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// Copyright 2016 Benjamin Barenblat
//
// 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.
#ifndef POSIX_EXTRAS_H_
#define POSIX_EXTRAS_H_
#include <cerrno>
#include <stdexcept>
#include <string>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
namespace scoville {
class IoError : public std::runtime_error {
public:
IoError() : IoError(errno) {}
explicit IoError(const int number)
: std::runtime_error(Message(number)), number_(number) {}
int number() const noexcept { return number_; }
// Converts an errno into a human-readable message, a la strerror(3).
// Thread-safe.
static std::string Message(int) noexcept;
private:
int number_;
};
// RAII wrapper for Unix file descriptors.
class File {
public:
File(const char* path, int flags);
virtual ~File() noexcept;
const std::string& path() const noexcept { return path_; }
// Calls fstat(2) on the file descriptor.
struct stat Stat() const;
// Calls lstat(2) on the path relative to the file descriptor. The path must
// indeed be relative (i.e., it must not start with '/').
struct stat LinkStatAt(const char* path) const;
private:
File(const File&) = delete;
File(File&&) = delete;
void operator=(const File&) = delete;
void operator=(File&&) = delete;
std::string path_;
int fd_;
};
} // scoville
#endif // POSIX_EXTRAS_H_
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