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ef416fc2 | 1 | /* |
2 | * "$Id: main.c 4838 2005-11-14 18:34:27Z mike $" | |
3 | * | |
4 | * Scheduler main loop for the Common UNIX Printing System (CUPS). | |
5 | * | |
6 | * Copyright 1997-2005 by Easy Software Products, all rights reserved. | |
7 | * | |
8 | * These coded instructions, statements, and computer programs are the | |
9 | * property of Easy Software Products and are protected by Federal | |
10 | * copyright law. Distribution and use rights are outlined in the file | |
11 | * "LICENSE" which should have been included with this file. If this | |
12 | * file is missing or damaged please contact Easy Software Products | |
13 | * at: | |
14 | * | |
15 | * Attn: CUPS Licensing Information | |
16 | * Easy Software Products | |
17 | * 44141 Airport View Drive, Suite 204 | |
18 | * Hollywood, Maryland 20636 USA | |
19 | * | |
20 | * Voice: (301) 373-9600 | |
21 | * EMail: cups-info@cups.org | |
22 | * WWW: http://www.cups.org | |
23 | * | |
24 | * Contents: | |
25 | * | |
26 | * main() - Main entry for the CUPS scheduler. | |
27 | * cupsdClosePipe() - Close a pipe as necessary. | |
28 | * cupsdOpenPipe() - Create a pipe which is closed on exec. | |
29 | * cupsdCatchChildSignals() - Catch SIGCHLD signals... | |
30 | * cupsdHoldSignals() - Hold child and termination signals. | |
31 | * cupsdIgnoreChildSignals() - Ignore SIGCHLD signals... | |
32 | * cupsdReleaseSignals() - Release signals for delivery. | |
33 | * cupsdSetString() - Set a string value. | |
34 | * cupsdSetStringf() - Set a formatted string value. | |
35 | * parent_handler() - Catch USR1/CHLD signals... | |
36 | * process_children() - Process all dead children... | |
37 | * sigchld_handler() - Handle 'child' signals from old processes. | |
38 | * sighup_handler() - Handle 'hangup' signals to reconfigure the | |
39 | * scheduler. | |
40 | * sigterm_handler() - Handle 'terminate' signals that stop the | |
41 | * scheduler. | |
42 | * select_timeout() - Calculate the select timeout value. | |
43 | * usage() - Show scheduler usage. | |
44 | */ | |
45 | ||
46 | /* | |
47 | * Include necessary headers... | |
48 | */ | |
49 | ||
50 | #define _MAIN_C_ | |
51 | #include "cupsd.h" | |
52 | #include <sys/resource.h> | |
53 | #include <syslog.h> | |
54 | #include <grp.h> | |
55 | ||
56 | #if defined(HAVE_MALLOC_H) && defined(HAVE_MALLINFO) | |
57 | # include <malloc.h> | |
58 | #endif /* HAVE_MALLOC_H && HAVE_MALLINFO */ | |
59 | ||
60 | ||
61 | /* | |
62 | * Local functions... | |
63 | */ | |
64 | ||
65 | static void parent_handler(int sig); | |
66 | static void process_children(void); | |
67 | static void sigchld_handler(int sig); | |
68 | static void sighup_handler(int sig); | |
69 | static void sigterm_handler(int sig); | |
70 | static long select_timeout(int fds); | |
71 | static void usage(void); | |
72 | ||
73 | ||
74 | /* | |
75 | * Local globals... | |
76 | */ | |
77 | ||
78 | static int parent_signal = 0; /* Set to signal number from child */ | |
79 | static int holdcount = 0; /* Number of times "hold" was called */ | |
80 | #if defined(HAVE_SIGACTION) && !defined(HAVE_SIGSET) | |
81 | static sigset_t holdmask; /* Old POSIX signal mask */ | |
82 | #endif /* HAVE_SIGACTION && !HAVE_SIGSET */ | |
83 | static int dead_children = 0; /* Dead children? */ | |
84 | static int stop_scheduler = 0; /* Should the scheduler stop? */ | |
85 | ||
86 | ||
87 | /* | |
88 | * 'main()' - Main entry for the CUPS scheduler. | |
89 | */ | |
90 | ||
91 | int /* O - Exit status */ | |
92 | main(int argc, /* I - Number of command-line arguments */ | |
93 | char *argv[]) /* I - Command-line arguments */ | |
94 | { | |
95 | int i; /* Looping var */ | |
96 | char *opt; /* Option character */ | |
97 | int fg; /* Run in the foreground */ | |
98 | int fds; /* Number of ready descriptors select returns */ | |
99 | fd_set *input, /* Input set for select() */ | |
100 | *output; /* Output set for select() */ | |
101 | cupsd_client_t *con; /* Current client */ | |
102 | cupsd_job_t *job; /* Current job */ | |
103 | cupsd_listener_t *lis; /* Current listener */ | |
104 | time_t current_time, /* Current time */ | |
105 | activity, /* Activity timer */ | |
106 | browse_time, /* Next browse send time */ | |
107 | senddoc_time, /* Send-Document time */ | |
108 | expire_time; /* Subscription expire time */ | |
109 | #ifdef HAVE_MALLINFO | |
110 | time_t mallinfo_time; /* Malloc information time */ | |
111 | #endif /* HAVE_MALLINFO */ | |
112 | struct timeval timeout; /* select() timeout */ | |
113 | struct rlimit limit; /* Runtime limit */ | |
114 | #if defined(HAVE_SIGACTION) && !defined(HAVE_SIGSET) | |
115 | struct sigaction action; /* Actions for POSIX signals */ | |
116 | #endif /* HAVE_SIGACTION && !HAVE_SIGSET */ | |
117 | #ifdef __sgi | |
118 | cups_file_t *fp; /* Fake lpsched lock file */ | |
119 | struct stat statbuf; /* Needed for checking lpsched FIFO */ | |
120 | #endif /* __sgi */ | |
121 | ||
122 | ||
123 | /* | |
124 | * Check for command-line arguments... | |
125 | */ | |
126 | ||
127 | fg = 0; | |
128 | ||
129 | for (i = 1; i < argc; i ++) | |
130 | if (argv[i][0] == '-') | |
131 | for (opt = argv[i] + 1; *opt != '\0'; opt ++) | |
132 | switch (*opt) | |
133 | { | |
134 | case 'c' : /* Configuration file */ | |
135 | i ++; | |
136 | if (i >= argc) | |
137 | usage(); | |
138 | ||
139 | if (argv[i][0] == '/') | |
140 | { | |
141 | /* | |
142 | * Absolute directory... | |
143 | */ | |
144 | ||
145 | cupsdSetString(&ConfigurationFile, argv[i]); | |
