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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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608
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29 #if (NGX_HAVE_ACCEPT4)
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30 static ngx_uint_t use_accept4 = 1;
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31 #endif
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0
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32
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33 ecf = ngx_event_get_conf(ngx_cycle->conf_ctx, ngx_event_core_module);
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34
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35 if (ngx_event_flags & NGX_USE_RTSIG_EVENT) {
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36 ev->available = 1;
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37
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4
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38 } else if (!(ngx_event_flags & NGX_USE_KQUEUE_EVENT)) {
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0
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39 ev->available = ecf->multi_accept;
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40 }
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41
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92
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42 lc = ev->data;
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43 ls = lc->listening;
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44 ev->ready = 0;
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0
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45
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46 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, ev->log, 0,
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92
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47 "accept on %V, ready: %d", &ls->addr_text, ev->available);
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0
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48
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49 do {
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448
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50 socklen = NGX_SOCKADDRLEN;
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0
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51
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604
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52 #if (NGX_HAVE_ACCEPT4)
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608
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53 if (use_accept4) {
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54 s = accept4(lc->fd, (struct sockaddr *) sa, &socklen,
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55 SOCK_NONBLOCK);
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56 } else {
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57 s = accept(lc->fd, (struct sockaddr *) sa, &socklen);
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58 }
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604
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59 #else
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236
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60 s = accept(lc->fd, (struct sockaddr *) sa, &socklen);
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604
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61 #endif
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26
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62
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0
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63 if (s == -1) {
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64 err = ngx_socket_errno;
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65
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66 if (err == NGX_EAGAIN) {
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236
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67 ngx_log_debug0(NGX_LOG_DEBUG_EVENT, ev->log, err,
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68 "accept() not ready");
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0
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69 return;
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70 }
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71
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608
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72 #if (NGX_HAVE_ACCEPT4)
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73 ngx_log_error((ngx_uint_t) ((err == NGX_ECONNABORTED) ?
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74 NGX_LOG_ERR : NGX_LOG_ALERT),
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75 ev->log, err,
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76 use_accept4 ? "accept4() failed" : "accept() failed");
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77
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78 if (use_accept4 && err == NGX_ENOSYS) {
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79 use_accept4 = 0;
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80 ngx_inherited_nonblocking = 0;
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81 continue;
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82 }
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83 #else
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480
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84 ngx_log_error((ngx_uint_t) ((err == NGX_ECONNABORTED) ?
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85 NGX_LOG_ERR : NGX_LOG_ALERT),
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92
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86 ev->log, err, "accept() failed");
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608
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87 #endif
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0
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88
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89 if (err == NGX_ECONNABORTED) {
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4
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90 if (ngx_event_flags & NGX_USE_KQUEUE_EVENT) {
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0
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91 ev->available--;
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92 }
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93
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94 if (ev->available) {
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95 continue;
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96 }
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97 }
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98
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99 return;
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100 }
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101
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102 #if (NGX_STAT_STUB)
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502
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103 (void) ngx_atomic_fetch_add(ngx_stat_accepted, 1);
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0
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104 #endif
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105
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412
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106 ngx_accept_disabled = ngx_cycle->connection_n / 8
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92
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107 - ngx_cycle->free_connection_n;
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108
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109 c = ngx_get_connection(s, ev->log);
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0
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110
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92
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111 if (c == NULL) {
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112 if (ngx_close_socket(s) == -1) {
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113 ngx_log_error(NGX_LOG_ALERT, ev->log, ngx_socket_errno,
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114 ngx_close_socket_n " failed");
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115 }
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0
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116
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92
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117 return;
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118 }
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119
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184
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120 #if (NGX_STAT_STUB)
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502
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121 (void) ngx_atomic_fetch_add(ngx_stat_active, 1);
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184
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122 #endif
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123
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92
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124 c->pool = ngx_create_pool(ls->pool_size, ev->log);
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125 if (c->pool == NULL) {
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126 ngx_close_accepted_connection(c);
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127 return;
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128 }
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0
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129
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236
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130 c->sockaddr = ngx_palloc(c->pool, socklen);
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92
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131 if (c->sockaddr == NULL) {
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132 ngx_close_accepted_connection(c);
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133 return;
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134 }
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135
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236
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136 ngx_memcpy(c->sockaddr, sa, socklen);
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92
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137
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138 log = ngx_palloc(c->pool, sizeof(ngx_log_t));
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139 if (log == NULL) {
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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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36
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144 /* set a blocking mode for aio and non-blocking mode for others */
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0
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145
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146 if (ngx_inherited_nonblocking) {
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92
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147 if (ngx_event_flags & NGX_USE_AIO_EVENT) {
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0
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148 if (ngx_blocking(s) == -1) {
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92
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149 ngx_log_error(NGX_LOG_ALERT, ev->log, ngx_socket_errno,
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0
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150 ngx_blocking_n " failed");
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92
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151 ngx_close_accepted_connection(c);
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0
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152 return;
