| NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | VERSIONS | CONFORMING TO | NOTES | SEE ALSO | COLOPHON | The Linux Programming Interface |
IO_SETUP(2) Linux Programmer's Manual IO_SETUP(2)
io_setup - create an asynchronous I/O context
#include <libaio.h>
int io_setup(unsigned nr_events, aio_context_t *ctxp);
Link with -laio.
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.
On success, io_setup() returns 0. For the failure return, see NOTES.
EAGAIN The specified nr_events exceeds the user's limit of available events.
EFAULT An invalid pointer is passed for ctxp.
EINVAL ctxp is not initialized, or the specified nr_events exceeds internal
limits. nr_events should be greater than 0.
ENOMEM Insufficient kernel resources are available.
ENOSYS io_setup() is not implemented on this architecture.
The asynchronous I/O system calls first appeared in Linux 2.5, August 2002.
io_setup() is Linux-specific and should not be used in programs that are
intended to be portable.
Glibc does not provide a wrapper function for this system call.
The wrapper provided in libaio for io_setup() does not follow the usual C
library conventions for indicating error: on error it returns a negated error
number (the negative of one of the values listed in ERRORS). If the system
call is invoked via syscall(2), then the return value follows the usual
conventions for indicating an error: -1, with errno set to a (positive) value
that indicates the error.
io_cancel(2), io_destroy(2), io_getevents(2), io_submit(2), aio(7)
This page is part of release 3.32 of the Linux man-pages project. A
description of the project, and information about reporting bugs, can be found
at http://www.kernel.org/doc/man-pages/.
Linux 2008-06-18 IO_SETUP(2)
HTML rendering created 2010-12-03 by Michael Kerrisk, author of The Linux Programming Interface