Mercurial > hg > nginx
annotate src/os/unix/ngx_linux_sendfile_chain.c @ 5913:8e903522c17a
Introduced the ngx_output_chain_to_iovec() function.
It deduplicates code of the send chain functions and uses only preallocated
memory, which completely solves the problem mentioned in d1bde5c3c5d2.
author | Valentin Bartenev <vbart@nginx.com> |
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date | Tue, 07 Oct 2014 11:38:57 +0400 |
parents | de68ed551bfb |
children | ac3f78219f85 |
rev | line source |
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1 |
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2 /* |
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3 * Copyright (C) Igor Sysoev |
4412 | 4 * Copyright (C) Nginx, Inc. |
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5 */ |
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8 #include <ngx_config.h> |
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9 #include <ngx_core.h> |
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10 #include <ngx_event.h> |
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11 |
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13 /* |
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14 * On Linux up to 2.4.21 sendfile() (syscall #187) works with 32-bit |
479 | 15 * offsets only, and the including <sys/sendfile.h> breaks the compiling, |
16 * if off_t is 64 bit wide. So we use own sendfile() definition, where offset | |
17 * parameter is int32_t, and use sendfile() for the file parts below 2G only, | |
18 * see src/os/unix/ngx_linux_config.h | |
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19 * |
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20 * Linux 2.4.21 has the new sendfile64() syscall #239. |
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21 * |
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22 * On Linux up to 2.6.16 sendfile() does not allow to pass the count parameter |
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23 * more than 2G-1 bytes even on 64-bit platforms: it returns EINVAL, |
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24 * so we limit it to 2G-1 bytes. |
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25 */ |
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26 |
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27 #define NGX_SENDFILE_MAXSIZE 2147483647L |
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29 |
585 | 30 ngx_chain_t * |
31 ngx_linux_sendfile_chain(ngx_connection_t *c, ngx_chain_t *in, off_t limit) | |
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32 { |
589 | 33 int rc, tcp_nodelay; |
34 off_t size, send, prev_send, aligned, sent, fprev; | |
35 size_t file_size; | |
36 ngx_err_t err; | |
37 ngx_buf_t *file; | |
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38 ngx_uint_t eintr; |
589 | 39 ngx_event_t *wev; |
40 ngx_chain_t *cl; | |
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41 ngx_iovec_t header; |
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42 struct iovec headers[NGX_IOVS_PREALLOCATE]; |
455 | 43 #if (NGX_HAVE_SENDFILE64) |
589 | 44 off_t offset; |
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45 #else |
589 | 46 int32_t offset; |
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47 #endif |
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48 |
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49 wev = c->write; |
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51 if (!wev->ready) { |
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52 return in; |
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53 } |
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54 |
473 | 55 |
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56 /* the maximum limit size is 2G-1 - the page size */ |
473 | 57 |
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58 if (limit == 0 || limit > (off_t) (NGX_SENDFILE_MAXSIZE - ngx_pagesize)) { |
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59 limit = NGX_SENDFILE_MAXSIZE - ngx_pagesize; |
473 | 60 } |
61 | |
62 | |
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63 send = 0; |
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64 |
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65 header.iovs = headers; |
