int aio_cancel(int fd, struct aiocb *aiocbp);
Link with -lrt.
The aio_cancel() function attempts to cancel outstanding asynchronous
I/O requests for the file descriptor fd. If 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 ECAN-
CELED. The control block of requests that cannot be canceled is not
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 the status EINPROGRESSS.)
If aiocbp is not NULL, and fd differs from the file descriptor with
which the asynchronous operation was initiated, unspecified results
Which operations are cancelable is implementation-defined.
The aio_cancel() function 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.
-1 An error occurred. The cause of the error can be found by
EBADF fd is not a valid file descriptor.
ENOSYS aio_cancel() is not implemented.
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