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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18
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12 #if (NGX_TEST_BUILD_EPOLL)
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0
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13
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14 /* epoll declarations */
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15
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16 #define EPOLLIN 0x001
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17 #define EPOLLPRI 0x002
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18 #define EPOLLOUT 0x004
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19 #define EPOLLRDNORM 0x040
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20 #define EPOLLRDBAND 0x080
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21 #define EPOLLWRNORM 0x100
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22 #define EPOLLWRBAND 0x200
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23 #define EPOLLMSG 0x400
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24 #define EPOLLERR 0x008
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25 #define EPOLLHUP 0x010
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26
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27 #define EPOLLET 0x80000000
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28 #define EPOLLONESHOT 0x40000000
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29
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30 #define EPOLL_CTL_ADD 1
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31 #define EPOLL_CTL_DEL 2
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32 #define EPOLL_CTL_MOD 3
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33
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34 typedef union epoll_data {
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35 void *ptr;
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36 int fd;
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37 uint32_t u32;
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38 uint64_t u64;
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39 } epoll_data_t;
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40
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41 struct epoll_event {
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42 uint32_t events;
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43 epoll_data_t data;
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44 };
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45
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46 int epoll_create(int size);
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47 int epoll_ctl(int epfd, int op, int fd, struct epoll_event *event);
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48 int epoll_wait(int epfd, struct epoll_event *events, int nevents, int timeout);
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49
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50 int epoll_create(int size)
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51 {
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52 return -1;
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53 }
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54
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55 int epoll_ctl(int epfd, int op, int fd, struct epoll_event *event)
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56 {
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57 return -1;
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58 }
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59
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60 int epoll_wait(int epfd, struct epoll_event *events, int nevents, int timeout)
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61 {
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62 return -1;
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63 }
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64
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65 #endif
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66
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67
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68 typedef struct {
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69 u_int events;
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70 } ngx_epoll_conf_t;
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71
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72
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48
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73 static ngx_int_t ngx_epoll_init(ngx_cycle_t *cycle);
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0
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74 static void ngx_epoll_done(ngx_cycle_t *cycle);
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48
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75 static ngx_int_t ngx_epoll_add_event(ngx_event_t *ev, int event, u_int flags);
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76 static ngx_int_t ngx_epoll_del_event(ngx_event_t *ev, int event, u_int flags);
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77 static ngx_int_t ngx_epoll_add_connection(ngx_connection_t *c);
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78 static ngx_int_t ngx_epoll_del_connection(ngx_connection_t *c, u_int flags);
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79 static ngx_int_t ngx_epoll_process_events(ngx_cycle_t *cycle);
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0
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80
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81 static void *ngx_epoll_create_conf(ngx_cycle_t *cycle);
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82 static char *ngx_epoll_init_conf(ngx_cycle_t *cycle, void *conf);
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83
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84 static int ep = -1;
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85 static struct epoll_event *event_list;
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86 static u_int nevents;
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87
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88
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89 static ngx_str_t epoll_name = ngx_string("epoll");
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90
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91 static ngx_command_t ngx_epoll_commands[] = {
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92
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48
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93 { ngx_string("epoll_events"),
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94 NGX_EVENT_CONF|NGX_CONF_TAKE1,
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95 ngx_conf_set_num_slot,
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96 0,
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97 offsetof(ngx_epoll_conf_t, events),
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98 NULL },
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0
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99
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48
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100 ngx_null_command
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0
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101 };
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102
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103
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104 ngx_event_module_t ngx_epoll_module_ctx = {
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105 &epoll_name,
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106 ngx_epoll_create_conf, /* create configuration */
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107 ngx_epoll_init_conf, /* init configuration */
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108
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109 {
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110 ngx_epoll_add_event, /* add an event */
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111 ngx_epoll_del_event, /* delete an event */
