aio_cancel — cancel an outstanding asynchronous I/O request
#include <aio.h>
int
aio_cancel( |
int | fd, |
struct aiocb * | aiocbp) ; |
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 cancelled. Otherwise, only the request described
by the control block pointed to by aiocbp
is cancelled.
Normal asynchronous notification occurs for cancelled requests. The request return status is set to −1, and the request error status is set to ECANCELED. The control block of requests that cannot be cancelled is not changed.
If aiocbp
is not
NULL, and fd
differs
from the file descriptor with which the asynchronous
operation was initiated, unspecified results occur.
Which operations are cancelable is implementation-defined.
This function returns AIO_CANCELED if all requests were
successfully cancelled. It returns AIO_NOTCANCELED when at
least one of the requests specified was not cancelled 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 when all requests had been completed
already before this call. When some error occurs, −1 is
returned, and errno
is set
appropriately.
aio_error(3), aio_fsync(3), aio_read(3), aio_return(3), aio_suspend(3), aio_write(3)
|