User`s guide

4: Application Interface
DC 900-1516D 63
4.2.4 SYS$QIO(W)
To issue VMS read or write I/O calls, the client application issues the VMS SYS$QIOW
or SYS$QIO calls (for I/O with, or without wait). See the VMS system services manual
for a detailed description of
SYS$QIOW and SYS$QIO.
Synopsis
SYS$QIO(W) ( [efn], channel, function [,&iosb] [,&astadr] [,astprm],
[,p1] [,p2] [,p3] [,p4] [,p5] [,p6] )
Parameters
efn Event flag to be set on completion of I/O
channel Communication channel associated with a device
function Supported functions are described in Section 4.2.4.1 through
Section 4.2.4.7
iosb Address of the I/O Status Block (IOSB) fields to receive the I/O
completion status
astadr Address of an Asynchronous System Trap (AST) routine to be
executed on I/O completion
astprm Asynchronous System Trap (AST) parameter passed to the AST
routine on I/O completion
P1—P6 Optional device- and function-specific I/O request parameters
The ICP2432 device driver supports these function codes, described in the following
sections:
1. IO$_INITIALIZE[|IO$M_NOWAIT]
2. IO$_LOADMCODE