1 Kings 4-6

The begining of chapter 4 is composed of a list of high officials in Solomon's court. One of the men mentioned was Zabud. He was the son of Nathan and was priest while Solomon was king. Zabud also had the distinction of being called the king's friend (verse 5). I wonder what it meant to be considered Solomon's friend? Does that mean Zabud and Solomon hung out with each other? Or was that a time when Solomon asked Zabud for painfully honest throughts on what the King had done or was planning to do. Maybe Zabud was the first to know that Solomon was straying from God's purpose for him. Being the friend of the king could be very demanding. I wonder what sort of friend I would have been to Solomon?
It took me about 20 minutes to read this passage.
Stuart