bitbake: process: Handle EWOULDBLOCK in socket connect

Now that we set a timeout for the socket, it can return EWOULDBLOCK
if a signal or other event happens to wake up even if we don't timeout.

If this happens, retry the connection, else we simply see it quickly
loop through the retries and abort the connection in a very short
interval.

(Bitbake rev: c2000651a200530ba08161207ade5eea8bbeec43)

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

bitbake/lib/bb/server/process.py

@@ -479,7 +479,14 @@ def connectProcessServer(sockname, featureset):
     try:
         try:
             os.chdir(os.path.dirname(sockname))
-            sock.connect(os.path.basename(sockname))
+            finished = False
+            while not finished:
+                try:
+                    sock.connect(os.path.basename(sockname))
+                    finished = True
+                except IOError as e:
+                    if e.errno == errno.EWOULDBLOCK:
+                        pass
         finally:
             os.chdir(cwd)