bitbake: bitbake-worker: exit normally when SIGHUP

Fixed:
1) Run "bitbake recipe" in the terminal
2) Close the terminal while building
3) $ ps aux | grep bitbake-worker
There will be many processes, and they will keep the resources (e.g.,
memory), and won't exit unless kill or kill -9.

(Bitbake rev: 40d2ae0723de2bf5fee343faafb4afda40546839)

Signed-off-by: Robert Yang <liezhi.yang@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

bitbake/bin/bitbake-worker

@@ -147,6 +147,8 @@ def fork_off_task(cfg, data, workerdata, fn, task, taskname, appends, taskdepdat
             pipein.close()
 
             signal.signal(signal.SIGTERM, sigterm_handler)
+            # Let SIGHUP exit as SIGTERM
+            signal.signal(signal.SIGHUP, sigterm_handler)
 
             # Save out the PID so that the event can include it the
             # events
@@ -266,9 +268,14 @@ class BitbakeWorker(object):
         self.build_pipes = {}
     
         signal.signal(signal.SIGTERM, self.sigterm_exception)
+        # Let SIGHUP exit as SIGTERM
+        signal.signal(signal.SIGHUP, self.sigterm_exception)
 
     def sigterm_exception(self, signum, stackframe):
-        bb.warn("Worker recieved SIGTERM, shutting down...")
+        if signum == signal.SIGTERM:
+            bb.warn("Worker recieved SIGTERM, shutting down...")
+        elif signum == signal.SIGHUP:
+            bb.warn("Worker recieved SIGHUP, shutting down...")
         self.handle_finishnow(None)
         signal.signal(signal.SIGTERM, signal.SIG_DFL)
         os.kill(os.getpid(), signal.SIGTERM)

bitbake/lib/bb/cooker.py

@@ -153,9 +153,14 @@ class BBCooker:
         self.parser = None
 
         signal.signal(signal.SIGTERM, self.sigterm_exception)
+        # Let SIGHUP exit as SIGTERM
+        signal.signal(signal.SIGHUP, self.sigterm_exception)
 
     def sigterm_exception(self, signum, stackframe):
-        bb.warn("Cooker recieved SIGTERM, shutting down...")
+        if signum == signal.SIGTERM:
+            bb.warn("Cooker recieved SIGTERM, shutting down...")
+        elif signum == signal.SIGHUP:
+            bb.warn("Cooker recieved SIGHUP, shutting down...")
         self.state = state.forceshutdown
 
     def setFeatures(self, features):