0
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1
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2 /*
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3 * Copyright (C) Igor Sysoev
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4 */
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5
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6
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7 #include <ngx_config.h>
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8 #include <ngx_core.h>
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9 #include <ngx_event.h>
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10
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11
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92
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12 /* the buffer size is enough to hold "struct sockaddr_un" */
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13 #define NGX_SOCKLEN 512
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14
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15
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16 static void ngx_close_accepted_connection(ngx_connection_t *c);
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0
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17
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18
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42
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19 void
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20 ngx_event_accept(ngx_event_t *ev)
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0
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21 {
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92
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22 socklen_t sl;
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32
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23 ngx_err_t err;
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24 ngx_log_t *log;
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25 ngx_socket_t s;
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26 ngx_event_t *rev, *wev;
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92
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27 ngx_listening_t *ls;
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28 ngx_connection_t *c, *lc;
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32
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29 ngx_event_conf_t *ecf;
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92
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30 char sa[NGX_SOCKLEN];
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0
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31
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32 ecf = ngx_event_get_conf(ngx_cycle->conf_ctx, ngx_event_core_module);
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33
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34 if (ngx_event_flags & NGX_USE_RTSIG_EVENT) {
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35 ev->available = 1;
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36
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4
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37 } else if (!(ngx_event_flags & NGX_USE_KQUEUE_EVENT)) {
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0
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38 ev->available = ecf->multi_accept;
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39 }
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40
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92
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41 lc = ev->data;
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42 ls = lc->listening;
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43 ev->ready = 0;
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0
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44
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45 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, ev->log, 0,
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92
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46 "accept on %V, ready: %d", &ls->addr_text, ev->available);
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0
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47
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48 do {
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92
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49 sl = NGX_SOCKLEN;
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0
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50
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92
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51 s = accept(lc->fd, (struct sockaddr *) sa, &sl);
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26
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52
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0
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53 if (s == -1) {
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54 err = ngx_socket_errno;
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55
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56 if (err == NGX_EAGAIN) {
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57 return;
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58 }
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59
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58
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60 ngx_log_error((err == NGX_ECONNABORTED) ? NGX_LOG_CRIT:
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61 NGX_LOG_ALERT,
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92
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62 ev->log, err, "accept() failed");
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0
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63
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64 if (err == NGX_ECONNABORTED) {
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4
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65 if (ngx_event_flags & NGX_USE_KQUEUE_EVENT) {
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0
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66 ev->available--;
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67 }
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68
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69 if (ev->available) {
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70 continue;
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71 }
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72 }
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73
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74 return;
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75 }
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76
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77 #if (NGX_STAT_STUB)
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110
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78 ngx_atomic_fetch_add(ngx_stat_accepted, 1);
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79 ngx_atomic_fetch_add(ngx_stat_active, 1);
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0
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80 #endif
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81
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92
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82 ngx_accept_disabled = NGX_ACCEPT_THRESHOLD
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83 - ngx_cycle->free_connection_n;
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84
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85 c = ngx_get_connection(s, ev->log);
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0
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86
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92
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87 if (c == NULL) {
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88 if (ngx_close_socket(s) == -1) {
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89 ngx_log_error(NGX_LOG_ALERT, ev->log, ngx_socket_errno,
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90 ngx_close_socket_n " failed");
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91 }
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0
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92
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92
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93 return;
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94 }
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95
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96 c->pool = ngx_create_pool(ls->pool_size, ev->log);
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97 if (c->pool == NULL) {
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98 ngx_close_accepted_connection(c);
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99 return;
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100 }
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0
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101
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92
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102 c->sockaddr = ngx_palloc(c->pool, sl);
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103 if (c->sockaddr == NULL) {
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104 ngx_close_accepted_connection(c);
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105 return;
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106 }
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107
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108 ngx_memcpy(c->sockaddr, sa, sl);
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109
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110 log = ngx_palloc(c->pool, sizeof(ngx_log_t));
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111 if (log == NULL) {
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112 ngx_close_accepted_connection(c);
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0
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113 return;
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114 }
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115
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36
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116 /* set a blocking mode for aio and non-blocking mode for others */
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0
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117
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118 if (ngx_inherited_nonblocking) {
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92
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119 if (ngx_event_flags & NGX_USE_AIO_EVENT) {
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0
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120 if (ngx_blocking(s) == -1) {
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92
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121 ngx_log_error(NGX_LOG_ALERT, ev->log, ngx_socket_errno,
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0
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122 ngx_blocking_n " failed");
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92
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123 ngx_close_accepted_connection(c);
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0
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124 return;
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125 }
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126 }
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127
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128 } else {
