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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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50
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19 ngx_uint_t instance;
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20 #if 0
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21 ngx_uint_t accepted;
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22 #endif
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32
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23 socklen_t len;
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24 struct sockaddr *sa;
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25 ngx_err_t err;
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26 ngx_log_t *log;
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27 ngx_pool_t *pool;
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28 ngx_socket_t s;
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29 ngx_event_t *rev, *wev;
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30 ngx_connection_t *c, *ls;
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31 ngx_event_conf_t *ecf;
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0
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32
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33 ecf = ngx_event_get_conf(ngx_cycle->conf_ctx, ngx_event_core_module);
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34
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35 if (ngx_event_flags & NGX_USE_RTSIG_EVENT) {
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36 ev->available = 1;
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37
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4
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38 } else if (!(ngx_event_flags & NGX_USE_KQUEUE_EVENT)) {
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0
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39 ev->available = ecf->multi_accept;
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40 }
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41
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42 ls = ev->data;
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43
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44 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, ev->log, 0,
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10
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45 "accept on %V, ready: %d",
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46 &ls->listening->addr_text, ev->available);
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0
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47
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48 ev->ready = 0;
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50
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49 pool = NULL;
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50 #if 0
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0
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51 accepted = 0;
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50
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52 #endif
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0
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53
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54 do {
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55
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56 if (pool == NULL) {
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57
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58 /*
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59 * Create the pool before accept() to avoid the copying of
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60 * the sockaddr. Although accept() can fail it is uncommon
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42
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61 * case and besides the pool can be got from the free pool list.
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0
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62 */
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63
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50
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64 pool = ngx_create_pool(ls->listening->pool_size, ev->log);
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65 if (pool == NULL) {
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0
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66 return;
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67 }
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68 }
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69
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50
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70 sa = ngx_palloc(pool, ls->listening->socklen);
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71 if (sa == NULL) {
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0
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72 ngx_destroy_pool(pool);
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73 return;
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74 }
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75
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50
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76 log = ngx_palloc(pool, sizeof(ngx_log_t));
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77 if (log == NULL) {
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0
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78 ngx_destroy_pool(pool);
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79 return;
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80 }
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81
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82 ngx_memcpy(log, ls->log, sizeof(ngx_log_t));
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83 pool->log = log;
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84
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32
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85 log->data = &ls->listening->addr_text;
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0
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86 log->handler = ngx_accept_log_error;
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87
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88 len = ls->listening->socklen;
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89
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90 s = accept(ls->fd, sa, &len);
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26
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91
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0
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92 if (s == -1) {
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93 err = ngx_socket_errno;
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94
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95 if (err == NGX_EAGAIN) {
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96 #if 0
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97 if (!(ngx_event_flags & NGX_USE_RTSIG_EVENT))
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98 {
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99 ngx_log_error(NGX_LOG_NOTICE, log, err,
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100 "EAGAIN after %d accepted connection(s)",
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101 accepted);
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102 }
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103 #endif
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104
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105 ngx_destroy_pool(pool);
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106 return;
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107 }
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108
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109 ngx_log_error(NGX_LOG_ALERT, ev->log, err,
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10
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110 "accept() on %V failed", &ls->listening->addr_text);
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0
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111
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112 if (err == NGX_ECONNABORTED) {
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4
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113 if (ngx_event_flags & NGX_USE_KQUEUE_EVENT) {
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0
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114 ev->available--;
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115 }
