c - Dropping root privileges -

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I have a daemon that is started as root (hence it can be tied to low ports). After initialization I want to leave the root privileges for security reasons.

Does anyone indicate a known right code in C who will do this?

I have read the man page, I have seen its various implementations in different applications, and they all are different, and some of them are really complex, this is security-related code, and I actually Do not want to change the same mistakes again, which other people are doing. What I see is a best practice, which is a good, portable library function, which I can use in the knowledge that it must be received properly. Is there such a thing?

For reference: I am starting as root; I need to change to run under a different UID and GID; I need to set up the supplemental group correctly; I do not need to change later in root privileges.

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