lib/Tools/mkfifo

Isabelle_System.mk_fifo: more robust enumeration of unique names, based on persisting JVM pid (parent of shell process);

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


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

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

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


## main

SUFFIX=""
[ "$#" != 0 ] && { SUFFIX="-$1"; shift; }

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

FIFO="/tmp/isabelle-fifo${PPID}${SUFFIX}"

mkfifo -m 600 "$FIFO" || fail "Failed to create fifo: $FIFO"
echo "$FIFO"