1 /* IOEngine_select.c - IOMultiplexer
2 * Copyright (C) 2014 Philipp Kreil (pk910)
4 * This program is free software: you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation, either version 3 of the License, or
7 * (at your option) any later version.
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
14 * You should have received a copy of the GNU General Public License
15 * along with this program. If not, see <http://www.gnu.org/licenses/>.
17 #define _IOHandler_internals
18 #include "IOInternal.h"
19 #include "IOHandler.h"
21 #include "IOSockets.h"
32 #define _WIN32_WINNT 0x501
35 #elif defined HAVE_SYS_SELECT_H
36 #include <sys/select.h>
40 #include "compat/utime.h"
42 static int engine_select_init() {
46 static void engine_select_add(struct _IOSocket *iosock) {
50 static void engine_select_remove(struct _IOSocket *iosock) {
54 static void engine_select_update(struct _IOSocket *iosock) {
58 static void engine_select_loop(struct timeval *timeout) {
61 unsigned int fds_size = 0;
62 struct _IOSocket *iosock, *next_iosock;
63 struct timeval now, tout;
71 gettimeofday(&now, NULL);
72 if(iotimer_sorted_descriptors && timeval_is_bigger(now, iotimer_sorted_descriptors->timeout))
75 //get timeout (timer or given timeout)
76 if(iotimer_sorted_descriptors) {
77 tout = iotimer_sorted_descriptors->timeout;
78 tout.tv_sec -= now.tv_sec;
79 tout.tv_usec -= now.tv_usec;
80 if(tout.tv_usec < 0) {
82 tout.tv_usec += 1000000;
86 if(!iotimer_sorted_descriptors || timeval_is_smaler((*timeout), tout)) {
87 tout.tv_usec = timeout->tv_usec;
88 tout.tv_sec = timeout->tv_sec;
91 } else if(iotimer_sorted_descriptors)
95 for(iosock = iosocket_first; iosock; iosock = iosock->next) {
96 if(!(iosock->socket_flags & IOSOCKETFLAG_ACTIVE))
98 if(iosock->fd > fds_size)
99 fds_size = iosock->fd;
101 if(iosocket_wants_reads(iosock))
102 FD_SET(iosock->fd, &read_fds);
103 if(iosocket_wants_writes(iosock))
104 FD_SET(iosock->fd, &write_fds);
107 if(select_result) //select system call
108 select_result = select(fds_size + 1, &read_fds, &write_fds, NULL, timeout);
113 usleep(10000); // 10ms
115 if (select_result < 0) {
116 if (errno != EINTR) {
117 iolog_trigger(IOLOG_FATAL, "select() failed with errno %d %d: %s", select_result, errno, strerror(errno));
122 gettimeofday(&now, NULL);
124 //check all descriptors
125 for(iosock = iosocket_first; iosock; iosock = next_iosock) {
126 next_iosock = iosock->next;
127 if(!(iosock->socket_flags & IOSOCKETFLAG_ACTIVE))
129 if(FD_ISSET(iosock->fd, &read_fds) || FD_ISSET(iosock->fd, &write_fds))
130 iosocket_events_callback(iosock, FD_ISSET(iosock->fd, &read_fds), FD_ISSET(iosock->fd, &write_fds));
134 if(iotimer_sorted_descriptors && timeval_is_bigger(now, iotimer_sorted_descriptors->timeout))
139 static void engine_select_cleanup() {
143 struct IOEngine engine_select = {
145 .init = engine_select_init,
146 .add = engine_select_add,
147 .remove = engine_select_remove,
148 .update = engine_select_update,
149 .loop = engine_select_loop,
150 .cleanup = engine_select_cleanup,