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-.\"
-.\" Copyright (C) 2002 Chad David <davidc@FreeBSD.org>. All rights reserved.
-.\"
-.\" Redistribution and use in source and binary forms, with or without
-.\" modification, are permitted provided that the following conditions
-.\" are met:
-.\" 1. Redistributions of source code must retain the above copyright
-.\"    notice(s), this list of conditions and the following disclaimer as
-.\"    the first lines of this file unmodified other than the possible
-.\"    addition of one or more copyright notices.
-.\" 2. Redistributions in binary form must reproduce the above copyright
-.\"    notice(s), 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 COPYRIGHT HOLDER(S) ``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 COPYRIGHT HOLDER(S) BE LIABLE FOR ANY
-.\" DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
-.\" (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
-.\" SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
-.\" CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
-.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
-.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
-.\" DAMAGE.
-.\"
-.Dd June 20, 2021
-.Dt KENV 2
-.Os
-.Sh NAME
-.Nm kenv
-.Nd kernel environment
-.Sh LIBRARY
-.Lb libc
-.Sh SYNOPSIS
-.In kenv.h
-.Ft int
-.Fn kenv "int action" "const char *name" "char *value" "int len"
-.Sh DESCRIPTION
-The
-.Fn kenv
-system call manipulates kernel environment variables.
-It supports the well known userland actions of getting, setting and unsetting
-environment variables, as well as the ability to dump all of the entries in
-the kernel environment.
-.Pp
-The
-.Fa action
-argument can be one of the following:
-.Bl -tag -width ".Dv KENV_DUMP_LOADER"
-.It Dv KENV_GET
-Get the
-.Fa value
-of the variable with the given
-.Fa name .
-The size of the
-.Fa value
-buffer is given by
-.Fa len ,
-which should be at least
-.Dv KENV_MVALLEN
-+ 1 bytes to avoid truncation and to ensure NUL termination.
-.It Dv KENV_SET
-Set or add a variable.
-The
-.Fa name
-and
-.Fa value
-are limited to
-.Dv KENV_MNAMELEN
-and
-.Dv KENV_MVALLEN
-characters, respectively
-.Pq not including the NUL terminator.
-The
-.Fa len
-argument indicates the length of the
-.Fa value
-and must include the NUL terminator.
-This option is only available to the superuser.
-.It Dv KENV_UNSET
-Unset the variable with the given
-.Fa name .
-The
-.Fa value
-and
-.Fa len
-arguments are ignored.
-This option is only available to the superuser.
-.It Dv KENV_DUMP
-Dump as much of the dynamic kernel environment as will fit in
-.Fa value ,
-whose size is given in
-.Fa len .
-If
-.Fa value
-is
-.Dv NULL ,
-.Fn kenv
-will return the number of bytes required to copy out the entire environment.
-The
-.Fa name
-is ignored.
-.It Dv KENV_DUMP_LOADER
-Dump the static environment provided by
-.Xr loader 8 ,
-with semantics identical to
-.Dv KENV_DUMP .
-Duplicate and malformed variables originally present in this environment are
-discarded by the kernel and will not appear in the output.
-.It Dv KENV_DUMP_STATIC
-Dump the static environment defined by the kernel
-.Xr config 5 .
-The semantics are identical to
-.Dv KENV_DUMP_LOADER .
-.El
-.Sh RETURN VALUES
-The
-.Fn kenv
-system call returns 0 if successful in the case of
-.Dv KENV_SET
-and
-.Dv KENV_UNSET ,
-and the number of bytes copied into
-.Fa value
-in the case of
-.Dv KENV_DUMP
-and
-.Dv KENV_GET .
-If an error occurs, a value of \-1 is returned and
-the global variable
-.Va errno
-is set to indicate the error.
-.Sh ERRORS
-The
-.Fn kenv
-system call
-will fail if:
-.Bl -tag -width Er
-.It Bq Er EINVAL
-The
-.Fa action
-argument
-is not a valid option, or the length of the
-.Fa value
-is less than 1 for a
-.Dv KENV_SET .
-.It Bq Er ENOENT
-No value could be found for
-.Fa name
-for a
-.Dv KENV_GET
-or
-.Dv KENV_UNSET .
-.It Bq Er ENOENT
-The requested environment is not available for a
-.Dv KENV_DUMP_LOADER
-or
-.Dv KENV_DUMP_STATIC .
-The kernel is configured to destroy these environments by default.
-.It Bq Er EPERM
-A user other than the superuser attempted to set or unset a kernel
-environment variable.
-.It Bq Er EFAULT
-A bad address was encountered while attempting to copy in user arguments
-or copy out value(s).
-.It Bq Er ENAMETOOLONG
-The
-.Fa name
-or the
-.Fa value
-is longer than
-.Dv KENV_MNAMELEN
-or
-.Dv KENV_MVALLEN
-characters, respectively, or
-.Fa len
-did not include the NUL terminator for a
-.Dv KENV_SET .
-.El
-.Sh SEE ALSO
-.Xr kenv 1
-.Sh AUTHORS
-.An -nosplit
-This manual page was written by
-.An Chad David Aq Mt davidc@FreeBSD.org .
-.Pp
-The
-.Fn kenv
-system call was written by
-.An Maxime Henrion Aq Mt mux@FreeBSD.org .