Mercurial > hg > nginx
annotate src/os/unix/ngx_linux_sendfile_chain.c @ 6791:cb4a4e9bba8e
Perl: fixed optimization in SSI command handler.
As the pointer to the first argument was tested instead of the argument
itself, array of arguments was always created, even if there were no
arguments. Fix is to test args[0] instead of args.
Found by Coverity (CID 1356862).
author | Maxim Dounin <mdounin@mdounin.ru> |
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date | Tue, 01 Nov 2016 20:39:21 +0300 |
parents | f01ab2dbcfdc |
children | ff0c8e11edbc |
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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12 |
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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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15 |
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16 #if (NGX_THREADS) |
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17 #include <ngx_thread_pool.h> |
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18 |
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19 #if !(NGX_HAVE_SENDFILE64) |
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20 #error sendfile64() is required! |
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21 #endif |
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22 |
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23 static ngx_int_t ngx_linux_sendfile_thread(ngx_connection_t *c, ngx_buf_t *file, |
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24 size_t size, size_t *sent); |
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25 static void ngx_linux_sendfile_thread_handler(void *data, ngx_log_t *log); |
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26 #endif |
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27 |
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29 /* |
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30 * On Linux up to 2.4.21 sendfile() (syscall #187) works with 32-bit |
479 | 31 * offsets only, and the including <sys/sendfile.h> breaks the compiling, |
32 * if off_t is 64 bit wide. So we use own sendfile() definition, where offset | |
33 * parameter is int32_t, and use sendfile() for the file parts below 2G only, | |
34 * see src/os/unix/ngx_linux_config.h | |
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35 * |
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36 * Linux 2.4.21 has the new sendfile64() syscall #239. |
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37 * |
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38 * On Linux up to 2.6.16 sendfile() does not allow to pass the count parameter |
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39 * more than 2G-1 bytes even on 64-bit platforms: it returns EINVAL, |
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40 * so we limit it to 2G-1 bytes. |
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41 */ |
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42 |
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43 #define NGX_SENDFILE_MAXSIZE 2147483647L |
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45 |
585 | 46 ngx_chain_t * |
47 ngx_linux_sendfile_chain(ngx_connection_t *c, ngx_chain_t *in, off_t limit) | |
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48 { |
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49 int tcp_nodelay; |
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50 off_t send, prev_send; |
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51 size_t file_size, sent; |
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52 ssize_t n; |
589 | 53 ngx_err_t err; |
54 ngx_buf_t *file; | |
55 ngx_event_t *wev; | |
56 ngx_chain_t *cl; | |
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57 ngx_iovec_t header; |
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58 struct iovec headers[NGX_IOVS_PREALLOCATE]; |
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59 #if (NGX_THREADS) |
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60 ngx_int_t rc; |
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61 ngx_uint_t thread_handled, thread_complete; |
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62 #endif |
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63 |
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64 wev = c->write; |
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65 |
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66 if (!wev->ready) { |
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67 return in; |
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68 } |
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69 |
473 | 70 |
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71 /* the maximum limit size is 2G-1 - the page size */ |
473 | 72 |
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73 if (limit == 0 || limit > (off_t) (NGX_SENDFILE_MAXSIZE - ngx_pagesize)) { |
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74 limit = NGX_SENDFILE_MAXSIZE - ngx_pagesize; |
473 | 75 } |
76 | |
77 | |
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78 send = 0; |
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79 |
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80 header.iovs = headers; |
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81 header.nalloc = NGX_IOVS_PREALLOCATE; |
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82 |
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83 for ( ;; ) { |
473 | 84 prev_send = send; |
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85 #if (NGX_THREADS) |
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86 thread_handled = 0; |
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87 thread_complete = 0; |
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88 #endif |
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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 cl = ngx_output_chain_to_iovec(&header, in, limit - send, c->log); |
479 | 93 |
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94 if (cl == NGX_CHAIN_ERROR) { |
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95 return NGX_CHAIN_ERROR; |
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96 } |
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98 send += header.size; |
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99 |
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100 /* set TCP_CORK if there is a header before a file */ |
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101 |
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102 if (c->tcp_nopush == NGX_TCP_NOPUSH_UNSET |
