[Python-Dev] [python 2.7] a question about exporting a new method to socket object

[Ani Sinha]

Hi python devs :

As a part of exploring an idea, I am trying to add a new method to the
python socket object. Here's what I have been trying to do (the patch may
be whitespace damaged so please bear with me) :


Index: Python-2.7/Modules/socketmodule.c
===
--- Python-2.7.orig/Modules/socketmodule.c
+++ Python-2.7/Modules/socketmodule.c
@@ -126,6 +126,7 @@ makefile([mode, [bufsize]]) -- return a
 recv(buflen[, flags]) -- receive data\n\
 recv_into(buffer[, nbytes[, flags]]) -- receive data (into a buffer)\n\
 recvfrom(buflen[, flags]) -- receive data and sender\'s address\n\
+arecvfrom(buflen[, flags]) -- same as recvfrom \n\
 recvfrom_into(buffer[, nbytes, [, flags])\n\
   -- receive data and sender\'s address (into a buffer)\n\
 sendall(data[, flags]) -- send all data\n\
@@ -468,6 +469,13 @@ static PyTypeObject sock_type;
 #define IS_SELECTABLE(s) ((s)-sock_fd  FD_SETSIZE || s-sock_timeout =
0.0)
 #endif

@@ -2620,6 +2802,58 @@ PyDoc_STRVAR(recvfrom_doc,
 \n\
 Like recv(buffersize, flags) but also return the sender's address info.);

+static PyObject *
+sock_arecvfrom(PySocketSockObject *s, PyObject *args)
+{
+return sock_recvfrom(s,args);
+}
+
+PyDoc_STRVAR(arecvfrom_doc,
+arecvfrom(buffersize[, flags]) - (data, address info)\n\
+\n\
+ experimental stuff);

 /* s.recvfrom_into(buffer[, nbytes [,flags]]) method */

@@ -2963,6 +3197,8 @@ static PyMethodDef sock_methods[] = {
   recv_into_doc},
 {recvfrom,  (PyCFunction)sock_recvfrom, METH_VARARGS,
   recvfrom_doc},
+{arecvfrom,  (PyCFunction)sock_arecvfrom, METH_VARARGS,
+  arecvfrom_doc},
 {recvfrom_into,  (PyCFunction)sock_recvfrom_into, METH_VARARGS |
METH_KEYWORDS,
   recvfrom_into_doc},
 {send,  (PyCFunction)sock_send, METH_VARARGS,


When I compile this and run a simple script like the following that uses
arecvfrom() :

sock = socket.socket( socket.PF_PACKET, socket.SOCK_RAW )
sock.bind( ( intf, ETH_P_ALL ) )

(pkt,dontcare) = dst.arecvfrom( 500, socket.MSG_DONTWAIT )

I get this exception :

AttributeError: '_socketobject' object has no attribute 'arecvfrom'

So what am I doing wrong? How do I export this new socket method?

any help/pointer will be greatly appreciated.

cheers,
ani

-- 
Ani
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Re: [Python-Dev] [python 2.7] a question about exporting a new method to socket object

[Ani Sinha]

Hi Guido :

Thanks a lot. That helped.

I will try StackOverflow next time.

cheers,
ani



On Fri, Jun 21, 2013 at 8:07 AM, Guido van Rossum gu...@python.org wrote:

 Technically this list isn't the right place, but you probably are
 bitten by the duplication of functionality in Lib/socket.py. There's a
 list of methods at the top of that file, _socketmethods.

 But you really shouldn't be asking here -- this list is for changes to
 Python, not using or hacking it. (Try StackOverflow for that.)

 --Guido

 On Thu, Jun 20, 2013 at 10:18 PM, Ani Sinha a...@aristanetworks.com
 wrote:
  Hi python devs :
 
  As a part of exploring an idea, I am trying to add a new method to the
  python socket object. Here's what I have been trying to do (the patch
 may be
  whitespace damaged so please bear with me) :
 
 
  Index: Python-2.7/Modules/socketmodule.c
  ===
  --- Python-2.7.orig/Modules/socketmodule.c
  +++ Python-2.7/Modules/socketmodule.c
  @@ -126,6 +126,7 @@ makefile([mode, [bufsize]]) -- return a
   recv(buflen[, flags]) -- receive data\n\
   recv_into(buffer[, nbytes[, flags]]) -- receive data (into a buffer)\n\
   recvfrom(buflen[, flags]) -- receive data and sender\'s address\n\
  +arecvfrom(buflen[, flags]) -- same as recvfrom \n\
   recvfrom_into(buffer[, nbytes, [, flags])\n\
 -- receive data and sender\'s address (into a buffer)\n\
   sendall(data[, flags]) -- send all data\n\
  @@ -468,6 +469,13 @@ static PyTypeObject sock_type;
   #define IS_SELECTABLE(s) ((s)-sock_fd  FD_SETSIZE || s-sock_timeout
 =
  0.0)
   #endif
 
  @@ -2620,6 +2802,58 @@ PyDoc_STRVAR(recvfrom_doc,
   \n\
   Like recv(buffersize, flags) but also return the sender's address
 info.);
 
  +static PyObject *
  +sock_arecvfrom(PySocketSockObject *s, PyObject *args)
  +{
  +return sock_recvfrom(s,args);
  +}
  +
  +PyDoc_STRVAR(arecvfrom_doc,
  +arecvfrom(buffersize[, flags]) - (data, address info)\n\
  +\n\
  + experimental stuff);
 
   /* s.recvfrom_into(buffer[, nbytes [,flags]]) method */
 
  @@ -2963,6 +3197,8 @@ static PyMethodDef sock_methods[] = {
 recv_into_doc},
   {recvfrom,  (PyCFunction)sock_recvfrom, METH_VARARGS,
 recvfrom_doc},
  +{arecvfrom,  (PyCFunction)sock_arecvfrom, METH_VARARGS,
  +  arecvfrom_doc},
   {recvfrom_into,  (PyCFunction)sock_recvfrom_into, METH_VARARGS |
  METH_KEYWORDS,
 recvfrom_into_doc},
   {send,  (PyCFunction)sock_send, METH_VARARGS,
 
 
  When I compile this and run a simple script like the following that uses
  arecvfrom() :
 
  sock = socket.socket( socket.PF_PACKET, socket.SOCK_RAW )
  sock.bind( ( intf, ETH_P_ALL ) )
 
  (pkt,dontcare) = dst.arecvfrom( 500, socket.MSG_DONTWAIT )
 
  I get this exception :
 
  AttributeError: '_socketobject' object has no attribute 'arecvfrom'
 
  So what am I doing wrong? How do I export this new socket method?
 
  any help/pointer will be greatly appreciated.
 
  cheers,
  ani
 
  --
  Ani
 
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 --
 --Guido van Rossum (python.org/~guido)




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[Python-Dev] About issue 6560

[Ani Sinha]

Hi :

I was looking into a mechanism to get the aux fields from recvmsg() in
python and I came across this issue. Looks like this feature was added
in python 3.3. Is there any reason why this feature was not added for
python 2.7? I am now trying to backport the patch to python 2.7.

any insight into this would be appreciated.

Thanks
ani
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