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/*
* Event loop based on Windows events and WaitForMultipleObjects
* Copyright (c) 2002-2006, Jouni Malinen <j@w1.fi>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* Alternatively, this software may be distributed under the terms of BSD
* license.
*
* See README and COPYING for more details.
*/
#include "includes.h"
#include <winsock2.h>
#include "common.h"
#include "eloop.h"
struct eloop_sock {
int sock;
void *eloop_data;
void *user_data;
eloop_sock_handler handler;
WSAEVENT event;
};
struct eloop_event {
void *eloop_data;
void *user_data;
eloop_event_handler handler;
HANDLE event;
};
struct eloop_timeout {
struct os_time time;
void *eloop_data;
void *user_data;
eloop_timeout_handler handler;
struct eloop_timeout *next;
};
struct eloop_signal {
int sig;
void *user_data;
eloop_signal_handler handler;
int signaled;
};
struct eloop_data {
void *user_data;
int max_sock;
size_t reader_count;
struct eloop_sock *readers;
size_t event_count;
struct eloop_event *events;
struct eloop_timeout *timeout;
int signal_count;
struct eloop_signal *signals;
int signaled;
int pending_terminate;
int terminate;
int reader_table_changed;
struct eloop_signal term_signal;
HANDLE term_event;
HANDLE *handles;
size_t num_handles;
};
static struct eloop_data eloop;
int eloop_init(void *user_data)
{
os_memset(&eloop, 0, sizeof(eloop));
eloop.user_data = user_data;
eloop.num_handles = 1;
eloop.handles = os_malloc(eloop.num_handles *
sizeof(eloop.handles[0]));
if (eloop.handles == NULL)
return -1;
eloop.term_event = CreateEvent(NULL, FALSE, FALSE, NULL);
if (eloop.term_event == NULL) {
printf("CreateEvent() failed: %d\n",
(int) GetLastError());
os_free(eloop.handles);
return -1;
}
return 0;
}
static int eloop_prepare_handles(void)
{
HANDLE *n;
if (eloop.num_handles > eloop.reader_count + eloop.event_count + 8)
return 0;
n = os_realloc(eloop.handles,
eloop.num_handles * 2 * sizeof(eloop.handles[0]));
if (n == NULL)
return -1;
eloop.handles = n;
eloop.num_handles *= 2;
return 0;
}
int eloop_register_read_sock(int sock, eloop_sock_handler handler,
void *eloop_data, void *user_data)
{
WSAEVENT event;
struct eloop_sock *tmp;
if (eloop_prepare_handles())
return -1;
event = WSACreateEvent();
if (event == WSA_INVALID_EVENT) {
printf("WSACreateEvent() failed: %d\n", WSAGetLastError());
return -1;
}
if (WSAEventSelect(sock, event, FD_READ)) {
printf("WSAEventSelect() failed: %d\n", WSAGetLastError());
WSACloseEvent(event);
return -1;
}
tmp = os_realloc(eloop.readers,
(eloop.reader_count + 1) * sizeof(struct eloop_sock));
if (tmp == NULL) {
WSAEventSelect(sock, event, 0);
WSACloseEvent(event);
return -1;
}
tmp[eloop.reader_count].sock = sock;
tmp[eloop.reader_count].eloop_data = eloop_data;
tmp[eloop.reader_count].user_data = user_data;
tmp[eloop.reader_count].handler = handler;
tmp[eloop.reader_count].event = event;
eloop.reader_count++;
eloop.readers = tmp;
if (sock > eloop.max_sock)
eloop.max_sock = sock;
eloop.reader_table_changed = 1;
return 0;
}
void eloop_unregister_read_sock(int sock)
{
size_t i;
if (eloop.readers == NULL || eloop.reader_count == 0)
return;
for (i = 0; i < eloop.reader_count; i++) {
if (eloop.readers[i].sock == sock)
break;
}
if (i == eloop.reader_count)
return;
WSAEventSelect(eloop.readers[i].sock, eloop.readers[i].event, 0);
WSACloseEvent(eloop.readers[i].event);
if (i != eloop.reader_count - 1) {
os_memmove(&eloop.readers[i], &eloop.readers[i + 1],
(eloop.reader_count - i - 1) *
sizeof(struct eloop_sock));
}
eloop.reader_count--;
eloop.reader_table_changed = 1;
}
int eloop_register_event(void *event, size_t event_size,
eloop_event_handler handler,
void *eloop_data, void *user_data)
{
struct eloop_event *tmp;
HANDLE h = event;
if (event_size != sizeof(HANDLE) || h == INVALID_HANDLE_VALUE)
return -1;
if (eloop_prepare_handles())
return -1;
tmp = os_realloc(eloop.events,
(eloop.event_count + 1) * sizeof(struct eloop_event));
