From 4e8a0873a7bcb346992cad6512d865f278373ce9 Mon Sep 17 00:00:00 2001
From: Alexander Kukushkin <alexander.kukushkin@zalando.de>
Date: Wed, 13 May 2015 18:05:42 +0200
Subject: [PATCH] Handle sigchld, so we can run governor and postgres inside
 docker safely

---
 governor.py | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/governor.py b/governor.py
index 39e19685..86404280 100755
--- a/governor.py
+++ b/governor.py
@@ -16,6 +16,17 @@ def sigterm_handler(signo, stack_frame):
     sys.exit()
 
 
+# handle SIGCHILD, since we are the equivalent of the INIT process
+def sigchld_handler(signo, stack_frame):
+    try:
+        while True:
+            ret = os.waitpid(-1, os.WNOHANG)
+            if ret == (0, 0):
+                break
+    except OSError:
+        pass
+
+
 class Governor:
 
     def __init__(self, config):
@@ -78,4 +89,5 @@ def main():
 if __name__ == '__main__':
     logging.basicConfig(format='%(asctime)s %(levelname)s: %(message)s', level=logging.INFO)
     signal.signal(signal.SIGTERM, sigterm_handler)
+    signal.signal(signal.SIGCHLD, sigchld_handler)
     main()