forked from OSchip/llvm-project
99 lines
2.7 KiB
Python
99 lines
2.7 KiB
Python
"""This is like pexpect, but will work on any file descriptor that you pass it.
|
|
So you are reponsible for opening and close the file descriptor.
|
|
|
|
$Id: fdpexpect.py 505 2007-12-26 21:33:50Z noah $
|
|
"""
|
|
|
|
from pexpect import *
|
|
import os
|
|
|
|
__all__ = ['fdspawn']
|
|
|
|
|
|
class fdspawn (spawn):
|
|
|
|
"""This is like pexpect.spawn but allows you to supply your own open file
|
|
descriptor. For example, you could use it to read through a file looking
|
|
for patterns, or to control a modem or serial device. """
|
|
|
|
def __init__(
|
|
self,
|
|
fd,
|
|
args=[],
|
|
timeout=30,
|
|
maxread=2000,
|
|
searchwindowsize=None,
|
|
logfile=None):
|
|
"""This takes a file descriptor (an int) or an object that support the
|
|
fileno() method (returning an int). All Python file-like objects
|
|
support fileno(). """
|
|
|
|
# TODO: Add better handling of trying to use fdspawn in place of spawn
|
|
# TODO: (overload to allow fdspawn to also handle commands as spawn
|
|
# does.
|
|
|
|
if not isinstance(fd, type(0)) and hasattr(fd, 'fileno'):
|
|
fd = fd.fileno()
|
|
|
|
if not isinstance(fd, type(0)):
|
|
raise ExceptionPexpect(
|
|
'The fd argument is not an int. If this is a command string then maybe you want to use pexpect.spawn.')
|
|
|
|
try: # make sure fd is a valid file descriptor
|
|
os.fstat(fd)
|
|
except OSError:
|
|
raise ExceptionPexpect(
|
|
'The fd argument is not a valid file descriptor.')
|
|
|
|
self.args = None
|
|
self.command = None
|
|
spawn.__init__(
|
|
self,
|
|
None,
|
|
args,
|
|
timeout,
|
|
maxread,
|
|
searchwindowsize,
|
|
logfile)
|
|
self.child_fd = fd
|
|
self.own_fd = False
|
|
self.closed = False
|
|
self.name = '<file descriptor %d>' % fd
|
|
|
|
def __del__(self):
|
|
|
|
return
|
|
|
|
def close(self):
|
|
|
|
if self.child_fd == -1:
|
|
return
|
|
if self.own_fd:
|
|
self.close(self)
|
|
else:
|
|
self.flush()
|
|
os.close(self.child_fd)
|
|
self.child_fd = -1
|
|
self.closed = True
|
|
|
|
def isalive(self):
|
|
"""This checks if the file descriptor is still valid. If os.fstat()
|
|
does not raise an exception then we assume it is alive. """
|
|
|
|
if self.child_fd == -1:
|
|
return False
|
|
try:
|
|
os.fstat(self.child_fd)
|
|
return True
|
|
except:
|
|
return False
|
|
|
|
def terminate(self, force=False):
|
|
|
|
raise ExceptionPexpect(
|
|
'This method is not valid for file descriptors.')
|
|
|
|
def kill(self, sig):
|
|
|
|
return
|