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66 header.nalloc = NGX_IOVS_PREALLOCATE; |
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67 |
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68 for ( ;; ) { |
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69 file = NULL; |
473 | 70 file_size = 0; |
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71 eintr = 0; |
473 | 72 prev_send = send; |
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73 |
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74 /* create the iovec and coalesce the neighbouring bufs */ |
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75 |
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76 cl = ngx_output_chain_to_iovec(&header, in, limit - send, c->log); |
479 | 77 |
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78 if (cl == NGX_CHAIN_ERROR) { |
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79 return NGX_CHAIN_ERROR; |
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80 } |
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81 |
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82 send += header.size; |
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83 |
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84 /* set TCP_CORK if there is a header before a file */ |
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85 |
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86 if (c->tcp_nopush == NGX_TCP_NOPUSH_UNSET |
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87 && header.count != 0 |
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88 && cl |
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89 && cl->buf->in_file) |
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90 { |
473 | 91 /* the TCP_CORK and TCP_NODELAY are mutually exclusive */ |
92 | |
483 | 93 if (c->tcp_nodelay == NGX_TCP_NODELAY_SET) { |
473 | 94 |
95 tcp_nodelay = 0; | |
96 | |
97 if (setsockopt(c->fd, IPPROTO_TCP, TCP_NODELAY, | |
98 (const void *) &tcp_nodelay, sizeof(int)) == -1) | |
99 { | |
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100 err = ngx_socket_errno; |
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101 |
473 | 102 /* |
479 | 103 * there is a tiny chance to be interrupted, however, |
473 | 104 * we continue a processing with the TCP_NODELAY |
105 * and without the TCP_CORK | |
106 */ | |
107 | |
577 | 108 if (err != NGX_EINTR) { |
473 | 109 wev->error = 1; |
483 | 110 ngx_connection_error(c, err, |
473 | 111 "setsockopt(TCP_NODELAY) failed"); |
112 return NGX_CHAIN_ERROR; | |
113 } | |
114 | |
115 } else { | |
483 | 116 c->tcp_nodelay = NGX_TCP_NODELAY_UNSET; |
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117 |
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118 ngx_log_debug0(NGX_LOG_DEBUG_EVENT, c->log, 0, |
473 | 119 "no tcp_nodelay"); |
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120 } |
473 | 121 } |
122 | |
483 | 123 if (c->tcp_nodelay == NGX_TCP_NODELAY_UNSET) { |
473 | 124 |
125 if (ngx_tcp_nopush(c->fd) == NGX_ERROR) { | |
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126 err = ngx_socket_errno; |
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127 |
473 | 128 /* |
479 | 129 * there is a tiny chance to be interrupted, however, |
473 | 130 * we continue a processing without the TCP_CORK |
131 */ | |
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132 |
577 | 133 if (err != NGX_EINTR) { |
473 | 134 wev->error = 1; |
135 ngx_connection_error(c, err, | |
136 ngx_tcp_nopush_n " failed"); | |
137 return NGX_CHAIN_ERROR; | |
138 } | |
139 | |
140 } else { | |
141 c->tcp_nopush = NGX_TCP_NOPUSH_SET; | |
577 | 142 |
473 | 143 ngx_log_debug0(NGX_LOG_DEBUG_EVENT, c->log, 0, |
144 "tcp_nopush"); | |
145 } | |
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146 } |
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147 } |
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148 |
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149 /* get the file buf */ |
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150 |
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151 if (header.count == 0 && cl && cl->buf->in_file && send < limit) { |
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152 file = cl->buf; |
