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AIO_CANCEL(2)		       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 *iocb);

DESCRIPTION
     The  aio_cancel()	system call cancels the outstanding asynchronous I/O re-
     quest for the file descriptor specified in fildes.  If iocb  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_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).

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

ERRORS
     An error return from aio_cancel() indicates:

     [EBADF]		The fildes argument is an invalid 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_can-
     cel() was implemented for FreeBSD 4.0.

FreeBSD ports 15.quarterly	January 19, 2000		   AIO_CANCEL(2)

Want to link to this manual page? Use this URL:
<https://man.freebsd.org/cgi/man.cgi?query=aio_cancel&sektion=2&manpath=FreeBSD+15.1-RELEASE+and+Ports.quarterly>

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