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NetBSD 6.1.5 - man page for compat_sco (netbsd section 8)

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COMPAT_SVR4(8)			   BSD System Manager's Manual			   COMPAT_SVR4(8)

NAME
     compat_svr4 -- setup procedure for running SVR4/iBCS2 binaries compat_svr4_32 -- setup pro-
     cedure for running 32-bit SVR4/iBCS2 binaries

DESCRIPTION
     NetBSD supports running SVR4/iBCS2 binaries.  This code has been tested on i386 (with bina-
     ries from SCO OpenServer and XENIX), m68k (with binaries from AMIX) and sparc (with binaries
     from Solaris) systems.  Most programs should work, but not ones that use or depend on:

	   kernel internal data structures
	   the /proc filesystem
	   the ticotsord loopback RPC mechanism (NIS uses this)
	   sound and video interfaces
	   threads (ttsession uses threads)
	   the streams administrative driver

     The SVR4 compatibility feature is active for kernels compiled with the COMPAT_SVR4 option
     enabled.  Since support for ELF executables is included only if the kernel is compiled with
     the EXEC_ELF32 or EXEC_ELF64 options enabled, kernels which include COMPAT_SVR4 should also
     typically include EXEC_ELF32 (for 32-bit ELF support) and/or EXEC_ELF64 (for 64-bit ELF sup-
     port).

     Another compatibility feature is COMPAT_SVR4_32, which allows the execution of 32-bit SVR4
     binaries on a machine with a 64-bit kernel.  This requires EXEC_ELF32 and COMPAT_NETBSD32
     options as well as COMPAT_SVR4.  It is configured the same way as COMPAT_SVR4 but uses the
     /emul/svr4_32 directory instead of /emul/svr4.  But typically, /emul/svr4_32 can be made to
     point to /emul/svr4 if the operating system donating the libraries has support for both
     32-bit and 64-bit binaries.

     Execution of 32-bit SVR4 binaries on a machine with a 32-bit kernel uses COMPAT_SVR4, not
     COMPAT_SVR4_32.

     Most SVR4 programs are dynamically linked.  This means that you will also need the shared
     libraries that the program depends on and the runtime linker.  Also, you will need to create
     a ``shadow root'' directory for SVR4 binaries on your NetBSD system.  This directory is
     named /emul/svr4.	Any file operations done by SVR4 programs run under NetBSD will look in
     this directory first.  So, if a SVR4 program opens, for example, /etc/passwd, NetBSD will
     first try to open /emul/svr4/etc/passwd, and if that does not exist open the 'real'
     /etc/passwd file.	It is recommended that you install SVR4 packages that include configura-
     tion files, etc under /emul/svr4, to avoid naming conflicts with possible NetBSD counter-
     parts.  Shared libraries should also be installed in the shadow tree.

     The simplest way to set up your system for SVR4 binaries is:
     1.   Make the necessary directories:

		(me@netbsd) mkdir -p /emul/svr4/{dev,etc}
		(me@netbsd) mkdir -p /emul/svr4/usr/{bin,lib,ucblib}
		(me@netbsd) mkdir -p /emul/svr4/usr/openwin/{bin,lib}
		(me@netbsd) mkdir -p /emul/svr4/usr/dt/{bin,lib}

     2.   Copy files from an svr4 system:

		(me@svr4) cd /usr/lib
		(me@svr4) tar -cf - . | \
		     rsh netbsd 'cd /emul/svr4/usr/lib && tar -xpf -'

		(me@svr4) cd /usr/ucblib
		(me@svr4) tar -cf - . | \
		     rsh netbsd 'cd /emul/svr4/usr/ucblib && tar -xpf -'

	  If you are running openwindows:

		(me@svr4) cd /usr/openwin/lib
		(me@svr4) tar -cf - . | \
		     rsh netbsd 'cd /emul/svr4/usr/openwin/lib && tar -xpf -'
		(me@svr4) cd /usr/dt/lib
		(me@svr4) tar -cf - . | \
		     rsh netbsd 'cd /emul/svr4/usr/dt/lib && tar -xpf -'
     3.   You will also probably need the timezone files from your Solaris system, otherwise emu-
	  lated binaries will run on UTC time.

		(me@netbsd) mkdir -p /emul/svr4/usr/share/lib/zoneinfo
		(me@netbsd) mkdir -p /emul/svr4/etc/default
		(me@svr4) cd /usr/share/lib/zoneinfo
		(me@solaris) tar -cf -. | \
		     rsh netbsd 'cd /emul/svr4/usr/share/lib/zoneinfo &&
		     tar -xpf -'
		(me@netbsd) echo TZ=US/Pacific > /emul/svr4/etc/default/init
     4.   Set up the configuration files and devices:

		(me@netbsd) cd /usr/share/examples/emul/svr4/etc
		(me@netbsd) cp netconfig nsswitch.conf /emul/svr4/etc
		(me@netbsd) cp SVR4_MAKEDEV /emul/svr4/dev
		(me@netbsd) cd /emul/svr4/dev && sh SVR4_MAKEDEV all

	  As the major number allocated for emulation of SVR4 devices may vary between NetBSD
	  platforms, the SVR4_MAKEDEV script uses the uname(1) command to determine the architec-
	  ture the devices nodes are being created for; this can be overridden by setting the
	  MACHINE environment variable accordingly.

     An alternative method is to mount a whole SVR4 partition in /emul/svr4 and then override
     with other mounts /emul/svr4/etc and /emul/svr4/dev.

BUGS
     Many system calls are still not emulated.	The streams emulation is incomplete (socketpair
     does not work yet).

     Most SVR4 executables can not handle directory offset cookies > 32 bits.  More recent ones,
     compiled for large file support (Solaris 2.6 and up) can.	With older programs, you will see
     the message ``svr4_getdents: dir offset too large for emulated program'' when this happens.
     Currently, this can only happen on NFS mounted filesystems, mounted from servers that return
     offsets with information in the upper 32 bits.  These errors should rarely happen, but can
     be avoided by mounting this filesystem with offset translation enabled.  See the -X option
     to mount_nfs(8).  The -2 option to mount_nfs(8) will also have the desired effect, but is
     less preferable.

BSD					  April 19, 1999				      BSD
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