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// Copyright (c) 2011 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.h"
#include "base/logging.h"
#include "base/memory/scoped_ptr.h"
#include "base/process_util.h"
#include "base/win/windows_version.h"
namespace base {
void Process::Close() {
if (!process_)
return;
// Don't call CloseHandle on a pseudo-handle.
if (process_ != ::GetCurrentProcess())
::CloseHandle(process_);
process_ = NULL;
}
void Process::Terminate(int result_code) {
if (!process_)
return;
// Call NtTerminateProcess directly, without going through the import table,
// which might have been hooked with a buggy replacement by third party
// software. http://crbug.com/81449.
HMODULE module = GetModuleHandle(L"ntdll.dll");
typedef UINT (WINAPI *TerminateProcessPtr)(HANDLE handle, UINT code);
TerminateProcessPtr terminate_process = reinterpret_cast<TerminateProcessPtr>(
GetProcAddress(module, "NtTerminateProcess"));
terminate_process(process_, result_code);
}
bool Process::IsProcessBackgrounded() const {
if (!process_)
return false; // Failure case.
DWORD priority = GetPriority();
if (priority == 0)
return false; // Failure case.
return ((priority == BELOW_NORMAL_PRIORITY_CLASS) ||
(priority == IDLE_PRIORITY_CLASS));
}
bool Process::SetProcessBackgrounded(bool value) {
if (!process_)
return false;
// Vista and above introduce a real background mode, which not only
// sets the priority class on the threads but also on the IO generated
// by it. Unfortunately it can only be set for the calling process.
DWORD priority;
if ((base::win::GetVersion() >= base::win::VERSION_VISTA) &&
(process_ == ::GetCurrentProcess())) {
priority = value ? PROCESS_MODE_BACKGROUND_BEGIN :
PROCESS_MODE_BACKGROUND_END;
} else {
priority = value ? BELOW_NORMAL_PRIORITY_CLASS : NORMAL_PRIORITY_CLASS;
}
return (::SetPriorityClass(process_, priority) != 0);
}
ProcessId Process::pid() const {
if (process_ == 0)
return 0;
return GetProcId(process_);
}
bool Process::is_current() const {
return process_ == GetCurrentProcess();
}
// static
Process Process::Current() {
return Process(::GetCurrentProcess());
}
// static
bool Process::CanBackgroundProcesses() {
return true;
}
int Process::GetPriority() const {
DCHECK(process_);
return ::GetPriorityClass(process_);
}
} // namespace base
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