Mercurial > hg > nginx
annotate src/event/ngx_event_udp.c @ 7285:88a624c9b491
Events: moved ngx_recvmsg() to new file src/event/ngx_event_udp.c.
author | Roman Arutyunyan <arut@nginx.com> |
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date | Fri, 01 Jun 2018 16:55:49 +0300 |
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children | d27aa9060c95 |
rev | line source |
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7285
88a624c9b491
Events: moved ngx_recvmsg() to new file src/event/ngx_event_udp.c.
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1 |
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2 /* |
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3 * Copyright (C) Roman Arutyunyan |
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4 * Copyright (C) Nginx, Inc. |
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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> |
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11 |
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12 |
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13 #if !(NGX_WIN32) |
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14 |
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15 static void ngx_close_accepted_udp_connection(ngx_connection_t *c); |
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16 |
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17 |
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18 void |
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19 ngx_event_recvmsg(ngx_event_t *ev) |
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20 { |
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21 ssize_t n; |
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22 ngx_log_t *log; |
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23 ngx_err_t err; |
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24 socklen_t socklen, local_socklen; |
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25 ngx_event_t *rev, *wev; |
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26 struct iovec iov[1]; |
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27 struct msghdr msg; |
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28 ngx_sockaddr_t sa, lsa; |
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29 struct sockaddr *sockaddr, *local_sockaddr; |
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30 ngx_listening_t *ls; |
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31 ngx_event_conf_t *ecf; |
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32 ngx_connection_t *c, *lc; |
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33 static u_char buffer[65535]; |
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34 |
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35 #if (NGX_HAVE_MSGHDR_MSG_CONTROL) |
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36 |
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37 #if (NGX_HAVE_IP_RECVDSTADDR) |
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38 u_char msg_control[CMSG_SPACE(sizeof(struct in_addr))]; |
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39 #elif (NGX_HAVE_IP_PKTINFO) |
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40 u_char msg_control[CMSG_SPACE(sizeof(struct in_pktinfo))]; |
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41 #endif |
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42 |
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43 #if (NGX_HAVE_INET6 && NGX_HAVE_IPV6_RECVPKTINFO) |
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44 u_char msg_control6[CMSG_SPACE(sizeof(struct in6_pktinfo))]; |
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45 #endif |
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46 |
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47 #endif |
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48 |
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49 if (ev->timedout) { |
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50 if (ngx_enable_accept_events((ngx_cycle_t *) ngx_cycle) != NGX_OK) { |
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51 return; |
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52 } |
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53 |
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54 ev->timedout = 0; |
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55 } |
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56 |
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57 ecf = ngx_event_get_conf(ngx_cycle->conf_ctx, ngx_event_core_module); |
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58 |
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59 if (!(ngx_event_flags & NGX_USE_KQUEUE_EVENT)) { |
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60 ev->available = ecf->multi_accept; |
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61 } |
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62 |
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63 lc = ev->data; |
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64 ls = lc->listening; |
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65 ev->ready = 0; |
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66 |
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67 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, ev->log, 0, |
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68 "recvmsg on %V, ready: %d", &ls->addr_text, ev->available); |
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69 |
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70 do { |
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71 ngx_memzero(&msg, sizeof(struct msghdr)); |
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72 |
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73 iov[0].iov_base = (void *) buffer; |
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74 iov[0].iov_len = sizeof(buffer); |
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75 |
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76 msg.msg_name = &sa; |
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77 msg.msg_namelen = sizeof(ngx_sockaddr_t); |
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78 msg.msg_iov = iov; |
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79 msg.msg_iovlen = 1; |
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80 |
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81 #if (NGX_HAVE_MSGHDR_MSG_CONTROL) |
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82 |
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83 if (ls->wildcard) { |
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84 |
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85 #if (NGX_HAVE_IP_RECVDSTADDR || NGX_HAVE_IP_PKTINFO) |
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86 if (ls->sockaddr->sa_family == AF_INET) { |
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87 msg.msg_control = &msg_control; |
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88 msg.msg_controllen = sizeof(msg_control); |
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89 } |
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90 #endif |
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91 |
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92 #if (NGX_HAVE_INET6 && NGX_HAVE_IPV6_RECVPKTINFO) |
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93 if (ls->sockaddr->sa_family == AF_INET6) { |
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94 msg.msg_control = &msg_control6; |
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95 msg.msg_controllen = sizeof(msg_control6); |
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96 } |
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97 #endif |
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98 } |
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99 |
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100 #endif |
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101 |
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102 n = recvmsg(lc->fd, &msg, 0); |
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103 |
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104 if (n == -1) { |
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105 err = ngx_socket_errno; |
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106 |
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107 if (err == NGX_EAGAIN) { |
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108 ngx_log_debug0(NGX_LOG_DEBUG_EVENT, ev->log, err, |
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109 "recvmsg() not ready"); |
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110 return; |
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111 } |
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112 |
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113 ngx_log_error(NGX_LOG_ALERT, ev->log, err, "recvmsg() failed"); |
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114 |
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115 return; |
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116 } |
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117 |
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118 #if (NGX_HAVE_MSGHDR_MSG_CONTROL) |
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119 if (msg.msg_flags & (MSG_TRUNC|MSG_CTRUNC)) { |
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120 ngx_log_error(NGX_LOG_ALERT, ev->log, 0, |
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121 "recvmsg() truncated data"); |
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122 continue; |
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123 } |
