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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/Noncopyable.h>
#include <wtf/PassRefPtr.h>
#include <wtf/RefCounted.h>
#if PLATFORM(QT) || PLATFORM(GTK) || PLATFORM(EFL)
#include "Attachment.h"
#include <wtf/text/WTFString.h>
#endif
namespace CoreIPC {
class ArgumentDecoder;
class ArgumentEncoder;
}
namespace WebKit {
class SharedMemory : public RefCounted<SharedMemory> {
public:
enum Protection {
ReadOnly,
ReadWrite
};
class Handle {
WTF_MAKE_NONCOPYABLE(Handle);
public:
Handle();
~Handle();
bool isNull() const;
void encode(CoreIPC::ArgumentEncoder&) const;
static bool decode(CoreIPC::ArgumentDecoder&, Handle&);
#if USE(UNIX_DOMAIN_SOCKETS)
CoreIPC::Attachment releaseToAttachment() const;
void adoptFromAttachment(int fileDescriptor, size_t);
#endif
private:
friend class SharedMemory;
#if OS(DARWIN)
mutable mach_port_t m_port;
#elif OS(WINDOWS)
mutable HANDLE m_handle;
#elif USE(UNIX_DOMAIN_SOCKETS)
mutable int m_fileDescriptor;
#endif
size_t m_size;
};
// Create a shared memory object with the given size. Will return 0 on failure.
static PassRefPtr<SharedMemory> create(size_t);
// Create a shared memory object from the given handle and the requested protection. Will return 0 on failure.
static PassRefPtr<SharedMemory> create(const Handle&, Protection);
// Create a shared memory object with the given size by vm_copy'ing the given buffer.
// Will return 0 on failure.
static PassRefPtr<SharedMemory> createFromVMBuffer(void*, size_t);
#if OS(WINDOWS)
static PassRefPtr<SharedMemory> adopt(HANDLE, size_t, Protection);
#endif
~SharedMemory();
bool createHandle(Handle&, Protection);
size_t size() const { return m_size; }
void* data() const { return m_data; }
#if OS(WINDOWS)
HANDLE handle() const { return m_handle; }
#endif
// Creates a copy-on-write copy of the first |size| bytes.
PassRefPtr<SharedMemory> createCopyOnWriteCopy(size_t) const;
// Return the system page size in bytes.
static unsigned systemPageSize();
private:
size_t m_size;
void* m_data;
bool m_shouldVMDeallocateData;
#if OS(DARWIN)
mach_port_t m_port;
#elif OS(WINDOWS)
HANDLE m_handle;
#elif USE(UNIX_DOMAIN_SOCKETS)
int m_fileDescriptor;
#endif
};
};
#endif // SharedMemory_h
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