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1.1 misho 1:
2: /*
3: * Copyright (C) Igor Sysoev
4: * Copyright (C) Nginx, Inc.
5: */
6:
7:
8: #include <ngx_config.h>
9: #include <ngx_core.h>
10: #include <ngx_event.h>
11:
12:
13: #if (NGX_TEST_BUILD_RTSIG)
14:
15: #if (NGX_DARWIN)
16:
17: #define SIGRTMIN 33
18: #define si_fd __pad[0]
19:
20: #else
21:
22: #ifdef SIGRTMIN
23: #define si_fd _reason.__spare__.__spare2__[0]
24: #else
25: #define SIGRTMIN 33
26: #define si_fd __spare__[0]
27: #endif
28:
29: #endif
30:
31: #define F_SETSIG 10
32: #define KERN_RTSIGNR 30
33: #define KERN_RTSIGMAX 31
34:
35: int sigtimedwait(const sigset_t *set, siginfo_t *info,
36: const struct timespec *timeout);
37:
38: int sigtimedwait(const sigset_t *set, siginfo_t *info,
39: const struct timespec *timeout)
40: {
41: return -1;
42: }
43:
44: int ngx_linux_rtsig_max;
45:
46: #endif
47:
48:
49: typedef struct {
50: ngx_uint_t signo;
51: ngx_uint_t overflow_events;
52: ngx_uint_t overflow_test;
53: ngx_uint_t overflow_threshold;
54: } ngx_rtsig_conf_t;
55:
56:
57: extern ngx_event_module_t ngx_poll_module_ctx;
58:
59: static ngx_int_t ngx_rtsig_init(ngx_cycle_t *cycle, ngx_msec_t timer);
60: static void ngx_rtsig_done(ngx_cycle_t *cycle);
61: static ngx_int_t ngx_rtsig_add_connection(ngx_connection_t *c);
62: static ngx_int_t ngx_rtsig_del_connection(ngx_connection_t *c,
63: ngx_uint_t flags);
64: static ngx_int_t ngx_rtsig_process_events(ngx_cycle_t *cycle,
65: ngx_msec_t timer, ngx_uint_t flags);
66: static ngx_int_t ngx_rtsig_process_overflow(ngx_cycle_t *cycle,
67: ngx_msec_t timer, ngx_uint_t flags);
68:
69: static void *ngx_rtsig_create_conf(ngx_cycle_t *cycle);
70: static char *ngx_rtsig_init_conf(ngx_cycle_t *cycle, void *conf);
71: static char *ngx_check_ngx_overflow_threshold_bounds(ngx_conf_t *cf,
72: void *post, void *data);
73:
74:
75: static sigset_t set;
76: static ngx_uint_t overflow, overflow_current;
77: static struct pollfd *overflow_list;
78:
79:
80: static ngx_str_t rtsig_name = ngx_string("rtsig");
81:
82: static ngx_conf_num_bounds_t ngx_overflow_threshold_bounds = {
83: ngx_check_ngx_overflow_threshold_bounds, 2, 10
84: };
85:
86:
87: static ngx_command_t ngx_rtsig_commands[] = {
88:
89: { ngx_string("rtsig_signo"),
90: NGX_EVENT_CONF|NGX_CONF_TAKE1,
91: ngx_conf_set_num_slot,
92: 0,
93: offsetof(ngx_rtsig_conf_t, signo),
94: NULL },
95:
96: { ngx_string("rtsig_overflow_events"),
97: NGX_EVENT_CONF|NGX_CONF_TAKE1,
98: ngx_conf_set_num_slot,
99: 0,
100: offsetof(ngx_rtsig_conf_t, overflow_events),
101: NULL },
102:
103: { ngx_string("rtsig_overflow_test"),
104: NGX_EVENT_CONF|NGX_CONF_TAKE1,
105: ngx_conf_set_num_slot,
106: 0,
107: offsetof(ngx_rtsig_conf_t, overflow_test),
108: NULL },
109:
110: { ngx_string("rtsig_overflow_threshold"),
111: NGX_EVENT_CONF|NGX_CONF_TAKE1,
112: ngx_conf_set_num_slot,
113: 0,
114: offsetof(ngx_rtsig_conf_t, overflow_threshold),
115: &ngx_overflow_threshold_bounds },
116:
117: ngx_null_command
118: };
119:
120:
