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/*
Copyright (C) 2009 Red Hat, Inc.
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 2 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 "stdio.h"
#include "virtio_vdi_port.h"
#include "vdlog.h"
#define VIOSERIAL_PORT_PATH L"\\\\.\\Global\\com.redhat.spice.0"
// Current limitation of virtio-serial windows driver (RHBZ 617000)
#define VIOSERIAL_PORT_MAX_WRITE_BYTES 2048
VirtioVDIPort* VirtioVDIPort::_singleton;
VirtioVDIPort::VirtioVDIPort()
: VDIPort()
, _handle (INVALID_HANDLE_VALUE)
{
_singleton = this;
}
VirtioVDIPort::~VirtioVDIPort()
{
if (_handle != INVALID_HANDLE_VALUE) {
CloseHandle(_handle);
}
if (_read.overlap.hEvent) {
CloseHandle(_read.overlap.hEvent);
}
if (_write.overlap.hEvent) {
CloseHandle(_write.overlap.hEvent);
}
}
void VirtioVDIPort::fill_events(HANDLE* handles) {
handles[VIRTIO_VDI_PORT_EVENT_WRITE] = _write.overlap.hEvent;
handles[VIRTIO_VDI_PORT_EVENT_READ] = _read.overlap.hEvent;
}
bool VirtioVDIPort::handle_event(int event) {
bool ret;
switch (event) {
case VIRTIO_VDI_PORT_EVENT_WRITE:
ret = write_completion();
break;
case VIRTIO_VDI_PORT_EVENT_READ:
ret = read_completion();
break;
default:
vd_printf("ERROR: unexpected event %d", event);
ret = false;
}
return ret;
}
bool VirtioVDIPort::init()
{
_handle = CreateFile(VIOSERIAL_PORT_PATH, GENERIC_READ | GENERIC_WRITE , 0, NULL,
OPEN_EXISTING, FILE_FLAG_OVERLAPPED, NULL);
if (_handle == INVALID_HANDLE_VALUE) {
vd_printf("CreateFile() %ls failed: %lu", VIOSERIAL_PORT_PATH, GetLastError());
return false;
}
_write.overlap.hEvent = CreateEvent(NULL, FALSE, FALSE, NULL);
if (_write.overlap.hEvent == NULL) {
vd_printf("CreateEvent() failed: %lu", GetLastError());
return false;
}
_read.overlap.hEvent = CreateEvent(NULL, FALSE, FALSE, NULL);
if (_read.overlap.hEvent == NULL) {
vd_printf("CreateEvent() failed: %lu", GetLastError());
return false;
}
return true;
}
int VirtioVDIPort::write()
{
int size;
int ret;
//FIXME: return VDI_PORT_NO_DATA
if (_write.start == _write.end) {
return 0;
}
if (!_write.pending) {
if (_write.start < _write.end) {
size = (int)(_write.end - _write.start);
} else {
size = (int)(&_write.ring[BUF_SIZE] - _write.start);
}
size = MIN(size, VIOSERIAL_PORT_MAX_WRITE_BYTES);
_write.pending = true;
if (WriteFile(_handle, _write.start, size, NULL, &_write.overlap)) {
write_completion();
} if (GetLastError() != ERROR_IO_PENDING) {
return handle_error();
}
}
ret = _write.bytes;
_write.bytes = 0;
return ret;
}
bool VirtioVDIPort::write_completion()
{
DWORD bytes;
if (!_write.pending) {
return true;
}
if (!GetOverlappedResult(_handle, &_write.overlap, &bytes, FALSE)) {
vd_printf("GetOverlappedResult failed: %lu", GetLastError());
return false;
}
_write.start = _write.ring + (_write.start - _write.ring + bytes) % BUF_SIZE;
_write.bytes = bytes;
_write.pending = false;
return true;
}
int VirtioVDIPort::read()
{
int size;
int ret;
if (!_read.pending) {
//FIXME: read_ring_continuous_remaining_size? return VDI_PORT_BUFFER_FULL
if ((_read.end - _read.ring + 1) % BUF_SIZE == _read.start - _read.ring) {
vd_printf("DEBUG: buffer full");
return 0;
}
if (_read.start == _read.end) {
_read.start = _read.end = _read.ring;
}
if (_read.start <= _read.end) {
size = MIN(BUF_SIZE - 1, (int)(&_read.ring[BUF_SIZE] - _read.end));
} else {
size = (int)(_read.start - _read.end - 1);
}
_read.pending = true;
if (ReadFile(_handle, _read.end, size, NULL, &_read.overlap)) {
read_completion();
} else if (GetLastError() != ERROR_IO_PENDING) {
return handle_error();
}
}
ret = _read.bytes;
_read.bytes = 0;
return ret;
}
bool VirtioVDIPort::read_completion()
{
DWORD bytes;
if (!GetOverlappedResult(_handle, &_read.overlap, &bytes, FALSE)) {
DWORD err = GetLastError();
if (err == ERROR_OPERATION_ABORTED || err == ERROR_NO_SYSTEM_RESOURCES) {
_read.pending = false;
return true;
} else if (err != ERROR_MORE_DATA) {
vd_printf("GetOverlappedResult failed: %lu", err);
return false;
}
}
_read.end = _read.ring + (_read.end - _read.ring + bytes) % BUF_SIZE;
_read.bytes = bytes;
_read.pending = false;
return true;
}
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