1 /*
2 * Copyright (C) 2009 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 /** \file
18 This file consists of implementation of class AdbLegacyIOCompletion that
19 encapsulates a wrapper around OVERLAPPED Win32 structure returned from
20 asynchronous I/O requests issued via legacy USB API.
21 */
22
23 #include "stdafx.h"
24 #include "adb_legacy_io_completion.h"
25
AdbLegacyIOCompletion(AdbLegacyEndpointObject * parent_io_obj,ULONG expected_trans_size,HANDLE event_hndl,bool is_write_ctl)26 AdbLegacyIOCompletion::AdbLegacyIOCompletion(
27 AdbLegacyEndpointObject* parent_io_obj,
28 ULONG expected_trans_size,
29 HANDLE event_hndl,
30 bool is_write_ctl)
31 : AdbIOCompletion(parent_io_obj, expected_trans_size, event_hndl),
32 transferred_bytes_(0),
33 is_write_ioctl_(is_write_ctl) {
34 }
35
~AdbLegacyIOCompletion()36 AdbLegacyIOCompletion::~AdbLegacyIOCompletion() {
37 }
38
GetOvelappedIoResult(LPOVERLAPPED ovl_data,ULONG * bytes_transferred,bool wait)39 bool AdbLegacyIOCompletion::GetOvelappedIoResult(LPOVERLAPPED ovl_data,
40 ULONG* bytes_transferred,
41 bool wait) {
42 if (NULL != bytes_transferred) {
43 *bytes_transferred = 0;
44 }
45
46 if (!IsOpened()) {
47 SetLastError(ERROR_INVALID_HANDLE);
48 return false;
49 }
50
51 ULONG transfer;
52 bool ret = GetOverlappedResult(parent_legacy_io_object()->usb_handle(),
53 overlapped(),
54 &transfer,
55 wait) ? true :
56 false;
57
58 // TODO: This is bizzare but I've seen it happening
59 // that GetOverlappedResult with wait set to true returns "prematurely",
60 // with wrong transferred bytes value and GetLastError reporting
61 // ERROR_IO_PENDING. So, lets give it an up to a 20 ms loop!
62 ULONG error = GetLastError();
63
64 if (wait && ret && (0 == transfer) && (0 != expected_transfer_size_) &&
65 ((ERROR_IO_INCOMPLETE == error) || (ERROR_IO_PENDING == error))) {
66 for (int trying = 0; trying < 10; trying++) {
67 Sleep(2);
68 ret = GetOverlappedResult(parent_legacy_io_object()->usb_handle(),
69 overlapped(),
70 &transfer,
71 wait) ? true :
72 false;
73 error = GetLastError();
74 if (!ret || (0 != transfer) ||
75 ((ERROR_IO_INCOMPLETE != error) && (ERROR_IO_PENDING != error))) {
76 break;
77 }
78 }
79 }
80
81 if (NULL != ovl_data) {
82 CopyMemory(ovl_data, overlapped(), sizeof(OVERLAPPED));
83 }
84
85 if (NULL != bytes_transferred) {
86 *bytes_transferred = is_write_ioctl() ? transferred_bytes_ : transfer;
87 }
88
89 return ret;
90 }
91