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/*
* Copyright (C) 2010 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
* THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef SharedMemory_h
#define SharedMemory_h
#include <wtf/Forward.h>
#include <wtf/Noncopyable.h>
#include <wtf/RefCounted.h>
#if USE(UNIX_DOMAIN_SOCKETS)
#include "Attachment.h"
#include <wtf/Optional.h>
#endif
namespace IPC {
class Decoder;
class Encoder;
}
#if OS(DARWIN)
namespace WebCore {
class MachSendRight;
}
#endif
namespace WebKit {
class SharedMemory : public RefCounted<SharedMemory> {
public:
enum class Protection {
ReadOnly,
ReadWrite
};
class Handle {
WTF_MAKE_NONCOPYABLE(Handle);
public:
Handle();
~Handle();
bool isNull() const;
void clear();
void encode(IPC::Encoder&) const;
static bool decode(IPC::Decoder&, Handle&);
#if USE(UNIX_DOMAIN_SOCKETS)
IPC::Attachment releaseAttachment() const;
void adoptAttachment(IPC::Attachment&&);
#endif
private:
friend class SharedMemory;
#if USE(UNIX_DOMAIN_SOCKETS)
mutable IPC::Attachment m_attachment;
#elif OS(DARWIN)
mutable mach_port_t m_port;
size_t m_size;
#endif
};
static RefPtr<SharedMemory> allocate(size_t);
static RefPtr<SharedMemory> create(void*, size_t, Protection);
static RefPtr<SharedMemory> map(const Handle&, Protection);
#if USE(UNIX_DOMAIN_SOCKETS)
static RefPtr<SharedMemory> wrapMap(void*, size_t, int fileDescriptor);
#endif
~SharedMemory();
bool createHandle(Handle&, Protection);
size_t size() const { return m_size; }
void* data() const
{
ASSERT(m_data);
return m_data;
}
// Return the system page size in bytes.
static unsigned systemPageSize();
private:
#if OS(DARWIN)
WebCore::MachSendRight createSendRight(Protection) const;
#endif
size_t m_size;
void* m_data;
#if PLATFORM(COCOA)
Protection m_protection;
#endif
#if USE(UNIX_DOMAIN_SOCKETS)
std::optional<int> m_fileDescriptor;
bool m_isWrappingMap { false };
#elif OS(DARWIN)
mach_port_t m_port;
#endif
};
};
#endif // SharedMemory_h
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