Python os.getpgrp() Examples

def _is_daemon():
    # The process group for a foreground process will match the
    # process group of the controlling terminal. If those values do
    # not match, or ioctl() fails on the stdout file handle, we assume
    # the process is running in the background as a daemon.
    # http://www.gnu.org/software/bash/manual/bashref.html#Job-Control-Basics
    try:
        is_daemon = os.getpgrp() != os.tcgetpgrp(sys.stdout.fileno())
    except io.UnsupportedOperation:
        # Could not get the fileno for stdout, so we must be a daemon.
        is_daemon = True
    except OSError as err:
        if err.errno == errno.ENOTTY:
            # Assume we are a daemon because there is no terminal.
            is_daemon = True
        else:
            raise
    return is_daemon 

def _check_ioctl_mutate_len(self, nbytes=None):
        buf = array.array('i')
        intsize = buf.itemsize
        ids = (os.getpgrp(), os.getsid(0))
        # A fill value unlikely to be in `ids`
        fill = -12345
        if nbytes is not None:
            # Extend the buffer so that it is exactly `nbytes` bytes long
            buf.extend([fill] * (nbytes // intsize))
            self.assertEqual(len(buf) * intsize, nbytes)   # sanity check
        else:
            buf.append(fill)
        with open("/dev/tty", "r") as tty:
            r = fcntl.ioctl(tty, termios.TIOCGPGRP, buf, 1)
        rpgrp = buf[0]
        self.assertEqual(r, 0)
        self.assertIn(rpgrp, ids) 

def _check_ioctl_mutate_len(self, nbytes=None):
        buf = array.array('i')
        intsize = buf.itemsize
        ids = (os.getpgrp(), os.getsid(0))
        # A fill value unlikely to be in `ids`
        fill = -12345
        if nbytes is not None:
            # Extend the buffer so that it is exactly `nbytes` bytes long
            buf.extend([fill] * (nbytes // intsize))
            self.assertEqual(len(buf) * intsize, nbytes)   # sanity check
        else:
            buf.append(fill)
        with open("/dev/tty", "rb") as tty:
            r = fcntl.ioctl(tty, termios.TIOCGPGRP, buf, 1)
        rpgrp = buf[0]
        self.assertEqual(r, 0)
        self.assertIn(rpgrp, ids) 

def check_dir(self, out_dir):
        if os.path.exists(out_dir):
            #check if the process is run in background
            try: 
                if os.getpgrp() == os.tcgetpgrp(sys.stdout.fileno()):
                    print  self.user_message % out_dir
                    user_input = raw_input()
                    while user_input not in ["1", "2", "3"]:
                        user_input = raw_input().strip()
                    if user_input == "1":
                        return False 
                    if user_input == "2":
                        shutil.rmtree(out_dir)
                        os.mkdir(out_dir)
                        return True 
                    if user_input == "3":
                        sys.exit(1)
                else:
                    sys.stderr.write(self.error_message % out_dir)
            except OSError:
                    sys.stderr.write(self.error_message % out_dir)
        else: 
            os.mkdir(out_dir)
            return True 

def _check_ioctl_mutate_len(self, nbytes=None):
        buf = array.array('i')
        intsize = buf.itemsize
        ids = (os.getpgrp(), os.getsid(0))
        # A fill value unlikely to be in `ids`
        fill = -12345
        if nbytes is not None:
            # Extend the buffer so that it is exactly `nbytes` bytes long
            buf.extend([fill] * (nbytes // intsize))
            self.assertEqual(len(buf) * intsize, nbytes)   # sanity check
        else:
            buf.append(fill)
        with open("/dev/tty", "r") as tty:
            r = fcntl.ioctl(tty, termios.TIOCGPGRP, buf, 1)
        rpgrp = buf[0]
        self.assertEqual(r, 0)
        self.assertIn(rpgrp, ids) 

def _check_ioctl_mutate_len(self, nbytes=None):
        buf = array.array('i')
        intsize = buf.itemsize
        ids = (os.getpgrp(), os.getsid(0))
        # A fill value unlikely to be in `ids`
        fill = -12345
        if nbytes is not None:
            # Extend the buffer so that it is exactly `nbytes` bytes long
            buf.extend([fill] * (nbytes // intsize))
            self.assertEqual(len(buf) * intsize, nbytes)   # sanity check
        else:
            buf.append(fill)
        with open("/dev/tty", "rb") as tty:
            r = fcntl.ioctl(tty, termios.TIOCGPGRP, buf, 1)
        rpgrp = buf[0]
        self.assertEqual(r, 0)
        self.assertIn(rpgrp, ids) 

