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comparison src/os/unix/ngx_darwin_sendfile_chain.c @ 390:0b6053502c55 NGINX_0_7_7

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nginx 0.7.7 *) Change: now the EAGAIN error returned by connect() is not considered as temporary error. *) Change: now the $ssl_client_cert variable value is a certificate with TAB character intended before each line except first one; an unchanged certificate is available in the $ssl_client_raw_cert variable. *) Feature: the "ask" parameter in the "ssl_verify_client" directive. *) Feature: byte-range processing improvements. Thanks to Maxim Dounin. *) Feature: the "directio" directive. *) Feature: MacOSX 1.5 sendfile() support. *) Bugfix: now in MacOSX and Cygwin locations are tested in case insensitive mode; however, the compare is provided by single-byte locales only. *) Bugfix: mail proxy SSL connections hanged, if select, poll, or /dev/poll methods were used. *) Bugfix: UTF-8 encoding usage in the ngx_http_autoindex_module.
author Igor Sysoev <http://sysoev.ru>
date Wed, 30 Jul 2008 00:00:00 +0400
parents
children d41628eb4d0a
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equal deleted inserted replaced
389:930e48a26dde 390:0b6053502c55
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 /*
13 * It seems that Darwin 9.4 (Mac OS X 1.5) sendfile() has the same
14 * old bug as early FreeBSD sendfile() syscall:
15 * http://www.freebsd.org/cgi/query-pr.cgi?pr=33771
16 *
17 * Besides sendfile() has another bug: if one calls sendfile()
18 * with both a header and a trailer, then sendfile() ignores a file part
19 * at all and sends only the header and the trailer together.
20 * For this reason we send a trailer only if there is no a header.
21 *
22 * Although sendfile() allows to pass a header or a trailer,
23 * it may send the header or the trailer and a part of the file
24 * in different packets. And FreeBSD workaround (TCP_NOPUSH option)
25 * does not help.
26 */
27
28
29 #if (IOV_MAX > 64)
30 #define NGX_HEADERS 64
31 #define NGX_TRAILERS 64
32 #else
33 #define NGX_HEADERS IOV_MAX
34 #define NGX_TRAILERS IOV_MAX
35 #endif
36
37
38 ngx_chain_t *
39 ngx_darwin_sendfile_chain(ngx_connection_t *c, ngx_chain_t *in, off_t limit)
40 {
41 int rc;
42 u_char *prev;
43 off_t size, send, prev_send, aligned, sent, fprev;
44 off_t header_size, file_size;
45 ngx_uint_t eintr, eagain, complete;
46 ngx_err_t err;
47 ngx_buf_t *file;
48 ngx_array_t header, trailer;
49 ngx_event_t *wev;
50 ngx_chain_t *cl;
51 struct sf_hdtr hdtr;
52 struct iovec *iov, headers[NGX_HEADERS], trailers[NGX_TRAILERS];
53
54 wev = c->write;
55
56 if (!wev->ready) {
57 return in;
58 }
59
60 #if (NGX_HAVE_KQUEUE)
61
62 if ((ngx_event_flags & NGX_USE_KQUEUE_EVENT) && wev->pending_eof) {
63 (void) ngx_connection_error(c, wev->kq_errno,
64 "kevent() reported about an closed connection");
65 wev->error = 1;
66 return NGX_CHAIN_ERROR;
67 }
68
69 #endif
70
71 /* the maximum limit size is the maximum size_t value - the page size */
72
73 if (limit == 0 || limit > (off_t) (NGX_MAX_SIZE_T_VALUE - ngx_pagesize)) {
74 limit = NGX_MAX_SIZE_T_VALUE - ngx_pagesize;
75 }
76
77 send = 0;
78 eagain = 0;
79
80 header.elts = headers;
81 header.size = sizeof(struct iovec);
82 header.nalloc = NGX_HEADERS;
83 header.pool = c->pool;
84
85 trailer.elts = trailers;
86 trailer.size = sizeof(struct iovec);
87 trailer.nalloc = NGX_TRAILERS;
88 trailer.pool = c->pool;
89
90 for ( ;; ) {
91 file = NULL;
92 file_size = 0;
93 header_size = 0;
94 eintr = 0;
95 complete = 0;
96 prev_send = send;
97
98 header.nelts = 0;
99 trailer.nelts = 0;
100
101 /* create the header iovec and coalesce the neighbouring bufs */
102
103 prev = NULL;
104 iov = NULL;
105
106 for (cl = in;
107 cl && header.nelts < IOV_MAX && send < limit;
108 cl = cl->next)
109 {
110 if (ngx_buf_special(cl->buf)) {
111 continue;
112 }
113
114 if (!ngx_buf_in_memory_only(cl->buf)) {
115 break;
116 }
117
118 size = cl->buf->last - cl->buf->pos;
119
120 if (send + size > limit) {
121 size = limit - send;
122 }
123
124 if (prev == cl->buf->pos) {
125 iov->iov_len += (size_t) size;
126
127 } else {
128 iov = ngx_array_push(&header);
129 if (iov == NULL) {
130 return NGX_CHAIN_ERROR;
131 }
132
133 iov->iov_base = (void *) cl->buf->pos;
134 iov->iov_len = (size_t) size;
135 }
136
137 prev = cl->buf->pos + (size_t) size;
138 header_size += size;
139 send += size;
140 }
141
142
143 if (cl && cl->buf->in_file && send < limit) {
