Action upon Detection of a Fatal Error

The user can determine what happens in the case of a fatal error by setting environment variables. If a process encounters a fatal error in the DD code, it executes the routine dd_error_inv().

• If the environment variable DD_ERROR_GARBAGE_D is set, then only the garbage demon will execute the error handlers.
• If the environment variable DD_ERROR_MSG points to an executable, then a process is execlp. Currently this is a X11 window telling the user to close the DD system.
• If the environment variable DD_ERROR_SD is set, then the DD system is closed down automatically.