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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) 1995-2016 by The BRLTTY Developers.
*
* BRLTTY comes with ABSOLUTELY NO WARRANTY.
*
* This is free software, placed under the terms of the
* GNU General Public License, as published by the Free Software
* Foundation; either version 2 of the License, or (at your option) any
* later version. Please see the file LICENSE-GPL for details.
*
* Web Page: http://brltty.com/
*
* This software is maintained by Dave Mielke <dave@mielke.cc>.
*/
#include "prologue.h"
#include <string.h>
#include "log.h"
#include "io_generic.h"
#include "gio_internal.h"
#include "device.h"
struct GioHandleStruct {
int place_holder;
};
static int
disconnectNullResource (GioHandle *handle) {
free(handle);
return 1;
}
static int
awaitNullInput (GioHandle *handle, int timeout) {
return 1;
}
static ssize_t
readNullData (
GioHandle *handle, void *buffer, size_t size,
int initialTimeout, int subsequentTimeout
) {
return 0;
}
static int
monitorNullInput (GioHandle *handle, AsyncMonitorCallback *callback, void *data) {
return 1;
}
static const GioMethods gioNullMethods = {
.disconnectResource = disconnectNullResource,
.awaitInput = awaitNullInput,
.readData = readNullData,
.monitorInput = monitorNullInput
};
static int
isNullSupported (const GioDescriptor *descriptor) {
return 1;
}
static int
testNullIdentifier (const char **identifier) {
return isQualifiedDevice(identifier, "null");
}
static const GioOptions *
getNullOptions (const GioDescriptor *descriptor) {
return &descriptor->null.options;
}
static const GioMethods *
getNullMethods (void) {
return &gioNullMethods;
}
static GioHandle *
connectNullResource (
const char *identifier,
const GioDescriptor *descriptor
) {
GioHandle *handle = malloc(sizeof(*handle));
if (handle) {
memset(handle, 0, sizeof(*handle));
return handle;
} else {
logMallocError();
}
return NULL;
}
const GioClass gioNullClass = {
.isSupported = isNullSupported,
.testIdentifier = testNullIdentifier,
.getOptions = getNullOptions,
.getMethods = getNullMethods,
.connectResource = connectNullResource,
.resourceType = GIO_RESOURCE_NULL
};
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