Python: add fix for python bug 1731717

Signed-off-by: Stephan Raue <stephan@openelec.tv>

packages/lang/Python/patches/Python-2.6.6-101-fix_subprocess.wait_bug1731717.patch

@@ -0,0 +1,96 @@
+
+# HG changeset patch
+# User Gregory P. Smith <greg@mad-scientist.com>
+# Date 1292338973 0
+# Node ID 072ee3f743c21f3770ccf13ad48e10a18048063f
+# Parent  8ccf58b0a5da776006d7fc98d9e6975c82265a78
+Merged revisions 87233 via svnmerge from
+svn+ssh://pythondev@svn.python.org/python/branches/py3k
+
+........
+  r87233 | gregory.p.smith | 2010-12-14 06:38:00 -0800 (Tue, 14 Dec 2010) | 4 lines
+
+  Issue #1731717: Fixed the problem where subprocess.wait() could cause an
+  OSError exception when The OS had been told to ignore SIGCLD in our process
+  or otherwise not wait for exiting child processes.
+........
+
+diff --git a/Lib/subprocess.py b/Lib/subprocess.py
+--- a/Lib/subprocess.py
++++ b/Lib/subprocess.py
+@@ -1194,7 +1194,11 @@ class Popen(object):
+                 os.close(errpipe_read)
+ 
+             if data != "":
+-                _eintr_retry_call(os.waitpid, self.pid, 0)
++                try:
++                    _eintr_retry_call(os.waitpid, self.pid, 0)
++                except OSError as e:
++                    if e.errno != errno.ECHILD:
++                        raise
+                 child_exception = pickle.loads(data)
+                 for fd in (p2cwrite, c2pread, errread):
+                     if fd is not None:
+@@ -1240,7 +1244,15 @@ class Popen(object):
+             """Wait for child process to terminate.  Returns returncode
+             attribute."""
+             if self.returncode is None:
+-                pid, sts = _eintr_retry_call(os.waitpid, self.pid, 0)
++                try:
++                    pid, sts = _eintr_retry_call(os.waitpid, self.pid, 0)
++                except OSError as e:
++                    if e.errno != errno.ECHILD:
++                        raise
++                    # This happens if SIGCLD is set to be ignored or waiting
++                    # for child processes has otherwise been disabled for our
++                    # process.  This child is dead, we can't get the status.
++                    sts = 0
+                 self._handle_exitstatus(sts)
+             return self.returncode
+ 
+diff --git a/Lib/test/subprocessdata/sigchild_ignore.py b/Lib/test/subprocessdata/sigchild_ignore.py
+new file mode 100644
+--- /dev/null
++++ b/Lib/test/subprocessdata/sigchild_ignore.py
+@@ -0,0 +1,6 @@
++import signal, subprocess, sys
++# On Linux this causes os.waitpid to fail with OSError as the OS has already
++# reaped our child process.  The wait() passing the OSError on to the caller
++# and causing us to exit with an error is what we are testing against.
++signal.signal(signal.SIGCLD, signal.SIG_IGN)
++subprocess.Popen([sys.executable, '-c', 'print("albatross")']).wait()
+diff --git a/Lib/test/test_subprocess.py b/Lib/test/test_subprocess.py
+--- a/Lib/test/test_subprocess.py
++++ b/Lib/test/test_subprocess.py
+@@ -778,6 +778,16 @@ class POSIXProcessTestCase(BaseTestCase)
+         self.assertStderrEqual(stderr, '')
+         self.assertEqual(p.wait(), -signal.SIGTERM)
+ 
++    def test_wait_when_sigchild_ignored(self):
++        # NOTE: sigchild_ignore.py may not be an effective test on all OSes.
++        sigchild_ignore = test_support.findfile("sigchild_ignore.py",
++                                                subdir="subprocessdata")
++        p = subprocess.Popen([sys.executable, sigchild_ignore],
++                             stdout=subprocess.PIPE, stderr=subprocess.PIPE)
++        stdout, stderr = p.communicate()
++        self.assertEqual(0, p.returncode, "sigchild_ignore.py exited"
++                         " non-zero with this error:\n%s" % stderr)
++
+ 
+ @unittest.skipUnless(mswindows, "Windows specific tests")
+ class Win32ProcessTestCase(BaseTestCase):
+diff --git a/Misc/NEWS b/Misc/NEWS
+--- a/Misc/NEWS
++++ b/Misc/NEWS
+@@ -34,6 +34,10 @@ Library
+ 
+ - Issue #10464: netrc now correctly handles lines with embedded '#' characters.
+ 
++- Issue #1731717: Fixed the problem where subprocess.wait() could cause an
++  OSError exception when The OS had been told to ignore SIGCLD in our process
++  or otherwise not wait for exiting child processes.
++
+ Extension Modules
+ -----------------
+ 
+