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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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604
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49 #if (NGX_HAVE_ACCEPT4)
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50 s = accept4(lc->fd, (struct sockaddr *) sa, &socklen, SOCK_NONBLOCK);
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51 #else
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236
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52 s = accept(lc->fd, (struct sockaddr *) sa, &socklen);
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604
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53 #endif
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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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236
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59 ngx_log_debug0(NGX_LOG_DEBUG_EVENT, ev->log, err,
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60 "accept() not ready");
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0
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61 return;
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62 }
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63
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480
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64 ngx_log_error((ngx_uint_t) ((err == NGX_ECONNABORTED) ?
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65 NGX_LOG_ERR : NGX_LOG_ALERT),
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92
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66 ev->log, err, "accept() failed");
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0
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67
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68 if (err == NGX_ECONNABORTED) {
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4
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69 if (ngx_event_flags & NGX_USE_KQUEUE_EVENT) {
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0
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70 ev->available--;
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71 }
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72
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73 if (ev->available) {
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74 continue;
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75 }
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76 }
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77
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78 return;
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79 }
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80
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81 #if (NGX_STAT_STUB)
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502
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82 (void) ngx_atomic_fetch_add(ngx_stat_accepted, 1);
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0
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83 #endif
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84
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412
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85 ngx_accept_disabled = ngx_cycle->connection_n / 8
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92
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86 - ngx_cycle->free_connection_n;
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87
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88 c = ngx_get_connection(s, ev->log);
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0
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89
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92
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90 if (c == NULL) {
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91 if (ngx_close_socket(s) == -1) {
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92 ngx_log_error(NGX_LOG_ALERT, ev->log, ngx_socket_errno,
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93 ngx_close_socket_n " failed");
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94 }
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0
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95
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92
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96 return;
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97 }
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98
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184
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99 #if (NGX_STAT_STUB)
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502
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100 (void) ngx_atomic_fetch_add(ngx_stat_active, 1);
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184
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101 #endif
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102
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92
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103 c->pool = ngx_create_pool(ls->pool_size, ev->log);
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104 if (c->pool == NULL) {
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105 ngx_close_accepted_connection(c);
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106 return;
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107 }
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0
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108
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236
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109 c->sockaddr = ngx_palloc(c->pool, socklen);
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92
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110 if (c->sockaddr == NULL) {
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111 ngx_close_accepted_connection(c);
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112 return;
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113 }
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114
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236
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115 ngx_memcpy(c->sockaddr, sa, socklen);
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92
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116
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117 log = ngx_palloc(c->pool, sizeof(ngx_log_t));
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118 if (log == NULL) {
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119 ngx_close_accepted_connection(c);
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0
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120 return;
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121 }
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122
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36
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123 /* set a blocking mode for aio and non-blocking mode for others */
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0
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124
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125 if (ngx_inherited_nonblocking) {
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92
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126 if (ngx_event_flags & NGX_USE_AIO_EVENT) {
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0
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127 if (ngx_blocking(s) == -1) {
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92
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128 ngx_log_error(NGX_LOG_ALERT, ev->log, ngx_socket_errno,
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0
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129 ngx_blocking_n " failed");
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92
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130 ngx_close_accepted_connection(c);
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0
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131 return;
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132 }
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133 }
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134
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135 } else {
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136 if (!(ngx_event_flags & (NGX_USE_AIO_EVENT|NGX_USE_RTSIG_EVENT))) {
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137 if (ngx_nonblocking(s) == -1) {
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92
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138 ngx_log_error(NGX_LOG_ALERT, ev->log, ngx_socket_errno,
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0
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139 ngx_nonblocking_n " failed");
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92
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140 ngx_close_accepted_connection(c);
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0
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141 return;
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142 }
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143 }
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144 }
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145
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92
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146 *log = ls->log;
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147
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148 c->recv = ngx_recv;
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149 c->send = ngx_send;
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126
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150 c->recv_chain = ngx_recv_chain;
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92
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151 c->send_chain = ngx_send_chain;
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0
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152
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92
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153 c->log = log;
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154 c->pool->log = log;
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0
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155
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448
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156 c->socklen = socklen;
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92
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157 c->listening = ls;
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448
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158 c->local_sockaddr = ls->sockaddr;
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92
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159
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160 c->unexpected_eof = 1;
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161
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538
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162 #if (NGX_HAVE_UNIX_DOMAIN)
