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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "mozilla/ProcInfo.h"
#include "mozilla/ipc/GeckoChildProcessHost.h"
#include "nsMemoryReporterManager.h"
#include "nsNetCID.h"
#include "nsWindowsHelpers.h"
#include <windows.h>
#include <psapi.h>
#include <tlhelp32.h>
typedef HRESULT(WINAPI* GETTHREADDESCRIPTION)(HANDLE hThread,
PWSTR* threadDescription);
namespace mozilla {
uint64_t ToNanoSeconds(const FILETIME& aFileTime) {
// FILETIME values are 100-nanoseconds units, converting
ULARGE_INTEGER usec = {{aFileTime.dwLowDateTime, aFileTime.dwHighDateTime}};
return usec.QuadPart * 100;
}
RefPtr<ProcInfoPromise> GetProcInfo(nsTArray<ProcInfoRequest>&& aRequests) {
auto holder = MakeUnique<MozPromiseHolder<ProcInfoPromise>>();
RefPtr<ProcInfoPromise> promise = holder->Ensure(__func__);
nsresult rv = NS_OK;
nsCOMPtr<nsIEventTarget> target =
do_GetService(NS_STREAMTRANSPORTSERVICE_CONTRACTID, &rv);
if (NS_FAILED(rv)) {
NS_WARNING("Failed to get stream transport service");
holder->Reject(rv, __func__);
return promise;
}
RefPtr<nsIRunnable> r = NS_NewRunnableFunction(
__func__,
[holder = std::move(holder), requests = std::move(aRequests)]() -> void {
HashMap<base::ProcessId, ProcInfo> gathered;
if (!gathered.reserve(requests.Length())) {
holder->Reject(NS_ERROR_OUT_OF_MEMORY, __func__);
return;
}
// ---- Copying data on processes (minus threads).
for (const auto& request : requests) {
nsAutoHandle handle(OpenProcess(
PROCESS_QUERY_INFORMATION | PROCESS_VM_READ, FALSE, request.pid));
if (!handle) {
// Ignore process, it may have died.
continue;
}
wchar_t filename[MAX_PATH];
if (GetProcessImageFileNameW(handle.get(), filename, MAX_PATH) == 0) {
// Ignore process, it may have died.
continue;
}
FILETIME createTime, exitTime, kernelTime, userTime;
if (!GetProcessTimes(handle.get(), &createTime, &exitTime,
&kernelTime, &userTime)) {
// Ignore process, it may have died.
continue;
}
PROCESS_MEMORY_COUNTERS memoryCounters;
if (!GetProcessMemoryInfo(handle.get(),
(PPROCESS_MEMORY_COUNTERS)&memoryCounters,
sizeof(memoryCounters))) {
// Ignore process, it may have died.
continue;
}
// Assumption: values of `pid` are distinct between processes,
// regardless of any race condition we might have stumbled upon. Even
// if it somehow could happen, in the worst case scenario, we might
// end up overwriting one process info and we might end up with too
// many threads attached to a process, as the data is not crucial, we
// do not need to defend against that (unlikely) scenario.
ProcInfo info;
info.pid = request.pid;
info.childId = request.childId;
info.type = request.processType;
info.origin = request.origin;
info.windows = std::move(request.windowInfo);
info.filename.Assign(filename);
info.cpuKernel = ToNanoSeconds(kernelTime);
info.cpuUser = ToNanoSeconds(userTime);
info.residentSetSize = memoryCounters.WorkingSetSize;
// Computing the resident unique size is somewhat tricky,
// so we use about:memory's implementation. This implementation
// uses the `HANDLE` so, in theory, should be no additional
// race condition. However, in case of error, the result is `0`.
info.residentUniqueSize =
nsMemoryReporterManager::ResidentUnique(handle.get());
if (!gathered.put(request.pid, std::move(info))) {
holder->Reject(NS_ERROR_OUT_OF_MEMORY, __func__);
return;
}
}
// ---- Add thread data to already-copied processes.
// First, we need to capture a snapshot of all the threads on this
// system.
nsAutoHandle hThreadSnap(CreateToolhelp32Snapshot(
/* dwFlags */ TH32CS_SNAPTHREAD, /* ignored */ 0));
if (!hThreadSnap) {
holder->Reject(NS_ERROR_UNEXPECTED, __func__);
return;
}
// `GetThreadDescription` is available as of Windows 10.
// We attempt to import it dynamically, knowing that it
// may be `nullptr`.
auto getThreadDescription =
reinterpret_cast<GETTHREADDESCRIPTION>(::GetProcAddress(
::GetModuleHandleW(L"Kernel32.dll"), "GetThreadDescription"));
THREADENTRY32 te32;
te32.dwSize = sizeof(THREADENTRY32);
// Now, walk through the threads.
for (auto success = Thread32First(hThreadSnap.get(), &te32); success;
success = Thread32Next(hThreadSnap.get(), &te32)) {
auto processLookup = gathered.lookup(te32.th32OwnerProcessID);
if (!processLookup) {
// Not one of the processes we're interested in.
continue;
}
ThreadInfo* threadInfo =
processLookup->value().threads.AppendElement(fallible);
if (!threadInfo) {
holder->Reject(NS_ERROR_OUT_OF_MEMORY, __func__);
return;
}
nsAutoHandle hThread(
OpenThread(/* dwDesiredAccess = */ THREAD_QUERY_INFORMATION,
/* bInheritHandle = */ FALSE,
/* dwThreadId = */ te32.th32ThreadID));
if (!hThread) {
// Cannot open thread. Not sure why, but let's erase this thread
// and attempt to find data on other threads.
processLookup->value().threads.RemoveLastElement();
continue;
}
threadInfo->tid = te32.th32ThreadID;
// Attempt to get thread times.
// If we fail, continue without this piece of information.
FILETIME createTime, exitTime, kernelTime, userTime;
if (GetThreadTimes(hThread.get(), &createTime, &exitTime, &kernelTime,
&userTime)) {
threadInfo->cpuKernel = ToNanoSeconds(kernelTime);
threadInfo->cpuUser = ToNanoSeconds(userTime);
}
// Attempt to get thread name.
// If we fail, continue without this piece of information.
if (getThreadDescription) {
PWSTR threadName = nullptr;
if (getThreadDescription(hThread.get(), &threadName) &&
threadName) {
threadInfo->name = threadName;
}
if (threadName) {
LocalFree(threadName);
}
}
}
// ----- We're ready to return.
holder->Resolve(std::move(gathered), __func__);
});
rv = target->Dispatch(r.forget(), NS_DISPATCH_NORMAL);
if (NS_FAILED(rv)) {
NS_WARNING("Failed to dispatch the LoadDataRunnable.");
}
return promise;
}
} // namespace mozilla
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