AIOCANCEL(2) BSD System Calls Manual AIOCANCEL(2)

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

LLIIBBRRAARRYY
     Standard C Library (libc, -lc)

SYNOPSIS
     ##iinncclluuddee <>

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

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

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

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

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

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

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

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

EERRRROORRSS
     An error return from aaiiooccaanncceell() indicates:

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

SEE ALSO
     aioerror(2), aioread(2), aioreturn(2), aiosuspend(2), aiowrite(2),
     aio(4)

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

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

AUTHORS     This manual page was originally written by Wes Peters .
     Christopher M Sedore  updated it when
     aaiiooccaanncceell() was implemented for FreeBSD 4.0.

BSD                            January 19, 2000                            BSD