| 摘要 |
In a distributed network system, resilient virtual fault tolerant service sessions are conducted between a host application program and a telnet client user over an end-to-end link including a telnet server, a messaging protocol process, a network driver, and a communication link. The telnet server establishes a tty type structure in response to a service request from a telnet user/client. This invention includes a service control block which controls the establishment of a tty and associated request control blocks and buffers for processing I/O requests. The session is functionally partitioned into an upper half session involving the host application program and the telnet server, and a lower half session involving the remainder of the network components leading to the telnet client. When an interruption in a session occurs due to a fault originating in those portions of the network devoted to the lower half session, the telnet server continues to operate the upper half session by accepting I/O requests from the host application program and queueing these requests in the request control buffers, up to a maximum number of permitted queued requests. The host file system determines the handling of requests that exceed the maximum.
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