1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
|
/*
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;
}
void VirtioVDIPort::handle_event(int event) {
switch (event) {
case VIRTIO_VDI_PORT_EVENT_WRITE:
write_completion();
break;
case VIRTIO_VDI_PORT_EVENT_READ:
read_completion();
break;
default:
vd_printf("ERROR: unexpected event %d", event);
}
}
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;
}
void VirtioVDIPort::write_completion()
{
DWORD bytes;
if (!_write.pending) {
return;
}
if (!GetOverlappedResult(_handle, &_write.overlap, &bytes, FALSE)) {
vd_printf("GetOverlappedResult failed: %lu", GetLastError());
return;
}
_write.start = _write.ring + (_write.start - _write.ring + bytes) % BUF_SIZE;
_write.bytes = bytes;
_write.pending = false;
}
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;
}
void VirtioVDIPort::read_completion()
{
DWORD bytes;
if (!GetOverlappedResult(_handle, &_read.overlap, &bytes, FALSE)) {
DWORD err = GetLastError();
if (err == ERROR_OPERATION_ABORTED) {
_read.pending = false;
return;
} else if (err != ERROR_MORE_DATA) {
vd_printf("GetOverlappedResult failed: %lu", err);
return;
}
}
_read.end = _read.ring + (_read.end - _read.ring + bytes) % BUF_SIZE;
_read.bytes = bytes;
_read.pending = false;
}
|
