Exchange/SNA Manual

CONTROL Procedure
Exchange/SNA System Procedure Calls
5–10 104700 Tandem Computers Incorporated
End of File
The end-of-file operation ( operation = 2) signals the end of the data stream to the
host by sending a type 1 function management header with end of destination
selection (EDS) specified. This operation is usually performed at the end of each file
sent to the host or at the end of the last file in a multiple file data stream. Additionally,
the end-of-file operation transmits any records in the line server’s buffers waiting for
transmission to the host. If you do not end the last transmission to the host with an
end-of-file operation, any records in the line server waiting for transmission will not
be transmitted and the file received by the host might be incomplete.
Abort Transmission
The abort transmission operation ( operation = 13) aborts the current operation on
the specified subdevice. When a send operation is aborted, Exchange/SNA terminates
the data stream by sending to the host system a type 1 function management header
with abort destination selection (ADS) specified. When a receive operation is aborted,
Exchange/SNA responds to the next frame in the data stream from the host system
with a Request Reject Error - Break (sense data X’0811’) if PURGE ON was specified, or
with a Request Not Executable (sense data X’081C”) if PURGE OFF was specified. See
the descriptions of the ABORT command and the SET PURGE parameter in Section 3
for more information.
Stop
The stop operation ( operation = 19) aborts all operations on all subdevices, sends
the file specified in the LOGOFF configuration parameter to the host, terminates all
sessions with the host, and stops the line server. This operation is equivalent to the
Exchange/SNA STOP command.