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103 && header.count != 0 |
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104 && cl |
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105 && cl->buf->in_file) |
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106 { |
473 | 107 /* the TCP_CORK and TCP_NODELAY are mutually exclusive */ |
108 | |
483 | 109 if (c->tcp_nodelay == NGX_TCP_NODELAY_SET) { |
473 | 110 |
111 tcp_nodelay = 0; | |
112 | |
113 if (setsockopt(c->fd, IPPROTO_TCP, TCP_NODELAY, | |
114 (const void *) &tcp_nodelay, sizeof(int)) == -1) | |
115 { | |
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116 err = ngx_socket_errno; |
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117 |
473 | 118 /* |
479 | 119 * there is a tiny chance to be interrupted, however, |
473 | 120 * we continue a processing with the TCP_NODELAY |
121 * and without the TCP_CORK | |
122 */ | |
123 | |
577 | 124 if (err != NGX_EINTR) { |
473 | 125 wev->error = 1; |
483 | 126 ngx_connection_error(c, err, |
473 | 127 "setsockopt(TCP_NODELAY) failed"); |
128 return NGX_CHAIN_ERROR; | |
129 } | |
130 | |
131 } else { | |
483 | 132 c->tcp_nodelay = NGX_TCP_NODELAY_UNSET; |
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133 |
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134 ngx_log_debug0(NGX_LOG_DEBUG_EVENT, c->log, 0, |
473 | 135 "no tcp_nodelay"); |
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136 } |
473 | 137 } |
138 | |
483 | 139 if (c->tcp_nodelay == NGX_TCP_NODELAY_UNSET) { |
473 | 140 |
141 if (ngx_tcp_nopush(c->fd) == NGX_ERROR) { | |
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142 err = ngx_socket_errno; |
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143 |
473 | 144 /* |
479 | 145 * there is a tiny chance to be interrupted, however, |
473 | 146 * we continue a processing without the TCP_CORK |
147 */ | |
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148 |
577 | 149 if (err != NGX_EINTR) { |
473 | 150 wev->error = 1; |
151 ngx_connection_error(c, err, | |
152 ngx_tcp_nopush_n " failed"); | |
153 return NGX_CHAIN_ERROR; | |
154 } | |
155 | |
156 } else { | |
157 c->tcp_nopush = NGX_TCP_NOPUSH_SET; | |
577 | 158 |
473 | 159 ngx_log_debug0(NGX_LOG_DEBUG_EVENT, c->log, 0, |
160 "tcp_nopush"); | |
161 } | |
97
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162 } |
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163 } |
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164 |
362
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165 /* get the file buf */ |
97
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166 |
5913
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167 if (header.count == 0 && cl && cl->buf->in_file && send < limit) { |
344
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168 file = cl->buf; |
97
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169 |
344
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|
170 /* coalesce the neighbouring file bufs */ |
97
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171 |
5915
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Moved the code for coalescing file buffers to a separate function.
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172 file_size = (size_t) ngx_chain_coalesce_file(&cl, limit - send); |
362
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173 |
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174 send += file_size; |
589 | 175 #if 1 |
176 if (file_size == 0) { | |
177 ngx_debug_point(); | |
178 return NGX_CHAIN_ERROR; | |
179 } | |
180 #endif | |
6023
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181 |
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182 #if (NGX_THREADS) |
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183 if (file->file->thread_handler) { |
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184 rc = ngx_linux_sendfile_thread(c, file, file_size, &sent); |
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185 |
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186 switch (rc) { |
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187 case NGX_OK: |
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188 thread_handled = 1; |
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189 break; |
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190 |
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191 case NGX_DONE: |
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192 thread_complete = 1; |
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193 break; |
195
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194 |
6023
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195 case NGX_AGAIN: |
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196 break; |
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197 |
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198 default: /* NGX_ERROR */ |
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199 return NGX_CHAIN_ERROR; |
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200 } |
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201 |
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202 } else |
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203 #endif |
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204 { |
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205 n = ngx_linux_sendfile(c, file, file_size); |
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206 |
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207 if (n == NGX_ERROR) { |
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208 return NGX_CHAIN_ERROR; |
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209 } |
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210 |
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|
211 sent = (n == NGX_AGAIN) ? 0 : n; |
195
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97
diff
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212 } |
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97
diff
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|
213 |
8dee38ea9117
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97
diff
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|
214 } else { |
5917
2c64b69daec5
Moved writev() handling code to a separate function.
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diff
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|
215 n = ngx_writev(c, &header); |
253
b6793bc5034b
nginx-0.0.2-2004-02-09-10:46:43 import
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parents:
247
diff
changeset
|
216 |
5917
2c64b69daec5
Moved writev() handling code to a separate function.
