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1 | /* |
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2 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER. |
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3 | * |
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4 | * Copyright 2013 Olaf Wintermann. All rights reserved. |
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5 | * |
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6 | * Redistribution and use in source and binary forms, with or without |
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7 | * modification, are permitted provided that the following conditions are met: |
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8 | * |
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9 | * 1. Redistributions of source code must retain the above copyright |
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10 | * notice, this list of conditions and the following disclaimer. |
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11 | * |
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12 | * 2. Redistributions in binary form must reproduce the above copyright |
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13 | * notice, this list of conditions and the following disclaimer in the |
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14 | * documentation and/or other materials provided with the distribution. |
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15 | * |
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16 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
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17 | * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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18 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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19 | * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE |
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20 | * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
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21 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
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22 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
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23 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
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24 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
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25 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
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26 | * POSSIBILITY OF SUCH DAMAGE. |
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27 | */ |
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28 | |
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29 | #include <stdio.h> |
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30 | #include <stdlib.h> |
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31 | #include <errno.h> |
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32 | #include <sys/epoll.h> |
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33 | #include <sys/eventfd.h> |
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34 | |
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35 | #include "../util/systhr.h" |
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36 | #include "../util/atomic.h" |
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37 | |
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38 | #include "../util/io.h" |
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39 | |
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40 | #include "event.h" |
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41 | #include "event_linux.h" |
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42 | |
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43 | |
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44 | EVHandler* evhandler_create(EventHandlerConfig *cfg) { |
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45 | EVHandler *ev = malloc(sizeof(EVHandler)); |
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46 | ev->current = 0; |
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47 | ev->instances = calloc(cfg->nthreads, sizeof(void*)); |
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48 | ev->numins = cfg->nthreads; |
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49 | |
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50 | for(int i=0;i<cfg->nthreads;i++) { |
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51 | EventHandler *handler = malloc(sizeof(EventHandler)); |
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52 | ev->instances[i] = handler; |
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53 | |
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54 | handler->ep = epoll_create(64); |
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55 | if(handler->ep == 0) { |
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56 | // TODO: error |
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57 | return NULL; |
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58 | } |
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59 | |
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60 | int eventpipe[2]; |
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61 | if(pipe(eventpipe)) { |
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62 | return NULL; |
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63 | } |
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64 | handler->eventin = eventpipe[0]; |
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65 | handler->eventout = eventpipe[1]; |
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66 | |
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67 | struct epoll_event epev; |
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68 | epev.events = EPOLLIN | EPOLLET; // input event, edge triggered |
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69 | epev.data.ptr = NULL; |
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70 | if(epoll_ctl(handler->ep, EPOLL_CTL_ADD, handler->eventin, &epev)) { |
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71 | return NULL; |
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72 | } |
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73 | |
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74 | SYS_THREAD t = systhread_start( |
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75 | 0, |
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76 | 0, |
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77 | (thrstartfunc)ev_handle_events, |
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78 | handler); |
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79 | systhread_detach(t); |
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80 | } |
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81 | |
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82 | return ev; |
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83 | } |
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84 | |
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85 | |
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86 | void ev_handle_events(EventHandler *ev) { |
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87 | int ep = ev->ep; |
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88 | |
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89 | //port_event_t events[16]; |
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90 | struct epoll_event events[16]; |
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91 | |
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92 | for(;;) { |
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93 | /* wait for events */ |
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94 | int ret = epoll_wait(ep, events, 16, 100000); |
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95 | if(ret == -1 && errno != EINTR) { |
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96 | log_ereport(LOG_FAILURE, "epoll_wait failed: %s", strerror(errno)); |
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97 | continue; |
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98 | } |
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99 | |
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100 | for(int i=0;i<ret;i++) { |
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101 | Event *event = events[i].data.ptr; |
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102 | if(!event) { |
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103 | char ebuf[sizeof(Event*)]; |
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104 | int ebufpos = 0; |
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105 | char *b = ebuf; |
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106 | while(ebufpos < sizeof(Event*)) { |
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107 | ssize_t r = read(ev->eventin, b + ebufpos, sizeof(Event*)-ebufpos); |
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108 | if(r < 0) { |
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109 | break; |
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110 | } |
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111 | ebufpos += r; |
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112 | } |
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113 | if(ebufpos == sizeof(Event*)) { |
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114 | intptr_t *p = (intptr_t*)b; |
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115 | *(&event) = (Event*)*p; |
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116 | if(event->fn) { |
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117 | if(!event->fn(ev, event) && event->finish) { |