if (tmp == NULL)
return -1;
tmp[eloop.event_count].eloop_data = eloop_data;
tmp[eloop.event_count].user_data = user_data;
tmp[eloop.event_count].handler = handler;
tmp[eloop.event_count].event = h;
eloop.event_count++;
eloop.events = tmp;
return 0;
}
void eloop_unregister_event(void *event, size_t event_size)
{
size_t i;
HANDLE h = event;
if (eloop.events == NULL || eloop.event_count == 0 ||
event_size != sizeof(HANDLE))
return;
for (i = 0; i < eloop.event_count; i++) {
if (eloop.events[i].event == h)
break;
}
if (i == eloop.event_count)
return;
if (i != eloop.event_count - 1) {
os_memmove(&eloop.events[i], &eloop.events[i + 1],
(eloop.event_count - i - 1) *
sizeof(struct eloop_event));
}
eloop.event_count--;
}
int eloop_register_timeout(unsigned int secs, unsigned int usecs,
eloop_timeout_handler handler,
void *eloop_data, void *user_data)
{
struct eloop_timeout *timeout, *tmp, *prev;
timeout = os_malloc(sizeof(*timeout));
if (timeout == NULL)
return -1;
os_get_time(&timeout->time);
timeout->time.sec += secs;
timeout->time.usec += usecs;
while (timeout->time.usec >= 1000000) {
timeout->time.sec++;
timeout->time.usec -= 1000000;
}
timeout->eloop_data = eloop_data;
timeout->user_data = user_data;
timeout->handler = handler;
timeout->next = NULL;
if (eloop.timeout == NULL) {
eloop.timeout = timeout;
return 0;
}
prev = NULL;
tmp = eloop.timeout;
while (tmp != NULL) {
if (os_time_before(&timeout->time, &tmp->time))
break;
prev = tmp;
tmp = tmp->next;
}
if (prev == NULL) {
timeout->next = eloop.timeout;
eloop.timeout = timeout;
} else {
timeout->next = prev->next;
prev->next = timeout;
}
return 0;
}
int eloop_cancel_timeout(eloop_timeout_handler handler,
void *eloop_data, void *user_data)
{
struct eloop_timeout *timeout, *prev, *next;
int removed = 0;
prev = NULL;
timeout = eloop.timeout;
while (timeout != NULL) {
next = timeout->next;
if (timeout->handler == handler &&
(timeout->eloop_data == eloop_data ||
eloop_data == ELOOP_ALL_CTX) &&
(timeout->user_data == user_data ||
user_data == ELOOP_ALL_CTX)) {
if (prev == NULL)
eloop.timeout = next;
else
prev->next = next;
os_free(timeout);
removed++;
} else
prev = timeout;
timeout = next;
}
return removed;
}
int eloop_is_timeout_registered(eloop_timeout_handler handler,
void *eloop_data, void *user_data)
{
struct eloop_timeout *tmp;
tmp = eloop.timeout;
while (tmp != NULL) {
if (tmp->handler == handler &&
tmp->eloop_data == eloop_data &&
tmp->user_data == user_data)
return 1;
tmp = tmp->next;
}
return 0;
}
/* TODO: replace with suitable signal handler */
#if 0
static void eloop_handle_signal(int sig)
{
int i;
eloop.signaled++;
for (i = 0; i < eloop.signal_count; i++) {
if (eloop.signals[i].sig == sig) {
eloop.signals[i].signaled++;
break;
}
}
}
#endif
static void eloop_process_pending_signals(void)
{
int i;
if (eloop.signaled == 0)
return;
eloop.signaled = 0;
if (eloop.pending_terminate) {
eloop.pending_terminate = 0;
}
for (i = 0; i < eloop.signal_count; i++) {
if (eloop.signals[i].signaled) {
eloop.signals[i].signaled = 0;
eloop.signals[i].handler(eloop.signals[i].sig,
eloop.user_data,
eloop.signals[i].user_data);
}
}
if (eloop.term_signal.signaled) {
eloop.term_signal.signaled = 0;
eloop.term_signal.handler(eloop.term_signal.sig,
eloop.user_data,
eloop.term_signal.user_data);
}
}
int eloop_register_signal(int sig, eloop_signal_handler handler,
void *user_data)
{
struct eloop_signal *tmp;
tmp = os_realloc(eloop.signals,
(eloop.signal_count + 1) *
sizeof(struct eloop_signal));
if (tmp == NULL)
return -1;
tmp[eloop.signal_count].sig = sig;
tmp[eloop.signal_count].user_data = user_data;
tmp[eloop.signal_count].handler = handler;
tmp[eloop.signal_count].signaled = 0;
eloop.signal_count++;
eloop.signals = tmp;
/* TODO: register signal handler */
return 0;
}
#ifndef _WIN32_WCE
static BOOL eloop_handle_console_ctrl(DWORD type)
{
switch (type) {
case CTRL_C_EVENT:
case CTRL_BREAK_EVENT:
eloop.signaled++;
eloop.term_signal.signaled++;