def execute(self,dt):
        if self.finished: return "finished"
        if not self.running:
            self.process = Process(target = executeInProcessGroup, args = (self,))
            self.process.start()
            print "timeshare child PID:",self.process.pid
            os.setpgid(self.process.pid,self.process.pid)
            print "timeshare process group",os.getpgid(self.process.pid)
            assert os.getpgid(self.process.pid) == self.process.pid
            print "my process group",os.getpgrp(),"which should be",os.getpgid(0)
            assert os.getpgid(self.process.pid) != os.getpgid(0)
            self.running = True
        else:
            os.killpg(self.process.pid, signal.SIGCONT)
        
        self.process.join(dt)
        if self.process.is_alive():
            os.killpg(self.process.pid, signal.SIGSTOP)
            return "still running"
        else:
            self.finished = True
            return self.q.get() 

def _check_ioctl_mutate_len(self, nbytes=None):
        buf = array.array('i')
        intsize = buf.itemsize
        ids = (os.getpgrp(), os.getsid(0))
        # A fill value unlikely to be in `ids`
        fill = -12345
        if nbytes is not None:
            # Extend the buffer so that it is exactly `nbytes` bytes long
            buf.extend([fill] * (nbytes // intsize))
            self.assertEqual(len(buf) * intsize, nbytes)   # sanity check
        else:
            buf.append(fill)
        with open("/dev/tty", "r") as tty:
            r = fcntl.ioctl(tty, termios.TIOCGPGRP, buf, 1)
        rpgrp = buf[0]
        self.assertEqual(r, 0)
        self.assertIn(rpgrp, ids) 

def _check_ioctl_mutate_len(self, nbytes=None):
        buf = array.array('i')
        intsize = buf.itemsize
        ids = (os.getpgrp(), os.getsid(0))
        # A fill value unlikely to be in `ids`
        fill = -12345
        if nbytes is not None:
            # Extend the buffer so that it is exactly `nbytes` bytes long
            buf.extend([fill] * (nbytes // intsize))
            self.assertEqual(len(buf) * intsize, nbytes)   # sanity check
        else:
            buf.append(fill)
        with open("/dev/tty", "rb") as tty:
            r = fcntl.ioctl(tty, termios.TIOCGPGRP, buf, 1)
        rpgrp = buf[0]
        self.assertEqual(r, 0)
        self.assertIn(rpgrp, ids) 

def _check_ioctl_mutate_len(self, nbytes=None):
        buf = array.array('i')
        intsize = buf.itemsize
        ids = (os.getpgrp(), os.getsid(0))
        # A fill value unlikely to be in `ids`
        fill = -12345
        if nbytes is not None:
            # Extend the buffer so that it is exactly `nbytes` bytes long
            buf.extend([fill] * (nbytes // intsize))
            self.assertEqual(len(buf) * intsize, nbytes)   # sanity check
        else:
            buf.append(fill)
        with open("/dev/tty", "rb") as tty:
            r = fcntl.ioctl(tty, termios.TIOCGPGRP, buf, 1)
        rpgrp = buf[0]
        self.assertEqual(r, 0)
        self.assertIn(rpgrp, ids) 

def _check_ioctl_mutate_len(self, nbytes=None):
        buf = array.array('i')
        intsize = buf.itemsize
        ids = (os.getpgrp(), os.getsid(0))
        # A fill value unlikely to be in `ids`
        fill = -12345
        if nbytes is not None:
            # Extend the buffer so that it is exactly `nbytes` bytes long
            buf.extend([fill] * (nbytes // intsize))
            self.assertEqual(len(buf) * intsize, nbytes)   # sanity check
        else:
            buf.append(fill)
        with open("/dev/tty", "r") as tty:
            r = fcntl.ioctl(tty, termios.TIOCGPGRP, buf, 1)
        rpgrp = buf[0]
        self.assertEqual(r, 0)
        self.assertIn(rpgrp, ids) 

