Mercurial > hg > nginx-quic
annotate src/os/unix/ngx_linux_sendfile_chain.c @ 6018:466bd63b63d1
Thread pools implementation.
author | Valentin Bartenev <vbart@nginx.com> |
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date | Sat, 14 Mar 2015 17:37:07 +0300 |
parents | c901f2764c27 |
children | b550563ef96e |
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 static ssize_t ngx_linux_sendfile(ngx_connection_t *c, ngx_buf_t *file, |
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14 size_t size); |
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16 |
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17 /* |
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18 * On Linux up to 2.4.21 sendfile() (syscall #187) works with 32-bit |
479 | 19 * offsets only, and the including <sys/sendfile.h> breaks the compiling, |
20 * if off_t is 64 bit wide. So we use own sendfile() definition, where offset | |
21 * parameter is int32_t, and use sendfile() for the file parts below 2G only, | |
22 * see src/os/unix/ngx_linux_config.h | |
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23 * |
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24 * Linux 2.4.21 has the new sendfile64() syscall #239. |
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25 * |
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26 * On Linux up to 2.6.16 sendfile() does not allow to pass the count parameter |
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27 * more than 2G-1 bytes even on 64-bit platforms: it returns EINVAL, |
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28 * so we limit it to 2G-1 bytes. |
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29 */ |
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30 |
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31 #define NGX_SENDFILE_MAXSIZE 2147483647L |
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32 |
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33 |
585 | 34 ngx_chain_t * |
35 ngx_linux_sendfile_chain(ngx_connection_t *c, ngx_chain_t *in, off_t limit) | |
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36 { |
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37 int tcp_nodelay; |
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38 off_t send, prev_send, sent; |
589 | 39 size_t file_size; |
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40 ssize_t n; |
589 | 41 ngx_err_t err; |
42 ngx_buf_t *file; | |
43 ngx_event_t *wev; | |
44 ngx_chain_t *cl; | |
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45 ngx_iovec_t header; |
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46 struct iovec headers[NGX_IOVS_PREALLOCATE]; |
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47 |
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48 wev = c->write; |
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49 |
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50 if (!wev->ready) { |
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51 return in; |
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52 } |
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53 |
473 | 54 |
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55 /* the maximum limit size is 2G-1 - the page size */ |
473 | 56 |
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57 if (limit == 0 || limit > (off_t) (NGX_SENDFILE_MAXSIZE - ngx_pagesize)) { |
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58 limit = NGX_SENDFILE_MAXSIZE - ngx_pagesize; |
473 | 59 } |
60 | |
61 | |
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62 send = 0; |
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63 |
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64 header.iovs = headers; |
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65 header.nalloc = NGX_IOVS_PREALLOCATE; |
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66 |
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67 for ( ;; ) { |
473 | 68 prev_send = send; |
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69 |
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70 /* create the iovec and coalesce the neighbouring bufs */ |
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71 |
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72 cl = ngx_output_chain_to_iovec(&header, in, limit - send, c->log); |
479 | 73 |
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74 if (cl == NGX_CHAIN_ERROR) { |
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75 return NGX_CHAIN_ERROR; |
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76 } |
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77 |
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78 send += header.size; |
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79 |
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80 /* set TCP_CORK if there is a header before a file */ |
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81 |
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82 if (c->tcp_nopush == NGX_TCP_NOPUSH_UNSET |
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83 && header.count != 0 |
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84 && cl |
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85 && cl->buf->in_file) |
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86 { |
473 | 87 /* the TCP_CORK and TCP_NODELAY are mutually exclusive */ |
88 | |
483 | 89 if (c->tcp_nodelay == NGX_TCP_NODELAY_SET) { |
473 | 90 |
91 tcp_nodelay = 0; | |
