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NAME
       io_cancel - Cancel an outstanding asynchronous I/O operation


SYNOPSIS
       #include <linux/aio.h>

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


DESCRIPTION
       io_cancel() attempts to cancel an asynchronous I/O operation previously
       submitted with the io_submit system call.  ctx_id is the AIO context ID
       of the operation to be cancelled.  If the AIO  context  is  found,  the
       event  will  be cancelled 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; otherwise,  it  returns  one  of  the
       errors listed in the "Errors" section.


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 cancelled.

       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).


NOTES
       The asynchronous I/O system calls were written by Benjamin LaHaise.


AUTHOR
       Kent Yoder.