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#!/usr/bin/env python
import os
import rdflib
import unittest
try:
import os.fork
import os.pipe
except ImportError:
from nose import SkipTest
raise SkipTest("No os.fork() and/or os.pipe() on this platform, skipping")
class TestRandomSeedInFork(unittest.TestCase):
def test_bnode_id_differs_in_fork(self):
"""Checks that os.fork()ed child processes produce a
different sequence of BNode ids from the parent process.
"""
r, w = os.pipe() # these are file descriptors, not file objects
pid = os.fork()
if pid:
pb1 = rdflib.term.BNode()
os.close(w) # use os.close() to close a file descriptor
r = os.fdopen(r) # turn r into a file object
txt = r.read()
os.waitpid(pid, 0) # make sure the child process gets cleaned up
else:
os.close(r)
w = os.fdopen(w, "w")
cb = rdflib.term.BNode()
w.write(cb)
w.close()
os._exit(0)
assert txt != str(pb1), (
"Parent process BNode id: "
+ "%s, child process BNode id: %s" % (txt, str(pb1))
)
if __name__ == "__main__":
unittest.main()
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