OpenVMS documentation

This section lists the function codes and function modifiers for the disk drivers.

Functions	Arguments	Modifiers
IO$_READVBLK IO$_READLBLK IO$_READPBLK IO$_WRITEVBLK IO$_WRITELBLK IO$_WRITEPBLK	P1 — buffer address P2 — byte count P3 — disk address	IO$M_INHSEEK^[7] IO$M_DATACHECK^[8] IO$M_DELDATA^[9] IO$M_INHRETRY IO$M_ERASE^[10]
IO$_WRITECHECK	P1 — buffer address P2 — byte count P3 — disk address	None
IO$_SENSECHAR IO$_SENSEMODE IO$_PACKACK IO$_AVAILABLE IO$_UNLOAD	None	None
IO$_SEARCH	P1 — read/write head position	None
IO$_SEEK	P1 — seek to specified cylinder	None
IO$_FORMAT^[11]	P1 — RX02 density	None
IO$_SETPRFPATH	P1 — node or HSx name	IO$_FORCEPATH
IO$_CREATE IO$_ACCESS IO$_DEACCESS IO$_MODIFY IO$_DELETE IO$_ACPCONTROL	P1 — FIB descriptor address P2 — file name string address P3 — result string length address P4 — result string descriptor address P5 — attribute list address	IO$M_CREATE IO$M_ACCESS IO$M_DELETE IO$M_DMOUNT
^[7]Only for IO$_READPBLK and IO$_WRITEPBLK (not for TU58, RX01, RX02, RB02, or RL02) ^[8]Not for RX01 and RX02 ^[9]Only for IO$_RWRITEPBLK on RX02 ^[10]Only for write functions ^[11]Not for DSA disks

HP OpenVMS Systems Documentation