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Update and clean Tomato RAF files
[tomato.git] / release / src / router / nginx / src / event / ngx_event_pipe.c
blob476d56e30e3881e278c53ada3147adcba4e22b4f
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 #include <ngx_event_pipe.h>
12
13
14 static ngx_int_t ngx_event_pipe_read_upstream(ngx_event_pipe_t *p);
15 static ngx_int_t ngx_event_pipe_write_to_downstream(ngx_event_pipe_t *p);
16
17 static ngx_int_t ngx_event_pipe_write_chain_to_temp_file(ngx_event_pipe_t *p);
18 static ngx_inline void ngx_event_pipe_remove_shadow_links(ngx_buf_t *buf);
19 static ngx_int_t ngx_event_pipe_drain_chains(ngx_event_pipe_t *p);
20
21
22 ngx_int_t
23 ngx_event_pipe(ngx_event_pipe_t *p, ngx_int_t do_write)
24 {
25 u_int flags;
26 ngx_int_t rc;
27 ngx_event_t *rev, *wev;
28
29 for ( ;; ) {
30 if (do_write) {
31 p->log->action = "sending to client";
32
33 rc = ngx_event_pipe_write_to_downstream(p);
34
35 if (rc == NGX_ABORT) {
36 return NGX_ABORT;
37 }
38
39 if (rc == NGX_BUSY) {
40 return NGX_OK;
41 }
42 }
43
44 p->read = 0;
45 p->upstream_blocked = 0;
46
47 p->log->action = "reading upstream";
48
49 if (ngx_event_pipe_read_upstream(p) == NGX_ABORT) {
50 return NGX_ABORT;
51 }
52
53 if (!p->read && !p->upstream_blocked) {
54 break;
55 }
56
57 do_write = 1;
58 }
59
60 if (p->upstream->fd != -1) {
61 rev = p->upstream->read;
62
63 flags = (rev->eof || rev->error) ? NGX_CLOSE_EVENT : 0;
64
65 if (ngx_handle_read_event(rev, flags) != NGX_OK) {
66 return NGX_ABORT;
67 }
68
69 if (rev->active && !rev->ready) {
70 ngx_add_timer(rev, p->read_timeout);
71
72 } else if (rev->timer_set) {
73 ngx_del_timer(rev);
74 }
75 }
76
77 if (p->downstream->fd != -1 && p->downstream->data == p->output_ctx) {
78 wev = p->downstream->write;
79 if (ngx_handle_write_event(wev, p->send_lowat) != NGX_OK) {
80 return NGX_ABORT;
81 }
82
83 if (!wev->delayed) {
84 if (wev->active && !wev->ready) {
85 ngx_add_timer(wev, p->send_timeout);
86
87 } else if (wev->timer_set) {
88 ngx_del_timer(wev);
89 }
90 }
91 }
92
93 return NGX_OK;
94 }
95
96
97 static ngx_int_t
98 ngx_event_pipe_read_upstream(ngx_event_pipe_t *p)
99 {
100 ssize_t n, size;
101 ngx_int_t rc;
102 ngx_buf_t *b;
103 ngx_chain_t *chain, *cl, *ln;
104
105 if (p->upstream_eof || p->upstream_error || p->upstream_done) {
106 return NGX_OK;
107 }
108
109 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, p->log, 0,
110 "pipe read upstream: %d", p->upstream->read->ready);
111
112 for ( ;; ) {
113
114 if (p->upstream_eof || p->upstream_error || p->upstream_done) {
115 break;
116 }
117
118 if (p->preread_bufs == NULL && !p->upstream->read->ready) {
119 break;
120 }
121
122 if (p->preread_bufs) {
123
124 /* use the pre-read bufs if they exist */
125
126 chain = p->preread_bufs;
127 p->preread_bufs = NULL;
128 n = p->preread_size;
129
130 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, p->log, 0,
131 "pipe preread: %z", n);
132
133 if (n) {
134 p->read = 1;
135 }
136
137 } else {
138
139 #if (NGX_HAVE_KQUEUE)
140
141 /*
142 * kqueue notifies about the end of file or a pending error.
