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AIO_CANCEL(3P)		   POSIX Programmer's Manual		AIO_CANCEL(3P)

       This  manual  page is part of the POSIX Programmer's Manual.  The Linux
       implementation of this interface may differ (consult the	 corresponding
       Linux  manual page for details of Linux behavior), or the interface may
       not be implemented on Linux.

       aio_cancel — cancel an asynchronous I/O request

       #include <aio.h>

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

       The aio_cancel() function shall attempt to cancel one or more asynchro‐
       nous I/O requests currently outstanding against file descriptor fildes.
       The aiocbp argument points to the asynchronous I/O control block for  a
       particular  request  to	be  canceled. If aiocbp is NULL, then all out‐
       standing cancelable asynchronous I/O requests against fildes  shall  be

       Normal asynchronous notification shall occur for asynchronous I/O oper‐
       ations that are successfully canceled. If there are requests that  can‐
       not  be canceled, then the normal asynchronous completion process shall
       take place for those requests when they are completed.

       For requested operations that are successfully canceled, the associated
       error status shall be set to [ECANCELED] and the return status shall be
       −1. For requested operations that are not  successfully	canceled,  the
       aiocbp shall not be modified by aio_cancel().

       If  aiocbp  is not NULL, then if fildes does not have the same value as
       the file descriptor with which the asynchronous	operation  was	initi‐
       ated, unspecified results occur.

       Which operations are cancelable is implementation-defined.

       The  aio_cancel()  function  shall return the value AIO_CANCELED if the
       requested operation(s) were canceled.  The value AIO_NOTCANCELED	 shall
       be  returned  if	 at  least one of the requested operation(s) cannot be
       canceled because it is in progress. In this  case,  the	state  of  the
       other operations, if any, referenced in the call to aio_cancel() is not
       indicated by the return value of	 aio_cancel().	 The  application  may
       determine   the	 state	of  affairs  for  these	 operations  by	 using
       aio_error().  The value AIO_ALLDONE is returned if all  of  the	opera‐
       tions  have already completed.  Otherwise, the function shall return −1
       and set errno to indicate the error.

       The aio_cancel() function shall fail if:

       EBADF  The fildes argument is not a valid file descriptor.

       The following sections are informative.





       aio_read(), aio_write()

       The Base Definitions volume of POSIX.1‐2008, <aio.h>

       Portions of this text are reprinted and reproduced in  electronic  form
       from IEEE Std 1003.1, 2013 Edition, Standard for Information Technology
       -- Portable Operating System Interface (POSIX),	The  Open  Group  Base
       Specifications Issue 7, Copyright (C) 2013 by the Institute of Electri‐
       cal and Electronics Engineers,  Inc  and	 The  Open  Group.   (This  is
       POSIX.1-2008  with  the	2013  Technical Corrigendum 1 applied.) In the
       event of any discrepancy between this version and the original IEEE and
       The  Open Group Standard, the original IEEE and The Open Group Standard
       is the referee document. The original Standard can be  obtained	online
       at .

       Any  typographical  or  formatting  errors that appear in this page are
       most likely to have been introduced during the conversion of the source
       files  to  man page format. To report such errors, see https://www.ker‐ .

IEEE/The Open Group		     2013			AIO_CANCEL(3P)

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