Manpages - aio_cancel.3

aio_cancel - cancel an outstanding asynchronous I/O request

  #include <aio.h>

  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 *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 the status *EINPROGRESSS.)

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.

The *aio_cancel*() function returns one of the following values:

AIO_CANCELED

All requests were successfully canceled.

AIO_NOTCANCELED

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).

AIO_ALLDONE

All requests had already been completed before the call.

-1

An error occurred. The cause of the error can be found by inspecting errno.

EBADF

fd is not a valid file descriptor.

ENOSYS

*aio_cancel*() is not implemented.

The *aio_cancel*() function is available since glibc 2.1.

For an explanation of the terms used in this section, see *attributes*(7).

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

See *aio*(7).

*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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