143 * This test allows not to allocate a buf on these conditions
144 * and not to call c->recv_chain().
145 */
146
147 if (p->upstream->read->available == 0
148 && p->upstream->read->pending_eof)
149 {
150 p->upstream->read->ready = 0;
151 p->upstream->read->eof = 1;
152 p->upstream_eof = 1;
153 p->read = 1;
154
155 if (p->upstream->read->kq_errno) {
156 p->upstream->read->error = 1;
157 p->upstream_error = 1;
158 p->upstream_eof = 0;
159
160 ngx_log_error(NGX_LOG_ERR, p->log,
161 p->upstream->read->kq_errno,
162 "kevent() reported that upstream "
163 "closed connection");
164 }
165
166 break;
167 }
168 #endif
169
170 if (p->free_raw_bufs) {
171
172 /* use the free bufs if they exist */
173
174 chain = p->free_raw_bufs;
175 if (p->single_buf) {
176 p->free_raw_bufs = p->free_raw_bufs->next;
177 chain->next = NULL;
178 } else {
179 p->free_raw_bufs = NULL;
180 }
181
182 } else if (p->allocated < p->bufs.num) {
183
184 /* allocate a new buf if it's still allowed */
185
186 b = ngx_create_temp_buf(p->pool, p->bufs.size);
187 if (b == NULL) {
188 return NGX_ABORT;
189 }
190
191 p->allocated++;
192
193 chain = ngx_alloc_chain_link(p->pool);
194 if (chain == NULL) {
195 return NGX_ABORT;
196 }
197
198 chain->buf = b;
199 chain->next = NULL;
200
201 } else if (!p->cacheable
202 && p->downstream->data == p->output_ctx
203 && p->downstream->write->ready
204 && !p->downstream->write->delayed)
205 {
206 /*
207 * if the bufs are not needed to be saved in a cache and
208 * a downstream is ready then write the bufs to a downstream
209 */
210
211 p->upstream_blocked = 1;
212
213 ngx_log_debug0(NGX_LOG_DEBUG_EVENT, p->log, 0,
214 "pipe downstream ready");
215
216 break;
217
218 } else if (p->cacheable
219 || p->temp_file->offset < p->max_temp_file_size)
220 {
221
222 /*
223 * if it is allowed, then save some bufs from r->in
224 * to a temporary file, and add them to a r->out chain
225 */
226
227 rc = ngx_event_pipe_write_chain_to_temp_file(p);
228
229 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, p->log, 0,
230 "pipe temp offset: %O", p->temp_file->offset);
231
232 if (rc == NGX_BUSY) {
233 break;
234 }
235
236 if (rc == NGX_AGAIN) {
237 if (ngx_event_flags & NGX_USE_LEVEL_EVENT
238 && p->upstream->read->active
239 && p->upstream->read->ready)
240 {
241 if (ngx_del_event(p->upstream->read, NGX_READ_EVENT, 0)
242 == NGX_ERROR)
243 {
244 return NGX_ABORT;
245 }
246 }
247 }
248
249 if (rc != NGX_OK) {
250 return rc;
251 }
252
253 chain = p->free_raw_bufs;
254 if (p->single_buf) {
255 p->free_raw_bufs = p->free_raw_bufs->next;
256 chain->next = NULL;
257 } else {
258 p->free_raw_bufs = NULL;
259 }
260
261 } else {
262
263 /* there are no bufs to read in */
264
265 ngx_log_debug0(NGX_LOG_DEBUG_EVENT, p->log, 0,
266 "no pipe bufs to read in");
267
268 break;
269 }
270
271 n = p->upstream->recv_chain(p->upstream, chain);
272
273 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, p->log, 0,
274 "pipe recv chain: %z", n);
275
276 if (p->free_raw_bufs) {
277 chain->next = p->free_raw_bufs;
278 }
