0
|
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
|
|
11
|
18
|
12 #if 0
|
|
13 #define NGX_SENDFILE_LIMIT 4096
|
|
14 #endif
|
|
15
|
420
|
16 /*
|
|
17 * When DIRECTIO is enabled FreeBSD, Solaris, and MacOSX read directly
|
|
18 * to an application memory from a device if parameters are aligned
|
518
|
19 * to device sector boundary (512 bytes). They fallback to usual read
|
420
|
20 * operation if the parameters are not aligned.
|
|
21 * Linux allows DIRECTIO only if the parameters are aligned to a filesystem
|
|
22 * sector boundary, otherwise it returns EINVAL. The sector size is
|
|
23 * usually 512 bytes, however, on XFS it may be 4096 bytes.
|
|
24 */
|
18
|
25
|
|
26 #define NGX_NONE 1
|
0
|
27
|
|
28
|
16
|
29 static ngx_inline ngx_int_t
|
406
|
30 ngx_output_chain_as_is(ngx_output_chain_ctx_t *ctx, ngx_buf_t *buf);
|
18
|
31 static ngx_int_t ngx_output_chain_add_copy(ngx_pool_t *pool,
|
48
|
32 ngx_chain_t **chain, ngx_chain_t *in);
|
406
|
33 static ngx_int_t ngx_output_chain_align_file_buf(ngx_output_chain_ctx_t *ctx,
|
|
34 off_t bsize);
|
|
35 static ngx_int_t ngx_output_chain_get_buf(ngx_output_chain_ctx_t *ctx,
|
|
36 off_t bsize);
|
|
37 static ngx_int_t ngx_output_chain_copy_buf(ngx_output_chain_ctx_t *ctx);
|
0
|
38
|
|
39
|
48
|
40 ngx_int_t
|
|
41 ngx_output_chain(ngx_output_chain_ctx_t *ctx, ngx_chain_t *in)
|
0
|
42 {
|
22
|
43 off_t bsize;
|
146
|
44 ngx_int_t rc, last;
|
0
|
45 ngx_chain_t *cl, *out, **last_out;
|
|
46
|
4
|
47 if (ctx->in == NULL && ctx->busy == NULL) {
|
0
|
48
|
18
|
49 /*
|
|
50 * the short path for the case when the ctx->in and ctx->busy chains
|
|
51 * are empty, the incoming chain is empty too or has the single buf
|
|
52 * that does not require the copy
|
|
53 */
|
0
|
54
|
|
55 if (in == NULL) {
|
|
56 return ctx->output_filter(ctx->filter_ctx, in);
|
|
57 }
|
|
58
|
|
59 if (in->next == NULL
|
18
|
60 #if (NGX_SENDFILE_LIMIT)
|
|
61 && !(in->buf->in_file && in->buf->file_last > NGX_SENDFILE_LIMIT)
|
|
62 #endif
|
406
|
63 && ngx_output_chain_as_is(ctx, in->buf))
|
0
|
64 {
|
|
65 return ctx->output_filter(ctx->filter_ctx, in);
|
|
66 }
|
|
67 }
|
|
68
|
|
69 /* add the incoming buf to the chain ctx->in */
|
|
70
|
|
71 if (in) {
|
18
|
72 if (ngx_output_chain_add_copy(ctx->pool, &ctx->in, in) == NGX_ERROR) {
|
0
|
73 return NGX_ERROR;
|
|
74 }
|
|
75 }
|
|
76
|
|
77 out = NULL;
|
|
78 last_out = &out;
|
48
|
79 last = NGX_NONE;
|
0
|
80
|
|
81 for ( ;; ) {
|
|
82
|
|
83 while (ctx->in) {
|
|
84
|
|
85 /*
|
|
86 * cycle while there are the ctx->in bufs
|
406
|
87 * and there are the free output bufs to copy in
|
0
|
88 */
|
|
89
|
|
90 bsize = ngx_buf_size(ctx->in->buf);
|
|
91
|
|
92 if (bsize == 0 && !ngx_buf_special(ctx->in->buf)) {
|
|
93
|
|
