aio_cancel(3) - NetBSD Manual Pages

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AIO_CANCEL(3)           NetBSD Library Functions Manual          AIO_CANCEL(3)


NAME

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


LIBRARY

     POSIX Real-time Library (librt, -lrt)


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 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.


RETURN VALUES

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

     [AIO_CANCELED]     All outstanding requests meeting the criteria speci-
                        fied were cancelled.

     [AIO_NOTCANCELED]  Some requests were not cancelled, status for the
                        requests should be checked with aio_error(3).

     [AIO_ALLDONE]      All of the requests meeting the criteria have fin-
                        ished.


ERRORS

     An error return from aio_cancel() indicates:

     [EBADF]            The fildes argument is an invalid file descriptor.


SEE ALSO

     aio(3)


STANDARDS

     The aio_cancel() system call is expected to conform to the IEEE Std
     1003.1-2001 (``POSIX.1'') standard.


HISTORY

     The aio_cancel() system call first appeared in NetBSD 5.0.

NetBSD 6.1.3                     May 17, 2010                     NetBSD 6.1.3