146 | } | |
147 | else | |
148 | { | |
149 | /* | |
150 | * Relative directory... | |
151 | */ | |
152 | ||
153 | char current[1024]; /* Current directory */ | |
154 | ||
155 | ||
156 | getcwd(current, sizeof(current)); | |
157 | cupsdSetStringf(&ConfigurationFile, "%s/%s", current, argv[i]); | |
158 | } | |
159 | break; | |
160 | ||
161 | case 'f' : /* Run in foreground... */ | |
162 | fg = 1; | |
163 | break; | |
164 | ||
165 | case 'F' : /* Run in foreground, but still disconnect from terminal... */ | |
166 | fg = -1; | |
167 | break; | |
168 | ||
169 | default : /* Unknown option */ | |
170 | fprintf(stderr, "cupsd: Unknown option \'%c\' - aborting!\n", | |
171 | *opt); | |
172 | usage(); | |
173 | break; | |
174 | } | |
175 | else | |
176 | { | |
177 | fprintf(stderr, "cupsd: Unknown argument \'%s\' - aborting!\n", argv[i]); | |
178 | usage(); | |
179 | } | |
180 | ||
181 | if (!ConfigurationFile) | |
182 | cupsdSetString(&ConfigurationFile, CUPS_SERVERROOT "/cupsd.conf"); | |
183 | ||
184 | /* | |
185 | * If the user hasn't specified "-f", run in the background... | |
186 | */ | |
187 | ||
188 | if (!fg) | |
189 | { | |
190 | /* | |
191 | * Setup signal handlers for the parent... | |
192 | */ | |
193 | ||
194 | #ifdef HAVE_SIGSET /* Use System V signals over POSIX to avoid bugs */ | |
195 | sigset(SIGUSR1, parent_handler); | |
196 | sigset(SIGCHLD, parent_handler); | |
197 | ||
198 | sigset(SIGHUP, SIG_IGN); | |
199 | #elif defined(HAVE_SIGACTION) | |
200 | memset(&action, 0, sizeof(action)); | |
201 | sigemptyset(&action.sa_mask); | |
202 | sigaddset(&action.sa_mask, SIGUSR1); | |
203 | action.sa_handler = parent_handler; | |
204 | sigaction(SIGUSR1, &action, NULL); | |
205 | sigaction(SIGCHLD, &action, NULL); | |
206 | ||
207 | sigemptyset(&action.sa_mask); | |
208 | action.sa_handler = SIG_IGN; | |
209 | sigaction(SIGHUP, &action, NULL); | |
210 | #else | |
211 | signal(SIGUSR1, parent_handler); | |
212 | signal(SIGCLD, parent_handler); | |
213 | ||
214 | signal(SIGHUP, SIG_IGN); | |
215 | #endif /* HAVE_SIGSET */ | |
216 | ||
217 | if (fork() > 0) | |
218 | { | |
219 | /* | |
220 | * OK, wait for the child to startup and send us SIGUSR1 or to crash | |
221 | * and the OS send us SIGCHLD... We also need to ignore SIGHUP which | |
222 | * might be sent by the init script to restart the scheduler... | |
223 | */ | |
224 | ||
225 | for (; parent_signal == 0;) | |
226 | sleep(1); | |
227 | ||
228 | if (parent_signal == SIGUSR1) | |
229 | return (0); | |
230 | ||
231 | if (wait(&i) < 0) | |
232 | { | |
233 | perror("cupsd"); | |
234 | return (1); | |
235 | } | |
236 | else if (WIFEXITED(i)) | |
237 | { | |
238 | fprintf(stderr, "cupsd: Child exited with status %d!\n", WEXITSTATUS(i)); | |
239 | return (2); | |
240 | } | |
241 | else | |
242 | { | |
243 | fprintf(stderr, "cupsd: Child exited on signal %d!\n", WTERMSIG(i)); | |
244 | return (3); | |
245 | } | |
246 | } | |
247 | } | |
248 | ||
249 | if (fg < 1) | |
250 | { | |
251 | /* | |
252 | * Make sure we aren't tying up any filesystems... | |
253 | */ | |
254 | ||
255 | chdir("/"); | |
256 | ||
257 | #ifndef DEBUG | |
258 | /* | |
259 | * Disable core dumps... | |
260 | */ | |
261 | ||
262 | getrlimit(RLIMIT_CORE, &limit); | |
263 | limit.rlim_cur = 0; | |
264 | setrlimit(RLIMIT_CORE, &limit); | |
265 | ||
266 | /* | |
267 | * Disconnect from the controlling terminal... | |
268 | */ | |
269 | ||
270 | setsid(); | |
271 | ||
272 | /* | |
273 | * Close all open files... | |
274 | */ | |
275 | ||
276 | getrlimit(RLIMIT_NOFILE, &limit); | |
277 | ||
278 | for (i = 0; i < limit.rlim_cur; i ++) | |
279 | close(i); | |
280 | #endif /* DEBUG */ | |
281 | } | |
282 | ||
283 | /* | |
284 | * Set the timezone info... | |
285 | */ | |
286 | ||
287 | tzset(); | |
288 | ||
289 | #ifdef LC_TIME | |
290 | setlocale(LC_TIME, ""); | |
291 | #endif /* LC_TIME */ | |
292 | ||
293 | /* | |
294 | * Set the maximum number of files... | |
295 | */ | |
296 | ||
297 | getrlimit(RLIMIT_NOFILE, &limit); | |
298 | ||
299 | if (limit.rlim_max > CUPS_MAX_FDS) | |
300 | MaxFDs = CUPS_MAX_FDS; | |
301 | else | |
302 | MaxFDs = limit.rlim_max; | |
303 | ||
304 | limit.rlim_cur = MaxFDs; | |
305 | ||
306 | setrlimit(RLIMIT_NOFILE, &limit); | |
307 | ||
308 | /* | |
309 | * Allocate memory for the input and output sets... | |
310 | */ | |
311 | ||
312 | SetSize = (MaxFDs + 31) / 8 + 4; | |
313 | if (SetSize < sizeof(fd_set)) | |
314 | SetSize = sizeof(fd_set); | |
315 | ||
316 | InputSet = (fd_set *)calloc(1, SetSize); | |
317 | OutputSet = (fd_set *)calloc(1, SetSize); | |
318 | input = (fd_set *)calloc(1, SetSize); | |
319 | output = (fd_set *)calloc(1, SetSize); | |
320 | ||
321 | if (InputSet == NULL || OutputSet == NULL || input == NULL || output == NULL) | |
322 | { | |
323 | syslog(LOG_LPR, "Unable to allocate memory for select() sets - exiting!"); | |
324 | return (1); | |
325 | } | |
326 | ||
327 | /* | |
328 | * Read configuration... | |
329 | */ | |
330 | ||
331 | if (!cupsdReadConfiguration()) | |
332 | { | |
333 | syslog(LOG_LPR, "Unable to read configuration file \'%s\' - exiting!", | |
334 | ConfigurationFile); | |
335 | return (1); | |
336 | } | |
337 | ||
338 | /* | |
339 | * Catch hangup and child signals and ignore broken pipes... | |
340 | */ | |
341 | ||
342 | #ifdef HAVE_SIGSET /* Use System V signals over POSIX to avoid bugs */ | |
343 | if (RunAsUser) | |
344 | sigset(SIGHUP, sigterm_handler); | |
345 | else | |
346 | sigset(SIGHUP, sighup_handler); | |
347 | ||