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129 if (!(ngx_event_flags & (NGX_USE_AIO_EVENT|NGX_USE_RTSIG_EVENT))) {
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130 if (ngx_nonblocking(s) == -1) {
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92
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131 ngx_log_error(NGX_LOG_ALERT, ev->log, ngx_socket_errno,
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0
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132 ngx_nonblocking_n " failed");
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92
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133 ngx_close_accepted_connection(c);
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0
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134 return;
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135 }
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136 }
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137 }
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138
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92
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139 *log = ls->log;
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140
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141 c->recv = ngx_recv;
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142 c->send = ngx_send;
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143 c->send_chain = ngx_send_chain;
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0
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144
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92
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145 c->log = log;
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146 c->pool->log = log;
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0
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147
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92
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148 c->listening = ls;
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149 c->socklen = sl;
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150
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151 c->unexpected_eof = 1;
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152
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153 c->ctx = lc->ctx;
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154 c->servers = lc->servers;
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0
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155
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110
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156 rev = c->read;
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157 wev = c->write;
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0
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158
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159 wev->ready = 1;
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160
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161 if (ngx_event_flags & (NGX_USE_AIO_EVENT|NGX_USE_RTSIG_EVENT)) {
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42
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162 /* rtsig, aio, iocp */
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0
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163 rev->ready = 1;
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164 }
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165
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166 if (ev->deferred_accept) {
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167 rev->ready = 1;
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72
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168 #if (NGX_HAVE_KQUEUE)
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169 rev->available = 1;
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170 #endif
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0
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171 }
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172
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173 rev->log = log;
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174 wev->log = log;
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175
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176 /*
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110
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177 * TODO: MT: - ngx_atomic_fetch_add()
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0
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178 * or protection by critical section or light mutex
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179 *
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180 * TODO: MP: - allocated in a shared memory
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110
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181 * - ngx_atomic_fetch_add()
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0
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182 * or protection by critical section or light mutex
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183 */
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184
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110
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185 c->number = ngx_atomic_fetch_add(ngx_connection_counter, 1);
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0
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186
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44
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187 #if (NGX_STAT_STUB)
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110
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188 ngx_atomic_fetch_add(ngx_stat_handled, 1);
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44
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189 #endif
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190
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0
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191 #if (NGX_THREADS)
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192 rev->lock = &c->lock;
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193 wev->lock = &c->lock;
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194 rev->own_lock = &c->lock;
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195 wev->own_lock = &c->lock;
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196 #endif
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197
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92
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198 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, log, 0,
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0
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199 "accept: fd:%d c:%d", s, c->number);
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200
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92
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201 if (ls->addr_ntop) {
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202 c->addr_text.data = ngx_palloc(c->pool, ls->addr_text_max_len);
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0
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203 if (c->addr_text.data == NULL) {
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92
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204 ngx_close_accepted_connection(c);
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0
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205 return;
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206 }
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207
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92
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208 c->addr_text.len = ngx_sock_ntop(ls->family, c->sockaddr,
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0
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209 c->addr_text.data,
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92
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210 ls->addr_text_max_len);
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0
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211 if (c->addr_text.len == 0) {
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92
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212 ngx_close_accepted_connection(c);
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0
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213 return;
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214 }
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215 }
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216
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217 #if (NGX_DEBUG)
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218 {
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219
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220 uint32_t *addr;
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221 in_addr_t i;
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28
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222 struct sockaddr_in *sin;
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0
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223
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28
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224 sin = (struct sockaddr_in *) sa;
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0
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225 addr = ecf->debug_connection.elts;
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226 for (i = 0; i < ecf->debug_connection.nelts; i++) {
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28
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227 if (addr[i] == sin->sin_addr.s_addr) {
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0
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228 log->log_level = NGX_LOG_DEBUG_CONNECTION|NGX_LOG_DEBUG_ALL;
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229 break;
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230 }
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231 }
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232
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233 }
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234 #endif
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235
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236 if (ngx_add_conn && (ngx_event_flags & NGX_USE_EPOLL_EVENT) == 0) {
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237 if (ngx_add_conn(c) == NGX_ERROR) {
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92
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238 ngx_close_accepted_connection(c);
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0
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239 return;
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240 }
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241 }
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242
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243 log->data = NULL;
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244 log->handler = NULL;
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245
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92
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246 ls->handler(c);
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0
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247
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4
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248 if (ngx_event_flags & NGX_USE_KQUEUE_EVENT) {
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0
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249 ev->available--;
