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/*
* Copyright (C) 2010 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 "file_linux.h"
#include <errno.h>
#include <unistd.h>
#include "logging.h"
namespace art {
LinuxFile::~LinuxFile() {
// Close the file if necessary (unless it's a standard stream).
if (auto_close_ && fd_ > STDERR_FILENO) {
Close();
}
}
void LinuxFile::Close() {
DCHECK_GT(fd_, 0);
int err = close(fd_);
if (err != 0) {
PLOG(WARNING) << "Problem closing " << name();
}
fd_ = kClosedFd;
}
bool LinuxFile::IsClosed() {
return fd_ == kClosedFd;
}
int64_t LinuxFile::Read(void* buffer, int64_t num_bytes) {
DCHECK_GE(fd_, 0);
return read(fd_, buffer, num_bytes);
}
int64_t LinuxFile::Write(const void* buffer, int64_t num_bytes) {
DCHECK_GE(fd_, 0);
return write(fd_, buffer, num_bytes);
}
off_t LinuxFile::Position() {
DCHECK_GE(fd_, 0);
return lseek(fd_, 0, SEEK_CUR);
}
off_t LinuxFile::Length() {
DCHECK_GE(fd_, 0);
off_t position = lseek(fd_, 0, SEEK_CUR);
if (position < 0) {
// The file is not capable of seeking. Return an error.
return -1;
}
off_t result = lseek(fd_, 0, SEEK_END);
lseek(fd_, position, SEEK_SET);
return result;
}
} // namespace art
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