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112 ngx_epoll_add_event, /* enable an event */
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113 ngx_epoll_del_event, /* disable an event */
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114 ngx_epoll_add_connection, /* add an connection */
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115 ngx_epoll_del_connection, /* delete an connection */
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116 NULL, /* process the changes */
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117 ngx_epoll_process_events, /* process the events */
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118 ngx_epoll_init, /* init the events */
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119 ngx_epoll_done, /* done the events */
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120 }
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121 };
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122
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123 ngx_module_t ngx_epoll_module = {
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124 NGX_MODULE,
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125 &ngx_epoll_module_ctx, /* module context */
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126 ngx_epoll_commands, /* module directives */
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127 NGX_EVENT_MODULE, /* module type */
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128 NULL, /* init module */
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129 NULL /* init process */
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130 };
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131
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132
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48
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133 static ngx_int_t
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134 ngx_epoll_init(ngx_cycle_t *cycle)
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0
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135 {
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136 size_t n;
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137 ngx_event_conf_t *ecf;
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138 ngx_epoll_conf_t *epcf;
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139
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140 ecf = ngx_event_get_conf(cycle->conf_ctx, ngx_event_core_module);
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141
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142 epcf = ngx_event_get_conf(cycle->conf_ctx, ngx_epoll_module);
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143
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144 if (ep == -1) {
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145 ep = epoll_create(ecf->connections / 2);
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146
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147 if (ep == -1) {
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148 ngx_log_error(NGX_LOG_EMERG, cycle->log, ngx_errno,
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149 "epoll_create() failed");
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150 return NGX_ERROR;
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151 }
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152 }
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153
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154 if (nevents < epcf->events) {
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155 if (event_list) {
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156 ngx_free(event_list);
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157 }
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158
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159 event_list = ngx_alloc(sizeof(struct epoll_event) * epcf->events,
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160 cycle->log);
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161 if (event_list == NULL) {
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162 return NGX_ERROR;
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163 }
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164 }
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165
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166 nevents = epcf->events;
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167
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168 ngx_io = ngx_os_io;
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169
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170 ngx_event_actions = ngx_epoll_module_ctx.actions;
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171
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18
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172 #if (NGX_HAVE_CLEAR_EVENT)
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0
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173 ngx_event_flags = NGX_USE_CLEAR_EVENT
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174 #else
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175 ngx_event_flags = NGX_USE_LEVEL_EVENT
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176 #endif
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4
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177 |NGX_USE_GREEDY_EVENT
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0
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178 |NGX_USE_EPOLL_EVENT;
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179
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180 return NGX_OK;
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181 }
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182
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183
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48
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184 static void
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185 ngx_epoll_done(ngx_cycle_t *cycle)
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0
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186 {
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187 if (close(ep) == -1) {
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188 ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
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189 "epoll close() failed");
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190 }
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191
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192 ep = -1;
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193
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194 ngx_free(event_list);
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195
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196 event_list = NULL;
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197 nevents = 0;
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198 }
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199
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200
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48
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201 static ngx_int_t
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202 ngx_epoll_add_event(ngx_event_t *ev, int event, u_int flags)
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0
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203 {
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32
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204 int op;
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205 uint32_t events, prev;
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0
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206 ngx_event_t *e;
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207 ngx_connection_t *c;
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208 struct epoll_event ee;
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209
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210 c = ev->data;
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211
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32
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212 events = (uint32_t) event;
