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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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92
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12 /* the buffer size is enough to hold "struct sockaddr_un" */
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13 #define NGX_SOCKLEN 512
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14
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15
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16 static void ngx_close_accepted_connection(ngx_connection_t *c);
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0
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17
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18
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42
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19 void
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20 ngx_event_accept(ngx_event_t *ev)
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0
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21 {
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92
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22 socklen_t sl;
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32
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23 ngx_err_t err;
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24 ngx_log_t *log;
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92
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25 ngx_uint_t instance;
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32
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26 ngx_socket_t s;
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27 ngx_event_t *rev, *wev;
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92
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28 ngx_listening_t *ls;
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29 ngx_connection_t *c, *lc;
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32
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30 ngx_event_conf_t *ecf;
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92
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31 char sa[NGX_SOCKLEN];
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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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92
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42 lc = ev->data;
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43 ls = lc->listening;
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44 ev->ready = 0;
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0
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45
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46 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, ev->log, 0,
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92
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47 "accept on %V, ready: %d", &ls->addr_text, ev->available);
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0
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48
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49 do {
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92
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50 sl = NGX_SOCKLEN;
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0
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51
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92
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52 s = accept(lc->fd, (struct sockaddr *) sa, &sl);
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26
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53
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0
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54 if (s == -1) {
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55 err = ngx_socket_errno;
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56
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57 if (err == NGX_EAGAIN) {
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58 return;
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59 }
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60
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58
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61 ngx_log_error((err == NGX_ECONNABORTED) ? NGX_LOG_CRIT:
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62 NGX_LOG_ALERT,
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92
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63 ev->log, err, "accept() failed");
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0
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64
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65 if (err == NGX_ECONNABORTED) {
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4
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66 if (ngx_event_flags & NGX_USE_KQUEUE_EVENT) {
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0
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67 ev->available--;
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68 }
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69
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70 if (ev->available) {
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71 continue;
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72 }
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73 }
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74
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75 return;
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76 }
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77
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78 #if (NGX_STAT_STUB)
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42
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79 ngx_atomic_inc(ngx_stat_accepted);
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44
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80 ngx_atomic_inc(ngx_stat_active);
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0
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81 #endif
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82
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92
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83 ngx_accept_disabled = NGX_ACCEPT_THRESHOLD
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84 - ngx_cycle->free_connection_n;
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85
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86 c = ngx_get_connection(s, ev->log);
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0
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87
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92
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88 if (c == NULL) {
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89 if (ngx_close_socket(s) == -1) {
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90 ngx_log_error(NGX_LOG_ALERT, ev->log, ngx_socket_errno,
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91 ngx_close_socket_n " failed");
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92 }
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0
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93
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92
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94 return;
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95 }
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96
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97 rev = c->read;
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98 wev = c->write;
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99
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100 ngx_memzero(c, sizeof(ngx_connection_t));
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0
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101
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92
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102 c->read = rev;
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103 c->write = wev;
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104 c->fd = s;
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105 c->log = ev->log;
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106
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107 c->pool = ngx_create_pool(ls->pool_size, ev->log);
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108 if (c->pool == NULL) {
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109 ngx_close_accepted_connection(c);
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110 return;
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111 }
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0
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112
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92
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113 c->sockaddr = ngx_palloc(c->pool, sl);
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114 if (c->sockaddr == NULL) {
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115 ngx_close_accepted_connection(c);
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116 return;
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117 }
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118
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119 ngx_memcpy(c->sockaddr, sa, sl);
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120
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121 log = ngx_palloc(c->pool, sizeof(ngx_log_t));
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122 if (log == NULL) {
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123 ngx_close_accepted_connection(c);
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0
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124 return;
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125 }
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126
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36
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127 /* set a blocking mode for aio and non-blocking mode for others */
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0
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128
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129 if (ngx_inherited_nonblocking) {
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92
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130 if (ngx_event_flags & NGX_USE_AIO_EVENT) {
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0
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131 if (ngx_blocking(s) == -1) {
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92
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132 ngx_log_error(NGX_LOG_ALERT, ev->log, ngx_socket_errno,
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0
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133 ngx_blocking_n " failed");
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92
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134 ngx_close_accepted_connection(c);
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0
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135 return;
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136 }
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137 }
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138
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139 } else {
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140 if (!(ngx_event_flags & (NGX_USE_AIO_EVENT|NGX_USE_RTSIG_EVENT))) {
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141 if (ngx_nonblocking(s) == -1) {
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92
