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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122
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16 static ngx_int_t ngx_enable_accept_events(ngx_cycle_t *cycle);
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17 static ngx_int_t ngx_disable_accept_events(ngx_cycle_t *cycle);
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92
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18 static void ngx_close_accepted_connection(ngx_connection_t *c);
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0
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19
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20
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42
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21 void
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22 ngx_event_accept(ngx_event_t *ev)
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0
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23 {
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92
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24 socklen_t sl;
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32
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25 ngx_err_t err;
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26 ngx_log_t *log;
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27 ngx_socket_t s;
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28 ngx_event_t *rev, *wev;
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92
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29 ngx_listening_t *ls;
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30 ngx_connection_t *c, *lc;
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32
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31 ngx_event_conf_t *ecf;
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92
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32 char sa[NGX_SOCKLEN];
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0
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33
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34 ecf = ngx_event_get_conf(ngx_cycle->conf_ctx, ngx_event_core_module);
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35
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36 if (ngx_event_flags & NGX_USE_RTSIG_EVENT) {
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37 ev->available = 1;
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38
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4
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39 } else if (!(ngx_event_flags & NGX_USE_KQUEUE_EVENT)) {
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0
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40 ev->available = ecf->multi_accept;
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41 }
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42
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92
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43 lc = ev->data;
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44 ls = lc->listening;
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45 ev->ready = 0;
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0
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46
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47 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, ev->log, 0,
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92
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48 "accept on %V, ready: %d", &ls->addr_text, ev->available);
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0
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49
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50 do {
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92
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51 sl = NGX_SOCKLEN;
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0
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52
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92
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53 s = accept(lc->fd, (struct sockaddr *) sa, &sl);
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26
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54
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0
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55 if (s == -1) {
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56 err = ngx_socket_errno;
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57
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58 if (err == NGX_EAGAIN) {
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59 return;
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60 }
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61
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58
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62 ngx_log_error((err == NGX_ECONNABORTED) ? NGX_LOG_CRIT:
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63 NGX_LOG_ALERT,
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92
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64 ev->log, err, "accept() failed");
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0
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65
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66 if (err == NGX_ECONNABORTED) {
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4
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67 if (ngx_event_flags & NGX_USE_KQUEUE_EVENT) {
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0
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68 ev->available--;
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69 }
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70
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71 if (ev->available) {
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72 continue;
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73 }
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74 }
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75
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76 return;
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77 }
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78
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79 #if (NGX_STAT_STUB)
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110
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80 ngx_atomic_fetch_add(ngx_stat_accepted, 1);
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81 ngx_atomic_fetch_add(ngx_stat_active, 1);
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0
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82 #endif
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83
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92
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84 ngx_accept_disabled = NGX_ACCEPT_THRESHOLD
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85 - ngx_cycle->free_connection_n;
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86
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87 c = ngx_get_connection(s, ev->log);
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0
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88
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92
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89 if (c == NULL) {
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90 if (ngx_close_socket(s) == -1) {
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91 ngx_log_error(NGX_LOG_ALERT, ev->log, ngx_socket_errno,
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92 ngx_close_socket_n " failed");
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93 }
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0
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94
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92
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95 return;
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96 }
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97
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98 c->pool = ngx_create_pool(ls->pool_size, ev->log);
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99 if (c->pool == NULL) {
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100 ngx_close_accepted_connection(c);
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101 return;
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102 }
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0
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103
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92
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104 c->sockaddr = ngx_palloc(c->pool, sl);
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105 if (c->sockaddr == NULL) {
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106 ngx_close_accepted_connection(c);
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107 return;
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108 }
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109
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110 ngx_memcpy(c->sockaddr, sa, sl);
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111
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112 log = ngx_palloc(c->pool, sizeof(ngx_log_t));
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113 if (log == NULL) {
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114 ngx_close_accepted_connection(c);
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0
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115 return;
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116 }
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117
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36
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118 /* set a blocking mode for aio and non-blocking mode for others */
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0
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119
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120 if (ngx_inherited_nonblocking) {
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92
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121 if (ngx_event_flags & NGX_USE_AIO_EVENT) {
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0
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122 if (ngx_blocking(s) == -1) {
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92
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123 ngx_log_error(NGX_LOG_ALERT, ev->log, ngx_socket_errno,
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0
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124 ngx_blocking_n " failed");
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92
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125 ngx_close_accepted_connection(c);
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0
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126 return;
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127 }
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128 }
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129
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130 } else {
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131 if (!(ngx_event_flags & (NGX_USE_AIO_EVENT|NGX_USE_RTSIG_EVENT))) {
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132 if (ngx_nonblocking(s) == -1) {
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92
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133 ngx_log_error(NGX_LOG_ALERT, ev->log, ngx_socket_errno,
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0
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134 ngx_nonblocking_n " failed");
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92
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135 ngx_close_accepted_connection(c);
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0
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136 return;
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137 }
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138 }
