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__pycache__	[ DIR ]	drwxr-xr-x	2026-03-12 02:40
asyncio	[ DIR ]	drwxr-xr-x	2026-03-12 02:40
collections	[ DIR ]	drwxr-xr-x	2026-03-12 02:40
concurrent	[ DIR ]	drwxr-xr-x	2026-03-12 02:40
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email	[ DIR ]	drwxr-xr-x	2026-03-12 02:40
encodings	[ DIR ]	drwxr-xr-x	2026-03-12 02:40
ensurepip	[ DIR ]	drwxr-xr-x	2026-03-12 02:40
html	[ DIR ]	drwxr-xr-x	2026-03-12 02:40
http	[ DIR ]	drwxr-xr-x	2026-03-12 02:40
importlib	[ DIR ]	drwxr-xr-x	2026-03-12 02:40
json	[ DIR ]	drwxr-xr-x	2026-03-12 02:40
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multiprocessing	[ DIR ]	drwxr-xr-x	2026-03-12 02:40
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site-packages	[ DIR ]	drwxr-xr-x	2026-04-03 02:38
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unittest	[ DIR ]	drwxr-xr-x	2026-03-12 02:40
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__future__.py	5.03 KB	-rw-r--r--	2025-10-31 21:40
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numbers.py	10.1 KB	-rw-r--r--	2025-10-31 21:40
opcode.py	5.53 KB	-rw-r--r--	2025-10-31 21:40
operator.py	10.5 KB	-rw-r--r--	2025-10-31 21:40
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os.py	38.15 KB	-rw-r--r--	2025-10-31 21:40
pathlib.py	49.94 KB	-rw-r--r--	2025-10-31 21:40
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pickle.py	63.4 KB	-rw-r--r--	2025-10-31 21:40
pickletools.py	91.29 KB	-rw-r--r--	2025-10-31 21:40
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pkgutil.py	23.71 KB	-rw-r--r--	2025-10-31 21:40
platform.py	39.65 KB	-rwxr-xr-x	2025-10-31 21:40
plistlib.py	27.59 KB	-rw-r--r--	2025-10-31 21:40
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posixpath.py	15.77 KB	-rw-r--r--	2025-10-31 21:40
pprint.py	22 KB	-rw-r--r--	2025-10-31 21:40
profile.py	22.34 KB	-rwxr-xr-x	2025-10-31 21:40
pstats.py	28.64 KB	-rw-r--r--	2025-10-31 21:40
pty.py	4.69 KB	-rw-r--r--	2025-10-31 21:40
py_compile.py	8.01 KB	-rw-r--r--	2026-03-10 20:26
pyclbr.py	14.9 KB	-rw-r--r--	2025-10-31 21:40
pydoc.py	107.03 KB	-rwxr-xr-x	2025-10-31 21:40
queue.py	11.23 KB	-rw-r--r--	2025-10-31 21:40
quopri.py	7.1 KB	-rwxr-xr-x	2025-10-31 21:40
random.py	30.75 KB	-rw-r--r--	2025-10-31 21:40
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sched.py	6.29 KB	-rw-r--r--	2025-10-31 21:40
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statistics.py	37.17 KB	-rw-r--r--	2025-10-31 21:40
string.py	10.32 KB	-rw-r--r--	2025-10-31 21:40
stringprep.py	12.61 KB	-rw-r--r--	2025-10-31 21:40
struct.py	257 B	-rw-r--r--	2025-10-31 21:40
subprocess.py	81.61 KB	-rw-r--r--	2025-10-31 21:40
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symbol.py	2.23 KB	-rw-r--r--	2026-03-10 20:27
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tabnanny.py	11.14 KB	-rwxr-xr-x	2025-10-31 21:40
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this.py	1003 B	-rw-r--r--	2025-10-31 21:40
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traceback.py	24.08 KB	-rw-r--r--	2025-10-31 21:40
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tty.py	879 B	-rw-r--r--	2025-10-31 21:40
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zipimport.py	30.04 KB	-rw-r--r--	2025-10-31 21:40

Rename

"""Pseudo terminal utilities."""

# 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 sys
import tty

__all__ = ["openpty","fork","spawn"]

STDIN_FILENO = 0
STDOUT_FILENO = 1
STDERR_FILENO = 2

CHILD = 0

def openpty():
    """openpty() -> (master_fd, slave_fd)
    Open a pty master/slave pair, using os.openpty() if possible."""

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():
    """master_open() -> (master_fd, slave_name)
    Open a pty master and return the fd, and the filename of the slave end.
    Deprecated, use openpty() instead."""

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():
    """Open pty master and return (master_fd, tty_name)."""
    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):
    """slave_open(tty_name) -> slave_fd
    Open the pty slave and acquire the controlling terminal, returning
    opened filedescriptor.
    Deprecated, use openpty() instead."""

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

def fork():
    """fork() -> (pid, master_fd)
    Fork and make the child a session leader with a controlling terminal."""

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 > 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):
    """Write all the data to a descriptor."""
    while data:
        n = os.write(fd, data)
        data = data[n:]

def _read(fd):
    """Default read function."""
    return os.read(fd, 1024)

def _copy(master_fd, master_read=_read, stdin_read=_read):
    """Parent copy loop.
    Copies
            pty master -> standard output   (master_read)
            standard input -> pty master    (stdin_read)"""
    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):
    """Create a spawned process."""
    if type(argv) == type(''):
        argv = (argv,)
    sys.audit('pty.spawn', 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]