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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
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11
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12 static void ngx_close_accepted_socket(ngx_socket_t s, ngx_log_t *log);
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32
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13 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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14
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15
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42
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16 void
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17 ngx_event_accept(ngx_event_t *ev)
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0
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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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42
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56 * case and besides the pool can be got from the free pool list.
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0
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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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42
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120 ngx_atomic_inc(ngx_stat_accepted);
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44
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121 ngx_atomic_inc(ngx_stat_active);
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0
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122 #endif
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123
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124 ngx_accept_disabled = (ngx_uint_t) s + NGX_ACCEPT_THRESHOLD
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125 - ecf->connections;
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126
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127 /* disable warning: Win32 SOCKET is u_int while UNIX socket is int */
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128
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129 if ((ngx_uint_t) s >= ecf->connections) {
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130
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131 ngx_log_error(NGX_LOG_ALERT, ev->log, 0,
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10
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132 "accept() on %V returned socket #%d while "
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0
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133 "only %d connections was configured, "
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134 "closing the connection",
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10
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135 &ls->listening->addr_text, s, ecf->connections);
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0
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136
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137 ngx_close_accepted_socket(s, log);
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138 ngx_destroy_pool(pool);
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139 return;
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140 }
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141
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36
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142 /* set a blocking mode for aio and non-blocking mode for others */
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0
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143
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144 if (ngx_inherited_nonblocking) {
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145 if ((ngx_event_flags & NGX_USE_AIO_EVENT)) {
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146 if (ngx_blocking(s) == -1) {
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147 ngx_log_error(NGX_LOG_ALERT, log, ngx_socket_errno,
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148 ngx_blocking_n " failed");
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149
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150 ngx_close_accepted_socket(s, log);
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151 ngx_destroy_pool(pool);
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152 return;
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153 }
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154 }
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155
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156 } else {
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157 if (!(ngx_event_flags & (NGX_USE_AIO_EVENT|NGX_USE_RTSIG_EVENT))) {
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158 if (ngx_nonblocking(s) == -1) {
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159 ngx_log_error(NGX_LOG_ALERT, log, ngx_socket_errno,
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160 ngx_nonblocking_n " failed");
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161
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162 ngx_close_accepted_socket(s, log);
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163 ngx_destroy_pool(pool);
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164 return;
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165 }
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166 }
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167 }
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168
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10
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169 #if (NGX_WIN32)
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0
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170 /*
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171 * Winsock assignes a socket number divisible by 4
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172 * so to find a connection we divide a socket number by 4.
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173 */
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174
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175 if (s % 4) {
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176 ngx_log_error(NGX_LOG_EMERG, ev->log, 0,
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10
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177 "accept() on %V returned socket #%d, "
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0
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178 "not divisible by 4",
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10
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179 &ls->listening->addr_text, s);
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0
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180 exit(1);
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181 }
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182
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183 c = &ngx_cycle->connections[s / 4];
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184 rev = &ngx_cycle->read_events[s / 4];
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185 wev = &ngx_cycle->write_events[s / 4];
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186 #else
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187 c = &ngx_cycle->connections[s];
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188 rev = &ngx_cycle->read_events[s];
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189 wev = &ngx_cycle->write_events[s];
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190 #endif
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191
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192 instance = rev->instance;
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193
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194 #if (NGX_THREADS)
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195
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196 if (*(&c->lock)) {
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197 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, ev->log, 0,
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198 "spinlock in accept, fd:%", s);
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199 ngx_spinlock(&c->lock, 1000);
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200 ngx_unlock(&c->lock);
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201 }
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202
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203 #endif
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204
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205 ngx_memzero(rev, sizeof(ngx_event_t));
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206 ngx_memzero(wev, sizeof(ngx_event_t));
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207 ngx_memzero(c, sizeof(ngx_connection_t));
