diff --git a/share/man/man4/linux.4 b/share/man/man4/linux.4 index 212dd2526f3f..b404c9e1c04d 100644 --- a/share/man/man4/linux.4 +++ b/share/man/man4/linux.4 @@ -1,196 +1,198 @@ .\" 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. .\" .Dd May 19, 2024 .Dt LINUX 4 .Os .Sh NAME .Nm linux .Nd Linux ABI support .Sh SYNOPSIS To enable the Linux ABI at boot time, place the following line in .Xr rc.conf 5 : .Bd -literal -offset indent linux_enable="YES" .Ed .Sh DESCRIPTION The .Nm kernel module provides limited Linux ABI (application binary interface) compatibility, making it possible to run many unmodified Linux applications without the need for virtualization or emulation. Some of the facilities provided are: .Bl -bullet .It Linux to native system call translation .It Linux-specific system calls .It Special signal handling for Linux processes .It Path translation mechanism .It Linux-specific virtual file systems .El .Pp The path translation mechanism makes Linux processes look up file paths under .Va emul_path (defaulting to .Pa /compat/linux ) before .Pa / . For example, when Linux process attempts to open .Pa /etc/passwd , -it will really access +it will first access .Pa /compat/linux/etc/passwd , -unless the latter does not exist. +falling back to +.Pa /etc/passwd +if the former does not exist. This is used to make sure Linux processes load Linux shared libraries instead of their similarly-named FreeBSD counterparts, and also to provide alternative versions of certain other files and virtual file systems. .Pp To install Linux shared libraries and system files into .Pa /compat/linux , either use the .Pa emulators/linux_base-c7 port or package, or .Xr debootstrap 8 installed from .Pa sysutils/debootstrap . .Pp To avoid mounting Linux-specific filesystems at startup, add the following line to the .Xr rc.conf 5 file: .Pp .Dl linux_mounts_enable="NO" .Sh SYSCTL VARIABLES The following variables are available as both .Xr sysctl 8 variables and .Xr loader 8 tunables: .Bl -tag -width indent .It Va compat.linux.debug Enable debugging messages. Set to 0 to silence them. Defaults to 3. A setting of 1 prints debug messages, tells about unimplemented stuff (only once). Set to 2 is like 1, but also prints messages about implemented but not tested stuff (only once). Setting it to 3 or higher is like 2, but no rate limiting of messages. .It Va compat.linux.default_openfiles Default soft openfiles resource limit for Linux applications. Set to -1 to disable the limit. Defaults to 1024. .It Va compat.linux.emul_path Path to the Linux run-time environment. Defaults to .Pa /compat/linux . .It Va compat.linux.osname Linux kernel operating system name. Defaults to "Linux". .It Va compat.linux.osrelease Linux kernel operating system release. Changing this to something else is discouraged on non-development systems, because it may change the way Linux programs work. Some versions of GNU libc are known to use different syscalls depending on the value of this sysctl. .It Va compat.linux.oss_version Linux Open Sound System version. Defaults to 198144. .It Va compat.linux.preserve_vstatus When set to 1, it prevents Linux applications from resetting the .Xr termios 4 VSTATUS setting. From a user perspective, this makes .Va SIGINFO work for Linux executables. Defaults to 1. .It Va compat.linux.setid_allowed Enable handling of set-user-ID and set-group-ID mode bits for the new process image file when image is to be executed under Linux ABI. When set to 0, new Linux images always use credentials of the program that issued the .Xr execve 2 call, regardless of the image file mode. This might be reasonable or even required, because .Fx does not emulate the Linux environment completely, and missed features may result in security vulnerabilities. Defaults to 1. .It Va compat.linux32.emulate_i386 In the x86_64 (amd64) world enable the real i386 Linuxulator behavior. For example, when set to 0, Linux uname -m will return "x86_64" even if uname itself is a i386 Linux executable. When set to 1, Linux i386 uname -m will return "i686". Defaults to 0. .El .Sh FILES .Bl -tag -width /compat/linux/dev/shm -compact .It Pa /compat/linux Linux run-time environment .It Pa /compat/linux/dev device file system, see .Xr devfs 4 .It Pa /compat/linux/dev/fd file descriptor file system mounted with the .Cm linrdlnk option, see .Xr fdescfs 4 .It Pa /compat/linux/dev/mqueue symbolic link to a mqueuefs mount, see .Xr mqueuefs 4 .It Pa /compat/linux/dev/shm in-memory file system, see .Xr tmpfs 4 .It Pa /compat/linux/proc Linux process file system, see .Xr linprocfs 4 .It Pa /compat/linux/sys Linux kernel objects file system, see .Xr linsysfs 4 .El .Sh SEE ALSO .Xr brandelf 1 , .Xr fdescfs 4 , .Xr linprocfs 4 , .Xr linsysfs 4 , .Xr mqueuefs 4 , .Xr pty 4 , .Xr tmpfs 4 , .Xr elf 5 .Sh HISTORY Linux ABI support first appeared for i386 in .Fx 2.1 . Support for amd64 binaries first appeared in .Fx 10.3 . Support for arm64 binaries first appeared in .Fx 12.0 . .Sh BUGS Support for some of the Linux-specific system calls and system call arguments is missing.