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0
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1
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2 /*
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3 * Copyright (C) Igor Sysoev
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4 */
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5
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6
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7 #include <ngx_config.h>
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8 #include <ngx_core.h>
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9 #include <ngx_event.h>
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10
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11
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12
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112
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13 static ngx_int_t ngx_select_init(ngx_cycle_t *cycle, ngx_msec_t timer);
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0
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14 static void ngx_select_done(ngx_cycle_t *cycle);
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324
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15 static ngx_int_t ngx_select_add_event(ngx_event_t *ev, ngx_int_t event,
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16 ngx_uint_t flags);
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17 static ngx_int_t ngx_select_del_event(ngx_event_t *ev, ngx_int_t event,
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18 ngx_uint_t flags);
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112
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19 static ngx_int_t ngx_select_process_events(ngx_cycle_t *cycle, ngx_msec_t timer,
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20 ngx_uint_t flags);
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484
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21 static void ngx_select_repair_fd_sets(ngx_cycle_t *cycle);
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0
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22 static char *ngx_select_init_conf(ngx_cycle_t *cycle, void *conf);
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23
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24
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25 static fd_set master_read_fd_set;
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26 static fd_set master_write_fd_set;
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27 static fd_set work_read_fd_set;
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28 static fd_set work_write_fd_set;
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29
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10
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30 #if (NGX_WIN32)
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324
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31 static ngx_uint_t max_read;
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32 static ngx_uint_t max_write;
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0
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33 #else
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324
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34 static ngx_int_t max_fd;
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0
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35 #endif
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36
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37 static ngx_uint_t nevents;
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38
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39 static ngx_event_t **event_index;
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40
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41
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42 static ngx_str_t select_name = ngx_string("select");
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43
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44 ngx_event_module_t ngx_select_module_ctx = {
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45 &select_name,
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46 NULL, /* create configuration */
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47 ngx_select_init_conf, /* init configuration */
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48
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49 {
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50 ngx_select_add_event, /* add an event */
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51 ngx_select_del_event, /* delete an event */
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52 ngx_select_add_event, /* enable an event */
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53 ngx_select_del_event, /* disable an event */
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54 NULL, /* add an connection */
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55 NULL, /* delete an connection */
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56 NULL, /* process the changes */
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57 ngx_select_process_events, /* process the events */
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58 ngx_select_init, /* init the events */
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59 ngx_select_done /* done the events */
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60 }
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61
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62 };
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63
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64 ngx_module_t ngx_select_module = {
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58
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65 NGX_MODULE_V1,
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0
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66 &ngx_select_module_ctx, /* module context */
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67 NULL, /* module directives */
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68 NGX_EVENT_MODULE, /* module type */
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90
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69 NULL, /* init master */
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0
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70 NULL, /* init module */
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90
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71 NULL, /* init process */
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72 NULL, /* init thread */
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73 NULL, /* exit thread */
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74 NULL, /* exit process */
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75 NULL, /* exit master */
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76 NGX_MODULE_V1_PADDING
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0
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77 };
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78
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79
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50
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80 static ngx_int_t
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112
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81 ngx_select_init(ngx_cycle_t *cycle, ngx_msec_t timer)
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0
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82 {
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83 ngx_event_t **index;
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84
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85 if (event_index == NULL) {
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86 FD_ZERO(&master_read_fd_set);
