1
2 /*
3 * Copyright (C) Igor Sysoev
4 */
5
6
7 #include <ngx_config.h>
8 #include <ngx_core.h>
9 #include <ngx_event.h>
10 #include <ngx_event_pipe.h>
11
12
13 static ngx_int_t ngx_event_pipe_read_upstream(ngx_event_pipe_t *p);
14 static ngx_int_t ngx_event_pipe_write_to_downstream(ngx_event_pipe_t *p);
15
16 static ngx_int_t ngx_event_pipe_write_chain_to_temp_file(ngx_event_pipe_t *p);
17 static ngx_inline void ngx_event_pipe_remove_shadow_links(ngx_buf_t *buf);
18 static ngx_inline void ngx_event_pipe_free_shadow_raw_buf(ngx_chain_t **free,
19 ngx_buf_t *buf);
20 static ngx_int_t ngx_event_pipe_drain_chains(ngx_event_pipe_t *p);
21
22
23 ngx_int_t
24 ngx_event_pipe(ngx_event_pipe_t *p, ngx_int_t do_write)
25 {
26 u_int flags;
27 ngx_event_t *rev, *wev;
28
29 for ( ;; ) {
30 if (do_write) {
31 p->log->action = "sending to client";
32
33 if (ngx_event_pipe_write_to_downstream(p) == NGX_ABORT) {
34 return NGX_ABORT;
35 }
36 }
37
38 p->read = 0;
39 p->upstream_blocked = 0;
40
41 p->log->action = "reading upstream";
42
43 if (ngx_event_pipe_read_upstream(p) == NGX_ABORT) {
44 return NGX_ABORT;
45 }
46
47 if (!p->read && !p->upstream_blocked) {
48 break;
49 }
50
51 do_write = 1;
52 }
53
54 if (p->upstream->fd != -1) {
55 rev = p->upstream->read;
56
57 flags = (rev->eof || rev->error) ? NGX_CLOSE_EVENT : 0;
58
59 if (ngx_handle_read_event(rev, flags) == NGX_ERROR) {
60 return NGX_ABORT;
61 }
62
63 if (rev->active && !rev->ready) {
64 ngx_add_timer(rev, p->read_timeout);
65
66 } else if (rev->timer_set) {
67 ngx_del_timer(rev);
68 }
69 }
70
71 if (p->downstream->fd != -1 && p->downstream->data == p->output_ctx) {
72 wev = p->downstream->write;
73 if (ngx_handle_write_event(wev, p->send_lowat) == NGX_ERROR) {
74 return NGX_ABORT;
75 }
76
77 if (!wev->delayed) {
78 if (wev->active && !wev->ready) {
79 ngx_add_timer(wev, p->send_timeout);
80
81 } else if (wev->timer_set) {
82 ngx_del_timer(wev);
83 }
84 }
85 }
86
87 return NGX_OK;
88 }
89
90
91 static ngx_int_t
92 ngx_event_pipe_read_upstream(ngx_event_pipe_t *p)
93 {
94 ssize_t n, size;
95 ngx_int_t rc;
96 ngx_buf_t *b;
97 ngx_chain_t *chain, *cl, *ln;
98
99 if (p->upstream_eof || p->upstream_error || p->upstream_done) {
100 return NGX_OK;
101 }
102
103 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, p->log, 0,
104 "pipe read upstream: %d", p->upstream->read->ready);
105
106 for ( ;; ) {
107
108 if (p->upstream_eof || p->upstream_error || p->upstream_done) {
109 break;
110 }
111
112 if (p->preread_bufs == NULL && !p->upstream->read->ready) {
113 break;
114 }
115
116 if (p->preread_bufs) {
117
118 /* use the pre-read bufs if they exist */
119
120 chain = p->preread_bufs;
121 p->preread_bufs = NULL;
122 n = p->preread_size;
123
124 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, p->log, 0,
125 "pipe preread: %z", n);
126
127 if (n) {
128 p->read = 1;
129 }
130
131 } else {
132
133 #if (NGX_HAVE_KQUEUE)
134
135 /*
136 * kqueue notifies about the end of file or a pending error.
137 * This test allows not to allocate a buf on these conditions
138 * and not to call c->recv_chain().
139 */
140
141 if (p->upstream->read->available == 0
142 && p->upstream->read->pending_eof)
143 {
144 p->upstream->read->ready = 0;
145 p->upstream->read->eof = 0;
146 p->upstream_eof = 1;
147 p->read = 1;
148
149 if (p->upstream->read->kq_errno) {
150 p->upstream->read->error = 1;
151 p->upstream_error = 1;
152 p->upstream_eof = 0;
153
154 ngx_log_error(NGX_LOG_ERR, p->log,
155 p->upstream->read->kq_errno,
156 "kevent() reported that upstream "
157 "closed connection");
158 }
159
160 break;
161 }
162 #endif
163
164 if (p->free_raw_bufs) {
165
166 /* use the free bufs if they exist */
167
168 chain = p->free_raw_bufs;
169 if (p->single_buf) {
170 p->free_raw_bufs = p->free_raw_bufs->next;
171 chain->next = NULL;
172 } else {
173 p->free_raw_bufs = NULL;
174 }
175
176 } else if (p->allocated < p->bufs.num) {
177
178 /* allocate a new buf if it's still allowed */
179
180 b = ngx_create_temp_buf(p->pool, p->bufs.size);
181 if (b == NULL) {
182 return NGX_ABORT;
183 }
184
185 p->allocated++;
186
187 chain = ngx_alloc_chain_link(p->pool);
188 if (chain == NULL) {
189 return NGX_ABORT;
190 }
191
192 chain->buf = b;
193 chain->next = NULL;
194
195 } else if (!p->cacheable
196 && p->downstream->data == p->output_ctx
197 && p->downstream->write->ready
198 && !p->downstream->write->delayed)
199 {
200 /*
201 * if the bufs are not needed to be saved in a cache and
202 * a downstream is ready then write the bufs to a downstream
203 */
204
205 p->upstream_blocked = 1;
206
207 ngx_log_debug0(NGX_LOG_DEBUG_EVENT, p->log, 0,
208 "pipe downstream ready");
209
210 break;
211
212 } else if (p->cacheable
213 || p->temp_file->offset < p->max_temp_file_size)
214 {
215
216 /*
217 * if it is allowed, then save some bufs from r->in
218 * to a temporary file, and add them to a r->out chain
219 */
220
221 rc = ngx_event_pipe_write_chain_to_temp_file(p);
222
223 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, p->log, 0,
224 "pipe temp offset: %O", p->temp_file->offset);
225
226 if (rc == NGX_BUSY) {
227 break;
228 }
229
230 if (rc == NGX_AGAIN) {
231 if (ngx_event_flags & NGX_USE_LEVEL_EVENT
232 && p->upstream->read->active
233 && p->upstream->read->ready)
234 {
235 if (ngx_del_event(p->upstream->read, NGX_READ_EVENT, 0)
236 == NGX_ERROR)
237 {
238 return NGX_ABORT;
239 }
240 }
241 }
242
243 if (rc != NGX_OK) {
244 return rc;
245 }
246
247 chain = p->free_raw_bufs;
248 if (p->single_buf) {
249 p->free_raw_bufs = p->free_raw_bufs->next;
250 chain->next = NULL;
251 } else {
252 p->free_raw_bufs = NULL;
253 }
254
255 } else {
256
257 /* there are no bufs to read in */
258
259 ngx_log_debug0(NGX_LOG_DEBUG_EVENT, p->log, 0,
260 "no pipe bufs to read in");
261
262 break;
263 }
264
265 n = p->upstream->recv_chain(p->upstream, chain);
266
