Use a hash:

# once again, adapted from perlipc

use vars qw( %status ); # our, if you prefer

sub REAPER {
  $waitedpid = wait;

  # now status is in $?
  $status{ $waitedpid } = $? >> 8;

  # loathe sysV: it makes us not only reinstate
  # the handler, but place it after the wait
  $SIG{CHLD} = \&REAPER;
}
$SIG{CHLD} = \&REAPER;

while ( my ($k,$v) = each %status ) {
  print "pid $k\tstatus $v\n"
}
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--sacked