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118 | event->finish(ev, event); |
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119 | } |
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120 | } |
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121 | } |
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122 | } else if(event->fn) { |
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123 | int saved_ev = event->events; |
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124 | if(!event->fn(ev, event)) { |
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125 | // event fn returned 0 -> remove event from epoll |
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126 | if(epoll_ctl(ep, EPOLL_CTL_DEL, event->object, NULL)) { |
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127 | event->error = 1; |
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128 | log_ereport( |
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129 | LOG_FAILURE, |
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130 | "epoll_ctl failed: fd: %d error: %s", |
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131 | event->object, |
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132 | strerror(errno)); |
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133 | } |
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134 | |
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135 | // if set, execute event->finish |
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136 | if(event->finish) { |
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137 | event->finish(ev, event); |
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138 | } |
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139 | } else { |
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140 | if(saved_ev != event->events) { |
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141 | // event type changed |
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142 | struct epoll_event epev; |
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143 | epev.events = EPOLLET; |
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144 | epev.data.ptr = event; |
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145 | |
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146 | // adjust epoll events |
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147 | epev.events = ev_convert2sys_events(event->events); |
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148 | |
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149 | if(epoll_ctl(ep, EPOLL_CTL_MOD, event->object, &epev)) { |
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150 | log_ereport( |
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151 | LOG_FAILURE, |
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152 | "epoll_wait failed: %s", |
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153 | strerror(errno)); |
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154 | } |
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155 | } |
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156 | } |
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157 | } |
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158 | } |
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159 | } |
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160 | } |
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161 | |
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162 | int ev_convert2sys_events(int events) { |
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163 | int e = EPOLLET; |
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164 | if((events & EVENT_POLLIN) == EVENT_POLLIN) { |
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165 | e |= EPOLLIN; |
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166 | } |
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167 | if((events & EVENT_POLLOUT) == EVENT_POLLOUT) { |
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168 | e |= EPOLLOUT; |
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169 | } |
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170 | return e; |
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171 | } |
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172 | |
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173 | int ev_pollin(EventHandler *h, int fd, Event *event) { |
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174 | event->object = (intptr_t)fd; |
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175 | event->events = EVENT_POLLIN; |
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176 | struct epoll_event epev; |
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177 | epev.events = EPOLLIN | EPOLLET; // input event, edge triggered |
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178 | epev.data.ptr = event; |
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179 | return epoll_ctl(h->ep, EPOLL_CTL_ADD, fd, &epev); |
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180 | } |
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181 | |
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182 | int ev_pollout(EventHandler *h, int fd, Event *event) { |
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183 | event->object = (intptr_t)fd; |
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184 | event->events = EVENT_POLLOUT; |
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185 | struct epoll_event epev; |
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186 | epev.events = EPOLLOUT | EPOLLET; // input event, edge triggered |
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187 | epev.data.ptr = event; |
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188 | return epoll_ctl(h->ep, EPOLL_CTL_ADD, fd, &epev); |
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189 | } |
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190 | |
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191 | int ev_remove_poll(EventHandler *h, int fd) { |
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192 | return epoll_ctl(h->ep, EPOLL_CTL_DEL, fd, NULL); |
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193 | } |
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194 | |
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195 | int event_send(EventHandler *h, Event *event) { |
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196 | event->object = 0; |
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197 | event->events = 0; |
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198 | ssize_t r = write(h->eventout, &event, sizeof(Event*)); |
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199 | if(r < sizeof(Event*)) { |
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200 | log_ereport(LOG_FAILURE, "failed to send event: %s", strerror(errno)); |
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201 | } |
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202 | return r > 0 ? 0 : 1; |
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203 | } |
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204 | |
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205 | // TODO: remove this fake aio |
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206 | int ev_aioread(int fd, aiocb_s *cb) { |
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207 | ssize_t result = pread(fd, cb->buf, cb->nbytes, cb->offset); |
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208 | cb->result = result; |
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209 | if(result < 0) { |
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210 | cb->result_errno = errno; |
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211 | } |
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212 | return event_send(cb->evhandler, cb->event); |
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213 | } |
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214 | |
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215 | int ev_aiowrite(int fd, aiocb_s *cb) { |
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216 | ssize_t result = pwrite(fd, cb->buf, cb->nbytes, cb->offset); |
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217 | cb->result = result; |
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218 | if(result < 0) { |
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219 | cb->result_errno = errno; |
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220 | } |
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221 | return event_send(cb->evhandler, cb->event); |
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222 | } |
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223 | |
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224 | |
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225 | int event_pollin(EventHandler *ev, SYS_NETFD fd, Event *event) { |
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226 | return ((IOStream*)fd)->poll(fd, ev, IO_POLL_IN, event); |
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227 | } |
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228 | |
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229 | int event_pollout(EventHandler *ev, SYS_NETFD fd, Event *event) { |
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230 | return ((IOStream*)fd)->poll(fd, ev, IO_POLL_OUT, event); |
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231 | } |
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232 | |
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233 | int event_removepoll(EventHandler *ev, SYS_NETFD fd) { |
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234 | return ((IOStream*)fd)->poll(fd, ev, IO_POLL_NONE, NULL); |
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235 | } |