121: ngx_event_module_t ngx_rtsig_module_ctx = {
122: &rtsig_name,
123: ngx_rtsig_create_conf, /* create configuration */
124: ngx_rtsig_init_conf, /* init configuration */
125:
126: {
127: NULL, /* add an event */
128: NULL, /* delete an event */
129: NULL, /* enable an event */
130: NULL, /* disable an event */
131: ngx_rtsig_add_connection, /* add an connection */
132: ngx_rtsig_del_connection, /* delete an connection */
133: NULL, /* process the changes */
134: ngx_rtsig_process_events, /* process the events */
135: ngx_rtsig_init, /* init the events */
136: ngx_rtsig_done, /* done the events */
137: }
138:
139: };
140:
141: ngx_module_t ngx_rtsig_module = {
142: NGX_MODULE_V1,
143: &ngx_rtsig_module_ctx, /* module context */
144: ngx_rtsig_commands, /* module directives */
145: NGX_EVENT_MODULE, /* module type */
146: NULL, /* init master */
147: NULL, /* init module */
148: NULL, /* init process */
149: NULL, /* init thread */
150: NULL, /* exit thread */
151: NULL, /* exit process */
152: NULL, /* exit master */
153: NGX_MODULE_V1_PADDING
154: };
155:
156:
157: static ngx_int_t
158: ngx_rtsig_init(ngx_cycle_t *cycle, ngx_msec_t timer)
159: {
160: ngx_rtsig_conf_t *rtscf;
161:
162: rtscf = ngx_event_get_conf(cycle->conf_ctx, ngx_rtsig_module);
163:
164: sigemptyset(&set);
165: sigaddset(&set, (int) rtscf->signo);
166: sigaddset(&set, (int) rtscf->signo + 1);
167: sigaddset(&set, SIGIO);
168: sigaddset(&set, SIGALRM);
169:
170: if (sigprocmask(SIG_BLOCK, &set, NULL) == -1) {
171: ngx_log_error(NGX_LOG_EMERG, cycle->log, ngx_errno,
172: "sigprocmask() failed");
173: return NGX_ERROR;
174: }
175:
176: if (overflow_list) {
177: ngx_free(overflow_list);
178: }
179:
180: overflow_list = ngx_alloc(sizeof(struct pollfd) * rtscf->overflow_events,
181: cycle->log);
182: if (overflow_list == NULL) {
183: return NGX_ERROR;
184: }
185:
186: ngx_io = ngx_os_io;
187:
188: ngx_event_actions = ngx_rtsig_module_ctx.actions;
189:
190: ngx_event_flags = NGX_USE_RTSIG_EVENT
191: |NGX_USE_GREEDY_EVENT
192: |NGX_USE_FD_EVENT;
193:
194: return NGX_OK;
195: }
196:
197:
198: static void
199: ngx_rtsig_done(ngx_cycle_t *cycle)
200: {
201: ngx_free(overflow_list);
202:
203: overflow_list = NULL;
204: }
205:
206:
207: static ngx_int_t
208: ngx_rtsig_add_connection(ngx_connection_t *c)
209: {
210: ngx_uint_t signo;
211: ngx_rtsig_conf_t *rtscf;
212:
213: if (c->read->accept && c->read->disabled) {
214:
215: ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, 0,
216: "rtsig enable connection: fd:%d", c->fd);
217:
218: if (fcntl(c->fd, F_SETOWN, ngx_pid) == -1) {
219: ngx_log_error(NGX_LOG_ALERT, c->log, ngx_errno,
220: "fcntl(F_SETOWN) failed");
221: return NGX_ERROR;
222: }
223:
224: c->read->active = 1;
225: c->read->disabled = 0;
226: }
227:
228: rtscf = ngx_event_get_conf(ngx_cycle->conf_ctx, ngx_rtsig_module);
229:
230: signo = rtscf->signo + c->read->instance;
231:
232: ngx_log_debug2(NGX_LOG_DEBUG_EVENT, c->log, 0,
233: "rtsig add connection: fd:%d signo:%ui", c->fd, signo);
