Question

Using my c++ program how can I find out what group the current user running my program belongs to? So my program need to figure out a couple of things :

1. The current username of the user
2. The group the user belongs to

How can do the above 2 using c++ on a RedHat / Linux machine?

Answer 1

With getuid(2) and getgid(2). See credentials(7) for more information.

Use getpwuid(3) and getgrgid(3) for the names.