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base / process / process_win.cc [blame]
// Copyright 2011 The Chromium Authors
// 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 <windows.h>
#include "base/clang_profiling_buildflags.h"
#include "base/logging.h"
#include "base/numerics/safe_conversions.h"
#include "base/process/kill.h"
#include "base/threading/thread_restrictions.h"
#include "base/trace_event/base_tracing.h"
#include "base/win/windows_version.h"
#if BUILDFLAG(CLANG_PROFILING)
#include "base/test/clang_profiling.h"
#endif
namespace {
DWORD kBasicProcessAccess =
PROCESS_TERMINATE | PROCESS_QUERY_INFORMATION | SYNCHRONIZE;
} // namespace
namespace base {
Process::Process(ProcessHandle handle)
: process_(handle), is_current_process_(false) {
CHECK_NE(handle, ::GetCurrentProcess());
}
Process::Process(Process&& other)
: process_(other.process_.release()),
is_current_process_(other.is_current_process_) {
other.Close();
}
Process::~Process() = default;
Process& Process::operator=(Process&& other) {
DCHECK_NE(this, &other);
process_.Set(other.process_.release());
is_current_process_ = other.is_current_process_;
other.Close();
return *this;
}
// static
Process Process::Current() {
Process process;
process.is_current_process_ = true;
return process;
}
// 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
bool Process::CanSetPriority() {
return true;
}
// static
void Process::TerminateCurrentProcessImmediately(int exit_code) {
#if BUILDFLAG(CLANG_PROFILING)
WriteClangProfilingProfile();
#endif
::TerminateProcess(GetCurrentProcess(), static_cast<UINT>(exit_code));
// There is some ambiguity over whether the call above can return. Rather than
// hitting confusing crashes later on we should crash right here.
ImmediateCrash();
}
bool Process::IsValid() const {
return process_.is_valid() || 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);
}
ProcessHandle Process::Release() {
if (is_current())
return ::GetCurrentProcess();
return process_.release();
}
ProcessId Process::Pid() const {
DCHECK(IsValid());
return GetProcId(Handle());
}
Time Process::CreationTime() const {
FILETIME creation_time = {};
FILETIME ignore1 = {};
FILETIME ignore2 = {};
FILETIME ignore3 = {};
if (!::GetProcessTimes(Handle(), &creation_time, &ignore1, &ignore2,
&ignore3)) {
return Time();
}
return Time::FromFileTime(creation_time);
}
bool Process::is_current() const {
return is_current_process_;
}
void Process::Close() {
is_current_process_ = false;
if (!process_.is_valid())
return;
process_.Close();
}
bool Process::Terminate(int exit_code, bool wait) const {
constexpr DWORD kWaitMs = 60 * 1000;
DCHECK(IsValid());
bool result =
::TerminateProcess(Handle(), static_cast<UINT>(exit_code)) != FALSE;
if (result) {
// The process may not end immediately due to pending I/O
if (wait && ::WaitForSingleObject(Handle(), kWaitMs) != WAIT_OBJECT_0)
DPLOG(ERROR) << "Error waiting for process exit";
Exited(exit_code);
} else {
// The process can't be terminated, perhaps because it has already exited or
// is in the process of exiting. An error code of ERROR_ACCESS_DENIED is the
// undocumented-but-expected result if the process has already exited or
// started exiting when TerminateProcess is called, so don't print an error
// message in that case.
if (GetLastError() != ERROR_ACCESS_DENIED)
DPLOG(ERROR) << "Unable to terminate process";
// A non-zero timeout is necessary here for the same reasons as above.
if (::WaitForSingleObject(Handle(), kWaitMs) == WAIT_OBJECT_0) {
DWORD actual_exit;
Exited(::GetExitCodeProcess(Handle(), &actual_exit)
? static_cast<int>(actual_exit)
: exit_code);
result = true;
}
}
return result;
}
Process::WaitExitStatus Process::WaitForExitOrEvent(
const base::win::ScopedHandle& stop_event_handle,
int* exit_code) const {
HANDLE events[] = {Handle(), stop_event_handle.get()};
DWORD wait_result =
::WaitForMultipleObjects(std::size(events), events, FALSE, INFINITE);
if (wait_result == WAIT_OBJECT_0) {
DWORD temp_code; // Don't clobber out-parameters in case of failure.
