Mercurial > hg > nginx
annotate src/os/unix/ngx_linux_sendfile_chain.c @ 3892:12d8d2f30205
use MurmurHash2 for split_clients, because
its distribution is much better than CRC32's one
author | Igor Sysoev <igor@sysoev.ru> |
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date | Fri, 15 Apr 2011 10:59:57 +0000 |
parents | 6f6d7ea70805 |
children | d620f497c50f |
rev | line source |
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1 |
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2 /* |
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3 * Copyright (C) Igor Sysoev |
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4 */ |
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5 |
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7 #include <ngx_config.h> |
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8 #include <ngx_core.h> |
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9 #include <ngx_event.h> |
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11 |
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12 /* |
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13 * On Linux up to 2.4.21 sendfile() (syscall #187) works with 32-bit |
479 | 14 * offsets only, and the including <sys/sendfile.h> breaks the compiling, |
15 * if off_t is 64 bit wide. So we use own sendfile() definition, where offset | |
16 * parameter is int32_t, and use sendfile() for the file parts below 2G only, | |
17 * see src/os/unix/ngx_linux_config.h | |
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18 * |
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19 * Linux 2.4.21 has the new sendfile64() syscall #239. |
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20 * |
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21 * On Linux up to 2.6.16 sendfile() does not allow to pass the count parameter |
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22 * more than 2G-1 bytes even on 64-bit platforms: it returns EINVAL, |
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23 * so we limit it to 2G-1 bytes. |
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24 */ |
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25 |
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26 #define NGX_SENDFILE_LIMIT 2147483647L |
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27 |
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28 |
597 | 29 #if (IOV_MAX > 64) |
30 #define NGX_HEADERS 64 | |
31 #else | |
32 #define NGX_HEADERS IOV_MAX | |
33 #endif | |
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34 |
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35 |
585 | 36 ngx_chain_t * |
37 ngx_linux_sendfile_chain(ngx_connection_t *c, ngx_chain_t *in, off_t limit) | |
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38 { |
589 | 39 int rc, tcp_nodelay; |
40 off_t size, send, prev_send, aligned, sent, fprev; | |
41 u_char *prev; | |
42 size_t file_size; | |
43 ngx_err_t err; | |
44 ngx_buf_t *file; | |
45 ngx_uint_t eintr, complete; | |
46 ngx_array_t header; | |
47 ngx_event_t *wev; | |
48 ngx_chain_t *cl; | |
49 struct iovec *iov, headers[NGX_HEADERS]; | |
455 | 50 #if (NGX_HAVE_SENDFILE64) |
589 | 51 off_t offset; |
198
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52 #else |
589 | 53 int32_t offset; |
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54 #endif |
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55 |
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56 wev = c->write; |
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57 |
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58 if (!wev->ready) { |
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59 return in; |
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60 } |
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61 |
473 | 62 |
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63 /* the maximum limit size is 2G-1 - the page size */ |
473 | 64 |
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65 if (limit == 0 || limit > (off_t) (NGX_SENDFILE_LIMIT - ngx_pagesize)) { |
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66 limit = NGX_SENDFILE_LIMIT - ngx_pagesize; |
473 | 67 } |
68 | |
69 | |
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70 send = 0; |
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71 |
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72 header.elts = headers; |
