0
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1
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2 /*
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3 * Copyright (C) Igor Sysoev
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660
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4 * Copyright (C) Nginx, Inc.
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0
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5 */
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6
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7
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8 #include <ngx_config.h>
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9 #include <ngx_core.h>
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10 #include <ngx_event.h>
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11
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12
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122
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13 static ngx_int_t ngx_enable_accept_events(ngx_cycle_t *cycle);
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14 static ngx_int_t ngx_disable_accept_events(ngx_cycle_t *cycle);
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92
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15 static void ngx_close_accepted_connection(ngx_connection_t *c);
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0
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16
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17
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42
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18 void
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19 ngx_event_accept(ngx_event_t *ev)
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0
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20 {
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236
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21 socklen_t socklen;
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32
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22 ngx_err_t err;
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23 ngx_log_t *log;
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674
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24 ngx_uint_t level;
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32
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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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448
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30 u_char sa[NGX_SOCKADDRLEN];
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608
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31 #if (NGX_HAVE_ACCEPT4)
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32 static ngx_uint_t use_accept4 = 1;
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33 #endif
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0
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34
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674
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35 if (ev->timedout) {
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36 if (ngx_enable_accept_events((ngx_cycle_t *) ngx_cycle) != NGX_OK) {
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37 return;
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38 }
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39
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40 ev->timedout = 0;
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41 }
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42
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0
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43 ecf = ngx_event_get_conf(ngx_cycle->conf_ctx, ngx_event_core_module);
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44
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45 if (ngx_event_flags & NGX_USE_RTSIG_EVENT) {
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46 ev->available = 1;
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47
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4
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48 } else if (!(ngx_event_flags & NGX_USE_KQUEUE_EVENT)) {
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0
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49 ev->available = ecf->multi_accept;
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50 }
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51
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92
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52 lc = ev->data;
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53 ls = lc->listening;
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54 ev->ready = 0;
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0
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55
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56 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, ev->log, 0,
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92
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57 "accept on %V, ready: %d", &ls->addr_text, ev->available);
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0
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58
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59 do {
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448
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60 socklen = NGX_SOCKADDRLEN;
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0
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61
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604
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62 #if (NGX_HAVE_ACCEPT4)
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608
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63 if (use_accept4) {
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64 s = accept4(lc->fd, (struct sockaddr *) sa, &socklen,
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65 SOCK_NONBLOCK);
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66 } else {
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67 s = accept(lc->fd, (struct sockaddr *) sa, &socklen);
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68 }
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604
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69 #else
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236
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70 s = accept(lc->fd, (struct sockaddr *) sa, &socklen);
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604
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71 #endif
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26
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72
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0
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73 if (s == -1) {
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74 err = ngx_socket_errno;
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75
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76 if (err == NGX_EAGAIN) {
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236
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77 ngx_log_debug0(NGX_LOG_DEBUG_EVENT, ev->log, err,
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78 "accept() not ready");
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0
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79 return;
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80 }
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81
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674
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82 level = NGX_LOG_ALERT;
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83
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84 if (err == NGX_ECONNABORTED) {
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85 level = NGX_LOG_ERR;
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86
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87 } else if (err == NGX_EMFILE || err == NGX_ENFILE) {
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88 level = NGX_LOG_CRIT;
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89 }
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90
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608
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91 #if (NGX_HAVE_ACCEPT4)
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674
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92 ngx_log_error(level, ev->log, err,
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608
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93 use_accept4 ? "accept4() failed" : "accept() failed");
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94
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95 if (use_accept4 && err == NGX_ENOSYS) {
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96 use_accept4 = 0;
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97 ngx_inherited_nonblocking = 0;
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98 continue;
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99 }
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100 #else