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153 }
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154 }
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155
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156 } else {
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157 if (!(ngx_event_flags & (NGX_USE_AIO_EVENT|NGX_USE_RTSIG_EVENT))) {
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158 if (ngx_nonblocking(s) == -1) {
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92
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159 ngx_log_error(NGX_LOG_ALERT, ev->log, ngx_socket_errno,
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0
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160 ngx_nonblocking_n " failed");
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92
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161 ngx_close_accepted_connection(c);
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0
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162 return;
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163 }
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164 }
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165 }
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166
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92
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167 *log = ls->log;
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168
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169 c->recv = ngx_recv;
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170 c->send = ngx_send;
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126
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171 c->recv_chain = ngx_recv_chain;
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92
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172 c->send_chain = ngx_send_chain;
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0
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173
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92
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174 c->log = log;
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175 c->pool->log = log;
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0
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176
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448
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177 c->socklen = socklen;
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92
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178 c->listening = ls;
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448
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179 c->local_sockaddr = ls->sockaddr;
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92
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180
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181 c->unexpected_eof = 1;
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182
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538
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183 #if (NGX_HAVE_UNIX_DOMAIN)
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184 if (c->sockaddr->sa_family == AF_UNIX) {
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185 c->tcp_nopush = NGX_TCP_NOPUSH_DISABLED;
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186 c->tcp_nodelay = NGX_TCP_NODELAY_DISABLED;
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187 #if (NGX_SOLARIS)
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188 /* Solaris's sendfilev() supports AF_NCA, AF_INET, and AF_INET6 */
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189 c->sendfile = 0;
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190 #endif
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191 }
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192 #endif
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193
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110
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194 rev = c->read;
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195 wev = c->write;
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0
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196
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197 wev->ready = 1;
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198
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199 if (ngx_event_flags & (NGX_USE_AIO_EVENT|NGX_USE_RTSIG_EVENT)) {
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42
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200 /* rtsig, aio, iocp */
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0
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201 rev->ready = 1;
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202 }
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203
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204 if (ev->deferred_accept) {
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205 rev->ready = 1;
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72
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206 #if (NGX_HAVE_KQUEUE)
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207 rev->available = 1;
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208 #endif
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0
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209 }
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210
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211 rev->log = log;
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212 wev->log = log;
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213
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214 /*
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110
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215 * TODO: MT: - ngx_atomic_fetch_add()
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0
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216 * or protection by critical section or light mutex
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217 *
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218 * TODO: MP: - allocated in a shared memory
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110
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219 * - ngx_atomic_fetch_add()
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0
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220 * or protection by critical section or light mutex
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221 */
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222
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110
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223 c->number = ngx_atomic_fetch_add(ngx_connection_counter, 1);
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0
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224
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44
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225 #if (NGX_STAT_STUB)
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502
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226 (void) ngx_atomic_fetch_add(ngx_stat_handled, 1);
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44
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227 #endif
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228
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0
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229 #if (NGX_THREADS)
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230 rev->lock = &c->lock;
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231 wev->lock = &c->lock;
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232 rev->own_lock = &c->lock;
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233 wev->own_lock = &c->lock;
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234 #endif
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235
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92
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236 if (ls->addr_ntop) {
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382
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237 c->addr_text.data = ngx_pnalloc(c->pool, ls->addr_text_max_len);
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0
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238 if (c->addr_text.data == NULL) {
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92
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239 ngx_close_accepted_connection(c);
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0
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240 return;
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241 }
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126
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242
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400
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243 c->addr_text.len = ngx_sock_ntop(c->sockaddr, c->addr_text.data,
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448
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244 ls->addr_text_max_len, 0);
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0
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245 if (c->addr_text.len == 0) {
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92
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246 ngx_close_accepted_connection(c);
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0
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247 return;
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248 }
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249 }
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250
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251 #if (NGX_DEBUG)
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252 {
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253
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254 in_addr_t i;
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214
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255 ngx_event_debug_t *dc;
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28
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256 struct sockaddr_in *sin;
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0
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257
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28
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258 sin = (struct sockaddr_in *) sa;
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214
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259 dc = ecf->debug_connection.elts;
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0
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260 for (i = 0; i < ecf->debug_connection.nelts; i++) {
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214
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261 if ((sin->sin_addr.s_addr & dc[i].mask) == dc[i].addr) {
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0
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262 log->log_level = NGX_LOG_DEBUG_CONNECTION|NGX_LOG_DEBUG_ALL;
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263 break;
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264 }
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265 }
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266
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267 }
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268 #endif
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269
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214
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270 ngx_log_debug3(NGX_LOG_DEBUG_EVENT, log, 0,
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271 "*%d accept: %V fd:%d", c->number, &c->addr_text, s);
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272
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0
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273 if (ngx_add_conn && (ngx_event_flags & NGX_USE_EPOLL_EVENT) == 0) {
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274 if (ngx_add_conn(c) == NGX_ERROR) {
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92
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275 ngx_close_accepted_connection(c);
