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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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110
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159 rev = c->read;
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160 wev = c->write;
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0
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161
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162 wev->ready = 1;
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163
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164 if (ngx_event_flags & (NGX_USE_AIO_EVENT|NGX_USE_RTSIG_EVENT)) {
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42
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165 /* rtsig, aio, iocp */
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0
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166 rev->ready = 1;
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167 }
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168
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169 if (ev->deferred_accept) {
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170 rev->ready = 1;
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72
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171 #if (NGX_HAVE_KQUEUE)
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172 rev->available = 1;
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173 #endif
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0
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174 }
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175
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176 rev->log = log;
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177 wev->log = log;
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178
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179 /*
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110
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180 * TODO: MT: - ngx_atomic_fetch_add()
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0
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181 * or protection by critical section or light mutex
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182 *
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183 * TODO: MP: - allocated in a shared memory
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110
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184 * - ngx_atomic_fetch_add()
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0
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185 * or protection by critical section or light mutex
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186 */
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187
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110
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188 c->number = ngx_atomic_fetch_add(ngx_connection_counter, 1);
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0
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189
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44
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190 #if (NGX_STAT_STUB)
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110
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191 ngx_atomic_fetch_add(ngx_stat_handled, 1);
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44
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192 #endif
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193
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0
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194 #if (NGX_THREADS)
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195 rev->lock = &c->lock;
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196 wev->lock = &c->lock;
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197 rev->own_lock = &c->lock;
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198 wev->own_lock = &c->lock;
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199 #endif
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200
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92
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201 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, log, 0,
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0
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202 "accept: fd:%d c:%d", s, c->number);
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203
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92
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204 if (ls->addr_ntop) {
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205 c->addr_text.data = ngx_palloc(c->pool, ls->addr_text_max_len);
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0
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206 if (c->addr_text.data == NULL) {
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92
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207 ngx_close_accepted_connection(c);
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0
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208 return;
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209 }
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126
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210
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92
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211 c->addr_text.len = ngx_sock_ntop(ls->family, c->sockaddr,
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0
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212 c->addr_text.data,
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92
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213 ls->addr_text_max_len);
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0
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214 if (c->addr_text.len == 0) {
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92
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215 ngx_close_accepted_connection(c);
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0
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216 return;
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217 }
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218 }
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219
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220 #if (NGX_DEBUG)
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221 {
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222
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223 uint32_t *addr;
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224 in_addr_t i;
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28
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225 struct sockaddr_in *sin;
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0
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226
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28
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227 sin = (struct sockaddr_in *) sa;
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0
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228 addr = ecf->debug_connection.elts;
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229 for (i = 0; i < ecf->debug_connection.nelts; i++) {
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28
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230 if (addr[i] == sin->sin_addr.s_addr) {
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0
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231 log->log_level = NGX_LOG_DEBUG_CONNECTION|NGX_LOG_DEBUG_ALL;
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232 break;
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233 }
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234 }
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235
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236 }
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237 #endif
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238
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239 if (ngx_add_conn && (ngx_event_flags & NGX_USE_EPOLL_EVENT) == 0) {
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240 if (ngx_add_conn(c) == NGX_ERROR) {
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92
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241 ngx_close_accepted_connection(c);
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0
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242 return;
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243 }
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244 }
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245
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246 log->data = NULL;
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247 log->handler = NULL;
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248
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92
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249 ls->handler(c);
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0
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250
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4
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251 if (ngx_event_flags & NGX_USE_KQUEUE_EVENT) {
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0
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252 ev->available--;
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253 }
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254
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255 } while (ev->available);
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256 }
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257
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258
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42
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259 ngx_int_t
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260 ngx_trylock_accept_mutex(ngx_cycle_t *cycle)
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0
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261 {
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160
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262 if (ngx_shmtx_trylock(&ngx_accept_mutex)) {
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263
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0
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264 ngx_log_debug0(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
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265 "accept mutex locked");
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266
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164
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267 if (ngx_accept_mutex_held && !(ngx_event_flags & NGX_USE_RTSIG_EVENT)) {
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122
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268 return NGX_OK;
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269 }
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0