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674
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101 ngx_log_error(level, ev->log, err, "accept() failed");
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608
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102 #endif
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0
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103
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104 if (err == NGX_ECONNABORTED) {
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4
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105 if (ngx_event_flags & NGX_USE_KQUEUE_EVENT) {
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0
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106 ev->available--;
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107 }
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108
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109 if (ev->available) {
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110 continue;
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111 }
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112 }
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113
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674
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114 if (err == NGX_EMFILE || err == NGX_ENFILE) {
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115 if (ngx_disable_accept_events((ngx_cycle_t *) ngx_cycle)
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116 != NGX_OK)
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117 {
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118 return;
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119 }
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120
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121 if (ngx_use_accept_mutex) {
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122 if (ngx_accept_mutex_held) {
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123 ngx_shmtx_unlock(&ngx_accept_mutex);
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124 ngx_accept_mutex_held = 0;
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125 }
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126
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127 ngx_accept_disabled = 1;
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128
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129 } else {
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130 ngx_add_timer(ev, ecf->accept_mutex_delay);
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131 }
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132 }
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133
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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 #if (NGX_STAT_STUB)
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502
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138 (void) ngx_atomic_fetch_add(ngx_stat_accepted, 1);
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0
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139 #endif
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140
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412
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141 ngx_accept_disabled = ngx_cycle->connection_n / 8
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92
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142 - ngx_cycle->free_connection_n;
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143
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144 c = ngx_get_connection(s, ev->log);
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0
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145
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92
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146 if (c == NULL) {
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147 if (ngx_close_socket(s) == -1) {
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148 ngx_log_error(NGX_LOG_ALERT, ev->log, ngx_socket_errno,
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149 ngx_close_socket_n " failed");
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150 }
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0
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151
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92
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152 return;
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153 }
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154
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184
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155 #if (NGX_STAT_STUB)
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502
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156 (void) ngx_atomic_fetch_add(ngx_stat_active, 1);
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184
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157 #endif
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158
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92
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159 c->pool = ngx_create_pool(ls->pool_size, ev->log);
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160 if (c->pool == NULL) {
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161 ngx_close_accepted_connection(c);
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162 return;
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163 }
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0
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164
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236
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165 c->sockaddr = ngx_palloc(c->pool, socklen);
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92
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166 if (c->sockaddr == NULL) {
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167 ngx_close_accepted_connection(c);
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168 return;
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169 }
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170
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236
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171 ngx_memcpy(c->sockaddr, sa, socklen);
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92
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172
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173 log = ngx_palloc(c->pool, sizeof(ngx_log_t));
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174 if (log == NULL) {
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175 ngx_close_accepted_connection(c);
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0
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176 return;
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177 }
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178
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36
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179 /* set a blocking mode for aio and non-blocking mode for others */
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0
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180
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181 if (ngx_inherited_nonblocking) {
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92
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182 if (ngx_event_flags & NGX_USE_AIO_EVENT) {
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0
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183 if (ngx_blocking(s) == -1) {
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92
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184 ngx_log_error(NGX_LOG_ALERT, ev->log, ngx_socket_errno,
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0
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185 ngx_blocking_n " failed");
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92
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186 ngx_close_accepted_connection(c);
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0
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187 return;
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188 }
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189 }
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190
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191 } else {
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192 if (!(ngx_event_flags & (NGX_USE_AIO_EVENT|NGX_USE_RTSIG_EVENT))) {
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193 if (ngx_nonblocking(s) == -1) {
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92
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194 ngx_log_error(NGX_LOG_ALERT, ev->log, ngx_socket_errno,
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0
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195 ngx_nonblocking_n " failed");
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92
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196 ngx_close_accepted_connection(c);
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0
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197 return;
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198 }
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199 }
