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 ngx_event_conf_t *ecf;
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137 ngx_epoll_conf_t *epcf;
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138
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139 ecf = ngx_event_get_conf(cycle->conf_ctx, ngx_event_core_module);
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140
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141 epcf = ngx_event_get_conf(cycle->conf_ctx, ngx_epoll_module);
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142
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143 if (ep == -1) {
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144 ep = epoll_create(ecf->connections / 2);
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145
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146 if (ep == -1) {
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147 ngx_log_error(NGX_LOG_EMERG, cycle->log, ngx_errno,
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148 "epoll_create() failed");
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149 return NGX_ERROR;
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150 }
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151 }
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152
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153 if (nevents < epcf->events) {
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154 if (event_list) {
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155 ngx_free(event_list);
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156 }
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157
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158 event_list = ngx_alloc(sizeof(struct epoll_event) * epcf->events,
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159 cycle->log);
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160 if (event_list == NULL) {
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161 return NGX_ERROR;
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162 }
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163 }
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164
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165 nevents = epcf->events;
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166
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167 ngx_io = ngx_os_io;
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168
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169 ngx_event_actions = ngx_epoll_module_ctx.actions;
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170
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18
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171 #if (NGX_HAVE_CLEAR_EVENT)
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0
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172 ngx_event_flags = NGX_USE_CLEAR_EVENT
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173 #else
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174 ngx_event_flags = NGX_USE_LEVEL_EVENT
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175 #endif
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4
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176 |NGX_USE_GREEDY_EVENT
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0
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177 |NGX_USE_EPOLL_EVENT;
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178
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179 return NGX_OK;
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180 }
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181
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182
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48
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183 static void
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184 ngx_epoll_done(ngx_cycle_t *cycle)
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0
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185 {
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186 if (close(ep) == -1) {
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187 ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
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188 "epoll close() failed");
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189 }
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190
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191 ep = -1;
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192
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193 ngx_free(event_list);
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194
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195 event_list = NULL;
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196 nevents = 0;
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197 }
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198
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199
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48
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200 static ngx_int_t
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201 ngx_epoll_add_event(ngx_event_t *ev, int event, u_int flags)
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0
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202 {
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32
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203 int op;
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204 uint32_t events, prev;
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0
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205 ngx_event_t *e;
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206 ngx_connection_t *c;
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207 struct epoll_event ee;
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208
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209 c = ev->data;
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210
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32
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211 events = (uint32_t) event;
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212
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0
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213 if (event == NGX_READ_EVENT) {
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214 e = c->write;
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215 prev = EPOLLOUT;
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216 #if (NGX_READ_EVENT != EPOLLIN)
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32
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217 events = EPOLLIN;
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0
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218 #endif
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219
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220 } else {
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221 e = c->read;
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222 prev = EPOLLIN;
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223 #if (NGX_WRITE_EVENT != EPOLLOUT)
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32
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224 events = EPOLLOUT;
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0
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225 #endif
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226 }
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227
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228 if (e->active) {
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229 op = EPOLL_CTL_MOD;
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32
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230 events |= prev;
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0
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231
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232 } else {
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233 op = EPOLL_CTL_ADD;
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234 }
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235
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32