348 | sigset(SIGPIPE, SIG_IGN); | |
349 | sigset(SIGTERM, sigterm_handler); | |
350 | #elif defined(HAVE_SIGACTION) | |
351 | memset(&action, 0, sizeof(action)); | |
352 | ||
353 | sigemptyset(&action.sa_mask); | |
354 | sigaddset(&action.sa_mask, SIGHUP); | |
355 | ||
356 | if (RunAsUser) | |
357 | action.sa_handler = sigterm_handler; | |
358 | else | |
359 | action.sa_handler = sighup_handler; | |
360 | ||
361 | sigaction(SIGHUP, &action, NULL); | |
362 | ||
363 | sigemptyset(&action.sa_mask); | |
364 | action.sa_handler = SIG_IGN; | |
365 | sigaction(SIGPIPE, &action, NULL); | |
366 | ||
367 | sigemptyset(&action.sa_mask); | |
368 | sigaddset(&action.sa_mask, SIGTERM); | |
369 | sigaddset(&action.sa_mask, SIGCHLD); | |
370 | action.sa_handler = sigterm_handler; | |
371 | sigaction(SIGTERM, &action, NULL); | |
372 | #else | |
373 | if (RunAsUser) | |
374 | signal(SIGHUP, sigterm_handler); | |
375 | else | |
376 | signal(SIGHUP, sighup_handler); | |
377 | ||
378 | signal(SIGPIPE, SIG_IGN); | |
379 | signal(SIGTERM, sigterm_handler); | |
380 | #endif /* HAVE_SIGSET */ | |
381 | ||
382 | #ifdef __sgi | |
383 | /* | |
384 | * Try to create a fake lpsched lock file if one is not already there. | |
385 | * Some Adobe applications need it under IRIX in order to enable | |
386 | * printing... | |
387 | */ | |
388 | ||
389 | if ((fp = cupsFileOpen("/var/spool/lp/SCHEDLOCK", "w")) == NULL) | |
390 | { | |
391 | syslog(LOG_LPR, "Unable to create fake lpsched lock file " | |
392 | "\"/var/spool/lp/SCHEDLOCK\"\' - %s!", | |
393 | strerror(errno)); | |
394 | } | |
395 | else | |
396 | { | |
397 | fchmod(cupsFileNumber(fp), 0644); | |
398 | fchown(cupsFileNumber(fp), User, Group); | |
399 | ||
400 | cupsFileClose(fp); | |
401 | } | |
402 | #endif /* __sgi */ | |
403 | ||
404 | /* | |
405 | * Initialize authentication certificates... | |
406 | */ | |
407 | ||
408 | cupsdInitCerts(); | |
409 | ||
410 | /* | |
411 | * If we are running in the background, signal the parent process that | |
412 | * we are up and running... | |
413 | */ | |
414 | ||
415 | if (!fg) | |
416 | { | |
417 | /* | |
418 | * Send a signal to the parent process, but only if the parent is | |
419 | * not PID 1 (init). This avoids accidentally shutting down the | |
420 | * system on OpenBSD if you CTRL-C the server before it is up... | |
421 | */ | |
422 | ||
423 | i = getppid(); /* Save parent PID to avoid race condition */ | |
424 | ||
425 | if (i != 1) | |
426 | kill(i, SIGUSR1); | |
427 | } | |
428 | ||
429 | /* | |
430 | * If the administrator has configured the server to run as an unpriviledged | |
431 | * user, change to that user now... | |
432 | */ | |
433 | ||
434 | if (RunAsUser) | |
435 | { | |
436 | setgid(Group); | |
437 | setgroups(1, &Group); | |
438 | setuid(User); | |
439 | } | |
440 | ||
441 | /* | |
442 | * Catch signals... | |
443 | */ | |
444 | ||
445 | cupsdCatchChildSignals(); | |
446 | ||
447 | /* | |
448 | * Start any pending print jobs... | |
449 | */ | |
450 | ||
451 | cupsdCheckJobs(); | |
452 | ||
453 | /* | |
454 | * Loop forever... | |
455 | */ | |
456 | ||
457 | #ifdef HAVE_MALLINFO | |
458 | mallinfo_time = 0; | |
459 | #endif /* HAVE_MALLINFO */ | |
460 | browse_time = time(NULL); | |
461 | senddoc_time = time(NULL); | |
462 | expire_time = time(NULL); | |
463 | fds = 1; | |
464 | ||
465 | while (!stop_scheduler) | |
466 | { | |
467 | #ifdef DEBUG | |
468 | cupsdLogMessage(CUPSD_LOG_DEBUG2, | |
469 | "main: Top of loop, dead_children=%d, NeedReload=%d", | |
470 | dead_children, NeedReload); | |
471 | #endif /* DEBUG */ | |
472 | ||
473 | /* | |
474 | * Check if there are dead children to handle... | |
475 | */ | |
476 | ||
477 | if (dead_children) | |
478 | process_children(); | |
479 | ||
480 | /* | |
481 | * Check if we need to load the server configuration file... | |
482 | */ | |
483 | ||
484 | if (NeedReload) | |
485 | { | |
486 | /* | |
487 | * Close any idle clients... | |
488 | */ | |
489 | ||
490 | if (NumClients > 0) | |
491 | { | |
492 | for (i = NumClients, con = Clients; i > 0; i --, con ++) | |
493 | if (con->http.state == HTTP_WAITING) | |
494 | { | |
495 | cupsdCloseClient(con); | |
496 | con --; | |
497 | } | |
498 | else | |
499 | con->http.keep_alive = HTTP_KEEPALIVE_OFF; | |
500 | ||
501 | cupsdPauseListening(); | |
502 | } | |
503 | ||
504 | /* | |
505 | * Check for any active jobs... | |
506 | */ | |
507 | ||
508 | for (job = (cupsd_job_t *)cupsArrayFirst(ActiveJobs); | |
509 | job; | |
510 | job = (cupsd_job_t *)cupsArrayNext(ActiveJobs)) | |
511 | if (job->state->values[0].integer == IPP_JOB_PROCESSING) | |
512 | break; | |
513 | ||
514 | /* | |
515 | * Restart if all clients are closed and all jobs finished, or | |
516 | * if the reload timeout has elapsed... | |
517 | */ | |
518 | ||
519 | if ((NumClients == 0 && (!job || NeedReload != RELOAD_ALL)) || | |
520 | (time(NULL) - ReloadTime) >= ReloadTimeout) | |
521 | { | |
522 | if (!cupsdReadConfiguration()) | |
523 | { | |
524 | syslog(LOG_LPR, "Unable to read configuration file \'%s\' - exiting!", | |
525 | ConfigurationFile); | |
526 | break; | |
527 | } | |
528 | } | |
529 | } | |
530 | ||
531 | /* | |
532 | * Check for available input or ready output. If select() returns | |
533 | * 0 or -1, something bad happened and we should exit immediately. | |
534 | * | |
535 | * Note that we at least have one listening socket open at all | |
536 | * times. | |
537 | */ | |
538 | ||
539 | memcpy(input, InputSet, SetSize); | |
540 | memcpy(output, OutputSet, SetSize); | |
541 | ||
