/// <summary>
/// Retrieve the UserName through PInvoke
/// </summary>
/// <param name="process"></param>
/// <returns></returns>
private static string RetrieveProcessUserName(Process process)
{
string userName = null;
#if UNIX
userName = Platform.NonWindowsGetUserFromPid(process.Id);
#else
IntPtr tokenUserInfo = IntPtr.Zero;
IntPtr processTokenHandler = IntPtr.Zero;
const uint TOKEN_QUERY = 0x0008;
try
{
do
{
int error;
if (!Win32Native.OpenProcessToken(ClrFacade.GetSafeProcessHandle(process), TOKEN_QUERY, out processTokenHandler))
{
break;
}
// Set the default length to be 256, so it will be sufficient for most cases
int tokenInfoLength = 256;
tokenUserInfo = Marshal.AllocHGlobal(tokenInfoLength);
if (!Win32Native.GetTokenInformation(processTokenHandler, Win32Native.TOKEN_INFORMATION_CLASS.TokenUser, tokenUserInfo, tokenInfoLength, out tokenInfoLength))
{
error = Marshal.GetLastWin32Error();
if (error == Win32Native.ERROR_INSUFFICIENT_BUFFER)
{
Marshal.FreeHGlobal(tokenUserInfo);
tokenUserInfo = Marshal.AllocHGlobal(tokenInfoLength);
if (!Win32Native.GetTokenInformation(processTokenHandler, Win32Native.TOKEN_INFORMATION_CLASS.TokenUser, tokenUserInfo, tokenInfoLength, out tokenInfoLength))
{
break;
}
}
else
{
break;
}
}
var tokenUser = ClrFacade.PtrToStructure <Win32Native.TOKEN_USER>(tokenUserInfo);
// Set the default length to be 256, so it will be sufficient for most cases
int userNameLength = 256, domainNameLength = 256;
var userNameStr = new StringBuilder(userNameLength);
var domainNameStr = new StringBuilder(domainNameLength);
Win32Native.SID_NAME_USE accountType;
if (!Win32Native.LookupAccountSid(null, tokenUser.User.Sid, userNameStr, ref userNameLength, domainNameStr, ref domainNameLength, out accountType))
{
error = Marshal.GetLastWin32Error();
if (error == Win32Native.ERROR_INSUFFICIENT_BUFFER)
{
userNameStr.EnsureCapacity(userNameLength);
domainNameStr.EnsureCapacity(domainNameLength);
if (!Win32Native.LookupAccountSid(null, tokenUser.User.Sid, userNameStr, ref userNameLength, domainNameStr, ref domainNameLength, out accountType))
{
break;
}
}
else
{
break;
}
}
userName = domainNameStr + "\\" + userNameStr;
} while (false);
}
catch (NotSupportedException)
{
// The Process not started yet, or it's a process from a remote machine
}
catch (InvalidOperationException)
{
// The Process has exited, Process.Handle will raise this exception
}
catch (Win32Exception)
{
// We might get an AccessDenied error
}
catch (Exception)
{
// I don't expect to get other exceptions,
}
finally
{
if (tokenUserInfo != IntPtr.Zero)
{
Marshal.FreeHGlobal(tokenUserInfo);
}
if (processTokenHandler != IntPtr.Zero)
{
Win32Native.CloseHandle(processTokenHandler);
}
}
#endif
return(userName);
}