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213
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0
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214 if (event == NGX_READ_EVENT) {
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215 e = c->write;
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216 prev = EPOLLOUT;
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217 #if (NGX_READ_EVENT != EPOLLIN)
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32
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218 events = EPOLLIN;
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0
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219 #endif
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220
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221 } else {
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222 e = c->read;
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223 prev = EPOLLIN;
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224 #if (NGX_WRITE_EVENT != EPOLLOUT)
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32
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225 events = EPOLLOUT;
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0
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226 #endif
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227 }
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228
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229 if (e->active) {
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230 op = EPOLL_CTL_MOD;
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32
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231 events |= prev;
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0
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232
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233 } else {
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234 op = EPOLL_CTL_ADD;
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235 }
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236
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32
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237 ee.events = events | flags;
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30
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238 ee.data.u64 = (uintptr_t) c | ev->instance;
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0
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239
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240 ngx_log_debug3(NGX_LOG_DEBUG_EVENT, ev->log, 0,
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10
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241 "epoll add event: fd:%d op:%d ev:%08XD",
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0
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242 c->fd, op, ee.events);
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243
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244 if (epoll_ctl(ep, op, c->fd, &ee) == -1) {
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245 ngx_log_error(NGX_LOG_ALERT, ev->log, ngx_errno,
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246 "epoll_ctl(%d, %d) failed", op, c->fd);
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247 return NGX_ERROR;
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248 }
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249
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250 ev->active = 1;
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251 #if 0
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252 ev->oneshot = (flags & NGX_ONESHOT_EVENT) ? 1 : 0;
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253 #endif
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254
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255 return NGX_OK;
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256 }
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257
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258
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48
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259 static ngx_int_t
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260 ngx_epoll_del_event(ngx_event_t *ev, int event, u_int flags)
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0
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261 {
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32
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262 int op;
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263 uint32_t prev;
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0
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264 ngx_event_t *e;
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265 ngx_connection_t *c;
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266 struct epoll_event ee;
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267
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268 /*
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32
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269 * when the file descriptor is closed, the epoll automatically deletes
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270 * it from its queue, so we do not need to delete explicity the event
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0
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271 * before the closing the file descriptor
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272 */
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273
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274 if (flags & NGX_CLOSE_EVENT) {
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275 ev->active = 0;
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276 return NGX_OK;
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277 }
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278
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279 c = ev->data;
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280
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281 if (event == NGX_READ_EVENT) {
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282 e = c->write;
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283 prev = EPOLLOUT;
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284
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285 } else {
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286 e = c->read;
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287 prev = EPOLLIN;
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288 }
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289
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290 if (e->active) {
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291 op = EPOLL_CTL_MOD;
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292 ee.events = prev | flags;
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30
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293 ee.data.u64 = (uintptr_t) c | ev->instance;
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0
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294
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295 } else {
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296 op = EPOLL_CTL_DEL;
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297 ee.events = 0;
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298 ee.data.ptr = NULL;
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299 }
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300
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301 ngx_log_debug3(NGX_LOG_DEBUG_EVENT, ev->log, 0,
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10
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302 "epoll del event: fd:%d op:%d ev:%08XD",
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0
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303 c->fd, op, ee.events);
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304
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305 if (epoll_ctl(ep, op, c->fd, &ee) == -1) {
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306 ngx_log_error(NGX_LOG_ALERT, ev->log, ngx_errno,
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307 "epoll_ctl(%d, %d) failed", op, c->fd);
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308 return NGX_ERROR;
