Bugs item #686667, was opened at 2003-02-14 11:47 Message generated for change (Comment added) made by david_k_hess You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=105470&aid=686667&group_id=5470
Please note that this message will contain a full copy of the comment thread, including the initial issue submission, for this request, not just the latest update. Category: Python Library Group: Python 2.3 Status: Open Resolution: None Priority: 5 Submitted By: Bernhard Herzog (bernhard) Assigned to: Nobody/Anonymous (nobody) Summary: os.spawnv(P_WAIT, ...) on Linux doesn't handle EINTR Initial Comment: The implementation of os.spawnv when called with the P_WAIT flag calls waitpid to wait for the subprocess. If this function is aborted early because of a signal, i.e. if it raises OSError with EINTR, it should be called again. I ran across this bug when trying to write a test case for a script that stops another process. Both the script and the other process are executed as subprocesses of the test program. The stop script is executed with os.spawnv(P_WAIT, ...) to wait until the script completed. Unfortunately when it stops the other process a SIGCHLD is sent to the test program which then aborts the waitpid with an exception. Tested with Python 2.1.3, 2.2 and CVS from 2003-02-13 Platform: Debian GNU/Linux, Kernel 2.4.20 ---------------------------------------------------------------------- Comment By: David Hess (david_k_hess) Date: 2006-01-29 19:30 Message: Logged In: YES user_id=896179 Also seen on Mac OS X 10.4.4 (Darwin 8.4.0) with Python 2.4.2. The Zope guys are seeing it too: http://mail.zope.org/pipermail/zope-collector-monitor/2005-December/ 006267.html It seems remarkable that this bug has been open for 3 years. spawn*() are pretty much useless without a fix. Here's patch that works for me: --- /Users/dhess/os.py 2006-01-29 19:29:25.000000000 -0600 +++ /opt/local/Library/Frameworks/Python.framework/Versions/2.4/lib/ python2.4/os.py 2006-01-29 19:29:32.000000000 -0600 @@ -532,7 +532,13 @@ if mode == P_NOWAIT: return pid # Caller is responsible for waiting! while 1: - wpid, sts = waitpid(pid, 0) + try: + wpid, sts = waitpid(pid, 0) + except OSError, exc: + import errno + if exc.errno == errno.EINTR: + continue + raise if WIFSTOPPED(sts): continue elif WIFSIGNALED(sts): ---------------------------------------------------------------------- Comment By: Mark Mc Loughlin (markmc) Date: 2005-05-09 07:07 Message: Logged In: YES user_id=116392 Seeing this on Ubuntu with Sabayon (www.gnome.org/projects/sabayon): http://bugzilla.gnome.org/show_bug.cgi?id=303034 Python version is 2.4.1 This is particularily painful because there's no way to get the PID of the process which waitpid was wating on when it was interrupted, so there's no way to reap the child ---------------------------------------------------------------------- You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=105470&aid=686667&group_id=5470 _______________________________________________ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
