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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 "bell.h"
#ifdef HAVE_LINUX_INPUT_H
#include <linux/input.h>
#include "system_linux.h"
static InputEventMonitor *inputEventMonitor = NULL;
static int
prepareUinputObject (UinputObject *uinput) {
if (!enableUinputEventType(uinput, EV_SND)) return 0;
if (!enableUinputSound(uinput, SND_BELL)) return 0;
return 1;
}
static void
handleInputEvent (const InputEvent *event) {
switch (event->type) {
case EV_SND: {
int value = event->value;
switch (event->code) {
case SND_BELL:
if (value) alertConsoleBell();
break;
default:
break;
}
break;
}
default:
break;
}
}
int
canMonitorConsoleBell (void) {
return 1;
}
int
startMonitoringConsoleBell (void) {
if (!inputEventMonitor) {
InputEventMonitor *monitor = newInputEventMonitor(
"Console Bell Monitor", prepareUinputObject, handleInputEvent
);
if (!monitor) return 0;
inputEventMonitor = monitor;
}
return 1;
}
void
stopMonitoringConsoleBell (void) {
if (inputEventMonitor) {
destroyInputEventMonitor(inputEventMonitor);
inputEventMonitor = NULL;
}
}
#else /* HAVE_LINUX_INPUT_H */
int
canMonitorConsoleBell (void) {
return 0;
}
int
startMonitoringConsoleBell (void) {
return 0;
}
void
stopMonitoringConsoleBell (void) {
}
#endif /* HAVE_LINUX_INPUT_H */
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