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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/process.h"
#include "base/logging.h"
#include "base/memory/scoped_ptr.h"
#include "base/win/windows_version.h"
namespace base {
Process::Process(ProcessHandle handle)
: is_current_process_(false),
process_(handle) {
CHECK_NE(handle, ::GetCurrentProcess());
}
Process::Process(RValue other)
: is_current_process_(other.object->is_current_process_),
process_(other.object->process_.Take()) {
other.object->Close();
}
Process& Process::operator=(RValue other) {
if (this != other.object) {
process_.Set(other.object->process_.Take());
is_current_process_ = other.object->is_current_process_;
other.object->Close();
}
return *this;
}
// static
Process Process::Current() {
Process process;
process.is_current_process_ = true;
return process.Pass();
}
// static
bool Process::CanBackgroundProcesses() {
return true;
}
bool Process::IsValid() const {
return process_.IsValid() || is_current();
}
ProcessHandle Process::Handle() const {
return is_current_process_ ? GetCurrentProcess() : process_.Get();
}
Process Process::Duplicate() const {
if (is_current())
return Current();
ProcessHandle out_handle;
if (!IsValid() || !::DuplicateHandle(GetCurrentProcess(),
Handle(),
GetCurrentProcess(),
&out_handle,
0,
FALSE,
DUPLICATE_SAME_ACCESS)) {
return Process();
}
return Process(out_handle);
}
ProcessId Process::pid() const {
DCHECK(IsValid());
return GetProcId(Handle());
}
bool Process::is_current() const {
return is_current_process_;
}
void Process::Close() {
is_current_process_ = false;
if (!process_.IsValid())
return;
process_.Close();
}
void Process::Terminate(int result_code) {
DCHECK(IsValid());
// 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(Handle(), result_code);
}
bool Process::IsProcessBackgrounded() const {
DCHECK(IsValid());
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) {
DCHECK(IsValid());
// 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) && (is_current())) {
priority = value ? PROCESS_MODE_BACKGROUND_BEGIN :
PROCESS_MODE_BACKGROUND_END;
} else {
priority = value ? BELOW_NORMAL_PRIORITY_CLASS : NORMAL_PRIORITY_CLASS;
}
return (::SetPriorityClass(Handle(), priority) != 0);
}
int Process::GetPriority() const {
DCHECK(IsValid());
return ::GetPriorityClass(Handle());
}
} // namespace base
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