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AIO_CANCEL(2)                              BSD System Calls Manual                             AIO_CANCEL(2)

NAME
     aio_cancel -- cancel an outstanding asynchronous I/O operation (REALTIME)

LIBRARY
     Standard C Library (libc, -lc)

SYNOPSIS
     #include <aio.h>

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

DESCRIPTION
     The aio_cancel() system call cancels the outstanding asynchronous I/O request for the file descriptor
     specified in fildes.  If aiocbp is specified, only that specific asynchronous I/O request is cancelled.

     Normal asynchronous notification occurs for cancelled requests.  Requests complete with an error result
     of ECANCELED.

RESTRICTIONS
     The aio_cancel() system call does not cancel asynchronous I/O requests for raw disk devices.  The
     aio_cancel() system call will always return AIO_NOTCANCELED for file descriptors associated with raw
     disk devices.

RETURN VALUES
     The aio_cancel() system call returns -1 to indicate an error, or one of the following:

     [AIO_ALLDONE]
                   All of the requests meeting the criteria have finished.

     [AIO_CANCELED]
                   All outstanding requests meeting the criteria specified were cancelled.

     [AIO_NOTCANCELED]
                   Some requests were not cancelled, status for the requests should be checked with
                   aio_error(2).

ERRORS
     An error return from aio_cancel() indicates:

     [EBADF]            The fildes argument is not a valid file descriptor.

SEE ALSO
     aio_error(2), aio_read(2), aio_return(2), aio_suspend(2), aio_write(2), aio(4)

STANDARDS
     The aio_cancel() system call is expected to conform to the IEEE Std 1003.1 (``POSIX.1'') standard.

HISTORY
     The aio_cancel() system call first appeared in FreeBSD 3.0.  The first functional implementation of
     aio_cancel() appeared in FreeBSD 4.0.

AUTHORS
     This manual page was originally written by Wes Peters <wes@softweyr.com>.  Christopher M Sedore
     <cmsedore@maxwell.syr.edu> updated it when aio_cancel() was implemented for FreeBSD 4.0.

BSD                                           January 19, 2000                                           BSD