====== Function Calls ======


----

I/O operations use the following calls. See [[:documentation:development:opera:pf25:ppgfldr:pgsfldr:spr:01spr#xref17318|Kernel Folio Calls]], in the //3DO System Programmer's Reference// for complete details on these calls.

===== Opening and Closing Devices =====

The following calls open and close devices:

  * ''%%CloseNamedDevice() %%''Closes a device previously opened with ''%%OpenNamedDevice()%%''.
  * ''%%FindDevice() %%''Returns the item number of a device.
  * ''%%FindAndOpenDevice() %%''Finds and opens a device item.
  * ''%%OpenNamedDevice() %%''Opens a named device.

===== Creating, Deleting, and Creating Pointers for IOReqs =====

The following calls handle IO requests:''%% %%''

  * ''%%CreateIOReq() %%''Creates an I/O request.
  * ''%%DeleteIOReq() %%''Deletes an I/O request.
  * ''%%LookupItem() %%''Gets a pointer to an item.

===== Controlling the I/O Process =====

The following calls handle I/O processes:

  * ''%%AbortIO() %%''Aborts an I/O operation.
  * ''%%CheckIO() %%''Checks if an asynchronous I/O request has completed.
  * ''%%DoIO() %%''Performs synchronous I/O.
  * ''%%SendIO() %%''Requests asynchronous I/O.
  * ''%%WaitIO() %%''Waits for an asynchronous I/O request to complete.