Specifications

System Macros Invoked by Drivers
REQCOM
REQCOM
Invokes system device-independent I/O postprocessing.
Format
REQCOM
Description
The REQCOM macro calls IOC$REQCOM to complete the processing of an I/O
request after the driver has finished its portion of the processing.
When the REQCOM macro is invoked, the following registers must contain the
following values:
Register Contents
R0 First longword of I/O status
R1 Second longword of I/O status
R5 Address of UCB
The REQCOM macro destroys the contents of R0 through R3. All other registers
are also destroyed if the action of the macro initiates the processing of a waiting
I/O request for the device.
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