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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 #include <nginx.h>
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11
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12
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13 static void ngx_close_accepted_socket(ngx_socket_t s, ngx_log_t *log);
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32
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14 static u_char *ngx_accept_log_error(ngx_log_t *log, u_char *buf, size_t len);
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0
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15
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16
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17 void ngx_event_accept(ngx_event_t *ev)
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18 {
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32
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19 ngx_uint_t instance, accepted;
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20 socklen_t len;
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21 struct sockaddr *sa;
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22 ngx_err_t err;
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23 ngx_log_t *log;
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24 ngx_pool_t *pool;
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25 ngx_socket_t s;
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26 ngx_event_t *rev, *wev;
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27 ngx_connection_t *c, *ls;
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28 ngx_event_conf_t *ecf;
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0
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29
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30 ecf = ngx_event_get_conf(ngx_cycle->conf_ctx, ngx_event_core_module);
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31
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32 if (ngx_event_flags & NGX_USE_RTSIG_EVENT) {
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33 ev->available = 1;
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34
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4
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35 } else if (!(ngx_event_flags & NGX_USE_KQUEUE_EVENT)) {
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0
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36 ev->available = ecf->multi_accept;
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37 }
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38
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39 ls = ev->data;
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40
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41 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, ev->log, 0,
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10
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42 "accept on %V, ready: %d",
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43 &ls->listening->addr_text, ev->available);
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0
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44
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45 ev->ready = 0;
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46 accepted = 0;
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47 pool = NULL;
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48
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49 do {
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50
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51 if (pool == NULL) {
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52
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53 /*
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54 * Create the pool before accept() to avoid the copying of
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55 * the sockaddr. Although accept() can fail it is uncommon
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56 * case and besides the pool can be got from the free pool list
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57 */
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58
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59 if (!(pool = ngx_create_pool(ls->listening->pool_size, ev->log))) {
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60 return;
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61 }
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62 }
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63
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64 if (!(sa = ngx_palloc(pool, ls->listening->socklen))) {
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65 ngx_destroy_pool(pool);
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66 return;
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67 }
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68
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69 if (!(log = ngx_palloc(pool, sizeof(ngx_log_t)))) {
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70 ngx_destroy_pool(pool);
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71 return;
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72 }
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73
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74 ngx_memcpy(log, ls->log, sizeof(ngx_log_t));
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75 pool->log = log;
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76
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32
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77 log->data = &ls->listening->addr_text;
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0
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78 log->handler = ngx_accept_log_error;
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79
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80 len = ls->listening->socklen;
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81
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82 s = accept(ls->fd, sa, &len);
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26
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83
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0
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84 if (s == -1) {
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85 err = ngx_socket_errno;
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86
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87 if (err == NGX_EAGAIN) {
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88 #if 0
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89 if (!(ngx_event_flags & NGX_USE_RTSIG_EVENT))
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90 {
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91 ngx_log_error(NGX_LOG_NOTICE, log, err,
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92 "EAGAIN after %d accepted connection(s)",
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93 accepted);
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94 }
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95 #endif
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96
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97 ngx_destroy_pool(pool);
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98 return;
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99 }
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100
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101 ngx_log_error(NGX_LOG_ALERT, ev->log, err,
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10
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102 "accept() on %V failed", &ls->listening->addr_text);
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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 /* reuse the previously allocated pool */
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111 continue;
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112 }
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113 }
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114
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115 ngx_destroy_pool(pool);
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116 return;
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117 }