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153 |
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154 /* coalesce the neighbouring file bufs */ |
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155 |
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156 do { |
473 | 157 size = cl->buf->file_last - cl->buf->file_pos; |
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158 |
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159 if (send + size > limit) { |
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160 size = limit - send; |
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161 |
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162 aligned = (cl->buf->file_pos + size + ngx_pagesize - 1) |
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163 & ~((off_t) ngx_pagesize - 1); |
362
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nginx-0.0.7-2004-06-21-19:59:32 import
Igor Sysoev <igor@sysoev.ru>
parents:
344
diff
changeset
|
164 |
7650aea1816f
nginx-0.0.7-2004-06-21-19:59:32 import
Igor Sysoev <igor@sysoev.ru>
parents:
344
diff
changeset
|
165 if (aligned <= cl->buf->file_last) { |
7650aea1816f
nginx-0.0.7-2004-06-21-19:59:32 import
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parents:
344
diff
changeset
|
166 size = aligned - cl->buf->file_pos; |
7650aea1816f
nginx-0.0.7-2004-06-21-19:59:32 import
Igor Sysoev <igor@sysoev.ru>
parents:
344
diff
changeset
|
167 } |
195
8dee38ea9117
nginx-0.0.1-2003-11-25-23:44:56 import
Igor Sysoev <igor@sysoev.ru>
parents:
97
diff
changeset
|
168 } |
97
70d2345a903f
nginx-0.0.1-2003-05-29-17:02:09 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
169 |
473 | 170 file_size += (size_t) size; |
362
7650aea1816f
nginx-0.0.7-2004-06-21-19:59:32 import
Igor Sysoev <igor@sysoev.ru>
parents:
344
diff
changeset
|
171 send += size; |
7650aea1816f
nginx-0.0.7-2004-06-21-19:59:32 import
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parents:
344
diff
changeset
|
172 fprev = cl->buf->file_pos + size; |
195
8dee38ea9117
nginx-0.0.1-2003-11-25-23:44:56 import
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parents:
97
diff
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|
173 cl = cl->next; |
362
7650aea1816f
nginx-0.0.7-2004-06-21-19:59:32 import
Igor Sysoev <igor@sysoev.ru>
parents:
344
diff
changeset
|
174 |
7650aea1816f
nginx-0.0.7-2004-06-21-19:59:32 import
Igor Sysoev <igor@sysoev.ru>
parents:
344
diff
changeset
|
175 } while (cl |
7650aea1816f
nginx-0.0.7-2004-06-21-19:59:32 import
Igor Sysoev <igor@sysoev.ru>
parents:
344
diff
changeset
|
176 && cl->buf->in_file |
7650aea1816f
nginx-0.0.7-2004-06-21-19:59:32 import
Igor Sysoev <igor@sysoev.ru>
parents:
344
diff
changeset
|
177 && send < limit |
7650aea1816f
nginx-0.0.7-2004-06-21-19:59:32 import
Igor Sysoev <igor@sysoev.ru>
parents:
344
diff
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178 && file->file->fd == cl->buf->file->fd |
7650aea1816f
nginx-0.0.7-2004-06-21-19:59:32 import
Igor Sysoev <igor@sysoev.ru>
parents:
344
diff
changeset
|
179 && fprev == cl->buf->file_pos); |
97
70d2345a903f
nginx-0.0.1-2003-05-29-17:02:09 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
180 } |
70d2345a903f
nginx-0.0.1-2003-05-29-17:02:09 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
181 |
362
7650aea1816f
nginx-0.0.7-2004-06-21-19:59:32 import
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parents:
344
diff
changeset
|
182 if (file) { |
589 | 183 #if 1 |
184 if (file_size == 0) { | |
185 ngx_debug_point(); | |
186 return NGX_CHAIN_ERROR; | |
187 } | |
188 #endif | |
455 | 189 #if (NGX_HAVE_SENDFILE64) |
196
11fbd0fc041d
nginx-0.0.1-2003-11-26-18:42:18 import
Igor Sysoev <igor@sysoev.ru>
parents:
195
diff
changeset
|
190 offset = file->file_pos; |
198
34995c5ec6c4
nginx-0.0.1-2003-11-27-22:01:37 import
Igor Sysoev <igor@sysoev.ru>
parents:
196
diff
changeset
|
191 #else |
34995c5ec6c4
nginx-0.0.1-2003-11-27-22:01:37 import
Igor Sysoev <igor@sysoev.ru>
parents:
196
diff
changeset
|
192 offset = (int32_t) file->file_pos; |
34995c5ec6c4
nginx-0.0.1-2003-11-27-22:01:37 import
Igor Sysoev <igor@sysoev.ru>
parents:
196
diff
changeset
|
193 #endif |
1198 | 194 |
195 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, c->log, 0, | |
