tmyetheraddr.c - plan9port - [fork] Plan 9 from user space
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       ---
       tmyetheraddr.c (449B)
       ---
            1 #include <u.h>
            2 #include <libc.h>
            3 #include <ip.h>
            4 
            5 static char zea[6];
            6 
            7 int
            8 myetheraddr(uchar *to, char *dev)
            9 {
           10         Ipifc *ifclist, *ifc;
           11 
           12         ifclist = readipifc(nil, nil, -1);
           13         for(ifc=ifclist; ifc; ifc=ifc->next){
           14                 if(dev && strcmp(ifc->dev, dev) != 0)
           15                         continue;
           16                 if(memcmp(zea, ifc->ether, 6) == 0)
           17                         continue;
           18                 memmove(to, ifc->ether, 6);
           19                 freeipifc(ifclist);
           20                 return 0;
           21         }
           22         freeipifc(ifclist);
           23         werrstr("no ethernet devices");
           24         return -1;
           25 }