HP OpenVMS I/O User’s Reference Manual: OpenVMS Version 8.4 > Appendix D Control Connection Routines

D.1 PTD$CANCEL — Cancel Queued Request

Cancels a queued control connection read request.

D.1.1 Format

PTD$CANCEL chan

D.1.2 Returns

OpenVMS usage:

cond_value

type:

longword (unsigned)

access:

write only

mechanism:

by value

D.1.3 Arguments

chan

OpenVMS usage:

channel

type:

word (unsigned)

access:

read only

mechanism:

by value

Number of the I/O channel assigned to the pseudoterminal. This channel is only intended to be sued for PTD$XXX operations.

D.1.4 Return Values

SS$_NORMAL

Normal successful completion.
SS$_DEVOFFLINEDevice is off line and request cannot proceed.
SS$_IVCHANIllegal channel.
SS$_NOPRIVInsufficient privilege to perform request.