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87 FD_ZERO(&master_write_fd_set);
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88 nevents = 0;
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89 }
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90
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91 if (ngx_process == NGX_PROCESS_WORKER
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92 || cycle->old_cycle == NULL
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93 || cycle->old_cycle->connection_n < cycle->connection_n)
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94 {
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50
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95 index = ngx_alloc(sizeof(ngx_event_t *) * 2 * cycle->connection_n,
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96 cycle->log);
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97 if (index == NULL) {
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98 return NGX_ERROR;
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99 }
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0
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100
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101 if (event_index) {
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102 ngx_memcpy(index, event_index, sizeof(ngx_event_t *) * nevents);
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103 ngx_free(event_index);
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104 }
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112
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105
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0
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106 event_index = index;
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107 }
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108
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109 ngx_io = ngx_os_io;
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110
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111 ngx_event_actions = ngx_select_module_ctx.actions;
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112
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112
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113 ngx_event_flags = NGX_USE_LEVEL_EVENT;
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0
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114
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10
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115 #if (NGX_WIN32)
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116 max_read = max_write = 0;
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117 #else
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118 max_fd = -1;
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119 #endif
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120
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121 return NGX_OK;
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122 }
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123
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124
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50
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125 static void
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126 ngx_select_done(ngx_cycle_t *cycle)
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0
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127 {
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128 ngx_free(event_index);
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129
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130 event_index = NULL;
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131 }
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132
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133
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50
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134 static ngx_int_t
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324
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135 ngx_select_add_event(ngx_event_t *ev, ngx_int_t event, ngx_uint_t flags)
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0
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136 {
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137 ngx_connection_t *c;
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138
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139 c = ev->data;
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140
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141 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, ev->log, 0,
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324
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142 "select add event fd:%d ev:%i", c->fd, event);
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0
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143
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144 if (ev->index != NGX_INVALID_INDEX) {
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145 ngx_log_error(NGX_LOG_ALERT, ev->log, 0,
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324
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146 "select event fd:%d ev:%i is already set", c->fd, event);
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0
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147 return NGX_OK;
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148 }
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149
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10
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150 #if (NGX_WIN32)
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151
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152 if ((event == NGX_READ_EVENT) && (max_read >= FD_SETSIZE)
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153 || (event == NGX_WRITE_EVENT) && (max_write >= FD_SETSIZE))
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154 {
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155 ngx_log_error(NGX_LOG_ERR, ev->log, 0,
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156 "maximum number of descriptors "
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157 "supported by select() is %d", FD_SETSIZE);
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158 return NGX_ERROR;
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159 }
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160
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161 if (event == NGX_READ_EVENT) {
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162 FD_SET(c->fd, &master_read_fd_set);
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163 max_read++;
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164
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165 } else if (event == NGX_WRITE_EVENT) {
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166 FD_SET(c->fd, &master_write_fd_set);
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167 max_write++;
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168 }
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169
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170 #else
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171
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172 if (event == NGX_READ_EVENT) {
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173 FD_SET(c->fd, &master_read_fd_set);
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174
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175 } else if (event == NGX_WRITE_EVENT) {
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176 FD_SET(c->fd, &master_write_fd_set);
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177 }
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178
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179 if (max_fd != -1 && max_fd < c->fd) {
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180 max_fd = c->fd;