279 p->free_raw_bufs = chain;
280
281 if (n == NGX_ERROR) {
282 p->upstream_error = 1;
283 return NGX_ERROR;
284 }
285
286 if (n == NGX_AGAIN) {
287 if (p->single_buf) {
288 ngx_event_pipe_remove_shadow_links(chain->buf);
289 }
290
291 break;
292 }
293
294 p->read = 1;
295
296 if (n == 0) {
297 p->upstream_eof = 1;
298 break;
299 }
300 }
301
302 p->read_length += n;
303 cl = chain;
304 p->free_raw_bufs = NULL;
305
306 while (cl && n > 0) {
307
308 ngx_event_pipe_remove_shadow_links(cl->buf);
309
310 size = cl->buf->end - cl->buf->last;
311
312 if (n >= size) {
313 cl->buf->last = cl->buf->end;
314
315 /* STUB */ cl->buf->num = p->num++;
316
317 if (p->input_filter(p, cl->buf) == NGX_ERROR) {
318 return NGX_ABORT;
319 }
320
321 n -= size;
322 ln = cl;
323 cl = cl->next;
324 ngx_free_chain(p->pool, ln);
325
326 } else {
327 cl->buf->last += n;
328 n = 0;
329 }
330 }
331
332 if (cl) {
333 for (ln = cl; ln->next; ln = ln->next) { /* void */ }
334
335 ln->next = p->free_raw_bufs;
336 p->free_raw_bufs = cl;
337 }
338 }
339
340 #if (NGX_DEBUG)
341
342 for (cl = p->busy; cl; cl = cl->next) {
343 ngx_log_debug8(NGX_LOG_DEBUG_EVENT, p->log, 0,
344 "pipe buf busy s:%d t:%d f:%d "
345 "%p, pos %p, size: %z "
346 "file: %O, size: %z",
347 (cl->buf->shadow ? 1 : 0),
348 cl->buf->temporary, cl->buf->in_file,
349 cl->buf->start, cl->buf->pos,
350 cl->buf->last - cl->buf->pos,
351 cl->buf->file_pos,
352 cl->buf->file_last - cl->buf->file_pos);
353 }
354
355 for (cl = p->out; cl; cl = cl->next) {
356 ngx_log_debug8(NGX_LOG_DEBUG_EVENT, p->log, 0,
357 "pipe buf out s:%d t:%d f:%d "
358 "%p, pos %p, size: %z "
359 "file: %O, size: %z",
360 (cl->buf->shadow ? 1 : 0),
361 cl->buf->temporary, cl->buf->in_file,
362 cl->buf->start, cl->buf->pos,
363 cl->buf->last - cl->buf->pos,
364 cl->buf->file_pos,
365 cl->buf->file_last - cl->buf->file_pos);
366 }
367
368 for (cl = p->in; cl; cl = cl->next) {
369 ngx_log_debug8(NGX_LOG_DEBUG_EVENT, p->log, 0,
370 "pipe buf in s:%d t:%d f:%d "
371 "%p, pos %p, size: %z "
372 "file: %O, size: %z",
373 (cl->buf->shadow ? 1 : 0),
374 cl->buf->temporary, cl->buf->in_file,
375 cl->buf->start, cl->buf->pos,
376 cl->buf->last - cl->buf->pos,
377 cl->buf->file_pos,
378 cl->buf->file_last - cl->buf->file_pos);
379 }
380
381 for (cl = p->free_raw_bufs; cl; cl = cl->next) {
382 ngx_log_debug8(NGX_LOG_DEBUG_EVENT, p->log, 0,
383 "pipe buf free s:%d t:%d f:%d "
384 "%p, pos %p, size: %z "
385 "file: %O, size: %z",
386 (cl->buf->shadow ? 1 : 0),
387 cl->buf->temporary, cl->buf->in_file,
388 cl->buf->start, cl->buf->pos,
389 cl->buf->last - cl->buf->pos,
390 cl->buf->file_pos,
391 cl->buf->file_last - cl->buf->file_pos);
392 }
393
394 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, p->log, 0,
395 "pipe length: %O", p->length);
396
397 #endif
398
399 if (p->free_raw_bufs && p->length != -1) {
400 cl = p->free_raw_bufs;
401
402 if (cl->buf->last - cl->buf->pos >= p->length) {
403
404 p->free_raw_bufs = cl->next;
405
406 /* STUB */ cl->buf->num = p->num++;
407