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236 ee.events = events | flags;
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30
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237 ee.data.u64 = (uintptr_t) c | ev->instance;
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0
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238
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239 ngx_log_debug3(NGX_LOG_DEBUG_EVENT, ev->log, 0,
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10
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240 "epoll add event: fd:%d op:%d ev:%08XD",
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0
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241 c->fd, op, ee.events);
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242
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243 if (epoll_ctl(ep, op, c->fd, &ee) == -1) {
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244 ngx_log_error(NGX_LOG_ALERT, ev->log, ngx_errno,
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245 "epoll_ctl(%d, %d) failed", op, c->fd);
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246 return NGX_ERROR;
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247 }
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248
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249 ev->active = 1;
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250 #if 0
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251 ev->oneshot = (flags & NGX_ONESHOT_EVENT) ? 1 : 0;
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252 #endif
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253
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254 return NGX_OK;
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255 }
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256
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257
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48
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258 static ngx_int_t
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259 ngx_epoll_del_event(ngx_event_t *ev, int event, u_int flags)
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0
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260 {
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32
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261 int op;
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262 uint32_t prev;
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0
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263 ngx_event_t *e;
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264 ngx_connection_t *c;
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265 struct epoll_event ee;
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266
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267 /*
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32
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268 * when the file descriptor is closed, the epoll automatically deletes
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269 * it from its queue, so we do not need to delete explicity the event
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0
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270 * before the closing the file descriptor
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271 */
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272
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273 if (flags & NGX_CLOSE_EVENT) {
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274 ev->active = 0;
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275 return NGX_OK;
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276 }
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277
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278 c = ev->data;
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279
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280 if (event == NGX_READ_EVENT) {
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281 e = c->write;
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282 prev = EPOLLOUT;
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283
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284 } else {
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285 e = c->read;
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286 prev = EPOLLIN;
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287 }
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288
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289 if (e->active) {
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290 op = EPOLL_CTL_MOD;
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291 ee.events = prev | flags;
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30
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292 ee.data.u64 = (uintptr_t) c | ev->instance;
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0
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293
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294 } else {
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295 op = EPOLL_CTL_DEL;
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296 ee.events = 0;
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297 ee.data.ptr = NULL;
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298 }
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299
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300 ngx_log_debug3(NGX_LOG_DEBUG_EVENT, ev->log, 0,
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10
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301 "epoll del event: fd:%d op:%d ev:%08XD",
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0
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302 c->fd, op, ee.events);
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303
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304 if (epoll_ctl(ep, op, c->fd, &ee) == -1) {
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305 ngx_log_error(NGX_LOG_ALERT, ev->log, ngx_errno,
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306 "epoll_ctl(%d, %d) failed", op, c->fd);
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307 return NGX_ERROR;
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308 }
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309
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310 ev->active = 0;
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311
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312 return NGX_OK;
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313 }
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314
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315
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48
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316 static ngx_int_t
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317 ngx_epoll_add_connection(ngx_connection_t *c)
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0
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318 {
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319 struct epoll_event ee;
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320
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321 ee.events = EPOLLIN|EPOLLOUT|EPOLLET;
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30
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322 ee.data.u64 = (uintptr_t) c | c->read->instance;
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0
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323
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324 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, c->log, 0,
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10
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325 "epoll add connection: fd:%d ev:%08XD", c->fd, ee.events);
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0
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326
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327 if (epoll_ctl(ep, EPOLL_CTL_ADD, c->fd, &ee) == -1) {
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328 ngx_log_error(NGX_LOG_ALERT, c->log, ngx_errno,
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329 "epoll_ctl(EPOLL_CTL_ADD, %d) failed", c->fd);
