IOReq
An item used to communicate between a task and an I/O device.
Description
An IOReq item is used to carry information from a client task to a device in order to have the device perform some operation. Once the device is stores return information in the IOReq, and returns it to the client task.
Folio
kernel
Item Type
IOREQNODE
Create
CreateIOReq(), CreateItem()
Delete
DeleteIOReq(), DeleteItem()
Query
FindItem()
Modify
SetItemOwner(), SetItemPri()
Use
SendIO(), DoIO(), AbortIO(), WaitIO(), CheckIO()
Tags
- CREATEIOREQ_TAG_REPLYPORT
-
- (Item) Create. The item number of a message port.This is where the device will send a message whenever an I/O operation completes. This argument is optional. If you do not specify it, the device will send your task the
SIGF_IODONE signal instead of a message.
- CREATEIO_TAG_DEVICE
- (Item) Create. This specifies the item number of the device that this IOReq will be used to communicate with. This item number is obtained by calling OpenNamedDevice() or FindAndOpenNamedDevice().