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 guido@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 ani@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)