Main process fixes

- handles old dialog versions better if using curses
- can spawn SMTP delivery thread if configured (only when in daemon
  mode)
- daemonized mode now works more like it's properly supposed to on unix
  (double fork etc). You may have to adjust your init scripts, when
  when using upstart for example you should now use "expect daemon"
- daemon mode now cleanly shuts down when TERM/INT signal is received

src/bitmessagemain.py

@@ -38,6 +38,7 @@ from class_outgoingSynSender import outgoingSynSender
 from class_singleListener import singleListener
 from class_singleWorker import singleWorker
 from class_addressGenerator import addressGenerator
+from class_smtpDeliver import smtpDeliver
 from debug import logger
 
 # Helper Functions
@@ -153,16 +154,21 @@ class Main:
         _fixWinsock()
 
         shared.daemon = daemon
+
+        # get curses flag
+        shared.curses = False
+        if '-c' in sys.argv:
+            shared.curses = True
+
         # is the application already running?  If yes then exit.
         shared.thisapp = singleton.singleinstance("", daemon)
 
-        # get curses flag
-        curses = False
-        if '-c' in sys.argv:
-            curses = True
+        if daemon:
+            with shared.printLock:
+                print('Running as a daemon. Send TERM signal to end.')
+            self.daemonize()
 
-        signal.signal(signal.SIGINT, helper_generic.signal_handler)
-        # signal.signal(signal.SIGINT, signal.SIG_DFL)
+        self.setSignalHandler()
 
         helper_bootstrap.knownNodes()
         # Start the address generation thread
@@ -180,6 +186,11 @@ class Main:
         sqlLookup.daemon = False  # DON'T close the main program even if there are threads left. The closeEvent should command this thread to exit gracefully.
         sqlLookup.start()
 
+        # SMTP delivery thread
+        if daemon and shared.config.get("bitmessagesettings", "smtpdeliver", None):
+            smtpDeliveryThread = smtpDeliver()
+            smtpDeliveryThread.start()
+
         # Start the thread that calculates POWs
         objectProcessorThread = objectProcessor()
         objectProcessorThread.daemon = False  # DON'T close the main program even the thread remains. This thread checks the shutdown variable after processing each object.
@@ -221,7 +232,7 @@ class Main:
             upnpThread.start()
 
         if daemon == False and shared.safeConfigGetBoolean('bitmessagesettings', 'daemon') == False:
-            if curses == False:
+            if shared.curses == False:
                 if not depends.check_pyqt():
                     print('PyBitmessage requires PyQt unless you want to run it as a daemon and interact with it using the API. You can download PyQt from http://www.riverbankcomputing.com/software/pyqt/download   or by searching Google for \'PyQt Download\'. If you want to run in daemon mode, see https://bitmessage.org/wiki/Daemon')
                     print('You can also run PyBitmessage with the new curses interface by providing \'-c\' as a commandline argument.')
@@ -230,22 +241,38 @@ class Main:
                 import bitmessageqt
                 bitmessageqt.run()
             else:
-                if depends.check_curses():
+                if True:
+#                if depends.check_curses():
                     print('Running with curses')
                     import bitmessagecurses
                     bitmessagecurses.runwrapper()
         else:
             shared.config.remove_option('bitmessagesettings', 'dontconnect')
 
-            if daemon:
-                with shared.printLock:
-                    print('Running as a daemon. The main program should exit this thread.')
-            else:
-                with shared.printLock:
-                    print('Running as a daemon. You can use Ctrl+C to exit.')
             while True:
                 time.sleep(20)
 
+    def daemonize(self):
+        if os.fork():
+            exit(0)
+        os.umask(0)
+        os.setsid()
+        if os.fork():
+            exit(0)
+        sys.stdout.flush()
+        sys.stderr.flush()
+        si = file('/dev/null', 'r')
+        so = file('/dev/null', 'a+')
+        se = file('/dev/null', 'a+', 0)
+        os.dup2(si.fileno(), sys.stdin.fileno())
+        os.dup2(so.fileno(), sys.stdout.fileno())
+        os.dup2(se.fileno(), sys.stderr.fileno())
+
+    def setSignalHandler(self):
+        signal.signal(signal.SIGINT, helper_generic.signal_handler)
+        signal.signal(signal.SIGTERM, helper_generic.signal_handler)
+        # signal.signal(signal.SIGINT, signal.SIG_DFL)
+
     def stop(self):
         with shared.printLock:
             print('Stopping Bitmessage Deamon.')

src/helper_generic.py

@@ -2,6 +2,7 @@ import socket
 import sys
 from binascii import hexlify, unhexlify
 
+from debug import logger
 import shared
 
 def convertIntToString(n):
@@ -17,11 +18,10 @@ def convertIntToString(n):
 def convertStringToInt(s):
     return int(hexlify(s), 16)
 
-
 def signal_handler(signal, frame):
+    logger.error("Got signal %i", signal)
     if shared.safeConfigGetBoolean('bitmessagesettings', 'daemon'):
         shared.doCleanShutdown()
-        sys.exit(0)
     else:
         print 'Unfortunately you cannot use Ctrl+C when running the UI because the UI captures the signal.'
 

src/singleton.py

@@ -21,10 +21,11 @@ class singleinstance:
     """
     def __init__(self, flavor_id="", daemon=False):
         self.initialized = False
+        self.counter = 0
         self.daemon = daemon
         self.lockfile = os.path.normpath(os.path.join(shared.appdata, 'singleton%s.lock' % flavor_id))
 
-        if not self.daemon:
+        if not self.daemon and not shared.curses:
             # Tells the already running (if any) application to get focus.
             import bitmessageqt
             bitmessageqt.init()
@@ -55,6 +56,10 @@ class singleinstance:
     def cleanup(self):
         if not self.initialized:
             return
+        self.counter += 1
+        if self.daemon and self.counter < 3:
+            # these are the two initial forks while daemonizing
+            return
         print "Cleaning up lockfile"
         try:
             if sys.platform == 'win32':