public static Process ResolveParent(int processId)
{
Process process = Process.GetProcessById(processId);
ProcessUtils pbi = new ProcessUtils();
int result = NtQueryInformationProcess(process.Handle, 0, ref pbi, Marshal.SizeOf(pbi), out var returnLength);
if (result != 0)
{
throw new Win32Exception(result);
}
try
{
return(Process.GetProcessById(pbi.InheritedFromUniqueProcessId.ToInt32()));
}
catch (ArgumentException)
{
return(null);
}
}
private static extern int NtQueryInformationProcess(IntPtr processHandle, int processInformationClass, ref ProcessUtils processInformation, int processInformationLength, out int returnLength);
private static void SpawnConhostProcess(bool mute)
{
Logger.Instance.Debug($"SpawnConhostProcess starts mute={mute}");
Process cmdProcess = new Process();
cmdProcess.StartInfo.FileName = "cmd.exe";
cmdProcess.StartInfo.WindowStyle = ProcessWindowStyle.Hidden;
cmdProcess.StartInfo.Arguments = "/k timeout 1 && \x07";
if (cmdProcess.Start() == false)
{
Logger.Instance.Debug($"Can't start {cmdProcess.StartInfo.FileName} {cmdProcess.StartInfo.Arguments}");
return;
}
const int sTimeout = 3;
int conhostProcessId = 0;
Calculate(() =>
{
if (!cmdProcess.HasExited)
{
foreach (Process conhost in Process.GetProcessesByName("conhost"))
{
try
{
Process parent = ProcessUtils.ResolveParent(conhost.Id);
if (parent != null && cmdProcess.Id == parent.Id)
{
conhostProcessId = conhost.Id;
return(true);
}
}
catch (Win32Exception e)
{
Logger.Instance.Debug($"Exception with message \"{e.Message}\" on " +
$"getting process parent id for conhost process {conhost.Id}");
}
}
}
return(false);
}, new TimeSpan(0, 0, sTimeout));
if (conhostProcessId == 0)
{
Logger.Instance.Debug($"Can't find child conhost process");
return;
}
Logger.Instance.Debug($"Spawned conhost process id={conhostProcessId}. Starting muting of generated bell sound.");
Calculate(() =>
{
return(MuteProcess(conhostProcessId, true, true) != null);
}, new TimeSpan(0, 0, sTimeout));
cmdProcess.WaitForExit(2000);
Logger.Instance.Debug($"Set conhost process mute state to {mute}.");
MuteProcess(conhostProcessId, mute);
cmdProcess.Kill();
Logger.Instance.Debug($"SpawnConhostProcess finishes mute={mute}");
}