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139 }
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140
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92
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141 *log = ls->log;
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142
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143 c->recv = ngx_recv;
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144 c->send = ngx_send;
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145 c->send_chain = ngx_send_chain;
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0
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146
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92
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147 c->log = log;
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148 c->pool->log = log;
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0
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149
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92
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150 c->listening = ls;
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151 c->socklen = sl;
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152
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153 c->unexpected_eof = 1;
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154
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155 c->ctx = lc->ctx;
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156 c->servers = lc->servers;
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0
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157
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110
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158 rev = c->read;
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159 wev = c->write;
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0
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160
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161 wev->ready = 1;
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162
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163 if (ngx_event_flags & (NGX_USE_AIO_EVENT|NGX_USE_RTSIG_EVENT)) {
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42
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164 /* rtsig, aio, iocp */
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0
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165 rev->ready = 1;
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166 }
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167
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168 if (ev->deferred_accept) {
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169 rev->ready = 1;
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72
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170 #if (NGX_HAVE_KQUEUE)
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171 rev->available = 1;
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172 #endif
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0
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173 }
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174
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175 rev->log = log;
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176 wev->log = log;
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177
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178 /*
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110
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179 * TODO: MT: - ngx_atomic_fetch_add()
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0
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180 * or protection by critical section or light mutex
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181 *
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182 * TODO: MP: - allocated in a shared memory
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110
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183 * - ngx_atomic_fetch_add()
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0
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184 * or protection by critical section or light mutex
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185 */
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186
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110
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187 c->number = ngx_atomic_fetch_add(ngx_connection_counter, 1);
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0
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188
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44
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189 #if (NGX_STAT_STUB)
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110
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190 ngx_atomic_fetch_add(ngx_stat_handled, 1);
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44
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191 #endif
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192
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0
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193 #if (NGX_THREADS)
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194 rev->lock = &c->lock;
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195 wev->lock = &c->lock;
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196 rev->own_lock = &c->lock;
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197 wev->own_lock = &c->lock;
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198 #endif
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199
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92
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200 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, log, 0,
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0
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201 "accept: fd:%d c:%d", s, c->number);
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202
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92
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203 if (ls->addr_ntop) {
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204 c->addr_text.data = ngx_palloc(c->pool, ls->addr_text_max_len);
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0
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205 if (c->addr_text.data == NULL) {
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92
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206 ngx_close_accepted_connection(c);
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0
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207 return;
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208 }
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209
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92
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210 c->addr_text.len = ngx_sock_ntop(ls->family, c->sockaddr,
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0
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211 c->addr_text.data,
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92
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212 ls->addr_text_max_len);
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0
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213 if (c->addr_text.len == 0) {
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92
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214 ngx_close_accepted_connection(c);
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0
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215 return;
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216 }
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217 }
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218
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219 #if (NGX_DEBUG)
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220 {
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221
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222 uint32_t *addr;
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223 in_addr_t i;
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28
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224 struct sockaddr_in *sin;
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0
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225
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28
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226 sin = (struct sockaddr_in *) sa;
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0
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227 addr = ecf->debug_connection.elts;
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228 for (i = 0; i < ecf->debug_connection.nelts; i++) {
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28
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229 if (addr[i] == sin->sin_addr.s_addr) {
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0
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230 log->log_level = NGX_LOG_DEBUG_CONNECTION|NGX_LOG_DEBUG_ALL;
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231 break;
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232 }
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233 }
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234
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235 }
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236 #endif
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237
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238 if (ngx_add_conn && (ngx_event_flags & NGX_USE_EPOLL_EVENT) == 0) {
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239 if (ngx_add_conn(c) == NGX_ERROR) {
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92
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240 ngx_close_accepted_connection(c);
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0
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241 return;
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242 }
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243 }
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244
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245 log->data = NULL;
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246 log->handler = NULL;
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247
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92
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248 ls->handler(c);
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0
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249
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4
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250 if (ngx_event_flags & NGX_USE_KQUEUE_EVENT) {
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0
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251 ev->available--;
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252 }
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253
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254 } while (ev->available);
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255 }
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256
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257
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42
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258 ngx_int_t
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259 ngx_trylock_accept_mutex(ngx_cycle_t *cycle)
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0
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260 {
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261 if (*ngx_accept_mutex == 0
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262 && ngx_atomic_cmp_set(ngx_accept_mutex, 0, ngx_pid))
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263 {
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264 ngx_log_debug0(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
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265 "accept mutex locked");
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266
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122
