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
|
/*
* Copyright (C) 2009 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/** \file
This file consists of implementation of class AdbLegacyIOCompletion that
encapsulates a wrapper around OVERLAPPED Win32 structure returned from
asynchronous I/O requests issued via legacy USB API.
*/
#include "stdafx.h"
#include "adb_legacy_io_completion.h"
AdbLegacyIOCompletion::AdbLegacyIOCompletion(
AdbLegacyEndpointObject* parent_io_obj,
ULONG expected_trans_size,
HANDLE event_hndl,
bool is_write_ctl)
: AdbIOCompletion(parent_io_obj, expected_trans_size, event_hndl),
transferred_bytes_(0),
is_write_ioctl_(is_write_ctl) {
}
AdbLegacyIOCompletion::~AdbLegacyIOCompletion() {
}
bool AdbLegacyIOCompletion::GetOvelappedIoResult(LPOVERLAPPED ovl_data,
ULONG* bytes_transferred,
bool wait) {
if (NULL != bytes_transferred) {
*bytes_transferred = 0;
}
if (!IsOpened()) {
SetLastError(ERROR_INVALID_HANDLE);
return false;
}
ULONG transfer;
bool ret = GetOverlappedResult(parent_legacy_io_object()->usb_handle(),
overlapped(),
&transfer,
wait) ? true :
false;
// TODO: This is bizzare but I've seen it happening
// that GetOverlappedResult with wait set to true returns "prematurely",
// with wrong transferred bytes value and GetLastError reporting
// ERROR_IO_PENDING. So, lets give it an up to a 20 ms loop!
ULONG error = GetLastError();
if (wait && ret && (0 == transfer) && (0 != expected_transfer_size_) &&
((ERROR_IO_INCOMPLETE == error) || (ERROR_IO_PENDING == error))) {
for (int trying = 0; trying < 10; trying++) {
Sleep(2);
ret = GetOverlappedResult(parent_legacy_io_object()->usb_handle(),
overlapped(),
&transfer,
wait) ? true :
false;
error = GetLastError();
if (!ret || (0 != transfer) ||
((ERROR_IO_INCOMPLETE != error) && (ERROR_IO_PENDING != error))) {
break;
}
}
}
if (NULL != ovl_data) {
CopyMemory(ovl_data, overlapped(), sizeof(OVERLAPPED));
}
if (NULL != bytes_transferred) {
*bytes_transferred = is_write_ioctl() ? transferred_bytes_ : transfer;
}
return ret;
}
|
