Hi Jeremy On 5/28/07, Jeremy Moskovich <[EMAIL PROTECTED]> wrote:
Hi, I'm having consistent problems using the python subprocess module in PyQT applications. os.read() & os.wait() calls seem to be interrupted intermittently, in a manner similar to the following stack trace: File "/homes/jeremym/programs/python2.5/lib/python2.5/subprocess.py", line 593, in __init__ errread, errwrite) File "/homes/jeremym/programs/python2.5/lib/python2.5/subprocess.py", line 1046, in _execute_child data = os.read(errpipe_read, 1048576) # Exceptions limited to 1 MB OSError: [Errno 4] Interrupted system call The only mention I could find about this online is at: http://mail.python.org/pipermail/python-list/2007-February/427031.html which just recommends retrying the operation.
I've never experienced an interruption during the construction of a Popen object, which seems to be the case here. Calls to Popen.wait, on the other hand, did get interrupted all the time on OS X (no idea why), so I had to catch EINTR and retry. Are you using the very latest Python though? I have version 2.5.1 on Ubuntu, and from browsing subprocess.py I see that os.read is now wrapped, so that the operation is always retried upon EINTR. Hope this helps, Arve
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