Cancels a queued control connection read request.
D.1.1 Format | 
  | 
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$_DEVOFFLINE | Device is off line and request cannot proceed. | 
| SS$_IVCHAN | Illegal channel. | 
| SS$_NOPRIV | Insufficient privilege to perform request. |