Mercurial > hg > nginx-quic
annotate src/os/unix/ngx_linux_sendfile_chain.c @ 4500:9dfe02dd0f11
Added msleep() on reload to allow new processes to start.
This is expected to ensure smoother operation on reload (and with less
chance of listen queue overflows).
Prodded by Igor Sysoev.
author | Maxim Dounin <mdounin@mdounin.ru> |
---|---|
date | Tue, 28 Feb 2012 11:40:18 +0000 |
parents | d620f497c50f |
children | 089cc5154c1e |
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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35 |
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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; |
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93 cl && header.nelts < IOV_MAX && send < limit; |
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94 cl = cl->next) |
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95 { |
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96 if (ngx_buf_special(cl->buf)) { |
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97 continue; |
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98 } |
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99 |
479 | 100 #if 1 |
101 if (!ngx_buf_in_memory(cl->buf) && !cl->buf->in_file) { | |
102 ngx_log_error(NGX_LOG_ALERT, c->log, 0, | |
483 | 103 "zero size buf in sendfile " |
104 "t:%d r:%d f:%d %p %p-%p %p %O-%O", | |
105 cl->buf->temporary, | |
106 cl->buf->recycled, | |
107 cl->buf->in_file, | |
108 cl->buf->start, | |
109 cl->buf->pos, | |
110 cl->buf->last, | |
111 cl->buf->file, | |
112 cl->buf->file_pos, | |
113 cl->buf->file_last); | |
114 | |
479 | 115 ngx_debug_point(); |
489 | 116 |
117 return NGX_CHAIN_ERROR; | |
479 | 118 } |
119 #endif | |
120 | |
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121 if (!ngx_buf_in_memory_only(cl->buf)) { |
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122 break; |
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123 } |
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124 |
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125 size = cl->buf->last - cl->buf->pos; |
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126 |
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127 if (send + size > limit) { |
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128 size = limit - send; |
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129 } |
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130 |
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131 if (prev == cl->buf->pos) { |
473 | 132 iov->iov_len += (size_t) size; |
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133 |
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134 } else { |
501 | 135 iov = ngx_array_push(&header); |
136 if (iov == NULL) { | |
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137 return NGX_CHAIN_ERROR; |
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138 } |
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139 |
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140 iov->iov_base = (void *) cl->buf->pos; |
473 | 141 iov->iov_len = (size_t) size; |
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142 } |
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143 |
473 | 144 prev = cl->buf->pos + (size_t) size; |
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145 send += size; |
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146 } |
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147 |
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148 /* set TCP_CORK if there is a header before a file */ |
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149 |
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150 if (c->tcp_nopush == NGX_TCP_NOPUSH_UNSET |
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151 && header.nelts != 0 |
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152 && cl |
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parents:
343
diff
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|
153 && cl->buf->in_file) |
195
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diff
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154 { |
473 | 155 /* the TCP_CORK and TCP_NODELAY are mutually exclusive */ |
156 | |
483 | 157 if (c->tcp_nodelay == NGX_TCP_NODELAY_SET) { |
473 | 158 |
159 tcp_nodelay = 0; | |
160 | |
161 if (setsockopt(c->fd, IPPROTO_TCP, TCP_NODELAY, | |
162 (const void *) &tcp_nodelay, sizeof(int)) == -1) | |
163 { | |
164 err = ngx_errno; | |
97
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165 |
473 | 166 /* |
479 | 167 * there is a tiny chance to be interrupted, however, |
473 | 168 * we continue a processing with the TCP_NODELAY |
169 * and without the TCP_CORK | |
170 */ | |
171 | |
577 | 172 if (err != NGX_EINTR) { |
473 | 173 wev->error = 1; |
483 | 174 ngx_connection_error(c, err, |
473 | 175 "setsockopt(TCP_NODELAY) failed"); |
176 return NGX_CHAIN_ERROR; | |
177 } | |
178 | |
179 } else { | |
483 | 180 c->tcp_nodelay = NGX_TCP_NODELAY_UNSET; |
97
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181 |
473 | 182 ngx_log_debug0(NGX_LOG_DEBUG_HTTP, c->log, 0, |
183 "no tcp_nodelay"); | |
253
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nginx-0.0.2-2004-02-09-10:46:43 import
