How to create a linux user using C/C++?

Question

I would like to build a program which takes a username as parameter and creates the user and its home folder (with some hard-coded specifications like folde

Answer 1

Probably your best bet is to invoke useradd; it will do the right things (given appropriate parameters).

Trying to create one manually by calling the appropriate APIs is possible but not desirable.

Answer 2

You mean like adduser or useradd? Try looking at their source code.

Answer 3

There is no API for this. You just write into /etc/passwd and /etc/group (and possibly the shadow versions as well) using normal file access system calls.