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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/metrics/field_trial.h"
#include "base/numerics/safe_conversions.h"
#include "base/process/kill.h"
#include "base/win/windows_version.h"
namespace {
DWORD kBasicProcessAccess =
PROCESS_TERMINATE | PROCESS_QUERY_INFORMATION | SYNCHRONIZE;
} // namespace
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() {
}
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
Process Process::Open(ProcessId pid) {
return Process(::OpenProcess(kBasicProcessAccess, FALSE, pid));
}
// static
Process Process::OpenWithExtraPrivileges(ProcessId pid) {
DWORD access = kBasicProcessAccess | PROCESS_DUP_HANDLE | PROCESS_VM_READ;
return Process(::OpenProcess(access, FALSE, pid));
}
// static
Process Process::OpenWithAccess(ProcessId pid, DWORD desired_access) {
return Process(::OpenProcess(desired_access, FALSE, pid));
}
// static
Process Process::DeprecatedGetProcessFromHandle(ProcessHandle handle) {
DCHECK_NE(handle, ::GetCurrentProcess());
ProcessHandle out_handle;
if (!::DuplicateHandle(GetCurrentProcess(), handle,
GetCurrentProcess(), &out_handle,
0, FALSE, DUPLICATE_SAME_ACCESS)) {
return Process();
}
return Process(out_handle);
}
// 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();
}
bool Process::Terminate(int exit_code, bool wait) const {
DCHECK(IsValid());
bool result = (::TerminateProcess(Handle(), exit_code) != FALSE);
if (result && wait) {
// The process may not end immediately due to pending I/O
if (::WaitForSingleObject(Handle(), 60 * 1000) != WAIT_OBJECT_0)
DPLOG(ERROR) << "Error waiting for process exit";
} else if (!result) {
DPLOG(ERROR) << "Unable to terminate process";
}
return result;
}
bool Process::WaitForExit(int* exit_code) {
return WaitForExitWithTimeout(TimeDelta::FromMilliseconds(INFINITE),
exit_code);
}
bool Process::WaitForExitWithTimeout(TimeDelta timeout, int* exit_code) {
// Limit timeout to INFINITE.
DWORD timeout_ms = saturated_cast<DWORD>(timeout.InMilliseconds());
if (::WaitForSingleObject(Handle(), timeout_ms) != WAIT_OBJECT_0)
return false;
DWORD temp_code; // Don't clobber out-parameters in case of failure.
if (!::GetExitCodeProcess(Handle(), &temp_code))
return false;
if (exit_code)
*exit_code = temp_code;
return true;
}
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 {
// Experiment (http://crbug.com/458594) with using IDLE_PRIORITY_CLASS as a
// background priority for background renderers (this code path is
// technically for more than just the renderers but they're the only use
// case in practice and experimenting here direclty is thus easier -- plus
// it doesn't really hurt as above we already state our intent of using
// PROCESS_MODE_BACKGROUND_BEGIN if available which is essentially
// IDLE_PRIORITY_CLASS plus lowered IO priority). Enabled by default in the
// asbence of field trials to get coverage on the perf waterfall.
DWORD background_priority = IDLE_PRIORITY_CLASS;
base::FieldTrial* trial =
base::FieldTrialList::Find("BackgroundRendererProcesses");
if (trial && trial->group_name() == "AllowBelowNormalFromBrowser")
background_priority = BELOW_NORMAL_PRIORITY_CLASS;
priority = value ? background_priority : NORMAL_PRIORITY_CLASS;
}
return (::SetPriorityClass(Handle(), priority) != 0);
}
int Process::GetPriority() const {
DCHECK(IsValid());
return ::GetPriorityClass(Handle());
}
} // namespace base
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