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309 }
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310
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311 ev->active = 0;
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312
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313 return NGX_OK;
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314 }
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315
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316
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48
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317 static ngx_int_t
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318 ngx_epoll_add_connection(ngx_connection_t *c)
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0
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319 {
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320 struct epoll_event ee;
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321
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322 ee.events = EPOLLIN|EPOLLOUT|EPOLLET;
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30
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323 ee.data.u64 = (uintptr_t) c | c->read->instance;
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0
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324
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325 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, c->log, 0,
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10
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326 "epoll add connection: fd:%d ev:%08XD", c->fd, ee.events);
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0
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327
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328 if (epoll_ctl(ep, EPOLL_CTL_ADD, c->fd, &ee) == -1) {
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329 ngx_log_error(NGX_LOG_ALERT, c->log, ngx_errno,
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330 "epoll_ctl(EPOLL_CTL_ADD, %d) failed", c->fd);
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331 return NGX_ERROR;
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332 }
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333
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334 c->read->active = 1;
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335 c->write->active = 1;
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336
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337 return NGX_OK;
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338 }
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339
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340
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48
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341 static ngx_int_t
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342 ngx_epoll_del_connection(ngx_connection_t *c, u_int flags)
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0
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343 {
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344 int op;
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345 struct epoll_event ee;
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346
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347 /*
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348 * when the file descriptor is closed the epoll automatically deletes
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349 * it from its queue so we do not need to delete explicity the event
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350 * before the closing the file descriptor
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351 */
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352
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353 if (flags & NGX_CLOSE_EVENT) {
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354 c->read->active = 0;
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355 c->write->active = 0;
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356 return NGX_OK;
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357 }
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358
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359 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, 0,
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360 "epoll del connection: fd:%d", c->fd);
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361
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362 op = EPOLL_CTL_DEL;
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363 ee.events = 0;
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30
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364 ee.data.u64 = 0;
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0
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365
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366 if (epoll_ctl(ep, op, c->fd, &ee) == -1) {
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367 ngx_log_error(NGX_LOG_ALERT, c->log, ngx_errno,
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368 "epoll_ctl(%d, %d) failed", op, c->fd);
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369 return NGX_ERROR;
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370 }
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371
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372 c->read->active = 0;
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373 c->write->active = 0;
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374
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375 return NGX_OK;
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376 }
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377
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378
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48
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379 static ngx_int_t
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380 ngx_epoll_process_events(ngx_cycle_t *cycle)
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0
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381 {
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382 int events;
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383 size_t n;
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32
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384 uint32_t revents;
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0
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385 ngx_int_t instance, i;
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386 ngx_uint_t lock, accept_lock, expire;
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387 ngx_err_t err;
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388 ngx_log_t *log;
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389 ngx_msec_t timer;
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390 ngx_event_t *rev, *wev;
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391 struct timeval tv;
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392 ngx_connection_t *c;
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393 ngx_epoch_msec_t delta;
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394
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395 for ( ;; ) {
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396 timer = ngx_event_find_timer();
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397
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398 #if (NGX_THREADS)
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399
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400 if (timer == NGX_TIMER_ERROR) {
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401 return NGX_ERROR;
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402 }
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403
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404 if (timer == NGX_TIMER_INFINITE || timer > 500) {
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405 timer = 500;
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406 break;
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407 }
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408
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409 #endif
