Mercurial > hg > nginx-quic
annotate src/os/unix/ngx_linux_sendfile_chain.c @ 4915:e62219793beb
Upstream: better detection of connect() failures with kqueue.
Pending EOF might be reported on both read and write events, whichever
comes first, so check both of them.
Patch by Yichun Zhang (agentzh), slightly modified.
author | Maxim Dounin <mdounin@mdounin.ru> |
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date | Fri, 16 Nov 2012 18:29:19 +0000 |
parents | 089cc5154c1e |
children | 23a186e8ca45 |
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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7 |
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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_LIMIT 2147483647L |
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28 |
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29 |
597 | 30 #if (IOV_MAX > 64) |
31 #define NGX_HEADERS 64 | |
32 #else | |
33 #define NGX_HEADERS IOV_MAX | |
34 #endif | |
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36 |
585 | 37 ngx_chain_t * |
38 ngx_linux_sendfile_chain(ngx_connection_t *c, ngx_chain_t *in, off_t limit) | |
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39 { |
589 | 40 int rc, tcp_nodelay; |
41 off_t size, send, prev_send, aligned, sent, fprev; | |
42 u_char *prev; | |
43 size_t file_size; | |
44 ngx_err_t err; | |
45 ngx_buf_t *file; | |
46 ngx_uint_t eintr, complete; | |
47 ngx_array_t header; | |
48 ngx_event_t *wev; | |
49 ngx_chain_t *cl; | |
50 struct iovec *iov, headers[NGX_HEADERS]; | |
455 | 51 #if (NGX_HAVE_SENDFILE64) |
589 | 52 off_t offset; |
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53 #else |
589 | 54 int32_t offset; |
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55 #endif |
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56 |
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57 wev = c->write; |
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58 |
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59 if (!wev->ready) { |
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60 return in; |
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61 } |
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62 |
473 | 63 |
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64 /* the maximum limit size is 2G-1 - the page size */ |
473 | 65 |
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66 if (limit == 0 || limit > (off_t) (NGX_SENDFILE_LIMIT - ngx_pagesize)) { |
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67 limit = NGX_SENDFILE_LIMIT - ngx_pagesize; |
473 | 68 } |
69 | |
70 | |
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71 send = 0; |
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72 |
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73 header.elts = headers; |
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74 header.size = sizeof(struct iovec); |
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75 header.nalloc = NGX_HEADERS; |
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76 header.pool = c->pool; |
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77 |
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78 for ( ;; ) { |
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79 file = NULL; |
473 | 80 file_size = 0; |
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81 eintr = 0; |
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82 complete = 0; |
473 | 83 prev_send = send; |
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84 |
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85 header.nelts = 0; |
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86 |
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87 prev = NULL; |
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88 iov = NULL; |
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89 |
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90 /* create the iovec and coalesce the neighbouring bufs */ |
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91 |
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92 for (cl = in; cl && send < limit; cl = cl->next) { |
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93 |
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94 if (ngx_buf_special(cl->buf)) { |
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95 continue; |
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96 } |
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97 |
479 | 98 #if 1 |
99 if (!ngx_buf_in_memory(cl->buf) && !cl->buf->in_file) { | |
100 ngx_log_error(NGX_LOG_ALERT, c->log, 0, | |
483 | 101 "zero size buf in sendfile " |
102 "t:%d r:%d f:%d %p %p-%p %p %O-%O", | |
103 cl->buf->temporary, | |
104 cl->buf->recycled, | |
105 cl->buf->in_file, | |
106 cl->buf->start, | |
107 cl->buf->pos, | |
108 cl->buf->last, | |
109 cl->buf->file, | |
110 cl->buf->file_pos, | |
111 cl->buf->file_last); | |
112 | |
479 | 113 ngx_debug_point(); |
489 | 114 |
115 return NGX_CHAIN_ERROR; | |
479 | 116 } |
117 #endif | |
118 | |
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119 if (!ngx_buf_in_memory_only(cl->buf)) { |
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120 break; |
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121 } |
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122 |
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123 size = cl->buf->last - cl->buf->pos; |
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124 |
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125 if (send + size > limit) { |
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126 size = limit - send; |
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127 } |
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128 |