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124 #endif |
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125 |
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126 sockaddr = msg.msg_name; |
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127 socklen = msg.msg_namelen; |
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128 |
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129 if (socklen > (socklen_t) sizeof(ngx_sockaddr_t)) { |
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130 socklen = sizeof(ngx_sockaddr_t); |
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131 } |
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132 |
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133 if (socklen == 0) { |
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134 |
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135 /* |
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136 * on Linux recvmsg() returns zero msg_namelen |
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137 * when receiving packets from unbound AF_UNIX sockets |
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138 */ |
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139 |
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140 socklen = sizeof(struct sockaddr); |
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141 ngx_memzero(&sa, sizeof(struct sockaddr)); |
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142 sa.sockaddr.sa_family = ls->sockaddr->sa_family; |
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143 } |
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144 |
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145 local_sockaddr = ls->sockaddr; |
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146 local_socklen = ls->socklen; |
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147 |
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148 #if (NGX_HAVE_MSGHDR_MSG_CONTROL) |
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149 |
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150 if (ls->wildcard) { |
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151 struct cmsghdr *cmsg; |
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152 |
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153 ngx_memcpy(&lsa, local_sockaddr, local_socklen); |
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154 local_sockaddr = &lsa.sockaddr; |
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155 |
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156 for (cmsg = CMSG_FIRSTHDR(&msg); |
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157 cmsg != NULL; |
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158 cmsg = CMSG_NXTHDR(&msg, cmsg)) |
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159 { |
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160 |
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161 #if (NGX_HAVE_IP_RECVDSTADDR) |
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162 |
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163 if (cmsg->cmsg_level == IPPROTO_IP |
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164 && cmsg->cmsg_type == IP_RECVDSTADDR |
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165 && local_sockaddr->sa_family == AF_INET) |
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166 { |
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167 struct in_addr *addr; |
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168 struct sockaddr_in *sin; |
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169 |
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170 addr = (struct in_addr *) CMSG_DATA(cmsg); |
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171 sin = (struct sockaddr_in *) local_sockaddr; |
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172 sin->sin_addr = *addr; |
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173 |
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174 break; |
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175 } |
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176 |
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177 #elif (NGX_HAVE_IP_PKTINFO) |
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178 |
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179 if (cmsg->cmsg_level == IPPROTO_IP |
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180 && cmsg->cmsg_type == IP_PKTINFO |
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181 && local_sockaddr->sa_family == AF_INET) |
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182 { |
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183 struct in_pktinfo *pkt; |
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184 struct sockaddr_in *sin; |
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185 |
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186 pkt = (struct in_pktinfo *) CMSG_DATA(cmsg); |
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187 sin = (struct sockaddr_in *) local_sockaddr; |
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188 sin->sin_addr = pkt->ipi_addr; |
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189 |
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190 break; |
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191 } |
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192 |
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193 #endif |
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194 |
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195 #if (NGX_HAVE_INET6 && NGX_HAVE_IPV6_RECVPKTINFO) |
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196 |
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197 if (cmsg->cmsg_level == IPPROTO_IPV6 |
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198 && cmsg->cmsg_type == IPV6_PKTINFO |
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199 && local_sockaddr->sa_family == AF_INET6) |
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200 { |
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201 struct in6_pktinfo *pkt6; |
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202 struct sockaddr_in6 *sin6; |
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203 |
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204 pkt6 = (struct in6_pktinfo *) CMSG_DATA(cmsg); |
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205 sin6 = (struct sockaddr_in6 *) local_sockaddr; |
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206 sin6->sin6_addr = pkt6->ipi6_addr; |
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207 |
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208 break; |
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209 } |
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210 |
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211 #endif |
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212 |
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213 } |
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214 } |
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215 |
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216 #endif |
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217 |
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218 #if (NGX_STAT_STUB) |
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219 (void) ngx_atomic_fetch_add(ngx_stat_accepted, 1); |
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220 #endif |
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221 |
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222 ngx_accept_disabled = ngx_cycle->connection_n / 8 |
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223 - ngx_cycle->free_connection_n; |
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224 |
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225 c = ngx_get_connection(lc->fd, ev->log); |
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226 if (c == NULL) { |
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227 return; |
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228 } |
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229 |
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230 c->shared = 1; |
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231 c->type = SOCK_DGRAM; |
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232 c->socklen = socklen; |
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233 |
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234 #if (NGX_STAT_STUB) |
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235 (void) ngx_atomic_fetch_add(ngx_stat_active, 1); |
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236 #endif |
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237 |
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238 c->pool = ngx_create_pool(ls->pool_size, ev->log); |
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239 if (c->pool == NULL) { |
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240 ngx_close_accepted_udp_connection(c); |
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241 return; |
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242 } |
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243 |
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244 c->sockaddr = ngx_palloc(c->pool, socklen); |
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245 if (c->sockaddr == NULL) { |
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246 ngx_close_accepted_udp_connection(c); |
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247 return; |
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248 } |
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249 |