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208
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209 c->pool = pool;
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210
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211 c->listening = ls->listening;
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212 c->sockaddr = sa;
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213 c->socklen = len;
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214
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215 rev->instance = !instance;
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216 wev->instance = !instance;
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217
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218 rev->index = NGX_INVALID_INDEX;
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219 wev->index = NGX_INVALID_INDEX;
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220
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221 rev->data = c;
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222 wev->data = c;
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223
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224 c->read = rev;
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225 c->write = wev;
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226
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227 c->fd = s;
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228 c->unexpected_eof = 1;
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229
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230 wev->write = 1;
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231 wev->ready = 1;
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232
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233 if (ngx_event_flags & (NGX_USE_AIO_EVENT|NGX_USE_RTSIG_EVENT)) {
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42
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234 /* rtsig, aio, iocp */
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0
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235 rev->ready = 1;
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236 }
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237
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238 if (ev->deferred_accept) {
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239 rev->ready = 1;
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240 }
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241
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242 c->ctx = ls->ctx;
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243 c->servers = ls->servers;
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244
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245 c->recv = ngx_recv;
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246 c->send_chain = ngx_send_chain;
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247
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248 c->log = log;
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249 rev->log = log;
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250 wev->log = log;
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251
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252 /*
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253 * TODO: MT: - atomic increment (x86: lock xadd)
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254 * or protection by critical section or light mutex
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255 *
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256 * TODO: MP: - allocated in a shared memory
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257 * - atomic increment (x86: lock xadd)
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258 * or protection by critical section or light mutex
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259 */
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260
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261 c->number = ngx_atomic_inc(ngx_connection_counter);
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262
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44
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263 #if (NGX_STAT_STUB)
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264 ngx_atomic_inc(ngx_stat_handled);
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265 #endif
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266
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0
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267 #if (NGX_THREADS)
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268 rev->lock = &c->lock;
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269 wev->lock = &c->lock;
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270 rev->own_lock = &c->lock;
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271 wev->own_lock = &c->lock;
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272 #endif
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273
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274 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, ev->log, 0,
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275 "accept: fd:%d c:%d", s, c->number);
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276
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277 if (c->listening->addr_ntop) {
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278 c->addr_text.data = ngx_palloc(c->pool,
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279 c->listening->addr_text_max_len);
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280 if (c->addr_text.data == NULL) {
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281 ngx_close_accepted_socket(s, log);
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282 ngx_destroy_pool(pool);
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283 return;
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284 }
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285
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286 c->addr_text.len = ngx_sock_ntop(c->listening->family, c->sockaddr,
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287 c->addr_text.data,
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288 c->listening->addr_text_max_len);
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289 if (c->addr_text.len == 0) {
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290 ngx_close_accepted_socket(s, log);
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291 ngx_destroy_pool(pool);
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292 return;
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293 }
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294 }
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295
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296 #if (NGX_DEBUG)
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297 {
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298
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299 uint32_t *addr;
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300 in_addr_t i;
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28
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301 struct sockaddr_in *sin;
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0
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302
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28
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303 sin = (struct sockaddr_in *) sa;
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0
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304 addr = ecf->debug_connection.elts;
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305 for (i = 0; i < ecf->debug_connection.nelts; i++) {
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28
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306 if (addr[i] == sin->sin_addr.s_addr) {
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0
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307 log->log_level = NGX_LOG_DEBUG_CONNECTION|NGX_LOG_DEBUG_ALL;
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308 break;
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309 }
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310 }
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311
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312 }
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313 #endif
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314
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315 if (ngx_add_conn && (ngx_event_flags & NGX_USE_EPOLL_EVENT) == 0) {
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316 if (ngx_add_conn(c) == NGX_ERROR) {
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317 ngx_close_accepted_socket(s, log);
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318 ngx_destroy_pool(pool);
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319 return;
