diff --git a/netfilterqueue.c b/netfilterqueue.c
index a274485..63fa8b0 100644
--- a/netfilterqueue.c
+++ b/netfilterqueue.c
@@ -554,7 +554,7 @@ enum  {
   __pyx_e_14netfilterqueue_PF_INET6 = 10
 };
 
-/* "netfilterqueue.pxd":157
+/* "netfilterqueue.pxd":158
  * 
  * # Dummy defines from linux/netfilter.h
  * cdef enum:             # <<<<<<<<<<<<<<
@@ -563,7 +563,7 @@ enum  {
  */
 enum  {
 
-  /* "netfilterqueue.pxd":164
+  /* "netfilterqueue.pxd":165
  *     NF_REPEAT
  *     NF_STOP
  *     NF_MAX_VERDICT = NF_STOP             # <<<<<<<<<<<<<<
@@ -579,7 +579,7 @@ enum  {
   __pyx_e_14netfilterqueue_NF_MAX_VERDICT = __pyx_e_14netfilterqueue_NF_STOP
 };
 
-/* "netfilterqueue.pxd":166
+/* "netfilterqueue.pxd":167
  *     NF_MAX_VERDICT = NF_STOP
  * 
  * cdef class Packet:             # <<<<<<<<<<<<<<
@@ -606,7 +606,7 @@ struct __pyx_obj_14netfilterqueue_Packet {
 };
 
 
-/* "netfilterqueue.pxd":205
+/* "netfilterqueue.pxd":206
  *     cpdef repeat(self)
  * 
  * cdef class NetfilterQueue:             # <<<<<<<<<<<<<<
@@ -997,6 +997,7 @@ static const char __pyx_k_ENCAP[] = "ENCAP";
 static const char __pyx_k_SWIPE[] = "SWIPE";
 static const char __pyx_k_Shim6[] = "Shim6";
 static const char __pyx_k_VINES[] = "VINES";
+static const char __pyx_k_block[] = "block";
 static const char __pyx_k_manet[] = "manet";
 static const char __pyx_k_range[] = "range";
 static const char __pyx_k_HOPOPT[] = "HOPOPT";
@@ -1235,6 +1236,7 @@ static PyObject *__pyx_kp_s_any_distributed_file_system;
 static PyObject *__pyx_kp_s_any_host_internal_protocol;
 static PyObject *__pyx_kp_s_any_local_network;
 static PyObject *__pyx_kp_s_any_private_encryption_scheme;
+static PyObject *__pyx_n_s_block;
 static PyObject *__pyx_n_s_drop;
 static PyObject *__pyx_n_s_get;
 static PyObject *__pyx_n_s_get_mark;
@@ -1274,7 +1276,8 @@ static int __pyx_pf_14netfilterqueue_14NetfilterQueue___cinit__(struct __pyx_obj
 static void __pyx_pf_14netfilterqueue_14NetfilterQueue_2__dealloc__(struct __pyx_obj_14netfilterqueue_NetfilterQueue *__pyx_v_self); /* proto */
 static PyObject *__pyx_pf_14netfilterqueue_14NetfilterQueue_4bind(struct __pyx_obj_14netfilterqueue_NetfilterQueue *__pyx_v_self, int __pyx_v_queue_num, PyObject *__pyx_v_user_callback, u_int32_t __pyx_v_max_len, u_int8_t __pyx_v_mode, u_int32_t __pyx_v_range, u_int32_t __pyx_v_sock_len); /* proto */
 static PyObject *__pyx_pf_14netfilterqueue_14NetfilterQueue_6unbind(struct __pyx_obj_14netfilterqueue_NetfilterQueue *__pyx_v_self); /* proto */
-static PyObject *__pyx_pf_14netfilterqueue_14NetfilterQueue_8run(struct __pyx_obj_14netfilterqueue_NetfilterQueue *__pyx_v_self); /* proto */
+static PyObject *__pyx_pf_14netfilterqueue_14NetfilterQueue_8get_fd(struct __pyx_obj_14netfilterqueue_NetfilterQueue *__pyx_v_self); /* proto */
+static PyObject *__pyx_pf_14netfilterqueue_14NetfilterQueue_10run(struct __pyx_obj_14netfilterqueue_NetfilterQueue *__pyx_v_self, PyObject *__pyx_v_block); /* proto */
 static PyObject *__pyx_tp_new_14netfilterqueue_Packet(PyTypeObject *t, PyObject *a, PyObject *k); /*proto*/
 static PyObject *__pyx_tp_new_14netfilterqueue_NetfilterQueue(PyTypeObject *t, PyObject *a, PyObject *k); /*proto*/
 static PyObject *__pyx_int_0;
@@ -3293,7 +3296,7 @@ static PyObject *__pyx_pf_14netfilterqueue_6Packet_20repeat(struct __pyx_obj_14n
   return __pyx_r;
 }
 
