IO_SETUP(2)

NAME
io_setup - create an asynchronous I/O context

SYNOPSIS
#include <libaio.h>

int io_setup(unsigned nr_events, aio_context_t *ctxp);

Link with -laio.

DESCRIPTION

io_setup() creates an asynchronous I/O context capable of receiving at least nr_events. 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.

RETURN VALUE

io_setup() returns 0 on success; on failure, it returns one of the errors listed under ERRORS.

ERRORS

EINVAL
    ctxp is not initialized, or the specified nr_events exceeds internal limits. nr_events should be greater than 0.

EFAULT
    An invalid pointer is passed for ctxp.

ENOMEM
    Insufficient kernel resources are available.

EAGAIN
    The specified nr_events exceeds the user's limit of available events.

ENOSYS
    io_setup() is not implemented on this architecture.

VERSIONS

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

CONFORMING TO

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

SEE ALSO

io_destroy(2), io_getevents(2), io_submit(2), io_cancel(2)