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163 if (c->sockaddr->sa_family == AF_UNIX) {
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164 c->tcp_nopush = NGX_TCP_NOPUSH_DISABLED;
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165 c->tcp_nodelay = NGX_TCP_NODELAY_DISABLED;
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166 #if (NGX_SOLARIS)
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167 /* Solaris's sendfilev() supports AF_NCA, AF_INET, and AF_INET6 */
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168 c->sendfile = 0;
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169 #endif
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170 }
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171 #endif
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172
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110
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173 rev = c->read;
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174 wev = c->write;
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0
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175
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176 wev->ready = 1;
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177
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178 if (ngx_event_flags & (NGX_USE_AIO_EVENT|NGX_USE_RTSIG_EVENT)) {
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42
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179 /* rtsig, aio, iocp */
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0
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180 rev->ready = 1;
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181 }
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182
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183 if (ev->deferred_accept) {
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184 rev->ready = 1;
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72
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185 #if (NGX_HAVE_KQUEUE)
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186 rev->available = 1;
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187 #endif
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0
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188 }
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189
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190 rev->log = log;
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191 wev->log = log;
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192
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193 /*
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110
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194 * TODO: MT: - ngx_atomic_fetch_add()
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0
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195 * or protection by critical section or light mutex
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196 *
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197 * TODO: MP: - allocated in a shared memory
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110
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198 * - ngx_atomic_fetch_add()
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0
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199 * or protection by critical section or light mutex
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200 */
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201
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110
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202 c->number = ngx_atomic_fetch_add(ngx_connection_counter, 1);
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0
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203
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44
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204 #if (NGX_STAT_STUB)
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502
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205 (void) ngx_atomic_fetch_add(ngx_stat_handled, 1);
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44
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206 #endif
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207
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0
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208 #if (NGX_THREADS)
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209 rev->lock = &c->lock;
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210 wev->lock = &c->lock;
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211 rev->own_lock = &c->lock;
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212 wev->own_lock = &c->lock;
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213 #endif
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214
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92
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215 if (ls->addr_ntop) {
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382
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216 c->addr_text.data = ngx_pnalloc(c->pool, ls->addr_text_max_len);
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0
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217 if (c->addr_text.data == NULL) {
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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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126
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221
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400
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222 c->addr_text.len = ngx_sock_ntop(c->sockaddr, c->addr_text.data,
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448
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223 ls->addr_text_max_len, 0);
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0
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224 if (c->addr_text.len == 0) {
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92
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225 ngx_close_accepted_connection(c);
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0
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226 return;
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227 }
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228 }
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229
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230 #if (NGX_DEBUG)
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231 {
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232
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233 in_addr_t i;
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214
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234 ngx_event_debug_t *dc;
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28
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235 struct sockaddr_in *sin;
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0
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236
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28
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237 sin = (struct sockaddr_in *) sa;
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214
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238 dc = ecf->debug_connection.elts;
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0
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239 for (i = 0; i < ecf->debug_connection.nelts; i++) {
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214
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240 if ((sin->sin_addr.s_addr & dc[i].mask) == dc[i].addr) {
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0
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241 log->log_level = NGX_LOG_DEBUG_CONNECTION|NGX_LOG_DEBUG_ALL;
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242 break;
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243 }
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244 }
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245
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246 }
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247 #endif
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248
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214
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249 ngx_log_debug3(NGX_LOG_DEBUG_EVENT, log, 0,
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250 "*%d accept: %V fd:%d", c->number, &c->addr_text, s);
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251
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0
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252 if (ngx_add_conn && (ngx_event_flags & NGX_USE_EPOLL_EVENT) == 0) {
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253 if (ngx_add_conn(c) == NGX_ERROR) {
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92
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254 ngx_close_accepted_connection(c);
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0
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255 return;
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256 }
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257 }
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258
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259 log->data = NULL;
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260 log->handler = NULL;
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261
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92
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262 ls->handler(c);
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0
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263
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4
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264 if (ngx_event_flags & NGX_USE_KQUEUE_EVENT) {
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0
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265 ev->available--;
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266 }
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267
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268 } while (ev->available);
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269 }
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270
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271
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42
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272 ngx_int_t
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273 ngx_trylock_accept_mutex(ngx_cycle_t *cycle)
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0
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274 {
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160
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275 if (ngx_shmtx_trylock(&ngx_accept_mutex)) {
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276
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0
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277 ngx_log_debug0(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
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278 "accept mutex locked");
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279
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236
