add debugging signal

mtprotoproxy.py

@@ -12,6 +12,7 @@ import binascii
 import sys
 import re
 import runpy
+import signal
 
 try:
     import uvloop
@@ -65,6 +66,13 @@ except (ValueError, OSError):
 except ImportError:
     pass
 
+
+def debug_signal(signum, frame):
+    import pdb
+    pdb.set_trace()
+
+signal.signal(signal.SIGUSR1, debug_signal)
+
 if len(sys.argv) > 1:
     config = runpy.run_path(sys.argv[1])
 else: