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 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
