A.4 Mailbox Driver
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This section lists the function codes and function modifiers for the mailbox driver.
| Functions | Arguments | Modifiers |
|---|---|---|
IO$_READVBLK IO$_READLBLK IO$_READPBLK IO$_WRITEVBLK IO$_WRITELBLK IO$_WRITEPBLK | P1 — buffer address P2 — buffer size | IO$M_NOW IO$M_NORSWAIT[22] IO$M_READERCHECK[22] IO$M_WRITERCHECK [23] IO$M_STREAM[23] |
IO$_WRITEOF | None | IO$M_NOW IO$M_READERCHECK IO$M_STREAM |
IO$_SETMODE!IO$M_READATTN IO$_SETMODE!IO$M_WRTATTN IO$_SETMODE!IO$MB_ROOM_NOTIFY | P1 — AST address P2 — AST parameter P3 — access mode | None |
IO$_SETMODE!IO$M_READERWAIT[24] IO$_SETMODE!IO$M_WRITERWAIT[24] | None | None |
IO$_SETMODE!IO$M_SETPROT | P2 — volume protection mask | None |
IO$_SENSEMODE!IO$M_READERCHECK[24] IO$_SENSEMODE!IO$M_WRITERCHECK[24] | None | None |
[22] Only for write functions [23] Only for read functions [24] VAX specific | ||
| QIO Status Returns in R0 | |||
|---|---|---|---|
SS$_ACCVIO | SS$_EXQUOTA | SS$_ILLIOFUNC | SS$INFMEM |
SS$MBFULL | SS$_MBTOOSML | SS$_NOPRIV | SS$_NORMAL |