[PyQt] [Errno 4] Interrupted system call

[Arve Knudsen]

Hi Jeremy

On 5/28/07, Jeremy Moskovich <jeremy.moskovich at mobileye.com> 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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