e676955476
too, so, instead of descending to the i386 directory, we add some magic to the parent Makefile. These man pages refer to drivers that I'm aware that work on amd64. Most likely there are more, but I'll deal with them later. Approved by: brueffer, philip, takawata
141 lines
4.2 KiB
Groff
141 lines
4.2 KiB
Groff
.\" Copyright (c) 2000 Sheldon Hearn
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" $FreeBSD$
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.\"
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.Dd March 17, 2008
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.Dt LINUX 4 i386
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.Os
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.Sh NAME
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.Nm linux
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.Nd Linux ABI support
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.Sh SYNOPSIS
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To compile support for this ABI into the kernel,
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place the following line in your
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kernel configuration file:
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.Bd -ragged -offset indent
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.Cd "options COMPAT_LINUX"
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.Ed
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.Pp
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Alternatively, to load the ABI as a
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module at boot time, place the following line in
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.Xr loader.conf 5 :
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.Bd -literal -offset indent
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linux_load="YES"
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.Ed
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.Sh DESCRIPTION
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The
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.Nm
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module provides limited
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Linux ABI (application binary interface) compatibility
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for userland applications.
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The module provides the following significant facilities:
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.Bl -bullet
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.It
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An image activator
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for correctly branded
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.Xr elf 5
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executable images
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.It
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Special signal handling for activated images
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.It
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Linux to native system call translation
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.El
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.Pp
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It is important to note that the Linux ABI support
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it not provided through an emulator.
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Rather, a true (albeit limited) ABI implementation is provided.
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.Pp
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The following
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.Xr sysctl 8
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tunable variables are available:
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.Bl -tag -width compat.linux.oss_version
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.It compat.linux.osname
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Linux kernel operating system name.
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.It compat.linux.osrelease
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Linux kernel operating system release.
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Changing this to something else is discouraged on non-development systems,
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because it may change the way Linux programs work.
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Recent versions of GNU libc are known to use different syscalls depending
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on the value of this sysctl.
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.It compat.linux.oss_version
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Linux Open Sound System version.
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.El
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.Pp
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The
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.Nm
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module can be linked into the kernel statically with the
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.Dv COMPAT_LINUX
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kernel configuration option
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or loaded as required.
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The following command will load the module
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if it is neither linked into the kernel
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nor already loaded as a module:
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.Bd -literal -offset indent
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if ! kldstat -v | grep -E 'linux(aout|elf)' > /dev/null; then
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kldload linux > /dev/null 2>&1
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fi
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.Ed
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.Pp
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Note that dynamically linked Linux executables
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will require a suitable environment in
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.Pa /compat/linux .
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Specifically, the Linux run-time linker's hints files
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should be correctly initialized.
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For this reason, it is common to execute the following commands
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to prepare the system to correctly run Linux executables:
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.Bd -literal -offset indent
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if [ -x /compat/linux/sbin/ldconfig ]; then
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/compat/linux/sbin/ldconfig -r /compat/linux
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fi
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.Ed
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.Pp
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For information on loading the
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.Nm
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kernel loadable module automatically on system startup,
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see
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.Xr rc.conf 5 .
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This information applies
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regardless of whether the
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.Nm
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module is statically linked into the kernel
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or loaded as a module.
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.Sh FILES
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.Bl -tag -width /compat/linux/proc -compact
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.It Pa /compat/linux
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minimal Linux run-time environment
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.It Pa /compat/linux/proc
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limited Linux process file system
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.It Pa /compat/linux/sys
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limited Linux system file system
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.El
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.Sh SEE ALSO
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.Xr brandelf 1 ,
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.Xr elf 5 ,
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.Xr linprocfs 5 ,
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.Xr linsysfs 5
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.Sh HISTORY
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Linux ABI support first appeared in
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.Fx 2.1 .
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