--- /dev/null
+/* IOEngine_select.c - IOMultiplexer
+ * Copyright (C) 2012 Philipp Kreil (pk910)
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+#include "IOEngine.h"
+#include <errno.h>
+#include <time.h>
+#ifdef WIN32
+#define _WIN32_WINNT 0x501
+#include <windows.h>
+#include <winsock2.h>
+#else
+#include <string.h>
+#include <stdio.h>
+#endif
+
+static int engine_select_timer_delay_fix;
+
+static int engine_select_init() {
+ engine_select_timer_delay_fix = 0;
+ return 1;
+}
+
+static void engine_select_add(struct IODescriptor *iofd) {
+ #ifdef WIN32
+ if(iofd->type == IOTYPE_STDIN)
+ SetConsoleMode(GetStdHandle(STD_INPUT_HANDLE),ENABLE_LINE_INPUT|ENABLE_ECHO_INPUT);
+ #endif
+ /* empty */
+}
+
+static void engine_select_remove(struct IODescriptor *iofd) {
+ /* empty */
+}
+
+static void engine_select_update(struct IODescriptor *iofd) {
+ /* empty */
+}
+
+static void engine_select_loop(struct timeval *timeout) {
+ fd_set read_fds;
+ fd_set write_fds;
+ unsigned int fds_size = 0;
+ struct IODescriptor *iofd, *tmp_iofd;
+ struct timeval now, tdiff;
+ int select_result;
+ int timer_fix;
+
+ gettimeofday(&now, NULL);
+
+ //clear fds
+ FD_ZERO(&read_fds);
+ FD_ZERO(&write_fds);
+
+ select_result = 0;
+ for(iofd = first_descriptor; iofd; iofd = tmp_iofd) {
+ tmp_iofd = iofd->next;
+ if(iofd->type == IOTYPE_STDIN) {
+ #ifdef WIN32
+ //WIN32 doesn't support stdin within select
+ //just try to read the single events from the console
+ DWORD dwRead;
+ INPUT_RECORD inRecords[128];
+ unsigned int i;
+ int read_bytes = 0;
+ GetNumberOfConsoleInputEvents(GetStdHandle(STD_INPUT_HANDLE), &dwRead);
+ if(dwRead)
+ ReadConsoleInput(GetStdHandle(STD_INPUT_HANDLE), &inRecords[0], 128, &dwRead);
+ for (i = 0; i < dwRead; ++i) {
+ if (inRecords[i].EventType == KEY_EVENT) {
+ const char c = inRecords[i].Event.KeyEvent.uChar.AsciiChar;
+ if (inRecords[i].Event.KeyEvent.bKeyDown && c != 0) {
+ iofd->readbuf.buffer[iofd->readbuf.bufpos + read_bytes] = c;
+ read_bytes++;
+ }
+ }
+ }
+ if(read_bytes)
+ iohandler_events(iofd, read_bytes, 0);
+ if(read_bytes >= 128) {
+ timeout->tv_sec = 0;
+ timeout->tv_usec = 1;
+ //minimal timeout
+ } else {
+ timeout->tv_sec = 0;
+ timeout->tv_usec = 100000;
+ }
+ #else
+ if(iofd->fd > fds_size)
+ fds_size = iofd->fd;
+ FD_SET(iofd->fd, &read_fds);
+ select_result++;
+ #endif
+ }
+ else if(iofd->type == IOTYPE_SERVER || iofd->type == IOTYPE_CLIENT) {
+ if(iofd->state == IO_CLOSED)
+ continue;
+ if(iofd->fd > fds_size)
+ fds_size = iofd->fd;
+ FD_SET(iofd->fd, &read_fds);
+ select_result++;
+ if(iohandler_wants_writes(iofd))
+ FD_SET(iofd->fd, &write_fds);
+ }
+ }
+
+ while(timer_priority) {
+ tdiff.tv_sec = timer_priority->timeout.tv_sec - now.tv_sec;
+ tdiff.tv_usec = timer_priority->timeout.tv_usec - now.tv_usec;
+ if(tdiff.tv_sec < 0 || (tdiff.tv_sec == 0 && tdiff.tv_usec <= 0)) {
