Fujitsu Corporation

Kazuko Watanabe

Kazunori Furukawa

A communication status confirmation system in which not only a status on call establishment or link establishment but also a communication status of actual communication in an upper layer can be simply collected in a real time is provided. A communication status confirmation system employing user data on a communication network having a plurality of data communication devices connected to a transmission path employing logical multiplexing method, wherein each of the plurality of the data communication devices comprises first means for reading logical path information of a frame of user data, second means for storing a flag set per said logical path information, and third means for reading a status of the appropriate flag from said second means, and wherein data flowing in each communication path in said communication network is confirmed according to the flag information read from said first means.

Communication status confirmation system using user data

A data processing system of client/server architecture operating on a message basis comprises client spaces capable of issuing processing requests in the form of messages, and server spaces for executing the processing as requested by checking a request code contained in the message. The request codes are previously classified into client-space dedicated codes and kernel-space dedicated codes. A message communication facility for performing message transfer between the clients and the servers includes a check function for checking whether the message originates in the kernel space when the request code contained in the message is the kernel-space dedicated code. The processing request message issued from a space other than the kernel space by using the kernel space dedicated code is rejected as an error. Security of the system can thus be assured.

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Tokyo, Japan

Kazuko Watanabe