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0
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276 return;
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277 }
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278 }
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279
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280 log->data = NULL;
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281 log->handler = NULL;
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282
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92
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283 ls->handler(c);
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0
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284
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4
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285 if (ngx_event_flags & NGX_USE_KQUEUE_EVENT) {
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0
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286 ev->available--;
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287 }
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288
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289 } while (ev->available);
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290 }
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291
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292
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42
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293 ngx_int_t
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294 ngx_trylock_accept_mutex(ngx_cycle_t *cycle)
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0
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295 {
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160
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296 if (ngx_shmtx_trylock(&ngx_accept_mutex)) {
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297
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0
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298 ngx_log_debug0(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
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299 "accept mutex locked");
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300
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236
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301 if (ngx_accept_mutex_held
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302 && ngx_accept_events == 0
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303 && !(ngx_event_flags & NGX_USE_RTSIG_EVENT))
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304 {
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122
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305 return NGX_OK;
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306 }
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0
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307
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122
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308 if (ngx_enable_accept_events(cycle) == NGX_ERROR) {
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160
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309 ngx_shmtx_unlock(&ngx_accept_mutex);
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122
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310 return NGX_ERROR;
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0
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311 }
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312
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236
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313 ngx_accept_events = 0;
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122
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314 ngx_accept_mutex_held = 1;
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315
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0
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316 return NGX_OK;
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317 }
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318
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236
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319 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
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320 "accept mutex lock failed: %ui", ngx_accept_mutex_held);
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321
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0
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322 if (ngx_accept_mutex_held) {
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323 if (ngx_disable_accept_events(cycle) == NGX_ERROR) {
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324 return NGX_ERROR;
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325 }
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326
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327 ngx_accept_mutex_held = 0;
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328 }
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329
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330 return NGX_OK;
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331 }
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332
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333
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122
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334 static ngx_int_t
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42
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335 ngx_enable_accept_events(ngx_cycle_t *cycle)
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0
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336 {
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92
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337 ngx_uint_t i;
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338 ngx_listening_t *ls;
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339 ngx_connection_t *c;
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0
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340
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92
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341 ls = cycle->listening.elts;
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0
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342 for (i = 0; i < cycle->listening.nelts; i++) {
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343
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92
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344 c = ls[i].connection;
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0
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345
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346 if (ngx_event_flags & NGX_USE_RTSIG_EVENT) {
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122
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347
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92
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348 if (ngx_add_conn(c) == NGX_ERROR) {
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0
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349 return NGX_ERROR;
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350 }
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351
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|
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352 } else {
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92
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353 if (ngx_add_event(c->read, NGX_READ_EVENT, 0) == NGX_ERROR) {
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0
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354 return NGX_ERROR;
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355 }
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356 }
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357 }
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358
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359 return NGX_OK;
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360 }
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361
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362
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122
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363 static ngx_int_t
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42
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364 ngx_disable_accept_events(ngx_cycle_t *cycle)
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0
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365 {
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92
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366 ngx_uint_t i;
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367 ngx_listening_t *ls;
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368 ngx_connection_t *c;
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0
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369
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92
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370 ls = cycle->listening.elts;
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0
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371 for (i = 0; i < cycle->listening.nelts; i++) {
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372
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92
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373 c = ls[i].connection;
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374
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375 if (!c->read->active) {
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376 continue;
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377 }
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0
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378
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379 if (ngx_event_flags & NGX_USE_RTSIG_EVENT) {
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92
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380 if (ngx_del_conn(c, NGX_DISABLE_EVENT) == NGX_ERROR) {
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0
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381 return NGX_ERROR;
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382 }
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383
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384 } else {
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92
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385 if (ngx_del_event(c->read, NGX_READ_EVENT, NGX_DISABLE_EVENT)
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386 == NGX_ERROR)
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0
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387 {
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388 return NGX_ERROR;
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389 }
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390 }
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391 }
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392
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393 return NGX_OK;
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|
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394 }
|
|
|
395
|
|
|
396
|
|
42
|
397 static void
|
|
92
|
398 ngx_close_accepted_connection(ngx_connection_t *c)
|
|
0
|
399 {
|
|
92
|
400 ngx_socket_t fd;
|
|
|
401
|
|
|
402 ngx_free_connection(c);
|
|
|
403
|
|
|
404 fd = c->fd;
|
|
|
405 c->fd = (ngx_socket_t) -1;
|
|
|
406
|
|
|
407 if (ngx_close_socket(fd) == -1) {
|
|
|
408 ngx_log_error(NGX_LOG_ALERT, c->log, ngx_socket_errno,
|
|
0
|
409 ngx_close_socket_n " failed");
|
|
|
410 }
|
|
44
|
411
|
|
92
|
412 if (c->pool) {
|
|
|
413 ngx_destroy_pool(c->pool);
|
|
|
414 }
|
|
|
415
|
|
44
|
416 #if (NGX_STAT_STUB)
|
|
502
|
417 (void) ngx_atomic_fetch_add(ngx_stat_active, -1);
|
|
44
|
418 #endif
|
|
0
|
419 }
|
|
|
420
|
|
|
421
|
|
92
|
422 u_char *
|
|
42
|
423 ngx_accept_log_error(ngx_log_t *log, u_char *buf, size_t len)
|
|
0
|
424 {
|
|
92
|
425 return ngx_snprintf(buf, len, " while accepting new connection on %V",
|
|
|
426 log->data);
|
|
0
|
427 }
|