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330 return NGX_ERROR;
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331 }
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332
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333 c->read->active = 1;
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334 c->write->active = 1;
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335
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336 return NGX_OK;
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337 }
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338
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339
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48
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340 static ngx_int_t
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341 ngx_epoll_del_connection(ngx_connection_t *c, u_int flags)
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0
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342 {
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343 int op;
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344 struct epoll_event ee;
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345
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346 /*
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347 * when the file descriptor is closed the epoll automatically deletes
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348 * it from its queue so we do not need to delete explicity the event
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349 * before the closing the file descriptor
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350 */
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351
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352 if (flags & NGX_CLOSE_EVENT) {
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353 c->read->active = 0;
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354 c->write->active = 0;
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355 return NGX_OK;
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356 }
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357
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358 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, 0,
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359 "epoll del connection: fd:%d", c->fd);
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360
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361 op = EPOLL_CTL_DEL;
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362 ee.events = 0;
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30
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363 ee.data.u64 = 0;
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0
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364
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365 if (epoll_ctl(ep, op, c->fd, &ee) == -1) {
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366 ngx_log_error(NGX_LOG_ALERT, c->log, ngx_errno,
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367 "epoll_ctl(%d, %d) failed", op, c->fd);
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368 return NGX_ERROR;
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369 }
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370
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371 c->read->active = 0;
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372 c->write->active = 0;
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373
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374 return NGX_OK;
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375 }
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376
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377
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48
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378 static ngx_int_t
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379 ngx_epoll_process_events(ngx_cycle_t *cycle)
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0
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380 {
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381 int events;
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32
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382 uint32_t revents;
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0
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383 ngx_int_t instance, i;
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384 ngx_uint_t lock, accept_lock, expire;
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385 ngx_err_t err;
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386 ngx_log_t *log;
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387 ngx_msec_t timer;
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388 ngx_event_t *rev, *wev;
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389 struct timeval tv;
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390 ngx_connection_t *c;
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391 ngx_epoch_msec_t delta;
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392
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393 for ( ;; ) {
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394 timer = ngx_event_find_timer();
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395
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396 #if (NGX_THREADS)
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397
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398 if (timer == NGX_TIMER_ERROR) {
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399 return NGX_ERROR;
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400 }
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401
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402 if (timer == NGX_TIMER_INFINITE || timer > 500) {
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403 timer = 500;
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404 break;
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405 }
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406
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407 #endif
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408
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409 if (timer != 0) {
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410 break;
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411 }
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412
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413 ngx_log_debug0(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
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414 "epoll expired timer");
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415
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416 ngx_event_expire_timers((ngx_msec_t)
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417 (ngx_elapsed_msec - ngx_old_elapsed_msec));
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418
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419 if (ngx_posted_events && ngx_threaded) {
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420 ngx_wakeup_worker_thread(cycle);
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421 }
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422 }
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423
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424 /* NGX_TIMER_INFINITE == INFTIM */
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425
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426 if (timer == NGX_TIMER_INFINITE) {
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427 expire = 0;
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428
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429 } else {
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430 expire = 1;
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431 }
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432
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433 ngx_old_elapsed_msec = ngx_elapsed_msec;
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434 accept_lock = 0;
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435
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436 if (ngx_accept_mutex) {
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437 if (ngx_accept_disabled > 0) {
