Display ipc path in case of ENOENT exception

zmq/backend/cffi/socket.py

@@ -136,6 +136,14 @@ def bind(self, address):
                                 'characters (sizeof(sockaddr_un.sun_path)).'
                                 .format(path, IPC_PATH_MAX_LEN))
                 raise ZMQError(C.zmq_errno(), msg=msg)
+            elif C.zmq_errno() == errno_mod.ENOENT:
+                # py3compat: address is bytes, but msg wants str
+                if str is unicode:
+                    address = address.decode('utf-8', 'replace')
+                path = address.split('://', 1)[-1]
+                msg = ('No such file or directory for ipc path "{0}".'.format(
+                       path))
+                raise ZMQError(C.zmq_errno(), msg=msg)
             else:
                 _check_rc(rc)
 

zmq/backend/cython/socket.pyx

@@ -27,7 +27,7 @@
 cdef extern from "pyversion_compat.h":
     pass
 
-from libc.errno cimport ENAMETOOLONG, ENOTSOCK
+from libc.errno cimport ENAMETOOLONG, ENOENT, ENOTSOCK
 from libc.string cimport memcpy
 
 from cpython cimport PyBytes_FromStringAndSize
@@ -542,6 +542,14 @@ cdef class Socket:
                                 'to check addr length (if it is defined).'
                                 .format(path, IPC_PATH_MAX_LEN))
                 raise ZMQError(msg=msg)
+            elif zmq_errno() == ENOENT:
+                # py3compat: address is bytes, but msg wants str
+                if str is unicode:
+                    addr = addr.decode('utf-8', 'replace')
+                path = addr.split('://', 1)[-1]
+                msg = ('No such file or directory for ipc path "{0}".'.format(
+                       path))
+                raise ZMQError(msg=msg)
         while True:
             try:
                 _check_rc(rc)

zmq/tests/test_socket.py

@@ -3,6 +3,7 @@
 # Distributed under the terms of the Modified BSD License.
 
 import copy
+import errno
 import json
 import os
 import platform
@@ -11,6 +12,7 @@
 import socket
 import sys
 
+import pytest
 from pytest import mark
 
 import zmq
@@ -396,7 +398,20 @@ def test_ipc_path_max_length_msg(self):
             s.bind('ipc://{0}'.format('a' * (zmq.IPC_PATH_MAX_LEN + 1)))
         except zmq.ZMQError as e:
             self.assertTrue(str(zmq.IPC_PATH_MAX_LEN) in e.strerror)
-
+
+    @mark.skipif(windows, reason="ipc not supported on Windows.")
+    def test_ipc_path_no_such_file_or_directory_message(self):
+        """Display the ipc path in case of an ENOENT exception"""
+        s = self.context.socket(zmq.PUB)
+        self.sockets.append(s)
+        invalid_path = '/foo/bar'
+        with pytest.raises(zmq.ZMQError) as error:
+            s.bind('ipc://{0}'.format(invalid_path))
+        assert error.value.errno == errno.ENOENT
+        error_message = str(error.value)
+        assert invalid_path in error_message
+        assert "no such file or directory" in error_message.lower()
+
     def test_hwm(self):
         zmq3 = zmq.zmq_version_info()[0] >= 3
         for stype in (zmq.PUB, zmq.ROUTER, zmq.SUB, zmq.REQ, zmq.DEALER):