Personal Computer World 2009 February/PCWFEB09.iso/Software/Linux/Kubuntu 8.10/kubuntu-8.10-desktop-i386.iso/casper/filesystem.squashfs/usr/lib/python2.5/pty.pyc

Python Compiled Bytecode | 2008-10-29 | 5KB | 204 lines

# Source Generated with Decompyle++
# File: in.pyc (Python 2.5)

'''Pseudo terminal utilities.'''
from select import select
import os
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

    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).
    SGI and generic BSD version, for when openpty() fails.'''

    try:
        import sgi as sgi
    except ImportError:
        pass


    try:
        (tty_name, master_fd) = sgi._getpty(os.O_RDWR, 438, 0)
    except IOError:
        msg = None
        raise os.error, msg

    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 os.error:
                continue

            return (fd, '/dev/tty' + x + y)


    raise os.error, '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:
        ioctl = ioctl
        I_PUSH = I_PUSH
        import fcntl
    except ImportError:
        return result


    try:
        ioctl(result, I_PUSH, 'ptem')
        ioctl(result, I_PUSH, 'ldterm')
    except IOError:
        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

    if pid == CHILD:

        try:
            os.setsid()
        except OSError:
            pass
        except:
            None<EXCEPTION MATCH>OSError


    None<EXCEPTION MATCH>OSError
    return (pid, fd)
    (master_fd, slave_fd) = openpty()
    pid = os.fork()
    if pid == CHILD:
        os.setsid()
        os.close(master_fd)
        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)

        tmp_fd = os.open(os.ttyname(STDOUT_FILENO), os.O_RDWR)
        os.close(tmp_fd)
    else:
        os.close(slave_fd)
    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)'''
    while None:
        (rfds, wfds, xfds) = select([
            master_fd,
            STDIN_FILENO], [], [])
        if master_fd in rfds:
            data = master_read(master_fd)
            os.write(STDOUT_FILENO, data)

        if STDIN_FILENO in rfds:
            data = stdin_read(STDIN_FILENO)
            _writen(master_fd, data)
            continue
        continue
        return None


def spawn(argv, master_read = _read, stdin_read = _read):
    '''Create a spawned process.'''
    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:
        restore = 0


    try:
        _copy(master_fd, master_read, stdin_read)
    except (IOError, OSError):
        if restore:
            tty.tcsetattr(STDIN_FILENO, tty.TCSAFLUSH, mode)

    except:
        restore

    os.close(master_fd)