--- /dev/null
+"""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 type(fd) != type(0) and hasattr(fd, 'fileno'):
+ fd = fd.fileno()
+
+ if type(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
+