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280 if (ngx_accept_mutex_held
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281 && ngx_accept_events == 0
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282 && !(ngx_event_flags & NGX_USE_RTSIG_EVENT))
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283 {
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122
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284 return NGX_OK;
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285 }
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0
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286
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122
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287 if (ngx_enable_accept_events(cycle) == NGX_ERROR) {
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160
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288 ngx_shmtx_unlock(&ngx_accept_mutex);
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122
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289 return NGX_ERROR;
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0
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290 }
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291
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236
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292 ngx_accept_events = 0;
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122
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293 ngx_accept_mutex_held = 1;
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294
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0
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295 return NGX_OK;
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296 }
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297
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236
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298 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
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299 "accept mutex lock failed: %ui", ngx_accept_mutex_held);
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300
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0
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301 if (ngx_accept_mutex_held) {
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302 if (ngx_disable_accept_events(cycle) == NGX_ERROR) {
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303 return NGX_ERROR;
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304 }
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305
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306 ngx_accept_mutex_held = 0;
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307 }
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308
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309 return NGX_OK;
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310 }
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311
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312
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122
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313 static ngx_int_t
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42
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314 ngx_enable_accept_events(ngx_cycle_t *cycle)
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0
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315 {
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92
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316 ngx_uint_t i;
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317 ngx_listening_t *ls;
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318 ngx_connection_t *c;
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0
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319
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92
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320 ls = cycle->listening.elts;
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0
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321 for (i = 0; i < cycle->listening.nelts; i++) {
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322
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92
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323 c = ls[i].connection;
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0
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324
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325 if (ngx_event_flags & NGX_USE_RTSIG_EVENT) {
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122
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326
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92
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327 if (ngx_add_conn(c) == NGX_ERROR) {
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0
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328 return NGX_ERROR;
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329 }
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330
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331 } else {
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92
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332 if (ngx_add_event(c->read, NGX_READ_EVENT, 0) == NGX_ERROR) {
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0
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333 return NGX_ERROR;
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334 }
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335 }
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336 }
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337
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338 return NGX_OK;
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339 }
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340
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341
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122
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342 static ngx_int_t
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42
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343 ngx_disable_accept_events(ngx_cycle_t *cycle)
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0
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344 {
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92
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345 ngx_uint_t i;
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346 ngx_listening_t *ls;
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347 ngx_connection_t *c;
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0
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348
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92
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349 ls = cycle->listening.elts;
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0
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350 for (i = 0; i < cycle->listening.nelts; i++) {
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351
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92
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352 c = ls[i].connection;
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353
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354 if (!c->read->active) {
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355 continue;
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356 }
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0
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357
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358 if (ngx_event_flags & NGX_USE_RTSIG_EVENT) {
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92
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359 if (ngx_del_conn(c, NGX_DISABLE_EVENT) == NGX_ERROR) {
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0
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360 return NGX_ERROR;
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361 }
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362
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363 } else {
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92
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364 if (ngx_del_event(c->read, NGX_READ_EVENT, NGX_DISABLE_EVENT)
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365 == NGX_ERROR)
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0
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366 {
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367 return NGX_ERROR;
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368 }
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369 }
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370 }
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371
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372 return NGX_OK;
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373 }
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374
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375
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42
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376 static void
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92
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377 ngx_close_accepted_connection(ngx_connection_t *c)
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0
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378 {
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92
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379 ngx_socket_t fd;
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380
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381 ngx_free_connection(c);
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382
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383 fd = c->fd;
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384 c->fd = (ngx_socket_t) -1;
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385
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386 if (ngx_close_socket(fd) == -1) {
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387 ngx_log_error(NGX_LOG_ALERT, c->log, ngx_socket_errno,
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0
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388 ngx_close_socket_n " failed");
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389 }
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44
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390
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92
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391 if (c->pool) {
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392 ngx_destroy_pool(c->pool);
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393 }
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394
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44
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395 #if (NGX_STAT_STUB)
|
|
502
|
396 (void) ngx_atomic_fetch_add(ngx_stat_active, -1);
|
|
44
|
397 #endif
|
|
0
|
398 }
|
|
|
399
|
|
|
400
|
|
92
|
401 u_char *
|
|
42
|
402 ngx_accept_log_error(ngx_log_t *log, u_char *buf, size_t len)
|
|
0
|
403 {
|
|
92
|
404 return ngx_snprintf(buf, len, " while accepting new connection on %V",
|
|
|
405 log->data);
|
|
0
|
406 }
|
