Socket Pair

#include<sys/types.h>
#include<sys/socket.h>
int socketpair(int domain, int type, int protocol, int sv[2]);

The socketpair() call creates a pair of connected sockets in the specified domain, of the specified type, and using the optionally specified protocol.

The file descriptors used in referencing the new sockets are returned in sv[0] and sv[1] respectively.

On success, the method returns 0, on error -1, and error information is found in errno.