How to write a file under the superuser name in PL C?

Question

linux

The matter is that I create application with the interface and at certain actions the rights of the superuser are necessary. Well, let's say for configuring apache. And for other actions it is not necessary. Logically, I want to do this: when setting up Apache, ask for the password from the superuser, then edit the file on behalf of the root. Actually the question is: how to write a file under root in C?

Answer 1

look towards gksudo, fork, execl

Answer 2

man7.org/linux/man-pages/man2/setuid.2.html