underscore R

[worker201]

While watching the screen output when I run a configure script, I have seen some kinda weird things. It will check for 'getenv', then it will check for 'getenv_r'. Also, I have seen 'localtime_r', 'putenv_r', 'strerror_r', and numerous others.

What are these? What is the difference between these and the normal versions? Are these part of glibc? Where can I get them if I don't have them?

[Void Main]

It looks to be "thread safe" versions of their counterpart functions:

man localtime_r