[Libvir] Any sample code to use virConnectOpenAuth() in C binding ?

Hello All, Can anyone provide me sample code for connecting hypervisor using credentials. As of now i have implemented using(virConnectOpen(NULL)) , but this function does not takes any credential information. I saw that there is function (virConnectOpenAuth()) which can be used , but i don;t know any way to implement Thanks in advance. -- Regards Arun Sharma 0-934-829-3810