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200 }
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201
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92
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202 *log = ls->log;
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203
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204 c->recv = ngx_recv;
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205 c->send = ngx_send;
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126
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206 c->recv_chain = ngx_recv_chain;
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92
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207 c->send_chain = ngx_send_chain;
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0
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208
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92
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209 c->log = log;
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210 c->pool->log = log;
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0
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211
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448
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212 c->socklen = socklen;
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92
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213 c->listening = ls;
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448
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214 c->local_sockaddr = ls->sockaddr;
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92
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215
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216 c->unexpected_eof = 1;
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217
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538
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218 #if (NGX_HAVE_UNIX_DOMAIN)
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219 if (c->sockaddr->sa_family == AF_UNIX) {
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220 c->tcp_nopush = NGX_TCP_NOPUSH_DISABLED;
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221 c->tcp_nodelay = NGX_TCP_NODELAY_DISABLED;
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222 #if (NGX_SOLARIS)
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223 /* Solaris's sendfilev() supports AF_NCA, AF_INET, and AF_INET6 */
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224 c->sendfile = 0;
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225 #endif
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226 }
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227 #endif
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228
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110
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229 rev = c->read;
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230 wev = c->write;
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0
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231
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232 wev->ready = 1;
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233
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234 if (ngx_event_flags & (NGX_USE_AIO_EVENT|NGX_USE_RTSIG_EVENT)) {
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42
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235 /* rtsig, aio, iocp */
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0
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236 rev->ready = 1;
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237 }
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238
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239 if (ev->deferred_accept) {
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240 rev->ready = 1;
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72
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241 #if (NGX_HAVE_KQUEUE)
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242 rev->available = 1;
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243 #endif
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0
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244 }
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245
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246 rev->log = log;
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247 wev->log = log;
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248
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249 /*
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110
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250 * TODO: MT: - ngx_atomic_fetch_add()
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0
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251 * or protection by critical section or light mutex
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252 *
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253 * TODO: MP: - allocated in a shared memory
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110
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254 * - ngx_atomic_fetch_add()
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0
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255 * or protection by critical section or light mutex
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256 */
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257
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110
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258 c->number = ngx_atomic_fetch_add(ngx_connection_counter, 1);
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0
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259
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44
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260 #if (NGX_STAT_STUB)
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502
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261 (void) ngx_atomic_fetch_add(ngx_stat_handled, 1);
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44
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262 #endif
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263
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0
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264 #if (NGX_THREADS)
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265 rev->lock = &c->lock;
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266 wev->lock = &c->lock;
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267 rev->own_lock = &c->lock;
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268 wev->own_lock = &c->lock;
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269 #endif
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270
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92
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271 if (ls->addr_ntop) {
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382
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272 c->addr_text.data = ngx_pnalloc(c->pool, ls->addr_text_max_len);
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0
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273 if (c->addr_text.data == NULL) {
|
92
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274 ngx_close_accepted_connection(c);
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0
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275 return;
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276 }
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126
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277
|
400
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278 c->addr_text.len = ngx_sock_ntop(c->sockaddr, c->addr_text.data,
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448
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279 ls->addr_text_max_len, 0);
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0
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280 if (c->addr_text.len == 0) {
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92
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281 ngx_close_accepted_connection(c);
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0
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282 return;
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283 }
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284 }
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285
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286 #if (NGX_DEBUG)
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287 {
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288
|
674
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289 struct sockaddr_in *sin;
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290 ngx_cidr_t *cidr;
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291 ngx_uint_t i;
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292 #if (NGX_HAVE_INET6)
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293 struct sockaddr_in6 *sin6;
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294 ngx_uint_t n;
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295 #endif
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296