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118
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119 #if (NGX_STAT_STUB)
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120 (*ngx_stat_accepted)++;
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121 #endif
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122
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123 ngx_accept_disabled = (ngx_uint_t) s + NGX_ACCEPT_THRESHOLD
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124 - ecf->connections;
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125
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126 /* disable warning: Win32 SOCKET is u_int while UNIX socket is int */
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127
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128 if ((ngx_uint_t) s >= ecf->connections) {
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129
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130 ngx_log_error(NGX_LOG_ALERT, ev->log, 0,
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10
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131 "accept() on %V returned socket #%d while "
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0
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132 "only %d connections was configured, "
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133 "closing the connection",
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10
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134 &ls->listening->addr_text, s, ecf->connections);
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0
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135
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136 ngx_close_accepted_socket(s, log);
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137 ngx_destroy_pool(pool);
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138 return;
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139 }
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140
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141 #if (NGX_STAT_STUB)
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142 (*ngx_stat_active)++;
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143 #endif
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144
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145 /* set a blocking mode for aio and non-blocking mode for the others */
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146
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147 if (ngx_inherited_nonblocking) {
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148 if ((ngx_event_flags & NGX_USE_AIO_EVENT)) {
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149 if (ngx_blocking(s) == -1) {
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150 ngx_log_error(NGX_LOG_ALERT, log, ngx_socket_errno,
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151 ngx_blocking_n " failed");
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152
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153 ngx_close_accepted_socket(s, log);
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154 ngx_destroy_pool(pool);
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155 return;
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156 }
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157 }
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158
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159 } else {
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160 if (!(ngx_event_flags & (NGX_USE_AIO_EVENT|NGX_USE_RTSIG_EVENT))) {
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161 if (ngx_nonblocking(s) == -1) {
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162 ngx_log_error(NGX_LOG_ALERT, log, ngx_socket_errno,
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163 ngx_nonblocking_n " failed");
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164
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165 ngx_close_accepted_socket(s, log);
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166 ngx_destroy_pool(pool);
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167 return;
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168 }
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169 }
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170 }
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171
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10
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172 #if (NGX_WIN32)
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0
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173 /*
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174 * Winsock assignes a socket number divisible by 4
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175 * so to find a connection we divide a socket number by 4.
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176 */
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177
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178 if (s % 4) {
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179 ngx_log_error(NGX_LOG_EMERG, ev->log, 0,
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10
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180 "accept() on %V returned socket #%d, "
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0
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181 "not divisible by 4",
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10
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182 &ls->listening->addr_text, s);
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0
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183 exit(1);
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184 }
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185
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186 c = &ngx_cycle->connections[s / 4];
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187 rev = &ngx_cycle->read_events[s / 4];
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188 wev = &ngx_cycle->write_events[s / 4];
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189 #else
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190 c = &ngx_cycle->connections[s];
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191 rev = &ngx_cycle->read_events[s];
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192 wev = &ngx_cycle->write_events[s];
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193 #endif
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194
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195 instance = rev->instance;
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196
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197 #if (NGX_THREADS)
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198
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199 if (*(&c->lock)) {
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200 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, ev->log, 0,
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201 "spinlock in accept, fd:%", s);
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202 ngx_spinlock(&c->lock, 1000);
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203 ngx_unlock(&c->lock);
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204 }
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205
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206 #endif
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207
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208 ngx_memzero(rev, sizeof(ngx_event_t));
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209 ngx_memzero(wev, sizeof(ngx_event_t));
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210 ngx_memzero(c, sizeof(ngx_connection_t));
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211
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212 c->pool = pool;
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213
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214 c->listening = ls->listening;
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215 c->sockaddr = sa;
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216 c->socklen = len;
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217
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218 rev->instance = !instance;