94 ngx_log_error(NGX_LOG_ALERT, ctx->pool->log, 0,
|
32
|
95 "zero size buf in output "
|
|
96 "t:%d r:%d f:%d %p %p-%p %p %O-%O",
|
|
97 ctx->in->buf->temporary,
|
|
98 ctx->in->buf->recycled,
|
|
99 ctx->in->buf->in_file,
|
|
100 ctx->in->buf->start,
|
|
101 ctx->in->buf->pos,
|
|
102 ctx->in->buf->last,
|
|
103 ctx->in->buf->file,
|
|
104 ctx->in->buf->file_pos,
|
|
105 ctx->in->buf->file_last);
|
0
|
106
|
22
|
107 ngx_debug_point();
|
|
108
|
0
|
109 ctx->in = ctx->in->next;
|
|
110
|
|
111 continue;
|
|
112 }
|
|
113
|
406
|
114 if (ngx_output_chain_as_is(ctx, ctx->in->buf)) {
|
0
|
115
|
|
116 /* move the chain link to the output chain */
|
|
117
|
|
118 cl = ctx->in;
|
|
119 ctx->in = cl->next;
|
|
120
|
|
121 *last_out = cl;
|
|
122 last_out = &cl->next;
|
|
123 cl->next = NULL;
|
|
124
|
|
125 continue;
|
|
126 }
|
|
127
|
|
128 if (ctx->buf == NULL) {
|
|
129
|
406
|
130 rc = ngx_output_chain_align_file_buf(ctx, bsize);
|
0
|
131
|
406
|
132 if (rc == NGX_ERROR) {
|
|
133 return NGX_ERROR;
|
|
134 }
|
0
|
135
|
406
|
136 if (rc != NGX_OK) {
|
0
|
137
|
406
|
138 if (ctx->free) {
|
0
|
139
|
406
|
140 /* get the free buf */
|
0
|
141
|
406
|
142 cl = ctx->free;
|
|
143 ctx->buf = cl->buf;
|
|
144 ctx->free = cl->next;
|
0
|
145
|
406
|
146 ngx_free_chain(ctx->pool, cl);
|
0
|
147
|
406
|
148 } else if (out || ctx->allocated == ctx->bufs.num) {
|
0
|
149
|
406
|
150 break;
|
0
|
151
|
406
|
152 } else if (ngx_output_chain_get_buf(ctx, bsize) != NGX_OK) {
|
0
|
153 return NGX_ERROR;
|
|
154 }
|
|
155 }
|
|
156 }
|
|
157
|
406
|
158 rc = ngx_output_chain_copy_buf(ctx);
|
0
|
159
|
|
160 if (rc == NGX_ERROR) {
|
|
161 return rc;
|
|
162 }
|
|
163
|
|
164 if (rc == NGX_AGAIN) {
|
|
165 if (out) {
|
|
166 break;
|
|
167 }
|
|
168
|
|
169 return rc;
|
|
170 }
|
|
171
|
|
172 /* delete the completed buf from the ctx->in chain */
|
|
173
|
|
174 if (ngx_buf_size(ctx->in->buf) == 0) {
|
|
175 ctx->in = ctx->in->next;
|
|
176 }
|
|
177
|
50
|
178 cl = ngx_alloc_chain_link(ctx->pool);
|
|
179 if (cl == NULL) {
|
10
|
180 return NGX_ERROR;
|
|
181 }
|
50
|
182
|
10
|
183 cl->buf = ctx->buf;
|
|
184 cl->next = NULL;
|
0
|
185 *last_out = cl;
|
|
186 last_out = &cl->next;
|
|
187 ctx->buf = NULL;
|
|
188 }
|
|
189
|
|
190 if (out == NULL && last != NGX_NONE) {
|
58
|
191
|
|
192 if (ctx->in) {
|
|
193 return NGX_AGAIN;
|
|
194 }
|
|
195
|
0
|
196 return last;
|
|
197 }
|
|
198
|
|
199 last = ctx->output_filter(ctx->filter_ctx, out);
|
|
200
|
118
|
201 if (last == NGX_ERROR || last == NGX_DONE) {
|
|
202 return last;
|
|
203 }
|
|
204
|
0
|
205 ngx_chain_update_chains(&ctx->free, &ctx->busy, &out, ctx->tag);
|
|
206 last_out = &out;
|
|
207 }
|
|
208 }
|
|
209
|
|
210
|
16
|
211 static ngx_inline ngx_int_t
|
406
|
