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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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122
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16 static ngx_int_t ngx_enable_accept_events(ngx_cycle_t *cycle);
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17 static ngx_int_t ngx_disable_accept_events(ngx_cycle_t *cycle);
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92
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18 static void ngx_close_accepted_connection(ngx_connection_t *c);
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0
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19
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20
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42
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21 void
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22 ngx_event_accept(ngx_event_t *ev)
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0
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23 {
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92
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24 socklen_t sl;
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32
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25 ngx_err_t err;
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26 ngx_log_t *log;
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27 ngx_socket_t s;
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28 ngx_event_t *rev, *wev;
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92
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29 ngx_listening_t *ls;
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30 ngx_connection_t *c, *lc;
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32
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31 ngx_event_conf_t *ecf;
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92
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32 char sa[NGX_SOCKLEN];
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0
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33
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34 ecf = ngx_event_get_conf(ngx_cycle->conf_ctx, ngx_event_core_module);
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35
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36 if (ngx_event_flags & NGX_USE_RTSIG_EVENT) {
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37 ev->available = 1;
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38
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4
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39 } else if (!(ngx_event_flags & NGX_USE_KQUEUE_EVENT)) {
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0
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40 ev->available = ecf->multi_accept;
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41 }
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42
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92
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43 lc = ev->data;
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44 ls = lc->listening;
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45 ev->ready = 0;
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0
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46
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47 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, ev->log, 0,
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92
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48 "accept on %V, ready: %d", &ls->addr_text, ev->available);
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0
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49
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50 do {
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92
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51 sl = NGX_SOCKLEN;
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0
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52
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92
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53 s = accept(lc->fd, (struct sockaddr *) sa, &sl);
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26
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54
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0
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55 if (s == -1) {
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56 err = ngx_socket_errno;
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57
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58 if (err == NGX_EAGAIN) {
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59 return;
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60 }
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61
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166
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62 ngx_log_error((err == NGX_ECONNABORTED) ? NGX_LOG_ERR:
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58
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63 NGX_LOG_ALERT,
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92
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64 ev->log, err, "accept() failed");
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0
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65
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66 if (err == NGX_ECONNABORTED) {
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4
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67 if (ngx_event_flags & NGX_USE_KQUEUE_EVENT) {
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0
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68 ev->available--;
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69 }
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70
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71 if (ev->available) {
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72 continue;
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73 }
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74 }
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75
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76 return;
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77 }
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78
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79 #if (NGX_STAT_STUB)
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110
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80 ngx_atomic_fetch_add(ngx_stat_accepted, 1);
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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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184
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97 #if (NGX_STAT_STUB)
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98 ngx_atomic_fetch_add(ngx_stat_active, 1);
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99 #endif
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100
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92
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101 c->pool = ngx_create_pool(ls->pool_size, ev->log);
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102 if (c->pool == NULL) {
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103 ngx_close_accepted_connection(c);
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104 return;
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105 }
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0
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106
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92
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107 c->sockaddr = ngx_palloc(c->pool, sl);
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108 if (c->sockaddr == 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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112
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113 ngx_memcpy(c->sockaddr, sa, sl);
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114
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115 log = ngx_palloc(c->pool, sizeof(ngx_log_t));
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116 if (log == NULL) {
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117 ngx_close_accepted_connection(c);
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0
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118 return;
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119 }
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120
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36
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121 /* set a blocking mode for aio and non-blocking mode for others */
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0
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122
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123 if (ngx_inherited_nonblocking) {
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92
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124 if (ngx_event_flags & NGX_USE_AIO_EVENT) {
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0
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125 if (ngx_blocking(s) == -1) {
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92
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126 ngx_log_error(NGX_LOG_ALERT, ev->log, ngx_socket_errno,
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0
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127 ngx_blocking_n " failed");
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92
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128 ngx_close_accepted_connection(c);
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0
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129 return;
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130 }
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131 }
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132
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133 } else {
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134 if (!(ngx_event_flags & (NGX_USE_AIO_EVENT|NGX_USE_RTSIG_EVENT))) {
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135 if (ngx_nonblocking(s) == -1) {
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92
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136 ngx_log_error(NGX_LOG_ALERT, ev->log, ngx_socket_errno,
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0
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137 ngx_nonblocking_n " failed");
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92
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138 ngx_close_accepted_connection(c);
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0
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139 return;
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140 }
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141 }
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142 }
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143
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92
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144 *log = ls->log;
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145
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146 c->recv = ngx_recv;
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147 c->send = ngx_send;
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126
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148 c->recv_chain = ngx_recv_chain;