196 "sendfile: @%O %uz", file->file_pos, file_size); | |
197 | |
473 | 198 rc = sendfile(c->fd, file->file->fd, &offset, file_size); |
195
8dee38ea9117
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Igor Sysoev <igor@sysoev.ru>
parents:
97
diff
changeset
|
199 |
8dee38ea9117
nginx-0.0.1-2003-11-25-23:44:56 import
Igor Sysoev <igor@sysoev.ru>
parents:
97
diff
changeset
|
200 if (rc == -1) { |
8dee38ea9117
nginx-0.0.1-2003-11-25-23:44:56 import
Igor Sysoev <igor@sysoev.ru>
parents:
97
diff
changeset
|
201 err = ngx_errno; |
8dee38ea9117
nginx-0.0.1-2003-11-25-23:44:56 import
Igor Sysoev <igor@sysoev.ru>
parents:
97
diff
changeset
|
202 |
3063
6f6d7ea70805
refactor EAGAIN/EINTR processing
Igor Sysoev <igor@sysoev.ru>
parents:
1354
diff
changeset
|
203 switch (err) { |
6f6d7ea70805
refactor EAGAIN/EINTR processing
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parents:
1354
diff
changeset
|
204 case NGX_EAGAIN: |
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refactor EAGAIN/EINTR processing
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parents:
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diff
changeset
|
205 break; |
253
b6793bc5034b
nginx-0.0.2-2004-02-09-10:46:43 import
Igor Sysoev <igor@sysoev.ru>
parents:
247
diff
changeset
|
206 |
3063
6f6d7ea70805
refactor EAGAIN/EINTR processing
Igor Sysoev <igor@sysoev.ru>
parents:
1354
diff
changeset
|
207 case NGX_EINTR: |
6f6d7ea70805
refactor EAGAIN/EINTR processing
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parents:
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diff
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|
208 eintr = 1; |
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diff
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|
209 break; |
195
8dee38ea9117
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Igor Sysoev <igor@sysoev.ru>
parents:
97
diff
changeset
|
210 |
3063
6f6d7ea70805
refactor EAGAIN/EINTR processing
Igor Sysoev <igor@sysoev.ru>
parents:
1354
diff
changeset
|
211 default: |
253
b6793bc5034b
nginx-0.0.2-2004-02-09-10:46:43 import
Igor Sysoev <igor@sysoev.ru>
parents:
247
diff
changeset
|
212 wev->error = 1; |
b6793bc5034b
nginx-0.0.2-2004-02-09-10:46:43 import
Igor Sysoev <igor@sysoev.ru>
parents:
247
diff
changeset
|
213 ngx_connection_error(c, err, "sendfile() failed"); |
195
8dee38ea9117
nginx-0.0.1-2003-11-25-23:44:56 import
Igor Sysoev <igor@sysoev.ru>
parents:
97
diff
changeset
|
214 return NGX_CHAIN_ERROR; |
8dee38ea9117
nginx-0.0.1-2003-11-25-23:44:56 import
Igor Sysoev <igor@sysoev.ru>
parents:
97
diff
changeset
|
215 } |
3063
6f6d7ea70805
refactor EAGAIN/EINTR processing
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parents:
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diff
changeset
|
216 |
6f6d7ea70805
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diff
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|
217 ngx_log_debug0(NGX_LOG_DEBUG_EVENT, c->log, err, |
6f6d7ea70805
refactor EAGAIN/EINTR processing
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parents:
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diff
changeset
|
218 "sendfile() is not ready"); |
195
8dee38ea9117
nginx-0.0.1-2003-11-25-23:44:56 import
Igor Sysoev <igor@sysoev.ru>
parents:
97
diff
changeset
|
219 } |
8dee38ea9117
nginx-0.0.1-2003-11-25-23:44:56 import
Igor Sysoev <igor@sysoev.ru>
parents:
97
diff
changeset
|
220 |
8dee38ea9117
nginx-0.0.1-2003-11-25-23:44:56 import
Igor Sysoev <igor@sysoev.ru>
parents:
97
diff
changeset
|
221 sent = rc > 0 ? rc : 0; |
97
70d2345a903f
nginx-0.0.1-2003-05-29-17:02:09 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
222 |
253
b6793bc5034b
nginx-0.0.2-2004-02-09-10:46:43 import
Igor Sysoev <igor@sysoev.ru>
parents:
247
diff
changeset
|
223 ngx_log_debug4(NGX_LOG_DEBUG_EVENT, c->log, 0, |
473 | 224 "sendfile: %d, @%O %O:%uz", |
225 rc, file->file_pos, sent, file_size); | |
253
b6793bc5034b
nginx-0.0.2-2004-02-09-10:46:43 import
Igor Sysoev <igor@sysoev.ru>
parents:
247
diff
changeset
|
226 |
195
8dee38ea9117
nginx-0.0.1-2003-11-25-23:44:56 import
Igor Sysoev <igor@sysoev.ru>
parents:
97
diff
changeset
|
227 } else { |
5913
8e903522c17a
Introduced the ngx_output_chain_to_iovec() function.
