TUHS

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13 participants
6482 discussions

by Sergio Pedraja

LinkedIn ------------ Me gustaría añadirte a mi red profesional en LinkedIn. -Sergio Sergio Pedraja IT Security Administrator / Information Security Manager en Savings Bank Santander y alrededores, España Confirma que conoces a Sergio Pedraja: https://www.linkedin.com/e/-9arw1o-gyzisxbk-15/isd/6035309375/9Ym-js9F/?hs=… -- Estás recibiendo invitaciones a conectar. Haz clic para darte de baja: http://www.linkedin.com/e/-9arw1o-gyzisxbk-15/_SZkCeK7HqzqROuy9YxIdtKYnud5R… (c) 2012 LinkedIn Corporation. 2029 Stierlin Ct, Mountain View, CA 94043, EE.UU.

13 years, 2 months

why the leading under score added to function names?

by arnold＠skeeve.com

Hi All. Recently at work I helped someone figure out that when working with ld, the name of a function "foo" gets turned into "_foo" by the compiler. (It took this old-timer 15 minutes to solve a problem he had been working on for two days!) I'm pretty sure this dates back to PDP-11 days. I'm wondering "why?". Why did the C compiler prepend an underscore to function names? Thanks, Arnold

13 years, 2 months

Yet Another Kernel Description Document

by Warren Toomey

All, I've just received from Poul-Henning Kamp a document entitled "UNIX Program Description", dated January 1976 and written by the UNIX Support Group. It contains detailed descriptions of the functions inside a Unix kernel. Given the date and the USG origin, I'm guessing that the system described is PWB/1.0. Can anybody confirm this at all? The URL is http://minnie.tuhs.org/Archive/PDP-11/Distributions/usdl/unix_program_descr… but I'll move it if it turns out not to be about PWB. I love how new documents and artifacts keep appearing! Thanks phk. Cheers, Warren

13 years, 2 months

Understanding the /bin, /sbin, /usr/bin, /usr/sbin Split

by Hendrik Jan Thomassen

If I recall well the /sbin directory first appeared in HP/UX, and the name stood for 'Static binaries'. Its reason for existence was that with the introduction of shared libraries the file with the C-library had become a single point of failure. Therefore this sbin was introduced to hold Statically linked executables for the most important commands needed to fix a broken system (sh, ls, mv, cp, find, tar, fsck etcetera). With this directory earlier than /bin in his PATH the administrator could at least restore a working libc.so file. And, while we are at it, the name 'executable' was not commonly used: they were called 'binaries' (except in IBM mainframe terminology were they were called 'load modules'). Only much later the habit of /sbin = System binaries emerged. An important reason to split /bin vs. /usr/bin and /lib vs. /usr/lib etc. was that the root file system had to be kept small. The fsck program, while at work, builds tables. If possible, they stay in memory, but if memory runs out fsck writes them to disk. However, you don't want them to be written to an untrusted/unchecked file system, and certainly not to the file system currently under repair. Since the root file system has to be checked before the others, it had to be small enough so ensure that fsck could run memory-based only. Therefore: the /bin, /lib and other root-fs based directories held the minimal stuff needed for booting and for repairs/restores, while all the rest had to go into the "overflow" directories /usr/bin, /usr/lib etc (and, obviously, /usr was a separately mounted partition). Remember: those were the days that every reboot included a full fsck on all your partitions. -- Hendrik-Jan Thomassen <hjt(a)ATComputing.nl> AT Computing 6546 BE Nijmegen NL Fax +31 24 352 72 92 info(a)atcomputing.nl www.atcomputing.nl 'If you think education is expensive, then try ignorance.'

13 years, 3 months

Re: [TUHS] Understanding the /bin, /sbin, /usr/bin, /usr/sbin Split

by Pepe

"Jose R. Valverde" <jrvalverde(a)cnb.csic.es> said: > Beyond that, the original articles and comments complained also about > directory naming (/bin /etc /lib) as "unintuitive". I fail to > understand in > what way is it easier for someone new to a computer to learn a "/bin > /etc /var /lib" alien terminology and what it means, than to learn > "System Config Libraries > etc..." or "Windows Windows32 Windows64 Temp Users and Settings, > etc..." In SCO Xenix/UNIX, the home directory is usually mounted on /u. I was amused the first time I saw it.