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250 }
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251
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252 } while (ev->available);
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253 }
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254
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255
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42
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256 ngx_int_t
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257 ngx_trylock_accept_mutex(ngx_cycle_t *cycle)
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0
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258 {
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259 if (*ngx_accept_mutex == 0
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260 && ngx_atomic_cmp_set(ngx_accept_mutex, 0, ngx_pid))
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261 {
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262 ngx_log_debug0(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
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263 "accept mutex locked");
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264
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265 if (!ngx_accept_mutex_held) {
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266 if (ngx_enable_accept_events(cycle) == NGX_ERROR) {
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267 *ngx_accept_mutex = 0;
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268 return NGX_ERROR;
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269 }
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270
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271 ngx_accept_mutex_held = 1;
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272 }
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273
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274 return NGX_OK;
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275 }
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276
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277 if (ngx_accept_mutex_held) {
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278 if (ngx_disable_accept_events(cycle) == NGX_ERROR) {
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279 return NGX_ERROR;
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280 }
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281
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282 ngx_accept_mutex_held = 0;
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283 }
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284
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285 return NGX_OK;
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286 }
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287
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288
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42
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289 ngx_int_t
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290 ngx_enable_accept_events(ngx_cycle_t *cycle)
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0
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291 {
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92
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292 ngx_uint_t i;
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293 ngx_listening_t *ls;
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294 ngx_connection_t *c;
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0
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295
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92
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296 ls = cycle->listening.elts;
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0
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297 for (i = 0; i < cycle->listening.nelts; i++) {
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298
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92
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299 c = ls[i].connection;
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0
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300
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301 if (ngx_event_flags & NGX_USE_RTSIG_EVENT) {
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92
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302 if (ngx_add_conn(c) == NGX_ERROR) {
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0
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303 return NGX_ERROR;
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304 }
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305
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306 } else {
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92
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307 if (ngx_add_event(c->read, NGX_READ_EVENT, 0) == NGX_ERROR) {
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0
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308 return NGX_ERROR;
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309 }
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310 }
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311 }
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312
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313 return NGX_OK;
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314 }
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315
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316
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42
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317 ngx_int_t
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318 ngx_disable_accept_events(ngx_cycle_t *cycle)
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0
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319 {
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92
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320 ngx_uint_t i;
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321 ngx_listening_t *ls;
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322 ngx_connection_t *c;
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0
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323
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92
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324 ls = cycle->listening.elts;
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0
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325 for (i = 0; i < cycle->listening.nelts; i++) {
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326
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92
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327 c = ls[i].connection;
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328
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329 if (!c->read->active) {
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330 continue;
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331 }
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0
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332
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333 if (ngx_event_flags & NGX_USE_RTSIG_EVENT) {
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92
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334 if (ngx_del_conn(c, NGX_DISABLE_EVENT) == NGX_ERROR) {
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0
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335 return NGX_ERROR;
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336 }
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337
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338 } else {
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92
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339 if (ngx_del_event(c->read, NGX_READ_EVENT, NGX_DISABLE_EVENT)
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340 == NGX_ERROR)
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0
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341 {
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342 return NGX_ERROR;
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343 }
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344 }
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345 }
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346
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347 return NGX_OK;
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348 }
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349
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350
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42
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351 static void
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92
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352 ngx_close_accepted_connection(ngx_connection_t *c)
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0
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353 {
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92
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354 ngx_socket_t fd;
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355
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356 ngx_free_connection(c);
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357
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358 fd = c->fd;
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359 c->fd = (ngx_socket_t) -1;
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360
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361 if (ngx_close_socket(fd) == -1) {
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362 ngx_log_error(NGX_LOG_ALERT, c->log, ngx_socket_errno,
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0
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363 ngx_close_socket_n " failed");
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364 }
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44
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365
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92
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366 if (c->pool) {
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367 ngx_destroy_pool(c->pool);
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368 }
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369
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44
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370 #if (NGX_STAT_STUB)
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110
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371 ngx_atomic_fetch_add(ngx_stat_active, -1);
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44
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372 #endif
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0
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373 }
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374
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375
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92
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376 u_char *
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42
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377 ngx_accept_log_error(ngx_log_t *log, u_char *buf, size_t len)
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0
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378 {
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92
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379 return ngx_snprintf(buf, len, " while accepting new connection on %V",
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380 log->data);
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0
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381 }
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