Batch files can not supress "terminate job" - windows

Question

Im trying to open a 2nd batch file and detect if it normally exited or closed by a user (ctrl+c or x or window termiate etc..)
so Im using this following example by Batch run script when closed
#Echo off
set errorlevel=1
start /w %comspec% /c "mode 70,10&title Folder Confirmation Box&color 1e&echo.&echo. Else the close window&pause>NUL&exit 12345"
echo %errorlevel%
pause
Im trying to keep 1st batch waiting (/W) since I will check for errorlevel later on
But after closing the 2nd batch file I get an error like ^cterminate batch job (Y/N)?
I tried the suggestion over https://superuser.com/questions/35698/how-to-supress-terminate-batch-job-y-n-confirmation
with the script
rem Bypass "Terminate Batch Job" prompt.
if "%~2"=="-FIXED_CTRL_C" (
REM Remove the -FIXED_CTRL_C parameter
SHIFT
) ELSE (
REM Run the batch with <NUL and -FIXED_CTRL_C
CALL <NUL %1 -FIXED_CTRL_C %*
GOTO :EOF
)
That works quite fine
So is there a way of starting from same batch file and avoiding the terminating?
Or do I have to create a new batch from same batch and call it?
(I don't want them to see the file aswell)

Answer 1

Do not assign values to a volatile environment variable like errorlevel using set command. Doing that causes it becomes unvolatile in current context.
Always use title in START "title" [/D path] [options] "command" [parameters].
start "" /W cmd /c "anycommand&exit /B 12345" always returns 12345 exit code. It's because all the cmd line with & concatenated commands is prepared in parsing time (the same as a command block enclosed in parentheses) and then run entirely, indivisibly. Omit &exit /B 12345 to get proper exit code from anycommand, or replace it with something like start "" /W cmd /c "anycommand&&exit /B 12345||exit /B 54321" to get only success/failure indication.
Next code snippet could help:
#ECHO OFF
SETLOCAL enableextensions
set "_command=2nd_batch_file.bat"
:: for debugging purposes
set "_command=TIMEOUT /T 10 /NOBREAK"
:: raise errorlevel 9009 as a valid file name can't contain a vertical line
invalid^|command>nul 2>&1
echo before %errorlevel%
start "" /w %comspec% /C "mode 70,10&title Folder Confirmation Box&color 1e&echo(&echo( Else the close window&%_command%"
echo after %errorlevel%
Output shows sample %_command% exit codes: 0 or 1 if came to an end properly but -1073741510 if terminated forceably by Ctrl+C or Ctrl+Break or red ×
==>D:\bat\SO\31866091.bat<nul
before 9009
after 0
==>D:\bat\SO\31866091.bat<nul
before 9009
after 1
==>D:\bat\SO\31866091.bat<nul
before 9009
^CTerminate batch job (Y/N)?
after -1073741510
==>

Answer 2

This works for me:
call :runme start /w "Child Process" %comspec% /c "child.bat & exit 12345" <NUL >NUL 2>NUL
echo %ERRORLEVEL%
goto :eof
:runme
%*
goto :eof
The idea is to call a subroutine in the current script rather than calling out to an external script. You can still redirect input and output for a subroutine call.