def _check_ioctl_mutate_len(self, nbytes=None):
        buf = array.array('i')
        intsize = buf.itemsize
        ids = (os.getpgrp(), os.getsid(0))
        # A fill value unlikely to be in `ids`
        fill = -12345
        if nbytes is not None:
            # Extend the buffer so that it is exactly `nbytes` bytes long
            buf.extend([fill] * (nbytes // intsize))
            self.assertEqual(len(buf) * intsize, nbytes)   # sanity check
        else:
            buf.append(fill)
        with open("/dev/tty", "r") as tty:
            r = fcntl.ioctl(tty, termios.TIOCGPGRP, buf, 1)
        rpgrp = buf[0]
        self.assertEqual(r, 0)
        self.assertIn(rpgrp, ids) 

def _check_ioctl_mutate_len(self, nbytes=None):
        buf = array.array('i')
        intsize = buf.itemsize
        ids = (os.getpgrp(), os.getsid(0))
        # A fill value unlikely to be in `ids`
        fill = -12345
        if nbytes is not None:
            # Extend the buffer so that it is exactly `nbytes` bytes long
            buf.extend([fill] * (nbytes // intsize))
            self.assertEqual(len(buf) * intsize, nbytes)   # sanity check
        else:
            buf.append(fill)
        with open("/dev/tty", "r") as tty:
            r = fcntl.ioctl(tty, termios.TIOCGPGRP, buf, 1)
        rpgrp = buf[0]
        self.assertEqual(r, 0)
        self.assertIn(rpgrp, ids) 

def test_ioctl(self):
        # If this process has been put into the background, TIOCGPGRP returns
        # the session ID instead of the process group id.
        ids = (os.getpgrp(), os.getsid(0))
        with open("/dev/tty", "rb") as tty:
            r = fcntl.ioctl(tty, termios.TIOCGPGRP, "    ")
            rpgrp = struct.unpack("i", r)[0]
            self.assertIn(rpgrp, ids) 

def test_ioctl(self):
        # If this process has been put into the background, TIOCGPGRP returns
        # the session ID instead of the process group id.
        ids = (os.getpgrp(), os.getsid(0))
        tty = open("/dev/tty", "r")
        r = fcntl.ioctl(tty, termios.TIOCGPGRP, "    ")
        rpgrp = struct.unpack("i", r)[0]
        self.assertIn(rpgrp, ids) 

def test_ioctl(self):
        # If this process has been put into the background, TIOCGPGRP returns
        # the session ID instead of the process group id.
        ids = (os.getpgrp(), os.getsid(0))
        tty = open("/dev/tty", "r")
        r = fcntl.ioctl(tty, termios.TIOCGPGRP, "    ")
        rpgrp = struct.unpack("i", r)[0]
        self.assertIn(rpgrp, ids) 

def test_ioctl(self):
        # If this process has been put into the background, TIOCGPGRP returns
        # the session ID instead of the process group id.
        ids = (os.getpgrp(), os.getsid(0))
        with open("/dev/tty", "rb") as tty:
            r = fcntl.ioctl(tty, termios.TIOCGPGRP, "    ")
            rpgrp = struct.unpack("i", r)[0]
            self.assertIn(rpgrp, ids) 

def determine_interactive(self):
		"""Determine whether we're in an interactive shell.
		Sets interactivity off if appropriate.
		cf http://stackoverflow.com/questions/24861351/how-to-detect-if-python-script-is-being-run-as-a-background-process
		"""
		try:
			if not sys.stdout.isatty() or os.getpgrp() != os.tcgetpgrp(sys.stdout.fileno()):
				self.interactive = 0
				return False
		except Exception:
			self.interactive = 0
			return False
		if self.interactive == 0:
			return False
		return True 

def _save_gpid():

    plat = str(platform.system())
    if plat == 'Windows':
        gpid = os.getpid()
    else:   # unix
        gpid = os.getpgrp() if USE_GPID else os.getpid()
    print( 'gpid={}'.format(gpid))

    with open(gpid_file, 'w') as f:
        f.write(str(gpid))

    print(u'wrote gpid file:{}'.format(gpid_file)) 

def test_ioctl(self):
        # If this process has been put into the background, TIOCGPGRP returns
        # the session ID instead of the process group id.
        ids = (os.getpgrp(), os.getsid(0))
        tty = open("/dev/tty", "r")
        r = fcntl.ioctl(tty, termios.TIOCGPGRP, "    ")
        rpgrp = struct.unpack("i", r)[0]
        self.assertIn(rpgrp, ids) 

