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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this file,
* You can obtain one at http://mozilla.org/MPL/2.0/. */
#ifndef Mappable_h
#define Mappable_h
#include <optional>
#include "mozilla/RefCounted.h"
#include "Utils.h"
/**
* Helper class to mmap plain files.
*/
class Mappable : public mozilla::RefCounted<Mappable> {
public:
MOZ_DECLARE_REFCOUNTED_TYPENAME(Mappable)
~Mappable() {}
MemoryRange mmap(const void* addr, size_t length, int prot, int flags,
off_t offset);
private:
void munmap(void* addr, size_t length) { ::munmap(addr, length); }
/* Limit use of Mappable::munmap to classes that keep track of the address
* and size of the mapping. This allows to ignore ::munmap return value. */
friend class Mappable1stPagePtr;
friend class LibHandle;
public:
/**
* Indicate to a Mappable instance that no further mmap is going to happen.
*/
void finalize();
/**
* Returns the maximum length that can be mapped from this Mappable for
* offset = 0.
*/
size_t GetLength() const;
/**
* Create a Mappable instance for the given file path.
*/
static Mappable* Create(const char* path);
protected:
explicit Mappable(int fd) : fd(fd) {}
private:
/* File descriptor */
std::optional<AutoCloseFD> fd;
};
#endif /* Mappable_h */
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