| // |
| // Copyright (C) 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 "update_engine/file_descriptor.h" |
| |
| #include <fcntl.h> |
| #include <sys/stat.h> |
| #include <sys/types.h> |
| |
| #include <base/posix/eintr_wrapper.h> |
| |
| namespace chromeos_update_engine { |
| |
| bool EintrSafeFileDescriptor::Open(const char* path, int flags, mode_t mode) { |
| CHECK_EQ(fd_, -1); |
| return ((fd_ = HANDLE_EINTR(open(path, flags, mode))) >= 0); |
| } |
| |
| bool EintrSafeFileDescriptor::Open(const char* path, int flags) { |
| CHECK_EQ(fd_, -1); |
| return ((fd_ = HANDLE_EINTR(open(path, flags))) >= 0); |
| } |
| |
| ssize_t EintrSafeFileDescriptor::Read(void* buf, size_t count) { |
| CHECK_GE(fd_, 0); |
| return HANDLE_EINTR(read(fd_, buf, count)); |
| } |
| |
| ssize_t EintrSafeFileDescriptor::Write(const void* buf, size_t count) { |
| CHECK_GE(fd_, 0); |
| |
| // Attempt repeated writes, as long as some progress is being made. |
| char* char_buf = const_cast<char*>(reinterpret_cast<const char*>(buf)); |
| ssize_t written = 0; |
| while (count > 0) { |
| ssize_t ret = HANDLE_EINTR(write(fd_, char_buf, count)); |
| |
| // Fail on either an error or no progress. |
| if (ret <= 0) |
| return (written ? written : ret); |
| written += ret; |
| count -= ret; |
| char_buf += ret; |
| } |
| return written; |
| } |
| |
| off64_t EintrSafeFileDescriptor::Seek(off64_t offset, int whence) { |
| CHECK_GE(fd_, 0); |
| return lseek64(fd_, offset, whence); |
| } |
| |
| bool EintrSafeFileDescriptor::Close() { |
| CHECK_GE(fd_, 0); |
| if (IGNORE_EINTR(close(fd_))) |
| return false; |
| Reset(); |
| return true; |
| } |
| |
| void EintrSafeFileDescriptor::Reset() { |
| fd_ = -1; |
| } |
| |
| } // namespace chromeos_update_engine |