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116
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117 if (ev->available) {
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118 /* reuse the previously allocated pool */
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119 continue;
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120 }
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121 }
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122
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123 ngx_destroy_pool(pool);
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124 return;
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125 }
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126
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127 #if (NGX_STAT_STUB)
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42
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128 ngx_atomic_inc(ngx_stat_accepted);
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44
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129 ngx_atomic_inc(ngx_stat_active);
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0
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130 #endif
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131
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132 ngx_accept_disabled = (ngx_uint_t) s + NGX_ACCEPT_THRESHOLD
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133 - ecf->connections;
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134
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135 /* disable warning: Win32 SOCKET is u_int while UNIX socket is int */
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136
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137 if ((ngx_uint_t) s >= ecf->connections) {
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138
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139 ngx_log_error(NGX_LOG_ALERT, ev->log, 0,
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10
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140 "accept() on %V returned socket #%d while "
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0
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141 "only %d connections was configured, "
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142 "closing the connection",
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10
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143 &ls->listening->addr_text, s, ecf->connections);
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0
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144
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145 ngx_close_accepted_socket(s, log);
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146 ngx_destroy_pool(pool);
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147 return;
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148 }
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149
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36
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150 /* set a blocking mode for aio and non-blocking mode for others */
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0
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151
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152 if (ngx_inherited_nonblocking) {
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153 if ((ngx_event_flags & NGX_USE_AIO_EVENT)) {
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154 if (ngx_blocking(s) == -1) {
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155 ngx_log_error(NGX_LOG_ALERT, log, ngx_socket_errno,
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156 ngx_blocking_n " failed");
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157
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158 ngx_close_accepted_socket(s, log);
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159 ngx_destroy_pool(pool);
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160 return;
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161 }
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162 }
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163
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164 } else {
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165 if (!(ngx_event_flags & (NGX_USE_AIO_EVENT|NGX_USE_RTSIG_EVENT))) {
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166 if (ngx_nonblocking(s) == -1) {
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167 ngx_log_error(NGX_LOG_ALERT, log, ngx_socket_errno,
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168 ngx_nonblocking_n " failed");
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169
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170 ngx_close_accepted_socket(s, log);
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171 ngx_destroy_pool(pool);
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172 return;
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173 }
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174 }
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175 }
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176
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10
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177 #if (NGX_WIN32)
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0
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178 /*
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179 * Winsock assignes a socket number divisible by 4
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180 * so to find a connection we divide a socket number by 4.
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181 */
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182
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183 if (s % 4) {
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184 ngx_log_error(NGX_LOG_EMERG, ev->log, 0,
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10
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185 "accept() on %V returned socket #%d, "
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0
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186 "not divisible by 4",
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10
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187 &ls->listening->addr_text, s);
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0
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188 exit(1);
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189 }
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190
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191 c = &ngx_cycle->connections[s / 4];
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192 rev = &ngx_cycle->read_events[s / 4];
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193 wev = &ngx_cycle->write_events[s / 4];
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194 #else
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195 c = &ngx_cycle->connections[s];
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196 rev = &ngx_cycle->read_events[s];
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197 wev = &ngx_cycle->write_events[s];
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198 #endif
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199
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200 instance = rev->instance;
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201
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202 #if (NGX_THREADS)
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203
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204 if (*(&c->lock)) {
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205 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, ev->log, 0,
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52
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206 "spinlock in accept, fd:%d", s);
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0
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207 ngx_spinlock(&c->lock, 1000);
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208 ngx_unlock(&c->lock);
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209 }
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210
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211 #endif
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212
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213 ngx_memzero(rev, sizeof(ngx_event_t));
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214 ngx_memzero(wev, sizeof(ngx_event_t));
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215 ngx_memzero(c, sizeof(ngx_connection_t));
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216
