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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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660
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4 * Copyright (C) Nginx, Inc.
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0
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5 */
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6
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7
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8 #include <ngx_config.h>
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9 #include <ngx_core.h>
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10 #include <ngx_event.h>
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11
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12
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122
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13 static ngx_int_t ngx_enable_accept_events(ngx_cycle_t *cycle);
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14 static ngx_int_t ngx_disable_accept_events(ngx_cycle_t *cycle);
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92
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15 static void ngx_close_accepted_connection(ngx_connection_t *c);
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0
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16
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17
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42
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18 void
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19 ngx_event_accept(ngx_event_t *ev)
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0
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20 {
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236
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21 socklen_t socklen;
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32
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22 ngx_err_t err;
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23 ngx_log_t *log;
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24 ngx_socket_t s;
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25 ngx_event_t *rev, *wev;
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92
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26 ngx_listening_t *ls;
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27 ngx_connection_t *c, *lc;
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32
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28 ngx_event_conf_t *ecf;
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448
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29 u_char sa[NGX_SOCKADDRLEN];
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608
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30 #if (NGX_HAVE_ACCEPT4)
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31 static ngx_uint_t use_accept4 = 1;
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32 #endif
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0
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33
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34 ecf = ngx_event_get_conf(ngx_cycle->conf_ctx, ngx_event_core_module);
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35
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36 if (ngx_event_flags & NGX_USE_RTSIG_EVENT) {
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37 ev->available = 1;
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38
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4
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39 } else if (!(ngx_event_flags & NGX_USE_KQUEUE_EVENT)) {
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0
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40 ev->available = ecf->multi_accept;
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41 }
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42
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92
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43 lc = ev->data;
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44 ls = lc->listening;
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45 ev->ready = 0;
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0
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46
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47 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, ev->log, 0,
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92
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48 "accept on %V, ready: %d", &ls->addr_text, ev->available);
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0
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49
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50 do {
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448
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51 socklen = NGX_SOCKADDRLEN;
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0
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52
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604
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53 #if (NGX_HAVE_ACCEPT4)
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608
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54 if (use_accept4) {
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55 s = accept4(lc->fd, (struct sockaddr *) sa, &socklen,
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56 SOCK_NONBLOCK);
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57 } else {
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58 s = accept(lc->fd, (struct sockaddr *) sa, &socklen);
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59 }
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604
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60 #else
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236
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61 s = accept(lc->fd, (struct sockaddr *) sa, &socklen);
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604
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62 #endif
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26
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63
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0
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64 if (s == -1) {
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65 err = ngx_socket_errno;
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66
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67 if (err == NGX_EAGAIN) {
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236
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68 ngx_log_debug0(NGX_LOG_DEBUG_EVENT, ev->log, err,
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69 "accept() not ready");
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0
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70 return;
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71 }
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72
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608
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73 #if (NGX_HAVE_ACCEPT4)
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74 ngx_log_error((ngx_uint_t) ((err == NGX_ECONNABORTED) ?
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75 NGX_LOG_ERR : NGX_LOG_ALERT),
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76 ev->log, err,
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77 use_accept4 ? "accept4() failed" : "accept() failed");
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78
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79 if (use_accept4 && err == NGX_ENOSYS) {
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80 use_accept4 = 0;
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81 ngx_inherited_nonblocking = 0;
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82 continue;
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83 }
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84 #else
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480
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85 ngx_log_error((ngx_uint_t) ((err == NGX_ECONNABORTED) ?