234:
235: if (fcntl(c->fd, F_SETFL, O_RDWR|O_NONBLOCK|O_ASYNC) == -1) {
236: ngx_log_error(NGX_LOG_ALERT, c->log, ngx_errno,
237: "fcntl(O_RDWR|O_NONBLOCK|O_ASYNC) failed");
238: return NGX_ERROR;
239: }
240:
241: if (fcntl(c->fd, F_SETSIG, (int) signo) == -1) {
242: ngx_log_error(NGX_LOG_ALERT, c->log, ngx_errno,
243: "fcntl(F_SETSIG) failed");
244: return NGX_ERROR;
245: }
246:
247: if (fcntl(c->fd, F_SETOWN, ngx_pid) == -1) {
248: ngx_log_error(NGX_LOG_ALERT, c->log, ngx_errno,
249: "fcntl(F_SETOWN) failed");
250: return NGX_ERROR;
251: }
252:
253: #if (NGX_HAVE_ONESIGFD)
254: if (fcntl(c->fd, F_SETAUXFL, O_ONESIGFD) == -1) {
255: ngx_log_error(NGX_LOG_ALERT, c->log, ngx_errno,
256: "fcntl(F_SETAUXFL) failed");
257: return NGX_ERROR;
258: }
259: #endif
260:
261: c->read->active = 1;
262: c->write->active = 1;
263:
264: return NGX_OK;
265: }
266:
267:
268: static ngx_int_t
269: ngx_rtsig_del_connection(ngx_connection_t *c, ngx_uint_t flags)
270: {
271: ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, 0,
272: "rtsig del connection: fd:%d", c->fd);
273:
274: if ((flags & NGX_DISABLE_EVENT) && c->read->accept) {
275:
276: ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, 0,
277: "rtsig disable connection: fd:%d", c->fd);
278:
279: c->read->active = 0;
280: c->read->disabled = 1;
281: return NGX_OK;
282: }
283:
284: if (flags & NGX_CLOSE_EVENT) {
285: c->read->active = 0;
286: c->write->active = 0;
287: return NGX_OK;
288: }
289:
290: if (fcntl(c->fd, F_SETFL, O_RDWR|O_NONBLOCK) == -1) {
291: ngx_log_error(NGX_LOG_ALERT, c->log, ngx_errno,
292: "fcntl(O_RDWR|O_NONBLOCK) failed");
293: return NGX_ERROR;
294: }
295:
296: c->read->active = 0;
297: c->write->active = 0;
298:
299: return NGX_OK;
300: }
301:
302:
303: static ngx_int_t
304: ngx_rtsig_process_events(ngx_cycle_t *cycle, ngx_msec_t timer, ngx_uint_t flags)
305: {
306: int signo;
307: ngx_int_t instance;
308: ngx_err_t err;
309: siginfo_t si;
310: ngx_event_t *rev, *wev, **queue;
311: struct timespec ts, *tp;
312: struct sigaction sa;
313: ngx_connection_t *c;
314: ngx_rtsig_conf_t *rtscf;
315:
316: if (timer == NGX_TIMER_INFINITE) {
317: tp = NULL;
318:
319: } else {
320: ts.tv_sec = timer / 1000;
321: ts.tv_nsec = (timer % 1000) * 1000000;
322: tp = &ts;
323: }
324:
325: ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
326: "rtsig timer: %M", timer);
327:
328: /* Linux's sigwaitinfo() is sigtimedwait() with the NULL timeout pointer */
329:
330: signo = sigtimedwait(&set, &si, tp);
331:
332: if (signo == -1) {
333: err = ngx_errno;
334:
335: ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, err,
336: "rtsig signo:%d", signo);
337:
338: if (flags & NGX_UPDATE_TIME) {
339: ngx_time_update();
340: }
341:
342: if (err == NGX_EAGAIN) {
343:
344: /* timeout */
345:
346: if (timer != NGX_TIMER_INFINITE) {
347: return NGX_AGAIN;
348: }
349:
350: ngx_log_error(NGX_LOG_ALERT, cycle->log, err,
351: "sigtimedwait() returned EAGAIN without timeout");
352: return NGX_ERROR;
353: }