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438 ngx_accept_disabled--;
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439
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440 } else {
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441 if (ngx_trylock_accept_mutex(cycle) == NGX_ERROR) {
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442 return NGX_ERROR;
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443 }
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444
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445 if (ngx_accept_mutex_held) {
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446 accept_lock = 1;
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447
|
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448 } else if (timer == NGX_TIMER_INFINITE
|
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449 || timer > ngx_accept_mutex_delay)
|
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450 {
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451 timer = ngx_accept_mutex_delay;
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452 expire = 0;
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453 }
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454 }
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455 }
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456
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457 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
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458 "epoll timer: %d", timer);
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459
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460 events = epoll_wait(ep, event_list, nevents, timer);
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461
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462 if (events == -1) {
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463 err = ngx_errno;
|
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464 } else {
|
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465 err = 0;
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466 }
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467
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468 ngx_gettimeofday(&tv);
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469 ngx_time_update(tv.tv_sec);
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470
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471 delta = ngx_elapsed_msec;
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472 ngx_elapsed_msec = (ngx_epoch_msec_t) tv.tv_sec * 1000
|
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473 + tv.tv_usec / 1000 - ngx_start_msec;
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474
|
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475 if (timer != NGX_TIMER_INFINITE) {
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476 delta = ngx_elapsed_msec - delta;
|
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477
|
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478 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
|
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479 "epoll timer: %d, delta: %d", timer, (int) delta);
|
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480 } else {
|
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481 if (events == 0) {
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482 ngx_log_error(NGX_LOG_ALERT, cycle->log, 0,
|
|
483 "epoll_wait() returned no events without timeout");
|
|
484 ngx_accept_mutex_unlock();
|
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485 return NGX_ERROR;
|
|
486 }
|
|
487 }
|
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488
|
|
489 if (err) {
|
|
490 ngx_log_error((err == NGX_EINTR) ? NGX_LOG_INFO : NGX_LOG_ALERT,
|
|
491 cycle->log, err, "epoll_wait() failed");
|
|
492 ngx_accept_mutex_unlock();
|
|
493 return NGX_ERROR;
|
|
494 }
|
|
495
|
|
496 if (events > 0) {
|
|
497 if (ngx_mutex_lock(ngx_posted_events_mutex) == NGX_ERROR) {
|
|
498 ngx_accept_mutex_unlock();
|
|
499 return NGX_ERROR;
|
|
500 }
|
|
501
|
|
502 lock = 1;
|
|
503
|
|
504 } else {
|
|
505 lock =0;
|
|
506 }
|
|
507
|
|
508 log = cycle->log;
|
|
509
|
|
510 for (i = 0; i < events; i++) {
|
|
511 c = event_list[i].data.ptr;
|
|
512
|
|
513 instance = (uintptr_t) c & 1;
|
|
514 c = (ngx_connection_t *) ((uintptr_t) c & (uintptr_t) ~1);
|
|
515
|
|
516 rev = c->read;
|
|
517
|
|
518 if (c->fd == -1 || rev->instance != instance) {
|
|
519
|
|
520 /*
|
|
521 * the stale event from a file descriptor
|
|
522 * that was just closed in this iteration
|
|
523 */
|
|
524
|
|
525 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
|
10
|
526 "epoll: stale event %p", c);
|
0
|
527 continue;
|
|
528 }
|
|
529
|
|
530 #if (NGX_DEBUG0)
|
|
531 log = c->log ? c->log : cycle->log;
|
|
532 #endif
|
|
533
|
32
|
534 revents = event_list[i].events;
|
|
535
|
0
|
536 ngx_log_debug3(NGX_LOG_DEBUG_EVENT, log, 0,
|
10
|
537 "epoll: fd:%d ev:%04XD d:%p",
|
32
|
538 c->fd, revents, event_list[i].data);
|
0
|
539
|
32
|
540 if (revents & (EPOLLERR|EPOLLHUP)) {
|
0
|
541 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, log, 0,
|
10
|
542 "epoll_wait() error on fd:%d ev:%04XD",
|
32
|
543 c->fd, revents);
|
|
544 }
|
|
545
|
|
546 if (revents & ~(EPOLLIN|EPOLLOUT|EPOLLERR|EPOLLHUP)) {
|
|
547 ngx_log_error(NGX_LOG_ALERT, log, 0,
|
|
548 "strange epoll_wait() events fd:%d ev:%04XD",
|
|
549 c->fd, revents);
|
0
|
550 }
|
|
551
|
32
|
552 if ((revents & (EPOLLERR|EPOLLHUP))
|
|
553 && (revents & (EPOLLIN|EPOLLOUT)) == 0)
|
|
554 {
|
|
555 /*
|
|
556 * if the error events were returned without EPOLLIN or EPOLLOUT,
|
|
557 * then add these flags to handle the events at least in one
|
|
558 * active handler
|
|
559 */
|
|
560
|
|
561 revents |= EPOLLIN|EPOLLOUT;
|
0
|
562 }
|
|
563
|
|
564 wev = c->write;
|
|
565
|
32
|
566 if ((revents & EPOLLOUT) && wev->active) {
|
|
567
|
0
|
568 if (ngx_threaded) {
|
|
569 wev->posted_ready = 1;
|
|
570 ngx_post_event(wev);
|
|
571
|
|
572 } else {
|
|
573 wev->ready = 1;
|
|
574
|
|
575 if (!ngx_accept_mutex_held) {
|
|
576 wev->event_handler(wev);
|
|
577
|
|
578 } else {
|
|
579 ngx_post_event(wev);
|
|
580 }
|
|
581 }
|
|
582 }
|
|
583
|
|
584 /*
|
|
585 * EPOLLIN must be handled after EPOLLOUT because we use
|
|
586 * the optimization to avoid the unnecessary mutex locking/unlocking
|
|
587 * if the accept event is the last one.
|
|
588 */
|
|
589
|
32
|
590 if ((revents & EPOLLIN) && rev->active) {
|
|
591
|
0
|
592 if (ngx_threaded && !rev->accept) {
|
|
593 rev->posted_ready = 1;
|
|
594
|
|
595 ngx_post_event(rev);
|
|
596
|
|
597 continue;
|
|
598 }
|
|
599
|
|
600 rev->ready = 1;
|
|
601
|
|
602 if (!ngx_threaded && !ngx_accept_mutex_held) {
|
|
603 rev->event_handler(rev);
|
|
604
|
|
605 } else if (!rev->accept) {
|
|
606 ngx_post_event(rev);
|
|
607
|
|
608 } else if (ngx_accept_disabled <= 0) {
|
|
609
|
|
610 ngx_mutex_unlock(ngx_posted_events_mutex);
|
|
611
|
|
612 rev->event_handler(rev);
|
|
613
|
|
614 if (ngx_accept_disabled > 0) {
|
|
615 ngx_accept_mutex_unlock();
|
|
616 accept_lock = 0;
|
|
617 }
|
|
618
|
|
619 if (i + 1 == events) {
|
|
620 lock = 0;
|
|
621 break;
|
|
622 }
|
|
623
|
|
624 if (ngx_mutex_lock(ngx_posted_events_mutex) == NGX_ERROR) {
|
|
625 if (accept_lock) {
|
|
626 ngx_accept_mutex_unlock();
|
|
627 }
|
|
628 return NGX_ERROR;
|
|
629 }
|
|
630 }
|
|
631 }
|
|
632 }
|
|
633
|
|
634 if (accept_lock) {
|
|
635 ngx_accept_mutex_unlock();
|
|
636 }
|
|
637
|
|
638 if (lock) {
|
|
639 ngx_mutex_unlock(ngx_posted_events_mutex);
|
|
640 }
|
|
641
|
|
642 if (expire && delta) {
|
|
643 ngx_event_expire_timers((ngx_msec_t) delta);
|
|
644 }
|
|
645
|
|
646 if (ngx_posted_events) {
|
|
647 if (ngx_threaded) {
|
|
648 ngx_wakeup_worker_thread(cycle);
|
|
649
|
|
650 } else {
|
|
651 ngx_event_process_posted(cycle);
|
|
652 }
|
|
653 }
|
|
654
|
|
655 return NGX_OK;
|
|
656 }
|
|
657
|
|
658
|
48
|
659 static void *
|
|
660 ngx_epoll_create_conf(ngx_cycle_t *cycle)
|
0
|
661 {
|
|
662 ngx_epoll_conf_t *epcf;
|
|
663
|
50
|
664 epcf = ngx_palloc(cycle->pool, sizeof(ngx_epoll_conf_t));
|
|
665 if (epcf == NULL) {
|
|
666 return NGX_CONF_ERROR;
|
|
667 }
|
0
|
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 }
|