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// Copyright (c) 2013 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "base/process/process_handle.h"
#include <windows.h>
#include <tlhelp32.h>
#include "base/win/scoped_handle.h"
#include "base/win/windows_version.h"
namespace base {
ProcessId GetCurrentProcId() {
return ::GetCurrentProcessId();
}
ProcessHandle GetCurrentProcessHandle() {
return ::GetCurrentProcess();
}
ProcessId GetProcId(ProcessHandle process) {
if (process == base::kNullProcessHandle)
return 0;
// This returns 0 if we have insufficient rights to query the process handle.
// Invalid handles or non-process handles will cause a hard failure.
ProcessId result = GetProcessId(process);
CHECK(result != 0 || GetLastError() != ERROR_INVALID_HANDLE)
<< "process handle = " << process;
return result;
}
ProcessId GetParentProcessId(ProcessHandle process) {
ProcessId child_pid = GetProcId(process);
PROCESSENTRY32 process_entry;
process_entry.dwSize = sizeof(PROCESSENTRY32);
win::ScopedHandle snapshot(CreateToolhelp32Snapshot(TH32CS_SNAPPROCESS, 0));
if (snapshot.IsValid() && Process32First(snapshot.Get(), &process_entry)) {
do {
if (process_entry.th32ProcessID == child_pid)
return process_entry.th32ParentProcessID;
} while (Process32Next(snapshot.Get(), &process_entry));
}
// TODO(zijiehe): To match other platforms, -1 (UINT32_MAX) should be returned
// if |child_id| cannot be found in the |snapshot|.
return 0u;
}
} // namespace base
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