354:
355: ngx_log_error((err == NGX_EINTR) ? NGX_LOG_INFO : NGX_LOG_ALERT,
356: cycle->log, err, "sigtimedwait() failed");
357: return NGX_ERROR;
358: }
359:
360: ngx_log_debug3(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
361: "rtsig signo:%d fd:%d band:%04Xd",
362: signo, si.si_fd, si.si_band);
363:
364: if (flags & NGX_UPDATE_TIME) {
365: ngx_time_update();
366: }
367:
368: rtscf = ngx_event_get_conf(ngx_cycle->conf_ctx, ngx_rtsig_module);
369:
370: if (signo == (int) rtscf->signo || signo == (int) rtscf->signo + 1) {
371:
372: if (overflow && (ngx_uint_t) si.si_fd > overflow_current) {
373: return NGX_OK;
374: }
375:
376: c = ngx_cycle->files[si.si_fd];
377:
378: if (c == NULL) {
379:
380: /* the stale event */
381:
382: return NGX_OK;
383: }
384:
385: instance = signo - (int) rtscf->signo;
386:
387: rev = c->read;
388:
389: if (rev->instance != instance) {
390:
391: /*
392: * the stale event from a file descriptor
393: * that was just closed in this iteration
394: */
395:
396: ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
397: "rtsig: stale event %p", c);
398:
399: return NGX_OK;
400: }
401:
402: if ((si.si_band & (POLLIN|POLLHUP|POLLERR)) && rev->active) {
403:
404: rev->ready = 1;
405:
406: if (flags & NGX_POST_EVENTS) {
407: queue = (ngx_event_t **) (rev->accept ?
408: &ngx_posted_accept_events : &ngx_posted_events);
409:
410: ngx_locked_post_event(rev, queue);
411:
412: } else {
413: rev->handler(rev);
414: }
415: }
416:
417: wev = c->write;
418:
419: if ((si.si_band & (POLLOUT|POLLHUP|POLLERR)) && wev->active) {
420:
421: wev->ready = 1;
422:
423: if (flags & NGX_POST_EVENTS) {
424: ngx_locked_post_event(wev, &ngx_posted_events);
425:
426: } else {
427: wev->handler(wev);
428: }
429: }
430:
431: return NGX_OK;
432:
433: } else if (signo == SIGALRM) {
434:
435: ngx_time_update();
436:
437: return NGX_OK;
438:
439: } else if (signo == SIGIO) {
440:
441: ngx_log_error(NGX_LOG_ALERT, cycle->log, 0,
442: "rt signal queue overflowed");
443:
444: /* flush the RT signal queue */
445:
446: ngx_memzero(&sa, sizeof(struct sigaction));
447: sa.sa_handler = SIG_DFL;
448: sigemptyset(&sa.sa_mask);
449:
450: if (sigaction(rtscf->signo, &sa, NULL) == -1) {
451: ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
452: "sigaction(%d, SIG_DFL) failed", rtscf->signo);
453: }
454:
455: if (sigaction(rtscf->signo + 1, &sa, NULL) == -1) {
456: ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
457: "sigaction(%d, SIG_DFL) failed", rtscf->signo + 1);
458: }
459:
460: overflow = 1;
461: overflow_current = 0;
462: ngx_event_actions.process_events = ngx_rtsig_process_overflow;
463:
464: return NGX_ERROR;
465:
466: }
467:
468: ngx_log_error(NGX_LOG_ALERT, cycle->log, 0,
469: "sigtimedwait() returned unexpected signal: %d", signo);
470:
471: return NGX_ERROR;
472: }
473:
474:
475: static ngx_int_t
476: ngx_rtsig_process_overflow(ngx_cycle_t *cycle, ngx_msec_t timer,
477: ngx_uint_t flags)
478: {
479: int name[2], rtsig_max, rtsig_nr, events, ready;
