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aio_cancel - cancel an outstanding asynchronous I/O request
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. 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 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.
This function returns AIO_CANCELED if all requests were successfully
canceled. It returns AIO_NOTCANCELED when 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).
This function returns AIO_ALLDONE if all requests had already been
completed before this call. When some error occurs, -1 is returned,
and errno is set appropriately.
EBADF fd is not a valid file descriptor.
The aio_cancel() function is available since glibc 2.1.
aio_error(3), aio_fsync(3), aio_read(3), aio_return(3), aio_suspend(3),
aio_write(3), lio_listio(3), aio(7)
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