update documentation on _test_openpty_eof and disable openpty on Solaris again (branc...

svn path=/main/trunk/; revision=14722

diff --git a/pym/portage/__init__.py b/pym/portage/__init__.py
index ab777010be1b3275c5b86aaf15ff7ba4e5773686..10b969c198e4444b42228c774422f38b374b7a1e 100644 (file)
--- a/pym/portage/__init__.py
+++ b/pym/portage/__init__.py
@@ -3793,6 +3793,11 @@ def _can_test_pty_eof():
        """
        The _test_pty_eof() function seems to hang on most
        kernels other than Linux.
+       This was reported for the following kernels which used to work fine
+       without this EOF test: Darwin, AIX, FreeBSD.  They seem to hang on
+       the slave_file.close() call.  Note that Python's implementation of
+       openpty on Solaris already caused random hangs without this EOF test
+       and hence is globally disabled.
        @rtype: bool
        @returns: True if _test_pty_eof() won't hang, False otherwise.
        """
@@ -3889,20 +3894,14 @@ def _test_pty_eof():
 # this issue is fixed in python3, we can add another sys.hexversion
 # conditional to enable openpty support in the fixed versions.
 if sys.hexversion >= 0x3000000 and not _can_test_pty_eof():
+       _disable_openpty = True
+else:
        # Disable the use of openpty on Solaris as it seems Python's openpty
        # implementation doesn't play nice on Solaris with Portage's
        # behaviour causing hangs/deadlocks.
-       # Disable on Darwin also, it used to work fine, but since the
-       # introduction of _test_pty_eof Portage hangs (on the
-       # slave_file.close()) indicating some other problems with openpty on
-       # Darwin there
-       # On AIX, haubi reported that the openpty code doesn't work any
-       # longer since the introduction of _test_pty_eof either.
-       # Looks like Python's openpty module is too fragile to use on UNIX,
-       # so only use it on Linux
-       _disable_openpty = True
-else:
-       _disable_openpty = False
+       # Additional note for the future: on Interix, pipes do NOT work, so
+       # _disable_openpty on Interix must *never* be True
+       _disable_openpty = platform.system() in ("SunOS",)
 _tested_pty = False
 
 if not _can_test_pty_eof():