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86 NGX_LOG_ERR : NGX_LOG_ALERT),
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92
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87 ev->log, err, "accept() failed");
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608
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88 #endif
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0
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89
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90 if (err == NGX_ECONNABORTED) {
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4
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91 if (ngx_event_flags & NGX_USE_KQUEUE_EVENT) {
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0
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92 ev->available--;
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93 }
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94
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95 if (ev->available) {
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96 continue;
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97 }
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98 }
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99
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100 return;
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101 }
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102
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103 #if (NGX_STAT_STUB)
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502
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104 (void) ngx_atomic_fetch_add(ngx_stat_accepted, 1);
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0
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105 #endif
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106
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412
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107 ngx_accept_disabled = ngx_cycle->connection_n / 8
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92
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108 - ngx_cycle->free_connection_n;
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109
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110 c = ngx_get_connection(s, ev->log);
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0
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111
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92
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112 if (c == NULL) {
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113 if (ngx_close_socket(s) == -1) {
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114 ngx_log_error(NGX_LOG_ALERT, ev->log, ngx_socket_errno,
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115 ngx_close_socket_n " failed");
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116 }
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0
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117
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92
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118 return;
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119 }
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120
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184
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121 #if (NGX_STAT_STUB)
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502
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122 (void) ngx_atomic_fetch_add(ngx_stat_active, 1);
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184
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123 #endif
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124
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92
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125 c->pool = ngx_create_pool(ls->pool_size, ev->log);
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126 if (c->pool == NULL) {
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127 ngx_close_accepted_connection(c);
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128 return;
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129 }
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0
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130
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236
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131 c->sockaddr = ngx_palloc(c->pool, socklen);
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92
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132 if (c->sockaddr == NULL) {
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133 ngx_close_accepted_connection(c);
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134 return;
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135 }
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136
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236
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137 ngx_memcpy(c->sockaddr, sa, socklen);
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92
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138
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139 log = ngx_palloc(c->pool, sizeof(ngx_log_t));
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140 if (log == NULL) {
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141 ngx_close_accepted_connection(c);
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0
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142 return;
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143 }
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144
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36
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145 /* set a blocking mode for aio and non-blocking mode for others */
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0
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146
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147 if (ngx_inherited_nonblocking) {
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92
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148 if (ngx_event_flags & NGX_USE_AIO_EVENT) {
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0
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149 if (ngx_blocking(s) == -1) {
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92
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150 ngx_log_error(NGX_LOG_ALERT, ev->log, ngx_socket_errno,
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0
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151 ngx_blocking_n " failed");
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92
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152 ngx_close_accepted_connection(c);
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0
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153 return;
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154 }
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155 }
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156
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157 } else {
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158 if (!(ngx_event_flags & (NGX_USE_AIO_EVENT|NGX_USE_RTSIG_EVENT))) {
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159 if (ngx_nonblocking(s) == -1) {
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92
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160 ngx_log_error(NGX_LOG_ALERT, ev->log, ngx_socket_errno,
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0
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161 ngx_nonblocking_n " failed");
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92
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162 ngx_close_accepted_connection(c);
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0
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163 return;
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164 }
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165 }
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166 }
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167
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92
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168 *log = ls->log;
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169
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170 c->recv = ngx_recv;
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171 c->send = ngx_send;
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126
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172 c->recv_chain = ngx_recv_chain;
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92
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173 c->send_chain = ngx_send_chain;
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0
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174
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92
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175 c->log = log;
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176 c->pool->log = log;
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0
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177
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448
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178 c->socklen = socklen;
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92
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179 c->listening = ls;
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448
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180 c->local_sockaddr = ls->sockaddr;
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92
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181
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182 c->unexpected_eof = 1;
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183
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538
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184 #if (NGX_HAVE_UNIX_DOMAIN)
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185 if (c->sockaddr->sa_family == AF_UNIX) {
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186 c->tcp_nopush = NGX_TCP_NOPUSH_DISABLED;
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187 c->tcp_nodelay = NGX_TCP_NODELAY_DISABLED;
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188 #if (NGX_SOLARIS)
