Setting up shared libraries

1. You have access to a FreeBSD system. In this case you can temporarily install the binary there, see what shared libraries it needs, and copy them to your NetBSD system. Example: you have just ftp-ed the FreeBSD binary of SimCity. Put it on the FreeBSD system you have access to, and check which shared libraries it needs by running ‘ldd sim’:

   me@freebsd% ldd /usr/local/lib/SimCity/res/sim 
   /usr/local/lib/SimCity/res/sim: 
   	-lXext.6 => /usr/X11R6/lib/libXext.so.6.0 (0x100c1000) 
   	-lX11.6 => /usr/X11R6/lib/libX11.so.6.0 (0x100c9000) 
   	-lc.2 => /usr/lib/libc.so.2.1 (0x10144000) 
   	-lm.2 => /usr/lib/libm.so.2.0 (0x101a7000) 
   	-lgcc.261 => /usr/lib/libgcc.so.261.0 (0x101bf000)

   You would need go get all the files from the last column, and put them under /emul/freebsd. This means you eventually have these files on your NetBSD system:

   • /emul/freebsd/usr/X11R6/lib/libXext.so.6.0
   • /emul/freebsd/usr/X11R6/lib/libX11.so.6.0
   • /emul/freebsd/usr/lib/libc.so.2.1
   • /emul/freebsd/usr/lib/libm.so.2.0
   • /emul/freebsd/usr/lib/libgcc.so.261.0

   Note that if you already have a FreeBSD shared library with a matching major revision number to the first column of the ldd output, you won't need to copy the file named in the last column to your system, the one you already have should work. It is advisable to copy the shared library anyway if it is a newer version, though. You can remove the old one. So, if you have these libraries on your system:

   • /emul/freebsd/usr/lib/libc.so.2.0

   and you find that the ldd output for a new binary you want to install is:

   -lc.2 => /usr/lib/libc.so.2.1 (0x10144000)

   You won't need to worry about copying /usr/lib/libc.so.2.1 too, because the program should work fine with the slightly older version. You can decide to replace the libc.so anyway, and that should leave you with:

   • /emul/freebsd/usr/lib/libc.so.2.1

   Finally, you must make sure that you have the FreeBSD runtime linker and its config files on your system. You should copy these files from the FreeBSD system to their appropriate place on your NetBSD system (in the /emul/freebsd tree):

   • usr/libexec/ld.so
   • var/run/ld.so.hints
2. You don't have access to a FreeBSD system. In that case, you should get the extra files you need from various ftp sites. Information on where to look for the various files is appended below. For now, let's assume you know where to get the files.

   Retrieve the following files (from _one_ ftp site to avoid any version mismatches), and install them under /emul/freebsd (i.e. foo/bar is installed as /emul/freebsd/foo/bar):

   • sbin/ldconfig
   • usr/bin/ldd
   • usr/lib/libc.so.x.y.z
   • usr/libexec/ld.so

   ldconfig and ldd don't necessarily need to be under /emul/freebsd, you can install them elsewhere in the system too. Just make sure they don't conflict with their NetBSD counterparts. A good idea would be to install them in /usr/local/bin as ldconfig-freebsd and ldd-freebsd.

   Run the FreeBSD ldconfig program with directory arguments in which the FreeBSD runtime linker should look for shared libs. /usr/lib are standard, you could run like the following:

   me@netbsd% mkdir -p /emul/freebsd/var/run 
   me@netbsd% touch /emul/freebsd/var/run/ld.so.hints 
   me@netbsd% ldconfig-freebsd /usr/X11R6/lib /usr/local/lib

   Note that argument directories of ldconfig are mapped to /emul/freebsd/XXXX by NetBSD's compat code, and should exist as such on your system. Make sure /emul/freebsd/var/run/ld.so.hints is existing when you run FreeBSD's ldconfig, if not, you may lose NetBSD's /var/run/ld.so.hints. FreeBSD ldconfig should be statically linked, so it doesn't need any shared libraries by itself. It will create the file /emul/freebsd/var/run/ld.so.hints. You should rerun the FreeBSD version of the ldconfig program each time you add a new shared library.

   You should now be set up for FreeBSD binaries which only need a shared libc. You can test this by running the FreeBSD ldd on itself. Suppose that you have it installed as ldd-freebsd, it should produce something like:

   me@netbsd% ldd-freebsd `which ldd-freebsd` 
   /usr/local/bin/ldd-freebsd: 
   	-lc.2 => /usr/lib/libc.so.2.1 (0x1001a000)

   This being done, you are ready to install new FreeBSD binaries. Whenever you install a new FreeBSD program, you should check if it needs shared libraries, and if so, whether you have them installed in the /emul/freebsd tree. To do this, you run the FreeBSD version ldd on the new program, and watch its output. ldd (see also the manual page for ldd(1)) will print a list of shared libraries that the program depends on, in the form -l<majorname> => <fullname>.

   If it prints “not found” instead of <fullname> it means that you need an extra library. Which library this is, is shown in <majorname>, which will be of the form XXXX.<N> You will need to find a libXXXX.so.<N>.<mm> on a FreeBSD ftp site, and install it on your system. The XXXX (name) and <N> (major revision number) should match; the minor number(s) <mm> are less important, though it is advised to take the most recent version.

3. In some cases, FreeBSD binary needs access to certain device file. For example, FreeBSD X server software needs FreeBSD /dev/ttyv0 for ioctls. In this case, create a symbolic link from /emul/freebsd/dev/ttyv0 to a wscons(4) device file like /dev/ttyE0. You will need to have at least options WSDISPLAY_COMPAT_SYSCONS and probably also options WSDISPLAY_COMPAT_USL in your kernel (see options(4) and wscons(4)).

Finding the necessary files

The FreeBSD distribution is available on a lot of ftp sites. Sometimes the files are unpacked, and you can get the individual files you need, but mostly they are stored in distribution sets, usually consisting of subdirectories with gzipped tar files in them. The primary ftp sites for the distributions are:

• ftp.freebsd.org:/pub/FreeBSD

Mirror sites are described on:

• ftp.freebsd.org:/pub/FreeBSD/MIRROR.SITES

This distribution consists of a number of tar-ed and gzipped files, Normally, they're controlled by an install program, but you can retrieve files “by hand” too. The way to look something up is to retrieve all the files in the distribution, and ``tar ztvf'' through them for the file you need. Here is an example of a list of files that you might need.

Needed                 Files 
 
ld.so                  2.0-RELEASE/bindist/bindist.?? 
ldconfig               2.0-RELEASE/bindist/bindist.?? 
ldd                    2.0-RELEASE/bindist/bindist.?? 
libc.so.2              2.0-RELEASE/bindist/bindist.?? 
libX11.so.6.0          2.0-RELEASE/XFree86-3.1/XFree86-3.1-bin.tar.gz 
libX11.so.6.0          XFree86-3.1.1/X311bin.tgz 
libXt.so.6.0           2.0-RELEASE/XFree86-3.1/XFree86-3.1-bin.tar.gz 
libXt.so.6.0           XFree86-3.1.1/X311bin.tgz

The files called “bindist.??” are tar-ed, gzipped and split, so you can extract contents by “cat bindist.?? | tar zpxf -”.

Extract the files from these gzipped tarfiles in your /emul/freebsd directory (possibly omitting or afterwards removing files you don't need), and you are done.