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//usr/lib/python2.4/test/tf_inherit_check.py
# Helper script for test_tempfile.py. argv[2] is the number of a file # descriptor which should _not_ be open. Check this by attempting to # write to it -- if we succeed, something is wrong. import sys import os verbose = (sys.argv[1] == 'v') try: fd = int(sys.argv[2]) try: os.write(fd, "blat") except os.error: # Success -- could not write to fd. sys.exit(0) else: if verbose: sys.stderr.write("fd %d is open in child" % fd) sys.exit(1) except StandardError: if verbose: raise sys.exit(1)