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270
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122
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271 if (ngx_enable_accept_events(cycle) == NGX_ERROR) {
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160
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272 ngx_shmtx_unlock(&ngx_accept_mutex);
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122
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273 return NGX_ERROR;
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0
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274 }
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275
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122
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276 ngx_accept_mutex_held = 1;
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277
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0
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278 return NGX_OK;
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279 }
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280
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281 if (ngx_accept_mutex_held) {
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282 if (ngx_disable_accept_events(cycle) == NGX_ERROR) {
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283 return NGX_ERROR;
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284 }
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285
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286 ngx_accept_mutex_held = 0;
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287 }
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288
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289 return NGX_OK;
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290 }
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291
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292
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122
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293 static ngx_int_t
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42
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294 ngx_enable_accept_events(ngx_cycle_t *cycle)
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0
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295 {
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92
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296 ngx_uint_t i;
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297 ngx_listening_t *ls;
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298 ngx_connection_t *c;
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0
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299
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92
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300 ls = cycle->listening.elts;
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0
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301 for (i = 0; i < cycle->listening.nelts; i++) {
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302
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92
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303 c = ls[i].connection;
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0
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304
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305 if (ngx_event_flags & NGX_USE_RTSIG_EVENT) {
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122
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306
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92
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307 if (ngx_add_conn(c) == NGX_ERROR) {
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0
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308 return NGX_ERROR;
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309 }
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310
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311 } else {
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92
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312 if (ngx_add_event(c->read, NGX_READ_EVENT, 0) == NGX_ERROR) {
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0
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313 return NGX_ERROR;
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314 }
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315 }
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316 }
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317
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318 return NGX_OK;
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319 }
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320
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321
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122
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322 static ngx_int_t
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42
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323 ngx_disable_accept_events(ngx_cycle_t *cycle)
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0
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324 {
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92
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325 ngx_uint_t i;
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326 ngx_listening_t *ls;
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327 ngx_connection_t *c;
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0
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328
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92
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329 ls = cycle->listening.elts;
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0
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330 for (i = 0; i < cycle->listening.nelts; i++) {
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331
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92
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332 c = ls[i].connection;
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333
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334 if (!c->read->active) {
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335 continue;
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336 }
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0
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337
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338 if (ngx_event_flags & NGX_USE_RTSIG_EVENT) {
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92
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339 if (ngx_del_conn(c, NGX_DISABLE_EVENT) == NGX_ERROR) {
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0
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340 return NGX_ERROR;
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341 }
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342
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343 } else {
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92
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344 if (ngx_del_event(c->read, NGX_READ_EVENT, NGX_DISABLE_EVENT)
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345 == NGX_ERROR)
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0
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346 {
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347 return NGX_ERROR;
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348 }
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349 }
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350 }
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351
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352 return NGX_OK;
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353 }
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354
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355
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42
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356 static void
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92
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357 ngx_close_accepted_connection(ngx_connection_t *c)
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0
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358 {
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92
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359 ngx_socket_t fd;
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360
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361 ngx_free_connection(c);
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362
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363 fd = c->fd;
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364 c->fd = (ngx_socket_t) -1;
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365
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366 if (ngx_close_socket(fd) == -1) {
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367 ngx_log_error(NGX_LOG_ALERT, c->log, ngx_socket_errno,
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0
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368 ngx_close_socket_n " failed");
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369 }
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44
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370
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92
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371 if (c->pool) {
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372 ngx_destroy_pool(c->pool);
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373 }
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374
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44
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375 #if (NGX_STAT_STUB)
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110
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376 ngx_atomic_fetch_add(ngx_stat_active, -1);
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44
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377 #endif
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0
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378 }
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379
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380
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92
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381 u_char *
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42
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382 ngx_accept_log_error(ngx_log_t *log, u_char *buf, size_t len)
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0
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383 {
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92
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384 return ngx_snprintf(buf, len, " while accepting new connection on %V",
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385 log->data);
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0
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386 }
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