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92
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149 c->send_chain = ngx_send_chain;
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0
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150
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92
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151 c->log = log;
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152 c->pool->log = log;
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0
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153
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92
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154 c->listening = ls;
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155 c->socklen = sl;
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156
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157 c->unexpected_eof = 1;
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158
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159 c->ctx = lc->ctx;
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160 c->servers = lc->servers;
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0
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161
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110
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162 rev = c->read;
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163 wev = c->write;
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0
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164
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165 wev->ready = 1;
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166
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167 if (ngx_event_flags & (NGX_USE_AIO_EVENT|NGX_USE_RTSIG_EVENT)) {
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42
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168 /* rtsig, aio, iocp */
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0
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169 rev->ready = 1;
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170 }
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171
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172 if (ev->deferred_accept) {
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173 rev->ready = 1;
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72
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174 #if (NGX_HAVE_KQUEUE)
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175 rev->available = 1;
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176 #endif
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0
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177 }
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178
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179 rev->log = log;
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180 wev->log = log;
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181
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182 /*
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110
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183 * TODO: MT: - ngx_atomic_fetch_add()
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0
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184 * or protection by critical section or light mutex
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185 *
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186 * TODO: MP: - allocated in a shared memory
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110
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187 * - ngx_atomic_fetch_add()
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0
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188 * or protection by critical section or light mutex
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189 */
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190
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110
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191 c->number = ngx_atomic_fetch_add(ngx_connection_counter, 1);
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0
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192
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44
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193 #if (NGX_STAT_STUB)
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110
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194 ngx_atomic_fetch_add(ngx_stat_handled, 1);
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44
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195 #endif
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196
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0
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197 #if (NGX_THREADS)
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198 rev->lock = &c->lock;
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199 wev->lock = &c->lock;
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200 rev->own_lock = &c->lock;
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201 wev->own_lock = &c->lock;
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202 #endif
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203
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92
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204 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, log, 0,
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0
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205 "accept: fd:%d c:%d", s, c->number);
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206
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92
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207 if (ls->addr_ntop) {
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208 c->addr_text.data = ngx_palloc(c->pool, ls->addr_text_max_len);
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0
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209 if (c->addr_text.data == NULL) {
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92
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210 ngx_close_accepted_connection(c);
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0
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211 return;
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212 }
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126
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213
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92
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214 c->addr_text.len = ngx_sock_ntop(ls->family, c->sockaddr,
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0
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215 c->addr_text.data,
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92
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216 ls->addr_text_max_len);
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0
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217 if (c->addr_text.len == 0) {
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92
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218 ngx_close_accepted_connection(c);
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0
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219 return;
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220 }
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221 }
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222
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223 #if (NGX_DEBUG)
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224 {
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225
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226 uint32_t *addr;
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227 in_addr_t i;
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28
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228 struct sockaddr_in *sin;
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0
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229
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28
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230 sin = (struct sockaddr_in *) sa;
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0
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231 addr = ecf->debug_connection.elts;
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232 for (i = 0; i < ecf->debug_connection.nelts; i++) {
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28
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233 if (addr[i] == sin->sin_addr.s_addr) {
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0
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234 log->log_level = NGX_LOG_DEBUG_CONNECTION|NGX_LOG_DEBUG_ALL;
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235 break;
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236 }
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237 }
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238
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239 }
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240 #endif
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241
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242 if (ngx_add_conn && (ngx_event_flags & NGX_USE_EPOLL_EVENT) == 0) {
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243 if (ngx_add_conn(c) == NGX_ERROR) {
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92
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244 ngx_close_accepted_connection(c);
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0
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245 return;
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246 }
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247 }
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248
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249 log->data = NULL;
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250 log->handler = NULL;
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251
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92
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252 ls->handler(c);
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0
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253
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4
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254 if (ngx_event_flags & NGX_USE_KQUEUE_EVENT) {
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0
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255 ev->available--;
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256 }
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257
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258 } while (ev->available);
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259 }
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260
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261
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42
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262 ngx_int_t
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263 ngx_trylock_accept_mutex(ngx_cycle_t *cycle)
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0
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264 {
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160
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265 if (ngx_shmtx_trylock(&ngx_accept_mutex)) {
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266
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0
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267 ngx_log_debug0(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
