src/server/daemon/event_bsd.c

Wed, 06 Sep 2023 22:48:08 +0200

author
Olaf Wintermann <olaf.wintermann@gmail.com>
date
Wed, 06 Sep 2023 22:48:08 +0200
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parent 503
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child 529
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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
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32 #include "../util/atomic.h"
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33 #include "../util/io.h"
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34
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35 #include "event_bsd.h"
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36
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37 EVHandler* evhandler_create(EventHandlerConfig *cfg) {
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38 EVHandler *ev = malloc(sizeof(EVHandler));
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39 ev->current = 0;
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40 ev->instances = calloc(cfg->nthreads, sizeof(void*));
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41 ev->numins = cfg->nthreads;
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42
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43 for(int i=0;i<cfg->nthreads;i++) {
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44 EventHandler *handler = malloc(sizeof(EventHandler));
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45 ev->instances[i] = handler;
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46
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47 handler->kqueue = kqueue();
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48 if(handler->kqueue < 0) {
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49 log_ereport(LOG_FAILURE, "evhandler_create: kqueue: %s", strerror(errno));
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50 return NULL;
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51 }
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52
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53 SYS_THREAD t = systhread_start(
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54 0,
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55 0,
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56 (thrstartfunc)ev_handle_events,
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57 handler);
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58 systhread_detach(t);
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59 }
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60
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61 return ev;
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62 }
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63
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64
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65 void ev_handle_events(EventHandler *ev) {
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66 struct timespec timeout;
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67 timeout.tv_nsec = 0;
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68 timeout.tv_sec = 600;
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69
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70 struct kevent events[64];
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71 struct kevent changes[128];
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72 int numchanges = 0;
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73
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74 for(;;) {
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75 // wait for events
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76 int nev = kevent(ev->kqueue, changes, numchanges, events, 64, &timeout);
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77 if(nev == -1) {
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78 log_ereport(LOG_FAILURE, "kevent: %s", strerror(errno));
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79 continue;
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80 }
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81
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82 numchanges = 0;
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83 for(int i=0;i<nev;i++) {
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84 Event *event = (Event*)events[i].udata;
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85 if(!event) {
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86 if(events[i].flags == 0) {
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87 log_ereport(LOG_WARN, "Unknown kevent (ident=%d)", (int)events[i].ident);
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88 }
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89 // don't warn in case flags is not 0, because socket EOF events
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90 // are triggered even if we apply EV_DELETE in the changelist
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91 // the only way to stop this is to apply the changelist without
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92 // getting new events, but that comes with a performance penalty
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93
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94 continue;
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95 }
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96 int event_events = event->events;
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97
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98 if(event->fn) {
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99 int saved_ev = event->events;
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100 if(!event->fn(ev, event)) {
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101 // ret 0 => remove event
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102
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103 if(event->finish) {
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104 event->finish(ev, event);
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105 }
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106
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107 event_events = 0;
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108 } else {
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109 event_events = event->events;
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110 }
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111
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112 // if events have changed, we need to add/remove filters
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113 if(saved_ev != event_events) {
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114 int e = event_events;
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115 int e_fd = events[i].ident;
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116 if((e & EVENT_POLLIN) != (saved_ev & EVENT_POLLIN)) {
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117 if((e & EVENT_POLLIN) == EVENT_POLLIN) {
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118 // add
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119 EV_SET(&changes[numchanges++], e_fd, EVFILT_READ, EV_ADD, 0, 0, event);
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120 } else {
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121 // delete
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122 EV_SET(&changes[numchanges++], e_fd, EVFILT_READ, EV_DELETE, 0, 0, NULL);
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123 }
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124 }
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125 if((e & EVENT_POLLOUT) != (saved_ev & EVENT_POLLOUT)) {
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126 if((e & EVENT_POLLOUT) == EVENT_POLLOUT) {
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127 // add
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128 EV_SET(&changes[numchanges++], e_fd, EVFILT_WRITE, EV_ADD, 0, 0, event);
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129 } else {
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130 // delete
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131 EV_SET(&changes[numchanges++], e_fd, EVFILT_WRITE, EV_DELETE, 0, 0, NULL);
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132 }
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133 }
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134 }
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135 }
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136 }
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137 }
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138 }
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139
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140 int ev_pollin(EventHandler *h, int fd, Event *event) {
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141 event->events = EVENT_POLLIN;
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142 struct kevent kev;
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143 EV_SET(&kev, fd, EVFILT_READ, EV_ADD, 0, 0, event);
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144 return kevent(h->kqueue, &kev, 1, NULL, 0, NULL);
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145 }
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146
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147 int ev_pollout(EventHandler *h, int fd, Event *event) {
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148 event->events = EVENT_POLLOUT;
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149 struct kevent kev;
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150 EV_SET(&kev, fd, EVFILT_WRITE, EV_ADD, 0, 0, event);
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151 return kevent(h->kqueue, &kev, 1, NULL, 0, NULL);
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152 }
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153
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154 int ev_remove_poll(EventHandler *h, int fd) {
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155 struct kevent kev;
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156 EV_SET(&kev, fd, EVFILT_READ, EV_DELETE, 0, 0, NULL);
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157 int r1 = kevent(h->kqueue, &kev, 1, NULL, 0, NULL);
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158 EV_SET(&kev, fd, EVFILT_WRITE, EV_DELETE, 0, 0, NULL);
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159 int r2 = kevent(h->kqueue, &kev, 1, NULL, 0, NULL);
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160 // in case r1 or r2 was successful, we return 0 (no error)
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161 return r1 != -1 || r2 != -1 ? 0 : 1;
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162 }
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163
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164 int event_send(EventHandler *h, Event *event) {
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165 return 0;
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166 }
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167
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168 // TODO: remove this fake aio
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169 int ev_aioread(int fd, aiocb_s *cb) {
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170 ssize_t result = pread(fd, cb->buf, cb->nbytes, cb->offset);
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171 cb->result = result;
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172 if(result < 0) {
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173 cb->result_errno = errno;
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174 }
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175 return event_send(cb->evhandler, cb->event);
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176 }
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177
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178 int ev_aiowrite(int fd, aiocb_s *cb) {
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179 ssize_t result = pwrite(fd, cb->buf, cb->nbytes, cb->offset);
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180 cb->result = result;
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181 if(result < 0) {
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182 cb->result_errno = errno;
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183 }
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184 return event_send(cb->evhandler, cb->event);
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185 }
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186
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187
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188 int event_pollin(EventHandler *ev, SYS_NETFD fd, Event *event) {
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189 return ((IOStream*)fd)->poll(fd, ev, IO_POLL_IN, event);
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190 }
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191
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192 int event_pollout(EventHandler *ev, SYS_NETFD fd, Event *event) {
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193 return ((IOStream*)fd)->poll(fd, ev, IO_POLL_OUT, event);
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194 }
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195
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196 int event_removepoll(EventHandler *ev, SYS_NETFD fd) {
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197 return ((IOStream*)fd)->poll(fd, ev, IO_POLL_NONE, NULL);
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198 }

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