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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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122
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12 static ngx_int_t ngx_enable_accept_events(ngx_cycle_t *cycle);
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13 static ngx_int_t ngx_disable_accept_events(ngx_cycle_t *cycle);
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92
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14 static void ngx_close_accepted_connection(ngx_connection_t *c);
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0
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15
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16
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42
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17 void
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18 ngx_event_accept(ngx_event_t *ev)
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0
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19 {
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236
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20 socklen_t socklen;
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32
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21 ngx_err_t err;
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22 ngx_log_t *log;
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23 ngx_socket_t s;
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24 ngx_event_t *rev, *wev;
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92
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25 ngx_listening_t *ls;
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26 ngx_connection_t *c, *lc;
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32
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27 ngx_event_conf_t *ecf;
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448
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28 u_char sa[NGX_SOCKADDRLEN];
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0
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29
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30 ecf = ngx_event_get_conf(ngx_cycle->conf_ctx, ngx_event_core_module);
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31
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32 if (ngx_event_flags & NGX_USE_RTSIG_EVENT) {
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33 ev->available = 1;
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34
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4
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35 } else if (!(ngx_event_flags & NGX_USE_KQUEUE_EVENT)) {
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0
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36 ev->available = ecf->multi_accept;
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37 }
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38
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92
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39 lc = ev->data;
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40 ls = lc->listening;
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41 ev->ready = 0;
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0
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42
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43 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, ev->log, 0,
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92
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44 "accept on %V, ready: %d", &ls->addr_text, ev->available);
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0
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45
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46 do {
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448
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47 socklen = NGX_SOCKADDRLEN;
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0
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48
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236
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49 s = accept(lc->fd, (struct sockaddr *) sa, &socklen);
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26
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50
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0
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51 if (s == -1) {
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52 err = ngx_socket_errno;
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53
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54 if (err == NGX_EAGAIN) {
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236
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55 ngx_log_debug0(NGX_LOG_DEBUG_EVENT, ev->log, err,
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56 "accept() not ready");
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0
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57 return;
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58 }
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59
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166
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60 ngx_log_error((err == NGX_ECONNABORTED) ? NGX_LOG_ERR:
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58
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61 NGX_LOG_ALERT,
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92
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62 ev->log, err, "accept() failed");
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0
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63
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64 if (err == NGX_ECONNABORTED) {
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4
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65 if (ngx_event_flags & NGX_USE_KQUEUE_EVENT) {
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0
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66 ev->available--;
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67 }
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68
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69 if (ev->available) {
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70 continue;
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71 }
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72 }
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73
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74 return;
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75 }
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76
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77 #if (NGX_STAT_STUB)
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110
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78 ngx_atomic_fetch_add(ngx_stat_accepted, 1);
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0
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79 #endif
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80
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412
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81 ngx_accept_disabled = ngx_cycle->connection_n / 8
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92
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82 - ngx_cycle->free_connection_n;
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83
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84 c = ngx_get_connection(s, ev->log);
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0
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85
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92
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86 if (c == NULL) {
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87 if (ngx_close_socket(s) == -1) {
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88 ngx_log_error(NGX_LOG_ALERT, ev->log, ngx_socket_errno,
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89 ngx_close_socket_n " failed");
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90 }
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0
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91
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92
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92 return;
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93 }
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94
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184
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95 #if (NGX_STAT_STUB)
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96 ngx_atomic_fetch_add(ngx_stat_active, 1);
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97 #endif
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98
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92
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99 c->pool = ngx_create_pool(ls->pool_size, ev->log);
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100 if (c->pool == NULL) {
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101 ngx_close_accepted_connection(c);
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102 return;
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103 }
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0
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104
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236
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105 c->sockaddr = ngx_palloc(c->pool, socklen);
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92
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106 if (c->sockaddr == NULL) {
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107 ngx_close_accepted_connection(c);
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108 return;
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109 }
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110
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236
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111 ngx_memcpy(c->sockaddr, sa, socklen);
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92
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112
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113 log = ngx_palloc(c->pool, sizeof(ngx_log_t));
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114 if (log == NULL) {
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115 ngx_close_accepted_connection(c);
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0
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116 return;
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117 }
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118
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36
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119 /* set a blocking mode for aio and non-blocking mode for others */
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0
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120
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121 if (ngx_inherited_nonblocking) {
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92