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73 header.size = sizeof(struct iovec); |
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74 header.nalloc = NGX_HEADERS; |
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75 header.pool = c->pool; |
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76 |
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77 for ( ;; ) { |
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78 file = NULL; |
473 | 79 file_size = 0; |
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80 eintr = 0; |
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81 complete = 0; |
473 | 82 prev_send = send; |
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83 |
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84 header.nelts = 0; |
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85 |
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86 prev = NULL; |
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87 iov = NULL; |
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88 |
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89 /* create the iovec and coalesce the neighbouring bufs */ |
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90 |
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91 for (cl = in; |
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92 cl && header.nelts < IOV_MAX && send < limit; |
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93 cl = cl->next) |
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94 { |
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95 if (ngx_buf_special(cl->buf)) { |
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96 continue; |
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97 } |
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98 |
479 | 99 #if 1 |
100 if (!ngx_buf_in_memory(cl->buf) && !cl->buf->in_file) { | |
101 ngx_log_error(NGX_LOG_ALERT, c->log, 0, | |
483 | 102 "zero size buf in sendfile " |
103 "t:%d r:%d f:%d %p %p-%p %p %O-%O", | |
104 cl->buf->temporary, | |
105 cl->buf->recycled, | |
106 cl->buf->in_file, | |
107 cl->buf->start, | |
108 cl->buf->pos, | |
109 cl->buf->last, | |
110 cl->buf->file, | |
111 cl->buf->file_pos, | |
112 cl->buf->file_last); | |
113 | |
479 | 114 ngx_debug_point(); |
489 | 115 |
116 return NGX_CHAIN_ERROR; | |
479 | 117 } |
118 #endif | |
119 | |
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120 if (!ngx_buf_in_memory_only(cl->buf)) { |
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121 break; |
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122 } |
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123 |
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124 size = cl->buf->last - cl->buf->pos; |
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125 |
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126 if (send + size > limit) { |
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127 size = limit - send; |
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128 } |
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129 |
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130 if (prev == cl->buf->pos) { |
473 | 131 iov->iov_len += (size_t) size; |
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132 |
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133 } else { |
501 | 134 iov = ngx_array_push(&header); |
135 if (iov == NULL) { | |
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136 return NGX_CHAIN_ERROR; |
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137 } |
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138 |
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139 iov->iov_base = (void *) cl->buf->pos; |
473 | 140 iov->iov_len = (size_t) size; |
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141 } |
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142 |
473 | 143 prev = cl->buf->pos + (size_t) size; |
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144 send += size; |
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145 } |
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146 |
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147 /* set TCP_CORK if there is a header before a file */ |
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148 |
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149 if (c->tcp_nopush == NGX_TCP_NOPUSH_UNSET |
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150 && header.nelts != 0 |
