Mercurial > hg > nginx-quic
annotate src/os/unix/ngx_readv_chain.c @ 6963:3ff293cfdab8
Slice filter: prevented slice redirection (ticket #1219).
When a slice subrequest was redirected to a new location, its context was lost.
After its completion, a new slice subrequest for the same slice was created.
This could lead to infinite loop. Now the slice module makes sure each slice
subrequest starts output with the slice context available.
author | Roman Arutyunyan <arut@nginx.com> |
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date | Fri, 31 Mar 2017 21:47:56 +0300 |
parents | f7849bfb6d21 |
children | efd71d49bde0 |
rev | line source |
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441
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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. |
441
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5 */ |
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6 |
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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> |
73
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11 |
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12 |
501 | 13 ssize_t |
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14 ngx_readv_chain(ngx_connection_t *c, ngx_chain_t *chain, off_t limit) |
73
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15 { |
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16 u_char *prev; |
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17 ssize_t n, size; |
74
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18 ngx_err_t err; |
501 | 19 ngx_array_t vec; |
188
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20 ngx_event_t *rev; |
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21 struct iovec *iov, iovs[NGX_IOVS_PREALLOCATE]; |
188
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22 |
577 | 23 rev = c->read; |
188
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24 |
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25 #if (NGX_HAVE_KQUEUE) |
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26 |
455 | 27 if (ngx_event_flags & NGX_USE_KQUEUE_EVENT) { |
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28 ngx_log_debug3(NGX_LOG_DEBUG_EVENT, c->log, 0, |
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29 "readv: eof:%d, avail:%d, err:%d", |
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30 rev->pending_eof, rev->available, rev->kq_errno); |
188
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31 |
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32 if (rev->available == 0) { |
587 | 33 if (rev->pending_eof) { |
188
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34 rev->ready = 0; |
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35 rev->eof = 1; |
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36 |
587 | 37 ngx_log_error(NGX_LOG_INFO, c->log, rev->kq_errno, |
38 "kevent() reported about an closed connection"); | |
39 | |
188
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40 if (rev->kq_errno) { |
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41 rev->error = 1; |
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42 ngx_set_socket_errno(rev->kq_errno); |
587 | 43 return NGX_ERROR; |
188
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44 } |
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45 |
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46 return 0; |
587 | 47 |
48 } else { | |
49 return NGX_AGAIN; | |
188
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50 } |
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51 } |
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52 } |
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53 |
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54 #endif |
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55 |
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56 #if (NGX_HAVE_EPOLLRDHUP) |
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57 |
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58 if (ngx_event_flags & NGX_USE_EPOLL_EVENT) { |
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59 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, c->log, 0, |
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60 "readv: eof:%d, avail:%d", |
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61 rev->pending_eof, rev->available); |
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62 |
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63 if (!rev->available && !rev->pending_eof) { |
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64 return NGX_AGAIN; |
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65 } |
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66 } |
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67 |
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68 #endif |
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69 |
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70 prev = NULL; |
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71 iov = NULL; |
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72 size = 0; |
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73 |
501 | 74 vec.elts = iovs; |
75 vec.nelts = 0; | |
76 vec.size = sizeof(struct iovec); | |
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77 vec.nalloc = NGX_IOVS_PREALLOCATE; |
501 | 78 vec.pool = c->pool; |
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79 |
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80 /* coalesce the neighbouring bufs */ |
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81 |
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82 while (chain) { |
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83 n = chain->buf->end - chain->buf->last; |
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84 |
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85 if (limit) { |
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86 if (size >= limit) { |
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87 break; |
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88 } |
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89 |
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90 if (size + n > limit) { |
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91 n = (ssize_t) (limit - size); |
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92 } |
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93 } |
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94 |
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95 if (prev == chain->buf->last) { |
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96 iov->iov_len += n; |
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97 |
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98 } else { |
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99 if (vec.nelts >= IOV_MAX) { |
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100 break; |
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101 } |
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102 |
501 | 103 iov = ngx_array_push(&vec); |
104 if (iov == NULL) { | |
105 return NGX_ERROR; | |
106 } | |
107 | |
