CMD_CLEAR

throw away internal caches

CMD_CLEAR is a standard command for multiple audio channels. For each selected channel (io_Unit), if the allocation key (ioa_AllocKey) is correct, CMD_CLEAR does nothing; otherwise, CMD_CLEAR returns an error (ADIOERR_NOALLOCATION). CMD_CLEAR is synchronous and only replies (mn_ReplyPort) if the quick flag (IOF_QUICK) is clear.

io_Device

Pointer to device node, must be set by (or copied from I/O block set by) OpenDevice function

io_Unit

Bit map of channels to clear (bits 0 thru 3 correspond to channels 0 thru 3)

io_Command

Command number for CMD_CLEAR

io_Flags

Flags, must be cleared if not used: IOF_QUICK - (CLEAR) reply I/O request

ioa_AllocKey

Allocation key, must be set by (or copied from I/O block set by) OpenDevice function or ADCMD_ALLOCATE command

io_Unit

Bit map of channels successfully cleared (bits 0 thru 3 correspond to channels 0 thru 3)

io_Error

Error number: 0 - no error ADIOERR_NOALLOCATION - allocation key (ioa_AllocKey)

does not match key for channel