(Spawn._read): Override the default method to handle EIO properly.

(Spawn.kill): New method.

pcl_expect/spawn.py

@@ -67,6 +67,7 @@
 import os
 import sys
 import pty
+import errno
 import fcntl
 
 import pcl_expect
@@ -226,6 +227,20 @@ class Spawn(pcl_expect.Expectable):
         pcl_expect.debug("sending \"%s\" to fd %d" % (s, self.fileno()))
         os.write(self.fileno(), s)
 
+    def _read(self):
+        # When reading from a pty, at least under Linux, you get EIO
+        # when the process dies.  Treat this as a normal end-of-file.
+        try:
+            return pcl_expect.Expectable._read(self)
+        except OSError, err:
+            if err.errno == errno.EIO:
+                return "", True
+            raise
+
+    def kill(self, sig):
+        """Send signal SIG to the child process."""
+        os.kill(self.__child_pid, sig)
+
     def close(self):
         """Close the pty and wait for the child to die.