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				.\"
				.\" SPDX-License-Identifier: BSD-2-Clause-FreeBSD
				.\"
				.\" Copyright (c) 2020, Ryan Moeller <freqlabs@FreeBSD.org>
				.\"
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				.\" modification, are permitted provided that the following conditions
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				.\" 1. Redistributions of source code must retain the above copyright
				.\" notice, this list of conditions and the following disclaimer.
				.\" 2. Redistributions in binary form must reproduce the above copyright
				.\" notice, this list of conditions and the following disclaimer in the
				.\" documentation and/or other materials provided with the distribution.
				.\"
				.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
				.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
				.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
				.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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				.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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				.\" SUCH DAMAGE.
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				.\" $FreeBSD$
				.\"
				.Dd October 24, 2020
				.Dt JAIL 3lua
				.Os
				.Sh NAME
				.Nm getid ,
				.Nm getname ,
				.Nm allparams ,
				.Nm getparams ,
				.Nm setparams ,
				.Nm CREATE ,
				.Nm UPDATE ,
				.Nm ATTACH ,
				.Nm DYING
				.Nd Lua binding to
				.Xr jail 3
				.Sh SYNOPSIS
				.Bd -literal
				local jail = require('jail')
				.Ed
				.Pp
				.Bl -tag -width XXXX -compact
				.It Dv jid, err = jail.getid(name)
				.It Dv name, err = jail.getname(jid)
				.It Dv params, err = jail.allparams()
				.It Dv jid, res = jail.getparams(jid\|name, params [, flags ] )
				.It Dv jid, err = jail.setparams(jid\|name, params, flags )
				.It Dv jail.CREATE
				.It Dv jail.UPDATE
				.It Dv jail.ATTACH
				.It Dv jail.DYING
				.El
				.Sh DESCRIPTION
				The
				.Nm jail
				module is a binding to the
				.Xr jail 3
				library.
				It provides a string-oriented interface for the
				.Xr jail_get 2
				and
				.Xr jail_set 2
				system calls.
				.Bl -tag -width XXXX
				.It Dv jid, err = jail.getid(name)
				Get the jail identifier
				.Pq jid
				as an integer.
				.Fa name
				is the name of a jail or a jid in the form of a string.
				.It Dv name, err = jail.getname(jid)
				Get the name of a jail as a string for the given
				.Fa jid
				.Pq an integer .
				.It Dv params, err = jail.allparams()
				Get a list of all supported parameter names
				.Pq as strings .
				See
				.Xr jail 8
				for descriptions of the core jail parameters.
				.It Dv jid, res = jail.getparams(jid\|name, params [, flags ] )
				Get a table of the requested parameters for the given jail.
				.Nm jid\|name
				can either be the jid as an integer or the jid or name as a string.
				.Nm params
				is a list of parameter names.
				.Nm flags
				is an optional integer representing the flag bits to apply for the operation.
				See the list of flags below.
				Only the
				.Dv DYING
				flag is valid to set.
				.It Dv jid, err = jail.setparams(jid\|name, params [, flags ] )
				Set parameters for a given jail.
				This is used to create, update, attach to, or destroy a jail.
				.Nm jid\|name
				can either be the jid as an integer or the jid or name as a string.
				.Nm params
				is a table of parameters to apply to the jail, where each key in the table
				is a parameter name as a string and each value is a string that will be
				converted to the internal value type by
				.Xr jailparam_import 3 .
				.Nm flags
				is an optional integer representing the flag bits to apply for the operation.
				See the list of flags below.
				.El
				.Pp
				The
				.Nm flags
				arguments are an integer bitwise-or combination of one or more of the following
				flags:
				.Bl -tag -width XXXX
				.It Dv jail.CREATE
				Used with
				.Fn setparams
				to create a new jail.
				The jail must not already exist, unless combined with
				.Dv UPDATE .
				.It Dv jail.UPDATE
				Used with
				.Fn setparams
				to modify an existing jail.
				The jail must already exist, unless combined with
				.Dv CREATE .
				.It Dv jail.ATTACH
				Used with
				.Fn setparams
				in combination with
				.Dv CREATE
				or
				.Dv UPDATE
				to attach the current process to a jail.
				.It Dv jail.DYING
				Allow operating on a jail that is in the process of being removed.
				.El
				.Sh RETURN VALUES
				The
				.Fn getid
				and
				.Fn setparams
				functions return a jail identifier integer on success, or
				.Dv nil
				and an error message string if an error occurred.
				.Pp
				The
				.Fn getname
				function returns a jail name string on success, or
				.Dv nil
				and an error message string if an error occurred.
				.Pp
				The
				.Fn allparams
				function returns a list of parameter name strings on success, or
				.Dv nil
				and an error message string if an error occurred.
				.Pp
				The
				.Fn getparams
				function returns a jail identifier integer and a table of jail parameters
				with parameter name strings as keys and strings for values on success, or
				.Dv nil
				and an error message string if an error occurred.
				.Sh EXAMPLES
				Set the hostname of jail
				.Dq foo
				to
				.Dq foo.bar :
				.Bd -literal -offset indent
				local jail = require('jail')

				jid, err = jail.setparams("foo", {["host.hostname"]="foo.bar"},
				jail.UPDATE)
				if not jid then
				error(err)
				end
				.Ed
				.Pp
				Retrieve the hostname of jail
				.Dq foo :
				.Bd -literal -offset indent
				local jail = require('jail')

				jid, res = jail.getparams("foo", {"host.hostname"})
				if not jid then
				error(res)
				end
				print(res["host.hostname"])
				.Ed
				.Sh SEE ALSO
				.Xr jail 2 ,
				.Xr jail 3 ,
				.Xr jail 8
				.Sh HISTORY
				The
				.Nm jail
				Lua module for flua first appeared in
				.Fx 13.0 .
				.Sh AUTHORS
				.An Ryan Moeller ,
				with inspiration from
				.Nx
				gpio(3lua), by
				.An Mark Balmer .