SetEvent(eloop.term_event);
return TRUE;
default:
return FALSE;
}
}
#endif /* _WIN32_WCE */
int eloop_register_signal_terminate(eloop_signal_handler handler,
void *user_data)
{
#ifndef _WIN32_WCE
if (SetConsoleCtrlHandler((PHANDLER_ROUTINE) eloop_handle_console_ctrl,
TRUE) == 0) {
printf("SetConsoleCtrlHandler() failed: %d\n",
(int) GetLastError());
return -1;
}
#endif /* _WIN32_WCE */
eloop.term_signal.handler = handler;
eloop.term_signal.user_data = user_data;
return 0;
}
int eloop_register_signal_reconfig(eloop_signal_handler handler,
void *user_data)
{
/* TODO */
return 0;
}
void eloop_run(void)
{
struct os_time tv, now;
DWORD count, ret, timeout, err;
size_t i;
while (!eloop.terminate &&
(eloop.timeout || eloop.reader_count > 0 ||
eloop.event_count > 0)) {
if (eloop.timeout) {
os_get_time(&now);
if (os_time_before(&now, &eloop.timeout->time))
os_time_sub(&eloop.timeout->time, &now, &tv);
else
tv.sec = tv.usec = 0;
}
count = 0;
for (i = 0; i < eloop.event_count; i++)
eloop.handles[count++] = eloop.events[i].event;
for (i = 0; i < eloop.reader_count; i++)
eloop.handles[count++] = eloop.readers[i].event;
if (eloop.term_event)
eloop.handles[count++] = eloop.term_event;
if (eloop.timeout)
timeout = tv.sec * 1000 + tv.usec / 1000;
else
timeout = INFINITE;
if (count > MAXIMUM_WAIT_OBJECTS) {
printf("WaitForMultipleObjects: Too many events: "
"%d > %d (ignoring extra events)\n",
(int) count, MAXIMUM_WAIT_OBJECTS);
count = MAXIMUM_WAIT_OBJECTS;
}
#ifdef _WIN32_WCE
ret = WaitForMultipleObjects(count, eloop.handles, FALSE,
timeout);
#else /* _WIN32_WCE */
ret = WaitForMultipleObjectsEx(count, eloop.handles, FALSE,
timeout, TRUE);
#endif /* _WIN32_WCE */
err = GetLastError();
eloop_process_pending_signals();
/* check if some registered timeouts have occurred */
if (eloop.timeout) {
struct eloop_timeout *tmp;
os_get_time(&now);
if (!os_time_before(&now, &eloop.timeout->time)) {
tmp = eloop.timeout;
eloop.timeout = eloop.timeout->next;
tmp->handler(tmp->eloop_data,
tmp->user_data);
os_free(tmp);
}
}
if (ret == WAIT_FAILED) {
printf("WaitForMultipleObjects(count=%d) failed: %d\n",
(int) count, (int) err);
os_sleep(1, 0);
continue;
}
#ifndef _WIN32_WCE
if (ret == WAIT_IO_COMPLETION)
continue;
#endif /* _WIN32_WCE */
if (ret == WAIT_TIMEOUT)
continue;
while (ret >= WAIT_OBJECT_0 &&
ret < WAIT_OBJECT_0 + eloop.event_count) {
eloop.events[ret].handler(
eloop.events[ret].eloop_data,
eloop.events[ret].user_data);
ret = WaitForMultipleObjects(eloop.event_count,
eloop.handles, FALSE, 0);
}
eloop.reader_table_changed = 0;
for (i = 0; i < eloop.reader_count; i++) {
WSANETWORKEVENTS events;
if (WSAEnumNetworkEvents(eloop.readers[i].sock,
eloop.readers[i].event,
&events) == 0 &&
(events.lNetworkEvents & FD_READ)) {
eloop.readers[i].handler(
eloop.readers[i].sock,
eloop.readers[i].eloop_data,
eloop.readers[i].user_data);
if (eloop.reader_table_changed)
break;
}
}
}
}
void eloop_terminate(void)
{
eloop.terminate = 1;
SetEvent(eloop.term_event);
}
void eloop_destroy(void)
{
struct eloop_timeout *timeout, *prev;
timeout = eloop.timeout;
while (timeout != NULL) {
prev = timeout;
timeout = timeout->next;
os_free(prev);
}
os_free(eloop.readers);
os_free(eloop.signals);
if (eloop.term_event)
CloseHandle(eloop.term_event);
os_free(eloop.handles);
eloop.handles = NULL;
os_free(eloop.events);
eloop.events = NULL;
}
int eloop_terminated(void)
{
return eloop.terminate;
}
void eloop_wait_for_read_sock(int sock)
{
WSAEVENT event;
event = WSACreateEvent();
if (event == WSA_INVALID_EVENT) {
printf("WSACreateEvent() failed: %d\n", WSAGetLastError());
return;
}
if (WSAEventSelect(sock, event, FD_READ)) {
printf("WSAEventSelect() failed: %d\n", WSAGetLastError());
WSACloseEvent(event);
return ;
}
WaitForSingleObject(event, INFINITE);
WSAEventSelect(sock, event, 0);
WSACloseEvent(event);
}
void * eloop_get_user_data(void)
{
return eloop.user_data;
}
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