COMPAT_LINUX(8) OpenBSD Man

COMPAT_LINUX(8)         OpenBSD System Manager's Manual        COMPAT_LINUX(8)
NAME
     compat_linux - setup for running Linux binaries under emulation
DESCRIPTION
     OpenBSD supports running Linux binaries.  This only applies to i386 sys-
     tems for now.  Both the a.out and ELF binary formats are supported.  Most
     programs should work, including the ones that use the Linux SVGAlib.  Ad-
     ditionally, OSS audio is emulated, so Linux binaries can access the na-
     tive audio transparently.  Programs that will not work include those that
     use i386-specific calls, such as enabling virtual 8086 mode.
     The Linux compatibility feature is active for kernels compiled with the
     COMPAT_LINUX option and kern.emul.linux
sysctl(8)
enabled.
     A lot of programs are dynamically linked.  This means that the Linux
     shared libraries that the programs depend on and the runtime linker are
     also needed.  Additionally, a "shadow root" directory for Linux binaries
     on the OpenBSD system will have to be created.  This directory is named
     /emul/linux.  Any file operations done by Linux programs run under OpenB-
     SD will look in this directory first.  So, if a Linux program opens, for
     example, /etc/passwd, OpenBSD will first try to open
     /emul/linux/etc/passwd, and if that does not exist open the `real'
     /etc/passwd file.  It is recommended that Linux packages that include
     configuration files, etc., be installed under /emul/linux, to avoid nam-
     ing conflicts with possible OpenBSD counterparts.  Shared libraries
     should also be installed in the shadow tree.
     Generally, it will only be necessary to look for the shared libraries
     that Linux binaries depend on the first few times that Linux programs are
     installed on the OpenBSD system.  After a while, there will be a suffi-
     cient set of Linux shared libraries on the system to be able to run newly
     imported Linux binaries without any extra work.
   Setting up shared libraries
     How to get to know which shared libraries Linux binaries need, and where

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