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122 if (ngx_event_flags & NGX_USE_AIO_EVENT) {
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0
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123 if (ngx_blocking(s) == -1) {
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92
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124 ngx_log_error(NGX_LOG_ALERT, ev->log, ngx_socket_errno,
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0
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125 ngx_blocking_n " failed");
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92
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126 ngx_close_accepted_connection(c);
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0
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127 return;
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128 }
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129 }
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130
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131 } else {
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132 if (!(ngx_event_flags & (NGX_USE_AIO_EVENT|NGX_USE_RTSIG_EVENT))) {
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133 if (ngx_nonblocking(s) == -1) {
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92
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134 ngx_log_error(NGX_LOG_ALERT, ev->log, ngx_socket_errno,
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0
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135 ngx_nonblocking_n " failed");
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92
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136 ngx_close_accepted_connection(c);
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0
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137 return;
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138 }
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139 }
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140 }
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141
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92
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142 *log = ls->log;
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143
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144 c->recv = ngx_recv;
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145 c->send = ngx_send;
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126
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146 c->recv_chain = ngx_recv_chain;
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92
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147 c->send_chain = ngx_send_chain;
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0
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148
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92
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149 c->log = log;
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150 c->pool->log = log;
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0
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151
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448
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152 c->socklen = socklen;
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92
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153 c->listening = ls;
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448
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154 c->local_sockaddr = ls->sockaddr;
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155 c->local_socklen = ls->socklen;
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92
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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 if (ls->addr_ntop) {
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382
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202 c->addr_text.data = ngx_pnalloc(c->pool, ls->addr_text_max_len);
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0
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203 if (c->addr_text.data == NULL) {
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92
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204 ngx_close_accepted_connection(c);
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0
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205 return;
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206 }
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126
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207
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400
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208 c->addr_text.len = ngx_sock_ntop(c->sockaddr, c->addr_text.data,
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448
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209 ls->addr_text_max_len, 0);
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0
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210 if (c->addr_text.len == 0) {
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92
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211 ngx_close_accepted_connection(c);
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0
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212 return;
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213 }
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214 }
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215
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216 #if (NGX_DEBUG)
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217 {
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218
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219 in_addr_t i;
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214
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220 ngx_event_debug_t *dc;
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28
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221 struct sockaddr_in *sin;
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0
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222
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28
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223 sin = (struct sockaddr_in *) sa;
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214
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224 dc = ecf->debug_connection.elts;
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0
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225 for (i = 0; i < ecf->debug_connection.nelts; i++) {
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214
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226 if ((sin->sin_addr.s_addr & dc[i].mask) == dc[i].addr) {
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0
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227 log->log_level = NGX_LOG_DEBUG_CONNECTION|NGX_LOG_DEBUG_ALL;
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228 break;
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229 }
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230 }
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231
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232 }
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233 #endif
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234
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214
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235 ngx_log_debug3(NGX_LOG_DEBUG_EVENT, log, 0,
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236 "*%d accept: %V fd:%d", c->number, &c->addr_text, s);
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237
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0
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238 if (ngx_add_conn && (ngx_event_flags & NGX_USE_EPOLL_EVENT) == 0) {
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239 if (ngx_add_conn(c) == NGX_ERROR) {
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92
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240 ngx_close_accepted_connection(c);
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0
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241 return;
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242 }
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243 }
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244
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245 log->data = NULL;
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246 log->handler = NULL;
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247
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92
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248 ls->handler(c);
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0
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249
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4
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250 if (ngx_event_flags & NGX_USE_KQUEUE_EVENT) {
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0
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251 ev->available--;
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252 }
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253
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254 } while (ev->available);
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255 }
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256
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257
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42
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258 ngx_int_t
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259 ngx_trylock_accept_mutex(ngx_cycle_t *cycle)
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0
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260 {
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160
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261 if (ngx_shmtx_trylock(&ngx_accept_mutex)) {
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262
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0
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263 ngx_log_debug0(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
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264 "accept mutex locked");
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265
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236
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266 if (ngx_accept_mutex_held
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267 && ngx_accept_events == 0
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268 && !(ngx_event_flags & NGX_USE_RTSIG_EVENT))
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269 {
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122
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270 return NGX_OK;
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271 }
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0
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272
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122
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273 if (ngx_enable_accept_events(cycle) == NGX_ERROR) {
