demoweb/venv/lib/python3.7/site-packages/twisted/test/process_tester.py

"""Test program for processes."""

import sys, os

# Twisted is unimportable from this file, so just do the PY3 check manually
if sys.version_info < (3, 0):
    _PY3 = False
else:
    _PY3 = True

test_file_match = "process_test.log.*"
test_file = "process_test.log.%d" % os.getpid()

def main():
    f = open(test_file, 'wb')

    if _PY3:
        stdin = sys.stdin.buffer
        stderr = sys.stderr.buffer
        stdout = sys.stdout.buffer
    else:
        stdin = sys.stdin
        stdout = sys.stdout
        stderr = sys.stderr

    # stage 1
    b = stdin.read(4)
    f.write(b"one: " + b + b"\n")

    # stage 2
    stdout.write(b)
    stdout.flush()
    os.close(sys.stdout.fileno())

    # and a one, and a two, and a...
    b = stdin.read(4)
    f.write(b"two: " + b + b"\n")

    # stage 3
    stderr.write(b)
    stderr.flush()
    os.close(stderr.fileno())

    # stage 4
    b = stdin.read(4)
    f.write(b"three: " + b + b"\n")

    # exit with status code 23
    sys.exit(23)


if __name__ == '__main__':
    main()