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-.\" Copyright (c) 2000 Sheldon Hearn
-.\" 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 August 17, 2000
-.Dt LINUX 4 Alpha
-.Os
-.Sh NAME
-.Nm linux
-.Nd Linux ABI support
-.Sh SYNOPSIS
-To link Linux ABI support into the kernel:
-.Cd "options COMPAT_LINUX"
-.Pp
-To load the Linux ABI support kernel module:
-.Dl kldload linux
-.Sh DESCRIPTION
-The
-.Nm
-module provides limited
-Linux ABI (application binary interface) compatibility
-for userland applications.
-The module provides the following significant facilities:
-.Bl -bullet
-.It
-An image activator
-for correctly branded
-.Xr elf 5
-executable images
-.It
-Special signal handling for activated images
-.It
-Linux to native system call translation
-.El
-.Pp
-It is important to note that the Linux ABI support
-it not provided through an emulator.
-Rather, a true (albeit limited) ABI implementation is provided.
-.Pp
-The following
-.Xr sysctl 8
-tunable variables are available:
-.Bl -tag -width compat.linux.oss_version
-.It compat.linux.osname
-Linux kernel operating system name.
-.It compat.linux.osrelease
-Linux kernel operating system release.
-.It compat.linux.oss_version
-Linux Open Sound System version.
-.El
-.Pp
-The
-.Nm
-module can be linked into the kernel statically with the
-.Dv COMPAT_LINUX
-kernel configuration option
-or loaded as required.
-The following command will load the module
-if it is neither linked into the kernel
-nor already loaded as a module:
-.Bd -literal -offset indent
-if ! kldstat -v | grep -E 'linux(aout|elf)' > /dev/null; then
-	kldload linux > /dev/null 2>&1
-fi
-.Ed
-.Pp
-Note that dynamically linked Linux executables
-will require a suitable environment in
-.Pa /compat/linux .
-Specifically, the Linux run-time linker's hints files
-should be correctly initialized.
-For this reason, it is common to execute the following commands
-to prepare the system to correctly run Linux executables:
-.Bd -literal -offset indent
-if [ -x /compat/linux/sbin/ldconfig ]; then
-	/compat/linux/sbin/ldconfig
-fi
-.Ed
-.Pp
-For information on loading the
-.Nm
-kernel loadable module automatically on system startup,
-see
-.Xr rc.conf 5 .
-This information applies
-regardless of whether the
-.Nm
-module is statically linked into the kernel
-or loaded as a module.
-.Sh FILES
-.Bl -tag -width /compat/linux/proc -compact
-.It Pa /compat/linux
-minimal Linux run-time environment
-.It Pa /compat/linux/proc
-limited Linux process file system
-.El
-.Sh SEE ALSO
-.Xr brandelf 1 ,
-.Xr elf 5 ,
-.Xr linprocfs 5
-.Sh HISTORY
-Linux ABI support first appeared in
-.Fx 2.1 .