| 摘要 |
PURPOSE: To establish a highly reliable transmission line by outputting a cancel message to an access right receiving means in response to a safety alarm request, outputting a right receiving message to the access right receiving means and allowing a highly reliable virtual terminal to access a terminal console. CONSTITUTION: A process to be driven in a UNIX environment consists of a program text part, the data parts of processes PGM1, PGM2 and a stack part. When a user logs on a processor driving plural virtual terminals and depresses a safety alarm key (SAK), each virtual terminal in operating creats a new unbroken viritual terminal, establishes a highly reliable transmission line for the new virtual terminal, substitutes the new virtual terminal for the current virtual terminal and then drives a highly reliable process by the new vertual terminal. Consequently a highly reliable transmission line for a multi-user system in which privacy information is not stolen from a vertual terminal by a program having no receiving right can be obtained. |