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diff
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|
217 if (n == NGX_ERROR) { |
2c64b69daec5
Moved writev() handling code to a separate function.
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|
218 return NGX_CHAIN_ERROR; |
97
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diff
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|
219 } |
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|
220 |
5917
2c64b69daec5
Moved writev() handling code to a separate function.
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5916
diff
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|
221 sent = (n == NGX_AGAIN) ? 0 : n; |
97
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diff
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|
222 } |
70d2345a903f
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|
223 |
195
8dee38ea9117
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97
diff
changeset
|
224 c->sent += sent; |
8dee38ea9117
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97
diff
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|
225 |
5912
de68ed551bfb
Renamed ngx_handle_sent_chain() to ngx_chain_update_sent().
Valentin Bartenev <vbart@nginx.com>
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5868
diff
changeset
|
226 in = ngx_chain_update_sent(in, sent); |
97
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227 |
6023
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228 if ((size_t) (send - prev_send) != sent) { |
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|
229 #if (NGX_THREADS) |
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230 if (thread_handled) { |
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|
231 return in; |
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|
232 } |
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233 |
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|
234 if (thread_complete) { |
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235 send = prev_send + sent; |
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|
236 continue; |
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|
237 } |
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|
238 #endif |
362
7650aea1816f
nginx-0.0.7-2004-06-21-19:59:32 import
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344
diff
changeset
|
239 wev->ready = 0; |
5320
ad137a80919f
Don't lose pointer to first nonempty buf in ngx_*_sendfile_chain().
Gleb Smirnoff <glebius@nginx.com>
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5222
diff
changeset
|
240 return in; |
362
7650aea1816f
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344
diff
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|
241 } |
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nginx-0.0.7-2004-06-21-19:59:32 import
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344
diff
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|
242 |
5320
ad137a80919f
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parents:
5222
diff
changeset
|
243 if (send >= limit || in == NULL) { |
ad137a80919f
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5222
diff
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|
244 return in; |
362
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344
diff
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|
245 } |
97
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|
246 } |
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|
247 } |
5997
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|
248 |
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|
249 |
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|
250 static ssize_t |
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|
251 ngx_linux_sendfile(ngx_connection_t *c, ngx_buf_t *file, size_t size) |
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252 { |
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253 #if (NGX_HAVE_SENDFILE64) |
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254 off_t offset; |
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255 #else |
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|
256 int32_t offset; |
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|
257 #endif |
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258 ssize_t n; |
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259 ngx_err_t err; |
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260 |
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261 #if (NGX_HAVE_SENDFILE64) |
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|
262 offset = file->file_pos; |
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|
263 #else |
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|
264 offset = (int32_t) file->file_pos; |
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265 #endif |
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266 |
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267 eintr: |
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268 |
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269 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, c->log, 0, |
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270 "sendfile: @%O %uz", file->file_pos, size); |
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271 |
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272 n = sendfile(c->fd, file->file->fd, &offset, size); |
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273 |
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274 if (n == -1) { |
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|
275 err = ngx_errno; |
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276 |
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|
277 switch (err) { |
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|
278 case NGX_EAGAIN: |
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5918
diff
changeset
|
279 ngx_log_debug0(NGX_LOG_DEBUG_EVENT, c->log, err, |
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280 "sendfile() is not ready"); |
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281 return NGX_AGAIN; |
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282 |
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283 case NGX_EINTR: |
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284 ngx_log_debug0(NGX_LOG_DEBUG_EVENT, c->log, err, |
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285 "sendfile() was interrupted"); |
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|
286 goto eintr; |
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287 |
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288 default: |
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289 c->write->error = 1; |
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290 ngx_connection_error(c, err, "sendfile() failed"); |
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291 return NGX_ERROR; |
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292 } |
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293 } |
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294 |
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295 if (n == 0) { |
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296 /* |
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297 * if sendfile returns zero, then someone has truncated the file, |
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298 * so the offset became beyond the end of the file |
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299 */ |
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300 |
