Ioctl problem

[kanhu]

I want to add an alias IP into a particular interface through ioclt
call. I used SIOCSIFADDR and SIOCSIFNETMASK to add the IP with the
netmask. one problem here i am facing, instead of adding the alias IP it
replace the actual IP of that interface. In my code i gave the interface
name as "eth0" not "eth0:0 or eth0:1" due to some constrain.

int add_alias_ip(){
        struct ifreq   ifr;
        int sockfd;

if( (sockfd=socket(AF_INET,SOCK_DGRAM,0))<0){
    	.....................
    	.....................                
        }
        memset (&ifr, '\0', sizeof (ifr));

ifr.ifr_addr=AF_INET;
        ifr.ifr_dstaddr=AF_INET;
        ifr.ifr_netmask=AF_INET;

strncpy (ifr.ifr_name, "eth0", 4);

((struct sockaddr_in *) &ifr.ifr_addr)->sin_addr.s_addr =
inet_addr("192.168.50.11");

if (ioctl(sockfd, SIOCSIFADDR, &ifr) < 0) {
                .................
    	.................
        }

((struct sockaddr_in *) &ifr.ifr_netmask)->sin_addr.s_addr =
inet_addr("255.255.255.192");
        if (ioctl(sockfd, SIOCSIFNETMASK, &ifr) < 0) {
        	...................
    	...................
        }

return 0;
}

With Regards,
Kanhu

pls give some suggestion.........