92 | |
93 if (setsockopt(c->fd, IPPROTO_TCP, TCP_NODELAY, | |
94 (const void *) &tcp_nodelay, sizeof(int)) == -1) | |
95 { | |
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96 err = ngx_socket_errno; |
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97 |
473 | 98 /* |
479 | 99 * there is a tiny chance to be interrupted, however, |
473 | 100 * we continue a processing with the TCP_NODELAY |
101 * and without the TCP_CORK | |
102 */ | |
103 | |
577 | 104 if (err != NGX_EINTR) { |
473 | 105 wev->error = 1; |
483 | 106 ngx_connection_error(c, err, |
473 | 107 "setsockopt(TCP_NODELAY) failed"); |
108 return NGX_CHAIN_ERROR; | |
109 } | |
110 | |
111 } else { | |
483 | 112 c->tcp_nodelay = NGX_TCP_NODELAY_UNSET; |
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113 |
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114 ngx_log_debug0(NGX_LOG_DEBUG_EVENT, c->log, 0, |
473 | 115 "no tcp_nodelay"); |
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116 } |
473 | 117 } |
118 | |
483 | 119 if (c->tcp_nodelay == NGX_TCP_NODELAY_UNSET) { |
473 | 120 |
121 if (ngx_tcp_nopush(c->fd) == NGX_ERROR) { | |
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122 err = ngx_socket_errno; |
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123 |
473 | 124 /* |
479 | 125 * there is a tiny chance to be interrupted, however, |
473 | 126 * we continue a processing without the TCP_CORK |
127 */ | |
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128 |
577 | 129 if (err != NGX_EINTR) { |
473 | 130 wev->error = 1; |
131 ngx_connection_error(c, err, | |
132 ngx_tcp_nopush_n " failed"); | |
133 return NGX_CHAIN_ERROR; | |
134 } | |
135 | |
136 } else { | |
137 c->tcp_nopush = NGX_TCP_NOPUSH_SET; | |
577 | 138 |
473 | 139 ngx_log_debug0(NGX_LOG_DEBUG_EVENT, c->log, 0, |
140 "tcp_nopush"); | |
141 } | |
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142 } |
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143 } |
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144 |
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145 /* get the file buf */ |
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146 |
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147 if (header.count == 0 && cl && cl->buf->in_file && send < limit) { |
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148 file = cl->buf; |
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149 |
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150 /* coalesce the neighbouring file bufs */ |
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151 |
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152 file_size = (size_t) ngx_chain_coalesce_file(&cl, limit - send); |
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153 |
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154 send += file_size; |
589 | 155 #if 1 |
156 if (file_size == 0) { | |
157 ngx_debug_point(); | |
158 return NGX_CHAIN_ERROR; | |
159 } | |
160 #endif | |
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161 n = ngx_linux_sendfile(c, file, file_size); |
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162 |
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163 if (n == NGX_ERROR) { |
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164 return NGX_CHAIN_ERROR; |
195
8dee38ea9117
nginx-0.0.1-2003-11-25-23:44:56 import
Igor Sysoev <igor@sysoev.ru>
parents:
97
diff
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|
165 } |
8dee38ea9117
nginx-0.0.1-2003-11-25-23:44:56 import
Igor Sysoev <igor@sysoev.ru>
parents:
97
diff
changeset
|
166 |
5997
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167 sent = (n == NGX_AGAIN) ? 0 : n; |
253
b6793bc5034b
nginx-0.0.2-2004-02-09-10:46:43 import
Igor Sysoev <igor@sysoev.ru>
parents:
247
diff
changeset
|
168 |
195
8dee38ea9117
nginx-0.0.1-2003-11-25-23:44:56 import
Igor Sysoev <igor@sysoev.ru>
parents:
97
diff
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|
169 } else { |
5917
2c64b69daec5
Moved writev() handling code to a separate function.
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170 n = ngx_writev(c, &header); |
253
b6793bc5034b
nginx-0.0.2-2004-02-09-10:46:43 import
Igor Sysoev <igor@sysoev.ru>
parents:
247
diff
changeset
|
171 |
5917
2c64b69daec5
Moved writev() handling code to a separate function.
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diff
changeset
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172 if (n == NGX_ERROR) { |
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173 return NGX_CHAIN_ERROR; |
97
70d2345a903f
nginx-0.0.1-2003-05-29-17:02:09 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
174 } |
70d2345a903f
nginx-0.0.1-2003-05-29-17:02:09 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
175 |
5917
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diff
changeset
|
176 sent = (n == NGX_AGAIN) ? 0 : n; |
97
70d2345a903f
nginx-0.0.1-2003-05-29-17:02:09 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
177 } |
70d2345a903f
nginx-0.0.1-2003-05-29-17:02:09 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
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|
178 |
195
8dee38ea9117
nginx-0.0.1-2003-11-25-23:44:56 import
Igor Sysoev <igor@sysoev.ru>
parents:
97
diff
changeset
|
179 c->sent += sent; |
8dee38ea9117
nginx-0.0.1-2003-11-25-23:44:56 import
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parents:
97
diff
changeset
|
180 |
5912
de68ed551bfb
Renamed ngx_handle_sent_chain() to ngx_chain_update_sent().
