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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):