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268 "accept mutex locked");
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269
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164
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270 if (ngx_accept_mutex_held && !(ngx_event_flags & NGX_USE_RTSIG_EVENT)) {
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122
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271 return NGX_OK;
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272 }
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0
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273
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122
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274 if (ngx_enable_accept_events(cycle) == NGX_ERROR) {
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160
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275 ngx_shmtx_unlock(&ngx_accept_mutex);
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122
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276 return NGX_ERROR;
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0
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277 }
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278
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122
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279 ngx_accept_mutex_held = 1;
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280
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0
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281 return NGX_OK;
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282 }
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283
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284 if (ngx_accept_mutex_held) {
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285 if (ngx_disable_accept_events(cycle) == NGX_ERROR) {
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286 return NGX_ERROR;
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287 }
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288
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289 ngx_accept_mutex_held = 0;
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290 }
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291
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292 return NGX_OK;
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293 }
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294
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295
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122
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296 static ngx_int_t
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42
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297 ngx_enable_accept_events(ngx_cycle_t *cycle)
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0
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298 {
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92
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299 ngx_uint_t i;
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300 ngx_listening_t *ls;
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301 ngx_connection_t *c;
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0
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302
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92
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303 ls = cycle->listening.elts;
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0
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304 for (i = 0; i < cycle->listening.nelts; i++) {
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305
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92
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306 c = ls[i].connection;
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0
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307
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308 if (ngx_event_flags & NGX_USE_RTSIG_EVENT) {
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122
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309
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92
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310 if (ngx_add_conn(c) == NGX_ERROR) {
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0
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311 return NGX_ERROR;
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312 }
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313
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314 } else {
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92
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315 if (ngx_add_event(c->read, NGX_READ_EVENT, 0) == NGX_ERROR) {
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0
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316 return NGX_ERROR;
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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 return NGX_OK;
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322 }
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323
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324
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122
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325 static ngx_int_t
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42
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326 ngx_disable_accept_events(ngx_cycle_t *cycle)
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0
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327 {
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92
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328 ngx_uint_t i;
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329 ngx_listening_t *ls;
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330 ngx_connection_t *c;
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0
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331
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92
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332 ls = cycle->listening.elts;
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0
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333 for (i = 0; i < cycle->listening.nelts; i++) {
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334
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92
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335 c = ls[i].connection;
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336
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337 if (!c->read->active) {
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338 continue;
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339 }
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0
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340
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341 if (ngx_event_flags & NGX_USE_RTSIG_EVENT) {
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92
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342 if (ngx_del_conn(c, NGX_DISABLE_EVENT) == NGX_ERROR) {
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0
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343 return NGX_ERROR;
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344 }
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345
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346 } else {
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92
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347 if (ngx_del_event(c->read, NGX_READ_EVENT, NGX_DISABLE_EVENT)
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348 == NGX_ERROR)
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0
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349 {
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350 return NGX_ERROR;
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351 }
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352 }
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353 }
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354
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355 return NGX_OK;
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356 }
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357
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358
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42
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359 static void
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92
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360 ngx_close_accepted_connection(ngx_connection_t *c)
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0
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361 {
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92
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362 ngx_socket_t fd;
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363
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364 ngx_free_connection(c);
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365
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366 fd = c->fd;
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367 c->fd = (ngx_socket_t) -1;
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368
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369 if (ngx_close_socket(fd) == -1) {
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370 ngx_log_error(NGX_LOG_ALERT, c->log, ngx_socket_errno,
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0
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371 ngx_close_socket_n " failed");
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372 }
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44
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373
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92
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374 if (c->pool) {
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375 ngx_destroy_pool(c->pool);
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376 }
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377
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44
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378 #if (NGX_STAT_STUB)
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110
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379 ngx_atomic_fetch_add(ngx_stat_active, -1);
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44
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380 #endif
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0
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381 }
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382
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383
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92
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384 u_char *
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42
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385 ngx_accept_log_error(ngx_log_t *log, u_char *buf, size_t len)
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0
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386 {
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92
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387 return ngx_snprintf(buf, len, " while accepting new connection on %V",
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388 log->data);
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0
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389 }
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