pexpect.spawn() allows cmd argument to be None to support subclasses

that don't use cmd or args.
Moved irix hack string check out of a loop. irix hack flag now
gets set in __init__.
Added fdpexpect.py to support users already open filedexcriptors.
Pexpect used to allow this, but it was messy. I'm trying to add it
back in by request.
Added an ad-hoc fd_test.py which is just a temporary test and should
be deleted some day.

1 files changed, 51 insertions, 0 deletions

diff --git a/pexpect/fdpexpect.py b/pexpect/fdpexpect.py
new file mode 100644
index 0000000..6dbaa26
--- /dev/null
+++ b/pexpect/fdpexpect.py
@@ -0,0 +1,51 @@
+"""This is like pexpect.spawn but allows you to supply your own,
+already 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.
+
+"""
+import pexpect
+
+class fdspawn (pexpect.spawn):
+    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(''):
+            return
+
+        if type(fd)!=type(1) and hasattr(fd, 'fileno'):
+            fd = fd.fileno()
+        pexpect.spawn.__init__(self, None, args, timeout, maxread, searchwindowsize, logfile)
+        self.child_fd = fd
+        self.own_fd = False
+        self.closed = False
+
+    def __del__ (self):
+        return
+
+    def close (self):
+        if super(fdspawn, self).child_fd == -1:
+            return
+        if self.own_fd:
+            super(fdspawn, self).close (self)
+        else:
+            self.flush()
+            os.close(super(fdspawn, self).child_fd)
+            self.child_fd = -1
+            self.closed = True
+
+    def isalive (self):
+        print "isalive()"
+        return True
+
+    def terminate (self, force=False):
+        print "terminate()"
+        return
+
+    def kill (self, sig):
+        print "kill()"
+        return
+