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

       io_cancel - cancel an outstanding asynchronous I/O operation

       #include <libaio.h>

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

       Link with -laio.

       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.

       On success, io_cancel() returns 0.  For the failure return, see NOTES.

       EAGAIN The iocb specified was not canceled.

       EFAULT One of the data structures points to invalid data.

       EINVAL The AIO context specified by ctx_id is invalid.

       ENOSYS io_cancel() is not implemented on this architecture.

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

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

       Glibc does not provide a wrapper function for this system call.

       The  wrapper  provided in libaio for io_cancel() does not follow the usual C library conventions for indicating
       error: on error it returns a negated error number (the negative of one of the values listed in ERRORS).  If the
       system  call  is  invoked via syscall(2), then the return value follows the usual conventions for indicating an
       error: -1, with errno set to a (positive) value that indicates the error.

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

       This page is part of release 3.22 of the Linux man-pages project.  A description of the project,  and  informa-
       tion about reporting bugs, can be found at

Linux                             2008-06-18                      IO_CANCEL(2)