EventLoop: handle Linux 2.4 errno 38 for epoll

diff --git a/pym/portage/util/_eventloop/EventLoop.py b/pym/portage/util/_eventloop/EventLoop.py
index 15d4ef214ee4eae6a7eb7ba1ed135b219d334eda..17a468f28852d9771293b6f1b6a7b35c42160f9c 100644 (file)
--- a/pym/portage/util/_eventloop/EventLoop.py
+++ b/pym/portage/util/_eventloop/EventLoop.py
@@ -53,9 +53,28 @@ class EventLoop(object):
                self._timeout_handlers = {}
                self._timeout_interval = None
 
+               self._poll_obj = None
                try:
                        select.epoll
                except AttributeError:
+                       pass
+               else:
+                       try:
+                               epoll_obj = select.epoll()
+                       except IOError:
+                               # This happens with Linux 2.4 kernels:
+                               # IOError: [Errno 38] Function not implemented
+                               pass
+                       else:
+                               self._poll_obj = _epoll_adapter(epoll_obj)
+                               self.IO_ERR = select.EPOLLERR
+                               self.IO_HUP = select.EPOLLHUP
+                               self.IO_IN = select.EPOLLIN
+                               self.IO_NVAL = 0
+                               self.IO_OUT = select.EPOLLOUT
+                               self.IO_PRI = select.EPOLLPRI
+
+               if self._poll_obj is None:
                        self._poll_obj = create_poll_instance()
                        self.IO_ERR = PollConstants.POLLERR
                        self.IO_HUP = PollConstants.POLLHUP
@@ -63,14 +82,6 @@ class EventLoop(object):
                        self.IO_NVAL = PollConstants.POLLNVAL
                        self.IO_OUT = PollConstants.POLLOUT
                        self.IO_PRI = PollConstants.POLLPRI
-               else:
-                       self._poll_obj = _epoll_adapter(select.epoll())
-                       self.IO_ERR = select.EPOLLERR
-                       self.IO_HUP = select.EPOLLHUP
-                       self.IO_IN = select.EPOLLIN
-                       self.IO_NVAL = 0
-                       self.IO_OUT = select.EPOLLOUT
-                       self.IO_PRI = select.EPOLLPRI
 
                self._child_handlers = {}
                self._sigchld_read = None