http://llvm.org/bugs/show_bug.cgi?id=18749
Bug ID: 18749
Summary: built-in pexpect.py produces ioctl sign-extension
warnings on FreeBSD
Product: lldb
Version: unspecified
Hardware: PC
OS: FreeBSD
Status: NEW
Severity: normal
Priority: P
Component: All Bugs
Assignee: [email protected]
Reporter: [email protected]
Classification: Unclassified
LLDB includes a copy of pexpect, in test/pexpect-2.4/pexpect.py
It includes a hack to work around some buggy platforms:
# Check for buggy platforms. Some Python versions on some platforms
# (notably OSF1 Alpha and RedHat 7.1) truncate the value for
# termios.TIOCSWINSZ. It is not clear why this happens.
# These platforms don't seem to handle the signed int very well;
# yet other platforms like OpenBSD have a large negative value for
# TIOCSWINSZ and they don't have a truncate problem.
# Newer versions of Linux have totally different values for TIOCSWINSZ.
# Note that this fix is a hack.
TIOCSWINSZ = getattr(termios, 'TIOCSWINSZ', -2146929561)
if TIOCSWINSZ == 2148037735L: # L is not required in Python >= 2.2.
TIOCSWINSZ = -2146929561 # Same bits, but with sign.
-2146929561 == 0xffffffff80087467. Passing this sign-extended value, instead
of the desired 0x80087467, produces a warning message in the system console on
FreeBSD:
Feb 5 17:19:11 feynman kernel: WARNING pid 11323 (python2.7): ioctl
sign-extension ioctl ffffffff80087467
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