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.\" Copyright (C) 2003 Free Software Foundation, Inc.
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.\" This file is distributed according to the GNU General Public License.
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.\" See the file COPYING in the top level source directory for details.
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.\"
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.\" .IP "\\$1" \\$2
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.\" ..
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2004-11-03 13:51:07 +00:00
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.TH "IO_SETUP" 2 "2003-02-21" "Linux 2.4" "Linux Programmer's Manual"
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.SH NAME
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io_setup \- create an asynchronous I/O context
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.SH "SYNOPSIS"
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.nf
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.\" .ad l
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.\" .hy 0
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.B #include <libaio.h>
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.\" #include <linux/aio.h>
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.sp
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.\" .HP 15
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.BI "int io_setup(unsigned " nr_events ", aio_context_t *" ctxp );
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.\" .ad
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.\" .hy
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.fi
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.SH "DESCRIPTION"
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.PP
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\fBio_setup\fR() creates an asynchronous I/O context capable of receiving
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at least \fInr_events\fR.
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\fIctxp\fR must not point to an AIO context that already exists, and must
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be initialized to 0 prior to the call.
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On successful creation of the AIO context, \fI*ctxp\fR is filled in
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with the resulting handle.
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.SH "RETURN VALUE"
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.PP
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\fBio_setup\fR() returns 0 on success;
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on failure, it returns one of the errors listed under ERRORS.
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.SH "ERRORS"
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.TP
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.B EINVAL
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\fIctxp\fR is not initialized, or the specified \fInr_events\fR
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exceeds internal limits. \fInr_events\fR should be greater than 0.
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.TP
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.B EFAULT
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An invalid pointer is passed for \fIctxp\fR.
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.TP
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.B ENOMEM
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Insufficient kernel resources are available.
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.TP
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.B EAGAIN
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The specified \fInr_events\fR exceeds the user's limit of available events.
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.TP
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.B ENOSYS
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\fBio_setup\fR() is not implemented on this architecture.
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.SH "CONFORMING TO"
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.PP
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\fBio_setup\fR() is Linux specific and should not be used in programs
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that are intended to be portable.
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.SH "VERSIONS"
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.PP
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The asynchronous I/O system calls first appeared in Linux 2.5, August 2002.
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.SH "SEE ALSO"
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.PP
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\fBio_destroy\fR(2), \fBio_getevents\fR(2), \fBio_submit\fR(2),
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\fBio_cancel\fR(2).
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.\" .SH "NOTES"
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.\" .PP
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.\" The asynchronous I/O system calls were written by Benjamin LaHaise.
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.\" .SH AUTHOR
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.\" Kent Yoder.
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