Basic daemon code.

bouncer.py

@@ -0,0 +1,53 @@
+#!/usr/bin/env python2
+
+import os
+import time
+import sys
+import subprocess
+
+
+def doublefork(pidfile, logfile):
+    """Create a daemon process by double-forking, detaching standard streams and creating a pidfile."""
+    def panic(message):
+        f = open(logfile, "aw")
+        f.write("panic: %s\n" % message)
+        f.close()
+
+    try:
+        pid = os.fork()
+    except OSError as e:
+        panic("%s [%d]" % (e.strerror, e.errno))
+        return False
+
+    if pid == 0:
+        # we are the first child
+        os.setsid()
+        try:
+            pid = os.fork()
+        except OSError as e:
+            panic("%s [%d]" % (e.strerror, e.errno))
+            return False
+
+        if pid == 0:
+            # we are the second child
+            os.chdir("/")
+            os.umask(0)
+        else:
+            os._exit(0)
+
+    else:
+        os._exit(0)
+
+    pid = open(pidfile, "w")
+    pid.write("%i" % os.getpid())
+    pid.close()
+
+    stdout = os.open(logfile, os.O_CREAT | os.O_WRONLY | os.O_APPEND)
+    os.dup2(stdout, sys.stdout.fileno())
+    os.dup2(stdout, sys.stderr.fileno())
+    return True
+
+doublefork("/tmp/pid", "/tmp/log")
+while True:
+    time.sleep(2)
+    print "cocks"