+ if(timer_priority->constant_timeout) {
+ tdiff.tv_sec = 0;
+ iohandler_set_timeout(timer_priority, &tdiff);
+ iohandler_events(timer_priority, 0, 0);
+ } else {
+ iohandler_events(timer_priority, 0, 0);
+ iohandler_close(timer_priority); //also sets timer_priority to the next timed element
+ }
+ continue;
+ } else if(tdiff.tv_usec < 0) {
+ tdiff.tv_sec--;
+ tdiff.tv_usec += 1000000; //1 sec
+ }
+ if(timeval_is_smaler((&tdiff), timeout)) {
+ timeout->tv_sec = tdiff.tv_sec;
+ timeout->tv_usec = tdiff.tv_usec + engine_select_timer_delay_fix;
+ if(timeout->tv_usec < 0) {
+ timeout->tv_sec--;
+ timeout->tv_usec += 1000000;
+ }
+ }
+ break;
+ }
+
+ if(select_result) {
+ //select system call
+ select_result = select(fds_size + 1, &read_fds, &write_fds, NULL, timeout);
+ } else {
+ #ifdef WIN32
+ Sleep((timeout->tv_sec * 1000) + (timeout->tv_usec / 1000) + 1);
+ #else
+ struct timespec usleep_time;
+ usleep_time.tv_sec = timeout->tv_sec;
+ usleep_time.tv_nsec = timeout->tv_usec * 1000;
+ nanosleep(&usleep_time, NULL);
+ #endif
+ }
+
+ if (select_result < 0) {
+ if (errno != EINTR) {
+ iohandler_log(IOLOG_FATAL, "select() failed with errno %d %d: %s", select_result, errno, strerror(errno));
+ return;
+ }
+ }
+
+ gettimeofday(&now, NULL);
+
+ //check all descriptors
+ for(iofd = first_descriptor; iofd; iofd = tmp_iofd) {
+ tmp_iofd = iofd->next;
+ if(iofd->type == IOTYPE_SERVER || iofd->type == IOTYPE_CLIENT || iofd->type == IOTYPE_STDIN) {
+ if(FD_ISSET(iofd->fd, &read_fds) || FD_ISSET(iofd->fd, &write_fds)) {
+ iohandler_events(iofd, FD_ISSET(iofd->fd, &read_fds), FD_ISSET(iofd->fd, &write_fds));
+ continue;
+ }
+ }
+ }
+
+ //check timers
+ while(timer_priority) {
+ tdiff.tv_sec = timer_priority->timeout.tv_sec - now.tv_sec;
+ tdiff.tv_usec = timer_priority->timeout.tv_usec - now.tv_usec;
+ timer_fix = (tdiff.tv_sec * 1000000) + tdiff.tv_usec;
+ if(timer_fix <= 100) {
+ if(timer_fix + 100 < engine_select_timer_delay_fix || timer_fix - 100 > engine_select_timer_delay_fix) {
+ engine_select_timer_delay_fix = ((engine_select_timer_delay_fix * 19) + timer_fix) / 20;
+ iohandler_log(IOLOG_DEBUG, "timer delay fix set to: %d us", engine_select_timer_delay_fix);
+ }
+ if(timer_priority->constant_timeout) {
+ tdiff.tv_sec = 0;
+ iohandler_set_timeout(timer_priority, &tdiff);
+ iohandler_events(timer_priority, 0, 0);
+ } else {
+ iohandler_events(timer_priority, 0, 0);
+ iohandler_close(timer_priority); //also sets timer_priority to the next timed element
+ }
+ continue;
+ }
+ break;
+ }
+
+}
+
+static void engine_select_cleanup() {
+ /* empty */
+}
+
+struct IOEngine engine_select = {
+ .name = "select",
+ .init = engine_select_init,
+ .add = engine_select_add,
+ .remove = engine_select_remove,
+ .update = engine_select_update,
+ .loop = engine_select_loop,
+ .cleanup = engine_select_cleanup,
+};
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