gecko/ipc/glue/FileDescriptor.cpp

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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/. */
#include "FileDescriptor.h"
#include "mozilla/Assertions.h"
#include "nsDebug.h"
#ifdef XP_WIN
#include <windows.h>
#define INVALID_HANDLE INVALID_HANDLE_VALUE
#else
#include <unistd.h>
#define INVALID_HANDLE -1
#endif
using mozilla::ipc::FileDescriptor;
FileDescriptor::FileDescriptor()
: mHandle(INVALID_HANDLE)
{ }
FileDescriptor::PickleType
FileDescriptor::ShareTo(const FileDescriptor::IPDLPrivate&,
FileDescriptor::ProcessHandle aOtherProcess) const
{
#ifdef XP_WIN
if (mHandle == INVALID_HANDLE) {
return INVALID_HANDLE;
}
PlatformHandleType newHandle;
if (!DuplicateHandle(GetCurrentProcess(), mHandle, aOtherProcess, &newHandle,
0, FALSE, DUPLICATE_SAME_ACCESS)) {
NS_WARNING("Failed to duplicate file handle!");
return INVALID_HANDLE;
}
return newHandle;
#else // XP_WIN
if (mHandle == INVALID_HANDLE) {
return base::FileDescriptor();
}
PlatformHandleType newHandle = dup(mHandle);
if (newHandle < 0) {
NS_WARNING("Failed to duplicate file descriptor!");
return base::FileDescriptor();
}
// This file descriptor must be closed once the caller is done using it, so
// pass true here for the 'auto_close' argument.
return base::FileDescriptor(newHandle, true);
#endif
MOZ_NOT_REACHED("Must not get here!");
return PickleType();
}
bool
FileDescriptor::IsValid() const
{
return mHandle != INVALID_HANDLE;
}