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142 ngx_log_error(NGX_LOG_ALERT, ev->log, ngx_socket_errno,
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0
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143 ngx_nonblocking_n " failed");
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92
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144 ngx_close_accepted_connection(c);
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0
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145 return;
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146 }
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147 }
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148 }
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149
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92
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150 *log = ls->log;
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151
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152 c->recv = ngx_recv;
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153 c->send = ngx_send;
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154 c->send_chain = ngx_send_chain;
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0
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155
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92
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156 c->log = log;
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157 c->pool->log = log;
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0
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158
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92
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159 c->listening = ls;
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160 c->socklen = sl;
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161
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162 c->unexpected_eof = 1;
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163
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164 c->ctx = lc->ctx;
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165 c->servers = lc->servers;
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0
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166
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167 instance = rev->instance;
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168
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169 ngx_memzero(rev, sizeof(ngx_event_t));
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170 ngx_memzero(wev, sizeof(ngx_event_t));
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171
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172 rev->instance = !instance;
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173 wev->instance = !instance;
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174
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175 rev->index = NGX_INVALID_INDEX;
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176 wev->index = NGX_INVALID_INDEX;
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177
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178 rev->data = c;
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179 wev->data = c;
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180
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181 wev->write = 1;
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182 wev->ready = 1;
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183
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184 if (ngx_event_flags & (NGX_USE_AIO_EVENT|NGX_USE_RTSIG_EVENT)) {
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42
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185 /* rtsig, aio, iocp */
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0
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186 rev->ready = 1;
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187 }
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188
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189 if (ev->deferred_accept) {
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190 rev->ready = 1;
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72
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191 #if (NGX_HAVE_KQUEUE)
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192 rev->available = 1;
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193 #endif
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0
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194 }
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195
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196 rev->log = log;
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197 wev->log = log;
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198
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199 /*
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200 * TODO: MT: - atomic increment (x86: lock xadd)
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201 * or protection by critical section or light mutex
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202 *
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203 * TODO: MP: - allocated in a shared memory
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204 * - atomic increment (x86: lock xadd)
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205 * or protection by critical section or light mutex
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206 */
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207
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208 c->number = ngx_atomic_inc(ngx_connection_counter);
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209
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44
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210 #if (NGX_STAT_STUB)
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211 ngx_atomic_inc(ngx_stat_handled);
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212 #endif
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213
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0
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214 #if (NGX_THREADS)
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215 rev->lock = &c->lock;
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216 wev->lock = &c->lock;
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217 rev->own_lock = &c->lock;
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218 wev->own_lock = &c->lock;
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219 #endif
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220
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92
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221 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, log, 0,
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0
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222 "accept: fd:%d c:%d", s, c->number);
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223
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92
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224 if (ls->addr_ntop) {
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225 c->addr_text.data = ngx_palloc(c->pool, ls->addr_text_max_len);
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0
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226 if (c->addr_text.data == NULL) {
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92
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227 ngx_close_accepted_connection(c);
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0
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228 return;
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229 }
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230
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92
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231 c->addr_text.len = ngx_sock_ntop(ls->family, c->sockaddr,
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0
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232 c->addr_text.data,
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92
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233 ls->addr_text_max_len);
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0
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234 if (c->addr_text.len == 0) {
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92
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235 ngx_close_accepted_connection(c);
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0
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236 return;
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237 }
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238 }
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239
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240 #if (NGX_DEBUG)
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241 {
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242
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243 uint32_t *addr;
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244 in_addr_t i;
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28
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245 struct sockaddr_in *sin;
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0
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246
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28
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247 sin = (struct sockaddr_in *) sa;
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0
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248 addr = ecf->debug_connection.elts;
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249 for (i = 0; i < ecf->debug_connection.nelts; i++) {
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28
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250 if (addr[i] == sin->sin_addr.s_addr) {
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0
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251 log->log_level = NGX_LOG_DEBUG_CONNECTION|NGX_LOG_DEBUG_ALL;
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252 break;
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253 }
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254 }
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255
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256 }
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257 #endif
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258
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259 if (ngx_add_conn && (ngx_event_flags & NGX_USE_EPOLL_EVENT) == 0) {
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260 if (ngx_add_conn(c) == NGX_ERROR) {
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92
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261 ngx_close_accepted_connection(c);
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0
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262 return;
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263 }
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264 }
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265
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266 log->data = NULL;
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267 log->handler = NULL;
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268
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92
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269 ls->handler(c);
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0
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270
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4
