lib/Tools/mkfifo

added polyml_pp.ML: toplevel pretty printing for Poly/ML 4.x and 5.x before 5.3;

#!/usr/bin/env bash
#
# Author: Makarius
#
# DESCRIPTION: create named pipe


PRG="$(basename "$0")"

function usage()
{
  echo
  echo "Usage: isabelle $PRG"
  echo
  echo "  Create a temporary named pipe and return its name."
  echo
  exit 1
}

function fail()
{
  echo "$1" >&2
  exit 2
}


## main

[ "$#" != 0 ] && usage

FIFO="/tmp/isabelle-fifo$$"
mkfifo -m 600 "$FIFO" || fail "Failed to create named pipe $FIFO"
echo "$FIFO"