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 <errno.h> 22 #include <fcntl.h> 23 #include <unistd.h> 24 #include <log/log.h> 25 26 namespace android { 27 namespace hardware { 28 namespace bluetooth { 29 namespace hci { 30 31 size_t HciProtocol::WriteSafely(int fd, const uint8_t* data, size_t length) { 32 size_t transmitted_length = 0; 33 while (length > 0) { 34 ssize_t ret = 35 TEMP_FAILURE_RETRY(write(fd, data + transmitted_length, length)); 36 37 if (ret == -1) { 38 if (errno == EAGAIN) continue; 39 ALOGE("%s error writing to UART (%s)", __func__, strerror(errno)); 40 break; 41 42 } else if (ret == 0) { 43 // Nothing written :( 44 ALOGE("%s zero bytes written - something went wrong...", __func__); 45 break; 46 } 47 48 transmitted_length += ret; 49 length -= ret; 50 } 51 52 return transmitted_length; 53 } 54 55 } // namespace hci 56 } // namespace bluetooth 57 } // namespace hardware 58 } // namespace android 59
