Section (3) aio_cancel
aio_cancel — cancel an outstanding asynchronous I/O request
|struct aiocb *aiocbp
attempts to cancel outstanding asynchronous I/O requests for
the file descriptor
aiocbp is NULL, all such
requests are canceled. Otherwise, only the request described
by the control block pointed to by
aiocbp is canceled. (See
aio(7) for a description of
the aiocb structure.)
Normal asynchronous notification occurs for canceled requests (see aio(7) and sigevent(7)). The request return status (aio_return(3)) is set to −1, and the request error status (aio_error(3)) is set to ECANCELED. The control block of requests that cannot be canceled is not changed.
If the request could not be canceled, then it will
terminate in the usual way after performing the I/O
operation. (In this case, aio_error(3) will return
aiocbp is not
from the file descriptor with which the asynchronous
operation was initiated, unspecified results occur.
Which operations are cancelable is implementation-defined.
returns one of the following values:
All requests were successfully canceled.
At least one of the requests specified was not canceled because it was in progress. In this case, one may check the status of individual requests using aio_error(3).
All requests had already been completed before the call.
An error occurred. The cause of the error can be found by inspecting
For an explanation of the terms used in this section, see attributes(7).
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