212 ngx_output_chain_as_is(ngx_output_chain_ctx_t *ctx, ngx_buf_t *buf)
|
0
|
213 {
|
18
|
214 ngx_uint_t sendfile;
|
|
215
|
0
|
216 if (ngx_buf_special(buf)) {
|
406
|
217 return 1;
|
|
218 }
|
|
219
|
|
220 if (buf->in_file && buf->file->directio) {
|
0
|
221 return 0;
|
|
222 }
|
|
223
|
18
|
224 sendfile = ctx->sendfile;
|
|
225
|
|
226 #if (NGX_SENDFILE_LIMIT)
|
|
227
|
|
228 if (buf->in_file && buf->file_pos >= NGX_SENDFILE_LIMIT) {
|
|
229 sendfile = 0;
|
|
230 }
|
|
231
|
|
232 #endif
|
|
233
|
|
234 if (!sendfile) {
|
4
|
235
|
0
|
236 if (!ngx_buf_in_memory(buf)) {
|
406
|
237 return 0;
|
0
|
238 }
|
|
239
|
|
240 buf->in_file = 0;
|
|
241 }
|
|
242
|
|
243 if (ctx->need_in_memory && !ngx_buf_in_memory(buf)) {
|
406
|
244 return 0;
|
0
|
245 }
|
|
246
|
|
247 if (ctx->need_in_temp && (buf->memory || buf->mmap)) {
|
406
|
248 return 0;
|
0
|
249 }
|
|
250
|
406
|
251 return 1;
|
0
|
252 }
|
|
253
|
|
254
|
48
|
255 static ngx_int_t
|
|
256 ngx_output_chain_add_copy(ngx_pool_t *pool, ngx_chain_t **chain,
|
|
257 ngx_chain_t *in)
|
18
|
258 {
|
|
259 ngx_chain_t *cl, **ll;
|
|
260 #if (NGX_SENDFILE_LIMIT)
|
|
261 ngx_buf_t *b, *buf;
|
|
262 #endif
|
|
263
|
|
264 ll = chain;
|
|
265
|
|
266 for (cl = *chain; cl; cl = cl->next) {
|
|
267 ll = &cl->next;
|
|
268 }
|
|
269
|
|
270 while (in) {
|
|
271
|
50
|
272 cl = ngx_alloc_chain_link(pool);
|
|
273 if (cl == NULL) {
|
18
|
274 return NGX_ERROR;
|
|
275 }
|
|
276
|
|
277 #if (NGX_SENDFILE_LIMIT)
|
|
278
|
|
279 buf = in->buf;
|
|
280
|
|
281 if (buf->in_file
|
|
282 && buf->file_pos < NGX_SENDFILE_LIMIT
|
|
283 && buf->file_last > NGX_SENDFILE_LIMIT)
|
|
284 {
|
406
|
285 /* split a file buf on two bufs by the sendfile limit */
|
|
286
|
50
|
287 b = ngx_calloc_buf(pool);
|
|
288 if (b == NULL) {
|
18
|
289 return NGX_ERROR;
|
|
290 }
|
|
291
|
|
292 ngx_memcpy(b, buf, sizeof(ngx_buf_t));
|
|
293
|
|
294 if (ngx_buf_in_memory(buf)) {
|
|
295 buf->pos += (ssize_t) (NGX_SENDFILE_LIMIT - buf->file_pos);
|
|
296 b->last = buf->pos;
|
|
297 }
|
|
298
|
|
299 buf->file_pos = NGX_SENDFILE_LIMIT;
|
|
300 b->file_last = NGX_SENDFILE_LIMIT;
|
|
301
|
|
302 cl->buf = b;
|
|
303
|
|
304 } else {
|
|
305 cl->buf = buf;
|
|
306 in = in->next;
|
|
307 }
|
|
308
|
|
309 #else
|
|
310 cl->buf = in->buf;
|
|
311 in = in->next;
|
|
312
|
|
313 #endif
|
|
314
|
496
|
315 cl->next = NULL;
|
18
|
316 *ll = cl;
|
|
317 ll = &cl->next;
|
|
318 }
|
|
319
|
|
320 return NGX_OK;
|
|
321 }
|
|
322
|
|
323
|
48
|
324 static ngx_int_t
|
406
|
325 ngx_output_chain_align_file_buf(ngx_output_chain_ctx_t *ctx, off_t bsize)
|
|
326 {
|
|
327 size_t size;
|
|
328 ngx_buf_t *in;
|
|
329
|
|
330 in = ctx->in->buf;
|
|
331
|
|
332 if (in->file == NULL || !in->file->directio) {
|
|
333 return NGX_DECLINED;
|
|
334 }
|
|
335
