Mercurial > hg > nginx-quic
annotate src/os/unix/ngx_linux_sendfile_chain.c @ 4448:539355d9e675 stable-1.0
Merge of r4404:
Fixed sched_setaffinity(2) to correctly pass size.
Second argument (cpusetsize) is size in bytes, not in bits. Previously
used constant 32 resulted in reading of uninitialized memory and caused
EINVAL to be returned on some Linux kernels.
author | Maxim Dounin <mdounin@mdounin.ru> |
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date | Sun, 05 Feb 2012 19:25:24 +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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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; |
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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 |
344
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parents:
343
diff
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|
152 && cl->buf->in_file) |
195
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diff
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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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247
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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344
diff
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212 /* get the file buf */ |
97
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parents:
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213 |
362
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344
diff
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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) |
1182
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226 & ~((off_t) ngx_pagesize - 1); |
362
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parents:
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; |
7650aea1816f
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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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344
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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344
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241 && file->file->fd == cl->buf->file->fd |
7650aea1816f
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344
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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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nginx-0.0.1-2003-11-26-18:42:18 import
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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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parents:
196
diff
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|
255 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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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; |
8dee38ea9117
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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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247
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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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247
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275 wev->error = 1; |
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247
diff
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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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247
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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diff
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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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diff
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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
70d2345a903f
nginx-0.0.1-2003-05-29-17:02:09 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
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 } |