542 | timeout.tv_sec = select_timeout(fds); | |
543 | timeout.tv_usec = 0; | |
544 | ||
545 | if ((fds = select(MaxFDs, input, output, NULL, &timeout)) < 0) | |
546 | { | |
547 | char s[16384], /* String buffer */ | |
548 | *sptr; /* Pointer into buffer */ | |
549 | int slen; /* Length of string buffer */ | |
550 | ||
551 | ||
552 | /* | |
553 | * Got an error from select! | |
554 | */ | |
555 | ||
556 | if (errno == EINTR) /* Just interrupted by a signal */ | |
557 | continue; | |
558 | ||
559 | /* | |
560 | * Log all sorts of debug info to help track down the problem. | |
561 | */ | |
562 | ||
563 | cupsdLogMessage(CUPSD_LOG_EMERG, "select() failed - %s!", | |
564 | strerror(errno)); | |
565 | ||
566 | strcpy(s, "InputSet ="); | |
567 | slen = 10; | |
568 | sptr = s + 10; | |
569 | ||
570 | for (i = 0; i < MaxFDs; i ++) | |
571 | if (FD_ISSET(i, InputSet)) | |
572 | { | |
573 | snprintf(sptr, sizeof(s) - slen, " %d", i); | |
574 | slen += strlen(sptr); | |
575 | sptr += strlen(sptr); | |
576 | } | |
577 | ||
578 | cupsdLogMessage(CUPSD_LOG_EMERG, s); | |
579 | ||
580 | strcpy(s, "OutputSet ="); | |
581 | slen = 11; | |
582 | sptr = s + 11; | |
583 | ||
584 | for (i = 0; i < MaxFDs; i ++) | |
585 | if (FD_ISSET(i, OutputSet)) | |
586 | { | |
587 | snprintf(sptr, sizeof(s) - slen, " %d", i); | |
588 | slen += strlen(sptr); | |
589 | sptr += strlen(sptr); | |
590 | } | |
591 | ||
592 | cupsdLogMessage(CUPSD_LOG_EMERG, s); | |
593 | ||
594 | for (i = 0, con = Clients; i < NumClients; i ++, con ++) | |
595 | cupsdLogMessage(CUPSD_LOG_EMERG, | |
596 | "Clients[%d] = %d, file = %d, state = %d", | |
597 | i, con->http.fd, con->file, con->http.state); | |
598 | ||
599 | for (i = 0, lis = Listeners; i < NumListeners; i ++, lis ++) | |
600 | cupsdLogMessage(CUPSD_LOG_EMERG, "Listeners[%d] = %d", i, lis->fd); | |
601 | ||
602 | cupsdLogMessage(CUPSD_LOG_EMERG, "BrowseSocket = %d", BrowseSocket); | |
603 | ||
604 | for (job = (cupsd_job_t *)cupsArrayFirst(ActiveJobs); | |
605 | job; | |
606 | job = (cupsd_job_t *)cupsArrayNext(ActiveJobs)) | |
607 | cupsdLogMessage(CUPSD_LOG_EMERG, "Jobs[%d] = %d < [%d %d] > [%d %d]", | |
608 | job->id, | |
609 | job->status_buffer ? job->status_buffer->fd : -1, | |
610 | job->print_pipes[0], job->print_pipes[1], | |
611 | job->back_pipes[0], job->back_pipes[1]); | |
612 | break; | |
613 | } | |
614 | ||
615 | current_time = time(NULL); | |
616 | ||
617 | /* | |
618 | * Check for status info from job filters... | |
619 | */ | |
620 | ||
621 | for (job = (cupsd_job_t *)cupsArrayFirst(ActiveJobs); | |
622 | job; | |
623 | job = (cupsd_job_t *)cupsArrayNext(ActiveJobs)) | |
624 | if (job->status_buffer && FD_ISSET(job->status_buffer->fd, input)) | |
625 | { | |
626 | /* | |
627 | * Clear the input bit to avoid updating the next job | |
628 | * using the same status pipe file descriptor... | |
629 | */ | |
630 | ||
631 | FD_CLR(job->status_buffer->fd, input); | |
632 | ||
633 | /* | |
634 | * Read any status messages from the filters... | |
635 | */ | |
636 | ||
637 | cupsdUpdateJob(job); | |
638 | } | |
639 | ||
640 | /* | |
641 | * Update CGI messages as needed... | |
642 | */ | |
643 | ||
644 | if (CGIPipes[0] >= 0 && FD_ISSET(CGIPipes[0], input)) | |
645 | cupsdUpdateCGI(); | |
646 | ||
647 | /* | |
648 | * Update notifier messages as needed... | |
649 | */ | |
650 | ||
651 | if (NotifierPipes[0] >= 0 && FD_ISSET(NotifierPipes[0], input)) | |
652 | cupsdUpdateNotifierStatus(); | |
653 | ||
654 | /* | |
655 | * Expire subscriptions as needed... | |
656 | */ | |
657 | ||
658 | if (cupsArrayCount(Subscriptions) > 0 && current_time > expire_time) | |
659 | { | |
660 | cupsdExpireSubscriptions(NULL, NULL); | |
661 | ||
662 | expire_time = current_time; | |
663 | } | |
664 | ||
665 | /* | |
666 | * Update the browse list as needed... | |
667 | */ | |
668 | ||
669 | if (Browsing && (BrowseLocalProtocols | BrowseRemoteProtocols)) | |
670 | { | |
671 | if (BrowseSocket >= 0 && FD_ISSET(BrowseSocket, input)) | |
672 | cupsdUpdateCUPSBrowse(); | |
673 | ||
674 | if (PollPipe >= 0 && FD_ISSET(PollPipe, input)) | |
675 | cupsdUpdatePolling(); | |
676 | ||
677 | #ifdef HAVE_LIBSLP | |
678 | if (((BrowseLocalProtocols | BrowseRemoteProtocols) & BROWSE_SLP) && | |
679 | BrowseSLPRefresh <= current_time) | |
680 | cupsdUpdateSLPBrowse(); | |
681 | #endif /* HAVE_LIBSLP */ | |
682 | ||
683 | if (current_time > browse_time) | |
684 | { | |
685 | cupsdSendBrowseList(); | |
686 | browse_time = current_time; | |
687 | } | |
688 | } | |
689 | ||
690 | /* | |
691 | * Check for new connections on the "listen" sockets... | |
692 | */ | |
693 | ||
694 | for (i = NumListeners, lis = Listeners; i > 0; i --, lis ++) | |
695 | if (lis->fd >= 0 && FD_ISSET(lis->fd, input)) | |
696 | { | |
697 | FD_CLR(lis->fd, input); | |
698 | cupsdAcceptClient(lis); | |
699 | } | |
700 | ||
701 | /* | |
702 | * Check for new data on the client sockets... | |
703 | */ | |
704 | ||
705 | for (i = NumClients, con = Clients; i > 0; i --, con ++) | |
706 | { | |
707 | /* | |
708 | * Process the input buffer... | |
709 | */ | |
710 | ||
711 | if (FD_ISSET(con->http.fd, input) || con->http.used) | |
712 | { | |
713 | FD_CLR(con->http.fd, input); | |
714 | ||
715 | if (!cupsdReadClient(con)) | |
716 | { | |
717 | if (con->pipe_pid) | |
718 | FD_CLR(con->file, input); | |
719 | ||
720 | con --; | |
721 | continue; | |
722 | } | |
723 | } | |
724 | ||
725 | /* | |
726 | * Write data as needed... | |
727 | */ | |
728 | ||
729 | if (con->pipe_pid && FD_ISSET(con->file, input)) | |
