[C++] How to construct ICMP echo request

[NeoIndigo]

Hi guys,
It's my first time trying to create a packet in C++. So, what i have done so far are:
1. I have opened a packet level raw socket. Using this command:
sd = socket(PF_PACKET,SOCK_RAW,ETHERTYPE_IP) ;

2. I have gotten the interface number corresponding to interface name.
Using the command:
ioRtnCode = ioctl(sd,SIOCGIFINDEX,&ifioctl) ;

here, &ifioctl is supplied with eht1, in the ifrn_name from 0 to 4.

3. I have also created the address structure used for a packet socket. This address will be loaded in the frame.

So, my next step is to create the ICMP itself. How should I do this ? I mean, is there a special function or library to do so ? or should i just start from an array ?

Of course, this ICMP message later on will be framed to IP and to Ethernet.

Thanks,