TD_ADDCHANGEINT

add a disk change software interrupt handler.

This command lets you add a software interrupt handler to the disk device that gets invoked whenever a disk insertion or removal occurs.

You must pass in a properly initialized Exec Interrupt structure and be prepared to deal with disk insertions/removals immediately. From within the interrupt handler, you may only call the status commands that can use IOF_QUICK.

To set up the handler, an Interrupt structure must be initialized. This structure is supplied as the io_Data to the TD_ADDCHANGEINT command. The handler then gets linked into the handler chain and gets invoked whenever a disk change happens. You must eventually remove the handler before you exit.

This command only returns when the handler is removed. That is, the device holds onto the IO request until the TD_REMCHANGEINT command is executed with that same IO request. Hence, you must use SendIO() with this command.

io_Device

preset by the call to OpenDevice()

io_Unit

preset by the call to OpenDevice()

io_Command

TD_ADDCHANGEINT

io_Flags

0

io_Length

sizeof(struct Interrupt)

io_Data

pointer to Interrupt structure

io_Error

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

TD_REMCHANGEINT, <devices/trackdisk.h>, <exec/interrupts.h>, exec.library/Cause()