267 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, p->log, 0,
268 "pipe recv chain: %z", n);
269
270 if (p->free_raw_bufs) {
271 chain->next = p->free_raw_bufs;
272 }
273 p->free_raw_bufs = chain;
274
275 if (n == NGX_ERROR) {
276 p->upstream_error = 1;
277 return NGX_ERROR;
278 }
279
280 if (n == NGX_AGAIN) {
281 if (p->single_buf) {
282 ngx_event_pipe_remove_shadow_links(chain->buf);
283 }
284
285 break;
286 }
287
288 p->read = 1;
289
290 if (n == 0) {
291 p->upstream_eof = 1;
292 break;
293 }
294 }
295
296 p->read_length += n;
297 cl = chain;
298 p->free_raw_bufs = NULL;
299
300 while (cl && n > 0) {
301
302 ngx_event_pipe_remove_shadow_links(cl->buf);
303
304 size = cl->buf->end - cl->buf->last;
305
306 if (n >= size) {
307 cl->buf->last = cl->buf->end;
308
309 /* STUB */ cl->buf->num = p->num++;
310
311 if (p->input_filter(p, cl->buf) == NGX_ERROR) {
312 return NGX_ABORT;
313 }
314
315 n -= size;
316 ln = cl;
317 cl = cl->next;
318 ngx_free_chain(p->pool, ln);
319
320 } else {
321 cl->buf->last += n;
322 n = 0;
323 }
324 }
325
326 if (cl) {
327 for (ln = cl; ln->next; ln = ln->next) { /* void */ }
328
329 ln->next = p->free_raw_bufs;
330 p->free_raw_bufs = cl;
331 }
332 }
333
334 #if (NGX_DEBUG)
335
336 for (cl = p->busy; cl; cl = cl->next) {
337 ngx_log_debug8(NGX_LOG_DEBUG_EVENT, p->log, 0,
338 "pipe buf busy s:%d t:%d f:%d "
339 "%p, pos %p, size: %z "
340 "file: %O, size: %z",
341 (cl->buf->shadow ? 1 : 0),
342 cl->buf->temporary, cl->buf->in_file,
343 cl->buf->start, cl->buf->pos,
344 cl->buf->last - cl->buf->pos,
345 cl->buf->file_pos,
346 cl->buf->file_last - cl->buf->file_pos);
347 }
348
349 for (cl = p->out; cl; cl = cl->next) {
350 ngx_log_debug8(NGX_LOG_DEBUG_EVENT, p->log, 0,
351 "pipe buf out s:%d t:%d f:%d "
352 "%p, pos %p, size: %z "
353 "file: %O, size: %z",
354 (cl->buf->shadow ? 1 : 0),
355 cl->buf->temporary, cl->buf->in_file,
356 cl->buf->start, cl->buf->pos,
357 cl->buf->last - cl->buf->pos,
358 cl->buf->file_pos,
359 cl->buf->file_last - cl->buf->file_pos);
360 }
361
362 for (cl = p->in; cl; cl = cl->next) {
363 ngx_log_debug8(NGX_LOG_DEBUG_EVENT, p->log, 0,
364 "pipe buf in s:%d t:%d f:%d "
365 "%p, pos %p, size: %z "
366 "file: %O, size: %z",
367 (cl->buf->shadow ? 1 : 0),
368 cl->buf->temporary, cl->buf->in_file,
369 cl->buf->start, cl->buf->pos,
370 cl->buf->last - cl->buf->pos,
371 cl->buf->file_pos,
372 cl->buf->file_last - cl->buf->file_pos);
373 }
374
375 for (cl = p->free_raw_bufs; cl; cl = cl->next) {
376 ngx_log_debug8(NGX_LOG_DEBUG_EVENT, p->log, 0,
377 "pipe buf free s:%d t:%d f:%d "
378 "%p, pos %p, size: %z "
379 "file: %O, size: %z",
380 (cl->buf->shadow ? 1 : 0),
381 cl->buf->temporary, cl->buf->in_file,
382 cl->buf->start, cl->buf->pos,
383 cl->buf->last - cl->buf->pos,
384 cl->buf->file_pos,
385 cl->buf->file_last - cl->buf->file_pos);
386 }
387
388 #endif
389
390 if ((p->upstream_eof || p->upstream_error) && p->free_raw_bufs) {
391
392 /* STUB */ p->free_raw_bufs->buf->num = p->num++;
393
394 if (p->input_filter(p, p->free_raw_bufs->buf) == NGX_ERROR) {
395 return NGX_ABORT;
396 }
397
398 p->free_raw_bufs = p->free_raw_bufs->next;
399
400 if (p->free_bufs) {
401 for (cl = p->free_raw_bufs; cl; cl = cl->next) {
402 if (cl->buf->shadow == NULL) {
403 ngx_pfree(p->pool, cl->buf->start);
404 }
405 }
406 }
407 }
408
409 if (p->cacheable && p->in) {
410 if (ngx_event_pipe_write_chain_to_temp_file(p) == NGX_ABORT) {
411 return NGX_ABORT;
412 }
413 }
414
415 return NGX_OK;
416 }
417
418
419 static ngx_int_t
420 ngx_event_pipe_write_to_downstream(ngx_event_pipe_t *p)
421 {
422 u_char *prev;
423 size_t bsize;
424 ngx_int_t rc;
425 ngx_uint_t flush, prev_last_shadow;
426 ngx_chain_t *out, **ll, *cl;
427 ngx_connection_t *downstream;
428
429 downstream = p->downstream;
430
431 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, p->log, 0,
432 "pipe write downstream: %d", downstream->write->ready);
433
434 for ( ;; ) {
435 if (p->downstream_error) {
436 return ngx_event_pipe_drain_chains(p);
437 }
438
439 if (p->upstream_eof || p->upstream_error || p->upstream_done) {
440
441 /* pass the p->out and p->in chains to the output filter */
442
443 for (cl = p->busy; cl; cl = cl->next) {
444 cl->buf->recycled = 0;
445 }
446
447 if (p->out) {
448 ngx_log_debug0(NGX_LOG_DEBUG_EVENT, p->log, 0,
449 "pipe write downstream flush out");
450
451 for (cl = p->out; cl; cl = cl->next) {
452 cl->buf->recycled = 0;
453 }
454
455 rc = p->output_filter(p->output_ctx, p->out);
456
457 if (downstream->destroyed) {
458 return NGX_ABORT;
459 }
460
461 if (rc == NGX_ERROR) {
462 p->downstream_error = 1;
463 return ngx_event_pipe_drain_chains(p);
464 }
465
466 p->out = NULL;
467 }
468
469 if (p->in) {
470 ngx_log_debug0(NGX_LOG_DEBUG_EVENT, p->log, 0,
471 "pipe write downstream flush in");
472
473 for (cl = p->in; cl; cl = cl->next) {
474 cl->buf->recycled = 0;
475 }
476
477 rc = p->output_filter(p->output_ctx, p->in);
478
479 if (downstream->destroyed) {
480 return NGX_ABORT;
481 }
482
483 if (rc == NGX_ERROR) {
484 p->downstream_error = 1;
485 return ngx_event_pipe_drain_chains(p);
486 }
487
488 p->in = NULL;
489 }
490
491 ngx_log_debug0(NGX_LOG_DEBUG_EVENT, p->log, 0,
492 "pipe write downstream done");
493
494 /* TODO: free unused bufs */
495
496 p->downstream_done = 1;
497 break;
498 }
499
500 if (downstream->data != p->output_ctx
501 || !downstream->write->ready
502 || downstream->write->delayed)
503 {
504 break;
505 }
506
507 /* bsize is the size of the busy recycled bufs */
508
509 prev = NULL;
510 bsize = 0;
511
512 for (cl = p->busy; cl; cl = cl->next) {
513
514 if (cl->buf->recycled) {
515 if (prev == cl->buf->start) {
516 continue;
517 }
518
519 bsize += cl->buf->end - cl->buf->start;
520 prev = cl->buf->start;
