util/ProcessLogger.py
author Edouard Tisserant
Tue, 23 Oct 2018 13:36:07 +0200
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parent 1919 ccea0fa6ea91
child 2671 30493ff3a23a
permissions -rw-r--r--
Small cosmetic change to enhance readability and avoid confusion.
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#!/usr/bin/env python
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# -*- coding: utf-8 -*-
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# This file is part of Beremiz, a Integrated Development Environment for
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# programming IEC 61131-3 automates supporting plcopen standard and CanFestival.
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#
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# Copyright (C) 2007: Edouard TISSERANT and Laurent BESSARD
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#
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# See COPYING file for copyrights details.
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#
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# This program is free software; you can redistribute it and/or
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# modify it under the terms of the GNU General Public License
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# as published by the Free Software Foundation; either version 2
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# of the License, or (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
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from __future__ import absolute_import
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import os
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import sys
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import subprocess
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import ctypes
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from threading import Timer, Lock, Thread, Semaphore
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import signal
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class outputThread(Thread):
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    """
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    Thread is used to print the output of a command to the stdout
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    """
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    def __init__(self, Proc, fd, callback=None, endcallback=None):
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        Thread.__init__(self)
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        self.killed = False
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        self.finished = False
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        self.retval = None
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        self.Proc = Proc
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        self.callback = callback
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        self.endcallback = endcallback
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        self.fd = fd
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    def run(self):
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        outchunk = None
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        self.retval = None
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        while self.retval is None and not self.killed:
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            if self.endcallback:
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                self.retval = self.Proc.poll()
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            else:
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                self.retval = self.Proc.returncode
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            outchunk = self.fd.readline()
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            if self.callback:
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                self.callback(outchunk)
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        while outchunk != '' and not self.killed:
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            outchunk = self.fd.readline()
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            if self.callback:
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                self.callback(outchunk)
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        if self.endcallback:
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            try:
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                err = self.Proc.wait()
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            except Exception:
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                err = self.retval
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            self.finished = True
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            self.endcallback(self.Proc.pid, err)
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class ProcessLogger(object):
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    def __init__(self, logger, Command, finish_callback=None,
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                 no_stdout=False, no_stderr=False, no_gui=True,
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                 timeout=None, outlimit=None, errlimit=None,
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                 endlog=None, keyword=None, kill_it=False, cwd=None,
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                 encoding=None, output_encoding=None):
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        self.logger = logger
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        if not isinstance(Command, list):
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            self.Command_str = Command
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            self.Command = []
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            for i, word in enumerate(Command.replace("'", '"').split('"')):
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                if i % 2 == 0:
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                    word = word.strip()
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                    if len(word) > 0:
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                        self.Command.extend(word.split())
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                else:
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                    self.Command.append(word)
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        else:
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            self.Command = Command
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            self.Command_str = subprocess.list2cmdline(self.Command)
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        fsencoding = sys.getfilesystemencoding()
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        self.output_encoding = output_encoding
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        if encoding is None:
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            encoding = fsencoding
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        self.Command = [self.Command[0].encode(fsencoding)]+map(
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            lambda x: x.encode(encoding), self.Command[1:])
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        self.finish_callback = finish_callback
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        self.no_stdout = no_stdout
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        self.no_stderr = no_stderr
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        self.startupinfo = None
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        self.errlen = 0
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        self.outlen = 0
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        self.errlimit = errlimit
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        self.outlimit = outlimit
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        self.exitcode = None
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        self.outdata = []
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        self.errdata = []
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        self.keyword = keyword
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        self.kill_it = kill_it
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        self.startsem = Semaphore(0)
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        self.finishsem = Semaphore(0)
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        self.endlock = Lock()
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        popenargs = {
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            "cwd":    os.getcwd() if cwd is None else cwd,
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            "stdin":  subprocess.PIPE,
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            "stdout": subprocess.PIPE,
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            "stderr": subprocess.PIPE
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        }
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        if no_gui and os.name in ("nt", "ce"):
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            self.startupinfo = subprocess.STARTUPINFO()
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            self.startupinfo.dwFlags |= subprocess.STARTF_USESHOWWINDOW
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            popenargs["startupinfo"] = self.startupinfo
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        elif os.name == 'posix':
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            popenargs["shell"] = False
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        if timeout:
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            self.timeout = Timer(timeout, self.endlog)
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            self.timeout.start()
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        else:
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            self.timeout = None
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        self.Proc = subprocess.Popen(self.Command, **popenargs)
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        self.outt = outputThread(
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            self.Proc,
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            self.Proc.stdout,
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            self.output,
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            self.finish)
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        self.outt.start()
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        self.errt = outputThread(
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            self.Proc,
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            self.Proc.stderr,
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            self.errors)
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        self.errt.start()
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        self.startsem.release()
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    def output(self, v):
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        if v and self.output_encoding:
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            v = v.decode(self.output_encoding)
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        self.outdata.append(v)
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        self.outlen += 1
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        if not self.no_stdout:
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            self.logger.write(v)
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        if (self.keyword and v.find(self.keyword) != -1) or (self.outlimit and self.outlen > self.outlimit):
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            self.endlog()
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    def errors(self, v):
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        if v and self.output_encoding:
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            v = v.decode(self.output_encoding)
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        self.errdata.append(v)
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        self.errlen += 1
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        if not self.no_stderr:
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            self.logger.write_warning(v)
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        if self.errlimit and self.errlen > self.errlimit:
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            self.endlog()
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    def log_the_end(self, ecode, pid):
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        self.logger.write(self.Command_str + "\n")
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        self.logger.write_warning(_("exited with status {a1} (pid {a2})\n").format(a1=str(ecode), a2=str(pid)))
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    def finish(self, pid, ecode):
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        # avoid running function before start is finished
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        self.startsem.acquire()
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        self.startsem.release()
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        if self.timeout:
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            self.timeout.cancel()
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        self.exitcode = ecode
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        if self.exitcode != 0:
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            self.log_the_end(ecode, pid)
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        if self.finish_callback is not None:
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            self.finish_callback(self, ecode, pid)
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        self.errt.join()
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        self.finishsem.release()
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    def kill(self, gently=True):
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        # avoid running kill before start is finished
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        self.startsem.acquire()
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        self.startsem.release()
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        self.outt.killed = True
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        self.errt.killed = True
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        if os.name in ("nt", "ce"):
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            PROCESS_TERMINATE = 1
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            handle = ctypes.windll.kernel32.OpenProcess(PROCESS_TERMINATE, False, self.Proc.pid)
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            ctypes.windll.kernel32.TerminateProcess(handle, -1)
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            ctypes.windll.kernel32.CloseHandle(handle)
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        else:
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            if gently:
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                sig = signal.SIGTERM
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            else:
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                sig = signal.SIGKILL
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            try:
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                os.kill(self.Proc.pid, sig)
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            except Exception:
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                pass
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        self.outt.join()
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        self.errt.join()
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    def endlog(self):
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        if self.endlock.acquire(False):
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            if not self.outt.finished and self.kill_it:
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                self.kill()
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            self.finishsem.release()
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    def spin(self):
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        self.finishsem.acquire()
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        return [self.exitcode, "".join(self.outdata), "".join(self.errdata)]