OSI/TS Configuration and Management Manual

NonStop Kernel File-System Interface

OSI/TS Configuration and Management Manual—424831-001

7-35

Preparing to Receive Data

If you use a WRITEREAD call to send data, OSI/TS handles your request as a

WRITE call followed by a READ call. Two distinct MCWs are used for this

procedure:

•

When you issue a WRITEREAD call, place an input MCW in the first two

octets of your buffer. OSI/TS interprets this buffer as explained above.

•

OSI/TS completes your request when it receives a data TPDU from the

remote peer. The input buffer contains an MCW, followed by remote user

data. You interpret this input MCW as described in the next subsection.

If write-count is greater than the RECEIVESIZE parameter defined for the

TSP process, file-system error 21 is returned.

Preparing to Receive Data

To receive incoming data from the OSI/TS subsystem, your application must

have an outstanding READ (or WRITEREAD) call. Issue a call with the

following syntax:

Figure 7-14. WRITE Buffer: Outgoing Data

Note. The MCW must be included in read-count and write-count.

CALL READ ( filenum, buffer, read-count );

714CDT .CDD

Octet 1

Octet 0

Octet 2

Through

Octet n

MCW

Outgoing Data

X = 0 Normal

X = 1 Expedited

Y = 0 Data Completed

Y = 1 More Data to Follow

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