|
|
336 ctx->directio = 1;
|
|
337
|
518
|
338 size = (size_t) (in->file_pos - (in->file_pos & ~(ctx->alignment - 1)));
|
406
|
339
|
|
340 if (size == 0) {
|
|
341
|
408
|
342 if (bsize >= (off_t) ctx->bufs.size) {
|
406
|
343 return NGX_DECLINED;
|
|
344 }
|
|
345
|
|
346 size = (size_t) bsize;
|
|
347
|
|
348 } else {
|
518
|
349 size = (size_t) ctx->alignment - size;
|
406
|
350
|
408
|
351 if ((off_t) size > bsize) {
|
406
|
352 size = (size_t) bsize;
|
|
353 }
|
|
354 }
|
|
355
|
|
356 ctx->buf = ngx_create_temp_buf(ctx->pool, size);
|
|
357 if (ctx->buf == NULL) {
|
|
358 return NGX_ERROR;
|
|
359 }
|
|
360
|
|
361 /*
|
|
362 * we do not set ctx->buf->tag, because we do not want
|
|
363 * to reuse the buf via ctx->free list
|
|
364 */
|
|
365
|
410
|
366 #if (NGX_HAVE_ALIGNED_DIRECTIO)
|
|
367 ctx->unaligned = 1;
|
|
368 #endif
|
|
369
|
406
|
370 return NGX_OK;
|
|
371 }
|
|
372
|
|
373
|
|
374 static ngx_int_t
|
|
375 ngx_output_chain_get_buf(ngx_output_chain_ctx_t *ctx, off_t bsize)
|
0
|
376 {
|
406
|
377 size_t size;
|
|
378 ngx_buf_t *b, *in;
|
|
379 ngx_uint_t recycled;
|
|
380
|
|
381 in = ctx->in->buf;
|
|
382 size = ctx->bufs.size;
|
|
383 recycled = 1;
|
|
384
|
|
385 if (in->last_in_chain) {
|
|
386
|
|
387 if (bsize < (off_t) size) {
|
|
388
|
|
389 /*
|
|
390 * allocate a small temp buf for a small last buf
|
|
391 * or its small last part
|
|
392 */
|
|
393
|
|
394 size = (size_t) bsize;
|
|
395 recycled = 0;
|
|
396
|
|
397 } else if (!ctx->directio
|
|
398 && ctx->bufs.num == 1
|
|
399 && (bsize < (off_t) (size + size / 4)))
|
|
400 {
|
|
401 /*
|
|
402 * allocate a temp buf that equals to a last buf,
|
|
403 * if there is no directio, the last buf size is lesser
|
|
404 * than 1.25 of bufs.size and the temp buf is single
|
|
405 */
|
|
406
|
|
407 size = (size_t) bsize;
|
|
408 recycled = 0;
|
|
409 }
|
|
410 }
|
|
411
|
|
412 b = ngx_calloc_buf(ctx->pool);
|
|
413 if (b == NULL) {
|
|
414 return NGX_ERROR;
|
|
415 }
|
|
416
|
|
417 if (ctx->directio) {
|
|
418
|
|
419 /*
|
|
420 * allocate block aligned to a disk sector size to enable
|
|
421 * userland buffer direct usage conjunctly with directio
|
|
422 */
|
|
423
|
518
|
424 b->start = ngx_pmemalign(ctx->pool, size, (size_t) ctx->alignment);
|
406
|
425 if (b->start == NULL) {
|
|
426 return NGX_ERROR;
|
|
427 }
|
|
428
|
|
429 } else {
|
|
430 b->start = ngx_palloc(ctx->pool, size);
|
|
431 if (b->start == NULL) {
|
|
432 return NGX_ERROR;
|
|
433 }
|
|
434 }
|
|
435
|
|
436 b->pos = b->start;
|
|
437 b->last = b->start;
|
|
438 b->end = b->last + size;
|
|
439 b->temporary = 1;
|
|
440 b->tag = ctx->tag;
|
|
441 b->recycled = recycled;
|
|
442
|
|
443 ctx->buf = b;
|
|
444 ctx->allocated++;
|
|
445
|
|
446 return NGX_OK;
|
|
447 }
|
|
448
|
