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34 To compile support for this ABI into an i386 kernel
35 place the following line in your
36 kernel configuration file:
37 .Bd -ragged -offset indent
38 .Cd "options COMPAT_LINUX"
41 for an amd64 kernel use:
42 .Bd -ragged -offset indent
43 .Cd "options COMPAT_LINUX32"
46 Alternatively, to load the ABI as a
47 module at boot time, place the following line in
49 .Bd -literal -offset indent
55 module provides limited Linux ABI (application binary interface) compatibility,
56 making it possible to run many unmodified Linux applications and libraries
57 without the need for virtualization or emulation.
58 Some of the facilities provided are:
66 Special signal handling for activated images
68 Linux to native system call translation
70 Linux-specific system calls
73 Note that dynamically linked Linux executables
74 will require a suitable environment in
76 This includes native Linux shared libraries, and Linux-specific virtual
78 To set it up, install the
79 .Pa emulators/linux_base-c7
80 port or the linux_base-c7
81 package, and add the following line to the
85 .Dl linux_enable="YES"
87 To avoid mounting Linux-specific filesystems at startup, also add the following
90 .Dl linux_mounts_enable="NO"
92 The following variables are available as both
97 .Bl -tag -width indent
98 .It Va compat.linux.osname
99 Linux kernel operating system name.
100 .It Va compat.linux.osrelease
101 Linux kernel operating system release.
102 Changing this to something else is discouraged on non-development systems,
103 because it may change the way Linux programs work.
104 Recent versions of GNU libc are known to use different syscalls depending
105 on the value of this sysctl.
106 .It Va compat.linux.oss_version
107 Linux Open Sound System version.
109 .Bl -tag -width /compat/linux/dev/shm -compact
111 minimal Linux run-time environment
112 .It Pa /compat/linux/dev/fd
113 file-descriptor file system, see
115 .It Pa /compat/linux/dev/shm
116 in-memory file system, see
118 .It Pa /compat/linux/proc
119 Linux process file system, see
121 .It Pa /compat/linux/sys
122 Linux kernel objects file system, see
134 Linux ABI support first appeared in
137 Support for some of the Linux-specific system calls and system call arguments