480: size_t len;
481: ngx_err_t err;
482: ngx_uint_t tested, n, i;
483: ngx_event_t *rev, *wev, **queue;
484: ngx_connection_t *c;
485: ngx_rtsig_conf_t *rtscf;
486:
487: ngx_log_debug0(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
488: "rtsig process overflow");
489:
490: rtscf = ngx_event_get_conf(ngx_cycle->conf_ctx, ngx_rtsig_module);
491:
492: tested = 0;
493:
494: for ( ;; ) {
495:
496: n = 0;
497: while (n < rtscf->overflow_events) {
498:
499: if (overflow_current == cycle->connection_n) {
500: break;
501: }
502:
503: c = cycle->files[overflow_current++];
504:
505: if (c == NULL || c->fd == -1) {
506: continue;
507: }
508:
509: events = 0;
510:
511: if (c->read->active && c->read->handler) {
512: events |= POLLIN;
513: }
514:
515: if (c->write->active && c->write->handler) {
516: events |= POLLOUT;
517: }
518:
519: if (events == 0) {
520: continue;
521: }
522:
523: overflow_list[n].fd = c->fd;
524: overflow_list[n].events = events;
525: overflow_list[n].revents = 0;
526: n++;
527: }
528:
529: if (n == 0) {
530: break;
531: }
532:
533: for ( ;; ) {
534: ready = poll(overflow_list, n, 0);
535:
536: ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
537: "rtsig overflow poll:%d", ready);
538:
539: if (ready == -1) {
540: err = ngx_errno;
541: ngx_log_error((err == NGX_EINTR) ? NGX_LOG_INFO : NGX_LOG_ALERT,
542: cycle->log, 0,
543: "poll() failed while the overflow recover");
544:
545: if (err == NGX_EINTR) {
546: continue;
547: }
548: }
549:
550: break;
551: }
552:
553: if (ready <= 0) {
554: continue;
555: }
556:
557: ngx_mutex_lock(ngx_posted_events_mutex);
558:
559: for (i = 0; i < n; i++) {
560: c = cycle->files[overflow_list[i].fd];
561:
562: if (c == NULL) {
563: continue;
564: }
565:
566: rev = c->read;
567:
568: if (rev->active
569: && !rev->closed
570: && rev->handler
571: && (overflow_list[i].revents
572: & (POLLIN|POLLERR|POLLHUP|POLLNVAL)))
573: {
574: tested++;
575:
576: if ((flags & NGX_POST_THREAD_EVENTS) && !rev->accept) {
577: rev->posted_ready = 1;
578:
579: } else {
580: rev->ready = 1;
581: }
582:
583: if (flags & NGX_POST_EVENTS) {
584: queue = (ngx_event_t **) (rev->accept ?
585: &ngx_posted_accept_events : &ngx_posted_events);
586:
587: ngx_locked_post_event(rev, queue);
588:
589: } else {
590: rev->handler(rev);
591: }
592: }
593:
594: wev = c->write;
595:
596: if (wev->active
597: && !wev->closed
598: && wev->handler
599: && (overflow_list[i].revents
600: & (POLLOUT|POLLERR|POLLHUP|POLLNVAL)))
601: {
602: tested++;
603:
604: if (flags & NGX_POST_THREAD_EVENTS) {
605: wev->posted_ready = 1;
606:
607: } else {
608: wev->ready = 1;
609: }
610:
611: if (flags & NGX_POST_EVENTS) {
612: ngx_locked_post_event(wev, &ngx_posted_events);
613:
614: } else {
615: wev->handler(wev);
616: }
617: }
618: }
619:
620: ngx_mutex_unlock(ngx_posted_events_mutex);
621:
622: if (tested >= rtscf->overflow_test) {
623:
624: if (ngx_linux_rtsig_max) {
625:
626: /*
627: * Check the current rt queue length to prevent
628: * the new overflow.
