| /* |
| * Copyright 2012, 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. |
| */ |
| |
| #include "InputFile.h" |
| |
| #include "DebugHelper.h" |
| |
| using namespace bcc; |
| |
| InputFile::InputFile(const std::string &pFilename, unsigned pFlags) |
| : super(pFilename, pFlags) { } |
| |
| ssize_t InputFile::read(void *pBuf, size_t count) { |
| if ((mFD < 0) || hasError()) { |
| return -1; |
| } |
| |
| if ((count <= 0) || (pBuf == NULL)) { |
| // Keep safe and issue a warning. |
| ALOGW("InputFile::read: count = %zu, buffer = %p", count, pBuf); |
| return 0; |
| } |
| |
| while (count > 0) { |
| ssize_t read_size = ::read(mFD, pBuf, count); |
| |
| if (read_size >= 0) { |
| return read_size; |
| } else if ((errno == EAGAIN) || (errno == EINTR)) { |
| // If the errno is EAGAIN or EINTR, then we try to read again. |
| // |
| // Fall-through |
| } else { |
| detectError(); |
| return -1; |
| } |
| } |
| // unreachable |
| return 0; |
| } |