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https://github.com/mozilla/gecko-dev.git
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127 lines
3.0 KiB
C++
127 lines
3.0 KiB
C++
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "FileDescriptor.h"
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#include "mozilla/Assertions.h"
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#include "nsDebug.h"
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#ifdef XP_WIN
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#include <windows.h>
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#include "ProtocolUtils.h"
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#define INVALID_HANDLE INVALID_HANDLE_VALUE
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#else // XP_WIN
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#include <unistd.h>
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#ifndef OS_POSIX
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#define OS_POSIX
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#endif
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#include "base/eintr_wrapper.h"
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#define INVALID_HANDLE -1
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#endif // XP_WIN
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using mozilla::ipc::FileDescriptor;
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FileDescriptor::FileDescriptor()
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: mHandle(INVALID_HANDLE), mHandleCreatedByOtherProcess(false)
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#ifdef DEBUG
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, mHandleCreatedByOtherProcessWasUsed(false)
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#endif
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{ }
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FileDescriptor::FileDescriptor(PlatformHandleType aHandle)
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: mHandle(INVALID_HANDLE), mHandleCreatedByOtherProcess(false)
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#ifdef DEBUG
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, mHandleCreatedByOtherProcessWasUsed(false)
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#endif
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{
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DuplicateInCurrentProcess(aHandle);
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}
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void
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FileDescriptor::DuplicateInCurrentProcess(PlatformHandleType aHandle)
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{
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MOZ_ASSERT_IF(mHandleCreatedByOtherProcess && IsValid(),
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mHandleCreatedByOtherProcessWasUsed);
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if (IsValid(aHandle)) {
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PlatformHandleType newHandle;
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#ifdef XP_WIN
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if (::DuplicateHandle(GetCurrentProcess(), aHandle, GetCurrentProcess(),
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&newHandle, 0, FALSE, DUPLICATE_SAME_ACCESS)) {
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#else // XP_WIN
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if ((newHandle = dup(aHandle)) != INVALID_HANDLE) {
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#endif
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mHandle = newHandle;
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return;
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}
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NS_WARNING("Failed to duplicate file handle for current process!");
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}
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mHandle = INVALID_HANDLE;
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}
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void
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FileDescriptor::CloseCurrentProcessHandle()
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{
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MOZ_ASSERT_IF(mHandleCreatedByOtherProcess && IsValid(),
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mHandleCreatedByOtherProcessWasUsed);
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// Don't actually close handles created by another process.
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if (mHandleCreatedByOtherProcess) {
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return;
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}
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if (IsValid()) {
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#ifdef XP_WIN
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if (!CloseHandle(mHandle)) {
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NS_WARNING("Failed to close file handle for current process!");
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}
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#else // XP_WIN
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HANDLE_EINTR(close(mHandle));
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#endif
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mHandle = INVALID_HANDLE;
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}
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}
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FileDescriptor::PickleType
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FileDescriptor::ShareTo(const FileDescriptor::IPDLPrivate&,
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FileDescriptor::ProcessId aTargetPid) const
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{
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PlatformHandleType newHandle;
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#ifdef XP_WIN
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if (IsValid()) {
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if (mozilla::ipc::DuplicateHandle(mHandle, aTargetPid, &newHandle, 0,
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DUPLICATE_SAME_ACCESS)) {
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return newHandle;
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}
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NS_WARNING("Failed to duplicate file handle for other process!");
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}
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return INVALID_HANDLE;
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#else // XP_WIN
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if (IsValid()) {
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newHandle = dup(mHandle);
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if (IsValid(newHandle)) {
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return base::FileDescriptor(newHandle, /* auto_close */ true);
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}
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NS_WARNING("Failed to duplicate file handle for other process!");
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}
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return base::FileDescriptor();
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#endif
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MOZ_CRASH("Must not get here!");
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}
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// static
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bool
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FileDescriptor::IsValid(PlatformHandleType aHandle)
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{
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return aHandle != INVALID_HANDLE;
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}
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