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189 /* Solaris's sendfilev() supports AF_NCA, AF_INET, and AF_INET6 */
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190 c->sendfile = 0;
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191 #endif
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192 }
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193 #endif
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194
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110
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195 rev = c->read;
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196 wev = c->write;
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0
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197
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198 wev->ready = 1;
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199
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200 if (ngx_event_flags & (NGX_USE_AIO_EVENT|NGX_USE_RTSIG_EVENT)) {
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42
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201 /* rtsig, aio, iocp */
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0
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202 rev->ready = 1;
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203 }
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204
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205 if (ev->deferred_accept) {
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206 rev->ready = 1;
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72
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207 #if (NGX_HAVE_KQUEUE)
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208 rev->available = 1;
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209 #endif
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0
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210 }
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211
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212 rev->log = log;
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213 wev->log = log;
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214
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215 /*
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110
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216 * TODO: MT: - ngx_atomic_fetch_add()
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0
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217 * or protection by critical section or light mutex
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218 *
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219 * TODO: MP: - allocated in a shared memory
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110
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220 * - ngx_atomic_fetch_add()
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0
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221 * or protection by critical section or light mutex
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222 */
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223
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110
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224 c->number = ngx_atomic_fetch_add(ngx_connection_counter, 1);
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0
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225
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44
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226 #if (NGX_STAT_STUB)
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502
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227 (void) ngx_atomic_fetch_add(ngx_stat_handled, 1);
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44
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228 #endif
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229
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0
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230 #if (NGX_THREADS)
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231 rev->lock = &c->lock;
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232 wev->lock = &c->lock;
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233 rev->own_lock = &c->lock;
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234 wev->own_lock = &c->lock;
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235 #endif
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236
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92
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237 if (ls->addr_ntop) {
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382
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238 c->addr_text.data = ngx_pnalloc(c->pool, ls->addr_text_max_len);
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0
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239 if (c->addr_text.data == NULL) {
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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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126
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243
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400
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244 c->addr_text.len = ngx_sock_ntop(c->sockaddr, c->addr_text.data,
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448
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245 ls->addr_text_max_len, 0);
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0
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246 if (c->addr_text.len == 0) {
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92
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247 ngx_close_accepted_connection(c);
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0
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248 return;
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249 }
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250 }
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251
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252 #if (NGX_DEBUG)
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253 {
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254
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255 in_addr_t i;
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214
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256 ngx_event_debug_t *dc;
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28
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257 struct sockaddr_in *sin;
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0
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258
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28
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259 sin = (struct sockaddr_in *) sa;
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214
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260 dc = ecf->debug_connection.elts;
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0
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261 for (i = 0; i < ecf->debug_connection.nelts; i++) {
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214
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262 if ((sin->sin_addr.s_addr & dc[i].mask) == dc[i].addr) {
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0
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263 log->log_level = NGX_LOG_DEBUG_CONNECTION|NGX_LOG_DEBUG_ALL;
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264 break;
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265 }
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266 }
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267
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268 }
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269 #endif
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270
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214
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271 ngx_log_debug3(NGX_LOG_DEBUG_EVENT, log, 0,
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272 "*%d accept: %V fd:%d", c->number, &c->addr_text, s);
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273
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0
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274 if (ngx_add_conn && (ngx_event_flags & NGX_USE_EPOLL_EVENT) == 0) {
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275 if (ngx_add_conn(c) == NGX_ERROR) {
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92
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276 ngx_close_accepted_connection(c);
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0
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277 return;
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278 }
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279 }
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280
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281 log->data = NULL;
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282 log->handler = NULL;
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283
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92
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284 ls->handler(c);
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0
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285
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4
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286 if (ngx_event_flags & NGX_USE_KQUEUE_EVENT) {
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0
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287 ev->available--;
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288 }
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289
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290 } while (ev->available);
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291 }
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292
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293
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42
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294 ngx_int_t
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295 ngx_trylock_accept_mutex(ngx_cycle_t *cycle)
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0
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296 {
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160