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410
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411 if (timer != 0) {
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412 break;
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413 }
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414
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415 ngx_log_debug0(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
|
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416 "epoll expired timer");
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417
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418 ngx_event_expire_timers((ngx_msec_t)
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419 (ngx_elapsed_msec - ngx_old_elapsed_msec));
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420
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421 if (ngx_posted_events && ngx_threaded) {
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422 ngx_wakeup_worker_thread(cycle);
|
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423 }
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424 }
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425
|
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426 /* NGX_TIMER_INFINITE == INFTIM */
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427
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428 if (timer == NGX_TIMER_INFINITE) {
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429 expire = 0;
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430
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431 } else {
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432 expire = 1;
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433 }
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434
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435 ngx_old_elapsed_msec = ngx_elapsed_msec;
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436 accept_lock = 0;
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437
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438 if (ngx_accept_mutex) {
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439 if (ngx_accept_disabled > 0) {
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440 ngx_accept_disabled--;
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441
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442 } else {
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443 if (ngx_trylock_accept_mutex(cycle) == NGX_ERROR) {
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444 return NGX_ERROR;
|
|
445 }
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446
|
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447 if (ngx_accept_mutex_held) {
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448 accept_lock = 1;
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449
|
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450 } else if (timer == NGX_TIMER_INFINITE
|
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451 || timer > ngx_accept_mutex_delay)
|
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452 {
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453 timer = ngx_accept_mutex_delay;
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454 expire = 0;
|
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455 }
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456 }
|
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457 }
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458
|
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459 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
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460 "epoll timer: %d", timer);
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461
|
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462 events = epoll_wait(ep, event_list, nevents, timer);
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463
|
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464 if (events == -1) {
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465 err = ngx_errno;
|
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466 } else {
|
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467 err = 0;
|
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468 }
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469
|
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470 ngx_gettimeofday(&tv);
|
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471 ngx_time_update(tv.tv_sec);
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472
|
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473 delta = ngx_elapsed_msec;
|
|
474 ngx_elapsed_msec = (ngx_epoch_msec_t) tv.tv_sec * 1000
|
|
475 + tv.tv_usec / 1000 - ngx_start_msec;
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476
|
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477 if (timer != NGX_TIMER_INFINITE) {
|
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478 delta = ngx_elapsed_msec - delta;
|
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479
|
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480 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
|
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481 "epoll timer: %d, delta: %d", timer, (int) delta);
|
|
482 } else {
|
|
483 if (events == 0) {
|
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484 ngx_log_error(NGX_LOG_ALERT, cycle->log, 0,
|
|
485 "epoll_wait() returned no events without timeout");
|
|
486 ngx_accept_mutex_unlock();
|
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487 return NGX_ERROR;
|
|
488 }
|
|
489 }
|
|
490
|
|
491 if (err) {
|
|
492 ngx_log_error((err == NGX_EINTR) ? NGX_LOG_INFO : NGX_LOG_ALERT,
|
|
493 cycle->log, err, "epoll_wait() failed");
|
|
494 ngx_accept_mutex_unlock();
|
|
495 return NGX_ERROR;
|
|
496 }
|
|
497
|
|
498 if (events > 0) {
|
|
499 if (ngx_mutex_lock(ngx_posted_events_mutex) == NGX_ERROR) {
|
|
500 ngx_accept_mutex_unlock();
|
|
501 return NGX_ERROR;
|
|
502 }
|
|
503
|
|
504 lock = 1;
|
|
505
|
|
506 } else {
|
|
507 lock =0;
|
|
508 }
|
|
509
|
|
510 log = cycle->log;
|
|
511
|
|
512 for (i = 0; i < events; i++) {
|
|
513 c = event_list[i].data.ptr;
|
|
514
|
|
515 instance = (uintptr_t) c & 1;
|
|
516 c = (ngx_connection_t *) ((uintptr_t) c & (uintptr_t) ~1);
|
|
517
|
|
518 rev = c->read;
|
|
519
|
|
520 if (c->fd == -1 || rev->instance != instance) {
|
|
521
|
|
522 /*
|
|
523 * the stale event from a file descriptor
|
|
524 * that was just closed in this iteration
|
|
525 */
|
|
526
|
|
527 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
|
10
|
528 "epoll: stale event %p", c);
|
0
|
529 continue;
|
|
530 }
|
|
531
|
|
532 #if (NGX_DEBUG0)
|
|
533 log = c->log ? c->log : cycle->log;
|
|
534 #endif
|
|
535
|
32
|
536 revents = event_list[i].events;
|
|
537
|
0
|
538 ngx_log_debug3(NGX_LOG_DEBUG_EVENT, log, 0,
|
10
|
539 "epoll: fd:%d ev:%04XD d:%p",
|
32
|
540 c->fd, revents, event_list[i].data);
|
0
|
541
|
32
|
542 if (revents & (EPOLLERR|EPOLLHUP)) {
|
0
|
543 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, log, 0,
|
10
|
544 "epoll_wait() error on fd:%d ev:%04XD",
|
32
|
545 c->fd, revents);
|
|
546 }
|
|
547
|
|
548 if (revents & ~(EPOLLIN|EPOLLOUT|EPOLLERR|EPOLLHUP)) {
|
|
549 ngx_log_error(NGX_LOG_ALERT, log, 0,
|
|
550 "strange epoll_wait() events fd:%d ev:%04XD",
|
|
551 c->fd, revents);
|
0
|
552 }
|
|
553
|
32
|
554 if ((revents & (EPOLLERR|EPOLLHUP))
|
|
555 && (revents & (EPOLLIN|EPOLLOUT)) == 0)
|
|
556 {
|
|
557 /*
|
|
558 * if the error events were returned without EPOLLIN or EPOLLOUT,
|
|
559 * then add these flags to handle the events at least in one
|
|
560 * active handler
|
|
561 */
|
|
562
|
|
563 revents |= EPOLLIN|EPOLLOUT;
|
0
|
564 }
|
|
565
|
|
566 wev = c->write;
|
|
567
|
32
|
568 if ((revents & EPOLLOUT) && wev->active) {
|
|
569
|
0
|
570 if (ngx_threaded) {
|
|
571 wev->posted_ready = 1;
|
|
572 ngx_post_event(wev);
|
|
573
|
|
574 } else {
|
|
575 wev->ready = 1;
|
|
576
|
|
577 if (!ngx_accept_mutex_held) {
|
|
578 wev->event_handler(wev);
|
|
579
|
|
580 } else {
|
|
581 ngx_post_event(wev);
|
|
582 }
|
|
583 }
|
|
584 }
|
|
585
|
|
586 /*
|
|
587 * EPOLLIN must be handled after EPOLLOUT because we use
|
|
588 * the optimization to avoid the unnecessary mutex locking/unlocking
|
|
589 * if the accept event is the last one.
