Mercurial > hg > nginx-quic
annotate src/os/unix/ngx_readv_chain.c @ 8551:c35b255d80dc quic
HTTP/3: close connection on keepalive_requests * 2.
After receiving GOAWAY, client is not supposed to create new streams. However,
until client reads this frame, we allow it to create new streams, which are
gracefully rejected. To prevent client from abusing this algorithm, a new
limit is introduced. Upon reaching keepalive_requests * 2, server now closes
the entire QUIC connection claiming excessive load.
author | Roman Arutyunyan <arut@nginx.com> |
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date | Thu, 29 Jul 2021 16:01:37 +0300 |
parents | 7f5e3595caff |
children | 5119c8150478 |
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; |
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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; | |
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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 == 0 && !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 == vec.nalloc) { |
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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); |
75
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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) { |
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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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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 |
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152 * bytes may be received between kevent() and readv() |
188
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153 */ |
163
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diff
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154 |
188
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155 if (rev->available <= 0) { |
375
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156 if (!rev->pending_eof) { |
188
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157 rev->ready = 0; |
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158 } |
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159 |
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160 rev->available = 0; |
188
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161 } |
73
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162 |
188
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163 return n; |
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164 } |
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165 |
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166 #endif |
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167 |
7583
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168 #if (NGX_HAVE_FIONREAD) |
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169 |
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170 if (rev->available >= 0) { |
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171 rev->available -= n; |
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172 |
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173 /* |
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174 * negative rev->available means some additional bytes |
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175 * were received between kernel notification and readv(), |
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176 * and therefore ev->ready can be safely reset even for |
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177 * edge-triggered event methods |
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178 */ |
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179 |
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180 if (rev->available < 0) { |
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181 rev->available = 0; |
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182 rev->ready = 0; |
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183 } |
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184 |
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185 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, 0, |
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186 "readv: avail:%d", rev->available); |
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187 |
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188 } else if (n == size) { |
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189 |
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190 if (ngx_socket_nread(c->fd, &rev->available) == -1) { |
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|
191 n = ngx_connection_error(c, ngx_socket_errno, |
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|
192 ngx_socket_nread_n " failed"); |
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193 break; |
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194 } |
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195 |
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196 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, 0, |
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197 "readv: avail:%d", rev->available); |
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198 } |
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199 |
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200 #endif |
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201 |
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Improved EPOLLRDHUP handling.
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|
202 #if (NGX_HAVE_EPOLLRDHUP) |
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203 |
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204 if ((ngx_event_flags & NGX_USE_EPOLL_EVENT) |
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205 && ngx_use_epoll_rdhup) |
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|
206 { |
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|
207 if (n < size) { |
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208 if (!rev->pending_eof) { |
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209 rev->ready = 0; |
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210 } |
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211 |
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212 rev->available = 0; |
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213 } |
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214 |
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|
215 return n; |
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|
216 } |
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217 |
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|
218 #endif |
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|
219 |
5267
13c006f0c40e
Events: honor NGX_USE_GREEDY_EVENT when kqueue support is enabled.
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parents:
4597
diff
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|
220 if (n < size && !(ngx_event_flags & NGX_USE_GREEDY_EVENT)) { |
188
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221 rev->ready = 0; |
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222 } |
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223 |
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224 return n; |
73
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|
225 } |
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|
226 |
257
70e1c7d2b83d
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188
diff
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|
227 err = ngx_socket_errno; |
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diff
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|
228 |
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diff
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|
229 if (err == NGX_EAGAIN || err == NGX_EINTR) { |
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diff
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|
230 ngx_log_debug0(NGX_LOG_DEBUG_EVENT, c->log, err, |
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188
diff
changeset
|
231 "readv() not ready"); |
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188
diff
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|
232 n = NGX_AGAIN; |
188
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|
233 |
257
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diff
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|
234 } else { |
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diff
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|
235 n = ngx_connection_error(c, err, "readv() failed"); |
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188
diff
changeset
|
236 break; |
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diff
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|
237 } |
188
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|
238 |
257
70e1c7d2b83d
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188
diff
changeset
|
239 } while (err == NGX_EINTR); |
188
0061d1f0908d
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|
240 |
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|
241 rev->ready = 0; |
0061d1f0908d
nginx-0.0.1-2003-11-18-11:04:34 import
Igor Sysoev <igor@sysoev.ru>
parents:
164
diff
changeset
|
242 |
3642 | 243 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
|
244 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
|
245 } |
4534060fde92
nginx-0.0.1-2003-04-10-19:08:54 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
246 |
4534060fde92
nginx-0.0.1-2003-04-10-19:08:54 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
247 return n; |
4534060fde92
nginx-0.0.1-2003-04-10-19:08:54 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
|
248 } |