examples/stackovf.sh

   1 #!/bin/sh
   2
   3 # Script to verify that stack overflow is diagnosed properly when
   4 # there is infinite macro call nesting.
   5 # (causes coredump in m4-1.0.3)
   6
   7 # On some systems the ulimit command is available in ksh or bash but not sh
   8 (exec 2>/dev/null; ulimit -HSs 300) || {
   9     for altshell in bash bsh ksh ; do
  10         if (exec >/dev/null 2>&1; $altshell -c 'ulimit -HSs 300') &&
  11                                                                 test -z "$1"
  12         then
  13                 echo "Using $altshell because it supports ulimit"
  14                 exec $altshell $0 running-with-$altshell
  15                 exit 9
  16         fi
  17     done
  18 }
  19
  20 PATH=.:..:$PATH; export PATH;
  21 M4=m4
  22 type $M4
  23
  24 tmpfile=`tempfile 2> /dev/null` || tmpfile=/tmp/t.$$
  25 trap 'rm -f $tmpfile; exit 1' 1 2 3 15
  26
  27 rm -f core
  28 perl -e '
  29 # Generate nested define sequence
  30 $max=1000000;
  31 for ($i=0; $i<$max; $i++) {
  32         print "define(X$i,\n";
  33 }
  34 for ($i=$max-1; $i>=0; $i--) {
  35         print "body with substance no. $i)dnl\n"
  36 }
  37 ' | \
  38 (
  39 # Limit the stack size if the shell we are running permits it
  40 if (exec 2>/dev/null; ulimit -HSs 50)
  41 then
  42         (exec >/dev/null 2>&1; ulimit -v) && ulimitdashv=ok
  43         ulimit -HSs 50
  44         #ulimit -HSd 8000
  45         #test -n "$ulimitdashv" && ulimit -HSv 8000
  46         echo "Stack limit is `ulimit -s`K";
  47         echo "Heap limit  is `ulimit -d`K";
  48         test -n "$ulimitdashv" &&
  49                 echo "VMem limit  is `ulimit -v`K";
  50 else
  51         echo "Can't reset stack limit - this may take a while..."
  52 fi
  53 $M4 -L999999999 > $tmpfile 2>&1
  54 )
  55 result=$?
  56
  57 exitcode=1
  58 if test $result -eq 0 ; then
  59     echo "TEST DID NOT WORK - m4 did not abort.  Output:"
  60 else
  61     # See if stack overflow was diagnosed
  62     case "`cat $tmpfile`" in
  63     *overflow*)
  64         echo "Test succeeded.";
  65         exitcode=0
  66         ;;
  67     *ut*of*emory*)
  68         echo "*** Test is INCONCLUSIVE (ran out of heap before stack overflow)";
  69         ;;
  70     *)  echo "*** Test FAILED.  $M4 aborted unexpectedly.  Output:";
  71         ;;
  72     esac
  73 fi
  74
  75 if test -f core ; then
  76     ls -l core
  77     exitcode=1
  78 fi
  79
  80 #(test $exitcode -ne 0) &&
  81     { echo "Output from $M4:"; cat $tmpfile; }
  82
  83 exit $exitcode