|
|
590 */
|
|
591
|
32
|
592 if ((revents & EPOLLIN) && rev->active) {
|
|
593
|
0
|
594 if (ngx_threaded && !rev->accept) {
|
|
595 rev->posted_ready = 1;
|
|
596
|
|
597 ngx_post_event(rev);
|
|
598
|
|
599 continue;
|
|
600 }
|
|
601
|
|
602 rev->ready = 1;
|
|
603
|
|
604 if (!ngx_threaded && !ngx_accept_mutex_held) {
|
|
605 rev->event_handler(rev);
|
|
606
|
|
607 } else if (!rev->accept) {
|
|
608 ngx_post_event(rev);
|
|
609
|
|
610 } else if (ngx_accept_disabled <= 0) {
|
|
611
|
|
612 ngx_mutex_unlock(ngx_posted_events_mutex);
|
|
613
|
|
614 rev->event_handler(rev);
|
|
615
|
|
616 if (ngx_accept_disabled > 0) {
|
|
617 ngx_accept_mutex_unlock();
|
|
618 accept_lock = 0;
|
|
619 }
|
|
620
|
|
621 if (i + 1 == events) {
|
|
622 lock = 0;
|
|
623 break;
|
|
624 }
|
|
625
|
|
626 if (ngx_mutex_lock(ngx_posted_events_mutex) == NGX_ERROR) {
|
|
627 if (accept_lock) {
|
|
628 ngx_accept_mutex_unlock();
|
|
629 }
|
|
630 return NGX_ERROR;
|
|
631 }
|
|
632 }
|
|
633 }
|
|
634 }
|
|
635
|
|
636 if (accept_lock) {
|
|
637 ngx_accept_mutex_unlock();
|
|
638 }
|
|
639
|
|
640 if (lock) {
|
|
641 ngx_mutex_unlock(ngx_posted_events_mutex);
|
|
642 }
|
|
643
|
|
644 if (expire && delta) {
|
|
645 ngx_event_expire_timers((ngx_msec_t) delta);
|
|
646 }
|
|
647
|
|
648 if (ngx_posted_events) {
|
|
649 if (ngx_threaded) {
|
|
650 ngx_wakeup_worker_thread(cycle);
|
|
651
|
|
652 } else {
|
|
653 ngx_event_process_posted(cycle);
|
|
654 }
|
|
655 }
|
|
656
|
|
657 return NGX_OK;
|
|
658 }
|
|
659
|
|
660
|
48
|
661 static void *
|
|
662 ngx_epoll_create_conf(ngx_cycle_t *cycle)
|
0
|
663 {
|
|
664 ngx_epoll_conf_t *epcf;
|
|
665
|
|
666 ngx_test_null(epcf, ngx_palloc(cycle->pool, sizeof(ngx_epoll_conf_t)),
|
|
667 NGX_CONF_ERROR);
|
|
668
|
|
669 epcf->events = NGX_CONF_UNSET;
|
|
670
|
|
671 return epcf;
|
|
672 }
|
|
673
|
|
674
|
48
|
675 static char *
|
|
676 ngx_epoll_init_conf(ngx_cycle_t *cycle, void *conf)
|
0
|
677 {
|
|
678 ngx_epoll_conf_t *epcf = conf;
|
|
679
|
|
680 ngx_conf_init_unsigned_value(epcf->events, 512);
|
|
681
|
|
682 return NGX_CONF_OK;
|
|
683 }
|