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219 wev->instance = !instance;
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220
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221 rev->index = NGX_INVALID_INDEX;
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222 wev->index = NGX_INVALID_INDEX;
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223
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224 rev->data = c;
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225 wev->data = c;
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226
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227 c->read = rev;
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228 c->write = wev;
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229
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230 c->fd = s;
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231 c->unexpected_eof = 1;
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232
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233 wev->write = 1;
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234 wev->ready = 1;
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235
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236 if (ngx_event_flags & (NGX_USE_AIO_EVENT|NGX_USE_RTSIG_EVENT)) {
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237 /* epoll, rtsig, aio, iocp */
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238 rev->ready = 1;
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239 }
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240
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241 if (ev->deferred_accept) {
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242 rev->ready = 1;
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243 }
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244
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245 c->ctx = ls->ctx;
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246 c->servers = ls->servers;
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247
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248 c->recv = ngx_recv;
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249 c->send_chain = ngx_send_chain;
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250
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251 c->log = log;
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252 rev->log = log;
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253 wev->log = log;
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254
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255 /*
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256 * TODO: MT: - atomic increment (x86: lock xadd)
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257 * or protection by critical section or light mutex
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258 *
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259 * TODO: MP: - allocated in a shared memory
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260 * - atomic increment (x86: lock xadd)
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261 * or protection by critical section or light mutex
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262 */
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263
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264 c->number = ngx_atomic_inc(ngx_connection_counter);
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265
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266 #if (NGX_THREADS)
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267 rev->lock = &c->lock;
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268 wev->lock = &c->lock;
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269 rev->own_lock = &c->lock;
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270 wev->own_lock = &c->lock;
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271 #endif
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272
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273 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, ev->log, 0,
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274 "accept: fd:%d c:%d", s, c->number);
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275
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276 if (c->listening->addr_ntop) {
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277 c->addr_text.data = ngx_palloc(c->pool,
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278 c->listening->addr_text_max_len);
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279 if (c->addr_text.data == NULL) {
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280 ngx_close_accepted_socket(s, log);
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281 ngx_destroy_pool(pool);
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282 return;
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283 }
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284
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285 c->addr_text.len = ngx_sock_ntop(c->listening->family, c->sockaddr,
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286 c->addr_text.data,
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287 c->listening->addr_text_max_len);
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288 if (c->addr_text.len == 0) {
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289 ngx_close_accepted_socket(s, log);
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290 ngx_destroy_pool(pool);
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291 return;
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292 }
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293 }
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294
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295 #if (NGX_DEBUG)
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296 {
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297
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298 uint32_t *addr;
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299 in_addr_t i;
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28
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300 struct sockaddr_in *sin;
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0
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301
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28
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302 sin = (struct sockaddr_in *) sa;
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0
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303 addr = ecf->debug_connection.elts;
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304 for (i = 0; i < ecf->debug_connection.nelts; i++) {
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28
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305 if (addr[i] == sin->sin_addr.s_addr) {
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0
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306 log->log_level = NGX_LOG_DEBUG_CONNECTION|NGX_LOG_DEBUG_ALL;
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307 break;
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308 }
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309 }
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310
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311 }
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312 #endif
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313
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314 if (ngx_add_conn && (ngx_event_flags & NGX_USE_EPOLL_EVENT) == 0) {
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315 if (ngx_add_conn(c) == NGX_ERROR) {
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316 ngx_close_accepted_socket(s, log);
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317 ngx_destroy_pool(pool);
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318 return;
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319 }
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320 }
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321
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322 pool = NULL;
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323
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324 log->data = NULL;