521 }
522 }
523
524 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, p->log, 0,
525 "pipe write busy: %uz", bsize);
526
527 out = NULL;
528
529 if (bsize >= (size_t) p->busy_size) {
530 flush = 1;
531 goto flush;
532 }
533
534 flush = 0;
535 ll = NULL;
536 prev_last_shadow = 1;
537
538 for ( ;; ) {
539 if (p->out) {
540 cl = p->out;
541
542 if (cl->buf->recycled
543 && bsize + cl->buf->last - cl->buf->pos > p->busy_size)
544 {
545 flush = 1;
546 break;
547 }
548
549 p->out = p->out->next;
550
551 ngx_event_pipe_free_shadow_raw_buf(&p->free_raw_bufs, cl->buf);
552
553 } else if (!p->cacheable && p->in) {
554 cl = p->in;
555
556 ngx_log_debug3(NGX_LOG_DEBUG_EVENT, p->log, 0,
557 "pipe write buf ls:%d %p %z",
558 cl->buf->last_shadow,
559 cl->buf->pos,
560 cl->buf->last - cl->buf->pos);
561
562 if (cl->buf->recycled
563 && cl->buf->last_shadow
564 && bsize + cl->buf->last - cl->buf->pos > p->busy_size)
565 {
566 if (!prev_last_shadow) {
567 p->in = p->in->next;
568
569 cl->next = NULL;
570
571 if (out) {
572 *ll = cl;
573 } else {
574 out = cl;
575 }
576 }
577
578 flush = 1;
579 break;
580 }
581
582 prev_last_shadow = cl->buf->last_shadow;
583
584 p->in = p->in->next;
585
586 } else {
587 break;
588 }
589
590 if (cl->buf->recycled) {
591 bsize += cl->buf->last - cl->buf->pos;
592 }
593
594 cl->next = NULL;
595
596 if (out) {
597 *ll = cl;
598 } else {
599 out = cl;
600 }
601 ll = &cl->next;
602 }
603
604 flush:
605
606 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, p->log, 0,
607 "pipe write: out:%p, f:%d", out, flush);
608
609 if (out == NULL && !flush) {
610 break;
611 }
612
613 rc = p->output_filter(p->output_ctx, out);
614
615 if (downstream->destroyed) {
616 return NGX_ABORT;
617 }
618
619 if (rc == NGX_ERROR) {
620 p->downstream_error = 1;
621 return ngx_event_pipe_drain_chains(p);
622 }
623
624 ngx_chain_update_chains(&p->free, &p->busy, &out, p->tag);
625
626 for (cl = p->free; cl; cl = cl->next) {
627
628 if (cl->buf->temp_file) {
629 if (p->cacheable || !p->cyclic_temp_file) {
630 continue;
631 }
632
633 /* reset p->temp_offset if all bufs had been sent */
634
635 if (cl->buf->file_last == p->temp_file->offset) {
636 p->temp_file->offset = 0;
637 }
638 }
639
640 /* TODO: free buf if p->free_bufs && upstream done */
641
642 /* add the free shadow raw buf to p->free_raw_bufs */
643
644 if (cl->buf->last_shadow) {
645 if (ngx_event_pipe_add_free_buf(p, cl->buf->shadow) != NGX_OK) {
646 return NGX_ABORT;
647 }
648
649 cl->buf->last_shadow = 0;
650 }
651
652 cl->buf->shadow = NULL;
653 }
654 }
655
656 return NGX_OK;
657 }
658
659
660 static ngx_int_t
661 ngx_event_pipe_write_chain_to_temp_file(ngx_event_pipe_t *p)
662 {
663 ssize_t size, bsize;
664 ngx_buf_t *b;
665 ngx_chain_t *cl, *tl, *next, *out, **ll, **last_free, fl;
666
667 if (p->buf_to_file) {
668 fl.buf = p->buf_to_file;
669 fl.next = p->in;
