| /* |
| * 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 "bcc/Support/OutputFile.h" |
| |
| #include <cstdlib> |
| |
| #include <llvm/Support/raw_ostream.h> |
| |
| #include "bcc/Support/Log.h" |
| |
| using namespace bcc; |
| |
| OutputFile::OutputFile(const std::string &pFilename, unsigned pFlags) |
| : super(pFilename, pFlags) { } |
| |
| ssize_t OutputFile::write(const void *pBuf, size_t count) { |
| if ((mFD < 0) || hasError()) { |
| return -1; |
| } |
| |
| if ((count <= 0) || (pBuf == nullptr)) { |
| // Keep safe and issue a warning. |
| ALOGW("OutputFile::write: count = %zu, buffer = %p", count, pBuf); |
| return 0; |
| } |
| |
| while (count > 0) { |
| ssize_t write_size = ::write(mFD, pBuf, count); |
| |
| if (write_size > 0) { |
| return write_size; |
| } else if ((errno == EAGAIN) || (errno == EINTR)) { |
| // If the errno is EAGAIN or EINTR, then we try to write again. |
| // |
| // Fall-through |
| } else { |
| detectError(); |
| return -1; |
| } |
| } |
| // unreachable |
| return 0; |
| } |
| |
| void OutputFile::truncate() { |
| if (mFD < 0) { |
| return; |
| } |
| |
| do { |
| if (::ftruncate(mFD, 0) == 0) { |
| return; |
| } |
| } while (errno == EINTR); |
| detectError(); |
| |
| return; |
| } |
| |
| llvm::raw_fd_ostream *OutputFile::dup() { |
| int newfd; |
| |
| do { |
| newfd = ::dup(mFD); |
| if (newfd < 0) { |
| if (errno != EINTR) { |
| detectError(); |
| return nullptr; |
| } |
| // EINTR |
| continue; |
| } |
| // dup() returns ok. |
| break; |
| } while (true); |
| |
| llvm::raw_fd_ostream *result = |
| new (std::nothrow) llvm::raw_fd_ostream(newfd, /* shouldClose */true); |
| |
| if (result == nullptr) { |
| mError = std::make_error_code(std::errc::not_enough_memory); |
| } |
| |
| return result; |
| } |