From mboxrd@z Thu Jan 1 00:00:00 1970 From: reed@reedmedia.net (Jeremy C. Reed) Date: Fri, 20 Apr 2012 11:56:32 -0500 (CDT) Subject: [TUHS] 4.4BSD installed image or login shell? In-Reply-To: <1334906561.3249.2.camel@mary.home.gateway> References: <20120419205405.f0b3627e.jkunz@unixag-kl.fh-kl.de> <20120419215030.c116bf2c.jkunz@unixag-kl.fh-kl.de> <20120419230724.8144b348.jkunz@unixag-kl.fh-kl.de> <1334891195.6852.2.camel@mary.home.gateway> <20120420083427.11d4bfb8.jkunz@unixag-kl.fh-kl.de> <1334906561.3249.2.camel@mary.home.gateway> Message-ID: On Fri, 20 Apr 2012, Nick Downing wrote: > OK, I hadn't been aware of the significance of the 2 in 4.4BSD-Lite2, so > I understand it contains a CSRG version of the startup code, etc that > was originally from AT&T and was left out of 4.4BSD-Lite? Is it > anything to do with Jolitz's work on 386BSD? Does it have anything > else? Searching threw up a few results on multiprocessor locking so > maybe it contains additional features as well as just the missing code? > cheers, Nick It doesn't appear to include the needed code. From looking at huge diff, I don't see any additions identified from Jolitz/Telemuse/386BSD. (For example, Lite already had Jolitz i386 code and Lite2 only had minimal changes to the code.) I quote from Cover.rel2 document for Lite2: ``It will not be possible to compile or run this software without a pre-existing system that is already installed and running. In addition, the distribution does not include sources for a complete system. It includes source code and manual pages for the C library, approximately 90% of the utilities distributed as part of 4.4BSD, and most of the kernel (the same subsystems that were deleted in Net/2 are still missing in 4.4BSD-Lite Release 2 (support for executing files, doing physical I/O, managing the buffer cache, handling process tracing, terminal character I/O, and doing accounting).'' The diff is huge. Lite2 has many changes: ``includes the copy editing work done for the Usenix/O'Reilly manuals as well as numerous bug fixes and enhancements that have been accumulated in the year since the release of 4.4BSD-Lite. Of particular interest are the changes needed to port the system to 64-bit architectures, important security enhancements to TCP/IP, and much improved functionality for the union and log-structured filesystems.'' (See http://mail-index.netbsd.org/current-users/1995/03/23/0008.html or the Cover.rel2 document.) I think is also incorporates many changes already done by BSDI, NetBSD, and FreeBSD. By the way, the TUHS page at http://minnie.tuhs.org/cgi-bin/utree.pl?file=4.4BSD lists some files removed to create Lite. Actually per filenames, only the sysv_shm.c and shm.h and cpio.c files were removed. (cpio replaced with pax.) All were modified. (That TUHS page also has two mistakes: lists /sys/sys/buf.h twice and misspells /sys/ufs/inode.h as indode.h.) The Restricted Files also listed: sys/kern/kern_physio.c, sys/kern/vfs_bio.c, and sys/sys/tty.h and they are still included in Lite. Probably because files were not included in historical AT&T code, because newer USL code did include them, lots rewritten and so if any code was reused it became insignificant and was agreed on. vfs_bio.c was mentioned in a declaration stating is was based on published pseudo-code. Where is the actual list of files missing in Lite (that are in Encumbered)?