13 years, 3 months

Re: [TUHS] Understanding the /bin, /sbin, /usr/bin, /usr/sbin Split

by Norman Wilson

Lyndon Nerenberg: A well designed system without library bloat can pump out some pretty skinny static binaries. ======= V6, for example. Or even V7 if carefully pruned. Once upon a time, I made an RK05 disk (5MB) with a stripped-down post-V7 for an 11/45. It had just enough programs to allow basic file manipulation and text-processing. We used this compact system to allow our secretaries (in a small university department in the early 1980s) to continue typing up papers and letters on the day the machine-room air conditioning was being replaced. With the doors standing open and a big fan, we were willing to leave the 11/45 running, but not the VAX-11/780. Due to contractor screwups (when the chilled water was turned on, it rained up and down the hall--many poorly-soldered joints in the copper pipes), we actually needed this for a couple of days, so for safety I shut the system down every evening, removed the RK05 cartridge, and took it downstairs to the 11/34 that had a tape drive, where I booted RT11 and took an image backup with ROLLOUT. Norman Wilson Toronto ON

13 years, 3 months

Re: [TUHS] Understanding the /bin, /sbin, /usr/bin, /usr/sbin Split

by arnold＠skeeve.com

> http://www.osnews.com/story/25556/Understanding_the_bin_sbin_usr_bin_usr_sb… Cute, but most of the history is wrong. The distinction between /bin and /usr/bin is true - / held the things need to boot the system. Other things were on /usr. The Berkeley guys did NOT invent shared libraries. Shared libraries as we know them came originally from Sun, on SunOS 4.x for sure, possibly on SunOS 3.x. (Larry?) Many commercial vendors adopted the design (Ultrix, I think, and maybe others) and finally around 4.4 they found their way into "pure" BSD. /home and /opt came into the picture circa 1989 with SVR4 when Berkeley, AT&T and Sun (and maybe a few others?) got together to standardize the layout and make diskless booting possbile and reasonable with NFS sharing of home directories. /sbin & /usr/sbin came into the picture at this point also, to hold executables that until then had lived in /etc. The idea was that /etc should only have per-machine configuration files. The general point of the article and of some of the postings, that the proliferation doesn't make a lot of sense today, is well taken. The Bell Labs guys themselves recognized this when they did Plan 9. The problem is even worse on 64 bit Linux systems, which can handle two different architectures. /lib and /lib64 confuse a lot of the older 'configure' programs. Personally, I hate reading articles by "experts" where 85% of the facts are wrong. I lived through all of it, and I know better... :-) Arnold

13 years, 3 months

xv6

by A. P. Garcia

saw this on osnews under 'related articles'; it's a rewrite of sixth edition for x86: http://pdos.csail.mit.edu/6.828/2011/xv6.html

13 years, 3 months

History of man pages

by Greg 'groggy' Lehey

I've received a link http://manpages.bsd.lv/history.html claiming to be about man pages; in fact, it's a lot more than that, including the prehistory of troff. Interesting stuff. Greg -- Sent from my desktop computer Finger grog(a)FreeBSD.org for PGP public key. See complete headers for address and phone numbers. This message is digitally signed. If your Microsoft MUA reports problems, please read http://tinyurl.com/broken-mua

13 years, 3 months

awkcc source code available

by Aharon Robbins

Hi. I announced this in comp.lang.awk in December and tried to BCC the TUHS list but it didn't seem to happen. Here's the announcement I posted. Arnold ----------------------------------------------- From: arnold(a)skeeve.com (Aharon Robbins) Newsgroups: comp.lang.awk Subject: AWKCC source now available Date: Fri, 16 Dec 2011 12:27:39 +0000 (UTC) Message-ID: <jcfdfr$qt9$1(a)dont-email.me> [ BCC to TUHS list, Brian Kernighan & Chris Ramming ] awk 'BEGIN { print "Sherman, set the wayback machine for 1988" }' Hello All. This note is to announce that through the valiant efforts of Brian Kernighan, Alcatel-Lucent has been persuaded to make the source for awkcc available. It can be found at: https://open-innovation.alcatel-lucent.com/projects/awkcc You have to register (no cost) before being able to download, but it's easy. The license terms are at the site. It's a straightforward "for personal use" kind of license. For those who don't know, awkcc is an adaptation of Unix awk to translate nawk programs into C. It was originally implemented by Chris Ramming (then at Bell Labs, although no longer) circa 1988, and the source dist includes some doc that Chris wrote. Given how fast machines are these days, this program is mostly of historical interest. But it's nice to have this bit of Unix / awk history generally available. And, if you really need to turn an awk program into C, this may provide a starting point. Enjoy! -- Aharon (Arnold) Robbins arnold AT skeeve DOT com P.O. Box 354 Home Phone: +972 8 979-0381 Nof Ayalon Cell Phone: +972 50 729-7545 D.N. Shimshon 99785 ISRAEL

13 years, 3 months

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