|
449
|
|
450 static ngx_int_t
|
|
451 ngx_output_chain_copy_buf(ngx_output_chain_ctx_t *ctx)
|
|
452 {
|
|
453 off_t size;
|
|
454 ssize_t n;
|
|
455 ngx_buf_t *src, *dst;
|
|
456 ngx_uint_t sendfile;
|
|
457
|
|
458 src = ctx->in->buf;
|
|
459 dst = ctx->buf;
|
0
|
460
|
|
461 size = ngx_buf_size(src);
|
|
462
|
22
|
463 if (size > dst->end - dst->pos) {
|
0
|
464 size = dst->end - dst->pos;
|
|
465 }
|
|
466
|
406
|
467 sendfile = ctx->sendfile & !ctx->directio;
|
|
468
|
18
|
469 #if (NGX_SENDFILE_LIMIT)
|
|
470
|
|
471 if (src->in_file && src->file_pos >= NGX_SENDFILE_LIMIT) {
|
|
472 sendfile = 0;
|
|
473 }
|
|
474
|
|
475 #endif
|
|
476
|
0
|
477 if (ngx_buf_in_memory(src)) {
|
22
|
478 ngx_memcpy(dst->pos, src->pos, (size_t) size);
|
|
479 src->pos += (size_t) size;
|
|
480 dst->last += (size_t) size;
|
0
|
481
|
4
|
482 if (src->in_file) {
|
|
483
|
|
484 if (sendfile) {
|
|
485 dst->in_file = 1;
|
|
486 dst->file = src->file;
|
|
487 dst->file_pos = src->file_pos;
|
|
488 dst->file_last = src->file_pos + size;
|
|
489
|
|
490 } else {
|
|
491 dst->in_file = 0;
|
|
492 }
|
|
493
|
0
|
494 src->file_pos += size;
|
2
|
495
|
|
496 } else {
|
|
497 dst->in_file = 0;
|
0
|
498 }
|
|
499
|
306
|
500 if (src->pos == src->last) {
|
|
501 dst->flush = src->flush;
|
|
502 dst->last_buf = src->last_buf;
|
496
|
503 dst->last_in_chain = src->last_in_chain;
|
0
|
504 }
|
|
505
|
|
506 } else {
|
410
|
507
|
|
508 #if (NGX_HAVE_ALIGNED_DIRECTIO)
|
|
509
|
|
510 if (ctx->unaligned) {
|
|
511 if (ngx_directio_off(src->file->fd) == -1) {
|
|
512 ngx_log_error(NGX_LOG_ALERT, ctx->pool->log, ngx_errno,
|
|
513 ngx_directio_off_n " \"%s\" failed",
|
|
514 src->file->name.data);
|
|
515 }
|
|
516 }
|
|
517
|
|
518 #endif
|
|
519
|
518
|
520 #if (NGX_HAVE_FILE_AIO)
|
|
521
|
|
522 if (ctx->aio) {
|
|
523 n = ngx_file_aio_read(src->file, dst->pos, (size_t) size,
|
|
524 src->file_pos, ctx->pool);
|
|
525 if (n == NGX_AGAIN) {
|
|
526 ctx->aio(ctx, src->file);
|
|
527 return NGX_AGAIN;
|
|
528 }
|
|
529
|
|
530 } else {
|
|
531 n = ngx_read_file(src->file, dst->pos, (size_t) size,
|
|
532 src->file_pos);
|
|
533 }
|
|
534 #else
|
|
535
|
22
|
536 n = ngx_read_file(src->file, dst->pos, (size_t) size, src->file_pos);
|
0
|
537
|
518
|
538 #endif
|
|
539
|
410
|
540 #if (NGX_HAVE_ALIGNED_DIRECTIO)
|
|
541
|
|
542 if (ctx->unaligned) {
|
|
543 ngx_err_t err;
|
|
544
|
|
545 err = ngx_errno;
|
|
546
|
|
547 if (ngx_directio_on(src->file->fd) == -1) {
|
|
548 ngx_log_error(NGX_LOG_ALERT, ctx->pool->log, ngx_errno,
|
|
549 ngx_directio_on_n " \"%s\" failed",
|
|
550 src->file->name.data);
|
|
551 }
|
|
552
|
|
553 ngx_set_errno(err);
|
|
554
|
|
555 ctx->unaligned = 0;
|
|
556 }
|
|
557
|
|
558 #endif
|
|
559
|
0
|
560 if (n == NGX_ERROR) {
