F$IODel

I/O Delete	Deletes an I/O module that is not being used
OS9 F$IODel 103F 33

Entry Conditions

X address of an I/O module

Exit Conditions

None

Error Output

CC carry set on error

B error code, if any

Additional Information

• The I/O Delete call deletes the specified I/O module from the system, if the module is not in use. This system call is used mainly by the I/O Manager, and can be of limited or no use for other applications.
• This is the order in which I/O Delete operates:
  1. Register X passes the address of a device descriptor module, device driver module, or file manager module.
  2. NitrOS-9 searches the device table for the address.
  3. If NitrOS-9 finds the address, it checks the module’s use count. If the count is zero, the module is not being used; NitrOS-9 deletes it. If the count is not zero, the module is being used; NitrOS-9 returns an error.
• I/O Delete returns information to the Unlink system call after determining whether a device is busy.

IOMan