408 if (p->input_filter(p, cl->buf) == NGX_ERROR) {
409 return NGX_ABORT;
410 }
411
412 ngx_free_chain(p->pool, cl);
413 }
414 }
415
416 if (p->length == 0) {
417 p->upstream_done = 1;
418 p->read = 1;
419 }
420
421 if ((p->upstream_eof || p->upstream_error) && p->free_raw_bufs) {
422
423 /* STUB */ p->free_raw_bufs->buf->num = p->num++;
424
425 if (p->input_filter(p, p->free_raw_bufs->buf) == NGX_ERROR) {
426 return NGX_ABORT;
427 }
428
429 p->free_raw_bufs = p->free_raw_bufs->next;
430
431 if (p->free_bufs && p->buf_to_file == NULL) {
432 for (cl = p->free_raw_bufs; cl; cl = cl->next) {
433 if (cl->buf->shadow == NULL) {
434 ngx_pfree(p->pool, cl->buf->start);
435 }
436 }
437 }
438 }
439
440 if (p->cacheable && p->in) {
441 if (ngx_event_pipe_write_chain_to_temp_file(p) == NGX_ABORT) {
442 return NGX_ABORT;
443 }
444 }
445
446 return NGX_OK;
447 }
448
449
450 static ngx_int_t
451 ngx_event_pipe_write_to_downstream(ngx_event_pipe_t *p)
452 {
453 u_char *prev;
454 size_t bsize;
455 ngx_int_t rc;
456 ngx_uint_t flush, flushed, prev_last_shadow;
457 ngx_chain_t *out, **ll, *cl, file;
458 ngx_connection_t *downstream;
459
460 downstream = p->downstream;
461
462 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, p->log, 0,
463 "pipe write downstream: %d", downstream->write->ready);
464
465 flushed = 0;
466
467 for ( ;; ) {
468 if (p->downstream_error) {
469 return ngx_event_pipe_drain_chains(p);
470 }
471
472 if (p->upstream_eof || p->upstream_error || p->upstream_done) {
473
474 /* pass the p->out and p->in chains to the output filter */
475
476 for (cl = p->busy; cl; cl = cl->next) {
477 cl->buf->recycled = 0;
478 }
479
480 if (p->out) {
481 ngx_log_debug0(NGX_LOG_DEBUG_EVENT, p->log, 0,
482 "pipe write downstream flush out");
483
484 for (cl = p->out; cl; cl = cl->next) {
485 cl->buf->recycled = 0;
486 }
487
488 rc = p->output_filter(p->output_ctx, p->out);
489
490 if (rc == NGX_ERROR) {
491 p->downstream_error = 1;
492 return ngx_event_pipe_drain_chains(p);
493 }
494
495 p->out = NULL;
496 }
497
498 if (p->in) {
499 ngx_log_debug0(NGX_LOG_DEBUG_EVENT, p->log, 0,
500 "pipe write downstream flush in");
501
502 for (cl = p->in; cl; cl = cl->next) {
503 cl->buf->recycled = 0;
504 }
505
506 rc = p->output_filter(p->output_ctx, p->in);
507
508 if (rc == NGX_ERROR) {
509 p->downstream_error = 1;
510 return ngx_event_pipe_drain_chains(p);
511 }
512
513 p->in = NULL;
514 }
515
516 if (p->cacheable && p->buf_to_file) {
517
518 file.buf = p->buf_to_file;
519 file.next = NULL;
520
521 if (ngx_write_chain_to_temp_file(p->temp_file, &file)
522 == NGX_ERROR)
523 {
524 return NGX_ABORT;
525 }
526 }
527
528 ngx_log_debug0(NGX_LOG_DEBUG_EVENT, p->log, 0,
529 "pipe write downstream done");
530
531 /* TODO: free unused bufs */
532
533 p->downstream_done = 1;
534 break;
535 }
536
537 if (downstream->data != p->output_ctx
538 || !downstream->write->ready
539 || downstream->write->delayed)
540 {
541 break;
542 }
543
544 /* bsize is the size of the busy recycled bufs */
545
546 prev = NULL;
547 bsize = 0;
548