|
66
|
561 return (ngx_int_t) n;
|
0
|
562 }
|
|
563
|
22
|
564 if (n != size) {
|
406
|
565 ngx_log_error(NGX_LOG_ALERT, ctx->pool->log, 0,
|
410
|
566 ngx_read_file_n " read only %z of %O from \"%s\"",
|
|
567 n, size, src->file->name.data);
|
0
|
568 if (n == 0) {
|
|
569 return NGX_ERROR;
|
|
570 }
|
|
571 }
|
|
572
|
|
573 dst->last += n;
|
|
574
|
2
|
575 if (sendfile) {
|
|
576 dst->in_file = 1;
|
|
577 dst->file = src->file;
|
|
578 dst->file_pos = src->file_pos;
|
4
|
579 dst->file_last = src->file_pos + n;
|
2
|
580
|
|
581 } else {
|
0
|
582 dst->in_file = 0;
|
|
583 }
|
|
584
|
4
|
585 src->file_pos += n;
|
|
586
|
308
|
587 if (src->file_pos == src->file_last) {
|
306
|
588 dst->flush = src->flush;
|
|
589 dst->last_buf = src->last_buf;
|
496
|
590 dst->last_in_chain = src->last_in_chain;
|
0
|
591 }
|
|
592 }
|
|
593
|
|
594 return NGX_OK;
|
|
595 }
|
|
596
|
|
597
|
48
|
598 ngx_int_t
|
|
599 ngx_chain_writer(void *data, ngx_chain_t *in)
|
0
|
600 {
|
|
601 ngx_chain_writer_ctx_t *ctx = data;
|
|
602
|
372
|
603 off_t size;
|
|
604 ngx_chain_t *cl;
|
|
605 ngx_connection_t *c;
|
|
606
|
|
607 c = ctx->connection;
|
0
|
608
|
22
|
609 for (size = 0; in; in = in->next) {
|
|
610
|
|
611 #if 1
|
|
612 if (ngx_buf_size(in->buf) == 0 && !ngx_buf_special(in->buf)) {
|
|
613 ngx_debug_point();
|
|
614 }
|
|
615 #endif
|
|
616
|
|
617 size += ngx_buf_size(in->buf);
|
0
|
618
|
372
|
619 ngx_log_debug2(NGX_LOG_DEBUG_CORE, c->log, 0,
|
306
|
620 "chain writer buf fl:%d s:%uO",
|
|
621 in->buf->flush, ngx_buf_size(in->buf));
|
0
|
622
|
50
|
623 cl = ngx_alloc_chain_link(ctx->pool);
|
|
624 if (cl == NULL) {
|
10
|
625 return NGX_ERROR;
|
|
626 }
|
50
|
627
|
10
|
628 cl->buf = in->buf;
|
|
629 cl->next = NULL;
|
0
|
630 *ctx->last = cl;
|
|
631 ctx->last = &cl->next;
|
|
632 }
|
|
633
|
372
|
634 ngx_log_debug1(NGX_LOG_DEBUG_CORE, c->log, 0,
|
10
|
635 "chain writer in: %p", ctx->out);
|
0
|
636
|
22
|
637 for (cl = ctx->out; cl; cl = cl->next) {
|
|
638
|
|
639 #if 1
|
|
640 if (ngx_buf_size(cl->buf) == 0 && !ngx_buf_special(cl->buf)) {
|
|
641 ngx_debug_point();
|
|
642 }
|
|
643
|
|
644 #endif
|
|
645
|
|
646 size += ngx_buf_size(cl->buf);
|
|
647 }
|
|
648
|
372
|
649 if (size == 0 && !c->buffered) {
|
22
|
650 return NGX_OK;
|
|
651 }
|
|
652
|
372
|
653 ctx->out = c->send_chain(c, ctx->out, ctx->limit);
|
0
|
654
|
372
|
655 ngx_log_debug1(NGX_LOG_DEBUG_CORE, c->log, 0,
|
10
|
656 "chain writer out: %p", ctx->out);
|
0
|
657
|
|
658 if (ctx->out == NGX_CHAIN_ERROR) {
|
|
659 return NGX_ERROR;
|
|
660 }
|
|
661
|
|
662 if (ctx->out == NULL) {
|
|
663 ctx->last = &ctx->out;
|
302
|
664
|
372
|
665 if (!c->buffered) {
|
304
|
666 return NGX_OK;
|
|
667 }
|
0
|
668 }
|
|
669
|
|
670 return NGX_AGAIN;
|
|
671 }
|