src/bin/compress/usermem.sh

   1 #! /bin/sh
   2 #
   3 #       @(#)usermem.sh 1.1 86/09/25 SMI; from UCB 5.4 85/09/17
   4 #
   5 : This shell script snoops around to find the maximum amount of available
   6 : user memory.  These variables need to be set only if there is no
   7 : /usr/adm/messages.  KMEM, UNIX, and CLICKSIZE can be set on the command
   8 : line, if desired, e.g. UNIX=/unix
   9 KMEM=/dev/kmem          # User needs read access to KMEM
  10 UNIX=
  11 # VAX                   CLICKSIZE=512,  UNIX=/vmunix
  12 # PDP-11                CLICKSIZE=64,   UNIX=/unix
  13 # CADLINC 68000         CLICKSIZE=4096, UNIX=/unix
  14 # Perkin-Elmer 3205     CLICKSIZE=4096, UNIX=/edition7
  15 # Perkin-Elmer all others, CLICKSIZE=2048, UNIX=/edition7
  16 CLICKSIZE=512
  17 eval $*
  18
  19 if test -n "$UNIX"
  20 then
  21     : User must have specified it already.
  22 elif test -r /vmunix
  23 then
  24     UNIX=/vmunix
  25     if [ -r /bin/sun2 ] && /bin/sun2
  26     then
  27         CLICKSIZE=2048  # Sun-2
  28     elif [ -r /bin/sun3 ] && /bin/sun3
  29     then
  30         CLICKSIZE=8192  # Sun-3
  31     else
  32         CLICKSIZE=512   # Probably VAX
  33     fi
  34 elif test -r /edition7
  35 then
  36     UNIX=/edition7
  37     CLICKSIZE=2048      # Perkin-Elmer: change to 4096 on a 3205
  38 elif test -r /unix
  39 then
  40     UNIX=/unix          # Could be anything
  41 fi
  42
  43 SIZE=0
  44 # messages: probably the most transportable
  45 if test -r /usr/adm/messages -a -s /usr/adm/messages
  46 then
  47     SIZE=`grep avail /usr/adm/messages | sed -n '$s/.*[         ]//p'`
  48 fi
  49
  50 if test 0$SIZE -le 0            # no SIZE in /usr/adm/messages
  51 then
  52     if test -r $KMEM            # Readable KMEM
  53     then
  54         if test -n "$UNIX"
  55         then
  56             SIZE=`echo maxmem/D | adb $UNIX $KMEM | sed -n '$s/.*[      ]//p'`
  57             if test 0$SIZE -le 0
  58             then
  59                 SIZE=`echo physmem/D | adb $UNIX $KMEM | sed -n '$s/.*[         ]//p'`
  60             fi
  61             SIZE=`expr 0$SIZE '*' $CLICKSIZE`
  62         fi
  63     fi
  64 fi
  65
  66 case $UNIX in
  67     /vmunix)            # Assume 4.2bsd: check for resource limits
  68         MAXSIZE=`csh -c limit | awk 'BEGIN      { MAXSIZE = 1000000 }
  69 /datasize|memoryuse/ && NF == 3 { if ($2 < MAXSIZE) MAXSIZE = $2 }
  70 END     { print MAXSIZE * 1000 }'`
  71         if test $MAXSIZE -lt $SIZE
  72         then
  73             SIZE=$MAXSIZE
  74         fi
  75         ;;
  76 esac
  77
  78 if test 0$SIZE -le 0
  79 then
  80     echo 0;exit 1
  81 else
  82     echo $SIZE
  83 fi