 1; | |
1723 | #ifdef INITLVL | |
1724 | FILE *fp; | |
1725 | struct stat stt; | |
1726 | int st; | |
1727 | #endif | |
1728 | ||
1729 | if (arg) foo = arg; | |
1730 | ||
1731 | #ifdef INITLVL | |
1732 | ok = 0; | |
1733 | ||
1734 | if (arg == 0) { | |
1735 | fp = NULL; | |
1736 | if (stat(INITLVL, &stt) != 0 || stt.st_size != 0L) | |
1737 | fp = fopen(INITLVL, "r"); | |
1738 | #ifdef INITLVL2 | |
1739 | if (fp == NULL && | |
1740 | (stat(INITLVL2, &stt) != 0 || stt.st_size != 0L)) | |
1741 | fp = fopen(INITLVL2, "r"); | |
1742 | #endif | |
1743 | if (fp == NULL) { | |
1744 | /* INITLVL file empty or not there - act as 'init q' */ | |
1745 | initlog(L_SY, "Re-reading inittab"); | |
1746 | return(runlevel); | |
1747 | } | |
1748 | ok = fscanf(fp, "%c %d", &foo, &st); | |
1749 | fclose(fp); | |
1750 | } else { | |
1751 | /* We go to the new runlevel passed as an argument. */ | |
1752 | foo = arg; | |
1753 | ok = 1; | |
1754 | } | |
1755 | if (ok == 2) sltime = st; | |
1756 | ||
1757 | #endif /* INITLVL */ | |
1758 | ||
1759 | if (islower(foo)) foo = toupper(foo); | |
1760 | if (ok < 1 || ok > 2 || strchr("QS0123456789ABCU", foo) == NULL) { | |
1761 | initlog(L_VB, "bad runlevel: %c", foo); | |
1762 | return runlevel; | |
1763 | } | |
1764 | ||
1765 | /* Log this action */ | |
1766 | switch(foo) { | |
1767 | case 'S': | |
1768 | initlog(L_VB, "Going single user"); | |
1769 | break; | |
1770 | case 'Q': | |
1771 | initlog(L_SY, "Re-reading inittab"); | |
1772 | break; | |
1773 | case 'A': | |
1774 | case 'B': | |
1775 | case 'C': | |
1776 | initlog(L_SY, | |
1777 | "Activating demand-procedures for '%c'", foo); | |
1778 | break; | |
1779 | case 'U': | |
1780 | initlog(L_SY, "Trying to re-exec init"); | |
1781 | return 'U'; | |
1782 | default: | |
1783 | initlog(L_VB, "Switching to runlevel: %c", foo); | |
1784 | } | |
1785 | ||
5f959b29 DWF |
1786 | if (foo == 'Q') { |
1787 | #if defined(SIGINT_ONLYONCE) && (SIGINT_ONLYONCE == 1) | |
1788 | /* Re-enable signal from keyboard */ | |
1789 | struct sigaction sa; | |
1790 | SETSIG(sa, SIGINT, signal_handler, 0); | |
1791 | #endif | |
1792 | return runlevel; | |
1793 | } | |
a74aeac6 PR |
1794 | |
1795 | /* Check if this is a runlevel a, b or c */ | |
1796 | if (strchr("ABC", foo)) { | |
1797 | if (runlevel == 'S') return(runlevel); | |
1798 | ||
1799 | /* Read inittab again first! */ | |
1800 | read_inittab(); | |
1801 | ||
1802 | /* Mark those special tasks */ | |
1803 | for(ch = family; ch; ch = ch->next) | |
1804 | if (strchr(ch->rlevel, foo) != NULL || | |
1805 | strchr(ch->rlevel, tolower(foo)) != NULL) { | |
1806 | ch->flags |= DEMAND; | |
1807 | ch->flags &= ~XECUTED; | |
1808 | INITDBG(L_VB, | |
1809 | "Marking (%s) as ondemand, flags %d", | |
1810 | ch->id, ch->flags); | |
1811 | } | |
1812 | return runlevel; | |
1813 | } | |
1814 | ||
1815 | /* Store both the old and the new runlevel. */ | |
63a2c981 DWF |
1816 | wrote_utmp_rlevel = 0; |
1817 | wrote_wtmp_rlevel = 0; | |
a74aeac6 PR |
1818 | write_utmp_wtmp("runlevel", "~~", foo + 256*runlevel, RUN_LVL, "~"); |
1819 | thislevel = foo; | |
1820 | prevlevel = runlevel; | |
1821 | return foo; | |
1822 | } | |
1823 | ||
1824 | ||
1825 | /* | |
1826 | * This procedure is called after every signal (SIGHUP, SIGALRM..) | |
1827 | * | |
1828 | * Only clear the 'failing' flag if the process is sleeping | |
1829 | * longer than 5 minutes, or inittab was read again due | |
1830 | * to user interaction. | |
1831 | */ | |
5f959b29 | 1832 | static |
a74aeac6 PR |
1833 | void fail_check(void) |
1834 | { | |
1835 | CHILD *ch; /* Pointer to child structure */ | |
1836 | time_t t; /* System time */ | |
1837 | time_t next_alarm = 0; /* When to set next alarm */ | |
1838 | ||
1839 | time(&t); | |
1840 | ||
1841 | for(ch = family; ch; ch = ch->next) { | |
1842 | ||
1843 | if (ch->flags & FAILING) { | |
1844 | /* Can we free this sucker? */ | |
1845 | if (ch->tm + SLEEPTIME < t) { | |
1846 | ch->flags &= ~FAILING; | |
1847 | ch->count = 0; | |
1848 | ch->tm = 0; | |
1849 | } else { | |
1850 | /* No, we'll look again later */ | |
1851 | if (next_alarm == 0 || | |
1852 | ch->tm + SLEEPTIME > next_alarm) | |
1853 | next_alarm = ch->tm + SLEEPTIME; | |
1854 | } | |
1855 | } | |
1856 | } | |
1857 | if (next_alarm) { | |
1858 | next_alarm -= t; | |
1859 | if (next_alarm < 1) next_alarm = 1; | |
1860 | alarm(next_alarm); | |
1861 | } | |
1862 | } | |
1863 | ||
1864 | /* Set all 'Fail' timers to 0 */ | |
