[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 <guido at 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 at 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
> >
> > _______________________________________________
> > Python-Dev mailing list
> > Python-Dev at python.org
> > http://mail.python.org/mailman/listinfo/python-dev
> > Unsubscribe:
> > http://mail.python.org/mailman/options/python-dev/guido%40python.org
> >
>
>
>
> --
> --Guido van Rossum (python.org/~guido)
>



-- 
Ani
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