first add files

lib/ptyprocess/_fork_pty.py

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+"""Substitute for the forkpty system call, to support Solaris.
+"""
+import os
+import errno
+
+from pty import (STDIN_FILENO, STDOUT_FILENO, STDERR_FILENO, CHILD)
+from .util import PtyProcessError
+
+def fork_pty():
+    '''This implements a substitute for the forkpty system call. This
+    should be more portable than the pty.fork() function. Specifically,
+    this should work on Solaris.
+
+    Modified 10.06.05 by Geoff Marshall: Implemented __fork_pty() method to
+    resolve the issue with Python's pty.fork() not supporting Solaris,
+    particularly ssh. Based on patch to posixmodule.c authored by Noah
+    Spurrier::
+
+        http://mail.python.org/pipermail/python-dev/2003-May/035281.html
+
+    '''
+
+    parent_fd, child_fd = os.openpty()
+    if parent_fd < 0 or child_fd < 0:
+        raise OSError("os.openpty() failed")
+
+    pid = os.fork()
+    if pid == CHILD:
+        # Child.
+        os.close(parent_fd)
+        pty_make_controlling_tty(child_fd)
+
+        os.dup2(child_fd, STDIN_FILENO)
+        os.dup2(child_fd, STDOUT_FILENO)
+        os.dup2(child_fd, STDERR_FILENO)
+
+    else:
+        # Parent.
+        os.close(child_fd)
+
+    return pid, parent_fd
+
+def pty_make_controlling_tty(tty_fd):
+    '''This makes the pseudo-terminal the controlling tty. This should be
+    more portable than the pty.fork() function. Specifically, this should
+    work on Solaris. '''
+
+    child_name = os.ttyname(tty_fd)
+
+    # Disconnect from controlling tty, if any.  Raises OSError of ENXIO
+    # if there was no controlling tty to begin with, such as when
+    # executed by a cron(1) job.
+    try:
+        fd = os.open("/dev/tty", os.O_RDWR | os.O_NOCTTY)
+        os.close(fd)
+    except OSError as err:
+        if err.errno != errno.ENXIO:
+            raise
+
+    os.setsid()
+
+    # Verify we are disconnected from controlling tty by attempting to open
+    # it again.  We expect that OSError of ENXIO should always be raised.
+    try:
+        fd = os.open("/dev/tty", os.O_RDWR | os.O_NOCTTY)
+        os.close(fd)
+        raise PtyProcessError("OSError of errno.ENXIO should be raised.")
+    except OSError as err:
+        if err.errno != errno.ENXIO:
+            raise
+
+    # Verify we can open child pty.
+    fd = os.open(child_name, os.O_RDWR)
+    os.close(fd)
+
+    # Verify we now have a controlling tty.
+    fd = os.open("/dev/tty", os.O_WRONLY)
+    os.close(fd)