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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236
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24 socklen_t socklen;
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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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236
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51 socklen = NGX_SOCKLEN;
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0
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52
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236
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53 s = accept(lc->fd, (struct sockaddr *) sa, &socklen);
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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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236
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59 ngx_log_debug0(NGX_LOG_DEBUG_EVENT, ev->log, err,
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60 "accept() not ready");
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0
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61 return;
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62 }
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63
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166
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64 ngx_log_error((err == NGX_ECONNABORTED) ? NGX_LOG_ERR:
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58
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65 NGX_LOG_ALERT,
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92
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66 ev->log, err, "accept() failed");
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0
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67
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68 if (err == NGX_ECONNABORTED) {
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4
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69 if (ngx_event_flags & NGX_USE_KQUEUE_EVENT) {
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0
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70 ev->available--;
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71 }
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72
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73 if (ev->available) {
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74 continue;
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75 }
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76 }
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77
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78 return;
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79 }
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80
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81 #if (NGX_STAT_STUB)
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110
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82 ngx_atomic_fetch_add(ngx_stat_accepted, 1);
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0
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83 #endif
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84
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412
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85 ngx_accept_disabled = ngx_cycle->connection_n / 8
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92
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86 - ngx_cycle->free_connection_n;
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87
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88 c = ngx_get_connection(s, ev->log);
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0
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89
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92
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90 if (c == NULL) {
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91 if (ngx_close_socket(s) == -1) {
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92 ngx_log_error(NGX_LOG_ALERT, ev->log, ngx_socket_errno,
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93 ngx_close_socket_n " failed");
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94 }
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0
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95
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92
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96 return;
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97 }
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98
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184
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99 #if (NGX_STAT_STUB)
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100 ngx_atomic_fetch_add(ngx_stat_active, 1);
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101 #endif
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102
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92
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103 c->pool = ngx_create_pool(ls->pool_size, ev->log);
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104 if (c->pool == NULL) {
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105 ngx_close_accepted_connection(c);
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106 return;
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107 }
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0
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108
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236
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109 c->sockaddr = ngx_palloc(c->pool, socklen);
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92
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110 if (c->sockaddr == NULL) {
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111 ngx_close_accepted_connection(c);
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112 return;
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113 }
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114
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236
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115 ngx_memcpy(c->sockaddr, sa, socklen);
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92
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116
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117 log = ngx_palloc(c->pool, sizeof(ngx_log_t));
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118 if (log == NULL) {
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119 ngx_close_accepted_connection(c);
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0
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120 return;
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121 }
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122
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36
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123 /* set a blocking mode for aio and non-blocking mode for others */
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0
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124
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125 if (ngx_inherited_nonblocking) {
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92
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126 if (ngx_event_flags & NGX_USE_AIO_EVENT) {
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0
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127 if (ngx_blocking(s) == -1) {
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92
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128 ngx_log_error(NGX_LOG_ALERT, ev->log, ngx_socket_errno,
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0
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129 ngx_blocking_n " failed");
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92
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130 ngx_close_accepted_connection(c);
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0
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131 return;
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132 }
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133 }
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134
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135 } else {
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136 if (!(ngx_event_flags & (NGX_USE_AIO_EVENT|NGX_USE_RTSIG_EVENT))) {
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137 if (ngx_nonblocking(s) == -1) {
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92
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138 ngx_log_error(NGX_LOG_ALERT, ev->log, ngx_socket_errno,
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0
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139 ngx_nonblocking_n " failed");
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92
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140 ngx_close_accepted_connection(c);
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0
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141 return;
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142 }
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143 }
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144 }
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145
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92
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146 *log = ls->log;
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147
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148 c->recv = ngx_recv;
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149 c->send = ngx_send;
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126
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150 c->recv_chain = ngx_recv_chain;
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92
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151 c->send_chain = ngx_send_chain;
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0
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152
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92
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153 c->log = log;
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154 c->pool->log = log;
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0
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155
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92
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156 c->listening = ls;
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236
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157 c->socklen = socklen;
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92
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158
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159 c->unexpected_eof = 1;
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160
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110
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161 rev = c->read;
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162 wev = c->write;
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0
