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#
# Copyright © 2012 Intel Corporation
#
# Permission is hereby granted, free of charge, to any person obtaining a
# copy of this software and associated documentation files (the "Software"),
# to deal in the Software without restriction, including without limitation
# the rights to use, copy, modify, merge, publish, distribute, sublicense,
# and/or sell copies of the Software, and to permit persons to whom the
# Software is furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice (including the next
# paragraph) shall be included in all copies or substantial portions of the
# Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
# THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
# FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
# IN THE SOFTWARE.
#
import os
import sys
import time
from subprocess import Popen, PIPE, TimeoutExpired
from threading import Thread

__all__ = ['runProgram']

def runProgram(cmd, timeout, env = None):
    '''Run a program with a timeout in case it never terminates.

    cmd -- List of command and arguments.  See subprocess.Popen.
    timeout -- Fractional number of seconds to wait before killing the program.
    env -- A dictionary containing additional environment variables to set.

    Returns a 4-tuple: (stdout, stderr, return code, <finished before timeout>)
    '''

    if env:
        fullEnv = os.environ.copy()
        fullEnv.update(env)
    else:
        fullEnv = os.environ

    out = ''
    err = ''
    try:
        proc = Popen(cmd, stdout=PIPE, stderr=PIPE, env=fullEnv,
                     start_new_session=True, universal_newlines=True)
        out, err = proc.communicate(timeout=timeout)
        return (out, err, proc.returncode, True)
    except TimeoutExpired:
        return (out, err, proc.returncode, False)