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217 c->pool = pool;
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218
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219 c->listening = ls->listening;
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220 c->sockaddr = sa;
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221 c->socklen = len;
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222
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223 rev->instance = !instance;
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224 wev->instance = !instance;
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225
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226 rev->index = NGX_INVALID_INDEX;
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227 wev->index = NGX_INVALID_INDEX;
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228
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229 rev->data = c;
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230 wev->data = c;
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231
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232 c->read = rev;
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233 c->write = wev;
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234
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235 c->fd = s;
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236 c->unexpected_eof = 1;
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237
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238 wev->write = 1;
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239 wev->ready = 1;
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240
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241 if (ngx_event_flags & (NGX_USE_AIO_EVENT|NGX_USE_RTSIG_EVENT)) {
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42
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242 /* rtsig, aio, iocp */
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0
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243 rev->ready = 1;
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244 }
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245
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246 if (ev->deferred_accept) {
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247 rev->ready = 1;
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248 }
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249
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250 c->ctx = ls->ctx;
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251 c->servers = ls->servers;
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252
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253 c->recv = ngx_recv;
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254 c->send_chain = ngx_send_chain;
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255
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256 c->log = log;
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257 rev->log = log;
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258 wev->log = log;
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259
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260 /*
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261 * TODO: MT: - atomic increment (x86: lock xadd)
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262 * or protection by critical section or light mutex
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263 *
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264 * TODO: MP: - allocated in a shared memory
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265 * - atomic increment (x86: lock xadd)
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266 * or protection by critical section or light mutex
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267 */
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268
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269 c->number = ngx_atomic_inc(ngx_connection_counter);
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270
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44
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271 #if (NGX_STAT_STUB)
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272 ngx_atomic_inc(ngx_stat_handled);
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273 #endif
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274
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0
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275 #if (NGX_THREADS)
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276 rev->lock = &c->lock;
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277 wev->lock = &c->lock;
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278 rev->own_lock = &c->lock;
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279 wev->own_lock = &c->lock;
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280 #endif
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281
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282 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, ev->log, 0,
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283 "accept: fd:%d c:%d", s, c->number);
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284
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285 if (c->listening->addr_ntop) {
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286 c->addr_text.data = ngx_palloc(c->pool,
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287 c->listening->addr_text_max_len);
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288 if (c->addr_text.data == NULL) {
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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 c->addr_text.len = ngx_sock_ntop(c->listening->family, c->sockaddr,
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295 c->addr_text.data,
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296 c->listening->addr_text_max_len);
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297 if (c->addr_text.len == 0) {
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298 ngx_close_accepted_socket(s, log);
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299 ngx_destroy_pool(pool);
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300 return;
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301 }
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302 }
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303
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304 #if (NGX_DEBUG)
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305 {
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306
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307 uint32_t *addr;
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308 in_addr_t i;
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28
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309 struct sockaddr_in *sin;
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0
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310
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28
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311 sin = (struct sockaddr_in *) sa;
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0
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312 addr = ecf->debug_connection.elts;
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313 for (i = 0; i < ecf->debug_connection.nelts; i++) {
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28
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314 if (addr[i] == sin->sin_addr.s_addr) {
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0
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315 log->log_level = NGX_LOG_DEBUG_CONNECTION|NGX_LOG_DEBUG_ALL;
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316 break;
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317 }
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318 }
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319
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320 }
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321 #endif
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322
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323 if (ngx_add_conn && (ngx_event_flags & NGX_USE_EPOLL_EVENT) == 0) {
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324 if (ngx_add_conn(c) == NGX_ERROR) {
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325 ngx_close_accepted_socket(s, log);
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326 ngx_destroy_pool(pool);
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327 return;
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328 }
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329 }
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330
