NOPRINCIO, NOPRINCIO Unable to write to principal device
Run Time Fatal: This indicates that GT.M attempted to, but could not, READ from, or WRITE to, the principal device and therefore attempted to issue an appropriate error, for example, an IOEOF. However if the error handling does not prevent any and all subsequent READs and WRITEs to the no longer available principal device, the next subsequent I/O error shuts down the process immediately with a NOPRINCIO to prevent mysteriously lost output, or, worse, an indefinite loop.
Action: The NOPRINCIO error message is FATAL which does not drive device or trap handlers and terminates the process. This termination does not allow any application level orderly shutdown and, depending on the application may lead to out-of-design application state. Therefore FIS recommends appropriate application level error handling that recognizes the preceding error and performs an orderly shutdown without issuing any additional READ or WRITE to the principal device. The most common causes for the principal device to cease to exist involve terminal sessions or socket connections (including those from processes started by inetd/xinetd). When the remote client terminates the connection, the underlying principal device becomes inaccessible making any subsequent attempt to READ from, or WRITE to, it hopeless. In the case of terminals, a user closing the window of a session without cleanly exiting from the GT.M process sets up the case that can drive this error.