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247
diff
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|
184 } |
473 | 185 } |
186 | |
483 | 187 if (c->tcp_nodelay == NGX_TCP_NODELAY_UNSET) { |
473 | 188 |
189 if (ngx_tcp_nopush(c->fd) == NGX_ERROR) { | |
190 err = ngx_errno; | |
253
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diff
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191 |
473 | 192 /* |
479 | 193 * there is a tiny chance to be interrupted, however, |
473 | 194 * we continue a processing without the TCP_CORK |
195 */ | |
344
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196 |
577 | 197 if (err != NGX_EINTR) { |
473 | 198 wev->error = 1; |
199 ngx_connection_error(c, err, | |
200 ngx_tcp_nopush_n " failed"); | |
201 return NGX_CHAIN_ERROR; | |
202 } | |
203 | |
204 } else { | |
205 c->tcp_nopush = NGX_TCP_NOPUSH_SET; | |
577 | 206 |
473 | 207 ngx_log_debug0(NGX_LOG_DEBUG_EVENT, c->log, 0, |
208 "tcp_nopush"); | |
209 } | |
97
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210 } |
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211 } |
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parents:
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212 |
362
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diff
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213 /* get the file buf */ |
97
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214 |
362
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344
diff
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215 if (header.nelts == 0 && cl && cl->buf->in_file && send < limit) { |
344
e366ba5db8f8
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216 file = cl->buf; |
97
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parents:
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217 |
344
e366ba5db8f8
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218 /* coalesce the neighbouring file bufs */ |
97
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219 |
362
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diff
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220 do { |
473 | 221 size = cl->buf->file_last - cl->buf->file_pos; |
362
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diff
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222 |
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223 if (send + size > limit) { |
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224 size = limit - send; |
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diff
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225 |
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226 aligned = (cl->buf->file_pos + size + ngx_pagesize - 1) |
1182
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227 & ~((off_t) ngx_pagesize - 1); |
362
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parents:
344
diff
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|
228 |
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diff
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229 if (aligned <= cl->buf->file_last) { |
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230 size = aligned - cl->buf->file_pos; |
7650aea1816f
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344
diff
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231 } |
195
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232 } |
97
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233 |
473 | 234 file_size += (size_t) size; |
362
7650aea1816f
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parents:
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diff
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235 send += size; |
7650aea1816f
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diff
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236 fprev = cl->buf->file_pos + size; |
195
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237 cl = cl->next; |
362
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344
diff
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|
238 |
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344
diff
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|
239 } while (cl |
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diff
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240 && cl->buf->in_file |
7650aea1816f
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344
diff
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241 && send < limit |
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344
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242 && file->file->fd == cl->buf->file->fd |
7650aea1816f
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parents:
344
diff
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243 && fprev == cl->buf->file_pos); |
97
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244 } |
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245 |
362
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246 if (file) { |
589 | 247 #if 1 |
248 if (file_size == 0) { | |
249 ngx_debug_point(); | |
250 return NGX_CHAIN_ERROR; | |
251 } | |
252 #endif | |
455 | 253 #if (NGX_HAVE_SENDFILE64) |
196
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nginx-0.0.1-2003-11-26-18:42:18 import
