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#!/usr/bin/env python
#
# This is a little script for testing the dispatcher and termination of
# subprocesses. It spawns several levels of itself, each instance just
# outputs an incrementing count until it is terminated.
import sys, os, time, signal
try:
import json as serialize
except:
import simplejson as serialize
def out(text):
sys.stdout.write(serialize.dumps(text) + '\n')
sys.stdout.flush()
def sigint(num, frame):
"""A handler for SIGINT. Tidy up properly and quit.
"""
out("!>INTERRUPTED %d" % level)
exit(1)
signal.signal(signal.SIGINT, sigint)
level = 3
while level > 0:
if os.fork():
break
time.sleep(1)
level -= 1
sys.stderr.write('%d: pid=%d ppid=%d pgrp=%d\n' % (level,
os.getpid(), os.getppid(), os.getpgrp()))
sys.stderr.flush()
time.sleep(5)
n = 0
while True:
n += 1
out('--%d: %04d' % (level, n))
time.sleep(4)
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