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5868
diff
changeset
|
181 in = ngx_chain_update_sent(in, sent); |
97
70d2345a903f
nginx-0.0.1-2003-05-29-17:02:09 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
182 |
5851
150df089fe47
Removed the "complete" variable from various send chain functions.
Valentin Bartenev <vbart@nginx.com>
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5850
diff
changeset
|
183 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
|
184 wev->ready = 0; |
5320
ad137a80919f
Don't lose pointer to first nonempty buf in ngx_*_sendfile_chain().
Gleb Smirnoff <glebius@nginx.com>
parents:
5222
diff
changeset
|
185 return in; |
362
7650aea1816f
nginx-0.0.7-2004-06-21-19:59:32 import
Igor Sysoev <igor@sysoev.ru>
parents:
344
diff
changeset
|
186 } |
7650aea1816f
nginx-0.0.7-2004-06-21-19:59:32 import
Igor Sysoev <igor@sysoev.ru>
parents:
344
diff
changeset
|
187 |
5320
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diff
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188 if (send >= limit || in == NULL) { |
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parents:
5222
diff
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189 return in; |
362
7650aea1816f
nginx-0.0.7-2004-06-21-19:59:32 import
Igor Sysoev <igor@sysoev.ru>
parents:
344
diff
changeset
|
190 } |
97
70d2345a903f
nginx-0.0.1-2003-05-29-17:02:09 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
191 } |
70d2345a903f
nginx-0.0.1-2003-05-29-17:02:09 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
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|
192 } |
5997
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diff
changeset
|
193 |
c901f2764c27
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parents:
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194 |
c901f2764c27
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195 static ssize_t |
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196 ngx_linux_sendfile(ngx_connection_t *c, ngx_buf_t *file, size_t size) |
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197 { |
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198 #if (NGX_HAVE_SENDFILE64) |
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|
199 off_t offset; |
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200 #else |
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|
201 int32_t offset; |
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202 #endif |
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203 ssize_t n; |
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|
204 ngx_err_t err; |
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|
205 |
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diff
changeset
|
206 #if (NGX_HAVE_SENDFILE64) |
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|
207 offset = file->file_pos; |
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208 #else |
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|
209 offset = (int32_t) file->file_pos; |
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changeset
|
210 #endif |
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diff
changeset
|
211 |
c901f2764c27
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diff
changeset
|
212 eintr: |
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|
213 |
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214 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, c->log, 0, |
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|
215 "sendfile: @%O %uz", file->file_pos, size); |
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diff
changeset
|
216 |
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parents:
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diff
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|
217 n = sendfile(c->fd, file->file->fd, &offset, size); |
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|
218 |
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|
219 if (n == -1) { |
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diff
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|
220 err = ngx_errno; |
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diff
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|
221 |
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diff
changeset
|
222 switch (err) { |
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changeset
|
223 case NGX_EAGAIN: |
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|
224 ngx_log_debug0(NGX_LOG_DEBUG_EVENT, c->log, err, |
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parents:
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|
225 "sendfile() is not ready"); |
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|
226 return NGX_AGAIN; |
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diff
changeset
|
227 |
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diff
changeset
|
228 case NGX_EINTR: |
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|
229 ngx_log_debug0(NGX_LOG_DEBUG_EVENT, c->log, err, |
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changeset
|
230 "sendfile() was interrupted"); |
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diff
changeset
|
231 goto eintr; |
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diff
changeset
|
232 |
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diff
changeset
|
233 default: |
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diff
changeset
|
234 c->write->error = 1; |
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diff
changeset
|
235 ngx_connection_error(c, err, "sendfile() failed"); |
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|
236 return NGX_ERROR; |
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diff
changeset
|
237 } |
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Refactored ngx_linux_sendfile_chain() even more.
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parents:
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diff
changeset
|
238 } |
c901f2764c27
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parents:
5918
diff
changeset
|
239 |
c901f2764c27
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5918
diff
changeset
|
240 ngx_log_debug3(NGX_LOG_DEBUG_EVENT, c->log, 0, "sendfile: %z of %uz @%O", |
c901f2764c27
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parents:
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diff
changeset
|
241 n, size, file->file_pos); |
c901f2764c27
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parents:
5918
diff
changeset
|
242 |
c901f2764c27
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parents:
5918
diff
changeset
|
243 return n; |
c901f2764c27
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diff
changeset
|
244 } |