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129 if (prev == cl->buf->pos) { |
473 | 130 iov->iov_len += (size_t) size; |
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131 |
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132 } else { |
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133 if (header.nelts >= IOV_MAX) { |
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134 break; |
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135 } |
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136 |
501 | 137 iov = ngx_array_push(&header); |
138 if (iov == NULL) { | |
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139 return NGX_CHAIN_ERROR; |
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140 } |
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141 |
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142 iov->iov_base = (void *) cl->buf->pos; |
473 | 143 iov->iov_len = (size_t) size; |
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144 } |
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145 |
473 | 146 prev = cl->buf->pos + (size_t) size; |
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147 send += size; |
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148 } |
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149 |
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150 /* set TCP_CORK if there is a header before a file */ |
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151 |
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152 if (c->tcp_nopush == NGX_TCP_NOPUSH_UNSET |
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153 && header.nelts != 0 |
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154 && cl |
344
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155 && cl->buf->in_file) |
195
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156 { |
473 | 157 /* the TCP_CORK and TCP_NODELAY are mutually exclusive */ |
158 | |
483 | 159 if (c->tcp_nodelay == NGX_TCP_NODELAY_SET) { |
473 | 160 |
161 tcp_nodelay = 0; | |
162 | |
163 if (setsockopt(c->fd, IPPROTO_TCP, TCP_NODELAY, | |
164 (const void *) &tcp_nodelay, sizeof(int)) == -1) | |
165 { | |
166 err = ngx_errno; | |
97
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167 |
473 | 168 /* |
479 | 169 * there is a tiny chance to be interrupted, however, |
473 | 170 * we continue a processing with the TCP_NODELAY |
171 * and without the TCP_CORK | |
172 */ | |
173 | |
577 | 174 if (err != NGX_EINTR) { |
473 | 175 wev->error = 1; |
483 | 176 ngx_connection_error(c, err, |
473 | 177 "setsockopt(TCP_NODELAY) failed"); |
178 return NGX_CHAIN_ERROR; | |
179 } | |
180 | |
181 } else { | |
483 | 182 c->tcp_nodelay = NGX_TCP_NODELAY_UNSET; |
97
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183 |
473 | 184 ngx_log_debug0(NGX_LOG_DEBUG_HTTP, c->log, 0, |
185 "no tcp_nodelay"); | |
253
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diff
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186 } |
473 | 187 } |
188 | |
483 | 189 if (c->tcp_nodelay == NGX_TCP_NODELAY_UNSET) { |
473 | 190 |
191 if (ngx_tcp_nopush(c->fd) == NGX_ERROR) { | |
192 err = ngx_errno; | |
253
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diff
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193 |
473 | 194 /* |
479 | 195 * there is a tiny chance to be interrupted, however, |
473 | 196 * we continue a processing without the TCP_CORK |
197 */ | |
344
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198 |
577 | 199 if (err != NGX_EINTR) { |
473 | 200 wev->error = 1; |
201 ngx_connection_error(c, err, | |
202 ngx_tcp_nopush_n " failed"); | |
203 return NGX_CHAIN_ERROR; | |
204 } | |
205 | |
206 } else { | |
207 c->tcp_nopush = NGX_TCP_NOPUSH_SET; | |
577 | 208 |
473 | 209 ngx_log_debug0(NGX_LOG_DEBUG_EVENT, c->log, 0, |
210 "tcp_nopush"); | |
211 } | |
97
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212 } |
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213 } |
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214 |
362
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215 /* get the file buf */ |
97
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216 |
362
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217 if (header.nelts == 0 && cl && cl->buf->in_file && send < limit) { |
344
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218 file = cl->buf; |
97
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219 |
344
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220 /* coalesce the neighbouring file bufs */ |
97
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221 |
362
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222 do { |
473 | 223 size = cl->buf->file_last - cl->buf->file_pos; |
362
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224 |
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225 if (send + size > limit) { |
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226 size = limit - send; |
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227 |
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228 aligned = (cl->buf->file_pos + size + ngx_pagesize - 1) |
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229 & ~((off_t) ngx_pagesize - 1); |
362
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230 |
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231 if (aligned <= cl->buf->file_last) { |
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232 size = aligned - cl->buf->file_pos; |
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233 } |
195
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234 } |
97
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235 |
473 | 236 file_size += (size_t) size; |
362