549 for (cl = p->busy; cl; cl = cl->next) {
550
551 if (cl->buf->recycled) {
552 if (prev == cl->buf->start) {
553 continue;
554 }
555
556 bsize += cl->buf->end - cl->buf->start;
557 prev = cl->buf->start;
558 }
559 }
560
561 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, p->log, 0,
562 "pipe write busy: %uz", bsize);
563
564 out = NULL;
565
566 if (bsize >= (size_t) p->busy_size) {
567 flush = 1;
568 goto flush;
569 }
570
571 flush = 0;
572 ll = NULL;
573 prev_last_shadow = 1;
574
575 for ( ;; ) {
576 if (p->out) {
577 cl = p->out;
578
579 if (cl->buf->recycled) {
580 ngx_log_error(NGX_LOG_ALERT, p->log, 0,
581 "recycled buffer in pipe out chain");
582 }
583
584 p->out = p->out->next;
585
586 } else if (!p->cacheable && p->in) {
587 cl = p->in;
588
589 ngx_log_debug3(NGX_LOG_DEBUG_EVENT, p->log, 0,
590 "pipe write buf ls:%d %p %z",
591 cl->buf->last_shadow,
592 cl->buf->pos,
593 cl->buf->last - cl->buf->pos);
594
595 if (cl->buf->recycled && prev_last_shadow) {
596 if (bsize + cl->buf->end - cl->buf->start > p->busy_size) {
597 flush = 1;
598 break;
599 }
600
601 bsize += cl->buf->end - cl->buf->start;
602 }
603
604 prev_last_shadow = cl->buf->last_shadow;
605
606 p->in = p->in->next;
607
608 } else {
609 break;
610 }
611
612 cl->next = NULL;
613
614 if (out) {
615 *ll = cl;
616 } else {
617 out = cl;
618 }
619 ll = &cl->next;
620 }
621
622 flush:
623
624 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, p->log, 0,
625 "pipe write: out:%p, f:%d", out, flush);
626
627 if (out == NULL) {
628
629 if (!flush) {
630 break;
631 }
632
633 /* a workaround for AIO */
634 if (flushed++ > 10) {
635 return NGX_BUSY;
636 }
637 }
638
639 rc = p->output_filter(p->output_ctx, out);
640
641 ngx_chain_update_chains(p->pool, &p->free, &p->busy, &out, p->tag);
642
643 if (rc == NGX_ERROR) {
644 p->downstream_error = 1;
645 return ngx_event_pipe_drain_chains(p);
646 }
647
648 for (cl = p->free; cl; cl = cl->next) {
649
650 if (cl->buf->temp_file) {
651 if (p->cacheable || !p->cyclic_temp_file) {
652 continue;
653 }
654
655 /* reset p->temp_offset if all bufs had been sent */
656
657 if (cl->buf->file_last == p->temp_file->offset) {
658 p->temp_file->offset = 0;
659 }
660 }
661
662 /* TODO: free buf if p->free_bufs && upstream done */
663
664 /* add the free shadow raw buf to p->free_raw_bufs */
665
666 if (cl->buf->last_shadow) {
667 if (ngx_event_pipe_add_free_buf(p, cl->buf->shadow) != NGX_OK) {
668 return NGX_ABORT;
669 }
670
671 cl->buf->last_shadow = 0;
672 }
673
674 cl->buf->shadow = NULL;
675 }
676 }
677
678 return NGX_OK;
679 }
680
681
682 static ngx_int_t
683 ngx_event_pipe_write_chain_to_temp_file(ngx_event_pipe_t *p)
684 {
685 ssize_t size, bsize, n;
686 ngx_buf_t *b;
687 ngx_uint_t prev_last_shadow;
688 ngx_chain_t *cl, *tl, *next, *out, **ll, **last_out, **last_free, fl;
689
690 if (p->buf_to_file) {
691 fl.buf = p->buf_to_file;
692 fl.next = p->in;
693 out = &fl;
694
695 } else {
696 out = p->in;
697 }
698
699 if (!p->cacheable) {
700
701 size = 0;
702 cl = out;
703 ll = NULL;
704 prev_last_shadow = 1;