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331 pool = NULL;
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332
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333 log->data = NULL;
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334 log->handler = NULL;
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335
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336 ls->listening->handler(c);
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337
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4
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338 if (ngx_event_flags & NGX_USE_KQUEUE_EVENT) {
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0
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339 ev->available--;
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340 }
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341
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50
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342 #if 0
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0
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343 accepted++;
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50
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344 #endif
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0
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345
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346 } while (ev->available);
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347 }
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348
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349
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42
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350 ngx_int_t
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351 ngx_trylock_accept_mutex(ngx_cycle_t *cycle)
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0
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352 {
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353 if (*ngx_accept_mutex == 0
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354 && ngx_atomic_cmp_set(ngx_accept_mutex, 0, ngx_pid))
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355 {
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356 ngx_log_debug0(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
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357 "accept mutex locked");
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358
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359 if (!ngx_accept_mutex_held) {
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360 if (ngx_enable_accept_events(cycle) == NGX_ERROR) {
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361 *ngx_accept_mutex = 0;
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362 return NGX_ERROR;
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363 }
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364
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365 ngx_accept_mutex_held = 1;
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366 }
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367
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368 return NGX_OK;
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369 }
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370
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371 if (ngx_accept_mutex_held) {
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372 if (ngx_disable_accept_events(cycle) == NGX_ERROR) {
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373 return NGX_ERROR;
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374 }
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375
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376 ngx_accept_mutex_held = 0;
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377 }
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378
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379 return NGX_OK;
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380 }
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381
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382
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42
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383 ngx_int_t
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384 ngx_enable_accept_events(ngx_cycle_t *cycle)
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0
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385 {
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386 ngx_uint_t i;
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387 ngx_listening_t *s;
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388
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389 s = cycle->listening.elts;
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390 for (i = 0; i < cycle->listening.nelts; i++) {
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391
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392 /*
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393 * we do not need to handle the Winsock sockets here (divide a socket
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394 * number by 4) because this function would never called
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395 * in the Winsock environment
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396 */
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397
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398 if (ngx_event_flags & NGX_USE_RTSIG_EVENT) {
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399 if (ngx_add_conn(&cycle->connections[s[i].fd]) == NGX_ERROR) {
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400 return NGX_ERROR;
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401 }
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402
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403 } else {
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404 if (ngx_add_event(&cycle->read_events[s[i].fd], NGX_READ_EVENT, 0)
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405 == NGX_ERROR)
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406 {
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407 return NGX_ERROR;
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408 }
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409 }
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410 }
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411
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412 return NGX_OK;
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413 }
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414
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415
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42
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416 ngx_int_t
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417 ngx_disable_accept_events(ngx_cycle_t *cycle)
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0
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418 {
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419 ngx_uint_t i;
|
|
|
420 ngx_listening_t *s;
|
|
|
421
|
|
|
422 s = cycle->listening.elts;
|
|
|
423 for (i = 0; i < cycle->listening.nelts; i++) {
|
|
|
424
|
|
|
425 /*
|
|
|
426 * we do not need to handle the Winsock sockets here (divide a socket
|
|
|
427 * number by 4) because this function would never called
|
|
|
428 * in the Winsock environment
|
|
|
429 */
|
|
|
430
|
|
|
431 if (ngx_event_flags & NGX_USE_RTSIG_EVENT) {
|
|
|
432 if (!cycle->connections[s[i].fd].read->active) {
|
|
|
433 continue;
|
|
|
434 }
|
|
|
435
|
|
|
436 if (ngx_del_conn(&cycle->connections[s[i].fd], NGX_DISABLE_EVENT)
|
|
|
437 == NGX_ERROR)
|
|
|
438 {
|
|
|
439 return NGX_ERROR;
|
|
|
440 }
|
|
|
441
|
|
|
442 } else {
|
|
|
443 if (!cycle->read_events[s[i].fd].active) {
|
|
|
444 continue;
|
|
|
445 }
|
|
|
446
|
|
|
447 if (ngx_del_event(&cycle->read_events[s[i].fd], NGX_READ_EVENT,
|
|
|
448 NGX_DISABLE_EVENT) == NGX_ERROR)
|
|
|
449 {
|
|
|
450 return NGX_ERROR;
|
|
|
451 }
|
|
|
452 }
|
|
|
453 }
|
|
|
454
|
|
|
455 return NGX_OK;
|
|
|
456 }
|
|
|
457
|
|
|
458
|
|
42
|
459 static void
|
|
|
460 ngx_close_accepted_socket(ngx_socket_t s, ngx_log_t *log)
|
|
0
|
461 {
|
|
|
462 if (ngx_close_socket(s) == -1) {
|
|
|
463 ngx_log_error(NGX_LOG_ALERT, log, ngx_socket_errno,
|
|
|
464 ngx_close_socket_n " failed");
|
|
|
465 }
|
|
44
|
466
|
|
|
467 #if (NGX_STAT_STUB)
|
|
|
468 ngx_atomic_dec(ngx_stat_active);
|
|
|
469 #endif
|
|
0
|
470 }
|
|
|
471
|
|
|
472
|
|
42
|
473 static u_char *
|
|
|
474 ngx_accept_log_error(ngx_log_t *log, u_char *buf, size_t len)
|
|
0
|
475 {
|
|
32
|
476 return ngx_snprintf(buf, len, " while accept() on %V", log->data);
|
|
0
|
477 }
|
