Re: [ns] New headers in ns

["Madhan Mohan" <madhan80@eth.net>]

You have to add the code
int hdr_xsping::offset_ ; 
before the static XPingHeaderClass in xping.cc

Madhan


----- Original Message ----- 
From: Massimo Sotgiu <drdeep@inwind.it>
To: <ns-users@ISI.EDU>
Sent: Saturday, September 22, 2001 6:44 PM
Subject: [ns] New headers in ns


> Hi, I'm trying to do my thesis with ns, but it isn't so easy :-)
> For now, my problem is how to enable new headers in ns.
> I write the following lines in xping.h:
> 
> ... ...
> struct hdr_xping
> {
>    char ret;
>    double send_time;
>    static int offset_;
>    inline static int& offset() { return offset_; }
>    inline static hdr_xping* access(const Packet* p)
>    {
>       return (hdr_xping*) p->access(offset_);
>    }
> };
> ... ...
> 
> 
> and then in xping.cc
> 
> ... ...
> static class XPingHeaderClass : public PacketHeaderClass
> {
>    public:
>       XPingHeaderClass() : PacketHeaderClass("PacketHeader/XPing",
> sizeof(hdr_xping))
>       {
>          bind_offset(&hdr_xping::offset_);
>       }
> } class_xpinghdr;
> ... ...
> I've also modified packet.h and ns-packet.tcl, but after compiling, the
> linker give me these errors:
> 
> xping.o: In function `XPingAgent::command(int, char const *const *)':
> xping.o(.text+0xac): undefined reference to `hdr_xping::offset_'
> xping.o: In function `XPingAgent::recv(Packet *, Handler *)':
> xping.o(.text+0x133): undefined reference to `hdr_xping::offset_'
> xping.o(.text+0x1cc): undefined reference to `hdr_xping::offset_'
> xping.o: In function `__static_initialization_and_destruction_0':
> xping.o(.text+0x347): undefined reference to `hdr_xping::offset_'
> collect2: ld returned 1 exit status
> make: *** [ns] Error 1
> 
> 
> How do I do to solve my problem?
> Thanks to all,
>    Max
> 
> 
> 
> -----------------------------
>  Massimo Sotgiu
>  drdeep@inwind.it
>  University of Udine - Italy
> -----------------------------
>