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+.\" Copyright (C) 2003 Free Software Foundation, Inc.
+.\" This file is distributed according to the GNU General Public License.
+.\" See the file COPYING in the top level source directory for details.
+.\"
+.de Sh \" Subsection
+.br
+.if t .Sp
+.ne 5
+.PP
+\fB\\$1\fR
+.PP
+..
+.de Sp \" Vertical space (when we can't use .PP)
+.if t .sp .5v
+.if n .sp
+..
+.de Ip \" List item
+.br
+.ie \\n(.$>=3 .ne \\$3
+.el .ne 3
+.IP "\\$1" \\$2
+..
+.TH "IO_SETUP" 2 "2003-02-21" "Linux 2.4" "Linux Programmer's Manual"
+.SH NAME
+io_setup \- Create an asynchronous I/O context
+.SH "SYNOPSIS"
+.ad l
+.hy 0
+
+#include <linux/aio.h>
+.sp
+.HP 15
+long\ \fBio_setup\fR\ (unsigned\ \fInr_events\fR, aio_context_t\ \fI*ctxp\fR);
+.ad
+.hy
+
+.SH "DESCRIPTION"
+
+.PP
+\fBio_setup\fR creates an asynchronous I/O context capable of receiving
+at least \fInr_events\fR.
+\fIctxp\fR 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, \fI*ctxp\fR is filled in
+with the resulting handle.
+
+.SH "RETURN VALUE"
+
+.PP
+\fBio_setup\fR returns 0 on success; otherwise, one of the errors
+listed in the "Errors" section is returned.
+
+.SH "ERRORS"
+
+.TP
+EINVAL
+\fIctxp\fR is not initialized, or the specified \fInr_events\fR
+exceeds internal limits. \fInr_events\fR should be greater than 0.
+
+.TP
+EFAULT
+An invalid pointer is passed for \fIctxp\fR.
+
+.TP
+ENOMEM
+Insufficient kernel resources are available.
+
+.TP
+EAGAIN
+The specified \fInr_events\fR exceeds the user's limit of available events.
+
+.TP
+ENOSYS
+\fBio_setup\fR is not implemented on this architecture.
+
+.SH "CONFORMING TO"
+
+.PP
+\fBio_setup\fR is Linux specific and should not be used in programs
+that are intended to be portable.
+
+.SH "VERSIONS"
+
+.PP
+The asynchronous I/O system calls first appeared in Linux 2.5, August 2002.
+
+.SH "SEE ALSO"
+
+.PP
+\fBio_destroy\fR(2), \fBio_getevents\fR(2), \fBio_submit\fR(2), \fBio_cancel\fR(2).
+
+.SH "NOTES"
+
+.PP
+The asynchronous I/O system calls were written by Benjamin LaHaise.
+
+.SH AUTHOR
+Kent Yoder.