fchmod()

Instead of chmod(), use fchmod() whenever possible

Open file for reading
use fchmod()
close file

fchown() and fchmod() are not necessary when you are in a directory where
You are the only one with write permission, or
The sticky bit is set

Of course, it's always better to be safe than sorry
What if the file permissions of the dir change?
What if you use this code in a directory that isn't sticky/etc?