5f959b29 | 1865 | static |
a74aeac6 PR |
1866 | void fail_cancel(void) |
1867 | { | |
1868 | CHILD *ch; | |
1869 | ||
1870 | for(ch = family; ch; ch = ch->next) { | |
1871 | ch->count = 0; | |
1872 | ch->tm = 0; | |
1873 | ch->flags &= ~FAILING; | |
1874 | } | |
1875 | } | |
1876 | ||
1877 | /* | |
1878 | * Start up powerfail entries. | |
1879 | */ | |
5f959b29 | 1880 | static |
a74aeac6 PR |
1881 | void do_power_fail(int pwrstat) |
1882 | { | |
1883 | CHILD *ch; | |
1884 | ||
1885 | /* | |
1886 | * Tell powerwait & powerfail entries to start up | |
1887 | */ | |
1888 | for (ch = family; ch; ch = ch->next) { | |
1889 | if (pwrstat == 'O') { | |
1890 | /* | |
1891 | * The power is OK again. | |
1892 | */ | |
1893 | if (ch->action == POWEROKWAIT) | |
1894 | ch->flags &= ~XECUTED; | |
1895 | } else if (pwrstat == 'L') { | |
1896 | /* | |
1897 | * Low battery, shut down now. | |
1898 | */ | |
1899 | if (ch->action == POWERFAILNOW) | |
1900 | ch->flags &= ~XECUTED; | |
1901 | } else { | |
1902 | /* | |
1903 | * Power is failing, shutdown imminent | |
1904 | */ | |
1905 | if (ch->action == POWERFAIL || ch->action == POWERWAIT) | |
1906 | ch->flags &= ~XECUTED; | |
1907 | } | |
1908 | } | |
1909 | } | |
1910 | ||
1911 | /* | |
1912 | * Check for state-pipe presence | |
1913 | */ | |
5f959b29 | 1914 | static |
a74aeac6 PR |
1915 | int check_pipe(int fd) |
1916 | { | |
1917 | struct timeval t; | |
1918 | fd_set s; | |
1919 | char signature[8]; | |
1920 | ||
1921 | FD_ZERO(&s); | |
1922 | FD_SET(fd, &s); | |
1923 | t.tv_sec = t.tv_usec = 0; | |
1924 | ||
1925 | if (select(fd+1, &s, NULL, NULL, &t) != 1) | |
1926 | return 0; | |
1927 | if (read(fd, signature, 8) != 8) | |
1928 | return 0; | |
1929 | return strncmp(Signature, signature, 8) == 0; | |
1930 | } | |
1931 | ||
1932 | /* | |
1933 | * Make a state-pipe. | |
1934 | */ | |
5f959b29 | 1935 | static |
a74aeac6 PR |
1936 | int make_pipe(int fd) |
1937 | { | |
1938 | int fds[2]; | |
1939 | ||
1940 | pipe(fds); | |
1941 | dup2(fds[0], fd); | |
1942 | close(fds[0]); | |
1943 | fcntl(fds[1], F_SETFD, 1); | |
1944 | fcntl(fd, F_SETFD, 0); | |
1945 | write(fds[1], Signature, 8); | |
1946 | ||
1947 | return fds[1]; | |
1948 | } | |
1949 | ||
1950 | /* | |
1951 | * Attempt to re-exec. | |
1952 | */ | |
5f959b29 | 1953 | static |
a74aeac6 PR |
1954 | void re_exec(void) |
1955 | { | |
1956 | CHILD *ch; | |
1957 | sigset_t mask, oldset; | |
1958 | pid_t pid; | |
1959 | char **env; | |
1960 | int fd; | |
1961 | ||
1962 | if (strchr("S0123456",runlevel) == NULL) | |
1963 | return; | |
1964 | ||
1965 | /* | |
1966 | * Reset the alarm, and block all signals. | |
1967 | */ | |
1968 | alarm(0); | |
1969 | sigfillset(&mask); | |
1970 | sigprocmask(SIG_BLOCK, &mask, &oldset); | |
1971 | ||
1972 | /* | |
1973 | * construct a pipe fd --> STATE_PIPE and write a signature | |
1974 | */ | |
1975 | fd = make_pipe(STATE_PIPE); | |
1976 | ||
1977 | /* | |
1978 | * It's a backup day today, so I'm pissed off. Being a BOFH, however, | |
1979 | * does have it's advantages... | |
1980 | */ | |
1981 | fail_cancel(); | |
1982 | close(pipe_fd); | |
1983 | pipe_fd = -1; | |
1984 | DELSET(got_signals, SIGCHLD); | |
1985 | DELSET(got_signals, SIGHUP); | |
1986 | DELSET(got_signals, SIGUSR1); | |
1987 | ||
1988 | /* | |
1989 | * That should be cleaned. | |
1990 | */ | |
1991 | for(ch = family; ch; ch = ch->next) | |
1992 | if (ch->flags & ZOMBIE) { | |
1993 | INITDBG(L_VB, "Child died, PID= %d", ch->pid); | |
1994 | ch->flags &= ~(RUNNING|ZOMBIE|WAITING); | |
1995 | if (ch->process[0] != '+') | |
1996 | write_utmp_wtmp("", ch->id, ch->pid, DEAD_PROCESS, NULL); | |
1997 | } | |
1998 | ||
1999 | if ((pid = fork()) == 0) { | |
2000 | /* | |
2001 | * Child sends state information to the parent. | |
2002 | */ | |
2003 | send_state(fd); | |
2004 | exit(0); | |
2005 | } | |
2006 | ||
2007 | /* | |
2008 | * The existing init process execs a new init binary. | |
2009 | */ | |
2010 | env = init_buildenv(0); | |
2011 | execle(myname, myname, "--init", NULL, env); | |
2012 | ||
2013 | /* | |
2014 | * We shouldn't be here, something failed. | |
2015 | * Bitch, close the state pipe, unblock signals and return. | |
2016 | */ | |
2017 | close(fd); | |
2018 | close(STATE_PIPE); | |
2019 | sigprocmask(SIG_SETMASK, &oldset, NULL); | |
2020 | init_freeenv(env); | |
2021 | initlog(L_CO, "Attempt to re-exec failed"); | |
2022 | } | |
2023 | ||
63a2c981 DWF |
2024 | /* |
2025 | * Redo utmp/wtmp entries if required or requested | |
2026 | * Check for written records and size of utmp | |
2027 | */ | |
2028 | static | |
2029 | void redo_utmp_wtmp(void) | |
2030 | { | |
2031 | struct stat ustat; | |
2032 | const int ret = stat(UTMP_FILE, &ustat); | |
2033 | ||
2034 | if ((ret < 0) || (ustat.st_size == 0)) | |
2035 | wrote_utmp_rlevel = wrote_utmp_reboot = 0; | |
2036 | ||
2037 | if ((wrote_wtmp_reboot == 0) || (wrote_utmp_reboot == 0)) | |
2038 | write_utmp_wtmp("reboot", "~~", 0, BOOT_TIME, "~"); | |
2039 | ||
2040 | if ((wrote_wtmp_rlevel == 0) || (wrote_wtmp_rlevel == 0)) | |
2041 | write_utmp_wtmp("runlevel", "~~", thislevel + 256 * prevlevel, RUN_LVL, "~"); | |
2042 | } | |
a74aeac6 PR |
2043 | |
2044 | /* | |
2045 | * We got a change runlevel request through the | |
2046 | * init.fifo. Process it. | |
2047 | */ | |
5f959b29 | 2048 | static |
a74aeac6 PR |
2049 | void fifo_new_level(int level) |
2050 | { | |
2051 | #if CHANGE_WAIT | |
2052 | CHILD *ch; | |
2053 | #endif | |
2054 | int oldlevel; | |
2055 | ||
2056 | if (level == runlevel) return; | |
2057 | ||
2058 | #if CHANGE_WAIT | |
2059 | /* Are we waiting for a child? */ | |
2060 | for(ch = family; ch; ch = ch->next) | |
2061 | if (ch->flags & WAITING) break; | |
2062 | if (ch == NULL) | |
2063 | #endif | |
2064 | { | |
2065 | /* We need to go into a new runlevel */ | |
2066 | oldlevel = runlevel; | |
2067 | runlevel = read_level(level); | |
2068 | if (runlevel == 'U') { | |
2069 | runlevel = oldlevel; | |
2070 | re_exec(); | |
2071 | } else { | |
2072 | if (oldlevel != 'S' && runlevel == 'S') console_stty(); | |
2073 | if (runlevel == '6' || runlevel == '0' || | |
2074 | runlevel == '1') console_stty(); | |
63a2c981 | 2075 | if (runlevel > '1' && runlevel < '6') redo_utmp_wtmp(); |
a74aeac6 PR |
2076 | read_inittab(); |
2077 | fail_cancel(); | |
5f959b29 | 2078 | setproctitle("init [%c]", (int)runlevel); |
a74aeac6 PR |
2079 | } |
2080 | } | |
2081 | } | |
2082 | ||
2083 | ||
2084 | /* | |
2085 | * Set/unset environment variables. The variables are | |
2086 | * encoded as KEY=VAL\0KEY=VAL\0\0. With "=VAL" it means | |
2087 | * setenv, without it means unsetenv. | |
2088 | */ | |
5f959b29 | 2089 | static |
a74aeac6 PR |
2090 | void initcmd_setenv(char *data, int size) |
2091 | { | |
2092 | char *env, *p, *e, *eq; | |
2093 | int i, sz; | |
2094 | ||
2095 | e = data + size; | |
2096 | ||
2097 | while (*data && data < e) { | |
2098 | eq = NULL; | |
2099 | for (p = data; *p && p < e; p++) | |
2100 | if (*p == '=') eq = p; | |
2101 | if (*p) break; | |
2102 | env = data; | |
2103 | data = ++p; | |
2104 | ||
2105 | sz = eq ? (eq - env) : (p - env); | |
2106 | ||
2107 | /*initlog(L_SY, "init_setenv: %s, %s, %d", env, eq, sz);*/ | |
2108 | ||
2109 | /* | |
2110 | * We only allow INIT_* to be set. | |
2111 | */ | |
2112 | if (strncmp(env, "INIT_", 5) != 0) | |
2113 | continue; | |
2114 | ||
2115 | /* Free existing vars. */ | |
2116 | for (i = 0; i < NR_EXTRA_ENV; i++) { | |
2117 | if (extra_env[i] == NULL) continue; | |
2118 | if (!strncmp(extra_env[i], env, sz) && | |
2119 | extra_env[i][sz] == '=') { | |
2120 | free(extra_env[i]); | |
2121 | extra_env[i] = NULL; | |
2122 | } | |
2123 | } | |
2124 | ||
2125 | /* Set new vars if needed. */ | |
2126 | if (eq == NULL) continue; | |
2127 | for (i = 0; i < NR_EXTRA_ENV; i++) { | |
2128 | if (extra_env[i] == NULL) { | |
2129 | extra_env[i] = istrdup(env); | |
2130 | break; | |
2131 | } | |
2132 | } | |
2133 | } | |
2134 | } | |
2135 | ||
2136 | ||
2137 | /* | |
2138 | * Read from the init FIFO. Processes like telnetd and rlogind can | |
2139 | * ask us to create login processes on their behalf. | |
2140 | * | |
2141 | * FIXME: this needs to be finished. NOT that it is buggy, but we need | |
2142 | * to add the telnetd/rlogind stuff so people can start using it. | |
2143 | * Maybe move to using an AF_UNIX socket so we can use | |
2144 | * the 2.2 kernel credential stuff to see who we're talking to. | |
2145 | * | |
2146 | */ | |
5f959b29 | 2147 | static |
a74aeac6 PR |
2148 | void check_init_fifo(void) |
2149 | { | |
2150 | struct init_request request; | |
2151 | struct timeval tv; | |
2152 | struct stat st, st2; | |
2153 | fd_set fds; | |
2154 | int n; | |
2155 | int quit = 0; | |
2156 | ||
2157 | /* | |
2158 | * First, try to create /dev/initctl if not present. | |
2159 | */ | |
2160 | if (stat(INIT_FIFO, &st2) < 0 && errno == ENOENT) | |
2161 | (void)mkfifo(INIT_FIFO, 0600); | |
2162 | ||
2163 | /* | |
2164 | * If /dev/initctl is open, stat the file to see if it | |
2165 | * is still the _same_ inode. | |
2166 | */ | |
2167 | if (pipe_fd >= 0) { | |
2168 | fstat(pipe_fd, &st); | |
2169 | if (stat(INIT_FIFO, &st2) < 0 || | |
2170 | st.st_dev != st2.st_dev || | |
2171 | st.st_ino != st2.st_ino) { | |
2172 | close(pipe_fd); | |
2173 | pipe_fd = -1; | |
2174 | } | |
2175 | } | |
2176 | ||
2177 | /* | |
2178 | * Now finally try to open /dev/initctl | |
2179 | */ | |
2180 | if (pipe_fd < 0) { | |
2181 | if ((pipe_fd = open(INIT_FIFO, O_RDWR|O_NONBLOCK)) >= 0) { | |
2182 | fstat(pipe_fd, &st); | |
2183 | if (!S_ISFIFO(st.st_mode)) { | |
2184 | initlog(L_VB, "%s is not a fifo", INIT_FIFO); | |
2185 | close(pipe_fd); | |
2186 | pipe_fd = -1; | |
2187 | } | |
2188 | } | |
2189 | if (pipe_fd >= 0) { | |
2190 | /* | |
2191 | * Don't use fd's 0, 1 or 2. | |
2192 | */ | |
2193 | (void) dup2(pipe_fd, PIPE_FD); | |
2194 | close(pipe_fd); | |
2195 | pipe_fd = PIPE_FD; | |
2196 | ||
2197 | /* | |
2198 | * Return to caller - we'll be back later. | |
2199 | */ | |
2200 | } | |
2201 | } | |
2202 | ||
2203 | /* Wait for data to appear, _if_ the pipe was opened. */ | |
2204 | if (pipe_fd >= 0) while(!quit) { | |
2205 | ||
2206 | /* Do select, return on EINTR. */ | |
2207 | FD_ZERO(&fds); | |
2208 | FD_SET(pipe_fd, &fds); | |
2209 | tv.tv_sec = 5; | |
2210 | tv.tv_usec = 0; | |
2211 | n = select(pipe_fd + 1, &fds, NULL, NULL, &tv); | |
2212 | if (n <= 0) { | |
2213 | if (n == 0 || errno == EINTR) return; | |
2214 | continue; | |
2215 | } | |
2216 | ||
2217 | /* Read the data, return on EINTR. */ | |
2218 | n = read(pipe_fd, &request, sizeof(request)); | |
2219 | if (n == 0) { | |
2220 | /* | |
2221 | * End of file. This can't happen under Linux (because | |
2222 | * the pipe is opened O_RDWR - see select() in the | |
2223 | * kernel) but you never know... | |
2224 | */ | |
2225 | close(pipe_fd); | |
2226 | pipe_fd = -1; | |
2227 | return; | |
2228 | } | |
2229 | if (n <= 0) { | |
2230 | if (errno == EINTR) return; | |
2231 | initlog(L_VB, "error reading initrequest"); | |
2232 | continue; | |
2233 | } | |
2234 | ||
2235 | /* | |
2236 | * This is a convenient point to also try to | |
2237 | * find the console device or check if it changed. | |
2238 | */ | |
2239 | console_init(); | |
2240 | ||
2241 | /* | |
2242 | * Process request. | |
2243 | */ | |
2244 | if (request.magic != INIT_MAGIC || n != sizeof(request)) { | |
2245 | initlog(L_VB, "got bogus initrequest"); | |
2246 | continue; | |
2247 | } | |
2248 | switch(request.cmd) { | |
2249 | case INIT_CMD_RUNLVL: | |
2250 | sltime = request.sleeptime; | |
2251 | fifo_new_level(request.runlevel); | |
2252 | quit = 1; | |
2253 | break; | |
2254 | case INIT_CMD_POWERFAIL: | |
2255 | sltime = request.sleeptime; | |
2256 | do_power_fail('F'); | |
2257 | quit = 1; | |
2258 | break; | |
2259 | case INIT_CMD_POWERFAILNOW: | |
2260 | sltime = request.sleeptime; | |
2261 | do_power_fail('L'); | |
2262 | quit = 1; | |
2263 | break; | |
2264 | case INIT_CMD_POWEROK: | |
2265 | sltime = request.sleeptime; | |
2266 | do_power_fail('O'); | |
2267 | quit = 1; | |
2268 | break; | |
2269 | case INIT_CMD_SETENV: | |
2270 | initcmd_setenv(request.i.data, sizeof(request.i.data)); | |
2271 | break; | |
a74aeac6 PR |
2272 | default: |
2273 | initlog(L_VB, "got unimplemented initrequest."); | |
2274 | break; | |
2275 | } | |
2276 | } | |
2277 | ||
2278 | /* | |
2279 | * We come here if the pipe couldn't be opened. | |
2280 | */ | |
2281 | if (pipe_fd < 0) pause(); | |
2282 | ||
2283 | } | |
2284 | ||
2285 | ||
2286 | /* | |
2287 | * This function is used in the transition | |
2288 | * sysinit (-> single user) boot -> multi-user. | |
2289 | */ | |
5f959b29 | 2290 | static |
a74aeac6 PR |
2291 | void boot_transitions() |
2292 | { | |
2293 | CHILD *ch; | |
2294 | static int newlevel = 0; | |
2295 | static int warn = 1; | |
2296 | int loglevel; | |
2297 | int oldlevel; | |
2298 | ||
2299 | /* Check if there is something to wait for! */ | |
2300 | for( ch = family; ch; ch = ch->next ) | |
2301 | if ((ch->flags & RUNNING) && ch->action != BOOT) break; | |
2302 | ||
2303 | if (ch == NULL) { | |
2304 | /* No processes left in this level, proceed to next level. */ | |
2305 | loglevel = -1; | |
2306 | oldlevel = 'N'; | |
2307 | switch(runlevel) { | |
2308 | case '#': /* SYSINIT -> BOOT */ | |
2309 | INITDBG(L_VB, "SYSINIT -> BOOT"); | |
2310 | ||
2311 | /* Write a boot record. */ | |
2312 | wrote_utmp_reboot = 0; | |
2313 | wrote_wtmp_reboot = 0; | |
2314 | write_utmp_wtmp("reboot", "~~", 0, BOOT_TIME, "~"); | |
2315 | ||
2316 | /* Get our run level */ | |
2317 | newlevel = dfl_level ? dfl_level : get_init_default(); | |
2318 | if (newlevel == 'S') { | |
2319 | runlevel = newlevel; | |
2320 | /* Not really 'S' but show anyway. */ | |
2321 | setproctitle("init [S]"); | |
2322 | } else | |
2323 | runlevel = '*'; | |
2324 | break; | |
2325 | case '*': /* BOOT -> NORMAL */ | |
2326 | INITDBG(L_VB, "BOOT -> NORMAL"); | |
2327 | if (runlevel != newlevel) | |
2328 | loglevel = newlevel; | |
2329 | runlevel = newlevel; | |
2330 | did_boot = 1; | |
2331 | warn = 1; | |
2332 | break; | |
2333 | case 'S': /* Ended SU mode */ | |
2334 | case 's': | |
2335 | INITDBG(L_VB, "END SU MODE"); | |
2336 | newlevel = get_init_default(); | |
2337 | if (!did_boot && newlevel != 'S') | |
2338 | runlevel = '*'; | |
2339 | else { | |
2340 | if (runlevel != newlevel) | |
2341 | loglevel = newlevel; | |
2342 | runlevel = newlevel; | |
2343 | oldlevel = 'S'; | |
2344 | } | |
2345 | warn = 1; | |
2346 | for(ch = family; ch; ch = ch->next) | |
2347 | if (strcmp(ch->rlevel, "S") == 0) | |
2348 | ch->flags &= ~(FAILING|WAITING|XECUTED); | |
2349 | break; | |
2350 | default: | |
2351 | if (warn) | |
2352 | initlog(L_VB, | |
2353 | "no more processes left in this runlevel"); | |
2354 | warn = 0; | |
2355 | loglevel = -1; | |
2356 | if (got_signals == 0) | |
2357 | check_init_fifo(); | |
2358 | break; | |
2359 | } | |
2360 | if (loglevel > 0) { | |
2361 | initlog(L_VB, "Entering runlevel: %c", runlevel); | |
63a2c981 DWF |
2362 | wrote_utmp_rlevel = 0; |
2363 | wrote_wtmp_rlevel = 0; | |
a74aeac6 PR |
2364 | write_utmp_wtmp("runlevel", "~~", runlevel + 256 * oldlevel, RUN_LVL, "~"); |
2365 | thislevel = runlevel; | |
2366 | prevlevel = oldlevel; | |
5f959b29 | 2367 | setproctitle("init [%c]", (int)runlevel); |
a74aeac6 PR |
2368 | } |
2369 | } | |
2370 | } | |
2371 | ||
2372 | /* | |
2373 | * Init got hit by a signal. See which signal it is, | |
2374 | * and act accordingly. | |
2375 | */ | |
5f959b29 | 2376 | static |
a74aeac6 PR |
2377 | void process_signals() |
2378 | { | |
2379 | CHILD *ch; | |
2380 | int pwrstat; | |
2381 | int oldlevel; | |
2382 | int fd; | |
2383 | char c; | |
2384 | ||
2385 | if (ISMEMBER(got_signals, SIGPWR)) { | |
2386 | INITDBG(L_VB, "got SIGPWR"); | |
2387 | /* See _what_ kind of SIGPWR this is. */ | |
2388 | pwrstat = 0; | |
2389 | if ((fd = open(PWRSTAT, O_RDONLY)) >= 0) { | |
2390 | c = 0; | |
2391 | read(fd, &c, 1); | |
2392 | pwrstat = c; | |
2393 | close(fd); | |
2394 | unlink(PWRSTAT); | |
2395 | } | |
2396 | do_power_fail(pwrstat); | |
2397 | DELSET(got_signals, SIGPWR); | |
2398 | } | |
2399 | ||
2400 | if (ISMEMBER(got_signals, SIGINT)) { | |
5f959b29 DWF |
2401 | #if defined(SIGINT_ONLYONCE) && (SIGINT_ONLYONCE == 1) |
2402 | /* Ignore any further signal from keyboard */ | |
2403 | struct sigaction sa; | |
2404 | SETSIG(sa, SIGINT, SIG_IGN, SA_RESTART); | |
2405 | #endif | |
a74aeac6 PR |
2406 | INITDBG(L_VB, "got SIGINT"); |
2407 | /* Tell ctrlaltdel entry to start up */ | |
2408 | for(ch = family; ch; ch = ch->next) | |
2409 | if (ch->action == CTRLALTDEL) | |
2410 | ch->flags &= ~XECUTED; | |
2411 | DELSET(got_signals, SIGINT); | |
2412 | } | |
2413 | ||
2414 | if (ISMEMBER(got_signals, SIGWINCH)) { | |
2415 | INITDBG(L_VB, "got SIGWINCH"); | |
2416 | /* Tell kbrequest entry to start up */ | |
2417 | for(ch = family; ch; ch = ch->next) | |
2418 | if (ch->action == KBREQUEST) | |
2419 | ch->flags &= ~XECUTED; | |
2420 | DELSET(got_signals, SIGWINCH); | |
2421 | } | |
2422 | ||
2423 | if (ISMEMBER(got_signals, SIGALRM)) { | |
2424 | INITDBG(L_VB, "got SIGALRM"); | |
2425 | /* The timer went off: check it out */ | |
2426 | DELSET(got_signals, SIGALRM); | |
2427 | } | |
2428 | ||
2429 | if (ISMEMBER(got_signals, SIGCHLD)) { | |
2430 | INITDBG(L_VB, "got SIGCHLD"); | |
2431 | /* First set flag to 0 */ | |
2432 | DELSET(got_signals, SIGCHLD); | |
2433 | ||
2434 | /* See which child this was */ | |
2435 | for(ch = family; ch; ch = ch->next) | |
2436 | if (ch->flags & ZOMBIE) { | |
2437 | INITDBG(L_VB, "Child died, PID= %d", ch->pid); | |
2438 | ch->flags &= ~(RUNNING|ZOMBIE|WAITING); | |
2439 | if (ch->process[0] != '+') | |
