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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* 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 "mozilla/Move.h"
#include "nsDebug.h"
#ifdef XP_WIN
#include <windows.h>
#include "ProtocolUtils.h"
#define INVALID_HANDLE INVALID_HANDLE_VALUE
#else // XP_WIN
#include <unistd.h>
#ifndef OS_POSIX
#define OS_POSIX
#endif
#include "base/eintr_wrapper.h"
#define INVALID_HANDLE -1
#endif // XP_WIN
using mozilla::ipc::FileDescriptor;
FileDescriptor::FileDescriptor()
: mHandle(INVALID_HANDLE)
{
}
FileDescriptor::FileDescriptor(const FileDescriptor& aOther)
: mHandle(INVALID_HANDLE)
{
Assign(aOther);
}
FileDescriptor::FileDescriptor(FileDescriptor&& aOther)
: mHandle(INVALID_HANDLE)
{
*this = mozilla::Move(aOther);
}
FileDescriptor::FileDescriptor(PlatformHandleType aHandle)
: mHandle(INVALID_HANDLE)
{
mHandle = Clone(aHandle);
}
FileDescriptor::FileDescriptor(const IPDLPrivate&, const PickleType& aPickle)
: mHandle(INVALID_HANDLE)
{
#ifdef XP_WIN
mHandle = aPickle;
#else
mHandle = aPickle.fd;
#endif
}
FileDescriptor::~FileDescriptor()
{
Close();
}
FileDescriptor&
FileDescriptor::operator=(const FileDescriptor& aOther)
{
if (this != &aOther) {
Assign(aOther);
}
return *this;
}
FileDescriptor&
FileDescriptor::operator=(FileDescriptor&& aOther)
{
if (this != &aOther) {
Close();
mHandle = aOther.mHandle;
aOther.mHandle = INVALID_HANDLE;
}
return *this;
}
bool
FileDescriptor::IsValid() const
{
return IsValid(mHandle);
}
void
FileDescriptor::Assign(const FileDescriptor& aOther)
{
Close();
mHandle = Clone(aOther.mHandle);
}
void
FileDescriptor::Close()
{
Close(mHandle);
mHandle = INVALID_HANDLE;
}
FileDescriptor::PickleType
FileDescriptor::ShareTo(const FileDescriptor::IPDLPrivate&,
FileDescriptor::ProcessId aTargetPid) const
{
PlatformHandleType newHandle;
#ifdef XP_WIN
if (IsValid()) {
if (mozilla::ipc::DuplicateHandle(mHandle, aTargetPid, &newHandle, 0,
DUPLICATE_SAME_ACCESS)) {
return newHandle;
}
NS_WARNING("Failed to duplicate file handle for other process!");
}
return INVALID_HANDLE;
#else // XP_WIN
if (IsValid()) {
newHandle = dup(mHandle);
if (IsValid(newHandle)) {
return base::FileDescriptor(newHandle, /* auto_close */ true);
}
NS_WARNING("Failed to duplicate file handle for other process!");
}
return base::FileDescriptor();
#endif
MOZ_CRASH("Must not get here!");
}
FileDescriptor::UniquePlatformHandle
FileDescriptor::ClonePlatformHandle() const
{
return UniquePlatformHandle(Clone(mHandle));
}
bool
FileDescriptor::operator==(const FileDescriptor& aOther) const
{
return mHandle == aOther.mHandle;
}
// static
bool
FileDescriptor::IsValid(PlatformHandleType aHandle)
{
return aHandle != INVALID_HANDLE;
}
// static
FileDescriptor::PlatformHandleType
FileDescriptor::Clone(PlatformHandleType aHandle)
{
if (!IsValid(aHandle)) {
return INVALID_HANDLE;
}
FileDescriptor::PlatformHandleType newHandle;
#ifdef XP_WIN
if (::DuplicateHandle(GetCurrentProcess(), aHandle, GetCurrentProcess(),
&newHandle, 0, FALSE, DUPLICATE_SAME_ACCESS)) {
#else // XP_WIN
if ((newHandle = dup(aHandle)) != INVALID_HANDLE) {
#endif
return newHandle;
}
NS_WARNING("Failed to duplicate file handle for current process!");
return INVALID_HANDLE;
}
// static
void
FileDescriptor::Close(PlatformHandleType aHandle)
{
if (IsValid(aHandle)) {
#ifdef XP_WIN
if (!CloseHandle(aHandle)) {
NS_WARNING("Failed to close file handle for current process!");
}
#else // XP_WIN
HANDLE_EINTR(close(aHandle));
#endif
}
}
FileDescriptor::PlatformHandleHelper::PlatformHandleHelper(FileDescriptor::PlatformHandleType aHandle)
:mHandle(aHandle)
{
}
FileDescriptor::PlatformHandleHelper::PlatformHandleHelper(std::nullptr_t)
:mHandle(INVALID_HANDLE)
{
}
bool
FileDescriptor::PlatformHandleHelper::operator!=(std::nullptr_t) const
{
return mHandle != INVALID_HANDLE;
}
FileDescriptor::PlatformHandleHelper::operator FileDescriptor::PlatformHandleType () const
{
return mHandle;
}
#ifdef XP_WIN
FileDescriptor::PlatformHandleHelper::operator std::intptr_t () const
{
return reinterpret_cast<std::intptr_t>(mHandle);
}
#endif
void
FileDescriptor::PlatformHandleDeleter::operator()(FileDescriptor::PlatformHandleHelper aHelper)
{
FileDescriptor::Close(aHelper);
}
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