-/* "netfilterqueue.pxd":177
+/* "netfilterqueue.pxd":178
  * 
  *     # From NFQ packet header:
  *     cdef readonly u_int32_t id             # <<<<<<<<<<<<<<
@@ -3320,7 +3323,7 @@ static PyObject *__pyx_pf_14netfilterqueue_6Packet_2id___get__(struct __pyx_obj_
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@@ -3337,7 +3340,7 @@ static PyObject *__pyx_pf_14netfilterqueue_6Packet_2id___get__(struct __pyx_obj_
   return __pyx_r;
 }
 
-/* "netfilterqueue.pxd":178
+/* "netfilterqueue.pxd":179
  *     # From NFQ packet header:
  *     cdef readonly u_int32_t id
  *     cdef readonly u_int16_t hw_protocol             # <<<<<<<<<<<<<<
@@ -3364,7 +3367,7 @@ static PyObject *__pyx_pf_14netfilterqueue_6Packet_11hw_protocol___get__(struct
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   __Pyx_RefNannySetupContext("__get__", 0);
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-  __pyx_t_1 = __Pyx_PyInt_From_u_int16_t(__pyx_v_self->hw_protocol); if (unlikely(!__pyx_t_1)) __PYX_ERR(1, 178, __pyx_L1_error)
+  __pyx_t_1 = __Pyx_PyInt_From_u_int16_t(__pyx_v_self->hw_protocol); if (unlikely(!__pyx_t_1)) __PYX_ERR(1, 179, __pyx_L1_error)
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@@ -3381,7 +3384,7 @@ static PyObject *__pyx_pf_14netfilterqueue_6Packet_11hw_protocol___get__(struct
   return __pyx_r;
 }
 
-/* "netfilterqueue.pxd":179
+/* "netfilterqueue.pxd":180
  *     cdef readonly u_int32_t id
  *     cdef readonly u_int16_t hw_protocol
  *     cdef readonly u_int8_t hook             # <<<<<<<<<<<<<<
@@ -3408,7 +3411,7 @@ static PyObject *__pyx_pf_14netfilterqueue_6Packet_4hook___get__(struct __pyx_ob
   PyObject *__pyx_t_1 = NULL;
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-  __pyx_t_1 = __Pyx_PyInt_From_u_int8_t(__pyx_v_self->hook); if (unlikely(!__pyx_t_1)) __PYX_ERR(1, 179, __pyx_L1_error)
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@@ -3425,7 +3428,7 @@ static PyObject *__pyx_pf_14netfilterqueue_6Packet_4hook___get__(struct __pyx_ob
   return __pyx_r;
 }
 
-/* "netfilterqueue.pxd":180
+/* "netfilterqueue.pxd":181
  *     cdef readonly u_int16_t hw_protocol
  *     cdef readonly u_int8_t hook
  *     cdef readonly u_int32_t mark             # <<<<<<<<<<<<<<
@@ -3452,7 +3455,7 @@ static PyObject *__pyx_pf_14netfilterqueue_6Packet_4mark___get__(struct __pyx_ob
   PyObject *__pyx_t_1 = NULL;
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-  __pyx_t_1 = __Pyx_PyInt_From_u_int32_t(__pyx_v_self->mark); if (unlikely(!__pyx_t_1)) __PYX_ERR(1, 180, __pyx_L1_error)
+  __pyx_t_1 = __Pyx_PyInt_From_u_int32_t(__pyx_v_self->mark); if (unlikely(!__pyx_t_1)) __PYX_ERR(1, 181, __pyx_L1_error)
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@@ -3469,7 +3472,7 @@ static PyObject *__pyx_pf_14netfilterqueue_6Packet_4mark___get__(struct __pyx_ob
   return __pyx_r;
 }
 
