+++ /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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