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297 cidr = ecf->debug_connection.elts;
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298 for (i = 0; i < ecf->debug_connection.nelts; i++) {
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299 if (cidr[i].family != c->sockaddr->sa_family) {
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300 goto next;
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301 }
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302
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303 switch (cidr[i].family) {
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0
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304
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674
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305 #if (NGX_HAVE_INET6)
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306 case AF_INET6:
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307 sin6 = (struct sockaddr_in6 *) c->sockaddr;
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308 for (n = 0; n < 16; n++) {
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309 if ((sin6->sin6_addr.s6_addr[n]
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310 & cidr[i].u.in6.mask.s6_addr[n])
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311 != cidr[i].u.in6.addr.s6_addr[n])
|
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312 {
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313 goto next;
|
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314 }
|
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315 }
|
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316 break;
|
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317 #endif
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318
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319 #if (NGX_HAVE_UNIX_DOMAIN)
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320 case AF_UNIX:
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321 break;
|
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322 #endif
|
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323
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324 default: /* AF_INET */
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325 sin = (struct sockaddr_in *) c->sockaddr;
|
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326 if ((sin->sin_addr.s_addr & cidr[i].u.in.mask)
|
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327 != cidr[i].u.in.addr)
|
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328 {
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329 goto next;
|
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330 }
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0
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331 break;
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332 }
|
674
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333
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334 log->log_level = NGX_LOG_DEBUG_CONNECTION|NGX_LOG_DEBUG_ALL;
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335 break;
|
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336
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337 next:
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338 continue;
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0
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339 }
|
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340
|
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341 }
|
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342 #endif
|
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343
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214
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344 ngx_log_debug3(NGX_LOG_DEBUG_EVENT, log, 0,
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345 "*%d accept: %V fd:%d", c->number, &c->addr_text, s);
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346
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0
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347 if (ngx_add_conn && (ngx_event_flags & NGX_USE_EPOLL_EVENT) == 0) {
|
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348 if (ngx_add_conn(c) == NGX_ERROR) {
|
92
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349 ngx_close_accepted_connection(c);
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0
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350 return;
|
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351 }
|
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352 }
|
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353
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354 log->data = NULL;
|
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355 log->handler = NULL;
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356
|
92
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357 ls->handler(c);
|
0
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358
|
4
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359 if (ngx_event_flags & NGX_USE_KQUEUE_EVENT) {
|
0
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360 ev->available--;
|
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361 }
|
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362
|
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363 } while (ev->available);
|
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364 }
|
|
365
|
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366
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42
|
367 ngx_int_t
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|
368 ngx_trylock_accept_mutex(ngx_cycle_t *cycle)
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0
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369 {
|
160
|
370 if (ngx_shmtx_trylock(&ngx_accept_mutex)) {
|
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371
|
0
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372 ngx_log_debug0(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
|
|
373 "accept mutex locked");
|
|
374
|
236
|
375 if (ngx_accept_mutex_held
|
|
376 && ngx_accept_events == 0
|
|
377 && !(ngx_event_flags & NGX_USE_RTSIG_EVENT))
|
|
378 {
|
122
|
379 return NGX_OK;
|
|
380 }
|
0
|
381
|
122
|
382 if (ngx_enable_accept_events(cycle) == NGX_ERROR) {
|
160
|
383 ngx_shmtx_unlock(&ngx_accept_mutex);
|
122
|
384 return NGX_ERROR;
|
0
|
385 }
|
|
386
|
236
|
387 ngx_accept_events = 0;
|
122
|
388 ngx_accept_mutex_held = 1;
|
|
389
|
0
|
390 return NGX_OK;
|
|
391 }
|
|
392
|
236
|
393 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
|
|
394 "accept mutex lock failed: %ui", ngx_accept_mutex_held);
|
|
395
|
0
|
396 if (ngx_accept_mutex_held) {
|
|
397 if (ngx_disable_accept_events(cycle) == NGX_ERROR) {
|
|
398 return NGX_ERROR;
|
|
399 }
|
|
400
|
|
401 ngx_accept_mutex_held = 0;
|
|
402 }
|
|
403
|
|
404 return NGX_OK;
|
|
405 }
|
|
406
|
|
407
|
122
|
408 static ngx_int_t
|
42
|
409 ngx_enable_accept_events(ngx_cycle_t *cycle)
|
0
|
410 {
|
92
|
411 ngx_uint_t i;
|
|
412 ngx_listening_t *ls;
|
|
413 ngx_connection_t *c;
|
0
|
414
|
92
|
415 ls = cycle->listening.elts;
|
0
|
416 for (i = 0; i < cycle->listening.nelts; i++) {
|
|
417
|
92
|
418 c = ls[i].connection;
|
0
|
419
|
674
|
420 if (c->read->active) {
|
|
421 continue;
|
|
422 }
|
|
423
|
0
|
424 if (ngx_event_flags & NGX_USE_RTSIG_EVENT) {
|
122
|
425
|
92
|
426 if (ngx_add_conn(c) == NGX_ERROR) {
|
0
|
427 return NGX_ERROR;
|
|
428 }
|
|
429
|
|
430 } else {
|
92
|
431 if (ngx_add_event(c->read, NGX_READ_EVENT, 0) == NGX_ERROR) {
|
0
|
432 return NGX_ERROR;
|
|
433 }
|
|
434 }
|
|
435 }
|
|
436
|
|
437 return NGX_OK;
|
|
438 }
|
|
439
|
|
440
|
122
|
441 static ngx_int_t
|
42
|
442 ngx_disable_accept_events(ngx_cycle_t *cycle)
|
0
|
443 {
|
92
|
444 ngx_uint_t i;
|
|
445 ngx_listening_t *ls;
|
|
446 ngx_connection_t *c;
|
0
|
447
|
92
|
448 ls = cycle->listening.elts;
|
0
|
449 for (i = 0; i < cycle->listening.nelts; i++) {
|
|
450
|
92
|
451 c = ls[i].connection;
|
|
452
|
|
453 if (!c->read->active) {
|
|
454 continue;
|
|
455 }
|
0
|
456
|
|
457 if (ngx_event_flags & NGX_USE_RTSIG_EVENT) {
|
92
|
458 if (ngx_del_conn(c, NGX_DISABLE_EVENT) == NGX_ERROR) {
|
0
|
459 return NGX_ERROR;
|
|
460 }
|
|
461
|
|
462 } else {
|
92
|
463 if (ngx_del_event(c->read, NGX_READ_EVENT, NGX_DISABLE_EVENT)
|
|
464 == NGX_ERROR)
|
0
|
465 {
|
|
466 return NGX_ERROR;
|
|
467 }
|
|
468 }
|
|
469 }
|
|
470
|
|
471 return NGX_OK;
|
|
472 }
|
|
473
|
|
474
|
42
|
475 static void
|
92
|
476 ngx_close_accepted_connection(ngx_connection_t *c)
|
0
|
477 {
|
92
|
478 ngx_socket_t fd;
|
|
479
|
|
480 ngx_free_connection(c);
|
|
481
|
|
482 fd = c->fd;
|
|
483 c->fd = (ngx_socket_t) -1;
|
|
484
|
|
485 if (ngx_close_socket(fd) == -1) {
|
|
486 ngx_log_error(NGX_LOG_ALERT, c->log, ngx_socket_errno,
|
0
|
487 ngx_close_socket_n " failed");
|
|
488 }
|
44
|
489
|
92
|
490 if (c->pool) {
|
|
491 ngx_destroy_pool(c->pool);
|
|
492 }
|
|
493
|
44
|
494 #if (NGX_STAT_STUB)
|
502
|
495 (void) ngx_atomic_fetch_add(ngx_stat_active, -1);
|
44
|
496 #endif
|
0
|
497 }
|
|
498
|
|
499
|
92
|
500 u_char *
|
42
|
501 ngx_accept_log_error(ngx_log_t *log, u_char *buf, size_t len)
|
0
|
502 {
|
92
|
503 return ngx_snprintf(buf, len, " while accepting new connection on %V",
|
|
504 log->data);
|
0
|
505 }
|