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/*
* BRLTTY - A background process providing access to the console screen (when in
* text mode) for a blind person using a refreshable braille display.
*
* Copyright (C) 1995-2024 by The BRLTTY Developers.
*
* BRLTTY comes with ABSOLUTELY NO WARRANTY.
*
* This is free software, placed under the terms of the
* GNU Lesser General Public License, as published by the Free Software
* Foundation; either version 2.1 of the License, or (at your option) any
* later version. Please see the file LICENSE-LGPL for details.
*
* Web Page: http://brltty.app/
*
* This software is maintained by Dave Mielke <dave@mielke.cc>.
*/
#include "prologue.h"
#include <string.h>
#include "log.h"
#include "async_io.h"
#include "async_event.h"
#include "async_internal.h"
#include "file.h"
#include "io_misc.h"
struct AsyncEventStruct {
AsyncEventCallback *callback;
void *data;
FileDescriptor pipeInput;
FileDescriptor pipeOutput;
FileDescriptor monitorDescriptor;
AsyncHandle monitorHandle;
#ifdef __MINGW32__
CRITICAL_SECTION criticalSection;
unsigned int pendingCount;
#endif /* __MINGW32__ */
};
ASYNC_MONITOR_CALLBACK(asyncMonitorEventPipe) {
AsyncEvent *event = parameters->data;
void *data;
const size_t size = sizeof(data);
if (readFileDescriptor(event->pipeOutput, &data, size) == size) {
#ifdef __MINGW32__
EnterCriticalSection(&event->criticalSection);
if (!--event->pendingCount) ResetEvent(event->monitorDescriptor);
LeaveCriticalSection(&event->criticalSection);
#endif /* __MINGW32__ */
{
AsyncEventCallback *callback = event->callback;
const AsyncEventCallbackParameters parameters = {
.eventData = event->data,
.signalData = data
};
logSymbol(LOG_CATEGORY(ASYNC_EVENTS), callback, "event starting");
if (callback) callback(¶meters);
}
return 1;
}
return 0;
}
int
asyncSignalEvent (AsyncEvent *event, void *data) {
const size_t size = sizeof(data);
ssize_t result = writeFileDescriptor(event->pipeInput, &data, size);
if (result == size) {
#ifdef __MINGW32__
EnterCriticalSection(&event->criticalSection);
if (!event->pendingCount++) SetEvent(event->monitorDescriptor);
LeaveCriticalSection(&event->criticalSection);
#endif /* __MINGW32__ */
return 1;
}
if (result == -1) {
logSystemError("write");
} else {
logMessage(LOG_ERR, "short write");
}
return 0;
}
AsyncEvent *
asyncNewEvent (AsyncEventCallback *callback, void *data) {
AsyncEvent *event;
if ((event = malloc(sizeof(*event)))) {
memset(event, 0, sizeof(*event));
event->callback = callback;
event->data = data;
if (createAnonymousPipe(&event->pipeInput, &event->pipeOutput)) {
#ifdef __MINGW32__
if (!(event->monitorDescriptor = CreateEvent(NULL, TRUE, FALSE, NULL))) {
logWindowsSystemError("CreateEvent");
event->monitorDescriptor = INVALID_FILE_DESCRIPTOR;
}
#else /* __MINGW32__ */
setCloseOnExec(event->pipeInput, 1);
setCloseOnExec(event->pipeOutput, 1);
event->monitorDescriptor = event->pipeOutput;
#endif /* __MINGW32__ */
if (event->monitorDescriptor != INVALID_FILE_DESCRIPTOR) {
if (asyncMonitorFileInput(&event->monitorHandle, event->monitorDescriptor,
asyncMonitorEventPipe, event)) {
#ifdef __MINGW32__
InitializeCriticalSection(&event->criticalSection);
event->pendingCount = 0;
#endif /* __MINGW32__ */
logSymbol(LOG_CATEGORY(ASYNC_EVENTS), event->callback, "event added");
return event;
}
closeFileDescriptor(event->monitorDescriptor);
}
closeFileDescriptor(event->pipeInput);
closeFileDescriptor(event->pipeOutput);
}
free(event);
} else {
logMallocError();
}
return NULL;
}
void
asyncDiscardEvent (AsyncEvent *event) {
asyncCancelRequest(event->monitorHandle);
closeFileDescriptor(event->pipeInput);
closeFileDescriptor(event->pipeOutput);
#ifdef __MINGW32__
CloseHandle(event->monitorDescriptor);
DeleteCriticalSection(&event->criticalSection);
#endif /* __MINGW32__ */
logSymbol(LOG_CATEGORY(ASYNC_EVENTS), event->callback, "event removed");
free(event);
}
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