144 file = cl->buf;
145
146 /* coalesce the neighbouring file bufs */
147
148 do {
149 size = cl->buf->file_last - cl->buf->file_pos;
150
151 if (send + size > limit) {
152 size = limit - send;
153
154 aligned = (cl->buf->file_pos + size + ngx_pagesize - 1)
155 & ~((off_t) ngx_pagesize - 1);
156
157 if (aligned <= cl->buf->file_last) {
158 size = aligned - cl->buf->file_pos;
159 }
160 }
161
162 file_size += size;
163 send += size;
164 fprev = cl->buf->file_pos + size;
165 cl = cl->next;
166
167 } while (cl
168 && cl->buf->in_file
169 && send < limit
170 && file->file->fd == cl->buf->file->fd
171 && fprev == cl->buf->file_pos);
172 }
173
174 if (file && header.nelts == 0) {
175
176 /* create the tailer iovec and coalesce the neighbouring bufs */
177
178 prev = NULL;
179 iov = NULL;
180
181 while (cl && header.nelts < IOV_MAX && send < limit) {
182
183 if (ngx_buf_special(cl->buf)) {
184 cl = cl->next;
185 continue;
186 }
187
188 if (!ngx_buf_in_memory_only(cl->buf)) {
189 break;
190 }
191
192 size = cl->buf->last - cl->buf->pos;
193
194 if (send + size > limit) {
195 size = limit - send;
196 }
197
198 if (prev == cl->buf->pos) {
199 iov->iov_len += (size_t) size;
200
201 } else {
202 iov = ngx_array_push(&trailer);
203 if (iov == NULL) {
204 return NGX_CHAIN_ERROR;
205 }
206
207 iov->iov_base = (void *) cl->buf->pos;
208 iov->iov_len = (size_t) size;
209 }
210
211 prev = cl->buf->pos + (size_t) size;
212 send += size;
213 cl = cl->next;
214 }
215 }
216
217 if (file) {
218
219 /*
220 * sendfile() returns EINVAL if sf_hdtr's count is 0,
221 * but corresponding pointer is not NULL
222 */
223
224 hdtr.headers = header.nelts ? (struct iovec *) header.elts: NULL;
225 hdtr.hdr_cnt = header.nelts;
226 hdtr.trailers = trailer.nelts ? (struct iovec *) trailer.elts: NULL;
227 hdtr.trl_cnt = trailer.nelts;
228
229 sent = header_size + file_size;
230
231 ngx_log_debug3(NGX_LOG_DEBUG_EVENT, c->log, 0,
232 "sendfile: @%O %O h:%O",
233 file->file_pos, sent, header_size);
234
235 rc = sendfile(file->file->fd, c->fd, file->file_pos,
236 &sent, &hdtr, 0);
237
238 if (rc == -1) {
239 err = ngx_errno;
240
241 if (err == NGX_EAGAIN || err == NGX_EINTR) {
242 if (err == NGX_EINTR) {
243 eintr = 1;
244
245 } else {
246 eagain = 1;
247 }
248
249 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, err,
250 "sendfile() sent only %O bytes", sent);
251
252 } else {
253 wev->error = 1;
254 (void) ngx_connection_error(c, err, "sendfile() failed");
255 return NGX_CHAIN_ERROR;
256 }
257 }
258
259 if (rc == 0 && sent == 0) {
260
261 /*
262 * if rc and sent equal to zero, then someone
263 * has truncated the file, so the offset became beyond
264 * the end of the file
265 */
266
267 ngx_log_error(NGX_LOG_ALERT, c->log, 0,
268 "sendfile() reported that \"%s\" was truncated",
269 file->file->name.data);
270
271 return NGX_CHAIN_ERROR;
272 }
273
274 ngx_log_debug4(NGX_LOG_DEBUG_EVENT, c->log, 0,
275 "sendfile: %d, @%O %O:%O",
276 rc, file->file_pos, sent, file_size + header_size);
277
278 } else {
279 rc = writev(c->fd, header.elts, header.nelts);
280
281 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, c->log, 0,
282 "writev: %d of %uz", rc, send);
283
284 if (rc == -1) {
285 err = ngx_errno;
286
287 if (err == NGX_EAGAIN || err == NGX_EINTR) {
288 if (err == NGX_EINTR) {
289 eintr = 1;
290 }
291
292 ngx_log_debug0(NGX_LOG_DEBUG_EVENT, c->log, err,
293 "writev() not ready");
294
295 } else {
296 wev->error = 1;
297 ngx_connection_error(c, err, "writev() failed");
298 return NGX_CHAIN_ERROR;
299 }
300 }
301
302 sent = rc > 0 ? rc : 0;
303 }
304
305 if (send - prev_send == sent) {
306 complete = 1;
307 }
308
309 c->sent += sent;
310
311 for (cl = in; cl; cl = cl->next) {
312
313 if (ngx_buf_special(cl->buf)) {
314 continue;
315 }
316
317 if (sent == 0) {
318 break;
319 }
320
321 size = ngx_buf_size(cl->buf);
322
323 if (sent >= size) {
324 sent -= size;
325
326 if (ngx_buf_in_memory(cl->buf)) {
327 cl->buf->pos = cl->buf->last;
328 }
329
330 if (cl->buf->in_file) {
331 cl->buf->file_pos = cl->buf->file_last;
332 }
333
334 continue;
335 }
336
337 if (ngx_buf_in_memory(cl->buf)) {
338 cl->buf->pos += (size_t) sent;
339 }
340
341 if (cl->buf->in_file) {
342 cl->buf->file_pos += sent;
343 }
344
345 break;
346 }
347
348 if (eintr) {
349 continue;
350 }
351
352 if (!complete) {
353 wev->ready = 0;
354 return cl;
355 }
356
357 if (send >= limit || cl == NULL) {
358 return cl;
359 }
360
361 in = cl;
362 }
363 }