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108 iov->iov_base = (void *) chain->buf->last; |
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109 iov->iov_len = n; |
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110 } |
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111 |
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112 size += n; |
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113 prev = chain->buf->end; |
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114 chain = chain->next; |
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115 } |
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116 |
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117 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, c->log, 0, |
6480 | 118 "readv: %ui, last:%uz", vec.nelts, iov->iov_len); |
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119 |
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120 do { |
501 | 121 n = readv(c->fd, (struct iovec *) vec.elts, vec.nelts); |
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122 |
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123 if (n == 0) { |
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124 rev->ready = 0; |
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125 rev->eof = 1; |
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126 |
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127 #if (NGX_HAVE_KQUEUE) |
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128 |
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129 /* |
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130 * on FreeBSD readv() may return 0 on closed socket |
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131 * even if kqueue reported about available data |
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132 */ |
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133 |
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134 if (ngx_event_flags & NGX_USE_KQUEUE_EVENT) { |
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135 rev->available = 0; |
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136 } |
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137 |
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138 #endif |
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139 |
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140 return 0; |
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141 } |
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142 |
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143 if (n > 0) { |
5852
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144 |
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145 #if (NGX_HAVE_KQUEUE) |
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146 |
455 | 147 if (ngx_event_flags & NGX_USE_KQUEUE_EVENT) { |
188
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diff
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148 rev->available -= n; |
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149 |
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150 /* |
587 | 151 * rev->available may be negative here because some additional |
6506
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152 * bytes may be received between kevent() and readv() |
188
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nginx-0.0.1-2003-11-18-11:04:34 import
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diff
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153 */ |
163
fb61ba77beba
nginx-0.0.1-2003-10-28-18:45:41 import
Igor Sysoev <igor@sysoev.ru>
parents:
155
diff
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154 |
188
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nginx-0.0.1-2003-11-18-11:04:34 import
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parents:
164
diff
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155 if (rev->available <= 0) { |
375
744ccb59062d
nginx-0.0.7-2004-07-02-19:54:34 import
Igor Sysoev <igor@sysoev.ru>
parents:
343
diff
changeset
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156 if (!rev->pending_eof) { |
188
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nginx-0.0.1-2003-11-18-11:04:34 import
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diff
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157 rev->ready = 0; |
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158 } |
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diff
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159 |
6508
151fd02a4317
Simplified ngx_unix_recv() and ngx_readv_chain().
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160 rev->available = 0; |
188
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nginx-0.0.1-2003-11-18-11:04:34 import
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164
diff
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161 } |
73
4534060fde92
nginx-0.0.1-2003-04-10-19:08:54 import
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162 |
188
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nginx-0.0.1-2003-11-18-11:04:34 import
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diff
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163 return n; |
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nginx-0.0.1-2003-11-18-11:04:34 import
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164
diff
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164 } |
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nginx-0.0.1-2003-11-18-11:04:34 import
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diff
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165 |
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166 #endif |
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167 |
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Improved EPOLLRDHUP handling.
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168 #if (NGX_HAVE_EPOLLRDHUP) |
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169 |
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170 if ((ngx_event_flags & NGX_USE_EPOLL_EVENT) |
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171 && ngx_use_epoll_rdhup) |
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172 { |
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173 if (n < size) { |
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174 if (!rev->pending_eof) { |
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175 rev->ready = 0; |
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176 } |
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177 |
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178 rev->available = 0; |
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179 } |
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180 |
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181 return n; |
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182 } |
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183 |
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184 #endif |
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185 |
5267
13c006f0c40e
Events: honor NGX_USE_GREEDY_EVENT when kqueue support is enabled.