if (!::GetExitCodeProcess(Handle(), &temp_code))
return Process::WaitExitStatus::FAILED;
if (exit_code)
*exit_code = static_cast<int>(temp_code);
Exited(static_cast<int>(temp_code));
return Process::WaitExitStatus::PROCESS_EXITED;
}
if (wait_result == WAIT_OBJECT_0 + 1) {
return Process::WaitExitStatus::STOP_EVENT_SIGNALED;
}
return Process::WaitExitStatus::FAILED;
}
bool Process::WaitForExit(int* exit_code) const {
return WaitForExitWithTimeout(TimeDelta::Max(), exit_code);
}
bool Process::WaitForExitWithTimeout(TimeDelta timeout, int* exit_code) const {
TRACE_EVENT0("base", "Process::WaitForExitWithTimeout");
if (!timeout.is_zero()) {
// Assert that this thread is allowed to wait below. This intentionally
// doesn't use ScopedBlockingCallWithBaseSyncPrimitives because the process
// being waited upon tends to itself be using the CPU and considering this
// thread non-busy causes more issue than it fixes: http://crbug.com/905788
internal::AssertBaseSyncPrimitivesAllowed();
}
// 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 = static_cast<int>(temp_code);
Exited(static_cast<int>(temp_code));
return true;
}
void Process::Exited(int exit_code) const {}
Process::Priority Process::GetPriority() const {
DCHECK(IsValid());
int priority = GetOSPriority();
if (priority == 0)
return Priority::kUserBlocking; // Failure case. Use default value.
if ((priority == BELOW_NORMAL_PRIORITY_CLASS) ||
(priority == IDLE_PRIORITY_CLASS)) {
return Priority::kBestEffort;
}
PROCESS_POWER_THROTTLING_STATE power_throttling = {
.Version = PROCESS_POWER_THROTTLING_CURRENT_VERSION,
.ControlMask = 0ul,
.StateMask = 0ul,
};
const bool ret =
::GetProcessInformation(Handle(), ProcessPowerThrottling,
&power_throttling, sizeof(power_throttling));
// Return Priority::kUserVisible if EcoQoS read & write supported and level
// set.
if (ret != 0 &&
power_throttling.ControlMask ==
PROCESS_POWER_THROTTLING_EXECUTION_SPEED &&
power_throttling.StateMask == PROCESS_POWER_THROTTLING_EXECUTION_SPEED) {
return Priority::kUserVisible;
}
return Priority::kUserBlocking;
}
bool Process::SetPriority(Priority priority) {
DCHECK(IsValid());
// Having a process remove itself from background mode is a potential
// priority inversion, and having a process put itself in background mode is
// broken in Windows 11 22H2. So, it is no longer supported. See
// https://crbug.com/1396155 for details.
DCHECK(!is_current());
const DWORD priority_class = priority == Priority::kBestEffort
? IDLE_PRIORITY_CLASS
: NORMAL_PRIORITY_CLASS;
auto* os_info = base::win::OSInfo::GetInstance();
if (os_info->version() >= win::Version::WIN11) {
PROCESS_POWER_THROTTLING_STATE power_throttling;
RtlZeroMemory(&power_throttling, sizeof(power_throttling));
power_throttling.Version = PROCESS_POWER_THROTTLING_CURRENT_VERSION;
// EcoQoS is a Windows 11 only feature, but before 22H2, there is no way to
// query its current QoS state, GetProcessInformation API to read
// PROCESS_POWER_THROTTLING_STATE would fail. For kUserVisible, we
// intentionally exclude clients before 22H2 so that GetPriority() is
// consistent with SetPriority().
if (priority == Priority::kBestEffort ||
(priority == Priority::kUserVisible &&
os_info->version() >= win::Version::WIN11_22H2)) {
// Sets Eco QoS level.
power_throttling.ControlMask = PROCESS_POWER_THROTTLING_EXECUTION_SPEED;
power_throttling.StateMask = PROCESS_POWER_THROTTLING_EXECUTION_SPEED;
} else {
// Uses system default.
power_throttling.ControlMask = 0;
power_throttling.StateMask = 0;
}
bool ret =
::SetProcessInformation(Handle(), ProcessPowerThrottling,
&power_throttling, sizeof(power_throttling));
if (ret == 0) {
DPLOG(ERROR) << "Setting process QoS policy fails";
}
}
return (::SetPriorityClass(Handle(), priority_class) != 0);
}
int Process::GetOSPriority() const {
DCHECK(IsValid());
return static_cast<int>(::GetPriorityClass(Handle()));
}
} // namespace base