Valentin Bartenev <vbart@nginx.com>
parents:
5912
diff
changeset
|
228 rc = writev(c->fd, header.iovs, header.count); |
97
70d2345a903f
nginx-0.0.1-2003-05-29-17:02:09 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
229 |
195
8dee38ea9117
nginx-0.0.1-2003-11-25-23:44:56 import
Igor Sysoev <igor@sysoev.ru>
parents:
97
diff
changeset
|
230 if (rc == -1) { |
8dee38ea9117
nginx-0.0.1-2003-11-25-23:44:56 import
Igor Sysoev <igor@sysoev.ru>
parents:
97
diff
changeset
|
231 err = ngx_errno; |
97
70d2345a903f
nginx-0.0.1-2003-05-29-17:02:09 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
232 |
3063
6f6d7ea70805
refactor EAGAIN/EINTR processing
Igor Sysoev <igor@sysoev.ru>
parents:
1354
diff
changeset
|
233 switch (err) { |
6f6d7ea70805
refactor EAGAIN/EINTR processing
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parents:
1354
diff
changeset
|
234 case NGX_EAGAIN: |
6f6d7ea70805
refactor EAGAIN/EINTR processing
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parents:
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diff
changeset
|
235 break; |
253
b6793bc5034b
nginx-0.0.2-2004-02-09-10:46:43 import
Igor Sysoev <igor@sysoev.ru>
parents:
247
diff
changeset
|
236 |
3063
6f6d7ea70805
refactor EAGAIN/EINTR processing
Igor Sysoev <igor@sysoev.ru>
parents:
1354
diff
changeset
|
237 case NGX_EINTR: |
6f6d7ea70805
refactor EAGAIN/EINTR processing
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parents:
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diff
changeset
|
238 eintr = 1; |
6f6d7ea70805
refactor EAGAIN/EINTR processing
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parents:
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diff
changeset
|
239 break; |
97
70d2345a903f
nginx-0.0.1-2003-05-29-17:02:09 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
240 |
3063
6f6d7ea70805
refactor EAGAIN/EINTR processing
Igor Sysoev <igor@sysoev.ru>
parents:
1354
diff
changeset
|
241 default: |
253
b6793bc5034b
nginx-0.0.2-2004-02-09-10:46:43 import
Igor Sysoev <igor@sysoev.ru>
parents:
247
diff
changeset
|
242 wev->error = 1; |
b6793bc5034b
nginx-0.0.2-2004-02-09-10:46:43 import
Igor Sysoev <igor@sysoev.ru>
parents:
247
diff
changeset
|
243 ngx_connection_error(c, err, "writev() failed"); |
577 | 244 return NGX_CHAIN_ERROR; |
195
8dee38ea9117
nginx-0.0.1-2003-11-25-23:44:56 import
Igor Sysoev <igor@sysoev.ru>
parents:
97
diff
changeset
|
245 } |
3063
6f6d7ea70805
refactor EAGAIN/EINTR processing
Igor Sysoev <igor@sysoev.ru>
parents:
1354
diff
changeset
|
246 |
6f6d7ea70805
refactor EAGAIN/EINTR processing
Igor Sysoev <igor@sysoev.ru>
parents:
1354
diff
changeset
|
247 ngx_log_debug0(NGX_LOG_DEBUG_EVENT, c->log, err, |
6f6d7ea70805
refactor EAGAIN/EINTR processing
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parents:
1354
diff
changeset
|
248 "writev() not ready"); |
97
70d2345a903f
nginx-0.0.1-2003-05-29-17:02:09 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
249 } |
70d2345a903f
nginx-0.0.1-2003-05-29-17:02:09 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
250 |
195
8dee38ea9117
nginx-0.0.1-2003-11-25-23:44:56 import
Igor Sysoev <igor@sysoev.ru>
parents:
97
diff
changeset
|
251 sent = rc > 0 ? rc : 0; |
97
70d2345a903f
nginx-0.0.1-2003-05-29-17:02:09 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
252 |
473 | 253 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, 0, "writev: %O", sent); |
97
70d2345a903f
nginx-0.0.1-2003-05-29-17:02:09 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
254 } |
70d2345a903f
nginx-0.0.1-2003-05-29-17:02:09 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
255 |
195
8dee38ea9117
nginx-0.0.1-2003-11-25-23:44:56 import
Igor Sysoev <igor@sysoev.ru>
parents:
97
diff
changeset
|
256 c->sent += sent; |
8dee38ea9117
nginx-0.0.1-2003-11-25-23:44:56 import
Igor Sysoev <igor@sysoev.ru>
parents:
97
diff
changeset
|
257 |
5912
de68ed551bfb
Renamed ngx_handle_sent_chain() to ngx_chain_update_sent().