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181 }
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182
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183 #endif
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184
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185 ev->active = 1;
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186
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187 event_index[nevents] = ev;
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188 ev->index = nevents;
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189 nevents++;
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190
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191 return NGX_OK;
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192 }
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193
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194
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50
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195 static ngx_int_t
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324
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196 ngx_select_del_event(ngx_event_t *ev, ngx_int_t event, ngx_uint_t flags)
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0
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197 {
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198 ngx_connection_t *c;
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199
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200 c = ev->data;
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201
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202 ev->active = 0;
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203
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204 if (ev->index == NGX_INVALID_INDEX) {
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205 return NGX_OK;
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206 }
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207
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208 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, ev->log, 0,
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324
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209 "select del event fd:%d ev:%i", c->fd, event);
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0
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210
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10
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211 #if (NGX_WIN32)
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212
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213 if (event == NGX_READ_EVENT) {
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214 FD_CLR(c->fd, &master_read_fd_set);
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215 max_read--;
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216
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217 } else if (event == NGX_WRITE_EVENT) {
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218 FD_CLR(c->fd, &master_write_fd_set);
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219 max_write--;
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220 }
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221
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222 #else
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223
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224 if (event == NGX_READ_EVENT) {
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225 FD_CLR(c->fd, &master_read_fd_set);
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226
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227 } else if (event == NGX_WRITE_EVENT) {
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228 FD_CLR(c->fd, &master_write_fd_set);
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229 }
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230
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231 if (max_fd == c->fd) {
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232 max_fd = -1;
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233 }
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234
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235 #endif
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236
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324
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237 if (ev->index < --nevents) {
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0
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238 event_index[ev->index] = event_index[nevents];
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239 event_index[ev->index]->index = ev->index;
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240 }
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241
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242 ev->index = NGX_INVALID_INDEX;
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243
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244 return NGX_OK;
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245 }
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246
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247
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50
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248 static ngx_int_t
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112
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249 ngx_select_process_events(ngx_cycle_t *cycle, ngx_msec_t timer,
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250 ngx_uint_t flags)
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0
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251 {
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484
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252 int ready, nready;
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253 ngx_err_t err;
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254 ngx_uint_t i, found;
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255 ngx_event_t *ev, **queue;
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256 struct timeval tv, *tp;
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257 ngx_connection_t *c;
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0
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258
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10
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259 #if !(NGX_WIN32)
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0
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260
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261 if (max_fd == -1) {
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262 for (i = 0; i < nevents; i++) {
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263 c = event_index[i]->data;
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264 if (max_fd < c->fd) {
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265 max_fd = c->fd;
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266 }
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267 }
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268
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269 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
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270 "change max_fd: %d", max_fd);
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271 }
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272
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273 #endif
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274
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275 #if (NGX_DEBUG)
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276 if (cycle->log->log_level & NGX_LOG_DEBUG_ALL) {
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277 for (i = 0; i < nevents; i++) {
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278 ev = event_index[i];
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279 c = ev->data;