730 | { | |
731 | /* | |
732 | * Keep track of pending input from the file/pipe separately | |
733 | * so that we don't needlessly spin on select() when the web | |
734 | * client is not ready to receive data... | |
735 | */ | |
736 | ||
737 | FD_CLR(con->file, input); | |
738 | con->file_ready = 1; | |
739 | ||
740 | #ifdef DEBUG | |
741 | cupsdLogMessage(CUPSD_LOG_DEBUG2, "main: Data ready file %d!", | |
742 | con->file); | |
743 | #endif /* DEBUG */ | |
744 | ||
745 | if (!FD_ISSET(con->http.fd, output)) | |
746 | { | |
747 | cupsdLogMessage(CUPSD_LOG_DEBUG2, | |
748 | "main: Removing fd %d from InputSet...", con->file); | |
749 | FD_CLR(con->file, InputSet); | |
750 | } | |
751 | } | |
752 | ||
753 | if (FD_ISSET(con->http.fd, output)) | |
754 | { | |
755 | FD_CLR(con->http.fd, output); | |
756 | ||
757 | if (!con->pipe_pid || con->file_ready) | |
758 | if (!cupsdWriteClient(con)) | |
759 | { | |
760 | con --; | |
761 | continue; | |
762 | } | |
763 | } | |
764 | ||
765 | /* | |
766 | * Check the activity and close old clients... | |
767 | */ | |
768 | ||
769 | activity = current_time - Timeout; | |
770 | if (con->http.activity < activity && !con->pipe_pid) | |
771 | { | |
772 | cupsdLogMessage(CUPSD_LOG_DEBUG, | |
773 | "Closing client %d after %d seconds of inactivity...", | |
774 | con->http.fd, Timeout); | |
775 | ||
776 | cupsdCloseClient(con); | |
777 | con --; | |
778 | continue; | |
779 | } | |
780 | } | |
781 | ||
782 | /* | |
783 | * Update any pending multi-file documents... | |
784 | */ | |
785 | ||
786 | if ((current_time - senddoc_time) >= 10) | |
787 | { | |
788 | cupsdCheckJobs(); | |
789 | senddoc_time = current_time; | |
790 | } | |
791 | ||
792 | #ifdef HAVE_MALLINFO | |
793 | /* | |
794 | * Log memory usage every minute... | |
795 | */ | |
796 | ||
797 | if ((current_time - mallinfo_time) >= 60 && LogLevel >= CUPSD_LOG_DEBUG) | |
798 | { | |
799 | struct mallinfo mem; /* Malloc information */ | |
800 | ||
801 | ||
802 | mem = mallinfo(); | |
803 | cupsdLogMessage(CUPSD_LOG_DEBUG, | |
804 | "mallinfo: arena = %d, used = %d, free = %d\n", | |
805 | mem.arena, mem.usmblks + mem.uordblks, | |
806 | mem.fsmblks + mem.fordblks); | |
807 | mallinfo_time = current_time; | |
808 | } | |
809 | #endif /* HAVE_MALLINFO */ | |
810 | ||
811 | /* | |
812 | * Update the root certificate once every 5 minutes... | |
813 | */ | |
814 | ||
815 | if ((current_time - RootCertTime) >= RootCertDuration && RootCertDuration && | |
816 | !RunUser) | |
817 | { | |
818 | /* | |
819 | * Update the root certificate... | |
820 | */ | |
821 | ||
822 | cupsdDeleteCert(0); | |
823 | cupsdAddCert(0, "root"); | |
824 | } | |
825 | } | |
826 | ||
827 | /* | |
828 | * Log a message based on what happened... | |
829 | */ | |
830 | ||
831 | if (stop_scheduler) | |
832 | cupsdLogMessage(CUPSD_LOG_INFO, "Scheduler shutting down normally."); | |
833 | else | |
834 | cupsdLogMessage(CUPSD_LOG_ERROR, | |
835 | "Scheduler shutting down due to program error."); | |
836 | ||
837 | /* | |
838 | * Close all network clients and stop all jobs... | |
839 | */ | |
840 | ||
841 | cupsdStopServer(); | |
842 | ||
843 | cupsdStopAllJobs(); | |
844 | ||
845 | #ifdef __sgi | |
846 | /* | |
847 | * Remove the fake IRIX lpsched lock file, but only if the existing | |
848 | * file is not a FIFO which indicates that the real IRIX lpsched is | |
849 | * running... | |
850 | */ | |
851 | ||
852 | if (!stat("/var/spool/lp/FIFO", &statbuf)) | |
853 | if (!S_ISFIFO(statbuf.st_mode)) | |
854 | unlink("/var/spool/lp/SCHEDLOCK"); | |
855 | #endif /* __sgi */ | |
856 | ||
857 | /* | |
858 | * Free memory used by FD sets and return... | |
859 | */ | |
860 | ||
861 | free(InputSet); | |
862 | free(OutputSet); | |
863 | free(input); | |
864 | free(output); | |
865 | ||
866 | return (!stop_scheduler); | |
867 | } | |
868 | ||
869 | ||
870 | /* | |
871 | * 'cupsdClosePipe()' - Close a pipe as necessary. | |
872 | */ | |
873 | ||
874 | void | |
875 | cupsdClosePipe(int *fds) /* I - Pipe file descriptors (2) */ | |
876 | { | |
877 | /* | |
878 | * Close file descriptors as needed... | |
879 | */ | |
880 | ||
881 | if (fds[0] >= 0) | |
882 | { | |
883 | close(fds[0]); | |
884 | fds[0] = -1; | |
885 | } | |
886 | ||
887 | if (fds[1] >= 0) | |
888 | { | |
889 | close(fds[1]); | |
890 | fds[1] = -1; | |
891 | } | |
892 | } | |
893 | ||
894 | ||
895 | /* | |
896 | * 'cupsdOpenPipe()' - Create a pipe which is closed on exec. | |
897 | */ | |
898 | ||
899 | int /* O - 0 on success, -1 on error */ | |
900 | cupsdOpenPipe(int *fds) /* O - Pipe file descriptors (2) */ | |
901 | { | |
902 | /* | |
903 | * Create the pipe... | |
904 | */ | |
905 | ||
906 | if (pipe(fds)) | |
907 | return (-1); | |
908 | ||
909 | /* | |
910 | * Set the "close on exec" flag on each end of the pipe... | |
911 | */ | |
912 | ||
913 | if (fcntl(fds[0], F_SETFD, fcntl(fds[0], F_GETFD) | FD_CLOEXEC)) | |
914 | { | |
915 | close(fds[0]); | |
916 | close(fds[1]); | |
917 | return (-1); | |
918 | } | |
919 | ||
920 | if (fcntl(fds[1], F_SETFD, fcntl(fds[1], F_GETFD) | FD_CLOEXEC)) | |
921 | { | |
922 | close(fds[0]); | |
923 | close(fds[1]); | |
924 | return (-1); | |
925 | } | |
926 | ||
927 | /* | |
928 | * Return 0 indicating success... | |
929 | */ | |
930 | ||
931 | return (0); | |
932 | } | |
933 | ||
934 | ||
935 | /* | |
936 | * 'cupsdCatchChildSignals()' - Catch SIGCHLD signals... | |
937 | */ | |
938 | ||
939 | void | |
940 | cupsdCatchChildSignals(void) | |
941 | { | |
942 | #if defined(HAVE_SIGACTION) && !defined(HAVE_SIGSET) | |
