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.\"
.\" Copyright (c) 2001 Peter Pentchev
.\" 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, 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
.\" 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.
.\"
.\" $FreeBSD$
.\"
.Dd September 29, 2020
.Dt KLDCONFIG 8
.Os
.Sh NAME
.Nm kldconfig
.Nd display or modify the kernel module search path
.Sh SYNOPSIS
.Nm
.Op Fl dfimnUv
.Op Fl S Ar sysctlname
.Op Ar path ...
.Nm
.Fl r
.Sh DESCRIPTION
The
.Nm
utility
displays or modifies the search path used by the kernel when loading modules
using the
.Xr kldload 8
utility or the
.Xr kldload 2
syscall.
.Pp
The following options are available:
.Bl -tag -width indent
.It Fl d
Remove the specified paths from the module search path.
.It Fl f
Do not fail if a path specified for adding is already present in the search
path, or if a path specified for removing is not present in the search path.
This may be useful in startup/shutdown scripts for adding a path to
a file system which is still not mounted, or in shutdown scripts for
unconditionally removing a path that may have been added during startup.
.It Fl i
Add the specified paths to the beginning of the search path, not to the end.
This option can only be used when adding paths.
.It Fl m
Instead of replacing the module search path with the set of paths
specified,
.Dq merge
in the new entries.
.It Fl n
Do not actually change the module search path.
.It Fl r
Display the current search path.
This option cannot be used if any paths are also specified.
.It Fl S Ar sysctlname
Specify the sysctl name to use instead of the default
.Va kern.module_path .
.It Fl U
.Dq Unique-ify
the current search path - if any of the directories is repeated one
or more times, only the first occurrence remains.
This option implies
.Fl m .
.It Fl v
Verbose output: display the new module search path.
If the path has been changed, and the
.Fl v
flag is specified more than once, the old path is displayed as well.
.El
.Sh FILES
.Bl -tag -width indent
.It Pa /boot/kernel , /boot/modules , /modules
The default module search path used by the kernel.
.El
.Sh EXIT STATUS
.Ex -std
.Sh EXAMPLES
Show the module search path
.Bd -literal -offset indent
$ kldconfig -r
/boot/kernel;/boot/modules;/boot/dtb;/boot/dtb/overlays
.Ed
.Pp
Try to delete the
.Pa /boot
directory from the search path.
The command will fail:
.Bd -literal -offset indent
$ kldconfig -d /boot
kldconfig: not in module search path: /boot
$ echo $?
1
.Ed
.Pp
Same as above but forcing the operation.
This time the command will succeed:
.Bd -literal -offset indent
$ kldconfig -d -f /boot
$ echo $?
0
.Ed
.Pp
Add the
.Pa /boot
directory to the beginning of the search path and display extra verbose output:
.Bd -literal -offset indent
$ kldconfig -i -m -vv /boot
/boot/kernel;/boot/modules -> /boot;/boot/kernel;/boot/modules
.Ed
.Pp
Without
.Fl m
the
.Fl i
flag will overwrite the contents of the search path list:
.Bd -literal -offset indent
$ kldconfig -i -vv /boot
/boot;/boot/kernel;/boot/modules;/boot/dtb;/boot/dtb/overlays -> /boot
.Ed
.Pp
Same as above but using
.Fl n
to simulate the operation without actually doing it:
.Bd -literal -offset indent
$ kldconfig -i -n -vv /boot
/boot;/boot/kernel;/boot/modules;/boot/dtb;/boot/dtb/overlays -> /boot
.Ed
.Pp
Add directories to the search path removing duplicates.
Note the need of
.Fl f
to force the operation in case any of the directories is already in the
search path.
The
.Pa /boot/kernel
directory will be added once:
.Bd -literal -offset indent
$ kldconfig -f -U /boot/kernel /boot/kernel /boot/modules /boot/dtb /boot/dtb/overlays
.Ed
.Sh SEE ALSO
.Xr kldload 2 ,
.Xr kldload 8 ,
.Xr kldxref 8 ,
.Xr sysctl 8
.Sh HISTORY
The
.Nm
utility first appeared in
.Fx 4.4 .
.Sh AUTHORS
.An Peter Pentchev Aq Mt roam@FreeBSD.org