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LINUX(4) FreeBSD Kernel Interfaces Manual LINUX(4) NAME linux -- Linux ABI support SYNOPSIS To compile support for this ABI into an i386 kernel place the following line in your kernel configuration file: options COMPAT_LINUX for an amd64 kernel use: options COMPAT_LINUX32 Alternatively, to load the ABI as a module at boot time, place the fol- lowing line in loader.conf(5): linux_load="YES" DESCRIPTION The linux module provides limited Linux ABI (application binary inter- face) compatibility, making it possible to run many unmodified Linux ap- plications and libraries without the need for virtualization or emula- tion. Some of the facilities provided are: +o An image activator for correctly branded elf(5) executable images +o Special signal handling for activated images +o Linux to native system call translation +o Linux-specific system calls Note that dynamically linked Linux executables will require a suitable environment in /compat/linux. This includes native Linux shared li- braries, and Linux-specific virtual filesystems. To set it up, install the emulators/linux_base-c7 port or the linux_base-c7 package, and add the following line to the rc.conf(5) file: linux_enable="YES" To avoid mounting Linux-specific filesystems at startup, also add the following line: linux_mounts_enable="NO" SYSCTL VARIABLES The following variables are available as both sysctl(8) variables and loader(8) tunables: compat.linux.debug Enable debugging messages. Set to 0 to silence them. Defaults to 1. compat.linux.default_openfiles Default soft openfiles resource limit for Linux applications. Set to -1 to disable the limit. Defaults to 1024. compat.linux.emul_path Path to the Linux run-time environment. Defaults to /compat/linux. compat.linux.osname Linux kernel operating system name. compat.linux.osrelease Linux kernel operating system release. Changing this to some- thing else is discouraged on non-development systems, because it may change the way Linux programs work. Recent versions of GNU libc are known to use different syscalls depending on the value of this sysctl. compat.linux.oss_version Linux Open Sound System version. compat.linux.preserve_vstatus When set to 1, it prevents Linux applications from resetting the termios(4) VSTATUS setting. From a user perspective, this makes SIGINFO work for Linux executables. Defaults to 0. FILES /compat/linux minimal Linux run-time environment /compat/linux/dev device file system, see devfs(5) /compat/linux/dev/fd file descriptor file system mounted with the linrdlnk option, see fdescfs(5) /compat/linux/dev/shm in-memory file system, see tmpfs(5) /compat/linux/proc Linux process file system, see linprocfs(5) /compat/linux/sys Linux kernel objects file system, see linsysfs(5) SEE ALSO brandelf(1), pty(4), elf(5), fdescfs(5), linprocfs(5), linsysfs(5), tmpfs(5) HISTORY Linux ABI support first appeared in FreeBSD 2.1. BUGS Support for some of the Linux-specific system calls and system call argu- ments is missing. FreeBSD 13.0 July 5, 2020 FreeBSD 13.0
NAME | SYNOPSIS | DESCRIPTION | SYSCTL VARIABLES | FILES | SEE ALSO | HISTORY | BUGS
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