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From: tel@Ahab.UUCP
Newsgroups: comp.unix.wizards,comp.unix.questions
Subject: Re: Another Annoying Microport Inquiry
Message-ID: <39@Ahab.UUCP>
Date: Fri, 2-Oct-87 13:23:06 EDT
Article-I.D.: Ahab.39
Posted: Fri Oct  2 13:23:06 1987
Date-Received: Sun, 4-Oct-87 06:58:46 EDT
References: <1408@dasys1.UUCP> <6475@brl-smoke.ARPA> <7501@steinmetz.steinmetz.UUCP>
Organization: AT&T National Systems Support Center, South Plainfield, NJ
Lines: 70
Keywords: Microport patch ulimit
Xref: utgpu comp.unix.wizards:4322 comp.unix.questions:3918
Summary: Changing your system wide ulimit.

In article <7501@steinmetz.steinmetz.UUCP>, davidsen@steinmetz.steinmetz.UUCP (William E. Davidsen Jr) writes:
> 
> I agree that there should be a simple **well documented** way to change
> this. As for the original problem, can't superuser set the ligit up as
> well as down? I'm not root on this system and can't try.

There are a couple of ways to do this.  

One way affects all terminals and logins:
	
**** CAUTION: keep at least two terminals logged in as root (super user)
     when following these instructions. In the event that step 4 would fail
     it is then possible to move /bin/login2 back to /bin/login ****

To install ulimit fix perform the following steps:

	1) Login in as root

	2) Modify the ulimit.c program, replacing the "****" characters
	   on line 11 with the desired ulimit value.
	   (should be a multiple of 2048)

	3) execute:  mv /bin/login /bin/login2

	4) execute: cc -O ulimit.c -o /bin/login

	5) execute: chown root /bin/login
	   execute: chmod 4555 /bin/login
	   *These two commands set the owner and perrmissions so that
	    the ulimit will be set upon login.

The following is the ulimit.c program:

#include <stdio.h>
main (argc,argv)
char **argv;
{
        char *ptr;
        char *largs[3];
        char logname[64];
        largs[0] = "login";
        largs[1] = (char *)strncpy(logname,argv[1],64);
        largs[2] = NULL;
        ulimit(2,****);
        execv("/bin/login2",largs);
}


------

Another way that would affect only specific tty lines could be
put a line in your /etc/inittab that looks like:

11:1234:respawn:sh -c "ulimit 50000; exec /etc/getty tty11 4800"

or

12:1234:respawn:sh -c "ulimit 50000; exec /usr/lib/uucp/uugetty -r tty12 9600"

or whatever.

Note, these do work on UNIX SysV on AT&T 3b computers and probably on
any other UNIX system.

----------

Also, note that if you are using SYSV 3.1 or higher on a 3b2 computer,
ULIMIT is a tunable parameter in /etc/master.d/kernel.

--Tom Lowe