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280 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
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281 "select event: fd:%d wr:%d", c->fd, ev->write);
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282 }
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283
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10
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284 #if !(NGX_WIN32)
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0
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285 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
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286 "max_fd: %d", max_fd);
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287 #endif
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288 }
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289 #endif
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290
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291 if (timer == NGX_TIMER_INFINITE) {
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292 tp = NULL;
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293
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294 } else {
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106
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295 tv.tv_sec = (long) (timer / 1000);
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296 tv.tv_usec = (long) ((timer % 1000) * 1000);
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0
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297 tp = &tv;
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298 }
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299
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300 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
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106
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301 "select timer: %M", timer);
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0
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302
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303 work_read_fd_set = master_read_fd_set;
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304 work_write_fd_set = master_write_fd_set;
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305
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10
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306 #if (NGX_WIN32)
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112
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307
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484
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308 if (max_read || max_write) {
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309 ready = select(0, &work_read_fd_set, &work_write_fd_set, NULL, tp);
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310
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311 } else {
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312
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313 /*
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314 * Winsock select() requires that at least one descriptor set must be
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315 * be non-null, and any non-null descriptor set must contain at least
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316 * one handle to a socket. Otherwise select() returns WSAEINVAL.
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317 */
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318
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319 ngx_msleep(timer);
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320
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321 ready = 0;
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322 }
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112
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323
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0
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324 #else
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112
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325
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0
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326 ready = select(max_fd + 1, &work_read_fd_set, &work_write_fd_set, NULL, tp);
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112
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327
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0
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328 #endif
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329
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330 if (ready == -1) {
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331 err = ngx_socket_errno;
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332 } else {
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333 err = 0;
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334 }
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335
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112
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336 if (flags & NGX_UPDATE_TIME) {
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337 ngx_time_update(0, 0);
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338 }
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0
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339
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340 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
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341 "select ready %d", ready);
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342
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112
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343 #if (NGX_WIN32)
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344
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0
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345 if (err) {
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346 ngx_log_error(NGX_LOG_ALERT, cycle->log, err, "select() failed");
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484
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347
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348 if (err == WSAENOTSOCK) {
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349 ngx_select_repair_fd_sets(cycle);
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350 }
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351
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0
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352 return NGX_ERROR;
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353 }
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354
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112
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355 #else
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0
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356
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112
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357 if (err) {
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356
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358 ngx_uint_t level;
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359
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112
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360 if (err == NGX_EINTR) {
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361
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362 if (ngx_event_timer_alarm) {
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363 ngx_event_timer_alarm = 0;
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364 return NGX_OK;
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365 }
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126
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366
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112
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367 level = NGX_LOG_INFO;