Valentin Bartenev <vbart@nginx.com>
parents:
5868
diff
changeset
|
258 in = ngx_chain_update_sent(in, sent); |
97
70d2345a903f
nginx-0.0.1-2003-05-29-17:02:09 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
259 |
362
7650aea1816f
nginx-0.0.7-2004-06-21-19:59:32 import
Igor Sysoev <igor@sysoev.ru>
parents:
344
diff
changeset
|
260 if (eintr) { |
5868
6bbad2e73245
Fixed counting of sent bytes in the send chain functions on EINTR.
Valentin Bartenev <vbart@nginx.com>
parents:
5854
diff
changeset
|
261 send = prev_send; |
577 | 262 continue; |
362
7650aea1816f
nginx-0.0.7-2004-06-21-19:59:32 import
Igor Sysoev <igor@sysoev.ru>
parents:
344
diff
changeset
|
263 } |
195
8dee38ea9117
nginx-0.0.1-2003-11-25-23:44:56 import
Igor Sysoev <igor@sysoev.ru>
parents:
97
diff
changeset
|
264 |
5851
150df089fe47
Removed the "complete" variable from various send chain functions.
Valentin Bartenev <vbart@nginx.com>
parents:
5850
diff
changeset
|
265 if (send - prev_send != sent) { |
362
7650aea1816f
nginx-0.0.7-2004-06-21-19:59:32 import
Igor Sysoev <igor@sysoev.ru>
parents:
344
diff
changeset
|
266 wev->ready = 0; |
5320
ad137a80919f
Don't lose pointer to first nonempty buf in ngx_*_sendfile_chain().
Gleb Smirnoff <glebius@nginx.com>
parents:
5222
diff
changeset
|
267 return in; |
362
7650aea1816f
nginx-0.0.7-2004-06-21-19:59:32 import
Igor Sysoev <igor@sysoev.ru>
parents:
344
diff
changeset
|
268 } |
7650aea1816f
nginx-0.0.7-2004-06-21-19:59:32 import
Igor Sysoev <igor@sysoev.ru>
parents:
344
diff
changeset
|
269 |
5320
ad137a80919f
Don't lose pointer to first nonempty buf in ngx_*_sendfile_chain().
Gleb Smirnoff <glebius@nginx.com>
parents:
5222
diff
changeset
|
270 if (send >= limit || in == NULL) { |
ad137a80919f
Don't lose pointer to first nonempty buf in ngx_*_sendfile_chain().
Gleb Smirnoff <glebius@nginx.com>
parents:
5222
diff
changeset
|
271 return in; |
362
7650aea1816f
nginx-0.0.7-2004-06-21-19:59:32 import
Igor Sysoev <igor@sysoev.ru>
parents:
344
diff
changeset
|
272 } |
97
70d2345a903f
nginx-0.0.1-2003-05-29-17:02:09 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
273 } |
70d2345a903f
nginx-0.0.1-2003-05-29-17:02:09 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
274 } |