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NAME
       io_cancel - cancel an outstanding asynchronous I/O operation


SYNOPSIS
       #include <libaio.h>

       int io_cancel(aio_context_t ctx_id, struct iocb *iocb,
                     struct io_event *result);

       Link with -laio.


DESCRIPTION
       io_cancel() attempts to cancel an asynchronous I/O operation previously
       submitted with io_submit(2).  ctx_id is  the  AIO  context  ID  of  the
       operation  to be canceled.  If the AIO context is found, the event will
       be canceled and then copied  into  the  memory  pointed  to  by  result
       without being placed into the completion queue.


RETURN VALUE
       io_cancel()  returns  0  on  success; on failure, it returns one of the
       errors listed under ERRORS.


ERRORS
       EINVAL The AIO context specified by ctx_id is invalid.

       EFAULT One of the data structures points to invalid data.

       EAGAIN The iocb specified was not canceled.

       ENOSYS io_cancel() is not implemented on this architecture.


VERSIONS
       The asynchronous I/O system calls first appeared in Linux  2.5,  August
       2002.


CONFORMING TO
       io_cancel()  is  Linux-specific and should not be used in programs that
       are intended to be portable.


SEE ALSO
       io_setup(2), io_destroy(2), io_getevents(2), io_submit(2)


COLOPHON
       This page is part of release 2.77 of the Linux  man-pages  project.   A
       description  of  the project, and information about reporting bugs, can
       be found at http://www.kernel.org/doc/man-pages/.