-/* "netfilterqueue.pxd":184
+/* "netfilterqueue.pxd":185
  *     # Packet details:
  *     cdef Py_ssize_t payload_len
  *     cdef readonly char *payload             # <<<<<<<<<<<<<<
@@ -3496,7 +3499,7 @@ static PyObject *__pyx_pf_14netfilterqueue_6Packet_7payload___get__(struct __pyx
   PyObject *__pyx_t_1 = NULL;
   __Pyx_RefNannySetupContext("__get__", 0);
   __Pyx_XDECREF(__pyx_r);
-  __pyx_t_1 = __Pyx_PyBytes_FromString(__pyx_v_self->payload); if (unlikely(!__pyx_t_1)) __PYX_ERR(1, 184, __pyx_L1_error)
+  __pyx_t_1 = __Pyx_PyBytes_FromString(__pyx_v_self->payload); if (unlikely(!__pyx_t_1)) __PYX_ERR(1, 185, __pyx_L1_error)
   __Pyx_GOTREF(__pyx_t_1);
   __pyx_r = __pyx_t_1;
   __pyx_t_1 = 0;
@@ -4188,36 +4191,140 @@ static PyObject *__pyx_pf_14netfilterqueue_14NetfilterQueue_6unbind(struct __pyx
 /* "netfilterqueue.pyx":193
  *         # See warning about nfq_unbind_pf in __dealloc__ above.
  * 
- *     def run(self):             # <<<<<<<<<<<<<<
- *         """Begin accepting packets."""
- *         cdef int fd = nfq_fd(self.h)
+ *     def get_fd(self):             # <<<<<<<<<<<<<<
+ *         """Get the file descriptor of the queue handler."""
+ *         return nfq_fd(self.h)
  */
 
 /* Python wrapper */
-static PyObject *__pyx_pw_14netfilterqueue_14NetfilterQueue_9run(PyObject *__pyx_v_self, CYTHON_UNUSED PyObject *unused); /*proto*/
-static char __pyx_doc_14netfilterqueue_14NetfilterQueue_8run[] = "Begin accepting packets.";
-static PyObject *__pyx_pw_14netfilterqueue_14NetfilterQueue_9run(PyObject *__pyx_v_self, CYTHON_UNUSED PyObject *unused) {
+static PyObject *__pyx_pw_14netfilterqueue_14NetfilterQueue_9get_fd(PyObject *__pyx_v_self, CYTHON_UNUSED PyObject *unused); /*proto*/
+static char __pyx_doc_14netfilterqueue_14NetfilterQueue_8get_fd[] = "Get the file descriptor of the queue handler.";
+static PyObject *__pyx_pw_14netfilterqueue_14NetfilterQueue_9get_fd(PyObject *__pyx_v_self, CYTHON_UNUSED PyObject *unused) {
   PyObject *__pyx_r = 0;
   __Pyx_RefNannyDeclarations
-  __Pyx_RefNannySetupContext("run (wrapper)", 0);
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-static PyObject *__pyx_pf_14netfilterqueue_14NetfilterQueue_8run(struct __pyx_obj_14netfilterqueue_NetfilterQueue *__pyx_v_self) {
+static PyObject *__pyx_pf_14netfilterqueue_14NetfilterQueue_8get_fd(struct __pyx_obj_14netfilterqueue_NetfilterQueue *__pyx_v_self) {
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+ * 
+ *     def run(self, block=True):
+ */
+  __Pyx_XDECREF(__pyx_r);
+  __pyx_t_1 = __Pyx_PyInt_From_int(nfq_fd(__pyx_v_self->h)); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 195, __pyx_L1_error)
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+  /* "netfilterqueue.pyx":193
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+ * 
+ *     def get_fd(self):             # <<<<<<<<<<<<<<
+ *         """Get the file descriptor of the queue handler."""
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+ */
+
+  /* function exit code */
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+  __Pyx_AddTraceback("netfilterqueue.NetfilterQueue.get_fd", __pyx_clineno, __pyx_lineno, __pyx_filename);
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+ *     def run(self, block=True):             # <<<<<<<<<<<<<<
+ *         """Begin accepting packets."""
+ *         cdef int fd = nfq_fd(self.h)
+ */
+
+/* Python wrapper */
+static PyObject *__pyx_pw_14netfilterqueue_14NetfilterQueue_11run(PyObject *__pyx_v_self, PyObject *__pyx_args, PyObject *__pyx_kwds); /*proto*/
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+static PyObject *__pyx_pw_14netfilterqueue_14NetfilterQueue_11run(PyObject *__pyx_v_self, PyObject *__pyx_args, PyObject *__pyx_kwds) {
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+static PyObject *__pyx_pf_14netfilterqueue_14NetfilterQueue_10run(struct __pyx_obj_14netfilterqueue_NetfilterQueue *__pyx_v_self, PyObject *__pyx_v_block) {
   int __pyx_v_fd;
   char __pyx_v_buf[0x1000];
   int __pyx_v_rv;
+  int __pyx_v_recv_flags;
   PyObject *__pyx_r = NULL;
   __Pyx_RefNannyDeclarations
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-  /* "netfilterqueue.pyx":195
- *     def run(self):
+  /* "netfilterqueue.pyx":199
+ *     def run(self, block=True):
  *         """Begin accepting packets."""
  *         cdef int fd = nfq_fd(self.h)             # <<<<<<<<<<<<<<
  *         cdef char buf[BufferSize]
@@ -4225,20 +4332,35 @@ static PyObject *__pyx_pf_14netfilterqueue_14NetfilterQueue_8run(struct __pyx_ob
  */
   __pyx_v_fd = nfq_fd(__pyx_v_self->h);
 
