[unix-history] / usr / src / usr.bin / compress / usermem.sh

#!/bin/sh -
#
# Copyright (c) 1985 The Regents of the University of California.
# All rights reserved.
#
# This code is derived from software contributed to Berkeley by
# James A. Woods, derived from original work by Spencer Thomas
# and Joseph Orost.
#
# Redistribution and use in source and binary forms are permitted
# provided that the above copyright notice and this paragraph are
# duplicated in all such forms and that any documentation,
# advertising materials, and other materials related to such
# distribution and use acknowledge that the software was developed
# by the University of California, Berkeley.  The name of the
# University may not be used to endorse or promote products derived
# from this software without specific prior written permission.
# THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
# IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
# WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
#
#       @(#)usermem.sh  5.5 (Berkeley) %G%
#
: This shell script snoops around to find the maximum amount of available
: user memory.  These variables need to be set only if there is no
: /usr/adm/messages.  KMEM, UNIX, and CLICKSIZE can be set on the command
: line, if desired, e.g. UNIX=/unix
KMEM=/dev/kmem          # User needs read access to KMEM
UNIX=
# VAX                   CLICKSIZE=512,  UNIX=/vmunix
# PDP-11                CLICKSIZE=64,   UNIX=/unix
# CADLINC 68000         CLICKSIZE=4096, UNIX=/unix
# Perkin-Elmer 3205     CLICKSIZE=4096, UNIX=/edition7
# Perkin-Elmer all others, CLICKSIZE=2048, UNIX=/edition7
CLICKSIZE=512
eval $*

if test -n "$UNIX"
then
   : User must have specified it already.
elif test -r /vmunix
then
   UNIX=/vmunix
   CLICKSIZE=512       # Probably VAX
elif test -r /edition7
then
   UNIX=/edition7
   CLICKSIZE=2048      # Perkin-Elmer: change to 4096 on a 3205
elif test -r /unix
then
   UNIX=/unix          # Could be anything
fi

SIZE=0
# messages: probably the most transportable
if test -r /usr/adm/messages -a -s /usr/adm/messages
then
   SIZE=`grep avail /usr/adm/messages | sed -n '$s/.*[         ]//p'`
fi

if test 0$SIZE -le 0            # no SIZE in /usr/adm/messages
then
   if test -r $KMEM            # Readable KMEM
   then
       if test -n "$UNIX"
       then
           SIZE=`echo maxmem/D | adb $UNIX $KMEM | sed -n '$s/.*[      ]//p'`
           if test 0$SIZE -le 0
           then
               SIZE=`echo physmem/D | adb $UNIX $KMEM | sed -n '$s/.*[         ]//p'`
           fi
           SIZE=`expr 0$SIZE '*' $CLICKSIZE`
       fi
   fi
fi

case $UNIX in
   /vmunix)            # Assume 4.2bsd: check for resource limits
       MAXSIZE=`csh -c limit | awk 'BEGIN      { MAXSIZE = 1000000 }
/datasize|memoryuse/ && NF == 3 { if ($2 < MAXSIZE) MAXSIZE = $2 }
END     { print MAXSIZE * 1000 }'`
       if test $MAXSIZE -lt $SIZE
       then
           SIZE=$MAXSIZE
       fi
       ;;
esac

if test 0$SIZE -le 0
then
   echo 0;exit 1
else
   echo $SIZE
fi