# 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
|