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IO_SETUP
Section: Linux Programmer's Manual (2)
Updated: 2008-06-18
Index
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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
On success,
io_setup()
returns 0.
For the failure return, see NOTES.
ERRORS
- 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.
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.
NOTES
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.
SEE ALSO
io_cancel(2),
io_destroy(2),
io_getevents(2),
io_submit(2)
COLOPHON
This page is part of release 3.27 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/.
Index
- NAME
-
- SYNOPSIS
-
- DESCRIPTION
-
- RETURN VALUE
-
- ERRORS
-
- VERSIONS
-
- CONFORMING TO
-
- NOTES
-
- SEE ALSO
-
- COLOPHON
-
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