-  /* "netfilterqueue.pyx":198
- *         cdef char buf[BufferSize]
+  /* "netfilterqueue.pyx":203
  *         cdef int rv
+ *         cdef int recv_flags
+ *         recv_flags = 0 if block else MSG_DONTWAIT             # <<<<<<<<<<<<<<
+ * 
+ *         while True:
+ */
+  __pyx_t_2 = __Pyx_PyObject_IsTrue(__pyx_v_block); if (unlikely(__pyx_t_2 < 0)) __PYX_ERR(0, 203, __pyx_L1_error)
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+  }
+  __pyx_v_recv_flags = __pyx_t_1;
+
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+ *         recv_flags = 0 if block else MSG_DONTWAIT
+ * 
  *         while True:             # <<<<<<<<<<<<<<
  *             with nogil:
- *                 rv = recv(fd, buf, sizeof(buf), 0)
+ *                 rv = recv(fd, buf, sizeof(buf), recv_flags)
  */
   while (1) {
 
-    /* "netfilterqueue.pyx":199
- *         cdef int rv
+    /* "netfilterqueue.pyx":206
+ * 
  *         while True:
  *             with nogil:             # <<<<<<<<<<<<<<
- *                 rv = recv(fd, buf, sizeof(buf), 0)
+ *                 rv = recv(fd, buf, sizeof(buf), recv_flags)
  *             if (rv >= 0):
  */
     {
@@ -4248,21 +4370,21 @@ static PyObject *__pyx_pf_14netfilterqueue_14NetfilterQueue_8run(struct __pyx_ob
         #endif
         /*try:*/ {
 
-          /* "netfilterqueue.pyx":200
+          /* "netfilterqueue.pyx":207
  *         while True:
  *             with nogil:
- *                 rv = recv(fd, buf, sizeof(buf), 0)             # <<<<<<<<<<<<<<
+ *                 rv = recv(fd, buf, sizeof(buf), recv_flags)             # <<<<<<<<<<<<<<
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  *                 nfq_handle_packet(self.h, buf, rv)
  */
-          __pyx_v_rv = recv(__pyx_v_fd, __pyx_v_buf, (sizeof(__pyx_v_buf)), 0);
+          __pyx_v_rv = recv(__pyx_v_fd, __pyx_v_buf, (sizeof(__pyx_v_buf)), __pyx_v_recv_flags);
         }
 
-        /* "netfilterqueue.pyx":199
- *         cdef int rv
+        /* "netfilterqueue.pyx":206
+ * 
  *         while True:
  *             with nogil:             # <<<<<<<<<<<<<<
- *                 rv = recv(fd, buf, sizeof(buf), 0)
+ *                 rv = recv(fd, buf, sizeof(buf), recv_flags)
  *             if (rv >= 0):
  */
         /*finally:*/ {
@@ -4276,18 +4398,18 @@ static PyObject *__pyx_pf_14netfilterqueue_14NetfilterQueue_8run(struct __pyx_ob
         }
     }
 
