aio_cancel - cancel an outstanding asynchronous I/O request

       For an explanation of the terms used in this section, see attributes(7).
       ┌─────────────────────────────────────────────────────────────────────────────┬───────────────┬─────────┐
       │ Interface                                                                   │ Attribute     │ Value   │
       ├─────────────────────────────────────────────────────────────────────────────┼───────────────┼─────────┤
       │ aio_cancel()                                                                │ Thread safety │ MT-Safe │
       └─────────────────────────────────────────────────────────────────────────────┴───────────────┴─────────┘

       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(3type)).  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.

EBADFfd is not a valid file descriptor.

       ENOSYSaio_cancel() is not implemented.

       See aio(7).

       glibc 2.1.  POSIX.1-2001.

       Real-time library (librt, -lrt)

       aio_cancel - cancel an outstanding asynchronous I/O request

       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.

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

Linux man-pages 6.9.1                              2024-05-02                                      aio_cancel(3)

       POSIX.1-2008.

#include<aio.h>intaio_cancel(intfd,structaiocb*aiocbp);