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-.\" Copyright (C) 2003 Free Software Foundation, Inc.
-.\"
-.\" SPDX-License-Identifier: GPL-1.0-or-later
-.\"
-.TH io_setup 2 2023-10-31 "Linux man-pages 6.7"
-.SH NAME
-io_setup \- create an asynchronous I/O context
-.SH LIBRARY
-Standard C library
-.RI ( libc ", " \-lc )
-.P
-Alternatively, Asynchronous I/O library
-.RI ( libaio ", " \-laio );
-see VERSIONS.
-.SH SYNOPSIS
-.nf
-.BR "#include <linux/aio_abi.h>" "          /* Defines needed types */"
-.P
-.BI "long io_setup(unsigned int " nr_events ", aio_context_t *" ctx_idp );
-.fi
-.P
-.IR Note :
-There is no glibc wrapper for this system call; see VERSIONS.
-.SH DESCRIPTION
-.IR Note :
-this page describes the raw Linux system call interface.
-The wrapper function provided by
-.I libaio
-uses a different type for the
-.I ctx_idp
-argument.
-See VERSIONS.
-.P
-The
-.BR io_setup ()
-system call
-creates an asynchronous I/O context suitable for concurrently processing
-\fInr_events\fP operations.
-The
-.I ctx_idp
-argument 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*ctx_idp\fP is filled in
-with the resulting handle.
-.SH RETURN VALUE
-On success,
-.BR io_setup ()
-returns 0.
-For the failure return, see VERSIONS.
-.SH ERRORS
-.TP
-.B EAGAIN
-The specified \fInr_events\fP exceeds the limit of available events,
-as defined in
-.I /proc/sys/fs/aio\-max\-nr
-(see
-.BR proc (5)).
-.TP
-.B EFAULT
-An invalid pointer is passed for \fIctx_idp\fP.
-.TP
-.B EINVAL
-\fIctx_idp\fP is not initialized, or the specified \fInr_events\fP
-exceeds internal limits.
-\fInr_events\fP should be greater than 0.
-.TP
-.B ENOMEM
-Insufficient kernel resources are available.
-.TP
-.B ENOSYS
-.BR io_setup ()
-is not implemented on this architecture.
-.SH VERSIONS
-glibc does not provide a wrapper for this system call.
-You could invoke it using
-.BR syscall (2).
-But instead, you probably want to use the
-.BR io_setup ()
-wrapper function provided by
-.\" http://git.fedorahosted.org/git/?p=libaio.git
-.IR libaio .
-.P
-Note that the
-.I libaio
-wrapper function uses a different type
-.RI ( "io_context_t\ *" )
-.\" But glibc is confused, since <libaio.h> uses 'io_context_t' to declare
-.\" the system call.
-for the
-.I ctx_idp
-argument.
-Note also that the
-.I libaio
-wrapper does not follow the usual C library conventions for indicating errors:
-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
-.BR syscall (2),
-then the return value follows the usual conventions for
-indicating an error: \-1, with
-.I errno
-set to a (positive) value that indicates the error.
-.SH STANDARDS
-Linux.
-.SH HISTORY
-Linux 2.5.
-.SH SEE ALSO
-.BR io_cancel (2),
-.BR io_destroy (2),
-.BR io_getevents (2),
-.BR io_submit (2),
-.BR aio (7)
-.\" .SH AUTHOR
-.\" Kent Yoder.