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250 ngx_memcpy(c->sockaddr, sockaddr, socklen); |
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251 |
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252 log = ngx_palloc(c->pool, sizeof(ngx_log_t)); |
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253 if (log == NULL) { |
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254 ngx_close_accepted_udp_connection(c); |
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255 return; |
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256 } |
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257 |
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258 *log = ls->log; |
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259 |
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260 c->send = ngx_udp_send; |
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261 c->send_chain = ngx_udp_send_chain; |
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262 |
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263 c->log = log; |
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264 c->pool->log = log; |
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265 c->listening = ls; |
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266 |
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267 if (local_sockaddr == &lsa.sockaddr) { |
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268 local_sockaddr = ngx_palloc(c->pool, local_socklen); |
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269 if (local_sockaddr == NULL) { |
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270 ngx_close_accepted_udp_connection(c); |
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271 return; |
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272 } |
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273 |
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274 ngx_memcpy(local_sockaddr, &lsa, local_socklen); |
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275 } |
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276 |
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277 c->local_sockaddr = local_sockaddr; |
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278 c->local_socklen = local_socklen; |
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279 |
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280 c->buffer = ngx_create_temp_buf(c->pool, n); |
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281 if (c->buffer == NULL) { |
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282 ngx_close_accepted_udp_connection(c); |
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283 return; |
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284 } |
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285 |
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286 c->buffer->last = ngx_cpymem(c->buffer->last, buffer, n); |
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287 |
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288 rev = c->read; |
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289 wev = c->write; |
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290 |
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291 wev->ready = 1; |
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292 |
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293 rev->log = log; |
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294 wev->log = log; |
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295 |
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296 /* |
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297 * TODO: MT: - ngx_atomic_fetch_add() |
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298 * or protection by critical section or light mutex |
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299 * |
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300 * TODO: MP: - allocated in a shared memory |
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301 * - ngx_atomic_fetch_add() |
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302 * or protection by critical section or light mutex |
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303 */ |
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304 |
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305 c->number = ngx_atomic_fetch_add(ngx_connection_counter, 1); |
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306 |
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307 #if (NGX_STAT_STUB) |
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308 (void) ngx_atomic_fetch_add(ngx_stat_handled, 1); |
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309 #endif |
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310 |
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311 if (ls->addr_ntop) { |
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312 c->addr_text.data = ngx_pnalloc(c->pool, ls->addr_text_max_len); |
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313 if (c->addr_text.data == NULL) { |
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314 ngx_close_accepted_udp_connection(c); |
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315 return; |
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316 } |
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317 |
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318 c->addr_text.len = ngx_sock_ntop(c->sockaddr, c->socklen, |
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319 c->addr_text.data, |
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320 ls->addr_text_max_len, 0); |
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321 if (c->addr_text.len == 0) { |
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322 ngx_close_accepted_udp_connection(c); |
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323 return; |
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324 } |
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325 } |
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326 |
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327 #if (NGX_DEBUG) |
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328 { |
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329 ngx_str_t addr; |
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330 u_char text[NGX_SOCKADDR_STRLEN]; |
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331 |
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332 ngx_debug_accepted_connection(ecf, c); |
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333 |
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334 if (log->log_level & NGX_LOG_DEBUG_EVENT) { |
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335 addr.data = text; |
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336 addr.len = ngx_sock_ntop(c->sockaddr, c->socklen, text, |
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337 NGX_SOCKADDR_STRLEN, 1); |
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338 |
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339 ngx_log_debug4(NGX_LOG_DEBUG_EVENT, log, 0, |
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340 "*%uA recvmsg: %V fd:%d n:%z", |
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341 c->number, &addr, c->fd, n); |
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342 } |
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343 |
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344 } |
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345 #endif |
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346 |
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347 log->data = NULL; |
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348 log->handler = NULL; |
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349 |
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350 ls->handler(c); |
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351 |
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352 if (ngx_event_flags & NGX_USE_KQUEUE_EVENT) { |
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353 ev->available -= n; |
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354 } |
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355 |
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356 } while (ev->available); |
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357 } |
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358 |
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359 |
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360 static void |
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361 ngx_close_accepted_udp_connection(ngx_connection_t *c) |
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362 { |
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363 ngx_free_connection(c); |
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364 |
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365 c->fd = (ngx_socket_t) -1; |
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366 |
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367 if (c->pool) { |
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368 ngx_destroy_pool(c->pool); |
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369 } |
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370 |
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371 #if (NGX_STAT_STUB) |
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372 (void) ngx_atomic_fetch_add(ngx_stat_active, -1); |
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373 #endif |
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374 } |
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375 |
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376 #endif |