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267 if (ngx_accept_mutex_held
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268 && (!(ngx_event_flags & NGX_USE_RTSIG_EVENT)
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269 || *ngx_accept_mutex_last_owner == (ngx_atomic_t) ngx_pid))
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270 {
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271 return NGX_OK;
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272 }
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0
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273
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122
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274 if (ngx_enable_accept_events(cycle) == NGX_ERROR) {
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275 *ngx_accept_mutex = 0;
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276 return NGX_ERROR;
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0
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277 }
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278
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122
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279 ngx_accept_mutex_held = 1;
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280
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0
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281 return NGX_OK;
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282 }
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283
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284 if (ngx_accept_mutex_held) {
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285 if (ngx_disable_accept_events(cycle) == NGX_ERROR) {
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286 return NGX_ERROR;
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287 }
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288
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289 ngx_accept_mutex_held = 0;
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290 }
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291
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292 return NGX_OK;
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293 }
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294
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295
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122
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296 static ngx_int_t
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42
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297 ngx_enable_accept_events(ngx_cycle_t *cycle)
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0
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298 {
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92
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299 ngx_uint_t i;
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300 ngx_listening_t *ls;
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301 ngx_connection_t *c;
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0
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302
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92
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303 ls = cycle->listening.elts;
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0
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304 for (i = 0; i < cycle->listening.nelts; i++) {
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305
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92
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306 c = ls[i].connection;
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0
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307
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308 if (ngx_event_flags & NGX_USE_RTSIG_EVENT) {
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122
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309
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310 if (ngx_accept_mutex_held) {
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311 c->read->disabled = 1;
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312 }
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313
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92
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314 if (ngx_add_conn(c) == NGX_ERROR) {
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0
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315 return NGX_ERROR;
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316 }
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317
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122
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318 *ngx_accept_mutex_last_owner = ngx_pid;
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319
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0
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320 } else {
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92
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321 if (ngx_add_event(c->read, NGX_READ_EVENT, 0) == NGX_ERROR) {
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0
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322 return NGX_ERROR;
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323 }
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324 }
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325 }
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326
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327 return NGX_OK;
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328 }
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329
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330
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122
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331 static ngx_int_t
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42
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332 ngx_disable_accept_events(ngx_cycle_t *cycle)
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0
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333 {
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92
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334 ngx_uint_t i;
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335 ngx_listening_t *ls;
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336 ngx_connection_t *c;
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0
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337
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92
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338 ls = cycle->listening.elts;
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0
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339 for (i = 0; i < cycle->listening.nelts; i++) {
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340
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92
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341 c = ls[i].connection;
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342
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343 if (!c->read->active) {
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344 continue;
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345 }
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0
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346
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347 if (ngx_event_flags & NGX_USE_RTSIG_EVENT) {
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92
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348 if (ngx_del_conn(c, NGX_DISABLE_EVENT) == NGX_ERROR) {
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0
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349 return NGX_ERROR;
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350 }
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351
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352 } else {
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92
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353 if (ngx_del_event(c->read, NGX_READ_EVENT, NGX_DISABLE_EVENT)
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354 == NGX_ERROR)
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0
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355 {
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356 return NGX_ERROR;
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357 }
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358 }
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359 }
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360
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361 return NGX_OK;
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362 }
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363
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364
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42
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365 static void
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92
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366 ngx_close_accepted_connection(ngx_connection_t *c)
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0
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367 {
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92
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368 ngx_socket_t fd;
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369
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370 ngx_free_connection(c);
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371
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372 fd = c->fd;
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373 c->fd = (ngx_socket_t) -1;
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374
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375 if (ngx_close_socket(fd) == -1) {
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376 ngx_log_error(NGX_LOG_ALERT, c->log, ngx_socket_errno,
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0
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377 ngx_close_socket_n " failed");
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378 }
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44
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379
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92
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380 if (c->pool) {
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381 ngx_destroy_pool(c->pool);
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382 }
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383
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44
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384 #if (NGX_STAT_STUB)
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110
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385 ngx_atomic_fetch_add(ngx_stat_active, -1);
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44
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386 #endif
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0
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387 }
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388
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389
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92
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390 u_char *
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42
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391 ngx_accept_log_error(ngx_log_t *log, u_char *buf, size_t len)
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0
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392 {
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92
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393 return ngx_snprintf(buf, len, " while accepting new connection on %V",
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394 log->data);
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0
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395 }
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