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297 if (ngx_shmtx_trylock(&ngx_accept_mutex)) {
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298
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0
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299 ngx_log_debug0(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
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300 "accept mutex locked");
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301
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236
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302 if (ngx_accept_mutex_held
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303 && ngx_accept_events == 0
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304 && !(ngx_event_flags & NGX_USE_RTSIG_EVENT))
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305 {
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122
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306 return NGX_OK;
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307 }
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0
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308
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122
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309 if (ngx_enable_accept_events(cycle) == NGX_ERROR) {
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160
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310 ngx_shmtx_unlock(&ngx_accept_mutex);
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122
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311 return NGX_ERROR;
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0
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312 }
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313
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236
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314 ngx_accept_events = 0;
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122
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315 ngx_accept_mutex_held = 1;
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316
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0
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317 return NGX_OK;
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318 }
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319
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236
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320 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
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321 "accept mutex lock failed: %ui", ngx_accept_mutex_held);
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322
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0
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323 if (ngx_accept_mutex_held) {
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324 if (ngx_disable_accept_events(cycle) == NGX_ERROR) {
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325 return NGX_ERROR;
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326 }
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327
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328 ngx_accept_mutex_held = 0;
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329 }
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330
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331 return NGX_OK;
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332 }
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333
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334
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122
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335 static ngx_int_t
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42
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336 ngx_enable_accept_events(ngx_cycle_t *cycle)
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0
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337 {
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92
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338 ngx_uint_t i;
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339 ngx_listening_t *ls;
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340 ngx_connection_t *c;
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0
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341
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92
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342 ls = cycle->listening.elts;
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0
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343 for (i = 0; i < cycle->listening.nelts; i++) {
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344
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92
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345 c = ls[i].connection;
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0
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346
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347 if (ngx_event_flags & NGX_USE_RTSIG_EVENT) {
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122
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348
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92
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349 if (ngx_add_conn(c) == NGX_ERROR) {
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0
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350 return NGX_ERROR;
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351 }
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352
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|
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353 } else {
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92
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354 if (ngx_add_event(c->read, NGX_READ_EVENT, 0) == NGX_ERROR) {
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0
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355 return NGX_ERROR;
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356 }
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357 }
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358 }
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359
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360 return NGX_OK;
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361 }
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362
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363
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122
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364 static ngx_int_t
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42
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365 ngx_disable_accept_events(ngx_cycle_t *cycle)
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0
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366 {
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92
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367 ngx_uint_t i;
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368 ngx_listening_t *ls;
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369 ngx_connection_t *c;
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0
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370
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92
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371 ls = cycle->listening.elts;
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0
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372 for (i = 0; i < cycle->listening.nelts; i++) {
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373
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92
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374 c = ls[i].connection;
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375
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376 if (!c->read->active) {
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377 continue;
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378 }
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0
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379
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380 if (ngx_event_flags & NGX_USE_RTSIG_EVENT) {
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92
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381 if (ngx_del_conn(c, NGX_DISABLE_EVENT) == NGX_ERROR) {
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0
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382 return NGX_ERROR;
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383 }
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384
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|
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385 } else {
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92
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386 if (ngx_del_event(c->read, NGX_READ_EVENT, NGX_DISABLE_EVENT)
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387 == NGX_ERROR)
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0
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388 {
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389 return NGX_ERROR;
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390 }
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|
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391 }
|
|
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392 }
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393
|
|
|
394 return NGX_OK;
|
|
|
395 }
|
|
|
396
|
|
|
397
|
|
42
|
398 static void
|
|
92
|
399 ngx_close_accepted_connection(ngx_connection_t *c)
|
|
0
|
400 {
|
|
92
|
401 ngx_socket_t fd;
|
|
|
402
|
|
|
403 ngx_free_connection(c);
|
|
|
404
|
|
|
405 fd = c->fd;
|
|
|
406 c->fd = (ngx_socket_t) -1;
|
|
|
407
|
|
|
408 if (ngx_close_socket(fd) == -1) {
|
|
|
409 ngx_log_error(NGX_LOG_ALERT, c->log, ngx_socket_errno,
|
|
0
|
410 ngx_close_socket_n " failed");
|
|
|
411 }
|
|
44
|
412
|
|
92
|
413 if (c->pool) {
|
|
|
414 ngx_destroy_pool(c->pool);
|
|
|
415 }
|
|
|
416
|
|
44
|
417 #if (NGX_STAT_STUB)
|
|
502
|
418 (void) ngx_atomic_fetch_add(ngx_stat_active, -1);
|
|
44
|
419 #endif
|
|
0
|
420 }
|
|
|
421
|
|
|
422
|
|
92
|
423 u_char *
|
|
42
|
424 ngx_accept_log_error(ngx_log_t *log, u_char *buf, size_t len)
|
|
0
|
425 {
|
|
92
|
426 return ngx_snprintf(buf, len, " while accepting new connection on %V",
|
|
|
427 log->data);
|
|
0
|
428 }
|