Valentin Bartenev <vbart@nginx.com>
parents:
4597
diff
changeset
|
186 if (n < size && !(ngx_event_flags & NGX_USE_GREEDY_EVENT)) { |
188
0061d1f0908d
nginx-0.0.1-2003-11-18-11:04:34 import
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164
diff
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187 rev->ready = 0; |
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164
diff
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|
188 } |
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nginx-0.0.1-2003-11-18-11:04:34 import
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164
diff
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|
189 |
0061d1f0908d
nginx-0.0.1-2003-11-18-11:04:34 import
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164
diff
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|
190 return n; |
73
4534060fde92
nginx-0.0.1-2003-04-10-19:08:54 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
191 } |
4534060fde92
nginx-0.0.1-2003-04-10-19:08:54 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
192 |
257
70e1c7d2b83d
nginx-0.0.2-2004-02-11-20:08:49 import
Igor Sysoev <igor@sysoev.ru>
parents:
188
diff
changeset
|
193 err = ngx_socket_errno; |
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nginx-0.0.2-2004-02-11-20:08:49 import
Igor Sysoev <igor@sysoev.ru>
parents:
188
diff
changeset
|
194 |
70e1c7d2b83d
nginx-0.0.2-2004-02-11-20:08:49 import
Igor Sysoev <igor@sysoev.ru>
parents:
188
diff
changeset
|
195 if (err == NGX_EAGAIN || err == NGX_EINTR) { |
70e1c7d2b83d
nginx-0.0.2-2004-02-11-20:08:49 import
Igor Sysoev <igor@sysoev.ru>
parents:
188
diff
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|
196 ngx_log_debug0(NGX_LOG_DEBUG_EVENT, c->log, err, |
70e1c7d2b83d
nginx-0.0.2-2004-02-11-20:08:49 import
Igor Sysoev <igor@sysoev.ru>
parents:
188
diff
changeset
|
197 "readv() not ready"); |
70e1c7d2b83d
nginx-0.0.2-2004-02-11-20:08:49 import
Igor Sysoev <igor@sysoev.ru>
parents:
188
diff
changeset
|
198 n = NGX_AGAIN; |
188
0061d1f0908d
nginx-0.0.1-2003-11-18-11:04:34 import
Igor Sysoev <igor@sysoev.ru>
parents:
164
diff
changeset
|
199 |
257
70e1c7d2b83d
nginx-0.0.2-2004-02-11-20:08:49 import
Igor Sysoev <igor@sysoev.ru>
parents:
188
diff
changeset
|
200 } else { |
70e1c7d2b83d
nginx-0.0.2-2004-02-11-20:08:49 import
Igor Sysoev <igor@sysoev.ru>
parents:
188
diff
changeset
|
201 n = ngx_connection_error(c, err, "readv() failed"); |
70e1c7d2b83d
nginx-0.0.2-2004-02-11-20:08:49 import
Igor Sysoev <igor@sysoev.ru>
parents:
188
diff
changeset
|
202 break; |
70e1c7d2b83d
nginx-0.0.2-2004-02-11-20:08:49 import
Igor Sysoev <igor@sysoev.ru>
parents:
188
diff
changeset
|
203 } |
188
0061d1f0908d
nginx-0.0.1-2003-11-18-11:04:34 import
Igor Sysoev <igor@sysoev.ru>
parents:
164
diff
changeset
|
204 |
257
70e1c7d2b83d
nginx-0.0.2-2004-02-11-20:08:49 import
Igor Sysoev <igor@sysoev.ru>
parents:
188
diff
changeset
|
205 } while (err == NGX_EINTR); |
188
0061d1f0908d
nginx-0.0.1-2003-11-18-11:04:34 import
Igor Sysoev <igor@sysoev.ru>
parents:
164
diff
changeset
|
206 |
0061d1f0908d
nginx-0.0.1-2003-11-18-11:04:34 import
Igor Sysoev <igor@sysoev.ru>
parents:
164
diff
changeset
|
207 rev->ready = 0; |
0061d1f0908d
nginx-0.0.1-2003-11-18-11:04:34 import
Igor Sysoev <igor@sysoev.ru>
parents:
164
diff
changeset
|
208 |
3642 | 209 if (n == NGX_ERROR) { |
164
84036764e215
nginx-0.0.1-2003-10-29-11:30:44 import
Igor Sysoev <igor@sysoev.ru>
parents:
163
diff
changeset
|
210 c->read->error = 1; |
73
4534060fde92
nginx-0.0.1-2003-04-10-19:08:54 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
211 } |
4534060fde92
nginx-0.0.1-2003-04-10-19:08:54 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
212 |
4534060fde92
nginx-0.0.1-2003-04-10-19:08:54 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
213 return n; |
4534060fde92
nginx-0.0.1-2003-04-10-19:08:54 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
214 } |