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325 log->handler = NULL;
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326
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327 ls->listening->handler(c);
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328
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4
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329 if (ngx_event_flags & NGX_USE_KQUEUE_EVENT) {
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0
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330 ev->available--;
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331 }
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332
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333 accepted++;
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334
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335 } while (ev->available);
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336 }
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337
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338
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339 ngx_int_t ngx_trylock_accept_mutex(ngx_cycle_t *cycle)
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340 {
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341 if (*ngx_accept_mutex == 0
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342 && ngx_atomic_cmp_set(ngx_accept_mutex, 0, ngx_pid))
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343 {
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344 ngx_log_debug0(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
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345 "accept mutex locked");
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346
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347 if (!ngx_accept_mutex_held) {
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348 if (ngx_enable_accept_events(cycle) == NGX_ERROR) {
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349 *ngx_accept_mutex = 0;
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350 return NGX_ERROR;
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351 }
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352
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353 ngx_accept_mutex_held = 1;
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354 }
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355
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356 return NGX_OK;
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357 }
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358
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359 if (ngx_accept_mutex_held) {
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360 if (ngx_disable_accept_events(cycle) == NGX_ERROR) {
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361 return NGX_ERROR;
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362 }
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363
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364 ngx_accept_mutex_held = 0;
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365 }
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366
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367 return NGX_OK;
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368 }
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369
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370
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371 ngx_int_t ngx_enable_accept_events(ngx_cycle_t *cycle)
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372 {
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373 ngx_uint_t i;
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374 ngx_listening_t *s;
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375
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376 s = cycle->listening.elts;
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377 for (i = 0; i < cycle->listening.nelts; i++) {
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378
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379 /*
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380 * we do not need to handle the Winsock sockets here (divide a socket
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381 * number by 4) because this function would never called
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382 * in the Winsock environment
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383 */
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384
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385 if (ngx_event_flags & NGX_USE_RTSIG_EVENT) {
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386 if (ngx_add_conn(&cycle->connections[s[i].fd]) == NGX_ERROR) {
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387 return NGX_ERROR;
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388 }
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389
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390 } else {
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391 if (ngx_add_event(&cycle->read_events[s[i].fd], NGX_READ_EVENT, 0)
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392 == NGX_ERROR)
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393 {
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394 return NGX_ERROR;
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395 }
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396 }
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397 }
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398
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399 return NGX_OK;
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400 }
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401
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402
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403 ngx_int_t ngx_disable_accept_events(ngx_cycle_t *cycle)
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404 {
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405 ngx_uint_t i;
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406 ngx_listening_t *s;
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407
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408 s = cycle->listening.elts;
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409 for (i = 0; i < cycle->listening.nelts; i++) {
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410
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411 /*
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412 * we do not need to handle the Winsock sockets here (divide a socket
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413 * number by 4) because this function would never called
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414 * in the Winsock environment
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415 */
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416
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417 if (ngx_event_flags & NGX_USE_RTSIG_EVENT) {
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418 if (!cycle->connections[s[i].fd].read->active) {
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419 continue;
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420 }
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421
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422 if (ngx_del_conn(&cycle->connections[s[i].fd], NGX_DISABLE_EVENT)
|
|
|
423 == NGX_ERROR)
|
|
|
424 {
|
|
|
425 return NGX_ERROR;
|
|
|
426 }
|
|
|
427
|
|
|
428 } else {
|
|
|
429 if (!cycle->read_events[s[i].fd].active) {
|
|
|
430 continue;
|
|
|
431 }
|
|
|
432
|
|
|
433 if (ngx_del_event(&cycle->read_events[s[i].fd], NGX_READ_EVENT,
|
|
|
434 NGX_DISABLE_EVENT) == NGX_ERROR)
|
|
|
435 {
|
|
|
436 return NGX_ERROR;
|
|
|
437 }
|
|
|
438 }
|
|
|
439 }
|
|
|
440
|
|
|
441 return NGX_OK;
|
|
|
442 }
|
|
|
443
|
|
|
444
|
|
|
445 static void ngx_close_accepted_socket(ngx_socket_t s, ngx_log_t *log)
|
|
|
446 {
|
|
|
447 if (ngx_close_socket(s) == -1) {
|
|
|
448 ngx_log_error(NGX_LOG_ALERT, log, ngx_socket_errno,
|
|
|
449 ngx_close_socket_n " failed");
|
|
|
450 }
|
|
|
451 }
|
|
|
452
|
|
|
453
|
|
32
|
454 static u_char *ngx_accept_log_error(ngx_log_t *log, u_char *buf, size_t len)
|
|
0
|
455 {
|
|
32
|
456 return ngx_snprintf(buf, len, " while accept() on %V", log->data);
|
|
0
|
457 }
|
