How to get the MAC address ipad

How to get the MAC address ipad
Reply:

 # include  
# Include  
# Include  
# Include  
# Include  
# Include  


char * getMacAddress (char * macAddress, char * ifName) {

int success; 
struct ifaddrs * addrs; 
struct ifaddrs * cursor; 
const struct sockaddr_dl * dlAddr; 
const unsigned char * base; 
int i; 

success = getifaddrs (& addrs) == 0; 
if (success) {
cursor = addrs; 
while (cursor! = 0) {
if ((cursor-> ifa_addr-> sa_family == AF_LINK) 
&& (((Const struct sockaddr_dl *) cursor-> ifa_addr) -> sdl_type == IFT_ETHER) && strcmp (ifName, cursor-> ifa_name) == 0) {
dlAddr = (const struct sockaddr_dl *) cursor-> ifa_addr; 
base = (const unsigned char *) & dlAddr-> sdl_data [dlAddr-> sdl_nlen]; 
strcpy (macAddress, ""); 
for (i = 0; i  sdl_alen; i + +) {
if (i! = 0) {
strcat (macAddress, ":"); 
} 
char partialAddr [3]; 
sprintf (partialAddr, "% 02X", base [i]); 
strcat (macAddress, partialAddr); 

} 
} 
cursor = cursor-> ifa_next; 
} 

freeifaddrs (addrs); 
} 
return macAddress; 
} 

 char * macAddressString = (char *) malloc (18); 
NSString * macAddress = [[NSString alloc] initWithCString: getMacAddress (macAddressString, "en0") 
encoding: NSMacOSRomanStringEncoding]; 

You should be asking how to write code to obtain it? ?
Did not ask how to find from the set
Reply:
getMacAddress second argument ifName What does this mean