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126
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368
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369 } else {
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112
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370 level = NGX_LOG_ALERT;
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371 }
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372
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373 ngx_log_error(level, cycle->log, err, "select() failed");
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484
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374
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375 if (err == EBADF) {
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376 ngx_select_repair_fd_sets(cycle);
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377 }
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378
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0
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379 return NGX_ERROR;
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380 }
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381
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112
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382 #endif
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383
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116
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384 if (ready == 0) {
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385 if (timer != NGX_TIMER_INFINITE) {
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386 return NGX_OK;
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387 }
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388
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389 ngx_log_error(NGX_LOG_ALERT, cycle->log, 0,
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390 "select() returned no events without timeout");
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391 return NGX_ERROR;
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112
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392 }
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393
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394 ngx_mutex_lock(ngx_posted_events_mutex);
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395
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0
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396 nready = 0;
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397
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398 for (i = 0; i < nevents; i++) {
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399 ev = event_index[i];
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400 c = ev->data;
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401 found = 0;
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402
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403 if (ev->write) {
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404 if (FD_ISSET(c->fd, &work_write_fd_set)) {
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405 found = 1;
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406 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
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407 "select write %d", c->fd);
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408 }
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409
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410 } else {
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411 if (FD_ISSET(c->fd, &work_read_fd_set)) {
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412 found = 1;
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413 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
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414 "select read %d", c->fd);
|
|
|
415 }
|
|
|
416 }
|
|
|
417
|
|
|
418 if (found) {
|
|
|
419 ev->ready = 1;
|
|
|
420
|
|
112
|
421 queue = (ngx_event_t **) (ev->accept ? &ngx_posted_accept_events:
|
|
|
422 &ngx_posted_events);
|
|
126
|
423 ngx_locked_post_event(ev, queue);
|
|
0
|
424
|
|
|
425 nready++;
|
|
|
426 }
|
|
|
427 }
|
|
|
428
|
|
112
|
429 ngx_mutex_unlock(ngx_posted_events_mutex);
|
|
0
|
430
|
|
|
431 if (ready != nready) {
|
|
484
|
432 ngx_log_error(NGX_LOG_ALERT, cycle->log, 0,
|
|
|
433 "select ready != events: %d:%d", ready, nready);
|
|
|
434
|
|
|
435 ngx_select_repair_fd_sets(cycle);
|
|
0
|
436 }
|
|
|
437
|
|
|
438 return NGX_OK;
|
|
|
439 }
|
|
|
440
|
|
|
441
|
|
484
|
442 static void
|
|
|
443 ngx_select_repair_fd_sets(ngx_cycle_t *cycle)
|
|
|
444 {
|
|
|
445 int n;
|
|
|
446 socklen_t len;
|
|
|
447 ngx_err_t err;
|
|
|
448 ngx_socket_t s;
|
|
|
449
|
|
|
450 #if (NGX_WIN32)
|
|
|
451 u_int i;
|
|
|
452
|
|
|
453 for (i = 0; i < master_read_fd_set.fd_count; i++) {
|
|
|
454
|
|
|
455 s = master_read_fd_set.fd_array[i];
|
|
|
456 len = sizeof(int);
|
|
|
457
|
|
|
458 if (getsockopt(s, SOL_SOCKET, SO_TYPE, (char *) &n, &len) == -1) {
|
|
|
459 err = ngx_socket_errno;
|
|
|
460
|
|
|
461 ngx_log_error(NGX_LOG_ALERT, cycle->log, err,
|
|
|
462 "invalid descriptor #%d in read fd_set", s);
|
|
|
463
|
|
|
464 FD_CLR(s, &master_read_fd_set);
|
|
|
465 }
|
|
|
466 }
|
|
|
467
|
|
|
468 for (i = 0; i < master_write_fd_set.fd_count; i++) {
|
|
|
469
|
|
|
470 s = master_write_fd_set.fd_array[i];
|
|
|
471 len = sizeof(int);
|
|
|
472
|
|
|
473 if (getsockopt(s, SOL_SOCKET, SO_TYPE, (char *) &n, &len) == -1) {
|
|
|
474 err = ngx_socket_errno;
|
|
|
475
|
|
|
476 ngx_log_error(NGX_LOG_ALERT, cycle->log, err,
|
|
|
477 "invalid descriptor #%d in write fd_set", s);
|
|
|
478
|
|
|
479 FD_CLR(s, &master_write_fd_set);
|
|
|
480 }
|
|
|
481 }
|
|
|
482
|
|
|
483 #else
|
|
|
484
|
|
|
485 for (s = 0; s <= max_fd; s++) {
|
|
|
486
|
|
|
487 if (FD_ISSET(s, &master_read_fd_set) == 0) {
|
|
|
488 continue;
|
|
|
489 }
|
|
|
490
|
|
|
491 len = sizeof(int);
|
|
|
492
|
|
|
493 if (getsockopt(s, SOL_SOCKET, SO_TYPE, &n, &len) == -1) {
|
|
|
494 err = ngx_socket_errno;
|
|
|
495
|
|
|
496 ngx_log_error(NGX_LOG_ALERT, cycle->log, err,
|
|
|
497 "invalid descriptor #%d in read fd_set", s);
|
|
|
498
|
|
|
499 FD_CLR(s, &master_read_fd_set);
|
|
|
500 }
|
|
|
501 }
|
|
|
502
|
|
|
503 for (s = 0; s <= max_fd; s++) {
|
|
|
504
|
|
|
505 if (FD_ISSET(s, &master_write_fd_set) == 0) {
|
|
|
506 continue;
|
|
|
507 }
|
|
|
508
|
|
|
509 len = sizeof(int);
|
|
|
510
|
|
|
511 if (getsockopt(s, SOL_SOCKET, SO_TYPE, &n, &len) == -1) {
|
|
|
512 err = ngx_socket_errno;
|
|
|
513
|
|
|
514 ngx_log_error(NGX_LOG_ALERT, cycle->log, err,
|
|
|
515 "invalid descriptor #%d in write fd_set", s);
|
|
|
516
|
|
|
517 FD_CLR(s, &master_write_fd_set);
|
|
|
518 }
|
|
|
519 }
|
|
|
520
|
|
|
521 max_fd = -1;
|
|
|
522
|
|
|
523 #endif
|
|
|
524 }
|
|
|
525
|
|
|
526
|
|
50
|
527 static char *
|
|
|
528 ngx_select_init_conf(ngx_cycle_t *cycle, void *conf)
|
|
0
|
529 {
|
|
|
530 ngx_event_conf_t *ecf;
|
|
|
531
|
|
|
532 ecf = ngx_event_get_conf(cycle->conf_ctx, ngx_event_core_module);
|
|
|
533
|
|
|
534 if (ecf->use != ngx_select_module.ctx_index) {
|
|
|
535 return NGX_CONF_OK;
|
|
|
536 }
|
|
|
537
|
|
|
538 /* disable warning: the default FD_SETSIZE is 1024U in FreeBSD 5.x */
|
|
|
539
|
|
10
|
540 #if !(NGX_WIN32)
|
|
112
|
541
|
|
384
|
542 if (cycle->connection_n > FD_SETSIZE) {
|
|
0
|
543 ngx_log_error(NGX_LOG_EMERG, cycle->log, 0,
|
|
|
544 "the maximum number of files "
|
|
384
|
545 "supported by select() is %ud", FD_SETSIZE);
|
|
0
|
546 return NGX_CONF_ERROR;
|
|
|
547 }
|
|
112
|
548
|
|
0
|
549 #endif
|
|
|
550
|
|
10
|
551 #if (NGX_THREADS) && !(NGX_WIN32)
|
|
112
|
552
|
|
0
|
553 ngx_log_error(NGX_LOG_EMERG, cycle->log, 0,
|
|
|
554 "select() is not supported in the threaded mode");
|
|
|
555 return NGX_CONF_ERROR;
|
|
112
|
556
|
|
0
|
557 #else
|
|
112
|
558
|
|
0
|
559 return NGX_CONF_OK;
|
|
112
|
560
|
|
0
|
561 #endif
|
|
|
562 }
|
