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LINUX(4)	    DragonFly/i386 Kernel Interfaces Manual	      LINUX(4)


linux -- Linux ABI support


To link Linux ABI support into the kernel: options COMPAT_LINUX To load the Linux ABI support kernel module: kldload linux


The linux module provides limited Linux ABI (Application Binary Inter- face) compatibility for userland applications. The module provides the following significant facilities: * An image activator for correctly branded elf(5) executable images * Special signal handling for activated images * Linux to native system call translation It is important to note that the Linux ABI support is not provided through an emulator, instead, a true (albeit limited) ABI implementation is provided. The following sysctl(8) tunable variables are available: compat.linux.osname Linux kernel operating system name. compat.linux.osrelease Linux kernel operating system release. compat.linux.oss_version Linux Open Sound System version. The linux module can be linked into the kernel statically with the COMPAT_LINUX kernel configuration option or loaded as required. The fol- lowing command will load the module if it is neither linked into the ker- nel nor already loaded as a module: if ! kldstat -v | grep -E 'linux(aout|elf)' > /dev/null; then kldload linux > /dev/null 2>&1 fi Note that dynamically linked Linux executables will require a suitable environment in /compat/linux. Specifically, the Linux run-time linker's hints files should be correctly initialized. For this reason, it is com- mon to execute the following commands to prepare the system to correctly run Linux executables: if [ -x /compat/linux/sbin/ldconfig ]; then /compat/linux/sbin/ldconfig fi For information on loading the linux kernel loadable module automatically on system startup, see rc.conf(5). This information applies regardless of whether the linux module is statically linked into the kernel or loaded as a module.


/compat/linux minimal Linux run-time environment /compat/linux/proc limited Linux process file system


brandelf(1), elf(5), linprocfs(5)


Linux ABI support first appeared in FreeBSD 2.1. DragonFly 4.1 September 17, 2003 DragonFly 4.1

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