io_setup(2) -- Linux man page
NAMEio_setup - Create an asynchronous I/O context
- int io_setup (int maxevents, io_context_t *ctxp);
io_setup creates an asynchronous I/O context capable of receiving at least maxevents. ctxp must not point to an AIO context that already exists, and must be initialized to 0 prior to the call. On successful creation of the AIO context, *ctxp is filled in with the resulting handle.
io_setup returns 0 on success; otherwise, one of the errors listed in the "Errors" section is returned.
ctxp is not initialized, or the specified maxevents
exceeds internal limits. maxevents should be greater than 0.
An invalid pointer is passed for ctxp.
Insufficient kernel resources are available.
The specified maxevents exceeds the user's limit of available events.
io_setup is not implemented on this architecture.
io_setup is Linux specific and should not be used in programs that are intended to be portable.
The asynchronous I/O system calls first appeared in Linux 2.5, August 2002.
The asynchronous I/O system calls were written by Benjamin LaHaise.