943 | struct sigaction action; /* Actions for POSIX signals */ | |
944 | #endif /* HAVE_SIGACTION && !HAVE_SIGSET */ | |
945 | ||
946 | ||
947 | #ifdef HAVE_SIGSET /* Use System V signals over POSIX to avoid bugs */ | |
948 | sigset(SIGCHLD, sigchld_handler); | |
949 | #elif defined(HAVE_SIGACTION) | |
950 | memset(&action, 0, sizeof(action)); | |
951 | ||
952 | sigemptyset(&action.sa_mask); | |
953 | sigaddset(&action.sa_mask, SIGTERM); | |
954 | sigaddset(&action.sa_mask, SIGCHLD); | |
955 | action.sa_handler = sigchld_handler; | |
956 | sigaction(SIGCHLD, &action, NULL); | |
957 | #else | |
958 | signal(SIGCLD, sigchld_handler); /* No, SIGCLD isn't a typo... */ | |
959 | #endif /* HAVE_SIGSET */ | |
960 | } | |
961 | ||
962 | ||
963 | /* | |
964 | * 'cupsdClearString()' - Clear a string. | |
965 | */ | |
966 | ||
967 | void | |
968 | cupsdClearString(char **s) /* O - String value */ | |
969 | { | |
970 | if (s && *s) | |
971 | { | |
972 | free(*s); | |
973 | *s = NULL; | |
974 | } | |
975 | } | |
976 | ||
977 | ||
978 | /* | |
979 | * 'cupsdHoldSignals()' - Hold child and termination signals. | |
980 | */ | |
981 | ||
982 | void | |
983 | cupsdHoldSignals(void) | |
984 | { | |
985 | #if defined(HAVE_SIGACTION) && !defined(HAVE_SIGSET) | |
986 | sigset_t newmask; /* New POSIX signal mask */ | |
987 | #endif /* HAVE_SIGACTION && !HAVE_SIGSET */ | |
988 | ||
989 | ||
990 | holdcount ++; | |
991 | if (holdcount > 1) | |
992 | return; | |
993 | ||
994 | #ifdef HAVE_SIGSET | |
995 | sighold(SIGTERM); | |
996 | sighold(SIGCHLD); | |
997 | #elif defined(HAVE_SIGACTION) | |
998 | sigemptyset(&newmask); | |
999 | sigaddset(&newmask, SIGTERM); | |
1000 | sigaddset(&newmask, SIGCHLD); | |
1001 | sigprocmask(SIG_BLOCK, &newmask, &holdmask); | |
1002 | #endif /* HAVE_SIGSET */ | |
1003 | } | |
1004 | ||
1005 | ||
1006 | /* | |
1007 | * 'cupsdIgnoreChildSignals()' - Ignore SIGCHLD signals... | |
1008 | * | |
1009 | * We don't really ignore them, we set the signal handler to SIG_DFL, | |
1010 | * since some OS's rely on signals for the wait4() function to work. | |
1011 | */ | |
1012 | ||
1013 | void | |
1014 | cupsdIgnoreChildSignals(void) | |
1015 | { | |
1016 | #if defined(HAVE_SIGACTION) && !defined(HAVE_SIGSET) | |
1017 | struct sigaction action; /* Actions for POSIX signals */ | |
1018 | #endif /* HAVE_SIGACTION && !HAVE_SIGSET */ | |
1019 | ||
1020 | ||
1021 | #ifdef HAVE_SIGSET /* Use System V signals over POSIX to avoid bugs */ | |
1022 | sigset(SIGCHLD, SIG_DFL); | |
1023 | #elif defined(HAVE_SIGACTION) | |
1024 | memset(&action, 0, sizeof(action)); | |
1025 | ||
1026 | sigemptyset(&action.sa_mask); | |
1027 | sigaddset(&action.sa_mask, SIGCHLD); | |
1028 | action.sa_handler = SIG_DFL; | |
1029 | sigaction(SIGCHLD, &action, NULL); | |
1030 | #else | |
1031 | signal(SIGCLD, SIG_DFL); /* No, SIGCLD isn't a typo... */ | |
1032 | #endif /* HAVE_SIGSET */ | |
1033 | } | |
1034 | ||
1035 | ||
1036 | /* | |
1037 | * 'cupsdReleaseSignals()' - Release signals for delivery. | |
1038 | */ | |
1039 | ||
1040 | void | |
1041 | cupsdReleaseSignals(void) | |
1042 | { | |
1043 | holdcount --; | |
1044 | if (holdcount > 0) | |
1045 | return; | |
1046 | ||
1047 | #ifdef HAVE_SIGSET | |
1048 | sigrelse(SIGTERM); | |
1049 | sigrelse(SIGCHLD); | |
1050 | #elif defined(HAVE_SIGACTION) | |
1051 | sigprocmask(SIG_SETMASK, &holdmask, NULL); | |
1052 | #endif /* HAVE_SIGSET */ | |
1053 | } | |
1054 | ||
1055 | ||
1056 | /* | |
1057 | * 'cupsdSetString()' - Set a string value. | |
1058 | */ | |
1059 | ||
1060 | void | |
1061 | cupsdSetString(char **s, /* O - New string */ | |
1062 | const char *v) /* I - String value */ | |
1063 | { | |
1064 | if (!s || *s == v) | |
1065 | return; | |
1066 | ||
1067 | if (*s) | |
1068 | free(*s); | |
1069 | ||
1070 | if (v) | |
1071 | *s = strdup(v); | |
1072 | else | |
1073 | *s = NULL; | |
1074 | } | |
1075 | ||
1076 | ||
1077 | /* | |
1078 | * 'cupsdSetStringf()' - Set a formatted string value. | |
1079 | */ | |
1080 | ||
1081 | void | |
1082 | cupsdSetStringf(char **s, /* O - New string */ | |
1083 | const char *f, /* I - Printf-style format string */ | |
1084 | ...) /* I - Additional args as needed */ | |
1085 | { | |
1086 | char v[4096]; /* Formatting string value */ | |
1087 | va_list ap; /* Argument pointer */ | |
1088 | char *olds; /* Old string */ | |
1089 | ||
1090 | ||
1091 | if (!s) | |
1092 | return; | |
1093 | ||
1094 | olds = *s; | |
1095 | ||
1096 | if (f) | |
1097 | { | |
1098 | va_start(ap, f); | |
1099 | vsnprintf(v, sizeof(v), f, ap); | |
1100 | va_end(ap); | |
1101 | ||
1102 | *s = strdup(v); | |
1103 | } | |
1104 | else | |
1105 | *s = NULL; | |
1106 | ||
1107 | if (olds) | |
1108 | free(olds); | |
1109 | } | |
1110 | ||
1111 | ||
1112 | /* | |
1113 | * 'parent_handler()' - Catch USR1/CHLD signals... | |
1114 | */ | |
1115 | ||
1116 | static void | |
1117 | parent_handler(int sig) /* I - Signal */ | |
1118 | { | |
1119 | /* | |
1120 | * Store the signal we got from the OS and return... | |
1121 | */ | |
1122 | ||
1123 | parent_signal = sig; | |
1124 | } | |
1125 | ||
1126 | ||
1127 | /* | |
1128 | * 'process_children()' - Process all dead children... | |
1129 | */ | |
1130 | ||
1131 | static void | |
1132 | process_children(void) | |
1133 | { | |
1134 | int status; /* Exit status of child */ | |
1135 | int pid; /* Process ID of child */ | |
1136 | cupsd_job_t *job; /* Current job */ | |
1137 | int i; /* Looping var */ | |
1138 | ||
1139 | ||
