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.
io_cancel() returns 0 on success; otherwise, it returns one of the errors listed in the "Errors" section.
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.