629: *
630: * learn the "/proc/sys/kernel/rtsig-max" value because
631: * it can be changed since the last checking
632: */
633:
634: name[0] = CTL_KERN;
635: name[1] = KERN_RTSIGMAX;
636: len = sizeof(rtsig_max);
637:
638: if (sysctl(name, 2, &rtsig_max, &len, NULL, 0) == -1) {
639: ngx_log_error(NGX_LOG_ALERT, cycle->log, errno,
640: "sysctl(KERN_RTSIGMAX) failed");
641: return NGX_ERROR;
642: }
643:
644: /* name[0] = CTL_KERN; */
645: name[1] = KERN_RTSIGNR;
646: len = sizeof(rtsig_nr);
647:
648: if (sysctl(name, 2, &rtsig_nr, &len, NULL, 0) == -1) {
649: ngx_log_error(NGX_LOG_ALERT, cycle->log, errno,
650: "sysctl(KERN_RTSIGNR) failed");
651: return NGX_ERROR;
652: }
653:
654: /*
655: * drain the rt signal queue if the /"proc/sys/kernel/rtsig-nr"
656: * is bigger than
657: * "/proc/sys/kernel/rtsig-max" / "rtsig_overflow_threshold"
658: */
659:
660: if (rtsig_max / (int) rtscf->overflow_threshold < rtsig_nr) {
661: ngx_log_debug2(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
662: "rtsig queue state: %d/%d",
663: rtsig_nr, rtsig_max);
664: while (ngx_rtsig_process_events(cycle, 0, flags) == NGX_OK)
665: {
666: /* void */
667: }
668: }
669:
670: } else {
671:
672: /*
673: * Linux has not KERN_RTSIGMAX since 2.6.6-mm2
674: * so drain the rt signal queue unconditionally
675: */
676:
677: while (ngx_rtsig_process_events(cycle, 0, flags) == NGX_OK) {
678: /* void */
679: }
680: }
681:
682: tested = 0;
683: }
684: }
685:
686: if (flags & NGX_UPDATE_TIME) {
687: ngx_time_update();
688: }
689:
690: ngx_log_error(NGX_LOG_ALERT, cycle->log, 0,
691: "rt signal queue overflow recovered");
692:
693: overflow = 0;
694: ngx_event_actions.process_events = ngx_rtsig_process_events;
695:
696: return NGX_OK;
697: }
698:
699:
700: static void *
701: ngx_rtsig_create_conf(ngx_cycle_t *cycle)
702: {
703: ngx_rtsig_conf_t *rtscf;
704:
705: rtscf = ngx_palloc(cycle->pool, sizeof(ngx_rtsig_conf_t));
706: if (rtscf == NULL) {
707: return NULL;
708: }
709:
710: rtscf->signo = NGX_CONF_UNSET;
711: rtscf->overflow_events = NGX_CONF_UNSET;
712: rtscf->overflow_test = NGX_CONF_UNSET;
713: rtscf->overflow_threshold = NGX_CONF_UNSET;
714:
715: return rtscf;
716: }
717:
718:
719: static char *
720: ngx_rtsig_init_conf(ngx_cycle_t *cycle, void *conf)
721: {
722: ngx_rtsig_conf_t *rtscf = conf;
723:
724: /* LinuxThreads use the first 3 RT signals */
725: ngx_conf_init_uint_value(rtscf->signo, SIGRTMIN + 10);
726:
727: ngx_conf_init_uint_value(rtscf->overflow_events, 16);
728: ngx_conf_init_uint_value(rtscf->overflow_test, 32);
729: ngx_conf_init_uint_value(rtscf->overflow_threshold, 10);
730:
731: return NGX_CONF_OK;
732: }
733:
734:
735: static char *
736: ngx_check_ngx_overflow_threshold_bounds(ngx_conf_t *cf, void *post, void *data)
737: {
738: if (ngx_linux_rtsig_max) {
739: return ngx_conf_check_num_bounds(cf, post, data);
740: }
741:
742: ngx_conf_log_error(NGX_LOG_WARN, cf, 0,
743: "\"rtsig_overflow_threshold\" is not supported "
744: "since Linux 2.6.6-mm2, ignored");
745:
746: return NGX_CONF_OK;
747: }