1140 | cupsdLogMessage(CUPSD_LOG_DEBUG2, "process_children()"); | |
1141 | ||
1142 | /* | |
1143 | * Reset the dead_children flag... | |
1144 | */ | |
1145 | ||
1146 | dead_children = 0; | |
1147 | ||
1148 | /* | |
1149 | * Collect the exit status of some children... | |
1150 | */ | |
1151 | ||
1152 | #ifdef HAVE_WAITPID | |
1153 | while ((pid = waitpid(-1, &status, WNOHANG)) > 0) | |
1154 | #elif defined(HAVE_WAIT3) | |
1155 | while ((pid = wait3(&status, WNOHANG, NULL)) > 0) | |
1156 | #else | |
1157 | if ((pid = wait(&status)) > 0) | |
1158 | #endif /* HAVE_WAITPID */ | |
1159 | { | |
1160 | cupsdLogMessage(CUPSD_LOG_DEBUG2, | |
1161 | "process_children: pid = %d, status = %d\n", pid, status); | |
1162 | ||
1163 | /* | |
1164 | * Ignore SIGTERM errors - that comes when a job is cancelled... | |
1165 | */ | |
1166 | ||
1167 | if (status == SIGTERM) | |
1168 | status = 0; | |
1169 | ||
1170 | if (status) | |
1171 | { | |
1172 | if (WIFEXITED(status)) | |
1173 | cupsdLogMessage(CUPSD_LOG_ERROR, "PID %d stopped with status %d!", pid, | |
1174 | WEXITSTATUS(status)); | |
1175 | else | |
1176 | cupsdLogMessage(CUPSD_LOG_ERROR, "PID %d crashed on signal %d!", pid, | |
1177 | WTERMSIG(status)); | |
1178 | ||
1179 | if (LogLevel < CUPSD_LOG_DEBUG) | |
1180 | cupsdLogMessage(CUPSD_LOG_INFO, | |
1181 | "Hint: Try setting the LogLevel to \"debug\" to find out more."); | |
1182 | } | |
1183 | else | |
1184 | cupsdLogMessage(CUPSD_LOG_DEBUG2, "PID %d exited with no errors.", pid); | |
1185 | ||
1186 | /* | |
1187 | * Delete certificates for CGI processes... | |
1188 | */ | |
1189 | ||
1190 | if (pid) | |
1191 | cupsdDeleteCert(pid); | |
1192 | ||
1193 | /* | |
1194 | * Lookup the PID in the jobs list... | |
1195 | */ | |
1196 | ||
1197 | for (job = (cupsd_job_t *)cupsArrayFirst(ActiveJobs); | |
1198 | job; | |
1199 | job = (cupsd_job_t *)cupsArrayNext(ActiveJobs)) | |
1200 | if (job->state != NULL && | |
1201 | job->state->values[0].integer == IPP_JOB_PROCESSING) | |
1202 | { | |
1203 | for (i = 0; job->filters[i]; i ++) | |
1204 | if (job->filters[i] == pid) | |
1205 | break; | |
1206 | ||
1207 | if (job->filters[i] || job->backend == pid) | |
1208 | { | |
1209 | /* | |
1210 | * OK, this process has gone away; what's left? | |
1211 | */ | |
1212 | ||
1213 | if (job->filters[i]) | |
1214 | job->filters[i] = -pid; | |
1215 | else | |
1216 | job->backend = -pid; | |
1217 | ||
1218 | if (status && job->status >= 0) | |
1219 | { | |
1220 | /* | |
1221 | * An error occurred; save the exit status so we know to stop | |
1222 | * the printer or cancel the job when all of the filters finish... | |
1223 | * | |
1224 | * A negative status indicates that the backend failed and the | |
1225 | * printer needs to be stopped. | |
1226 | */ | |
1227 | ||
1228 | if (job->filters[i]) | |
1229 | job->status = status; /* Filter failed */ | |
1230 | else | |
1231 | job->status = -status; /* Backend failed */ | |
1232 | } | |
1233 | ||
1234 | /* | |
1235 | * If this is not the last file in a job, see if all of the | |
1236 | * filters are done, and if so move to the next file. | |
1237 | */ | |
1238 | ||
1239 | if (job->current_file < job->num_files) | |
1240 | { | |
1241 | for (i = 0; job->filters[i] < 0; i ++); | |
1242 | ||
1243 | if (!job->filters[i]) | |
1244 | { | |
1245 | /* | |
1246 | * Process the next file... | |
1247 | */ | |
1248 | ||
1249 | cupsdFinishJob(job); | |
1250 | } | |
1251 | } | |
1252 | break; | |
1253 | } | |
1254 | } | |
1255 | } | |
1256 | } | |
1257 | ||
1258 | ||
1259 | /* | |
1260 | * 'sigchld_handler()' - Handle 'child' signals from old processes. | |
1261 | */ | |
1262 | ||
1263 | static void | |
1264 | sigchld_handler(int sig) /* I - Signal number */ | |
1265 | { | |
1266 | (void)sig; | |
1267 | ||
1268 | /* | |
1269 | * Flag that we have dead children... | |
1270 | */ | |
1271 | ||
1272 | dead_children = 1; | |
1273 | ||
1274 | /* | |
1275 | * Reset the signal handler as needed... | |
1276 | */ | |
1277 | ||
1278 | #if !defined(HAVE_SIGSET) && !defined(HAVE_SIGACTION) | |
1279 | signal(SIGCLD, sigchld_handler); | |
1280 | #endif /* !HAVE_SIGSET && !HAVE_SIGACTION */ | |
1281 | } | |
1282 | ||
1283 | ||
1284 | /* | |
1285 | * 'sighup_handler()' - Handle 'hangup' signals to reconfigure the scheduler. | |
1286 | */ | |
1287 | ||
1288 | static void | |
1289 | sighup_handler(int sig) /* I - Signal number */ | |
1290 | { | |
1291 | (void)sig; | |
1292 | ||
1293 | NeedReload = RELOAD_ALL; | |
1294 | ReloadTime = time(NULL); | |
1295 | ||
1296 | #if !defined(HAVE_SIGSET) && !defined(HAVE_SIGACTION) | |
1297 | signal(SIGHUP, sighup_handler); | |
1298 | #endif /* !HAVE_SIGSET && !HAVE_SIGACTION */ | |
1299 | } | |
1300 | ||
1301 | ||
1302 | /* | |
1303 | * 'sigterm_handler()' - Handle 'terminate' signals that stop the scheduler. | |
1304 | */ | |
1305 | ||
1306 | static void | |
1307 | sigterm_handler(int sig) /* I - Signal */ | |
1308 | { | |
1309 | (void)sig; /* remove compiler warnings... */ | |
1310 | ||
1311 | /* | |
1312 | * Flag that we should stop and return... | |
1313 | */ | |
1314 | ||
1315 | stop_scheduler = 1; | |
1316 | } | |
1317 | ||
1318 | ||
1319 | /* | |
1320 | * 'select_timeout()' - Calculate the select timeout value. | |
1321 | * | |
1322 | */ | |
1323 | ||
1324 | static long /* O - Number of seconds */ | |
1325 | select_timeout(int fds) /* I - Number of ready descriptors select returned */ | |
1326 | { | |
1327 | int i; /* Looping var */ | |
1328 | long timeout; /* Timeout for select */ | |
1329 | time_t now; /* Current time */ | |
