src/server/daemon/event_bsd.c

Sun, 06 Nov 2022 17:41:39 +0100

author
Olaf Wintermann <olaf.wintermann@gmail.com>
date
Sun, 06 Nov 2022 17:41:39 +0100
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parent 342
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child 433
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permissions
-rw-r--r--

prepare serverconfig parser to be also used for obj.conf and init.conf

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

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