Unix 5.4 and ulimit

[Dave McCracken]

scotte at applix.com (Scott Evernden) writes:

>In article <1991Apr21.140740.6766 at gold.sub.org> root at gold.sub.org (Christian Seyb) writes:
>>Hello,
>>
>>I am using Unix 5.4 (4.0.2) and have a problem with ulimit.

>Upping your ulimit is described in the FAQ for this group.  I quote: "
>    1. If your desired limit is > 12288(6MB):
>        Edit /etc/conf/cf.d/mtune to change the following line:
>            ULIMIT          3072    2048    12288
>        to:
>            ULIMIT          3072    2048    xxxxx
> etc.

Unfortunately, this is no longer accurate for Unix 5.4 (SVR4).
The files that need to be changed are still valid
(/etc/conf/cf.d/?(mtune|stune)), but the value that controls
file size limit (nee ULIMIT) has changed.  As of SVR4, the complete
BSD-style resource limit capability has been implemented.  To
change what is commonly considered ULIMIT, you need to change
the entries SFSZLIM (for soft limit) and HFSZLIM (for hard limit).
They are close to the bottom of the mtune file, along with some 
comments (!!) that describe what they are.  These limits are in
bytes, rather than blocks, and a value of 0 is no longer used
to mean unlimited.  Unlimited is now MAXINT.

Note that the ULIMIT entry in /etc/default login should still
work, and the shells still understand the ulimit command.  For
a quick peek at the new features, to a "ulimit -A" to ksh.
Unfortunately, the values are printed in blocks for compatibility,
so be prepared for some confusion.

--
Dave McCracken      dcm at dell.dell.com      (512) 343-3720
Dell Computer       9505 Arboretum Blvd    Austin, TX 78759-7299