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271 if (ngx_event_flags & NGX_USE_KQUEUE_EVENT) {
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0
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272 ev->available--;
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273 }
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274
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275 } while (ev->available);
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276 }
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277
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278
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42
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279 ngx_int_t
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280 ngx_trylock_accept_mutex(ngx_cycle_t *cycle)
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0
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281 {
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282 if (*ngx_accept_mutex == 0
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283 && ngx_atomic_cmp_set(ngx_accept_mutex, 0, ngx_pid))
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284 {
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285 ngx_log_debug0(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
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286 "accept mutex locked");
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287
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288 if (!ngx_accept_mutex_held) {
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289 if (ngx_enable_accept_events(cycle) == NGX_ERROR) {
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290 *ngx_accept_mutex = 0;
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291 return NGX_ERROR;
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292 }
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293
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294 ngx_accept_mutex_held = 1;
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295 }
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296
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297 return NGX_OK;
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298 }
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299
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300 if (ngx_accept_mutex_held) {
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301 if (ngx_disable_accept_events(cycle) == NGX_ERROR) {
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302 return NGX_ERROR;
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303 }
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304
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305 ngx_accept_mutex_held = 0;
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306 }
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307
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308 return NGX_OK;
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309 }
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310
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311
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42
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312 ngx_int_t
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313 ngx_enable_accept_events(ngx_cycle_t *cycle)
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0
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314 {
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92
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315 ngx_uint_t i;
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316 ngx_listening_t *ls;
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317 ngx_connection_t *c;
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0
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318
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92
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319 ls = cycle->listening.elts;
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0
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320 for (i = 0; i < cycle->listening.nelts; i++) {
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321
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92
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322 c = ls[i].connection;
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0
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323
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324 if (ngx_event_flags & NGX_USE_RTSIG_EVENT) {
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92
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325 if (ngx_add_conn(c) == NGX_ERROR) {
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0
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326 return NGX_ERROR;
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327 }
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328
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329 } else {
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92
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330 if (ngx_add_event(c->read, NGX_READ_EVENT, 0) == NGX_ERROR) {
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0
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331 return NGX_ERROR;
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332 }
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333 }
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334 }
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335
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336 return NGX_OK;
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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_disable_accept_events(ngx_cycle_t *cycle)
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0
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342 {
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92
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343 ngx_uint_t i;
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344 ngx_listening_t *ls;
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345 ngx_connection_t *c;
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0
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346
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92
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347 ls = cycle->listening.elts;
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0
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348 for (i = 0; i < cycle->listening.nelts; i++) {
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349
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92
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350 c = ls[i].connection;
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351
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352 if (!c->read->active) {
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353 continue;
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354 }
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0
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355
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356 if (ngx_event_flags & NGX_USE_RTSIG_EVENT) {
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92
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357 if (ngx_del_conn(c, NGX_DISABLE_EVENT) == NGX_ERROR) {
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0
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358 return NGX_ERROR;
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359 }
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360
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361 } else {
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92
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362 if (ngx_del_event(c->read, NGX_READ_EVENT, NGX_DISABLE_EVENT)
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363 == NGX_ERROR)
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0
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364 {
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365 return NGX_ERROR;
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366 }
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367 }
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368 }
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369
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370 return NGX_OK;
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371 }
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372
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373
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42
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374 static void
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92
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375 ngx_close_accepted_connection(ngx_connection_t *c)
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0
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376 {
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92
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377 ngx_socket_t fd;
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378
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379 ngx_free_connection(c);
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380
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381 fd = c->fd;
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382 c->fd = (ngx_socket_t) -1;
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383
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384 if (ngx_close_socket(fd) == -1) {
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385 ngx_log_error(NGX_LOG_ALERT, c->log, ngx_socket_errno,
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0
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386 ngx_close_socket_n " failed");
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387 }
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44
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388
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92
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389 if (c->pool) {
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390 ngx_destroy_pool(c->pool);
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391 }
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392
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44
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393 #if (NGX_STAT_STUB)
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394 ngx_atomic_dec(ngx_stat_active);
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395 #endif
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0
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396 }
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397
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398
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92
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399 u_char *
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42
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400 ngx_accept_log_error(ngx_log_t *log, u_char *buf, size_t len)
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0
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401 {
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92
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402 return ngx_snprintf(buf, len, " while accepting new connection on %V",
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403 log->data);
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0
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404 }
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