replace path /dev/null by os.devnull

sshuttle/client.py

@@ -33,7 +33,7 @@ except AttributeError:
     except ImportError:
         import socket
 
-_extra_fd = os.open('/dev/null', os.O_RDONLY)
+_extra_fd = os.open(os.devnull, os.O_RDONLY)
 
 
 def got_signal(signum, frame):
@@ -93,7 +93,7 @@ def daemonize():
     # be deleted.
     signal.signal(signal.SIGTERM, got_signal)
 
-    si = open('/dev/null', 'r+')
+    si = open(os.devnull, 'r+')
     os.dup2(si.fileno(), 0)
     os.dup2(si.fileno(), 1)
     si.close()
@@ -355,7 +355,7 @@ def onaccept_tcp(listener, method, mux, handlers):
                 sock, srcip = listener.accept()
                 sock.close()
             finally:
-                _extra_fd = os.open('/dev/null', os.O_RDONLY)
+                _extra_fd = os.open(os.devnull, os.O_RDONLY)
             return
         else:
             raise

sshuttle/hostwatch.py

@@ -21,7 +21,7 @@ _smb_ok = True
 hostnames = {}
 queue = {}
 try:
-    null = open('/dev/null', 'wb')
+    null = open(os.devnull, 'wb')
 except IOError:
     _, e = sys.exc_info()[:2]
     log('warning: %s\n' % e)

sshuttle/methods/ipfw.py

@@ -105,7 +105,7 @@ def _fill_oldctls(prefix):
 def _sysctl_set(name, val):
     argv = ['sysctl', '-w', '%s=%s' % (name, val)]
     debug1('>> %s\n' % ' '.join(argv))
-    return ssubprocess.call(argv, stdout=open('/dev/null', 'w'))
+    return ssubprocess.call(argv, stdout=open(os.devnull, 'w'))
 
 
 _changedctls = []

sshuttle/ssh.py

@@ -116,8 +116,8 @@ def connect(ssh_cmd, rhostport, python, stderr, options):
         if python:
             pycmd = "'%s' -c '%s'" % (python, pyscript)
         else:
-            pycmd = ("P=python3; $P -V 2>/dev/null || P=python; "
+            pycmd = ("P=python3; $P -V 2>%s || P=python; "
-                     "exec \"$P\" -c %s") % quote(pyscript)
+                     "exec \"$P\" -c %s") % (os.devnull, quote(pyscript))
             pycmd = ("exec /bin/sh -c %s" % quote(pycmd))
         argv = (sshl +
                 portl +