705
706 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, p->log, 0,
707 "pipe offset: %O", p->temp_file->offset);
708
709 do {
710 bsize = cl->buf->last - cl->buf->pos;
711
712 ngx_log_debug4(NGX_LOG_DEBUG_EVENT, p->log, 0,
713 "pipe buf ls:%d %p, pos %p, size: %z",
714 cl->buf->last_shadow, cl->buf->start,
715 cl->buf->pos, bsize);
716
717 if (prev_last_shadow
718 && ((size + bsize > p->temp_file_write_size)
719 || (p->temp_file->offset + size + bsize
720 > p->max_temp_file_size)))
721 {
722 break;
723 }
724
725 prev_last_shadow = cl->buf->last_shadow;
726
727 size += bsize;
728 ll = &cl->next;
729 cl = cl->next;
730
731 } while (cl);
732
733 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, p->log, 0, "size: %z", size);
734
735 if (ll == NULL) {
736 return NGX_BUSY;
737 }
738
739 if (cl) {
740 p->in = cl;
741 *ll = NULL;
742
743 } else {
744 p->in = NULL;
745 p->last_in = &p->in;
746 }
747
748 } else {
749 p->in = NULL;
750 p->last_in = &p->in;
751 }
752
753 n = ngx_write_chain_to_temp_file(p->temp_file, out);
754
755 if (n == NGX_ERROR) {
756 return NGX_ABORT;
757 }
758
759 if (p->buf_to_file) {
760 p->temp_file->offset = p->buf_to_file->last - p->buf_to_file->pos;
761 n -= p->buf_to_file->last - p->buf_to_file->pos;
762 p->buf_to_file = NULL;
763 out = out->next;
764 }
765
766 if (n > 0) {
767 /* update previous buffer or add new buffer */
768
769 if (p->out) {
770 for (cl = p->out; cl->next; cl = cl->next) { /* void */ }
771
772 b = cl->buf;
773
774 if (b->file_last == p->temp_file->offset) {
775 p->temp_file->offset += n;
776 b->file_last = p->temp_file->offset;
777 goto free;
778 }
779
780 last_out = &cl->next;
781
782 } else {
783 last_out = &p->out;
784 }
785
786 cl = ngx_chain_get_free_buf(p->pool, &p->free);
787 if (cl == NULL) {
788 return NGX_ABORT;
789 }
790
791 b = cl->buf;
792
793 ngx_memzero(b, sizeof(ngx_buf_t));
794
795 b->tag = p->tag;
796
797 b->file = &p->temp_file->file;
798 b->file_pos = p->temp_file->offset;
799 p->temp_file->offset += n;
800 b->file_last = p->temp_file->offset;
801
802 b->in_file = 1;
803 b->temp_file = 1;
804
805 *last_out = cl;
806 }
807
808 free:
809
810 for (last_free = &p->free_raw_bufs;
811 *last_free != NULL;
812 last_free = &(*last_free)->next)
813 {
814 /* void */
815 }
816
817 for (cl = out; cl; cl = next) {
818 next = cl->next;
819
820 cl->next = p->free;
821 p->free = cl;
822
823 b = cl->buf;
824
825 if (b->last_shadow) {
826
827 tl = ngx_alloc_chain_link(p->pool);
828 if (tl == NULL) {
829 return NGX_ABORT;
830 }
831
832 tl->buf = b->shadow;
833 tl->next = NULL;
834
835 *last_free = tl;
836 last_free = &tl->next;
837
838 b->shadow->pos = b->shadow->start;
839 b->shadow->last = b->shadow->start;
840
841 ngx_event_pipe_remove_shadow_links(b->shadow);
842 }
843 }
844
845 return NGX_OK;
846 }
847
848
849 /* the copy input filter */
850
851 ngx_int_t
852 ngx_event_pipe_copy_input_filter(ngx_event_pipe_t *p, ngx_buf_t *buf)
853 {
854 ngx_buf_t *b;
855 ngx_chain_t *cl;
856
857 if (buf->pos == buf->last) {
858 return NGX_OK;
