Hi,

  Please tell me which function i can use to get the physical address

 In C language.

Please visit a SCO UNIX specific newsgroup; your query has nothing
to do with the C language and is annoyingly clueless. How
do you expect to find the MAC address of your system when you can't
even find the right newsgroup to ask a simple question?

typedef struct strLocaladdress{
  unsigned char   network[4];
  unsigned char   node[6];
    };

struct strLocaladdress local_address;

void GetLocalAddress(struct strLocaladdress __far *pla)
   {
      union _REGS reg;
      struct _SREGS sreg;

      reg.x.bx=0x0009;
      sreg.es=_FP_SEG(pla);
      reg.x.si=_FP_OFF(pla);
      _int86x(0x7A,&reg,&reg,&sreg);
   }

and then call it by:

 static struct strLocaladdress local_address;
 GetLocalAddress(&local_address);

The GetLocalAdress function you probably have to rewrite, because it's a
call to
one of the previously loaded drivers, that have added/changed an interrupt
call.

I use it to make several old,small dos machines communicate with each other.

Denie Andriessen
D dot Andriessen at pink.nl  (you know what to do with this...)

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The standard C language does not support what you want to do. Please
consider asking the Unix programming experts to get detailed Unix
specific advice:

Stephan
(initiator of the campaign against grumpiness in c.l.c)

[lots's of very system specific stuff]

Just keep in mind that the solution of Denie Andriessen is absolutely
non portable and very far outside the realms of standard C. It will
probably only work with one very specific compiler and a very specific
compiler parameter list.

Topics like like this are much better suited for:

Stephan
(initiator of the campaign against grumpiness in c.l.c)