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/*
* Copyright (C) 2009 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 "base/logging.h"
#include "base/unix_file/fd_file.h"
#include <errno.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
namespace unix_file {
FdFile::FdFile() : fd_(-1), auto_close_(true) {
}
FdFile::FdFile(int fd) : fd_(fd), auto_close_(true) {
}
FdFile::FdFile(int fd, const std::string& path) : fd_(fd), file_path_(path), auto_close_(true) {
CHECK_NE(0U, path.size());
}
FdFile::~FdFile() {
if (auto_close_ && fd_ != -1) {
Close();
}
}
void FdFile::DisableAutoClose() {
auto_close_ = false;
}
bool FdFile::Open(const std::string& path, int flags) {
return Open(path, flags, 0640);
}
bool FdFile::Open(const std::string& path, int flags, mode_t mode) {
CHECK_EQ(fd_, -1) << path;
fd_ = TEMP_FAILURE_RETRY(open(path.c_str(), flags, mode));
if (fd_ == -1) {
return false;
}
file_path_ = path;
return true;
}
int FdFile::Close() {
int result = TEMP_FAILURE_RETRY(close(fd_));
if (result == -1) {
return -errno;
} else {
fd_ = -1;
file_path_ = "";
return 0;
}
}
int FdFile::Flush() {
int rc = TEMP_FAILURE_RETRY(fdatasync(fd_));
return (rc == -1) ? -errno : rc;
}
int64_t FdFile::Read(char* buf, int64_t byte_count, int64_t offset) const {
int rc = TEMP_FAILURE_RETRY(pread64(fd_, buf, byte_count, offset));
return (rc == -1) ? -errno : rc;
}
int FdFile::SetLength(int64_t new_length) {
int rc = TEMP_FAILURE_RETRY(ftruncate64(fd_, new_length));
return (rc == -1) ? -errno : rc;
}
int64_t FdFile::GetLength() const {
struct stat s;
int rc = TEMP_FAILURE_RETRY(fstat(fd_, &s));
return (rc == -1) ? -errno : s.st_size;
}
int64_t FdFile::Write(const char* buf, int64_t byte_count, int64_t offset) {
int rc = TEMP_FAILURE_RETRY(pwrite64(fd_, buf, byte_count, offset));
return (rc == -1) ? -errno : rc;
}
int FdFile::Fd() const {
return fd_;
}
bool FdFile::IsOpened() const {
return fd_ >= 0;
}
std::string FdFile::GetPath() const {
return file_path_;
}
bool FdFile::ReadFully(void* buffer, int64_t byte_count) {
char* ptr = static_cast<char*>(buffer);
while (byte_count > 0) {
int bytes_read = TEMP_FAILURE_RETRY(read(fd_, ptr, byte_count));
if (bytes_read <= 0) {
return false;
}
byte_count -= bytes_read; // Reduce the number of remaining bytes.
ptr += bytes_read; // Move the buffer forward.
}
return true;
}
bool FdFile::WriteFully(const void* buffer, int64_t byte_count) {
const char* ptr = static_cast<const char*>(buffer);
while (byte_count > 0) {
int bytes_read = TEMP_FAILURE_RETRY(write(fd_, ptr, byte_count));
if (bytes_read < 0) {
return false;
}
byte_count -= bytes_read; // Reduce the number of remaining bytes.
ptr += bytes_read; // Move the buffer forward.
}
return true;
}
} // namespace unix_file
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