Issue #11185: Fix test_wait4 under AIX. Patch by Sébastien Sablé.

2 files changed, 9 insertions, 2 deletions

diff --git a/Lib/test/test_wait4.py b/Lib/test/test_wait4.py
index cdcd060..352c11a 100644
--- a/Lib/test/test_wait4.py
+++ b/Lib/test/test_wait4.py
@@ -3,6 +3,7 @@
 
 import os
 import time
+import sys
 from test.fork_wait import ForkWait
 from test.support import run_unittest, reap_children, get_attribute
 
@@ -13,10 +14,15 @@ get_attribute(os, 'wait4')
 
 class Wait4Test(ForkWait):
     def wait_impl(self, cpid):
+        option = os.WNOHANG
+        if sys.platform.startswith('aix'):
+            # Issue #11185: wait4 is broken on AIX and will always return 0
+            # with WNOHANG.
+            option = 0
         for i in range(10):
             # wait4() shouldn't hang, but some of the buildbots seem to hang
             # in the forking tests.  This is an attempt to fix the problem.
-            spid, status, rusage = os.wait4(cpid, os.WNOHANG)
+            spid, status, rusage = os.wait4(cpid, option)
             if spid == cpid:
                 break
             time.sleep(1.0)
diff --git a/Misc/NEWS b/Misc/NEWS
index 822afb3..0067bc7 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -465,10 +465,11 @@ Library
 
 - Implement PEP 435 "Adding an Enum type to the Python standard library".
 
-
 Tests
 -----
 
+- Issue #11185: Fix test_wait4 under AIX.  Patch by Sébastien Sablé.
+
 - Issue #18207: Fix test_ssl for some versions of OpenSSL that ignore seconds
   in ASN1_TIME fields.