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)