bitbake: knotty: fix TIOCGWINSZ call for Python 3.14 and later

Python 3.14 enforces stricter type and size checking for fcntl.ioctl()
buffer arguments. The previous code passed a short 4-byte string ('1234')
to TIOCGWINSZ, which worked by accident in older Python versions but causes
a SystemError ("buffer overflow") in 3.14.

TIOCGWINSZ expects an 8-byte (4x 16-bit) buffer corresponding to
(rows, cols, xpix, ypix). Use an 8-byte bytes literal instead and unpack
the first two values.

Tested with Python 3.11, 3.13, and 3.14.

(Bitbake rev: 9127359eb116827a1e0debe69f84e57717436847)

Signed-off-by: Enrico Scholz <enrico.scholz@sigma-chemnitz.de>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
(cherry picked from commit 415e9e329cf8cc0c2caa01cba80c21cfac9e2414)
Signed-off-by: Yoann Congal <yoann.congal@smile.fr>
Signed-off-by: Paul Barker <paul@pbarker.dev>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

1 files changed, 1 insertions, 1 deletions

diff --git a/bitbake/lib/bb/ui/knotty.py b/bitbake/lib/bb/ui/knotty.py
index 3784c93ad8..41a943adf8 100644
--- a/bitbake/lib/bb/ui/knotty.py
+++ b/bitbake/lib/bb/ui/knotty.py
@@ -131,7 +131,7 @@ class TerminalFilter(object):
     def getTerminalColumns(self):
         def ioctl_GWINSZ(fd):
             try:
-                cr = struct.unpack('hh', fcntl.ioctl(fd, self.termios.TIOCGWINSZ, '1234'))
+                cr = struct.unpack('hhhh', fcntl.ioctl(fd, self.termios.TIOCGWINSZ, b'12345678'))[0:2]
             except:
                 return None
             return cr