$QIO

   Queues an I/O request to a channel associated with a device. This
   service completes asynchronously; for synchronous completion, use
   the Queue I/O Request and Wait ($QIOW) service.

   Format

     SYS$QIO  [efn] ,chan ,func ,[iosb] ,[astadr] ,[astprm] ,[p1]

              ,[p2] ,[p3] ,[p4] ,[p5] ,[p6]

   C Prototype

     int sys$qio  (unsigned int efn, unsigned short int chan,

                  unsigned int func, struct _iosb *iosb, void

                  (*astadr)(__unknown_params), __int64  astprm, void

                  *p1, __int64 p2, __int64  p3, __int64 p4, __int64

                  p5, __int64 p6);
 

Additional information available:

Arguments