-    /* "netfilterqueue.pyx":201
+    /* "netfilterqueue.pyx":208
  *             with nogil:
- *                 rv = recv(fd, buf, sizeof(buf), 0)
+ *                 rv = recv(fd, buf, sizeof(buf), recv_flags)
  *             if (rv >= 0):             # <<<<<<<<<<<<<<
  *                 nfq_handle_packet(self.h, buf, rv)
  *             else:
  */
-    __pyx_t_1 = ((__pyx_v_rv >= 0) != 0);
-    if (__pyx_t_1) {
+    __pyx_t_2 = ((__pyx_v_rv >= 0) != 0);
+    if (__pyx_t_2) {
 
-      /* "netfilterqueue.pyx":202
- *                 rv = recv(fd, buf, sizeof(buf), 0)
+      /* "netfilterqueue.pyx":209
+ *                 rv = recv(fd, buf, sizeof(buf), recv_flags)
  *             if (rv >= 0):
  *                 nfq_handle_packet(self.h, buf, rv)             # <<<<<<<<<<<<<<
  *             else:
@@ -4295,9 +4417,9 @@ static PyObject *__pyx_pf_14netfilterqueue_14NetfilterQueue_8run(struct __pyx_ob
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       nfq_handle_packet(__pyx_v_self->h, __pyx_v_buf, __pyx_v_rv);
 
-      /* "netfilterqueue.pyx":201
+      /* "netfilterqueue.pyx":208
  *             with nogil:
- *                 rv = recv(fd, buf, sizeof(buf), 0)
+ *                 rv = recv(fd, buf, sizeof(buf), recv_flags)
  *             if (rv >= 0):             # <<<<<<<<<<<<<<
  *                 nfq_handle_packet(self.h, buf, rv)
  *             else:
@@ -4305,7 +4427,7 @@ static PyObject *__pyx_pf_14netfilterqueue_14NetfilterQueue_8run(struct __pyx_ob
       goto __pyx_L10;
     }
 
-    /* "netfilterqueue.pyx":204
+    /* "netfilterqueue.pyx":211
  *                 nfq_handle_packet(self.h, buf, rv)
  *             else:
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@@ -4313,10 +4435,10 @@ static PyObject *__pyx_pf_14netfilterqueue_14NetfilterQueue_8run(struct __pyx_ob
  * 
  */
     /*else*/ {
-      __pyx_t_1 = ((errno != __pyx_e_14netfilterqueue_ENOBUFS) != 0);
-      if (__pyx_t_1) {
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-        /* "netfilterqueue.pyx":205
+        /* "netfilterqueue.pyx":212
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@@ -4325,7 +4447,7 @@ static PyObject *__pyx_pf_14netfilterqueue_14NetfilterQueue_8run(struct __pyx_ob
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         goto __pyx_L4_break;
 
-        /* "netfilterqueue.pyx":204
+        /* "netfilterqueue.pyx":211
  *                 nfq_handle_packet(self.h, buf, rv)
  *             else:
  *                 if errno != ENOBUFS:             # <<<<<<<<<<<<<<
@@ -4338,16 +4460,21 @@ static PyObject *__pyx_pf_14netfilterqueue_14NetfilterQueue_8run(struct __pyx_ob
   }
   __pyx_L4_break:;
 
-  /* "netfilterqueue.pyx":193
- *         # See warning about nfq_unbind_pf in __dealloc__ above.
+  /* "netfilterqueue.pyx":197
+ *         return nfq_fd(self.h)
  * 
- *     def run(self):             # <<<<<<<<<<<<<<
+ *     def run(self, block=True):             # <<<<<<<<<<<<<<
  *         """Begin accepting packets."""
  *         cdef int fd = nfq_fd(self.h)
  */
 