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301 ngx_log_error(NGX_LOG_ALERT, c->log, 0, |
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302 "sendfile() reported that \"%s\" was truncated at %O", |
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303 file->file->name.data, file->file_pos); |
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304 |
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305 return NGX_ERROR; |
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|
306 } |
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307 |
5997
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308 ngx_log_debug3(NGX_LOG_DEBUG_EVENT, c->log, 0, "sendfile: %z of %uz @%O", |
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|
309 n, size, file->file_pos); |
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310 |
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|
311 return n; |
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|
312 } |
6023
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313 |
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314 |
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|
315 #if (NGX_THREADS) |
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316 |
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changeset
|
317 typedef struct { |
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|
318 ngx_buf_t *file; |
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|
319 ngx_socket_t socket; |
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|
320 size_t size; |
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|
321 |
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changeset
|
322 size_t sent; |
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|
323 ngx_err_t err; |
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|
324 } ngx_linux_sendfile_ctx_t; |
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325 |
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326 |
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|
327 static ngx_int_t |
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|
328 ngx_linux_sendfile_thread(ngx_connection_t *c, ngx_buf_t *file, size_t size, |
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|
329 size_t *sent) |
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330 { |
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|
331 ngx_event_t *wev; |
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|
332 ngx_thread_task_t *task; |
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|
333 ngx_linux_sendfile_ctx_t *ctx; |
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|
334 |
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|
335 ngx_log_debug3(NGX_LOG_DEBUG_CORE, c->log, 0, |
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336 "linux sendfile thread: %d, %uz, %O", |
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|
337 file->file->fd, size, file->file_pos); |
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|
338 |
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|
339 task = c->sendfile_task; |
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|
340 |
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|
341 if (task == NULL) { |
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|
342 task = ngx_thread_task_alloc(c->pool, sizeof(ngx_linux_sendfile_ctx_t)); |
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|
343 if (task == NULL) { |
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|
344 return NGX_ERROR; |
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|
345 } |
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|
346 |
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|
347 task->handler = ngx_linux_sendfile_thread_handler; |
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348 |
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|
349 c->sendfile_task = task; |
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|
350 } |
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|
351 |
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changeset
|
352 ctx = task->ctx; |
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|
353 wev = c->write; |
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|
354 |
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changeset
|
355 if (task->event.complete) { |
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changeset
|
356 task->event.complete = 0; |
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|
357 |
6431
3b9c6b91d988
Fixed handling of EAGAIN with sendfile in threads.
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diff
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|
358 if (ctx->err == NGX_EAGAIN) { |
3b9c6b91d988
Fixed handling of EAGAIN with sendfile in threads.
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parents:
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changeset
|
359 *sent = 0; |
6440
248aa2757332
Fixed timeouts with threaded sendfile() and subrequests.
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|
360 |
248aa2757332
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changeset
|
361 if (wev->complete) { |
248aa2757332
Fixed timeouts with threaded sendfile() and subrequests.
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|
362 return NGX_DONE; |
248aa2757332
Fixed timeouts with threaded sendfile() and subrequests.
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diff
changeset
|
363 } |
248aa2757332
Fixed timeouts with threaded sendfile() and subrequests.
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parents:
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diff
changeset
|
364 |
6431
3b9c6b91d988
Fixed handling of EAGAIN with sendfile in threads.
Valentin Bartenev <vbart@nginx.com>
parents:
6422
diff
changeset
|
365 return NGX_AGAIN; |
3b9c6b91d988
Fixed handling of EAGAIN with sendfile in threads.
Valentin Bartenev <vbart@nginx.com>
parents:
6422
diff
changeset
|
366 } |
3b9c6b91d988
Fixed handling of EAGAIN with sendfile in threads.
Valentin Bartenev <vbart@nginx.com>
parents:
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diff
changeset
|
367 |
3b9c6b91d988
Fixed handling of EAGAIN with sendfile in threads.
Valentin Bartenev <vbart@nginx.com>
parents:
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diff
changeset
|
368 if (ctx->err) { |
6023
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diff
changeset
|
369 wev->error = 1; |
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diff
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|
370 ngx_connection_error(c, ctx->err, "sendfile() failed"); |
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|
371 return NGX_ERROR; |
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|
372 } |
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Added support for offloading Linux sendfile() in thread pools.
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changeset
|
373 |
6437
4df3d9fcdee8
Truncation detection in sendfile() on Linux.
Maxim Dounin <mdounin@mdounin.ru>
parents:
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diff
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|
374 if (ctx->sent == 0) { |
4df3d9fcdee8
Truncation detection in sendfile() on Linux.
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|
375 /* |
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Truncation detection in sendfile() on Linux.
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|
376 * if sendfile returns zero, then someone has truncated the file, |
4df3d9fcdee8
Truncation detection in sendfile() on Linux.
