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-.TH io_cancel 2 2002-09-03 "Linux 2.4" "Linux AIO"
-.SH NAME
-io_cancel \- Cancel io requests
-.SH SYNOPSIS
-.nf
-.B #include <errno.h>
-.sp
-.br
-.B #include <libaio.h>
-.sp
-.br
-.BI "int io_cancel(io_context_t ctx, struct iocb *iocb)"
-.br
-.sp
-struct iocb {
-	void		*data; /* Return in the io completion event */
-	unsigned	key;	/* For use in identifying io requests */
-	short		aio_lio_opcode;
-	short		aio_reqprio; 	/* Not used */
-	int		aio_fildes;
-};
-.fi
-.SH DESCRIPTION
-Attempts to cancel an iocb previously passed to io_submit.  If
-the operation is successfully cancelled, the resulting event is
-copied into the memory pointed to by result without being placed
-into the completion queue.
-.PP
-When one or more requests are asynchronously processed, it might be
-useful in some situations to cancel a selected operation, e.g., if it
-becomes obvious that the written data is no longer accurate and would
-have to be overwritten soon.  As an example, assume an application, which
-writes data in files in a situation where new incoming data would have
-to be written in a file which will be updated by an enqueued request.
-.SH "RETURN VALUES"
-0 is returned on success , otherwise returns Errno.
-.SH ERRORS
-.TP
-.B EFAULT 
-If any of the data structures pointed to are invalid.
-.TP
-.B EINVAL 
-If aio_context specified by ctx_id is
-invalid.  
-.TP
-.B EAGAIN
-If the iocb specified was not
-cancelled.  
-.TP
-.B ENOSYS 
-if not implemented.
-.SH "SEE ALSO"
-.BR io(3),
-.BR io_fsync(3),
-.BR io_getevents(3),
-.BR io_prep_fsync(3),
-.BR io_prep_pread(3),
-.BR io_prep_pwrite(3),
-.BR io_queue_init(3),
-.BR io_queue_release(3),
-.BR io_queue_run(3),
-.BR io_queue_wait(3),
-.BR io_set_callback(3),
-.BR io_submit(3),
-.BR errno(3)