670 out = &fl;
671
672 } else {
673 out = p->in;
674 }
675
676 if (!p->cacheable) {
677
678 size = 0;
679 cl = out;
680 ll = NULL;
681
682 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, p->log, 0,
683 "pipe offset: %O", p->temp_file->offset);
684
685 do {
686 bsize = cl->buf->last - cl->buf->pos;
687
688 ngx_log_debug3(NGX_LOG_DEBUG_EVENT, p->log, 0,
689 "pipe buf %p, pos %p, size: %z",
690 cl->buf->start, cl->buf->pos, bsize);
691
692 if ((size + bsize > p->temp_file_write_size)
693 || (p->temp_file->offset + size + bsize > p->max_temp_file_size))
694 {
695 break;
696 }
697
698 size += bsize;
699 ll = &cl->next;
700 cl = cl->next;
701
702 } while (cl);
703
704 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, p->log, 0, "size: %z", size);
705
706 if (ll == NULL) {
707 return NGX_BUSY;
708 }
709
710 if (cl) {
711 p->in = cl;
712 *ll = NULL;
713
714 } else {
715 p->in = NULL;
716 p->last_in = &p->in;
717 }
718
719 } else {
720 p->in = NULL;
721 p->last_in = &p->in;
722 }
723
724 if (ngx_write_chain_to_temp_file(p->temp_file, out) == NGX_ERROR) {
725 return NGX_ABORT;
726 }
727
728 for (last_free = &p->free_raw_bufs;
729 *last_free != NULL;
730 last_free = &(*last_free)->next)
731 {
732 /* void */
733 }
734
735 if (p->buf_to_file) {
736 p->temp_file->offset = p->buf_to_file->last - p->buf_to_file->pos;
737 p->buf_to_file = NULL;
738 out = out->next;
739 }
740
741 for (cl = out; cl; cl = next) {
742 next = cl->next;
743 cl->next = NULL;
744
745 b = cl->buf;
746 b->file = &p->temp_file->file;
747 b->file_pos = p->temp_file->offset;
748 p->temp_file->offset += b->last - b->pos;
749 b->file_last = p->temp_file->offset;
750
751 b->in_file = 1;
752 b->temp_file = 1;
753
754 if (p->out) {
755 *p->last_out = cl;
756 } else {
757 p->out = cl;
758 }
759 p->last_out = &cl->next;
760
761 if (b->last_shadow) {
762
763 tl = ngx_alloc_chain_link(p->pool);
764 if (tl == NULL) {
765 return NGX_ABORT;
766 }
767
768 tl->buf = b->shadow;
769 tl->next = NULL;
770
771 *last_free = tl;
772 last_free = &tl->next;
773
774 b->shadow->pos = b->shadow->start;
775 b->shadow->last = b->shadow->start;
776
777 ngx_event_pipe_remove_shadow_links(b->shadow);
778 }
779 }
780
781 return NGX_OK;
782 }
783
784
785 /* the copy input filter */
786
787 ngx_int_t
788 ngx_event_pipe_copy_input_filter(ngx_event_pipe_t *p, ngx_buf_t *buf)
789 {
790 ngx_buf_t *b;
791 ngx_chain_t *cl;
792
793 if (buf->pos == buf->last) {
794 return NGX_OK;
795 }
796
797 if (p->free) {
798 cl = p->free;
799 b = cl->buf;
800 p->free = cl->next;
801 ngx_free_chain(p->pool, cl);
802
803 } else {
804 b = ngx_alloc_buf(p->pool);
805 if (b == NULL) {
806 return NGX_ERROR;
807 }
808 }
809
810 ngx_memcpy(b, buf, sizeof(ngx_buf_t));
811 b->shadow = buf;
812 b->tag = p->tag;
813 b->last_shadow = 1;
814 b->recycled = 1;
815 buf->shadow = b;
816
817 cl = ngx_alloc_chain_link(p->pool);
