This violates POSIX but POSIX is stupid in this respect. Of course, this
will ever so subtly break some applications. Not sure how this stupid design
can be fixed without breaking backwards compatibility. Perhaps remove the
putenv(3) function and replace it with a better replacement? (Or perhaps you
should just use setenv(3) anyways..)
unsetenv(3), envlength(3), getenvindexed(3), and environ(7).
This provides the user-space foundation for environmental variables.
Note that this works over fork(2), but not execve(2) yet.