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237 send += size; |
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238 fprev = cl->buf->file_pos + size; |
195
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239 cl = cl->next; |
362
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diff
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240 |
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diff
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241 } while (cl |
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242 && cl->buf->in_file |
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243 && send < limit |
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244 && file->file->fd == cl->buf->file->fd |
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245 && fprev == cl->buf->file_pos); |
97
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246 } |
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247 |
362
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248 if (file) { |
589 | 249 #if 1 |
250 if (file_size == 0) { | |
251 ngx_debug_point(); | |
252 return NGX_CHAIN_ERROR; | |
253 } | |
254 #endif | |
455 | 255 #if (NGX_HAVE_SENDFILE64) |
196
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195
diff
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256 offset = file->file_pos; |
198
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196
diff
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257 #else |
34995c5ec6c4
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196
diff
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258 offset = (int32_t) file->file_pos; |
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196
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259 #endif |
1198 | 260 |
261 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, c->log, 0, | |
262 "sendfile: @%O %uz", file->file_pos, file_size); | |
263 | |
473 | 264 rc = sendfile(c->fd, file->file->fd, &offset, file_size); |
195
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265 |
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266 if (rc == -1) { |
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267 err = ngx_errno; |
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268 |
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269 switch (err) { |
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270 case NGX_EAGAIN: |
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271 break; |
253
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272 |
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273 case NGX_EINTR: |
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274 eintr = 1; |
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275 break; |
195
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276 |
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277 default: |
253
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278 wev->error = 1; |
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279 ngx_connection_error(c, err, "sendfile() failed"); |
195
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280 return NGX_CHAIN_ERROR; |
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281 } |
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282 |
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283 ngx_log_debug0(NGX_LOG_DEBUG_EVENT, c->log, err, |
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284 "sendfile() is not ready"); |
195
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285 } |
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286 |
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287 sent = rc > 0 ? rc : 0; |
97
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288 |
253
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289 ngx_log_debug4(NGX_LOG_DEBUG_EVENT, c->log, 0, |
473 | 290 "sendfile: %d, @%O %O:%uz", |
291 rc, file->file_pos, sent, file_size); | |
253
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292 |
195
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293 } else { |
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294 rc = writev(c->fd, header.elts, header.nelts); |
97
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295 |
195
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296 if (rc == -1) { |
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297 err = ngx_errno; |
97
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298 |
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299 switch (err) { |
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300 case NGX_EAGAIN: |
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301 break; |
253
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302 |
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303 case NGX_EINTR: |
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304 eintr = 1; |
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305 break; |
97
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306 |
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307 default: |
253
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308 wev->error = 1; |
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309 ngx_connection_error(c, err, "writev() failed"); |
577 | 310 return NGX_CHAIN_ERROR; |
195
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311 } |
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312 |
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313 ngx_log_debug0(NGX_LOG_DEBUG_EVENT, c->log, err, |
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314 "writev() not ready"); |
97
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315 } |
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|
316 |
195