   /* function exit code */
   __pyx_r = Py_None; __Pyx_INCREF(Py_None);
+  goto __pyx_L0;
+  __pyx_L1_error:;
+  __Pyx_AddTraceback("netfilterqueue.NetfilterQueue.run", __pyx_clineno, __pyx_lineno, __pyx_filename);
+  __pyx_r = NULL;
+  __pyx_L0:;
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@@ -4549,7 +4676,8 @@ static int __pyx_tp_clear_14netfilterqueue_NetfilterQueue(PyObject *o) {
 static PyMethodDef __pyx_methods_14netfilterqueue_NetfilterQueue[] = {
   {"bind", (PyCFunction)__pyx_pw_14netfilterqueue_14NetfilterQueue_5bind, METH_VARARGS|METH_KEYWORDS, __pyx_doc_14netfilterqueue_14NetfilterQueue_4bind},
   {"unbind", (PyCFunction)__pyx_pw_14netfilterqueue_14NetfilterQueue_7unbind, METH_NOARGS, __pyx_doc_14netfilterqueue_14NetfilterQueue_6unbind},
-  {"run", (PyCFunction)__pyx_pw_14netfilterqueue_14NetfilterQueue_9run, METH_NOARGS, __pyx_doc_14netfilterqueue_14NetfilterQueue_8run},
+  {"get_fd", (PyCFunction)__pyx_pw_14netfilterqueue_14NetfilterQueue_9get_fd, METH_NOARGS, __pyx_doc_14netfilterqueue_14NetfilterQueue_8get_fd},
+  {"run", (PyCFunction)__pyx_pw_14netfilterqueue_14NetfilterQueue_11run, METH_VARARGS|METH_KEYWORDS, __pyx_doc_14netfilterqueue_14NetfilterQueue_10run},
   {0, 0, 0, 0}
 };
 
@@ -4792,6 +4920,7 @@ static __Pyx_StringTabEntry __pyx_string_tab[] = {
   {&__pyx_kp_s_any_host_internal_protocol, __pyx_k_any_host_internal_protocol, sizeof(__pyx_k_any_host_internal_protocol), 0, 0, 1, 0},
   {&__pyx_kp_s_any_local_network, __pyx_k_any_local_network, sizeof(__pyx_k_any_local_network), 0, 0, 1, 0},
   {&__pyx_kp_s_any_private_encryption_scheme, __pyx_k_any_private_encryption_scheme, sizeof(__pyx_k_any_private_encryption_scheme), 0, 0, 1, 0},
+  {&__pyx_n_s_block, __pyx_k_block, sizeof(__pyx_k_block), 0, 0, 1, 1},
   {&__pyx_n_s_drop, __pyx_k_drop, sizeof(__pyx_k_drop), 0, 0, 1, 1},
   {&__pyx_n_s_get, __pyx_k_get, sizeof(__pyx_k_get), 0, 0, 1, 1},
   {&__pyx_n_s_get_mark, __pyx_k_get_mark, sizeof(__pyx_k_get_mark), 0, 0, 1, 1},
@@ -5192,158 +5321,158 @@ PyMODINIT_FUNC PyInit_netfilterqueue(void)
  */
   __pyx_k__4 = NFQNL_COPY_PACKET;
 
-  /* "netfilterqueue.pyx":208
+  /* "netfilterqueue.pyx":215
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   __Pyx_DECREF(__pyx_t_1); __pyx_t_1 = 0;
 
   /* "netfilterqueue.pyx":1
diff --git a/netfilterqueue.pxd b/netfilterqueue.pxd
index 4cd3a47..5827c11 100644
--- a/netfilterqueue.pxd
+++ b/netfilterqueue.pxd
@@ -152,6 +152,7 @@ cdef enum: #  Protocol families, same as address families.
 
 cdef extern from "sys/socket.h":
     ssize_t recv(int __fd, void *__buf, size_t __n, int __flags) nogil
+    int MSG_DONTWAIT
 
 # Dummy defines from linux/netfilter.h
 cdef enum:
diff --git a/netfilterqueue.pyx b/netfilterqueue.pyx
index 485c507..cdceb1d 100644
--- a/netfilterqueue.pyx
+++ b/netfilterqueue.pyx
@@ -190,14 +190,21 @@ cdef class NetfilterQueue:
         self.qh = NULL
         # See warning about nfq_unbind_pf in __dealloc__ above.
 
-    def run(self):
+    def get_fd(self):
+        """Get the file descriptor of the queue handler."""
+        return nfq_fd(self.h)
+
+    def run(self, block=True):
         """Begin accepting packets."""
         cdef int fd = nfq_fd(self.h)
         cdef char buf[BufferSize]
         cdef int rv
+        cdef int recv_flags
+        recv_flags = 0 if block else MSG_DONTWAIT
+
         while True:
             with nogil:
-                rv = recv(fd, buf, sizeof(buf), 0)
+                rv = recv(fd, buf, sizeof(buf), recv_flags)
             if (rv >= 0):
                 nfq_handle_packet(self.h, buf, rv)
             else: