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authorDenis Vlasenko <vda.linux@googlemail.com>2007-02-27 19:20:33 +0000
committerDenis Vlasenko <vda.linux@googlemail.com>2007-02-27 19:20:33 +0000
commit966bb4376665e0cf22e64f7901fb956edbd2f1a9 (patch)
treef56f180f61d91368f9af8c49930558d5201551c1 /init/init.c
parentb71675419929a77031559ae5ba6399a0fdc2847b (diff)
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init: de-indent a block of code
Diffstat (limited to 'init/init.c')
-rw-r--r--init/init.c282
1 files changed, 139 insertions, 143 deletions
diff --git a/init/init.c b/init/init.c
index bc8979859..e1ad1e615 100644
--- a/init/init.c
+++ b/init/init.c
@@ -316,7 +316,7 @@ static void open_stdio_to_tty(const char* tty_name, int fail)
316 close(0); 316 close(0);
317 if ((device_open(tty_name, O_RDWR)) < 0) { 317 if ((device_open(tty_name, O_RDWR)) < 0) {
318 dup2(1, 0); /* restore fd #0 - avoid nasty surprises */ 318 dup2(1, 0); /* restore fd #0 - avoid nasty surprises */
319 message(L_LOG | L_CONSOLE, "can't open %s: %s", 319 message(L_LOG | L_CONSOLE, "Can't open %s: %s",
320 tty_name, strerror(errno)); 320 tty_name, strerror(errno));
321 if (fail) 321 if (fail)
322 _exit(1); 322 _exit(1);
@@ -342,178 +342,174 @@ static pid_t run(const struct init_action *a)
342 char *cmd[INIT_BUFFS_SIZE]; 342 char *cmd[INIT_BUFFS_SIZE];
343 char buf[INIT_BUFFS_SIZE + 6]; /* INIT_BUFFS_SIZE+strlen("exec ")+1 */ 343 char buf[INIT_BUFFS_SIZE + 6]; /* INIT_BUFFS_SIZE+strlen("exec ")+1 */
344 sigset_t nmask, omask; 344 sigset_t nmask, omask;
345 static const char press_enter[] =
346#ifdef CUSTOMIZED_BANNER
347#include CUSTOMIZED_BANNER
348#endif
349 "\nPlease press Enter to activate this console. ";
350 345
351 /* Block sigchild while forking. */ 346 /* Block sigchild while forking. */
352 sigemptyset(&nmask); 347 sigemptyset(&nmask);
353 sigaddset(&nmask, SIGCHLD); 348 sigaddset(&nmask, SIGCHLD);
354 sigprocmask(SIG_BLOCK, &nmask, &omask); 349 sigprocmask(SIG_BLOCK, &nmask, &omask);
350 pid = fork();
351 sigprocmask(SIG_SETMASK, &omask, NULL);
355 352
356 if ((pid = fork()) == 0) { 353 if (pid)
357 /* Clean up */ 354 return pid;
358 sigprocmask(SIG_SETMASK, &omask, NULL); 355
359 356 /* Reset signal handlers that were set by the parent process */
360 /* Reset signal handlers that were set by the parent process */ 357 signal(SIGUSR1, SIG_DFL);
361 signal(SIGUSR1, SIG_DFL); 358 signal(SIGUSR2, SIG_DFL);
362 signal(SIGUSR2, SIG_DFL); 359 signal(SIGINT, SIG_DFL);
363 signal(SIGINT, SIG_DFL); 360 signal(SIGTERM, SIG_DFL);
364 signal(SIGTERM, SIG_DFL); 361 signal(SIGHUP, SIG_DFL);
365 signal(SIGHUP, SIG_DFL); 362 signal(SIGQUIT, SIG_DFL);
366 signal(SIGQUIT, SIG_DFL); 363 signal(SIGCONT, SIG_DFL);
367 signal(SIGCONT, SIG_DFL); 364 signal(SIGSTOP, SIG_DFL);
368 signal(SIGSTOP, SIG_DFL); 365 signal(SIGTSTP, SIG_DFL);
369 signal(SIGTSTP, SIG_DFL); 366
370 367 /* Create a new session and make ourself the process
371 /* Create a new session and make ourself the process 368 * group leader */
372 * group leader */ 369 setsid();
373 setsid();
374 370
375 /* Open the new terminal device */ 371 /* Open the new terminal device */
376 open_stdio_to_tty(a->terminal, 1); 372 open_stdio_to_tty(a->terminal, 1);
377 373
378 /* If the init Action requires us to wait, then force the 374 /* If the init Action requires us to wait, then force the
379 * supplied terminal to be the controlling tty. */ 375 * supplied terminal to be the controlling tty. */
380 if (a->action & (SYSINIT | WAIT | CTRLALTDEL | SHUTDOWN | RESTART)) { 376 if (a->action & (SYSINIT | WAIT | CTRLALTDEL | SHUTDOWN | RESTART)) {
381 377
382 /* Now fork off another process to just hang around */ 378 /* Now fork off another process to just hang around */
383 if ((pid = fork()) < 0) { 379 if ((pid = fork()) < 0) {
384 message(L_LOG | L_CONSOLE, "can't fork"); 380 message(L_LOG | L_CONSOLE, "Can't fork");
385 _exit(1); 381 _exit(1);
386 } 382 }
387 383
388 if (pid > 0) { 384 if (pid > 0) {
389 385
390 /* We are the parent -- wait till the child is done */ 386 /* We are the parent -- wait till the child is done */
391 signal(SIGINT, SIG_IGN); 387 signal(SIGINT, SIG_IGN);
392 signal(SIGTSTP, SIG_IGN); 388 signal(SIGTSTP, SIG_IGN);
393 signal(SIGQUIT, SIG_IGN); 389 signal(SIGQUIT, SIG_IGN);
394 signal(SIGCHLD, SIG_DFL); 390 signal(SIGCHLD, SIG_DFL);
395 391
396 waitfor(NULL, pid); 392 waitfor(NULL, pid);
397 /* See if stealing the controlling tty back is necessary */ 393 /* See if stealing the controlling tty back is necessary */
398 if (tcgetpgrp(0) != getpid()) 394 if (tcgetpgrp(0) != getpid())
399 _exit(0); 395 _exit(0);
400 396
401 /* Use a temporary process to steal the controlling tty. */ 397 /* Use a temporary process to steal the controlling tty. */
402 if ((pid = fork()) < 0) { 398 if ((pid = fork()) < 0) {
403 message(L_LOG | L_CONSOLE, "can't fork"); 399 message(L_LOG | L_CONSOLE, "Can't fork");
404 _exit(1); 400 _exit(1);
405 } 401 }
406 if (pid == 0) { 402 if (pid == 0) {
407 setsid(); 403 setsid();
408 ioctl(0, TIOCSCTTY, 1); 404 ioctl(0, TIOCSCTTY, 1);
409 _exit(0);
410 }
411 waitfor(NULL, pid);
412 _exit(0); 405 _exit(0);
413 } 406 }
414 407 waitfor(NULL, pid);
415 /* Now fall though to actually execute things */ 408 _exit(0);
416 } 409 }
417 410
418 /* See if any special /bin/sh requiring characters are present */ 411 /* Now fall though to actually execute things */
419 if (strpbrk(a->command, "~`!$^&*()=|\\{}[];\"'<>?") != NULL) { 412 }
420 cmd[0] = (char *)DEFAULT_SHELL; 413
421 cmd[1] = (char*)"-c"; 414 /* See if any special /bin/sh requiring characters are present */
422 cmd[2] = strcat(strcpy(buf, "exec "), a->command); 415 if (strpbrk(a->command, "~`!$^&*()=|\\{}[];\"'<>?") != NULL) {
423 cmd[3] = NULL; 416 cmd[0] = (char*)DEFAULT_SHELL;
424 } else { 417 cmd[1] = (char*)"-c";
425 /* Convert command (char*) into cmd (char**, one word per string) */ 418 cmd[2] = strcat(strcpy(buf, "exec "), a->command);
426 strcpy(buf, a->command); 419 cmd[3] = NULL;
427 s = buf; 420 } else {
428 for (tmpCmd = buf, i = 0; (tmpCmd = strsep(&s, " \t")) != NULL;) { 421 /* Convert command (char*) into cmd (char**, one word per string) */
429 if (*tmpCmd != '\0') { 422 strcpy(buf, a->command);
430 cmd[i] = tmpCmd; 423 s = buf;
431 i++; 424 for (tmpCmd = buf, i = 0; (tmpCmd = strsep(&s, " \t")) != NULL;) {
432 } 425 if (*tmpCmd != '\0') {
426 cmd[i] = tmpCmd;
427 i++;
433 } 428 }
434 cmd[i] = NULL;
435 } 429 }
430 cmd[i] = NULL;
431 }
436 432
437 cmdpath = cmd[0]; 433 cmdpath = cmd[0];
438 434
439 /* 435 /*
440 * Interactive shells want to see a dash in argv[0]. This 436 * Interactive shells want to see a dash in argv[0]. This
441 * typically is handled by login, argv will be setup this 437 * typically is handled by login, argv will be setup this
442 * way if a dash appears at the front of the command path 438 * way if a dash appears at the front of the command path
443 * (like "-/bin/sh"). 439 * (like "-/bin/sh").
444 */ 440 */
445 if (*cmdpath == '-') { 441 if (*cmdpath == '-') {
446 /* skip over the dash */ 442 /* skip over the dash */
447 ++cmdpath; 443 ++cmdpath;
448 444
449 /* find the last component in the command pathname */ 445 /* find the last component in the command pathname */
450 s = bb_get_last_path_component(cmdpath); 446 s = bb_get_last_path_component(cmdpath);
451 447
452 /* make a new argv[0] */ 448 /* make a new argv[0] */
453 if ((cmd[0] = malloc(strlen(s) + 2)) == NULL) { 449 if ((cmd[0] = malloc(strlen(s) + 2)) == NULL) {
454 message(L_LOG | L_CONSOLE, bb_msg_memory_exhausted); 450 message(L_LOG | L_CONSOLE, bb_msg_memory_exhausted);
455 cmd[0] = cmdpath; 451 cmd[0] = cmdpath;
456 } else { 452 } else {
457 cmd[0][0] = '-'; 453 cmd[0][0] = '-';
458 strcpy(cmd[0] + 1, s); 454 strcpy(cmd[0] + 1, s);
459 } 455 }
460#if ENABLE_FEATURE_INIT_SCTTY 456#if ENABLE_FEATURE_INIT_SCTTY
461 /* Establish this process as session leader and 457 /* Establish this process as session leader and
462 * (attempt) to make the tty (if any) a controlling tty. 458 * (attempt) to make the tty (if any) a controlling tty.
463 */ 459 */
464 setsid(); 460 setsid();
465 ioctl(0, TIOCSCTTY, 0 /*don't steal it*/); 461 ioctl(0, TIOCSCTTY, 0 /*don't steal it*/);
466#endif 462#endif
467 } 463 }
468 464
469#if !defined(__UCLIBC__) || defined(__ARCH_HAS_MMU__) 465#if !defined(__UCLIBC__) || defined(__ARCH_HAS_MMU__)
470 if (a->action & ASKFIRST) { 466 if (a->action & ASKFIRST) {
471 char c; 467 static const char press_enter[] =
472 /* 468#ifdef CUSTOMIZED_BANNER
473 * Save memory by not exec-ing anything large (like a shell) 469#include CUSTOMIZED_BANNER
474 * before the user wants it. This is critical if swap is not
475 * enabled and the system has low memory. Generally this will
476 * be run on the second virtual console, and the first will
477 * be allowed to start a shell or whatever an init script
478 * specifies.
479 */
480 messageD(L_LOG, "Waiting for enter to start '%s'"
481 "(pid %d, tty '%s')\n",
482 cmdpath, getpid(), a->terminal);
483 full_write(1, press_enter, sizeof(press_enter) - 1);
484 while (read(0, &c, 1) == 1 && c != '\n')
485 ;
486 }
487#endif 470#endif
488 471 "\nPlease press Enter to activate this console. ";
489 /* Log the process name and args */ 472 char c;
490 message(L_LOG, "starting pid %d, tty '%s': '%s'", 473 /*
491 getpid(), a->terminal, cmdpath); 474 * Save memory by not exec-ing anything large (like a shell)
475 * before the user wants it. This is critical if swap is not
476 * enabled and the system has low memory. Generally this will
477 * be run on the second virtual console, and the first will
478 * be allowed to start a shell or whatever an init script
479 * specifies.
480 */
481 messageD(L_LOG, "waiting for enter to start '%s'"
482 "(pid %d, tty '%s')\n",
483 cmdpath, getpid(), a->terminal);
484 full_write(1, press_enter, sizeof(press_enter) - 1);
485 while (read(0, &c, 1) == 1 && c != '\n')
486 ;
487 }
488#endif
489 /* Log the process name and args */
490 message(L_LOG, "starting pid %d, tty '%s': '%s'",
491 getpid(), a->terminal, cmdpath);
492 492
493#if ENABLE_FEATURE_INIT_COREDUMPS 493#if ENABLE_FEATURE_INIT_COREDUMPS
494 { 494 {
495 struct stat sb; 495 struct stat sb;
496 if (stat(CORE_ENABLE_FLAG_FILE, &sb) == 0) { 496 if (stat(CORE_ENABLE_FLAG_FILE, &sb) == 0) {
497 struct rlimit limit; 497 struct rlimit limit;
498 498
499 limit.rlim_cur = RLIM_INFINITY; 499 limit.rlim_cur = RLIM_INFINITY;
500 limit.rlim_max = RLIM_INFINITY; 500 limit.rlim_max = RLIM_INFINITY;
501 setrlimit(RLIMIT_CORE, &limit); 501 setrlimit(RLIMIT_CORE, &limit);
502 }
503 } 502 }
504#endif
505
506 /* Now run it. The new program will take over this PID,
507 * so nothing further in init.c should be run. */
508 BB_EXECVP(cmdpath, cmd);
509
510 /* We're still here? Some error happened. */
511 message(L_LOG | L_CONSOLE, "Cannot run '%s': %s",
512 cmdpath, strerror(errno));
513 _exit(-1);
514 } 503 }
515 sigprocmask(SIG_SETMASK, &omask, NULL); 504#endif
516 return pid; 505 /* Now run it. The new program will take over this PID,
506 * so nothing further in init.c should be run. */
507 BB_EXECVP(cmdpath, cmd);
508
509 /* We're still here? Some error happened. */
510 message(L_LOG | L_CONSOLE, "Cannot run '%s': %s",
511 cmdpath, strerror(errno));
512 _exit(-1);
517} 513}
518 514
519static int waitfor(const struct init_action *a, pid_t pid) 515static int waitfor(const struct init_action *a, pid_t pid)
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