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
|
|
12 /*
|
28
|
13 * Although FreeBSD sendfile() allows to pass a header and a trailer,
|
0
|
14 * it can not send a header with a part of the file in one packet until
|
28
|
15 * FreeBSD 5.3. Besides, over the fast ethernet connection sendfile()
|
0
|
16 * may send the partially filled packets, i.e. the 8 file pages may be sent
|
|
17 * as the 11 full 1460-bytes packets, then one incomplete 324-bytes packet,
|
|
18 * and then again the 11 full 1460-bytes packets.
|
|
19 *
|
28
|
20 * Threfore we use the TCP_NOPUSH option (similar to Linux's TCP_CORK)
|
|
21 * to postpone the sending - it not only sends a header and the first part of
|
|
22 * the file in one packet, but also sends the file pages in the full packets.
|
0
|
23 *
|
50
|
24 * But until FreeBSD 4.5 turning TCP_NOPUSH off does not flush a pending
|
|
25 * data that less than MSS, so that data may be sent with 5 second delay.
|
|
26 * So we do not use TCP_NOPUSH on FreeBSD prior to 4.5, although it can be used
|
0
|
27 * for non-keepalive HTTP connections.
|
|
28 */
|
|
29
|
|
30
|
|
31 #define NGX_HEADERS 8
|
50
|
32 #define NGX_TRAILERS 8
|
0
|
33
|
|
34
|
50
|
35 ngx_chain_t *
|
|
36 ngx_freebsd_sendfile_chain(ngx_connection_t *c, ngx_chain_t *in, off_t limit)
|
0
|
37 {
|
|
38 int rc;
|
|
39 u_char *prev;
|
22
|
40 off_t size, send, prev_send, aligned, sent, fprev;
|
|
41 size_t header_size, file_size;
|
0
|
42 ngx_uint_t eintr, eagain, complete;
|
|
43 ngx_err_t err;
|
|
44 ngx_buf_t *file;
|
|
45 ngx_array_t header, trailer;
|
|
46 ngx_event_t *wev;
|
|
47 ngx_chain_t *cl;
|
|
48 struct sf_hdtr hdtr;
|
|
49 struct iovec *iov, headers[NGX_HEADERS], trailers[NGX_TRAILERS];
|
|
50
|
|
51 wev = c->write;
|
|
52
|
|
53 if (!wev->ready) {
|
|
54 return in;
|
|
55 }
|
|
56
|
18
|
57 #if (NGX_HAVE_KQUEUE)
|
0
|
58
|
4
|
59 if ((ngx_event_flags & NGX_USE_KQUEUE_EVENT) && wev->pending_eof) {
|
0
|
60 ngx_log_error(NGX_LOG_INFO, c->log, wev->kq_errno,
|
|
61 "kevent() reported about an closed connection");
|
|
62
|
|
63 wev->error = 1;
|
|
64 return NGX_CHAIN_ERROR;
|
|
65 }
|
|
66
|
|
67 #endif
|
|
68
|
22
|
69 /* the maximum limit size is the maximum size_t value - the page size */
|
|
70
|
26
|
71 if (limit == 0 || limit > NGX_MAX_SIZE_T_VALUE - ngx_pagesize) {
|
|
72 limit = NGX_MAX_SIZE_T_VALUE - ngx_pagesize;
|
22
|
73 }
|
|
74
|
0
|
75 send = 0;
|
|
76 eagain = 0;
|
|
77
|
|
78 header.elts = headers;
|
|
79 header.size = sizeof(struct iovec);
|
|
80 header.nalloc = NGX_HEADERS;
|
|
81 header.pool = c->pool;
|
|
82
|
|
83 trailer.elts = trailers;
|
|
84 trailer.size = sizeof(struct iovec);
