use generated random pipe_file_name instead of pid

The process pid is differs from the host and the child's point of view.
See #26 for more details. This, random generated pipe_file_name, whill solve this issue.

wexpect/__main__.py

@@ -30,6 +30,9 @@ def main():
         parser.add_argument('--port', type=int, help=
                             "If the console reader class is SpawnSocket, this option specifies the "
                             "socket's port.", default=False)
+        parser.add_argument('--pipe_file_name', type=str, help=
+                            "If the console reader class is SpawnPipe, this option specifies the "
+                            "pipe's name.", default=None)
 
         try:
             args = parser.parse_args()
@@ -48,7 +51,7 @@ def main():
         command = wexpect_util.join_args(args.command)
 
         cons = conole_reader_class(
-            path=command, host_pid=args.host_pid, codepage=args.codepage, port=args.port,
+            path=command, host_pid=args.host_pid, codepage=args.codepage, port=args.port, pipe_file_name=args.pipe_file_name,
             window_size_x=args.window_size_x, window_size_y=args.window_size_y,
             buffer_size_x=args.buffer_size_x, buffer_size_y=args.buffer_size_y,
             local_echo=wexpect_util.str2bool(args.local_echo), interact=wexpect_util.str2bool(args.interact))

wexpect/console_reader.py

@@ -515,8 +515,12 @@ class ConsoleReaderPipe(ConsoleReaderBase):
         else:
             end_time = time.time() + timeout
 
-        pipe_name = 'wexpect_{}'.format(self.console_pid)
-        pipe_full_path = r'\\.\pipe\{}'.format(pipe_name)
+        try:
+            self.pipe_name = kwargs['pipe_file_name']
+        except KeyError:
+            self.pipe_name = 'wexpect_{}'.format(self.console_pid)
+
+        pipe_full_path = r'\\.\pipe\{}'.format(self.pipe_name)
         logger.info('Start pipe server: %s', pipe_full_path)
         self.pipe = win32pipe.CreateNamedPipe(
             pipe_full_path,

wexpect/host.py

@@ -30,6 +30,7 @@ from .wexpect_util import join_args
 from .wexpect_util import init_logger
 from .wexpect_util import EOF_CHAR
 from .wexpect_util import SIGNAL_CHARS
+from .wexpect_util import generate_id
 
 logger = logging.getLogger('wexpect')
 
@@ -870,7 +871,8 @@ class SpawnPipe(SpawnBase):
                  **kwargs):
         self.pipe = None
         self.console_class_name = 'ConsoleReaderPipe'
-        self.console_class_parameters = {}
+        self.pipe_file_name = f'wexpect_{generate_id()}'
+        self.console_class_parameters = {'pipe_file_name': self.pipe_file_name}
 
         super().__init__(
             command=command, args=args, timeout=timeout, maxread=maxread,
@@ -889,8 +891,7 @@ class SpawnPipe(SpawnBase):
         else:
             end_time = time.time() + timeout
 
-        pipe_name = 'wexpect_{}'.format(self.console_pid)
-        pipe_full_path = r'\\.\pipe\{}'.format(pipe_name)
+        pipe_full_path = r'\\.\pipe\{}'.format(self.pipe_file_name)
         logger.debug(f'Trying to connect to pipe: {pipe_full_path}')
         while True:
             if end_time < time.time():

wexpect/wexpect_util.py

@@ -14,6 +14,8 @@ import sys
 import os
 import logging
 import signal
+import string
+import random
 
 # platform does not define VEOF so assume CTRL-D
 EOF_CHAR = b'\x04'
@@ -27,7 +29,19 @@ SPAM = 5
 logging.addLevelName(SPAM, "SPAM")
 
 
+def generate_id(size=6, chars=string.ascii_uppercase + string.digits):
+    '''Generates random string, to use as ID.
+    Using random string as pipe's filename gives a workaround to #26
+    From: https://stackoverflow.com/a/2257449/2506522
+    '''
+    return ''.join(random.choice(chars) for _ in range(size))
+
+
 def str2bool(v):
+    '''Help parsing boolean values with argparse
+    From: https://stackoverflow.com/a/43357954/2506522
+
+    '''
     if isinstance(v, bool):
        return v
     if v.lower() in ('yes', 'true', 't', 'y', '1'):