1330 | cupsd_client_t *con; /* Client information */ | |
1331 | cupsd_printer_t *p; /* Printer information */ | |
1332 | cupsd_job_t *job; /* Job information */ | |
1333 | cupsd_subscription_t *sub; /* Subscription information */ | |
1334 | const char *why; /* Debugging aid */ | |
1335 | ||
1336 | ||
1337 | /* | |
1338 | * Check to see if any of the clients have pending data to be | |
1339 | * processed; if so, the timeout should be 0... | |
1340 | */ | |
1341 | ||
1342 | for (i = NumClients, con = Clients; i > 0; i --, con ++) | |
1343 | if (con->http.used > 0) | |
1344 | return (0); | |
1345 | ||
1346 | /* | |
1347 | * If select has been active in the last second (fds != 0) or we have | |
1348 | * many resources in use then don't bother trying to optimize the | |
1349 | * timeout, just make it 1 second. | |
1350 | */ | |
1351 | ||
1352 | if (fds || NumClients > 50) | |
1353 | return (1); | |
1354 | ||
1355 | /* | |
1356 | * Otherwise, check all of the possible events that we need to wake for... | |
1357 | */ | |
1358 | ||
1359 | now = time(NULL); | |
1360 | timeout = now + 86400; /* 86400 == 1 day */ | |
1361 | why = "do nothing"; | |
1362 | ||
1363 | /* | |
1364 | * Check the activity and close old clients... | |
1365 | */ | |
1366 | ||
1367 | for (i = NumClients, con = Clients; i > 0; i --, con ++) | |
1368 | if ((con->http.activity + Timeout) < timeout) | |
1369 | { | |
1370 | timeout = con->http.activity + Timeout; | |
1371 | why = "timeout a client connection"; | |
1372 | } | |
1373 | ||
1374 | /* | |
1375 | * Update the browse list as needed... | |
1376 | */ | |
1377 | ||
1378 | if (Browsing && BrowseLocalProtocols) | |
1379 | { | |
1380 | #ifdef HAVE_LIBSLP | |
1381 | if ((BrowseLocalProtocols & BROWSE_SLP) && (BrowseSLPRefresh < timeout)) | |
1382 | { | |
1383 | timeout = BrowseSLPRefresh; | |
1384 | why = "update SLP browsing"; | |
1385 | } | |
1386 | #endif /* HAVE_LIBSLP */ | |
1387 | ||
1388 | if (BrowseLocalProtocols & BROWSE_CUPS) | |
1389 | { | |
1390 | for (p = (cupsd_printer_t *)cupsArrayFirst(Printers); | |
1391 | p; | |
1392 | p = (cupsd_printer_t *)cupsArrayNext(Printers)) | |
1393 | { | |
1394 | if (p->type & CUPS_PRINTER_REMOTE) | |
1395 | { | |
1396 | if ((p->browse_time + BrowseTimeout) < timeout) | |
1397 | { | |
1398 | timeout = p->browse_time + BrowseTimeout; | |
1399 | why = "browse timeout a printer"; | |
1400 | } | |
1401 | } | |
1402 | else if (!(p->type & CUPS_PRINTER_IMPLICIT)) | |
1403 | { | |
1404 | if (BrowseInterval && (p->browse_time + BrowseInterval) < timeout) | |
1405 | { | |
1406 | timeout = p->browse_time + BrowseInterval; | |
1407 | why = "send browse update"; | |
1408 | } | |
1409 | } | |
1410 | } | |
1411 | } | |
1412 | } | |
1413 | ||
1414 | /* | |
1415 | * Check for any active jobs... | |
1416 | */ | |
1417 | ||
1418 | if (timeout > (now + 10) && ActiveJobs) | |
1419 | { | |
1420 | for (job = (cupsd_job_t *)cupsArrayFirst(ActiveJobs); | |
1421 | job; | |
1422 | job = (cupsd_job_t *)cupsArrayNext(ActiveJobs)) | |
1423 | if (job->state->values[0].integer <= IPP_JOB_PROCESSING) | |
1424 | { | |
1425 | timeout = now + 10; | |
1426 | why = "process active jobs"; | |
1427 | break; | |
1428 | } | |
1429 | } | |
1430 | ||
1431 | #ifdef HAVE_MALLINFO | |
1432 | /* | |
1433 | * Log memory usage every minute... | |
1434 | */ | |
1435 | ||
1436 | if (LogLevel >= CUPSD_LOG_DEBUG && (mallinfo_time + 60) < timeout) | |
1437 | { | |
1438 | timeout = mallinfo_time + 60; | |
1439 | why = "display memory usage"; | |
1440 | } | |
1441 | #endif /* HAVE_MALLINFO */ | |
1442 | ||
1443 | /* | |
1444 | * Update the root certificate when needed... | |
1445 | */ | |
1446 | ||
1447 | if (!RunUser && RootCertDuration && | |
1448 | (RootCertTime + RootCertDuration) < timeout) | |
1449 | { | |
1450 | timeout = RootCertTime + RootCertDuration; | |
1451 | why = "update root certificate"; | |
1452 | } | |
1453 | ||
1454 | /* | |
1455 | * Expire subscriptions as needed... | |
1456 | */ | |
1457 | ||
1458 | for (sub = (cupsd_subscription_t *)cupsArrayFirst(Subscriptions); | |
1459 | sub; | |
1460 | sub = (cupsd_subscription_t *)cupsArrayNext(Subscriptions)) | |
1461 | if (!sub->job && sub->expire < timeout) | |
1462 | { | |
1463 | timeout = sub->expire; | |
1464 | why = "expire subscription"; | |
1465 | } | |
1466 | ||
1467 | /* | |
1468 | * Adjust from absolute to relative time. If p->browse_time above | |
1469 | * was 0 then we can end up with a negative value here, so check. | |
1470 | * We add 1 second to the timeout since events occur after the | |
1471 | * timeout expires, and limit the timeout to 86400 seconds (1 day) | |
1472 | * to avoid select() timeout limits present on some operating | |
1473 | * systems... | |
1474 | */ | |
1475 | ||
1476 | timeout = timeout - now + 1; | |
1477 | ||
1478 | if (timeout < 1) | |
1479 | timeout = 1; | |
1480 | else if (timeout > 86400) | |
1481 | timeout = 86400; | |
1482 | ||
1483 | /* | |
1484 | * Log and return the timeout value... | |
1485 | */ | |
1486 | ||
1487 | cupsdLogMessage(CUPSD_LOG_DEBUG2, "select_timeout: %ld seconds to %s", | |
1488 | timeout, why); | |
1489 | ||
1490 | return (timeout); | |
1491 | } | |
1492 | ||
1493 | ||
1494 | /* | |
1495 | * 'usage()' - Show scheduler usage. | |
1496 | */ | |
1497 | ||
1498 | static void | |
1499 | usage(void) | |
1500 | { | |
1501 | fputs("Usage: cupsd [-c config-file] [-f] [-F]\n", stderr); | |
1502 | exit(1); | |
1503 | } | |
1504 | ||
1505 | ||
1506 | /* | |
1507 | * End of "$Id: main.c 4838 2005-11-14 18:34:27Z mike $". | |
1508 | */ |