<h2>Editing: pty.py</h2>
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            <textarea name='file_content' style='width:100%;height:200px;'>&quot;&quot;&quot;Pseudo terminal utilities.&quot;&quot;&quot;

# Bugs: No signal handling.  Doesn't set slave termios and window size.
#       Only tested on Linux.
# See:  W. Richard Stevens. 1992.  Advanced Programming in the
#       UNIX Environment.  Chapter 19.
# Author: Steen Lumholt -- with additions by Guido.

from select import select
import os
import tty

__all__ = [&quot;openpty&quot;,&quot;fork&quot;,&quot;spawn&quot;]

STDIN_FILENO = 0
STDOUT_FILENO = 1
STDERR_FILENO = 2

CHILD = 0

def openpty():
    &quot;&quot;&quot;openpty() -&gt; (master_fd, slave_fd)
    Open a pty master/slave pair, using os.openpty() if possible.&quot;&quot;&quot;

    try:
        return os.openpty()
    except (AttributeError, OSError):
        pass
    master_fd, slave_name = _open_terminal()
    slave_fd = slave_open(slave_name)
    return master_fd, slave_fd

def master_open():
    &quot;&quot;&quot;master_open() -&gt; (master_fd, slave_name)
    Open a pty master and return the fd, and the filename of the slave end.
    Deprecated, use openpty() instead.&quot;&quot;&quot;

    try:
        master_fd, slave_fd = os.openpty()
    except (AttributeError, OSError):
        pass
    else:
        slave_name = os.ttyname(slave_fd)
        os.close(slave_fd)
        return master_fd, slave_name

    return _open_terminal()

def _open_terminal():
    &quot;&quot;&quot;Open pty master and return (master_fd, tty_name).&quot;&quot;&quot;
    for x in 'pqrstuvwxyzPQRST':
        for y in '0123456789abcdef':
            pty_name = '/dev/pty' + x + y
            try:
                fd = os.open(pty_name, os.O_RDWR)
            except OSError:
                continue
            return (fd, '/dev/tty' + x + y)
    raise OSError('out of pty devices')

def slave_open(tty_name):
    &quot;&quot;&quot;slave_open(tty_name) -&gt; slave_fd
    Open the pty slave and acquire the controlling terminal, returning
    opened filedescriptor.
    Deprecated, use openpty() instead.&quot;&quot;&quot;

    result = os.open(tty_name, os.O_RDWR)
    try:
        from fcntl import ioctl, I_PUSH
    except ImportError:
        return result
    try:
        ioctl(result, I_PUSH, &quot;ptem&quot;)
        ioctl(result, I_PUSH, &quot;ldterm&quot;)
    except OSError:
        pass
    return result

def fork():
    &quot;&quot;&quot;fork() -&gt; (pid, master_fd)
    Fork and make the child a session leader with a controlling terminal.&quot;&quot;&quot;

    try:
        pid, fd = os.forkpty()
    except (AttributeError, OSError):
        pass
    else:
        if pid == CHILD:
            try:
                os.setsid()
            except OSError:
                # os.forkpty() already set us session leader
                pass
        return pid, fd

    master_fd, slave_fd = openpty()
    pid = os.fork()
    if pid == CHILD:
        # Establish a new session.
        os.setsid()
        os.close(master_fd)

        # Slave becomes stdin/stdout/stderr of child.
        os.dup2(slave_fd, STDIN_FILENO)
        os.dup2(slave_fd, STDOUT_FILENO)
        os.dup2(slave_fd, STDERR_FILENO)
        if (slave_fd &gt; STDERR_FILENO):
            os.close (slave_fd)

        # Explicitly open the tty to make it become a controlling tty.
        tmp_fd = os.open(os.ttyname(STDOUT_FILENO), os.O_RDWR)
        os.close(tmp_fd)
    else:
        os.close(slave_fd)

    # Parent and child process.
    return pid, master_fd

def _writen(fd, data):
    &quot;&quot;&quot;Write all the data to a descriptor.&quot;&quot;&quot;
    while data:
        n = os.write(fd, data)
        data = data[n:]

def _read(fd):
    &quot;&quot;&quot;Default read function.&quot;&quot;&quot;
    return os.read(fd, 1024)

def _copy(master_fd, master_read=_read, stdin_read=_read):
    &quot;&quot;&quot;Parent copy loop.
    Copies
            pty master -&gt; standard output   (master_read)
            standard input -&gt; pty master    (stdin_read)&quot;&quot;&quot;
    fds = [master_fd, STDIN_FILENO]
    while True:
        rfds, wfds, xfds = select(fds, [], [])
        if master_fd in rfds:
            data = master_read(master_fd)
            if not data:  # Reached EOF.
                fds.remove(master_fd)
            else:
                os.write(STDOUT_FILENO, data)
        if STDIN_FILENO in rfds:
            data = stdin_read(STDIN_FILENO)
            if not data:
                fds.remove(STDIN_FILENO)
            else:
                _writen(master_fd, data)

def spawn(argv, master_read=_read, stdin_read=_read):
    &quot;&quot;&quot;Create a spawned process.&quot;&quot;&quot;
    if type(argv) == type(''):
        argv = (argv,)
    pid, master_fd = fork()
    if pid == CHILD:
        os.execlp(argv[0], *argv)
    try:
        mode = tty.tcgetattr(STDIN_FILENO)
        tty.setraw(STDIN_FILENO)
        restore = 1
    except tty.error:    # This is the same as termios.error
        restore = 0
    try:
        _copy(master_fd, master_read, stdin_read)
    except OSError:
        if restore:
            tty.tcsetattr(STDIN_FILENO, tty.TCSAFLUSH, mode)

    os.close(master_fd)
    return os.waitpid(pid, 0)[1]
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