818 if (cl == NULL) {
819 return NGX_ERROR;
820 }
821
822 cl->buf = b;
823 cl->next = NULL;
824
825 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, p->log, 0, "input buf #%d", b->num);
826
827 if (p->in) {
828 *p->last_in = cl;
829 } else {
830 p->in = cl;
831 }
832 p->last_in = &cl->next;
833
834 return NGX_OK;
835 }
836
837
838 static ngx_inline void
839 ngx_event_pipe_remove_shadow_links(ngx_buf_t *buf)
840 {
841 ngx_buf_t *b, *next;
842
843 b = buf->shadow;
844
845 if (b == NULL) {
846 return;
847 }
848
849 while (!b->last_shadow) {
850 next = b->shadow;
851
852 b->temporary = 0;
853 b->recycled = 0;
854
855 b->shadow = NULL;
856 b = next;
857 }
858
859 b->temporary = 0;
860 b->recycled = 0;
861 b->last_shadow = 0;
862
863 b->shadow = NULL;
864
865 buf->shadow = NULL;
866 }
867
868
869 static ngx_inline void
870 ngx_event_pipe_free_shadow_raw_buf(ngx_chain_t **free, ngx_buf_t *buf)
871 {
872 ngx_buf_t *s;
873 ngx_chain_t *cl, **ll;
874
875 if (buf->shadow == NULL) {
876 return;
877 }
878
879 for (s = buf->shadow; !s->last_shadow; s = s->shadow) { /* void */ }
880
881 ll = free;
882
883 for (cl = *free ; cl; cl = cl->next) {
884 if (cl->buf == s) {
885 *ll = cl->next;
886 break;
887 }
888
889 if (cl->buf->shadow) {
890 break;
891 }
892
893 ll = &cl->next;
894 }
895 }
896
897
898 ngx_int_t
899 ngx_event_pipe_add_free_buf(ngx_event_pipe_t *p, ngx_buf_t *b)
900 {
901 ngx_chain_t *cl;
902
903 cl = ngx_alloc_chain_link(p->pool);
904 if (cl == NULL) {
905 return NGX_ERROR;
906 }
907
908 b->pos = b->start;
909 b->last = b->start;
910 b->shadow = NULL;
911
912 cl->buf = b;
913
914 if (p->free_raw_bufs == NULL) {
915 p->free_raw_bufs = cl;
916 cl->next = NULL;
917
918 return NGX_OK;
919 }
920
921 if (p->free_raw_bufs->buf->pos == p->free_raw_bufs->buf->last) {
922
923 /* add the free buf to the list start */
924
925 cl->next = p->free_raw_bufs;
926 p->free_raw_bufs = cl;
927
928 return NGX_OK;
929 }
930
931 /* the first free buf is partialy filled, thus add the free buf after it */
932
933 cl->next = p->free_raw_bufs->next;
934 p->free_raw_bufs->next = cl;
935
936 return NGX_OK;
937 }
938
939
940 static ngx_int_t
941 ngx_event_pipe_drain_chains(ngx_event_pipe_t *p)
942 {
943 ngx_chain_t *cl, *tl;
944
945 for ( ;; ) {
946 if (p->busy) {
947 cl = p->busy;
948 p->busy = NULL;
949
950 } else if (p->out) {
951 cl = p->out;
952 p->out = NULL;
953
954 } else if (p->in) {
955 cl = p->in;
956 p->in = NULL;
957
958 } else {
959 return NGX_OK;
960 }
961
962 while (cl) {
963 if (cl->buf->last_shadow) {
964 if (ngx_event_pipe_add_free_buf(p, cl->buf->shadow) != NGX_OK) {
965 return NGX_ABORT;
966 }
967
968 cl->buf->last_shadow = 0;
969 }
970
971 cl->buf->shadow = NULL;
972 tl = cl->next;
973 cl->next = p->free;
974 p->free = cl;
975 cl = tl;
976 }
977 }
978 }
979
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