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AIO_CANCEL(3)              Linux Programmer's Manual             AIO_CANCEL(3)

NAME
       aio_cancel - cancel an outstanding asynchronous I/O request

SYNOPSIS
       #include <aio.h>

       int aio_cancel(int fd, struct aiocb *aiocbp);

       Link with -lrt.

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.

       Normal asynchronous notification occurs  for  canceled  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 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 cancellable 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 when all requests had been completed
       already before this call.  When some error occurs, -1 is returned,  and
       errno is set appropriately.

ERRORS
       EBADF  fd is not a valid file descriptor.

CONFORMING TO
       POSIX.1-2001.

SEE ALSO
       aio_error(3), aio_fsync(3), aio_read(3), aio_return(3), aio_suspend(3),
       aio_write(3)

COLOPHON
       This page is part of release 3.25 of the Linux  man-pages  project.   A
       description  of  the project, and information about reporting bugs, can
       be found at http://www.kernel.org/doc/man-pages/.

                                  2003-11-14                     AIO_CANCEL(3)
 

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