def switch_pgid(self):
        try:
            if os.getpgrp() != os.tcgetpgrp(0):
                self.__old_pgid = os.getpgrp()
                os.setpgid(0, os.tcgetpgrp(0))
            else:
                self.__old_pgid = None
        except OSError:
            self.__old_pgid = None 

def switch_pgid(self):
        try:
            if os.getpgrp() != os.tcgetpgrp(0):
                self.__old_pgid = os.getpgrp()
                os.setpgid(0, os.tcgetpgrp(0))
            else:
                self.__old_pgid = None
        except OSError:
            self.__old_pgid = None 

def _controlTerminal(self):
        try:
            # the child should control stdin -- if stdin is a tty
            # that can be controlled
            if sys.stdin.isatty():
                os.tcsetpgrp(0, os.getpgrp())
        except AttributeError:
           # stdin might not even have an isatty method
            pass 

def test_ioctl_mutate(self):
        import array
        buf = array.array('i', [0])
        ids = (os.getpgrp(), os.getsid(0))
        tty = open("/dev/tty", "r")
        r = fcntl.ioctl(tty, termios.TIOCGPGRP, buf, 1)
        rpgrp = buf[0]
        self.assertEquals(r, 0)
        self.assert_(rpgrp in ids, "%s not in %s" % (rpgrp, ids)) 

def test_ioctl(self):
        # If this process has been put into the background, TIOCGPGRP returns
        # the session ID instead of the process group id.
        ids = (os.getpgrp(), os.getsid(0))
        tty = open("/dev/tty", "r")
        r = fcntl.ioctl(tty, termios.TIOCGPGRP, "    ")
        rpgrp = struct.unpack("i", r)[0]
        self.assert_(rpgrp in ids, "%s not in %s" % (rpgrp, ids)) 

def test_ioctl(self):
        # If this process has been put into the background, TIOCGPGRP returns
        # the session ID instead of the process group id.
        ids = (os.getpgrp(), os.getsid(0))
        tty = open("/dev/tty", "r")
        r = fcntl.ioctl(tty, termios.TIOCGPGRP, "    ")
        rpgrp = struct.unpack("i", r)[0]
        self.assertIn(rpgrp, ids) 

def _GetPidForLock():
    """Returns the PID used for host_forwarder initialization.

    The PID of the "sharder" is used to handle multiprocessing. The "sharder"
    is the initial process that forks that is the parent process.
    """
    return os.getpgrp() 

def test_ioctl(self):
        # If this process has been put into the background, TIOCGPGRP returns
        # the session ID instead of the process group id.
        ids = (os.getpgrp(), os.getsid(0))
        tty = open("/dev/tty", "r")
        r = fcntl.ioctl(tty, termios.TIOCGPGRP, "    ")
        rpgrp = struct.unpack("i", r)[0]
        self.assertIn(rpgrp, ids) 

def test_ioctl(self):
        # If this process has been put into the background, TIOCGPGRP returns
        # the session ID instead of the process group id.
        ids = (os.getpgrp(), os.getsid(0))
        tty = open("/dev/tty", "r")
        r = fcntl.ioctl(tty, termios.TIOCGPGRP, "    ")
        rpgrp = struct.unpack("i", r)[0]
        self.assertIn(rpgrp, ids) 

def start_reaper(fate_share=None):
    """Start the reaper process.

    This is a lightweight process that simply
    waits for its parent process to die and then terminates its own
    process group. This allows us to ensure that ray processes are always
    terminated properly so long as that process itself isn't SIGKILLed.

    Returns:
        ProcessInfo for the process that was started.
    """
    # Make ourselves a process group leader so that the reaper can clean
    # up other ray processes without killing the process group of the
    # process that started us.
    try:
        if sys.platform != "win32":
            os.setpgrp()
    except OSError as e:
        errcode = e.errno
        if errcode == errno.EPERM and os.getpgrp() == os.getpid():
            # Nothing to do; we're already a session leader.
            pass
        else:
            logger.warning("setpgrp failed, processes may not be "
                           "cleaned up properly: {}.".format(e))
            # Don't start the reaper in this case as it could result in killing
            # other user processes.
            return None

    reaper_filepath = os.path.join(
        os.path.dirname(os.path.abspath(__file__)), "ray_process_reaper.py")
    command = [sys.executable, "-u", reaper_filepath]
    process_info = start_ray_process(
        command,
        ray_constants.PROCESS_TYPE_REAPER,
        pipe_stdin=True,
        fate_share=fate_share)
    return process_info