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151 && cl |
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152 && cl->buf->in_file) |
195
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153 { |
473 | 154 /* the TCP_CORK and TCP_NODELAY are mutually exclusive */ |
155 | |
483 | 156 if (c->tcp_nodelay == NGX_TCP_NODELAY_SET) { |
473 | 157 |
158 tcp_nodelay = 0; | |
159 | |
160 if (setsockopt(c->fd, IPPROTO_TCP, TCP_NODELAY, | |
161 (const void *) &tcp_nodelay, sizeof(int)) == -1) | |
162 { | |
163 err = ngx_errno; | |
97
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164 |
473 | 165 /* |
479 | 166 * there is a tiny chance to be interrupted, however, |
473 | 167 * we continue a processing with the TCP_NODELAY |
168 * and without the TCP_CORK | |
169 */ | |
170 | |
577 | 171 if (err != NGX_EINTR) { |
473 | 172 wev->error = 1; |
483 | 173 ngx_connection_error(c, err, |
473 | 174 "setsockopt(TCP_NODELAY) failed"); |
175 return NGX_CHAIN_ERROR; | |
176 } | |
177 | |
178 } else { | |
483 | 179 c->tcp_nodelay = NGX_TCP_NODELAY_UNSET; |
97
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180 |
473 | 181 ngx_log_debug0(NGX_LOG_DEBUG_HTTP, c->log, 0, |
182 "no tcp_nodelay"); | |
253
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247
diff
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183 } |
473 | 184 } |
185 | |
483 | 186 if (c->tcp_nodelay == NGX_TCP_NODELAY_UNSET) { |
473 | 187 |
188 if (ngx_tcp_nopush(c->fd) == NGX_ERROR) { | |
189 err = ngx_errno; | |
253
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diff
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190 |
473 | 191 /* |
479 | 192 * there is a tiny chance to be interrupted, however, |
473 | 193 * we continue a processing without the TCP_CORK |
194 */ | |
344
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195 |
577 | 196 if (err != NGX_EINTR) { |
473 | 197 wev->error = 1; |
198 ngx_connection_error(c, err, | |
199 ngx_tcp_nopush_n " failed"); | |
200 return NGX_CHAIN_ERROR; | |
201 } | |
202 | |
203 } else { | |
204 c->tcp_nopush = NGX_TCP_NOPUSH_SET; | |
577 | 205 |
473 | 206 ngx_log_debug0(NGX_LOG_DEBUG_EVENT, c->log, 0, |
207 "tcp_nopush"); | |
208 } | |
97
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209 } |
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210 } |
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211 |
362
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212 /* get the file buf */ |
97
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213 |
362
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344
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214 if (header.nelts == 0 && cl && cl->buf->in_file && send < limit) { |
344
e366ba5db8f8
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215 file = cl->buf; |
97
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216 |
344
e366ba5db8f8
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217 /* coalesce the neighbouring file bufs */ |
97
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218 |
362
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diff
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219 do { |
473 | 220 size = cl->buf->file_last - cl->buf->file_pos; |
362
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diff
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221 |
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222 if (send + size > limit) { |
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223 size = limit - send; |
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diff
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224 |
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225 aligned = (cl->buf->file_pos + size + ngx_pagesize - 1) |
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226 & ~((off_t) ngx_pagesize - 1); |
362
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344
diff
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227 |
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228 if (aligned <= cl->buf->file_last) { |
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229 size = aligned - cl->buf->file_pos; |
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230 } |
195
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231 } |
97
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232 |
473 | 233 file_size += (size_t) size; |
362
