DESCRIPTION

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 occur.

Which operations are cancelable is implementation-defined.

RETURN VALUE

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.

ERRORS

VERSIONS

The aio_cancel() function is available since glibc 2.1.

CONFORMING TO

POSIX.1-2001, POSIX.1-2008.

EXAMPLE

See aio(7).

SEE ALSO

aio_error(3), aio_fsync(3), aio_read(3), aio_return(3), aio_suspend(3), aio_write(3), lio_listio(3), aio(7)