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# Run an xterm on current process or a forked process
# Adapted from pty.py in Python 1.5.2 distribution. # The pty.fork() couldnt be used because it didn't return # the pty name needed by xterm # I couldnt import pty.py to use master_open because it didn't find termios.
import os import sys import fcntl
# We couldnt find termios
STDIN_FILENO, STDOUT_FILENO, STDERR_FILENO = 0, 1, 2
# Open pty master. Returns (master_fd, tty_name). SGI and Linux/BSD version. # Copied from pty.py from Python 1.5.2. /SN
def master_open(): try: import sgi except ImportError: pass else: try: tty_name, master_fd = sgi._getpty(fcntl.O_RDWR, 0o666, 0) except IOError as msg: 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, fcntl.O_RDWR) except os.error: continue return (fd, '/dev/tty' + x + y) raise os.error('out of pty devices')
# Open the pty slave. Acquire the controlling terminal. # Returns file descriptor. Linux version. (Should be universal? --Guido) # Copied from pty.py from Python 1.5.2. /SN
def slave_open(tty_name): return os.open(tty_name, fcntl.O_RDWR)
def xterm(prog=None, options=''): master_fd, tty_name = master_open() pid = os.fork() if pid: # Acquire controlling terminal. slave_fd = slave_open(tty_name)
# 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) os.close(master_fd) sys.stdin.readline() # Throw away an init string from xterm if prog is not None: prog() else: os.setsid() cmd = 'xterm %s -S%s%d' % (options, tty_name[-2:], master_fd) os.system(cmd) #os.waitpid(pid, 0) return pid
def forkxterm(prog=None, options=''): pid = os.fork() if pid: return pid else: os.setsid() pid = xterm(prog, options) if not pid: os._exit(0)
def hello(): print('hello') while 1: pass
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