[cs631apue] getprogname and setprogname

[Nick Smith]

In the code style guide, there is a note to use getprogname(3) and 
setprogname(3) to get/set the name of the executable for compatibility 
on some systems. I've tried including this in my code and haven't been 
able to include the definitions on my GNU/Linux system or on the linux-lab.

I believe this is a part of stdlib, but may not be implemented on GNU 
systems. Has anyone been able to include this definition, or is there 
some shim available for systems which do not implement it?

Thanks,
Nick S