mirror of
https://gitlab.winehq.org/wine/wine-gecko.git
synced 2024-09-13 09:24:08 -07:00
96 lines
2.6 KiB
C
96 lines
2.6 KiB
C
|
/* 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 mozilla_ipc_FileDescriptor_h
|
||
|
|
#define mozilla_ipc_FileDescriptor_h
|
||
|
|
|
||
|
|
#include "base/basictypes.h"
|
||
|
|
#include "base/process.h"
|
||
|
|
#include "nscore.h"
|
||
|
|
|
||
|
|
#ifdef XP_WIN
|
||
|
|
// Need the HANDLE typedef.
|
||
|
|
#include <winnt.h>
|
||
|
|
#else
|
||
|
|
#include "base/file_descriptor_posix.h"
|
||
|
|
#endif
|
||
|
|
|
||
|
|
namespace mozilla {
|
||
|
|
namespace ipc {
|
||
|
|
|
||
|
|
// This class is used by IPDL to share file descriptors across processes. When
|
||
|
|
// sending a FileDescriptor IPDL will first duplicate a platform-specific file
|
||
|
|
// handle type ('PlatformHandleType') into a handle that is valid in the other
|
||
|
|
// process. Then IPDL will convert the duplicated handle into a type suitable
|
||
|
|
// for pickling ('PickleType') and then send that through the IPC pipe. In the
|
||
|
|
// receiving process the pickled data is converted into a platform-specific file
|
||
|
|
// handle and then returned to the receiver.
|
||
|
|
//
|
||
|
|
// To use this class add 'FileDescriptor' as an argument in the IPDL protocol
|
||
|
|
// and then pass a file descriptor from C++ to the Call/Send method. The
|
||
|
|
// Answer/Recv method will receive a FileDescriptor& on which PlatformHandle()
|
||
|
|
// can be called to return the platform file handle.
|
||
|
|
class FileDescriptor
|
||
|
|
{
|
||
|
|
public:
|
||
|
|
typedef base::ProcessHandle ProcessHandle;
|
||
|
|
|
||
|
|
#ifdef XP_WIN
|
||
|
|
typedef HANDLE PlatformHandleType;
|
||
|
|
typedef HANDLE PickleType;
|
||
|
|
#else
|
||
|
|
typedef int PlatformHandleType;
|
||
|
|
typedef base::FileDescriptor PickleType;
|
||
|
|
#endif
|
||
|
|
|
||
|
|
// This should only ever be created by IPDL.
|
||
|
|
struct IPDLPrivate
|
||
|
|
{};
|
||
|
|
|
||
|
|
FileDescriptor();
|
||
|
|
|
||
|
|
FileDescriptor(PlatformHandleType aHandle)
|
||
|
|
: mHandle(aHandle)
|
||
|
|
{ }
|
||
|
|
|
||
|
|
FileDescriptor(const IPDLPrivate&, const PickleType& aPickle)
|
||
|
|
#ifdef XP_WIN
|
||
|
|
: mHandle(aPickle)
|
||
|
|
#else
|
||
|
|
: mHandle(aPickle.fd)
|
||
|
|
#endif
|
||
|
|
{ }
|
||
|
|
|
||
|
|
// Performs platform-specific actions to duplicate mHandle in the other
|
||
|
|
// process (e.g. dup() on POSIX, DuplicateHandle() on Windows). Returns a
|
||
|
|
// pickled value that can be passed to the other process via IPC.
|
||
|
|
PickleType
|
||
|
|
ShareTo(const IPDLPrivate&, ProcessHandle aOtherProcess) const;
|
||
|
|
|
||
|
|
// Tests mHandle against a well-known invalid platform-specific file handle
|
||
|
|
// (e.g. -1 on POSIX, INVALID_HANDLE_VALUE on Windows).
|
||
|
|
bool
|
||
|
|
IsValid() const;
|
||
|
|
|
||
|
|
PlatformHandleType
|
||
|
|
PlatformHandle() const
|
||
|
|
{
|
||
|
|
return mHandle;
|
||
|
|
}
|
||
|
|
|
||
|
|
bool
|
||
|
|
operator==(const FileDescriptor& aOther) const
|
||
|
|
{
|
||
|
|
return mHandle == aOther.mHandle;
|
||
|
|
}
|
||
|
|
|
||
|
|
private:
|
||
|
|
PlatformHandleType mHandle;
|
||
|
|
};
|
||
|
|
|
||
|
|
} // namespace ipc
|
||
|
|
} // namespace mozilla
|
||
|
|
|
||
|
|
#endif // mozilla_ipc_FileDescriptor_h
|