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320 }
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321 }
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322
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323 pool = NULL;
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324
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325 log->data = NULL;
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326 log->handler = NULL;
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327
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328 ls->listening->handler(c);
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329
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4
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330 if (ngx_event_flags & NGX_USE_KQUEUE_EVENT) {
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0
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331 ev->available--;
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332 }
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333
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334 accepted++;
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335
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336 } while (ev->available);
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337 }
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338
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339
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42
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340 ngx_int_t
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341 ngx_trylock_accept_mutex(ngx_cycle_t *cycle)
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0
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342 {
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343 if (*ngx_accept_mutex == 0
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344 && ngx_atomic_cmp_set(ngx_accept_mutex, 0, ngx_pid))
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345 {
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346 ngx_log_debug0(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
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347 "accept mutex locked");
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348
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349 if (!ngx_accept_mutex_held) {
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350 if (ngx_enable_accept_events(cycle) == NGX_ERROR) {
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351 *ngx_accept_mutex = 0;
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352 return NGX_ERROR;
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353 }
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354
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355 ngx_accept_mutex_held = 1;
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356 }
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357
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358 return NGX_OK;
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359 }
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360
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361 if (ngx_accept_mutex_held) {
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362 if (ngx_disable_accept_events(cycle) == NGX_ERROR) {
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363 return NGX_ERROR;
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364 }
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365
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366 ngx_accept_mutex_held = 0;
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367 }
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368
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369 return NGX_OK;
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370 }
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371
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372
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42
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373 ngx_int_t
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374 ngx_enable_accept_events(ngx_cycle_t *cycle)
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0
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375 {
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376 ngx_uint_t i;
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377 ngx_listening_t *s;
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378
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379 s = cycle->listening.elts;
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380 for (i = 0; i < cycle->listening.nelts; i++) {
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381
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382 /*
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383 * we do not need to handle the Winsock sockets here (divide a socket
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384 * number by 4) because this function would never called
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385 * in the Winsock environment
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386 */
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387
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388 if (ngx_event_flags & NGX_USE_RTSIG_EVENT) {
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389 if (ngx_add_conn(&cycle->connections[s[i].fd]) == NGX_ERROR) {
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390 return NGX_ERROR;
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391 }
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392
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393 } else {
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394 if (ngx_add_event(&cycle->read_events[s[i].fd], NGX_READ_EVENT, 0)
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395 == NGX_ERROR)
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396 {
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397 return NGX_ERROR;
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398 }
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399 }
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400 }
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401
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402 return NGX_OK;
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403 }
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404
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405
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42
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406 ngx_int_t
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407 ngx_disable_accept_events(ngx_cycle_t *cycle)
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0
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408 {
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409 ngx_uint_t i;
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410 ngx_listening_t *s;
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411
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412 s = cycle->listening.elts;
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413 for (i = 0; i < cycle->listening.nelts; i++) {
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414
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415 /*
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416 * we do not need to handle the Winsock sockets here (divide a socket
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417 * number by 4) because this function would never called
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418 * in the Winsock environment
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419 */
|
|
|
420
|
|
|
421 if (ngx_event_flags & NGX_USE_RTSIG_EVENT) {
|
|
|
422 if (!cycle->connections[s[i].fd].read->active) {
|
|
|
423 continue;
|
|
|
424 }
|
|
|
425
|
|
|
426 if (ngx_del_conn(&cycle->connections[s[i].fd], NGX_DISABLE_EVENT)
|
|
|
427 == NGX_ERROR)
|
|
|
428 {
|
|
|
429 return NGX_ERROR;
|
|
|
430 }
|
|
|
431
|
|
|
432 } else {
|
|
|
433 if (!cycle->read_events[s[i].fd].active) {
|
|
|
434 continue;
|
|
|
435 }
|
|
|
436
|
|
|
437 if (ngx_del_event(&cycle->read_events[s[i].fd], NGX_READ_EVENT,
|
|
|
438 NGX_DISABLE_EVENT) == NGX_ERROR)
|
|
|
439 {
|
|
|
440 return NGX_ERROR;
|
|
|
441 }
|
|
|
442 }
|
|
|
443 }
|
|
|
444
|
|
|
445 return NGX_OK;
|
|
|
446 }
|
|
|
447
|
|
|
448
|
|
42
|
449 static void
|
|
|
450 ngx_close_accepted_socket(ngx_socket_t s, ngx_log_t *log)
|
|
0
|
451 {
|
|
|
452 if (ngx_close_socket(s) == -1) {
|
|
|
453 ngx_log_error(NGX_LOG_ALERT, log, ngx_socket_errno,
|
|
|
454 ngx_close_socket_n " failed");
|
|
|
455 }
|
|
44
|
456
|
|
|
457 #if (NGX_STAT_STUB)
|
|
|
458 ngx_atomic_dec(ngx_stat_active);
|
|
|
459 #endif
|
|
0
|
460 }
|
|
|
461
|
|
|
462
|
|
42
|
463 static u_char *
|
|
|
464 ngx_accept_log_error(ngx_log_t *log, u_char *buf, size_t len)
|
|
0
|
465 {
|
|
32
|
466 return ngx_snprintf(buf, len, " while accept() on %V", log->data);
|
|
0
|
467 }
|