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234 send += size; |
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235 fprev = cl->buf->file_pos + size; |
195
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236 cl = cl->next; |
362
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diff
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237 |
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diff
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238 } while (cl |
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239 && cl->buf->in_file |
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240 && send < limit |
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241 && file->file->fd == cl->buf->file->fd |
7650aea1816f
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242 && fprev == cl->buf->file_pos); |
97
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243 } |
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244 |
362
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245 if (file) { |
589 | 246 #if 1 |
247 if (file_size == 0) { | |
248 ngx_debug_point(); | |
249 return NGX_CHAIN_ERROR; | |
250 } | |
251 #endif | |
455 | 252 #if (NGX_HAVE_SENDFILE64) |
196
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195
diff
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253 offset = file->file_pos; |
198
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196
diff
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254 #else |
34995c5ec6c4
nginx-0.0.1-2003-11-27-22:01:37 import
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196
diff
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|
255 offset = (int32_t) file->file_pos; |
34995c5ec6c4
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196
diff
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256 #endif |
1198 | 257 |
258 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, c->log, 0, | |
259 "sendfile: @%O %uz", file->file_pos, file_size); | |
260 | |
473 | 261 rc = sendfile(c->fd, file->file->fd, &offset, file_size); |
195
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262 |
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263 if (rc == -1) { |
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264 err = ngx_errno; |
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265 |
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266 switch (err) { |
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267 case NGX_EAGAIN: |
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268 break; |
253
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269 |
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270 case NGX_EINTR: |
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271 eintr = 1; |
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272 break; |
195
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273 |
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274 default: |
253
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275 wev->error = 1; |
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276 ngx_connection_error(c, err, "sendfile() failed"); |
195
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277 return NGX_CHAIN_ERROR; |
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278 } |
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279 |
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280 ngx_log_debug0(NGX_LOG_DEBUG_EVENT, c->log, err, |
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281 "sendfile() is not ready"); |
195
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282 } |
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283 |
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284 sent = rc > 0 ? rc : 0; |
97
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285 |
253
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diff
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286 ngx_log_debug4(NGX_LOG_DEBUG_EVENT, c->log, 0, |
473 | 287 "sendfile: %d, @%O %O:%uz", |
288 rc, file->file_pos, sent, file_size); | |
253
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289 |
195
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290 } else { |
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291 rc = writev(c->fd, header.elts, header.nelts); |
97
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292 |
195
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293 if (rc == -1) { |