|
|
85 trailer.nalloc = NGX_TRAILERS;
|
|
86 trailer.pool = c->pool;
|
|
87
|
|
88 for ( ;; ) {
|
|
89 file = NULL;
|
22
|
90 file_size = 0;
|
|
91 header_size = 0;
|
0
|
92 eintr = 0;
|
|
93 complete = 0;
|
22
|
94 prev_send = send;
|
0
|
95
|
|
96 header.nelts = 0;
|
|
97 trailer.nelts = 0;
|
|
98
|
|
99 /* create the header iovec and coalesce the neighbouring bufs */
|
|
100
|
|
101 prev = NULL;
|
|
102 iov = NULL;
|
|
103
|
|
104 for (cl = in;
|
|
105 cl && header.nelts < IOV_MAX && send < limit;
|
|
106 cl = cl->next)
|
|
107 {
|
|
108 if (ngx_buf_special(cl->buf)) {
|
|
109 continue;
|
|
110 }
|
|
111
|
|
112 if (!ngx_buf_in_memory_only(cl->buf)) {
|
|
113 break;
|
|
114 }
|
|
115
|
|
116 size = cl->buf->last - cl->buf->pos;
|
|
117
|
|
118 if (send + size > limit) {
|
|
119 size = limit - send;
|
|
120 }
|
|
121
|
|
122 if (prev == cl->buf->pos) {
|
22
|
123 iov->iov_len += (size_t) size;
|
0
|
124
|
|
125 } else {
|
50
|
126 iov = ngx_array_push(&header);
|
|
127 if (iov == NULL) {
|
0
|
128 return NGX_CHAIN_ERROR;
|
|
129 }
|
|
130
|
|
131 iov->iov_base = (void *) cl->buf->pos;
|
22
|
132 iov->iov_len = (size_t) size;
|
0
|
133 }
|
|
134
|
22
|
135 prev = cl->buf->pos + (size_t) size;
|
|
136 header_size += (size_t) size;
|
0
|
137 send += size;
|
|
138 }
|
|
139
|
|
140
|
|
141 if (cl && cl->buf->in_file && send < limit) {
|
|
142 file = cl->buf;
|
|
143
|
|
144 /* coalesce the neighbouring file bufs */
|
|
145
|
|
146 do {
|
22
|
147 size = cl->buf->file_last - cl->buf->file_pos;
|
0
|
148
|
|
149 if (send + size > limit) {
|
|
150 size = limit - send;
|
|
151
|
|
152 aligned = (cl->buf->file_pos + size + ngx_pagesize - 1)
|
|
153 & ~(ngx_pagesize - 1);
|
|
154
|
|
155 if (aligned <= cl->buf->file_last) {
|
|
156 size = aligned - cl->buf->file_pos;
|
|
157 }
|
|
158 }
|
|
159
|
22
|
160 file_size += (size_t) size;
|
0
|
161 send += size;
|
|
162 fprev = cl->buf->file_pos + size;
|
|
163 cl = cl->next;
|
|
164
|
|
165 } while (cl
|
|
166 && cl->buf->in_file
|
|
167 && send < limit
|
|
168 && file->file->fd == cl->buf->file->fd
|
|
169 && fprev == cl->buf->file_pos);
|
|
170 }
|
|
171
|
4
|
172
|
0
|
173 if (file) {
|
4
|
174
|
0
|
175 /* create the tailer iovec and coalesce the neighbouring bufs */
|
|
176
|
|
177 prev = NULL;
|
|
178 iov = NULL;
|
|
179
|
4
|
180 while (cl && header.nelts < IOV_MAX && send < limit) {
|
|
181
|
0
|
182 if (ngx_buf_special(cl->buf)) {
|
4
|
183 cl = cl->next;
|
0
|
184 continue;
|
|
185 }
|
|
186
|
|
187 if (!ngx_buf_in_memory_only(cl->buf)) {
|
|
188 break;
|
|
189 }
|
|
190
|
|
191 size = cl->buf->last - cl->buf->pos;
|
|
192
|
|