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parents:
195
diff
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254 offset = file->file_pos; |
198
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parents:
196
diff
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255 #else |
34995c5ec6c4
nginx-0.0.1-2003-11-27-22:01:37 import
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parents:
196
diff
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256 offset = (int32_t) file->file_pos; |
34995c5ec6c4
nginx-0.0.1-2003-11-27-22:01:37 import
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parents:
196
diff
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|
257 #endif |
1198 | 258 |
259 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, c->log, 0, | |
260 "sendfile: @%O %uz", file->file_pos, file_size); | |
261 | |
473 | 262 rc = sendfile(c->fd, file->file->fd, &offset, file_size); |
195
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263 |
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264 if (rc == -1) { |
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265 err = ngx_errno; |
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266 |
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267 switch (err) { |
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268 case NGX_EAGAIN: |
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269 break; |
253
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270 |
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271 case NGX_EINTR: |
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272 eintr = 1; |
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273 break; |
195
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274 |
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275 default: |
253
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247
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276 wev->error = 1; |
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247
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277 ngx_connection_error(c, err, "sendfile() failed"); |
195
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278 return NGX_CHAIN_ERROR; |
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279 } |
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280 |
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281 ngx_log_debug0(NGX_LOG_DEBUG_EVENT, c->log, err, |
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282 "sendfile() is not ready"); |
195
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283 } |
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284 |
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285 sent = rc > 0 ? rc : 0; |
97
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parents:
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|
286 |
253
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287 ngx_log_debug4(NGX_LOG_DEBUG_EVENT, c->log, 0, |
473 | 288 "sendfile: %d, @%O %O:%uz", |
289 rc, file->file_pos, sent, file_size); | |
253
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290 |
195
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291 } else { |
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292 rc = writev(c->fd, header.elts, header.nelts); |
97
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293 |
195
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294 if (rc == -1) { |
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295 err = ngx_errno; |
97
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296 |
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297 switch (err) { |
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298 case NGX_EAGAIN: |
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299 break; |
253
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300 |
3063
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301 case NGX_EINTR: |
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302 eintr = 1; |
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303 break; |
97
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304 |
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305 default: |
253
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306 wev->error = 1; |
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diff
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307 ngx_connection_error(c, err, "writev() failed"); |
577 | 308 return NGX_CHAIN_ERROR; |
195
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309 } |
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310 |
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311 ngx_log_debug0(NGX_LOG_DEBUG_EVENT, c->log, err, |
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312 "writev() not ready"); |
97
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|
313 } |
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|
314 |
195
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diff
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|
315 sent = rc > 0 ? rc : 0; |
97
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|
316 |
473 | 317 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
|
318 } |
70d2345a903f
nginx-0.0.1-2003-05-29-17:02:09 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
319 |
