/// <summary>
/// For each process in the system, enumerates a tuple of parent-process-id,process-id.
/// </summary>
public static IEnumerable <(int parentProcessId, int processId)> ParentChildProcessIds()
{
var procEntry = new WinAPI.PROCESSENTRY32();
procEntry.dwSize = (uint)Marshal.SizeOf(typeof(WinAPI.PROCESSENTRY32));
var handleToSnapshot = WinAPI.CreateToolhelp32Snapshot((uint)WinAPI.SnapshotFlags.Process, 0);
try
{
if (WinAPI.Process32First(handleToSnapshot, ref procEntry))
{
do
{
yield return((int)procEntry.th32ParentProcessID, (int)procEntry.th32ProcessID);
}while (WinAPI.Process32Next(handleToSnapshot, ref procEntry));
}
else
{
throw new InternalErrorException("Process enumeration failed; win32 error code: {0}".Fmt(Marshal.GetLastWin32Error()));
}
}
finally
{
WinAPI.CloseHandle(handleToSnapshot);
}
}
public static int GetParentProcessId(int id)
{
var pe32 = new WinAPI.PROCESSENTRY32
{
dwSize = (uint)Marshal.SizeOf(typeof(WinAPI.PROCESSENTRY32))
};
using (var hSnapshot = WinAPI.CreateToolhelp32Snapshot(WinAPI.SnapshotFlags.Process, (uint)id))
{
if (hSnapshot.IsInvalid)
{
throw new Win32Exception();
}
if (!WinAPI.Process32First(hSnapshot, ref pe32))
{
var errno = Marshal.GetLastWin32Error();
if (errno == WinAPI.ERROR_NO_MORE_FILES)
{
return(-1);
}
throw new Win32Exception(errno);
}
do
{
if (pe32.th32ProcessID == (uint)id)
{
return((int)pe32.th32ParentProcessID);
}
} while (WinAPI.Process32Next(hSnapshot, ref pe32));
}
return(-1);
}
/// <summary>
/// For each process in the system, enumerates a tuple of parent-process-id,process-id.
/// </summary>
public static IEnumerable<Tuple<int, int>> ParentChildProcessIds()
{
WinAPI.PROCESSENTRY32 procEntry = new WinAPI.PROCESSENTRY32();
procEntry.dwSize = (uint) Marshal.SizeOf(typeof(WinAPI.PROCESSENTRY32));
IntPtr handleToSnapshot = WinAPI.CreateToolhelp32Snapshot((uint) WinAPI.SnapshotFlags.Process, 0);
try
{
if (WinAPI.Process32First(handleToSnapshot, ref procEntry))
{
do
yield return Tuple.Create((int) procEntry.th32ParentProcessID, (int) procEntry.th32ProcessID);
while (WinAPI.Process32Next(handleToSnapshot, ref procEntry));
}
else
{
throw new RTException("Process enumeration failed; win32 error code: {0}".Fmt(Marshal.GetLastWin32Error()));
}
}
finally
{
WinAPI.CloseHandle(handleToSnapshot);
}
}
