At the top of your application, include vmci_sockets.h and declare a constant for the socket buffer size. In the example below, BUFSIZE defines the socket buffer size. The number 4096 is a good choice for efficiency on multiple platforms. It is not based on the size of a TCP packet, which is usually smaller. 

#include "vmci_sockets.h"
#define BUFSIZE 4096

To compile on Windows, you must also call the Winsock WSAStartup() function. 

err = WSAStartup(versionRequested, &wsaData);
if (err != 0) { 
				printf(stderr, "Could not register with Winsock DLL.\n"); 
				goto cleanup;
}

This is not necessary on non-Windows systems.

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