CMD_UPDATE

write out the track buffer if it is dirty.

The trackfile device does not write data sectors unless it is necessary (you request that a different track be used) or until the user requests that an update be performed. This improves system speed by caching disk operations. This command ensures that any buffered data is flushed out to the disk. If the track buffer has not been changed since the track was read in, this command does nothing.

io_Device

preset by the call to OpenDevice()

io_Unit

preset by the call to OpenDevice()

io_Command

CMD_UPDATE

io_Flags

0

io_Error

0 for success, or an error code as defined in <devices/trackdisk.h> or <exec/errors.h>

CMD_WRITE