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"
29 #define _WIN32_WINNT 0x501
32 #elif defined HAVE_SYS_SELECT_H
33 #include <sys/select.h>
37 #include "compat/utime.h"
39 static int engine_select_init() {
43 static void engine_select_add(struct _IOSocket *iosock) {
47 static void engine_select_remove(struct _IOSocket *iosock) {
51 static void engine_select_update(struct _IOSocket *iosock) {
55 static void engine_select_loop(struct timeval *timeout) {
58 unsigned int fds_size = 0;
59 struct _IOSocket *iosock, *next_iosock;
60 struct timeval now, tout;
68 gettimeofday(&now, NULL);
69 if(iotimer_sorted_descriptors && timeval_is_bigger(now, iotimer_sorted_descriptors->timeout))
72 //get timeout (timer or given timeout)
73 if(iotimer_sorted_descriptors) {
74 tout = iotimer_sorted_descriptors->timeout;
75 tout.tv_sec -= now.tv_sec;
76 tout.tv_usec -= now.tv_usec;
77 if(tout.tv_usec < 0) {
79 tout.tv_usec += 1000000;
83 if(!iotimer_sorted_descriptors || timeval_is_smaler((*timeout), tout)) {
84 tout.tv_usec = timeout->tv_usec;
85 tout.tv_sec = timeout->tv_sec;
88 } else if(iotimer_sorted_descriptors)
92 for(iosock = iosocket_first; iosock; iosock = iosock->next) {
93 if(!(iosock->socket_flags & IOSOCKETFLAG_ACTIVE))
95 if(iosock->fd > fds_size)
96 fds_size = iosock->fd;
98 if(iosocket_wants_reads(iosock))
99 FD_SET(iosock->fd, &read_fds);
100 if(iosocket_wants_writes(iosock))
101 FD_SET(iosock->fd, &write_fds);
104 if(select_result) //select system call
105 select_result = select(fds_size + 1, &read_fds, &write_fds, NULL, timeout);
110 usleep(10000); // 10ms
112 if (select_result < 0) {
113 if (errno != EINTR) {
114 iolog_trigger(IOLOG_FATAL, "select() failed with errno %d %d: %s", select_result, errno, strerror(errno));
119 gettimeofday(&now, NULL);
121 //check all descriptors
122 for(iosock = iosocket_first; iosock; iosock = next_iosock) {
123 next_iosock = iosock->next;
124 if(!(iosock->socket_flags & IOSOCKETFLAG_ACTIVE))
126 if(FD_ISSET(iosock->fd, &read_fds) || FD_ISSET(iosock->fd, &write_fds))
127 iosocket_events_callback(iosock, FD_ISSET(iosock->fd, &read_fds), FD_ISSET(iosock->fd, &write_fds));
131 if(iotimer_sorted_descriptors && timeval_is_bigger(now, iotimer_sorted_descriptors->timeout))
136 static void engine_select_cleanup() {
140 struct IOEngine engine_select = {
142 .init = engine_select_init,
143 .add = engine_select_add,
144 .remove = engine_select_remove,
145 .update = engine_select_update,
146 .loop = engine_select_loop,
147 .cleanup = engine_select_cleanup,