193 if (send + size > limit) {
|
|
194 size = limit - send;
|
|
195 }
|
|
196
|
|
197 if (prev == cl->buf->pos) {
|
22
|
198 iov->iov_len += (size_t) size;
|
0
|
199
|
|
200 } else {
|
50
|
201 iov = ngx_array_push(&trailer);
|
|
202 if (iov == NULL) {
|
0
|
203 return NGX_CHAIN_ERROR;
|
|
204 }
|
|
205
|
|
206 iov->iov_base = (void *) cl->buf->pos;
|
22
|
207 iov->iov_len = (size_t) size;
|
0
|
208 }
|
|
209
|
22
|
210 prev = cl->buf->pos + (size_t) size;
|
0
|
211 send += size;
|
4
|
212 cl = cl->next;
|
0
|
213 }
|
|
214 }
|
|
215
|
|
216 if (file) {
|
|
217
|
|
218 if (ngx_freebsd_use_tcp_nopush
|
|
219 && c->tcp_nopush == NGX_TCP_NOPUSH_UNSET)
|
|
220 {
|
|
221 if (ngx_tcp_nopush(c->fd) == NGX_ERROR) {
|
|
222 err = ngx_errno;
|
|
223
|
|
224 /*
|
28
|
225 * there is a tiny chance to be interrupted, however,
|
0
|
226 * we continue a processing without the TCP_NOPUSH
|
|
227 */
|
|
228
|
|
229 if (err != NGX_EINTR) {
|
|
230 wev->error = 1;
|
|
231 ngx_connection_error(c, err,
|
|
232 ngx_tcp_nopush_n " failed");
|
|
233 return NGX_CHAIN_ERROR;
|
|
234 }
|
|
235
|
|
236 } else {
|
|
237 c->tcp_nopush = NGX_TCP_NOPUSH_SET;
|
|
238
|
|
239 ngx_log_debug0(NGX_LOG_DEBUG_EVENT, c->log, 0,
|
|
240 "tcp_nopush");
|
|
241 }
|
|
242 }
|
|
243
|
|
244 hdtr.headers = (struct iovec *) header.elts;
|
|
245 hdtr.hdr_cnt = header.nelts;
|
|
246 hdtr.trailers = (struct iovec *) trailer.elts;
|
|
247 hdtr.trl_cnt = trailer.nelts;
|
|
248
|
|
249 /*
|
|
250 * the "nbytes bug" of the old sendfile() syscall:
|
|
251 * http://www.freebsd.org/cgi/query-pr.cgi?pr=33771
|
|
252 */
|
|
253
|
28
|
254 if (!ngx_freebsd_sendfile_nbytes_bug) {
|
22
|
255 header_size = 0;
|
0
|
256 }
|
|
257
|
|
258 sent = 0;
|
|
259
|
|
260 rc = sendfile(file->file->fd, c->fd, file->file_pos,
|
22
|
261 file_size + header_size, &hdtr, &sent, 0);
|
0
|
262
|
|
263 if (rc == -1) {
|
|
264 err = ngx_errno;
|
|
265
|
|
266 if (err == NGX_EAGAIN || err == NGX_EINTR) {
|
|
267 if (err == NGX_EINTR) {
|
|
268 eintr = 1;
|
|
269
|
|
270 } else {
|
|
271 eagain = 1;
|
|
272 }
|
|
273
|
|
274 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, err,
|
22
|
275 "sendfile() sent only %O bytes", sent);
|
0
|
276
|
|
277 } else {
|
|
278 wev->error = 1;
|
|
279 ngx_connection_error(c, err, "sendfile() failed");
|
|
280 return NGX_CHAIN_ERROR;
|
|
281 }
|
|
282 }
|
|
283
|
32
|
284 /*
|
|
285 * sendfile() in FreeBSD 3.x-4.x may return value >= 0
|
|
286 * on success, although only 0 is documented
|
|
287 */
|
|
288
|
|
289 if (rc >= 0 && sent == 0) {
|
4
|
290
|
|
291 /*
|
32
|
292 * if rc is OK and sent equal to zero, then someone
|
|