2440 | write_utmp_wtmp("", ch->id, ch->pid, DEAD_PROCESS, NULL); | |
2441 | } | |
2442 | ||
2443 | } | |
2444 | ||
2445 | if (ISMEMBER(got_signals, SIGHUP)) { | |
2446 | INITDBG(L_VB, "got SIGHUP"); | |
2447 | #if CHANGE_WAIT | |
2448 | /* Are we waiting for a child? */ | |
2449 | for(ch = family; ch; ch = ch->next) | |
2450 | if (ch->flags & WAITING) break; | |
2451 | if (ch == NULL) | |
2452 | #endif | |
2453 | { | |
2454 | /* We need to go into a new runlevel */ | |
2455 | oldlevel = runlevel; | |
2456 | #ifdef INITLVL | |
2457 | runlevel = read_level(0); | |
2458 | #endif | |
2459 | if (runlevel == 'U') { | |
2460 | runlevel = oldlevel; | |
2461 | re_exec(); | |
2462 | } else { | |
2463 | if (oldlevel != 'S' && runlevel == 'S') console_stty(); | |
2464 | if (runlevel == '6' || runlevel == '0' || | |
2465 | runlevel == '1') console_stty(); | |
2466 | read_inittab(); | |
2467 | fail_cancel(); | |
5f959b29 | 2468 | setproctitle("init [%c]", (int)runlevel); |
a74aeac6 PR |
2469 | DELSET(got_signals, SIGHUP); |
2470 | } | |
2471 | } | |
2472 | } | |
2473 | if (ISMEMBER(got_signals, SIGUSR1)) { | |
2474 | /* | |
2475 | * SIGUSR1 means close and reopen /dev/initctl | |
2476 | */ | |
2477 | INITDBG(L_VB, "got SIGUSR1"); | |
2478 | close(pipe_fd); | |
2479 | pipe_fd = -1; | |
2480 | DELSET(got_signals, SIGUSR1); | |
2481 | } | |
2482 | } | |
2483 | ||
2484 | /* | |
2485 | * The main loop | |
2486 | */ | |
5f959b29 DWF |
2487 | static |
2488 | void init_main(void) | |
a74aeac6 PR |
2489 | { |
2490 | CHILD *ch; | |
2491 | struct sigaction sa; | |
2492 | sigset_t sgt; | |
2493 | pid_t rc; | |
2494 | int f, st; | |
2495 | ||
2496 | if (!reload) { | |
2497 | ||
2498 | #if INITDEBUG | |
2499 | /* | |
2500 | * Fork so we can debug the init process. | |
2501 | */ | |
2502 | if ((f = fork()) > 0) { | |
2503 | static const char killmsg[] = "PRNT: init killed.\r\n"; | |
2504 | pid_t rc; | |
2505 | ||
2506 | while((rc = wait(&st)) != f) | |
2507 | if (rc < 0 && errno == ECHILD) | |
2508 | break; | |
2509 | write(1, killmsg, sizeof(killmsg) - 1); | |
2510 | while(1) pause(); | |
2511 | } | |
2512 | #endif | |
2513 | ||
2514 | #ifdef __linux__ | |
2515 | /* | |
2516 | * Tell the kernel to send us SIGINT when CTRL-ALT-DEL | |
2517 | * is pressed, and that we want to handle keyboard signals. | |
2518 | */ | |
2519 | init_reboot(BMAGIC_SOFT); | |
2520 | if ((f = open(VT_MASTER, O_RDWR | O_NOCTTY)) >= 0) { | |
2521 | (void) ioctl(f, KDSIGACCEPT, SIGWINCH); | |
2522 | close(f); | |
2523 | } else | |
2524 | (void) ioctl(0, KDSIGACCEPT, SIGWINCH); | |
2525 | #endif | |
2526 | ||
2527 | /* | |
2528 | * Ignore all signals. | |
2529 | */ | |
2530 | for(f = 1; f <= NSIG; f++) | |
2531 | SETSIG(sa, f, SIG_IGN, SA_RESTART); | |
2532 | } | |
2533 | ||
2534 | SETSIG(sa, SIGALRM, signal_handler, 0); | |
2535 | SETSIG(sa, SIGHUP, signal_handler, 0); | |
2536 | SETSIG(sa, SIGINT, signal_handler, 0); | |
2537 | SETSIG(sa, SIGCHLD, chld_handler, SA_RESTART); | |
2538 | SETSIG(sa, SIGPWR, signal_handler, 0); | |
2539 | SETSIG(sa, SIGWINCH, signal_handler, 0); | |
2540 | SETSIG(sa, SIGUSR1, signal_handler, 0); | |
2541 | SETSIG(sa, SIGSTOP, stop_handler, SA_RESTART); | |
2542 | SETSIG(sa, SIGTSTP, stop_handler, SA_RESTART); | |
2543 | SETSIG(sa, SIGCONT, cont_handler, SA_RESTART); | |
2544 | SETSIG(sa, SIGSEGV, (void (*)(int))segv_handler, SA_RESTART); | |
2545 | ||
2546 | console_init(); | |
2547 | ||
2548 | if (!reload) { | |
63a2c981 | 2549 | int fd; |
a74aeac6 PR |
2550 | |
2551 | /* Close whatever files are open, and reset the console. */ | |
2552 | close(0); | |
2553 | close(1); | |
2554 | close(2); | |
2555 | console_stty(); | |
2556 | setsid(); | |
2557 | ||
2558 | /* | |
2559 | * Set default PATH variable. | |
2560 | */ | |
2561 | setenv("PATH", PATH_DEFAULT, 1 /* Overwrite */); | |
2562 | ||
2563 | /* | |
2564 | * Initialize /var/run/utmp (only works if /var is on | |
2565 | * root and mounted rw) | |
2566 | */ | |
63a2c981 DWF |
2567 | if ((fd = open(UTMP_FILE, O_WRONLY|O_CREAT|O_TRUNC, 0644)) >= 0) |
2568 | close(fd); | |
a74aeac6 PR |
2569 | |
2570 | /* | |
2571 | * Say hello to the world | |
2572 | */ | |
2573 | initlog(L_CO, bootmsg, "booting"); | |
2574 | ||
2575 | /* | |
2576 | * See if we have to start an emergency shell. | |
2577 | */ | |
2578 | if (emerg_shell) { | |
2579 | SETSIG(sa, SIGCHLD, SIG_DFL, SA_RESTART); | |
2580 | if (spawn(&ch_emerg, &f) > 0) { | |
2581 | while((rc = wait(&st)) != f) | |
