1 //
2 // Copyright 2017 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 #include "hci_protocol.h"
18
19 #define LOG_TAG "android.hardware.bluetooth-hci-hci_protocol"
20 #include <assert.h>
21 #include <fcntl.h>
22 #include <log/log.h>
23
24 namespace android {
25 namespace hardware {
26 namespace bluetooth {
27 namespace hci {
28
WriteSafely(int fd,const uint8_t * data,size_t length)29 size_t HciProtocol::WriteSafely(int fd, const uint8_t* data, size_t length) {
30 size_t transmitted_length = 0;
31 while (length > 0) {
32 ssize_t ret =
33 TEMP_FAILURE_RETRY(write(fd, data + transmitted_length, length));
34
35 if (ret == -1) {
36 if (errno == EAGAIN) continue;
37 ALOGE("%s error writing to UART (%s)", __func__, strerror(errno));
38 break;
39
40 } else if (ret == 0) {
41 // Nothing written :(
42 ALOGE("%s zero bytes written - something went wrong...", __func__);
43 break;
44 }
45
46 transmitted_length += ret;
47 length -= ret;
48 }
49
50 return transmitted_length;
51 }
52
53 } // namespace hci
54 } // namespace bluetooth
55 } // namespace hardware
56 } // namespace android
57