293 * has truncated the file, so the offset became beyond
|
|
294 * the end of the file
|
4
|
295 */
|
|
296
|
|
297 ngx_log_error(NGX_LOG_ALERT, c->log, 0,
|
|
298 "sendfile() reported that \"%s\" was truncated",
|
|
299 file->file->name.data);
|
|
300
|
|
301 return NGX_CHAIN_ERROR;
|
|
302 }
|
|
303
|
0
|
304 ngx_log_debug4(NGX_LOG_DEBUG_EVENT, c->log, 0,
|
10
|
305 "sendfile: %d, @%O %O:%uz",
|
22
|
306 rc, file->file_pos, sent, file_size + header_size);
|
0
|
307
|
|
308 } else {
|
|
309 rc = writev(c->fd, header.elts, header.nelts);
|
|
310
|
|
311 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, c->log, 0,
|
22
|
312 "writev: %d of %uz", rc, header_size);
|
0
|
313
|
|
314 if (rc == -1) {
|
|
315 err = ngx_errno;
|
|
316
|
|
317 if (err == NGX_EAGAIN || err == NGX_EINTR) {
|
|
318 if (err == NGX_EINTR) {
|
|
319 eintr = 1;
|
|
320 }
|
|
321
|
|
322 ngx_log_debug0(NGX_LOG_DEBUG_EVENT, c->log, err,
|
|
323 "writev() not ready");
|
|
324
|
|
325 } else {
|
|
326 wev->error = 1;
|
|
327 ngx_connection_error(c, err, "writev() failed");
|
|
328 return NGX_CHAIN_ERROR;
|
|
329 }
|
|
330 }
|
|
331
|
|
332 sent = rc > 0 ? rc : 0;
|
|
333 }
|
|
334
|
22
|
335 if (send - prev_send == sent) {
|
0
|
336 complete = 1;
|
|
337 }
|
|
338
|
|
339 c->sent += sent;
|
|
340
|
|
341 for (cl = in; cl; cl = cl->next) {
|
|
342
|
|
343 if (ngx_buf_special(cl->buf)) {
|
|
344 continue;
|
|
345 }
|
|
346
|
|
347 if (sent == 0) {
|
|
348 break;
|
|
349 }
|
|
350
|
|
351 size = ngx_buf_size(cl->buf);
|
|
352
|
|
353 if (sent >= size) {
|
|
354 sent -= size;
|
|
355
|
|
356 if (ngx_buf_in_memory(cl->buf)) {
|
|
357 cl->buf->pos = cl->buf->last;
|
|
358 }
|
|
359
|
|
360 if (cl->buf->in_file) {
|
|
361 cl->buf->file_pos = cl->buf->file_last;
|
|
362 }
|
|
363
|
|
364 continue;
|
|
365 }
|
|
366
|
|
367 if (ngx_buf_in_memory(cl->buf)) {
|
22
|
368 cl->buf->pos += (size_t) sent;
|
0
|
369 }
|
|
370
|
|
371 if (cl->buf->in_file) {
|
|
372 cl->buf->file_pos += sent;
|
|
373 }
|
|
374
|
|
375 break;
|
|
376 }
|
|
377
|
|
378 if (eagain) {
|
|
379
|
|
380 /*
|
28
|
381 * sendfile() may return EAGAIN, even if it has sent a whole file
|
|
382 * part, it indicates that the successive sendfile() call would
|
0
|
383 * return EAGAIN right away and would not send anything.
|
|
384 * We use it as a hint.
|
|
385 */
|
|
386
|
|
387 wev->ready = 0;
|
|
388 return cl;
|
|
389 }
|
|
390
|
|
391 if (eintr) {
|
|
392 continue;
|
|
393 }
|
|
394
|
|
395 if (!complete) {
|
|
396 wev->ready = 0;
|
|
397 return cl;
|
|
398 }
|
|
399
|
|
400 if (send >= limit || cl == NULL) {
|
|
401 return cl;
|
|
402 }
|
|
403
|
|
404 in = cl;
|
|
405 }
|
|
406 }
|