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|
377 * so the offset became beyond the end of the file |
4df3d9fcdee8
Truncation detection in sendfile() on Linux.
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diff
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|
378 */ |
4df3d9fcdee8
Truncation detection in sendfile() on Linux.
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changeset
|
379 |
4df3d9fcdee8
Truncation detection in sendfile() on Linux.
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changeset
|
380 ngx_log_error(NGX_LOG_ALERT, c->log, 0, |
4df3d9fcdee8
Truncation detection in sendfile() on Linux.
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|
381 "sendfile() reported that \"%s\" was truncated at %O", |
4df3d9fcdee8
Truncation detection in sendfile() on Linux.
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|
382 file->file->name.data, file->file_pos); |
4df3d9fcdee8
Truncation detection in sendfile() on Linux.
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diff
changeset
|
383 |
4df3d9fcdee8
Truncation detection in sendfile() on Linux.
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diff
changeset
|
384 return NGX_ERROR; |
4df3d9fcdee8
Truncation detection in sendfile() on Linux.
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diff
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|
385 } |
4df3d9fcdee8
Truncation detection in sendfile() on Linux.
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parents:
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diff
changeset
|
386 |
6023
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|
387 *sent = ctx->sent; |
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|
388 |
6440
248aa2757332
Fixed timeouts with threaded sendfile() and subrequests.
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|
389 if (ctx->sent == ctx->size || wev->complete) { |
248aa2757332
Fixed timeouts with threaded sendfile() and subrequests.
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|
390 return NGX_DONE; |
248aa2757332
Fixed timeouts with threaded sendfile() and subrequests.
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diff
changeset
|
391 } |
248aa2757332
Fixed timeouts with threaded sendfile() and subrequests.
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diff
changeset
|
392 |
248aa2757332
Fixed timeouts with threaded sendfile() and subrequests.
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diff
changeset
|
393 return NGX_AGAIN; |
6023
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diff
changeset
|
394 } |
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Added support for offloading Linux sendfile() in thread pools.
Valentin Bartenev <vbart@nginx.com>
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diff
changeset
|
395 |
6422
768e287a6f36
Fixed sendfile in threads (or with aio preload) and subrequests.
Maxim Dounin <mdounin@mdounin.ru>
parents:
6023
diff
changeset
|
396 if (task->event.active && ctx->file == file) { |
768e287a6f36
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397 /* |
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398 * tolerate duplicate calls; they can happen due to subrequests |
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399 * or multiple calls of the next body filter from a filter |
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400 */ |
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401 |
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402 *sent = 0; |
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403 |
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404 return NGX_OK; |
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405 } |
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406 |
6023
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407 ctx->file = file; |
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408 ctx->socket = c->fd; |
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409 ctx->size = size; |
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410 |
6440
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411 wev->complete = 0; |
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412 |
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413 if (file->file->thread_handler(task, file->file) != NGX_OK) { |
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414 return NGX_ERROR; |
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415 } |
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416 |
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417 *sent = 0; |
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418 |
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419 return NGX_OK; |
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420 } |
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421 |
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422 |
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423 static void |
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424 ngx_linux_sendfile_thread_handler(void *data, ngx_log_t *log) |
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425 { |
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426 ngx_linux_sendfile_ctx_t *ctx = data; |
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427 |
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428 off_t offset; |
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429 ssize_t n; |
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430 ngx_buf_t *file; |
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431 |
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432 ngx_log_debug0(NGX_LOG_DEBUG_CORE, log, 0, "linux sendfile thread handler"); |
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433 |
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434 file = ctx->file; |
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435 offset = file->file_pos; |
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436 |
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437 again: |
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438 |
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439 n = sendfile(ctx->socket, file->file->fd, &offset, ctx->size); |
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440 |
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441 if (n == -1) { |
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442 ctx->err = ngx_errno; |
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443 |
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444 } else { |
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445 ctx->sent = n; |
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446 ctx->err = 0; |
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447 } |
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448 |
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449 #if 0 |
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450 ngx_time_update(); |
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451 #endif |
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452 |
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453 ngx_log_debug4(NGX_LOG_DEBUG_EVENT, log, 0, |
6480 | 454 "sendfile: %z (err: %d) of %uz @%O", |
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455 n, ctx->err, ctx->size, file->file_pos); |
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456 |
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457 if (ctx->err == NGX_EINTR) { |
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458 goto again; |
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459 } |
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460 } |
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461 |
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462 #endif /* NGX_THREADS */ |