□ setresuid/setresgid : SET R(eal), E(ffective), S(aved) UID/GID
□ It changes permission of currently active processes.
□ man page : http://linux.die.net/man/2/setresuid
Also posted at : http://cysecguide.blogspot.com/2016/08/function-setresuidsetresgid.html