859 }
860
861 if (p->free) {
862 cl = p->free;
863 b = cl->buf;
864 p->free = cl->next;
865 ngx_free_chain(p->pool, cl);
866
867 } else {
868 b = ngx_alloc_buf(p->pool);
869 if (b == NULL) {
870 return NGX_ERROR;
871 }
872 }
873
874 ngx_memcpy(b, buf, sizeof(ngx_buf_t));
875 b->shadow = buf;
876 b->tag = p->tag;
877 b->last_shadow = 1;
878 b->recycled = 1;
879 buf->shadow = b;
880
881 cl = ngx_alloc_chain_link(p->pool);
882 if (cl == NULL) {
883 return NGX_ERROR;
884 }
885
886 cl->buf = b;
887 cl->next = NULL;
888
889 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, p->log, 0, "input buf #%d", b->num);
890
891 if (p->in) {
892 *p->last_in = cl;
893 } else {
894 p->in = cl;
895 }
896 p->last_in = &cl->next;
897
898 if (p->length == -1) {
899 return NGX_OK;
900 }
901
902 p->length -= b->last - b->pos;
903
904 return NGX_OK;
905 }
906
907
908 static ngx_inline void
909 ngx_event_pipe_remove_shadow_links(ngx_buf_t *buf)
910 {
911 ngx_buf_t *b, *next;
912
913 b = buf->shadow;
914
915 if (b == NULL) {
916 return;
917 }
918
919 while (!b->last_shadow) {
920 next = b->shadow;
921
922 b->temporary = 0;
923 b->recycled = 0;
924
925 b->shadow = NULL;
926 b = next;
927 }
928
929 b->temporary = 0;
930 b->recycled = 0;
931 b->last_shadow = 0;
932
933 b->shadow = NULL;
934
935 buf->shadow = NULL;
936 }
937
938
939 ngx_int_t
940 ngx_event_pipe_add_free_buf(ngx_event_pipe_t *p, ngx_buf_t *b)
941 {
942 ngx_chain_t *cl;
943
944 cl = ngx_alloc_chain_link(p->pool);
945 if (cl == NULL) {
946 return NGX_ERROR;
947 }
948
949 if (p->buf_to_file && b->start == p->buf_to_file->start) {
950 b->pos = p->buf_to_file->last;
951 b->last = p->buf_to_file->last;
952
953 } else {
954 b->pos = b->start;
955 b->last = b->start;
956 }
957
958 b->shadow = NULL;
959
960 cl->buf = b;
961
962 if (p->free_raw_bufs == NULL) {
963 p->free_raw_bufs = cl;
964 cl->next = NULL;
965
966 return NGX_OK;
967 }
968
969 if (p->free_raw_bufs->buf->pos == p->free_raw_bufs->buf->last) {
970
971 /* add the free buf to the list start */
972
973 cl->next = p->free_raw_bufs;
974 p->free_raw_bufs = cl;
975
976 return NGX_OK;
977 }
978
979 /* the first free buf is partially filled, thus add the free buf after it */
980
981 cl->next = p->free_raw_bufs->next;
982 p->free_raw_bufs->next = cl;
983
984 return NGX_OK;
985 }
986
987
988 static ngx_int_t
989 ngx_event_pipe_drain_chains(ngx_event_pipe_t *p)
990 {
991 ngx_chain_t *cl, *tl;
992
993 for ( ;; ) {
994 if (p->busy) {
995 cl = p->busy;
996 p->busy = NULL;
997
998 } else if (p->out) {
999 cl = p->out;
1000 p->out = NULL;
1001
1002 } else if (p->in) {
1003 cl = p->in;
1004 p->in = NULL;
1005
1006 } else {
1007 return NGX_OK;
1008 }
1009
1010 while (cl) {
1011 if (cl->buf->last_shadow) {
1012 if (ngx_event_pipe_add_free_buf(p, cl->buf->shadow) != NGX_OK) {
1013 return NGX_ABORT;
1014 }
1015
1016 cl->buf->last_shadow = 0;
1017 }
1018
1019 cl->buf->shadow = NULL;
1020 tl = cl->next;
1021 cl->next = p->free;
1022 p->free = cl;
1023 cl = tl;
1024 }
1025 }
1026 }
Tomato firmware and modifications.