2582 | if (rc < 0 && errno == ECHILD) | |
2583 | break; | |
2584 | } | |
2585 | SETSIG(sa, SIGCHLD, chld_handler, SA_RESTART); | |
2586 | } | |
2587 | ||
2588 | /* | |
2589 | * Start normal boot procedure. | |
2590 | */ | |
2591 | runlevel = '#'; | |
2592 | read_inittab(); | |
2593 | ||
2594 | } else { | |
2595 | /* | |
2596 | * Restart: unblock signals and let the show go on | |
2597 | */ | |
2598 | initlog(L_CO, bootmsg, "reloading"); | |
2599 | sigfillset(&sgt); | |
2600 | sigprocmask(SIG_UNBLOCK, &sgt, NULL); | |
2601 | ||
2602 | /* | |
2603 | * Set default PATH variable. | |
2604 | */ | |
2605 | setenv("PATH", PATH_DEFAULT, 0 /* Don't overwrite */); | |
2606 | } | |
2607 | start_if_needed(); | |
2608 | ||
2609 | while(1) { | |
2610 | ||
2611 | /* See if we need to make the boot transitions. */ | |
2612 | boot_transitions(); | |
2613 | INITDBG(L_VB, "init_main: waiting.."); | |
2614 | ||
2615 | /* Check if there are processes to be waited on. */ | |
2616 | for(ch = family; ch; ch = ch->next) | |
2617 | if ((ch->flags & RUNNING) && ch->action != BOOT) break; | |
2618 | ||
2619 | #if CHANGE_WAIT | |
2620 | /* Wait until we get hit by some signal. */ | |
2621 | while (ch != NULL && got_signals == 0) { | |
2622 | if (ISMEMBER(got_signals, SIGHUP)) { | |
2623 | /* See if there are processes to be waited on. */ | |
2624 | for(ch = family; ch; ch = ch->next) | |
2625 | if (ch->flags & WAITING) break; | |
2626 | } | |
2627 | if (ch != NULL) check_init_fifo(); | |
2628 | } | |
2629 | #else /* CHANGE_WAIT */ | |
2630 | if (ch != NULL && got_signals == 0) check_init_fifo(); | |
2631 | #endif /* CHANGE_WAIT */ | |
2632 | ||
2633 | /* Check the 'failing' flags */ | |
2634 | fail_check(); | |
2635 | ||
2636 | /* Process any signals. */ | |
2637 | process_signals(); | |
2638 | ||
2639 | /* See what we need to start up (again) */ | |
2640 | start_if_needed(); | |
2641 | } | |
2642 | /*NOTREACHED*/ | |
2643 | } | |
2644 | ||
2645 | /* | |
2646 | * Tell the user about the syntax we expect. | |
2647 | */ | |
5f959b29 | 2648 | static |
a74aeac6 PR |
2649 | void usage(char *s) |
2650 | { | |
2651 | 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); | |
2652 | exit(1); | |
2653 | } | |
2654 | ||
5f959b29 | 2655 | static |
a74aeac6 PR |
2656 | int telinit(char *progname, int argc, char **argv) |
2657 | { | |
2658 | #ifdef TELINIT_USES_INITLVL | |
2659 | FILE *fp; | |
2660 | #endif | |
2661 | struct init_request request; | |
2662 | struct sigaction sa; | |
2663 | int f, fd, l; | |
2664 | char *env = NULL; | |
2665 | ||
2666 | memset(&request, 0, sizeof(request)); | |
2667 | request.magic = INIT_MAGIC; | |
2668 | ||
2669 | while ((f = getopt(argc, argv, "t:e:")) != EOF) switch(f) { | |
2670 | case 't': | |
2671 | sltime = atoi(optarg); | |
2672 | break; | |
2673 | case 'e': | |
2674 | if (env == NULL) | |
2675 | env = request.i.data; | |
2676 | l = strlen(optarg); | |
2677 | if (env + l + 2 > request.i.data + sizeof(request.i.data)) { | |
2678 | fprintf(stderr, "%s: -e option data " | |
2679 | "too large\n", progname); | |
2680 | exit(1); | |
2681 | } | |
2682 | memcpy(env, optarg, l); | |
2683 | env += l; | |
2684 | *env++ = 0; | |
2685 | break; | |
2686 | default: | |
2687 | usage(progname); | |
2688 | break; | |
2689 | } | |
2690 | ||
2691 | if (env) *env++ = 0; | |
2692 | ||
2693 | if (env) { | |
2694 | if (argc != optind) | |
2695 | usage(progname); | |
2696 | request.cmd = INIT_CMD_SETENV; | |
2697 | } else { | |
2698 | if (argc - optind != 1 || strlen(argv[optind]) != 1) | |
2699 | usage(progname); | |
2700 | if (!strchr("0123456789SsQqAaBbCcUu", argv[optind][0])) | |
2701 | usage(progname); | |
2702 | request.cmd = INIT_CMD_RUNLVL; | |
2703 | request.runlevel = env ? 0 : argv[optind][0]; | |
2704 | request.sleeptime = sltime; | |
2705 | } | |
2706 | ||
5f959b29 DWF |
2707 | /* Change to the root directory. */ |
2708 | chdir("/"); | |
2709 | ||
a74aeac6 PR |
2710 | /* Open the fifo and write a command. */ |
2711 | /* Make sure we don't hang on opening /dev/initctl */ | |
2712 | SETSIG(sa, SIGALRM, signal_handler, 0); | |
2713 | alarm(3); | |
5f959b29 DWF |
2714 | if ((fd = open(INIT_FIFO, O_WRONLY)) >= 0) { |
2715 | ssize_t p = 0; | |
2716 | size_t s = sizeof(request); | |
2717 | void *ptr = &request; | |
2718 | ||
2719 | while (s > 0) { | |
2720 | p = write(fd, ptr, s); | |
2721 | if (p < 0) { | |
2722 | if (errno == EINTR || errno == EAGAIN) | |
2723 | continue; | |
