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From: ggs@ulysses.UUCP
Newsgroups: comp.unix.wizards
Subject: Re: umask under 4.3 BSD
Message-ID: <2625@ulysses.homer.nj.att.com>
Date: Mon, 1-Jun-87 21:02:01 EDT
Article-I.D.: ulysses.2625
Posted: Mon Jun  1 21:02:01 1987
Date-Received: Thu, 4-Jun-87 01:16:18 EDT
References: <7554@brl-adm.ARPA>
Organization: AT&T Bell Laboratories, Murray Hill
Lines: 33
Summary: it's in /sys/sys/init_main.c

In article <7554@brl-adm.ARPA>, eichelbe@nadc.arpa writes:
> I am running 4.3 BSD on a VAX 11/780.  Does anyone know how I could
> change the system-wide "umask" so when I person does something like
> echo "stuff" > x
> 
> x will have the file permission 0600 and not 0644?  I have source code
> for the system.
> 
> 	Thanks.
> 		Jon Eichelberger
> 		eichelbe@NADC.ARPA

Just in case you wanted a straight answer instead of a lot of philosophy:

The system-wide default for the umask is set in /sys/sys/init_main.c,
line 33, from a parameter, CMASK, that is set in /sys/h/param.h.  To
change the global value, either change the value in the header file and
re-build the kernel or use adb to patch the variable "cmask" in the
bootable kernel.  In either case, you have to re-boot to have the
change take effect.  To patch the value to 0066 with adb:

adb -w /vmunix -
cmask?W 0o066

Doing the change here has the added benefit that files created by rsh'ed
commands also get the desired umask; unfortunately, some of the daemons
do not set good defaults.  One could probably also fix the problem by
setting the default in "init".
-- 
Griff Smith	AT&T (Bell Laboratories), Murray Hill
Phone:		1-201-582-7736
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