IO_CANCEL(2)                        Linux Programmer's Manual                        IO_CANCEL(2)



NAME
       io_cancel - Cancel an outstanding asynchronous I/O operation

SYNOPSIS
       #include <libaio.h>


       extern int io_cancel (io_context_t ctx, struct iocb *iocb, struct io_event *evt);


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 "Er-
       rors" 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.



Linux 2.4                                   2003-02-21                               IO_CANCEL(2)