2724 | break; | |
2725 | } | |
2726 | ptr += p; | |
2727 | s -= p; | |
2728 | } | |
a74aeac6 PR |
2729 | close(fd); |
2730 | alarm(0); | |
2731 | return 0; | |
2732 | } | |
2733 | ||
2734 | #ifdef TELINIT_USES_INITLVL | |
2735 | if (request.cmd == INIT_CMD_RUNLVL) { | |
2736 | /* Fallthrough to the old method. */ | |
2737 | ||
2738 | /* Now write the new runlevel. */ | |
2739 | if ((fp = fopen(INITLVL, "w")) == NULL) { | |
2740 | fprintf(stderr, "%s: cannot create %s\n", | |
2741 | progname, INITLVL); | |
2742 | exit(1); | |
2743 | } | |
2744 | fprintf(fp, "%s %d", argv[optind], sltime); | |
2745 | fclose(fp); | |
2746 | ||
2747 | /* And tell init about the pending runlevel change. */ | |
2748 | if (kill(INITPID, SIGHUP) < 0) perror(progname); | |
2749 | ||
2750 | return 0; | |
2751 | } | |
2752 | #endif | |
2753 | ||
2754 | fprintf(stderr, "%s: ", progname); | |
2755 | if (ISMEMBER(got_signals, SIGALRM)) { | |
2756 | fprintf(stderr, "timeout opening/writing control channel %s\n", | |
2757 | INIT_FIFO); | |
2758 | } else { | |
2759 | perror(INIT_FIFO); | |
2760 | } | |
2761 | return 1; | |
2762 | } | |
2763 | ||
2764 | /* | |
2765 | * Main entry for init and telinit. | |
2766 | */ | |
2767 | int main(int argc, char **argv) | |
2768 | { | |
2769 | char *p; | |
2770 | int f; | |
2771 | int isinit; | |
e481cba6 | 2772 | #ifdef WITH_SELINUX |
a74aeac6 | 2773 | int enforce = 0; |
e481cba6 | 2774 | #endif |
a74aeac6 PR |
2775 | |
2776 | /* Get my own name */ | |
2777 | if ((p = strrchr(argv[0], '/')) != NULL) | |
2778 | p++; | |
2779 | else | |
2780 | p = argv[0]; | |
5f959b29 DWF |
2781 | |
2782 | /* Common umask */ | |
a74aeac6 PR |
2783 | umask(022); |
2784 | ||
2785 | /* Quick check */ | |
2786 | if (geteuid() != 0) { | |
2787 | fprintf(stderr, "%s: must be superuser.\n", p); | |
2788 | exit(1); | |
2789 | } | |
2790 | ||
2791 | /* | |
2792 | * Is this telinit or init ? | |
2793 | */ | |
2794 | isinit = (getpid() == 1); | |
2795 | for (f = 1; f < argc; f++) { | |
54cb4b75 | 2796 | if (!strcmp(argv[f], "-i") || !strcmp(argv[f], "--init")) { |
a74aeac6 PR |
2797 | isinit = 1; |
2798 | break; | |
54cb4b75 | 2799 | } |
a74aeac6 PR |
2800 | } |
2801 | if (!isinit) exit(telinit(p, argc, argv)); | |
2802 | ||
2803 | /* | |
2804 | * Check for re-exec | |
2805 | */ | |
2806 | if (check_pipe(STATE_PIPE)) { | |
2807 | ||
2808 | receive_state(STATE_PIPE); | |
2809 | ||
2810 | myname = istrdup(argv[0]); | |
2811 | argv0 = argv[0]; | |
2812 | maxproclen = 0; | |
2813 | for (f = 0; f < argc; f++) | |
2814 | maxproclen += strlen(argv[f]) + 1; | |
2815 | reload = 1; | |
5f959b29 | 2816 | setproctitle("init [%c]", (int)runlevel); |
a74aeac6 PR |
2817 | |
2818 | init_main(); | |
2819 | } | |
2820 | ||
2821 | /* Check command line arguments */ | |
2822 | maxproclen = strlen(argv[0]) + 1; | |
2823 | for(f = 1; f < argc; f++) { | |
2824 | if (!strcmp(argv[f], "single") || !strcmp(argv[f], "-s")) | |
2825 | dfl_level = 'S'; | |
2826 | else if (!strcmp(argv[f], "-a") || !strcmp(argv[f], "auto")) | |
2827 | putenv("AUTOBOOT=YES"); | |
2828 | else if (!strcmp(argv[f], "-b") || !strcmp(argv[f],"emergency")) | |
2829 | emerg_shell = 1; | |
2830 | else if (!strcmp(argv[f], "-z")) { | |
2831 | /* Ignore -z xxx */ | |
2832 | if (argv[f + 1]) f++; | |
2833 | } else if (strchr("0123456789sS", argv[f][0]) | |
2834 | && strlen(argv[f]) == 1) | |
2835 | dfl_level = argv[f][0]; | |
2836 | /* "init u" in the very beginning makes no sense */ | |
2837 | if (dfl_level == 's') dfl_level = 'S'; | |
2838 | maxproclen += strlen(argv[f]) + 1; | |
2839 | } | |
2840 | ||
2841 | #ifdef WITH_SELINUX | |
2842 | if (getenv("SELINUX_INIT") == NULL && !is_selinux_enabled()) { | |
2843 | putenv("SELINUX_INIT=YES"); | |
2844 | if (selinux_init_load_policy(&enforce) == 0 ) { | |
2845 | execv(myname, argv); | |
2846 | } else { | |
2847 | if (enforce > 0) { | |
2848 | /* SELinux in enforcing mode but load_policy failed */ | |
2849 | /* At this point, we probably can't open /dev/console, so log() won't work */ | |
2850 | fprintf(stderr,"Unable to load SELinux Policy. Machine is in enforcing mode. Halting now.\n"); | |
2851 | exit(1); | |
2852 | } | |
2853 | } | |
2854 | } | |
2855 | #endif | |
2856 | /* Start booting. */ | |
2857 | argv0 = argv[0]; | |
2858 | argv[1] = NULL; | |
2859 | setproctitle("init boot"); | |
5f959b29 | 2860 | init_main(); |
a74aeac6 PR |
2861 | |
2862 | /*NOTREACHED*/ | |
2863 | return 0; | |
2864 | } |