mirror of
https://github.com/python/cpython.git
synced 2024-12-12 03:04:15 +08:00
98 lines
3.1 KiB
ReStructuredText
98 lines
3.1 KiB
ReStructuredText
:mod:`pty` --- Pseudo-terminal utilities
|
|
========================================
|
|
|
|
.. module:: pty
|
|
:platform: Linux
|
|
:synopsis: Pseudo-Terminal Handling for Linux.
|
|
.. moduleauthor:: Steen Lumholt
|
|
.. sectionauthor:: Moshe Zadka <moshez@zadka.site.co.il>
|
|
|
|
|
|
The :mod:`pty` module defines operations for handling the pseudo-terminal
|
|
concept: starting another process and being able to write to and read from its
|
|
controlling terminal programmatically.
|
|
|
|
Because pseudo-terminal handling is highly platform dependent, there is code to
|
|
do it only for Linux. (The Linux code is supposed to work on other platforms,
|
|
but hasn't been tested yet.)
|
|
|
|
The :mod:`pty` module defines the following functions:
|
|
|
|
|
|
.. function:: fork()
|
|
|
|
Fork. Connect the child's controlling terminal to a pseudo-terminal. Return
|
|
value is ``(pid, fd)``. Note that the child gets *pid* 0, and the *fd* is
|
|
*invalid*. The parent's return value is the *pid* of the child, and *fd* is a
|
|
file descriptor connected to the child's controlling terminal (and also to the
|
|
child's standard input and output).
|
|
|
|
|
|
.. function:: openpty()
|
|
|
|
Open a new pseudo-terminal pair, using :func:`os.openpty` if possible, or
|
|
emulation code for generic Unix systems. Return a pair of file descriptors
|
|
``(master, slave)``, for the master and the slave end, respectively.
|
|
|
|
|
|
.. function:: spawn(argv[, master_read[, stdin_read]])
|
|
|
|
Spawn a process, and connect its controlling terminal with the current
|
|
process's standard io. This is often used to baffle programs which insist on
|
|
reading from the controlling terminal.
|
|
|
|
The functions *master_read* and *stdin_read* should be functions which read from
|
|
a file descriptor. The defaults try to read 1024 bytes each time they are
|
|
called.
|
|
|
|
.. versionchanged:: 3.4
|
|
:func:`spawn` now returns the status value from :func:`os.waitpid`
|
|
on the child process.
|
|
|
|
Example
|
|
-------
|
|
|
|
.. sectionauthor:: Steen Lumholt
|
|
|
|
The following program acts like the Unix command :manpage:`script(1)`, using a
|
|
pseudo-terminal to record all input and output of a terminal session in a
|
|
"typescript". ::
|
|
|
|
import sys, os, time, getopt
|
|
import pty
|
|
|
|
mode = 'wb'
|
|
shell = 'sh'
|
|
filename = 'typescript'
|
|
if 'SHELL' in os.environ:
|
|
shell = os.environ['SHELL']
|
|
|
|
try:
|
|
opts, args = getopt.getopt(sys.argv[1:], 'ap')
|
|
except getopt.error as msg:
|
|
print('%s: %s' % (sys.argv[0], msg))
|
|
sys.exit(2)
|
|
|
|
for opt, arg in opts:
|
|
# option -a: append to typescript file
|
|
if opt == '-a':
|
|
mode = 'ab'
|
|
# option -p: use a Python shell as the terminal command
|
|
elif opt == '-p':
|
|
shell = sys.executable
|
|
if args:
|
|
filename = args[0]
|
|
|
|
script = open(filename, mode)
|
|
|
|
def read(fd):
|
|
data = os.read(fd, 1024)
|
|
script.write(data)
|
|
return data
|
|
|
|
sys.stdout.write('Script started, file is %s\n' % filename)
|
|
script.write(('Script started on %s\n' % time.asctime()).encode())
|
|
pty.spawn(shell, read)
|
|
script.write(('Script done on %s\n' % time.asctime()).encode())
|
|
sys.stdout.write('Script done, file is %s\n' % filename)
|