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160
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274 ngx_shmtx_unlock(&ngx_accept_mutex);
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122
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275 return NGX_ERROR;
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0
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276 }
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277
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236
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278 ngx_accept_events = 0;
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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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236
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284 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
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285 "accept mutex lock failed: %ui", ngx_accept_mutex_held);
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286
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0
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287 if (ngx_accept_mutex_held) {
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288 if (ngx_disable_accept_events(cycle) == NGX_ERROR) {
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289 return NGX_ERROR;
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290 }
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291
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292 ngx_accept_mutex_held = 0;
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293 }
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294
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295 return NGX_OK;
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296 }
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297
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298
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122
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299 static ngx_int_t
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42
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300 ngx_enable_accept_events(ngx_cycle_t *cycle)
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0
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301 {
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92
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302 ngx_uint_t i;
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303 ngx_listening_t *ls;
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304 ngx_connection_t *c;
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0
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305
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92
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306 ls = cycle->listening.elts;
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0
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307 for (i = 0; i < cycle->listening.nelts; i++) {
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308
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92
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309 c = ls[i].connection;
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0
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310
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311 if (ngx_event_flags & NGX_USE_RTSIG_EVENT) {
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122
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312
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92
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313 if (ngx_add_conn(c) == NGX_ERROR) {
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0
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314 return NGX_ERROR;
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315 }
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316
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317 } else {
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92
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318 if (ngx_add_event(c->read, NGX_READ_EVENT, 0) == NGX_ERROR) {
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0
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319 return NGX_ERROR;
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320 }
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321 }
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322 }
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323
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324 return NGX_OK;
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325 }
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326
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327
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122
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328 static ngx_int_t
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42
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329 ngx_disable_accept_events(ngx_cycle_t *cycle)
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0
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330 {
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92
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331 ngx_uint_t i;
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332 ngx_listening_t *ls;
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333 ngx_connection_t *c;
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0
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334
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92
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335 ls = cycle->listening.elts;
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0
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336 for (i = 0; i < cycle->listening.nelts; i++) {
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337
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92
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338 c = ls[i].connection;
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339
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340 if (!c->read->active) {
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341 continue;
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342 }
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0
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343
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344 if (ngx_event_flags & NGX_USE_RTSIG_EVENT) {
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92
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345 if (ngx_del_conn(c, NGX_DISABLE_EVENT) == NGX_ERROR) {
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0
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346 return NGX_ERROR;
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347 }
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348
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349 } else {
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92
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350 if (ngx_del_event(c->read, NGX_READ_EVENT, NGX_DISABLE_EVENT)
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351 == NGX_ERROR)
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0
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352 {
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353 return NGX_ERROR;
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354 }
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355 }
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356 }
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357
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358 return NGX_OK;
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359 }
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360
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361
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42
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362 static void
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92
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363 ngx_close_accepted_connection(ngx_connection_t *c)
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0
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364 {
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92
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365 ngx_socket_t fd;
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366
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367 ngx_free_connection(c);
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368
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369 fd = c->fd;
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370 c->fd = (ngx_socket_t) -1;
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371
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372 if (ngx_close_socket(fd) == -1) {
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373 ngx_log_error(NGX_LOG_ALERT, c->log, ngx_socket_errno,
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0
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374 ngx_close_socket_n " failed");
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375 }
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44
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376
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92
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377 if (c->pool) {
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378 ngx_destroy_pool(c->pool);
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379 }
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380
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44
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381 #if (NGX_STAT_STUB)
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110
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382 ngx_atomic_fetch_add(ngx_stat_active, -1);
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44
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383 #endif
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0
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384 }
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385
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386
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92
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387 u_char *
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42
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388 ngx_accept_log_error(ngx_log_t *log, u_char *buf, size_t len)
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0
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389 {
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92
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390 return ngx_snprintf(buf, len, " while accepting new connection on %V",
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391 log->data);
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0
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392 }
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