import os
import signal
from subprocess import Popen, PIPE, STDOUT

proc = Popen(['/usr/sbin/tracepath', 'www.google.com'], bufsize=0,
    stdout=PIPE, stderr=PIPE, close_fds=True)

def handler(signum, frame):
    os.kill(proc.pid, signal.SIGINT)

signal.signal(signal.SIGALRM, handler)
signal.alarm(5)
try:
    out, err = proc.communicate()
finally:
    signal.alarm(0)

print out
print err