|long io_cancel (aio_context_t ctx_id, struct iocb *iocb, struct io_event *result);|
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 yiibaied to by result without being placed into the completion queue.
io_cancel() returns 0 on success; otherwise, it returns one of the errors listed in the "Errors" section.
The AIO context specified by ctx_id is invalid.
One of the data structures yiibais to invalid data.
The iocb specified was not cancelled.
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.
io_setup(2), io_destroy(2), io_getevents(2), io_submit(2).
The asynchronous I/O system calls were written by Benjamin LaHaise.