Python subprocesses

subprocess.py

def run_openssl(data):
    env = os.environ.copy()
    env[‘password’] = b’\xe24U\n\xd0Ql3S\x11’
    proc = subprocess.Popen(
        [‘openssl’, ‘enc’, ‘-des3’, ‘-pass’, ‘env:password’],
        env=env,
        stdin=subprocess.PIPE,
        stdout=subprocess.PIPE)
    proc.stdin.write(data)
    proc.stdin.flush()  # Ensure the child gets input
    return proc

# Run some processes and WAIT for them
procs = []
for _ in range(3):
   data = os.urandom(10)
   proc = run_openssl(data)
   procs.append(proc)

for proc in procs:
    out, err = proc.communicate() # Wait for them
    print(out[-10:])

# Wait with timeout
proc = run_sleep(10)
try:
   proc.communicate(timeout=0.1)
except subprocess.TimeoutExpired:
   proc.terminate()
   proc.wait()
print(‘Exit status’, proc.poll())