Use os.devnull

sshuttle/client.py

@@ -16,7 +16,7 @@
     resolvconf_nameservers
 from sshuttle.methods import get_method, Features
 
-_extra_fd = os.open('/dev/null', os.O_RDONLY)
+_extra_fd = os.open(os.devnull, os.O_RDONLY)
 
 
 def got_signal(signum, frame):
@@ -76,7 +76,7 @@ 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()
@@ -323,7 +323,7 @@ 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 @@
 hostnames = {}
 queue = {}
 try:
-    null = open('/dev/null', 'wb')
+    null = open(os.devnull, 'wb')
 except IOError as e:
     log('warning: %s\n' % e)
     null = os.popen("sh -c 'while read x; do :; done'", 'wb', 4096)

sshuttle/ssh.py

@@ -108,7 +108,7 @@ def connect(ssh_cmd, rhostport, python, stderr, options):
         if python:
             pycmd = "'%s' -c '%s'" % (python, pyscript)
         else:
-            pycmd = ("P=python3.5; $P -V 2>/dev/null || P=python; "
+            pycmd = ("P=python3.5; $P -V 2>" + os.devnull + " || P=python; "
                      "exec \"$P\" -c '%s'") % pyscript
         argv = (sshl +
                 portl +