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163
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164 wev->ready = 1;
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165
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166 if (ngx_event_flags & (NGX_USE_AIO_EVENT|NGX_USE_RTSIG_EVENT)) {
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42
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167 /* rtsig, aio, iocp */
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0
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168 rev->ready = 1;
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169 }
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170
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171 if (ev->deferred_accept) {
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172 rev->ready = 1;
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72
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173 #if (NGX_HAVE_KQUEUE)
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174 rev->available = 1;
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175 #endif
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0
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176 }
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177
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178 rev->log = log;
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179 wev->log = log;
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180
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181 /*
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110
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182 * TODO: MT: - ngx_atomic_fetch_add()
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0
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183 * or protection by critical section or light mutex
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184 *
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185 * TODO: MP: - allocated in a shared memory
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110
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186 * - ngx_atomic_fetch_add()
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0
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187 * or protection by critical section or light mutex
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188 */
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189
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110
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190 c->number = ngx_atomic_fetch_add(ngx_connection_counter, 1);
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0
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191
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44
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192 #if (NGX_STAT_STUB)
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110
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193 ngx_atomic_fetch_add(ngx_stat_handled, 1);
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44
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194 #endif
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195
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0
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196 #if (NGX_THREADS)
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197 rev->lock = &c->lock;
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198 wev->lock = &c->lock;
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199 rev->own_lock = &c->lock;
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200 wev->own_lock = &c->lock;
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201 #endif
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202
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92
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203 if (ls->addr_ntop) {
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382
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204 c->addr_text.data = ngx_pnalloc(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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126
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209
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400
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210 c->addr_text.len = ngx_sock_ntop(c->sockaddr, c->addr_text.data,
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92
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211 ls->addr_text_max_len);
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0
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212 if (c->addr_text.len == 0) {
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92
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213 ngx_close_accepted_connection(c);
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0
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214 return;
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215 }
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216 }
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217
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218 #if (NGX_DEBUG)
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219 {
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220
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221 in_addr_t i;
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214
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222 ngx_event_debug_t *dc;
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28
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223 struct sockaddr_in *sin;
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0
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224
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28
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225 sin = (struct sockaddr_in *) sa;
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214
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226 dc = ecf->debug_connection.elts;
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0
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227 for (i = 0; i < ecf->debug_connection.nelts; i++) {
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214
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228 if ((sin->sin_addr.s_addr & dc[i].mask) == dc[i].addr) {
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0
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229 log->log_level = NGX_LOG_DEBUG_CONNECTION|NGX_LOG_DEBUG_ALL;
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230 break;
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231 }
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232 }
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233
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234 }
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235 #endif
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236
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214
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237 ngx_log_debug3(NGX_LOG_DEBUG_EVENT, log, 0,
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238 "*%d accept: %V fd:%d", c->number, &c->addr_text, s);
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239
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0
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240 if (ngx_add_conn && (ngx_event_flags & NGX_USE_EPOLL_EVENT) == 0) {
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241 if (ngx_add_conn(c) == NGX_ERROR) {
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92
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242 ngx_close_accepted_connection(c);
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0
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243 return;
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244 }
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245 }
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246
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247 log->data = NULL;
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248 log->handler = NULL;
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249
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92
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250 ls->handler(c);
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0
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251
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4
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252 if (ngx_event_flags & NGX_USE_KQUEUE_EVENT) {
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0
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253 ev->available--;
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254 }
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255
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256 } while (ev->available);
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257 }
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258
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259
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42
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260 ngx_int_t
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261 ngx_trylock_accept_mutex(ngx_cycle_t *cycle)
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0
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262 {
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160
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263 if (ngx_shmtx_trylock(&ngx_accept_mutex)) {
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264
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0
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265 ngx_log_debug0(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
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266 "accept mutex locked");
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267
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236
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268 if (ngx_accept_mutex_held
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269 && ngx_accept_events == 0
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270 && !(ngx_event_flags & NGX_USE_RTSIG_EVENT))
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271 {
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122
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272 return NGX_OK;
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273 }
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0
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274
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122
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275 if (ngx_enable_accept_events(cycle) == NGX_ERROR) {
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160
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276 ngx_shmtx_unlock(&ngx_accept_mutex);
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122
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277 return NGX_ERROR;
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0
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278 }
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279
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236
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280 ngx_accept_events = 0;
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122
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281 ngx_accept_mutex_held = 1;
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282
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0
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283 return NGX_OK;
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284 }
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285
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236
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286 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
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287 "accept mutex lock failed: %ui", ngx_accept_mutex_held);
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288
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0
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289 if (ngx_accept_mutex_held) {
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290 if (ngx_disable_accept_events(cycle) == NGX_ERROR) {
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291 return NGX_ERROR;
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292 }
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293
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294 ngx_accept_mutex_held = 0;
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295 }
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296
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297 return NGX_OK;
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298 }
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299
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300
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122
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301 static ngx_int_t
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42
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302 ngx_enable_accept_events(ngx_cycle_t *cycle)
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0
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303 {
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92
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304 ngx_uint_t i;
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305 ngx_listening_t *ls;
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306 ngx_connection_t *c;
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0
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307
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92
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308 ls = cycle->listening.elts;
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0
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309 for (i = 0; i < cycle->listening.nelts; i++) {
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310
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92
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311 c = ls[i].connection;
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0
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312
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313 if (ngx_event_flags & NGX_USE_RTSIG_EVENT) {
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122
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314
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92
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315 if (ngx_add_conn(c) == NGX_ERROR) {
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0
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316 return NGX_ERROR;
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317 }
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318
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319 } else {
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92
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320 if (ngx_add_event(c->read, NGX_READ_EVENT, 0) == NGX_ERROR) {
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0
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321 return NGX_ERROR;
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322 }
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323 }
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324 }
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325
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326 return NGX_OK;
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327 }
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328
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329
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122
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330 static ngx_int_t
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42
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331 ngx_disable_accept_events(ngx_cycle_t *cycle)
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0
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332 {
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92
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333 ngx_uint_t i;
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334 ngx_listening_t *ls;
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335 ngx_connection_t *c;
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0
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336
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92
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337 ls = cycle->listening.elts;
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0
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338 for (i = 0; i < cycle->listening.nelts; i++) {
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339
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92
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340 c = ls[i].connection;
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341
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342 if (!c->read->active) {
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343 continue;
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344 }
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0
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345
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346 if (ngx_event_flags & NGX_USE_RTSIG_EVENT) {
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92
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347 if (ngx_del_conn(c, NGX_DISABLE_EVENT) == NGX_ERROR) {
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0
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348 return NGX_ERROR;
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349 }
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350
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351 } else {
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92
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352 if (ngx_del_event(c->read, NGX_READ_EVENT, NGX_DISABLE_EVENT)
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353 == NGX_ERROR)
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0
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354 {
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355 return NGX_ERROR;
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356 }
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357 }
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358 }
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359
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360 return NGX_OK;
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361 }
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362
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363
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42
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364 static void
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92
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365 ngx_close_accepted_connection(ngx_connection_t *c)
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0
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366 {
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92
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367 ngx_socket_t fd;
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368
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369 ngx_free_connection(c);
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370
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371 fd = c->fd;
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372 c->fd = (ngx_socket_t) -1;
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373
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374 if (ngx_close_socket(fd) == -1) {
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375 ngx_log_error(NGX_LOG_ALERT, c->log, ngx_socket_errno,
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0
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376 ngx_close_socket_n " failed");
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377 }
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44
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378
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92
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379 if (c->pool) {
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380 ngx_destroy_pool(c->pool);
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381 }
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382
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44
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383 #if (NGX_STAT_STUB)
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110
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384 ngx_atomic_fetch_add(ngx_stat_active, -1);
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44
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385 #endif
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0
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386 }
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387
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388
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92
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389 u_char *
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42
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390 ngx_accept_log_error(ngx_log_t *log, u_char *buf, size_t len)
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0
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391 {
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92
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392 return ngx_snprintf(buf, len, " while accepting new connection on %V",
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393 log->data);
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0
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394 }
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