473 | 320 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
|
321 complete = 1; |
7650aea1816f
nginx-0.0.7-2004-06-21-19:59:32 import
Igor Sysoev <igor@sysoev.ru>
parents:
344
diff
changeset
|
322 } |
7650aea1816f
nginx-0.0.7-2004-06-21-19:59:32 import
Igor Sysoev <igor@sysoev.ru>
parents:
344
diff
changeset
|
323 |
195
8dee38ea9117
nginx-0.0.1-2003-11-25-23:44:56 import
Igor Sysoev <igor@sysoev.ru>
parents:
97
diff
changeset
|
324 c->sent += sent; |
8dee38ea9117
nginx-0.0.1-2003-11-25-23:44:56 import
Igor Sysoev <igor@sysoev.ru>
parents:
97
diff
changeset
|
325 |
8dee38ea9117
nginx-0.0.1-2003-11-25-23:44:56 import
Igor Sysoev <igor@sysoev.ru>
parents:
97
diff
changeset
|
326 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
|
327 |
344
e366ba5db8f8
nginx-0.0.3-2004-06-01-10:04:46 import
Igor Sysoev <igor@sysoev.ru>
parents:
343
diff
changeset
|
328 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
|
329 continue; |
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 |
8dee38ea9117
nginx-0.0.1-2003-11-25-23:44:56 import
Igor Sysoev <igor@sysoev.ru>
parents:
97
diff
changeset
|
332 if (sent == 0) { |
8dee38ea9117
nginx-0.0.1-2003-11-25-23:44:56 import
Igor Sysoev <igor@sysoev.ru>
parents:
97
diff
changeset
|
333 break; |
8dee38ea9117
nginx-0.0.1-2003-11-25-23:44:56 import
Igor Sysoev <igor@sysoev.ru>
parents:
97
diff
changeset
|
334 } |
8dee38ea9117
nginx-0.0.1-2003-11-25-23:44:56 import
Igor Sysoev <igor@sysoev.ru>
parents:
97
diff
changeset
|
335 |
344
e366ba5db8f8
nginx-0.0.3-2004-06-01-10:04:46 import
Igor Sysoev <igor@sysoev.ru>
parents:
343
diff
changeset
|
336 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
|
337 |
8dee38ea9117
nginx-0.0.1-2003-11-25-23:44:56 import
Igor Sysoev <igor@sysoev.ru>
parents:
97
diff
changeset
|
338 if (sent >= size) { |
8dee38ea9117
nginx-0.0.1-2003-11-25-23:44:56 import
Igor Sysoev <igor@sysoev.ru>
parents:
97
diff
changeset
|
339 sent -= size; |
8dee38ea9117
nginx-0.0.1-2003-11-25-23:44:56 import
Igor Sysoev <igor@sysoev.ru>
parents:
97
diff
changeset
|
340 |
344
e366ba5db8f8
nginx-0.0.3-2004-06-01-10:04:46 import
Igor Sysoev <igor@sysoev.ru>
parents:
343
diff
changeset
|
341 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
|
342 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
|
343 } |
8dee38ea9117
nginx-0.0.1-2003-11-25-23:44:56 import
Igor Sysoev <igor@sysoev.ru>
parents:
97
diff
changeset
|
344 |
344
e366ba5db8f8
nginx-0.0.3-2004-06-01-10:04:46 import
Igor Sysoev <igor@sysoev.ru>
parents:
343
diff
changeset
|
345 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
|
346 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
|
347 } |
8dee38ea9117
nginx-0.0.1-2003-11-25-23:44:56 import
Igor Sysoev <igor@sysoev.ru>
parents:
97
diff
changeset
|
348 |
8dee38ea9117
nginx-0.0.1-2003-11-25-23:44:56 import
Igor Sysoev <igor@sysoev.ru>
parents:
97
diff
changeset
|
349 continue; |
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 |
344
e366ba5db8f8
nginx-0.0.3-2004-06-01-10:04:46 import
Igor Sysoev <igor@sysoev.ru>
parents:
343
diff
changeset
|
352 if (ngx_buf_in_memory(cl->buf)) { |
473 | 353 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
|
354 } |
8dee38ea9117
nginx-0.0.1-2003-11-25-23:44:56 import
Igor Sysoev <igor@sysoev.ru>
parents:
97
diff
changeset
|
355 |
344
e366ba5db8f8
nginx-0.0.3-2004-06-01-10:04:46 import
Igor Sysoev <igor@sysoev.ru>
parents:
343
diff
changeset
|
356 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
|
357 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
|
358 } |
8dee38ea9117
nginx-0.0.1-2003-11-25-23:44:56 import
Igor Sysoev <igor@sysoev.ru>
parents:
97
diff
changeset
|
359 |
8dee38ea9117
nginx-0.0.1-2003-11-25-23:44:56 import
Igor Sysoev <igor@sysoev.ru>
parents:
97
diff
changeset
|
360 break; |
97
70d2345a903f
nginx-0.0.1-2003-05-29-17:02:09 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
361 } |
70d2345a903f
nginx-0.0.1-2003-05-29-17:02:09 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
362 |
362
7650aea1816f
nginx-0.0.7-2004-06-21-19:59:32 import
Igor Sysoev <igor@sysoev.ru>
parents:
344
diff
changeset
|
363 if (eintr) { |
577 | 364 continue; |
362
7650aea1816f
nginx-0.0.7-2004-06-21-19:59:32 import
Igor Sysoev <igor@sysoev.ru>
parents:
344
diff
changeset
|
365 } |
195
8dee38ea9117
nginx-0.0.1-2003-11-25-23:44:56 import
Igor Sysoev <igor@sysoev.ru>
parents:
97
diff
changeset
|
366 |
577 | 367 if (!complete) { |
362
7650aea1816f
nginx-0.0.7-2004-06-21-19:59:32 import
Igor Sysoev <igor@sysoev.ru>
parents:
344
diff
changeset
|
368 wev->ready = 0; |
7650aea1816f
nginx-0.0.7-2004-06-21-19:59:32 import
Igor Sysoev <igor@sysoev.ru>
parents:
344
diff
changeset
|
369 return cl; |
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 |
7650aea1816f
nginx-0.0.7-2004-06-21-19:59:32 import
Igor Sysoev <igor@sysoev.ru>
parents:
344
diff
changeset
|
372 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
|
373 return cl; |
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 |
7650aea1816f
nginx-0.0.7-2004-06-21-19:59:32 import
Igor Sysoev <igor@sysoev.ru>
parents:
344
diff
changeset
|
376 in = cl; |
97
70d2345a903f
nginx-0.0.1-2003-05-29-17:02:09 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
377 } |
70d2345a903f
nginx-0.0.1-2003-05-29-17:02:09 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
378 } |