From Forum Nokia Wiki

The socket method creates an endpoint for communication.

int socket (int domain, int type, int protocol);

The socket system call creates an endpoint for communication and returns a descriptor.

The domain argument specifies a communications domain within which communication will take place; this selects the protocol family which should be used. These families are defined in the include file sys/socket.h. The protocol argument specifies a particular protocol to be used with the socket.

Following code snippet shows the usage of socket function:

#include <sys/socket.h>
#include <unistd.h>
#include <stdio.h>
#inlcude <netinet/in.h>
void SocketExample()
{
    int sock_fd;
    sock_fd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
    close(sock_fd);
}

Wiki Links

Open C Sockets Overview