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294 err = ngx_errno; |
97
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295 |
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296 switch (err) { |
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297 case NGX_EAGAIN: |
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298 break; |
253
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299 |
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300 case NGX_EINTR: |
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301 eintr = 1; |
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302 break; |
97
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303 |
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304 default: |
253
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305 wev->error = 1; |
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306 ngx_connection_error(c, err, "writev() failed"); |
577 | 307 return NGX_CHAIN_ERROR; |
195
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308 } |
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309 |
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310 ngx_log_debug0(NGX_LOG_DEBUG_EVENT, c->log, err, |
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311 "writev() not ready"); |
97
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312 } |
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|
313 |
195
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314 sent = rc > 0 ? rc : 0; |
97
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315 |
473 | 316 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, 0, "writev: %O", sent); |
97
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|
317 } |
70d2345a903f
nginx-0.0.1-2003-05-29-17:02:09 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
318 |
473 | 319 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
|
320 complete = 1; |
7650aea1816f
nginx-0.0.7-2004-06-21-19:59:32 import
Igor Sysoev <igor@sysoev.ru>
parents:
344
diff
changeset
|
321 } |
7650aea1816f
nginx-0.0.7-2004-06-21-19:59:32 import
Igor Sysoev <igor@sysoev.ru>
parents:
344
diff
changeset
|
322 |
195
8dee38ea9117
nginx-0.0.1-2003-11-25-23:44:56 import
Igor Sysoev <igor@sysoev.ru>
parents:
97
diff
changeset
|
323 c->sent += sent; |
8dee38ea9117
nginx-0.0.1-2003-11-25-23:44:56 import
Igor Sysoev <igor@sysoev.ru>
parents:
97
diff
changeset
|
324 |
8dee38ea9117
nginx-0.0.1-2003-11-25-23:44:56 import
Igor Sysoev <igor@sysoev.ru>
parents:
97
diff
changeset
|
325 for (cl = in; cl; cl = cl->next) { |
8dee38ea9117
nginx-0.0.1-2003-11-25-23:44:56 import
Igor Sysoev <igor@sysoev.ru>
parents:
97
diff
changeset
|
326 |
344
e366ba5db8f8
nginx-0.0.3-2004-06-01-10:04:46 import
Igor Sysoev <igor@sysoev.ru>
parents:
343
diff
changeset
|
327 if (ngx_buf_special(cl->buf)) { |
195
8dee38ea9117
nginx-0.0.1-2003-11-25-23:44:56 import
Igor Sysoev <igor@sysoev.ru>
parents:
97
diff
changeset
|
328 continue; |
8dee38ea9117
nginx-0.0.1-2003-11-25-23:44:56 import
Igor Sysoev <igor@sysoev.ru>
parents:
97
diff
changeset
|
329 } |
8dee38ea9117
nginx-0.0.1-2003-11-25-23:44:56 import
Igor Sysoev <igor@sysoev.ru>
parents:
97
diff
changeset
|
330 |
8dee38ea9117
nginx-0.0.1-2003-11-25-23:44:56 import
Igor Sysoev <igor@sysoev.ru>
parents:
97
diff
changeset
|
331 if (sent == 0) { |
8dee38ea9117
nginx-0.0.1-2003-11-25-23:44:56 import
Igor Sysoev <igor@sysoev.ru>
parents:
97
diff
changeset
|
332 break; |
8dee38ea9117
nginx-0.0.1-2003-11-25-23:44:56 import
Igor Sysoev <igor@sysoev.ru>
parents:
97
diff
changeset
|
333 } |
8dee38ea9117
nginx-0.0.1-2003-11-25-23:44:56 import
Igor Sysoev <igor@sysoev.ru>
parents:
97
diff
changeset
|
334 |
344
e366ba5db8f8
nginx-0.0.3-2004-06-01-10:04:46 import
Igor Sysoev <igor@sysoev.ru>
parents:
343
diff
changeset
|
335 size = ngx_buf_size(cl->buf); |
195
8dee38ea9117
nginx-0.0.1-2003-11-25-23:44:56 import
Igor Sysoev <igor@sysoev.ru>
parents:
97
diff
changeset
|
336 |
8dee38ea9117
nginx-0.0.1-2003-11-25-23:44:56 import
Igor Sysoev <igor@sysoev.ru>
parents:
97
diff
changeset
|
337 if (sent >= size) { |
8dee38ea9117
nginx-0.0.1-2003-11-25-23:44:56 import
Igor Sysoev <igor@sysoev.ru>
parents:
97
diff
changeset
|
338 sent -= size; |
8dee38ea9117
nginx-0.0.1-2003-11-25-23:44:56 import
Igor Sysoev <igor@sysoev.ru>
parents:
97
diff
changeset
|
339 |
344
e366ba5db8f8
nginx-0.0.3-2004-06-01-10:04:46 import
Igor Sysoev <igor@sysoev.ru>
parents:
343
diff
changeset
|
340 if (ngx_buf_in_memory(cl->buf)) { |
e366ba5db8f8
nginx-0.0.3-2004-06-01-10:04:46 import
Igor Sysoev <igor@sysoev.ru>
parents:
343
diff
changeset
|
341 cl->buf->pos = cl->buf->last; |
195
8dee38ea9117
nginx-0.0.1-2003-11-25-23:44:56 import
Igor Sysoev <igor@sysoev.ru>
parents:
97
diff
changeset
|
342 } |
8dee38ea9117
nginx-0.0.1-2003-11-25-23:44:56 import
Igor Sysoev <igor@sysoev.ru>
parents:
97
diff
changeset
|
343 |
344
e366ba5db8f8
nginx-0.0.3-2004-06-01-10:04:46 import
Igor Sysoev <igor@sysoev.ru>
parents:
343
diff
changeset
|
344 if (cl->buf->in_file) { |
e366ba5db8f8
nginx-0.0.3-2004-06-01-10:04:46 import
Igor Sysoev <igor@sysoev.ru>
parents:
343
diff
changeset
|
345 cl->buf->file_pos = cl->buf->file_last; |
195
8dee38ea9117
nginx-0.0.1-2003-11-25-23:44:56 import
Igor Sysoev <igor@sysoev.ru>
parents:
97
diff
changeset
|
346 } |
8dee38ea9117
nginx-0.0.1-2003-11-25-23:44:56 import
Igor Sysoev <igor@sysoev.ru>
parents:
97
diff
changeset
|
347 |
8dee38ea9117
nginx-0.0.1-2003-11-25-23:44:56 import
Igor Sysoev <igor@sysoev.ru>
parents:
97
diff
changeset
|
348 continue; |
8dee38ea9117
nginx-0.0.1-2003-11-25-23:44:56 import
Igor Sysoev <igor@sysoev.ru>
parents:
97
diff
changeset
|
349 } |
8dee38ea9117
nginx-0.0.1-2003-11-25-23:44:56 import
Igor Sysoev <igor@sysoev.ru>
parents:
97
diff
changeset
|
350 |
344
e366ba5db8f8
nginx-0.0.3-2004-06-01-10:04:46 import
Igor Sysoev <igor@sysoev.ru>
parents:
343
diff
changeset
|
351 if (ngx_buf_in_memory(cl->buf)) { |
473 | 352 cl->buf->pos += (size_t) sent; |
195
8dee38ea9117
nginx-0.0.1-2003-11-25-23:44:56 import
Igor Sysoev <igor@sysoev.ru>
parents:
97
diff
changeset
|
353 } |
8dee38ea9117
nginx-0.0.1-2003-11-25-23:44:56 import
Igor Sysoev <igor@sysoev.ru>
parents:
97
diff
changeset
|
354 |
344
e366ba5db8f8
nginx-0.0.3-2004-06-01-10:04:46 import
Igor Sysoev <igor@sysoev.ru>
parents:
343
diff
changeset
|
355 if (cl->buf->in_file) { |
e366ba5db8f8
nginx-0.0.3-2004-06-01-10:04:46 import
Igor Sysoev <igor@sysoev.ru>
parents:
343
diff
changeset
|
356 cl->buf->file_pos += sent; |
195
8dee38ea9117
nginx-0.0.1-2003-11-25-23:44:56 import
Igor Sysoev <igor@sysoev.ru>
parents:
97
diff
changeset
|
357 } |
8dee38ea9117
nginx-0.0.1-2003-11-25-23:44:56 import
Igor Sysoev <igor@sysoev.ru>
parents:
97
diff
changeset
|
358 |
8dee38ea9117
nginx-0.0.1-2003-11-25-23:44:56 import
Igor Sysoev <igor@sysoev.ru>
parents:
97
diff
changeset
|
359 break; |
97
70d2345a903f
nginx-0.0.1-2003-05-29-17:02:09 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
360 } |
70d2345a903f
nginx-0.0.1-2003-05-29-17:02:09 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
361 |
362
7650aea1816f
nginx-0.0.7-2004-06-21-19:59:32 import
Igor Sysoev <igor@sysoev.ru>
parents:
344
diff
changeset
|
362 if (eintr) { |
577 | 363 continue; |
362
7650aea1816f
nginx-0.0.7-2004-06-21-19:59:32 import
Igor Sysoev <igor@sysoev.ru>
parents:
344
diff
changeset
|
364 } |
195
8dee38ea9117
nginx-0.0.1-2003-11-25-23:44:56 import
Igor Sysoev <igor@sysoev.ru>
parents:
97
diff
changeset
|
365 |
577 | 366 if (!complete) { |
362
7650aea1816f
nginx-0.0.7-2004-06-21-19:59:32 import
Igor Sysoev <igor@sysoev.ru>
parents:
344
diff
changeset
|
367 wev->ready = 0; |
7650aea1816f
nginx-0.0.7-2004-06-21-19:59:32 import
Igor Sysoev <igor@sysoev.ru>
parents:
344
diff
changeset
|
368 return cl; |
7650aea1816f
nginx-0.0.7-2004-06-21-19:59:32 import
Igor Sysoev <igor@sysoev.ru>
parents:
344
diff
changeset
|
369 } |
7650aea1816f
nginx-0.0.7-2004-06-21-19:59:32 import
Igor Sysoev <igor@sysoev.ru>
parents:
344
diff
changeset
|
370 |
7650aea1816f
nginx-0.0.7-2004-06-21-19:59:32 import
Igor Sysoev <igor@sysoev.ru>
parents:
344
diff
changeset
|
371 if (send >= limit || cl == NULL) { |
7650aea1816f
nginx-0.0.7-2004-06-21-19:59:32 import
Igor Sysoev <igor@sysoev.ru>
parents:
344
diff
changeset
|
372 return cl; |
7650aea1816f
nginx-0.0.7-2004-06-21-19:59:32 import
Igor Sysoev <igor@sysoev.ru>
parents:
344
diff
changeset
|
373 } |
7650aea1816f
nginx-0.0.7-2004-06-21-19:59:32 import
Igor Sysoev <igor@sysoev.ru>
parents:
344
diff
changeset
|
374 |
7650aea1816f
nginx-0.0.7-2004-06-21-19:59:32 import
Igor Sysoev <igor@sysoev.ru>
parents:
344
diff
changeset
|
375 in = cl; |
97
70d2345a903f
nginx-0.0.1-2003-05-29-17:02:09 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
376 } |
70d2345a903f
nginx-0.0.1-2003-05-29-17:02:09 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
377 } |