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317 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
|
318 |
473 | 319 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
|
320 } |
70d2345a903f
nginx-0.0.1-2003-05-29-17:02:09 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
321 |
473 | 322 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
|
323 complete = 1; |
7650aea1816f
nginx-0.0.7-2004-06-21-19:59:32 import
Igor Sysoev <igor@sysoev.ru>
parents:
344
diff
changeset
|
324 } |
7650aea1816f
nginx-0.0.7-2004-06-21-19:59:32 import
Igor Sysoev <igor@sysoev.ru>
parents:
344
diff
changeset
|
325 |
195
8dee38ea9117
nginx-0.0.1-2003-11-25-23:44:56 import
Igor Sysoev <igor@sysoev.ru>
parents:
97
diff
changeset
|
326 c->sent += sent; |
8dee38ea9117
nginx-0.0.1-2003-11-25-23:44:56 import
Igor Sysoev <igor@sysoev.ru>
parents:
97
diff
changeset
|
327 |
8dee38ea9117
nginx-0.0.1-2003-11-25-23:44:56 import
Igor Sysoev <igor@sysoev.ru>
parents:
97
diff
changeset
|
328 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
|
329 |
344
e366ba5db8f8
nginx-0.0.3-2004-06-01-10:04:46 import
Igor Sysoev <igor@sysoev.ru>
parents:
343
diff
changeset
|
330 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
|
331 continue; |
8dee38ea9117
nginx-0.0.1-2003-11-25-23:44:56 import
Igor Sysoev <igor@sysoev.ru>
parents:
97
diff
changeset
|
332 } |
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 if (sent == 0) { |
8dee38ea9117
nginx-0.0.1-2003-11-25-23:44:56 import
Igor Sysoev <igor@sysoev.ru>
parents:
97
diff
changeset
|
335 break; |
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 |
344
e366ba5db8f8
nginx-0.0.3-2004-06-01-10:04:46 import
Igor Sysoev <igor@sysoev.ru>
parents:
343
diff
changeset
|
338 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
|
339 |
8dee38ea9117
nginx-0.0.1-2003-11-25-23:44:56 import
Igor Sysoev <igor@sysoev.ru>
parents:
97
diff
changeset
|
340 if (sent >= size) { |
8dee38ea9117
nginx-0.0.1-2003-11-25-23:44:56 import
Igor Sysoev <igor@sysoev.ru>
parents:
97
diff
changeset
|
341 sent -= size; |
8dee38ea9117
nginx-0.0.1-2003-11-25-23:44:56 import
Igor Sysoev <igor@sysoev.ru>
parents:
97
diff
changeset
|
342 |
344
e366ba5db8f8
nginx-0.0.3-2004-06-01-10:04:46 import
Igor Sysoev <igor@sysoev.ru>
parents:
343
diff
changeset
|
343 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
|
344 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
|
345 } |
8dee38ea9117
nginx-0.0.1-2003-11-25-23:44:56 import
Igor Sysoev <igor@sysoev.ru>
parents:
97
diff
changeset
|
346 |
344
e366ba5db8f8
nginx-0.0.3-2004-06-01-10:04:46 import
Igor Sysoev <igor@sysoev.ru>
parents:
343
diff
changeset
|
347 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
|
348 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
|
349 } |
8dee38ea9117
nginx-0.0.1-2003-11-25-23:44:56 import
Igor Sysoev <igor@sysoev.ru>
parents:
97
diff
changeset
|
350 |
8dee38ea9117
nginx-0.0.1-2003-11-25-23:44:56 import
Igor Sysoev <igor@sysoev.ru>
parents:
97
diff
changeset
|
351 continue; |
8dee38ea9117
nginx-0.0.1-2003-11-25-23:44:56 import
Igor Sysoev <igor@sysoev.ru>
parents:
97
diff
changeset
|
352 } |
8dee38ea9117
nginx-0.0.1-2003-11-25-23:44:56 import
Igor Sysoev <igor@sysoev.ru>
parents:
97
diff
changeset
|
353 |
344
e366ba5db8f8
nginx-0.0.3-2004-06-01-10:04:46 import
Igor Sysoev <igor@sysoev.ru>
parents:
343
diff
changeset
|
354 if (ngx_buf_in_memory(cl->buf)) { |
473 | 355 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
|
356 } |
8dee38ea9117
nginx-0.0.1-2003-11-25-23:44:56 import
Igor Sysoev <igor@sysoev.ru>
parents:
97
diff
changeset
|
357 |
344
e366ba5db8f8
nginx-0.0.3-2004-06-01-10:04:46 import
Igor Sysoev <igor@sysoev.ru>
parents:
343
diff
changeset
|
358 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
|
359 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
|
360 } |
8dee38ea9117
nginx-0.0.1-2003-11-25-23:44:56 import
Igor Sysoev <igor@sysoev.ru>
parents:
97
diff
changeset
|
361 |
8dee38ea9117
nginx-0.0.1-2003-11-25-23:44:56 import
Igor Sysoev <igor@sysoev.ru>
parents:
97
diff
changeset
|
362 break; |
97
70d2345a903f
nginx-0.0.1-2003-05-29-17:02:09 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
363 } |
70d2345a903f
nginx-0.0.1-2003-05-29-17:02:09 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
364 |
362
7650aea1816f
nginx-0.0.7-2004-06-21-19:59:32 import
Igor Sysoev <igor@sysoev.ru>
parents:
344
diff
changeset
|
365 if (eintr) { |
577 | 366 continue; |
362
7650aea1816f
nginx-0.0.7-2004-06-21-19:59:32 import
Igor Sysoev <igor@sysoev.ru>
parents:
344
diff
changeset
|
367 } |
195
8dee38ea9117
nginx-0.0.1-2003-11-25-23:44:56 import
Igor Sysoev <igor@sysoev.ru>
parents:
97
diff
changeset
|
368 |
577 | 369 if (!complete) { |
362
7650aea1816f
nginx-0.0.7-2004-06-21-19:59:32 import
Igor Sysoev <igor@sysoev.ru>
parents:
344
diff
changeset
|
370 wev->ready = 0; |
7650aea1816f
nginx-0.0.7-2004-06-21-19:59:32 import
Igor Sysoev <igor@sysoev.ru>
parents:
344
diff
changeset
|
371 return cl; |
7650aea1816f
nginx-0.0.7-2004-06-21-19:59:32 import
Igor Sysoev <igor@sysoev.ru>
parents:
344
diff
changeset
|
372 } |
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 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
|
375 return cl; |
7650aea1816f
nginx-0.0.7-2004-06-21-19:59:32 import
Igor Sysoev <igor@sysoev.ru>
parents:
344
diff
changeset
|
376 } |
7650aea1816f
nginx-0.0.7-2004-06-21-19:59:32 import
Igor Sysoev <igor@sysoev.ru>
parents:
344
diff
changeset
|
377 |
7650aea1816f
nginx-0.0.7-2004-06-21-19:59:32 import
Igor Sysoev <igor@sysoev.ru>
parents:
344
diff
changeset
|
378 in = cl; |
97
70d2345a903f
nginx-0.0.1-2003-05-29-17:02:09 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
379 } |
70d2345a903f
nginx-0.0.1-2003-05-29-17:02:09 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
380 } |