Migrating from FreeBSD to LInux (several utilities) rewrite or ...?

Question

linux

So, thanks for your attention. I myself help and advise in any way I can, and now I have a question.
I am dragging on Linux software for service terminals, which has been written for a long time, under Fryahu 8.3. Everything is rotten there, but it’s good that they wrote in python and systematically pull this nightmare out to stable 2.7 (there can be no more talk about a three-ruble note, and the budget is not the same) and there are two utilities that are launched by subprocesses. Written in bare C with reference to friashny nuclear realities, it’s not the first time I’m already stepping into this and now I’m thinking, maybe rewrite it again or is there some level of abstraction to compile it and give it to the customer (yeah, what else would it be and worked).
Well, the last question, how much do you think this level of perversion (rewriting unknown crap) costs?

Answer 1

Written in bare C with reference to fancy nuclear realities

In more detail, what are the "nuclear realities"?
If these are system calls (and what other "nuclear realities" can be from userspace programs?), then everything is POSIX-close there;) ... there should be analogies, or differences in parameters only.
I would decide this based on the hourly rate of actual time spent.

Answer 2

"nuclear realities" is a binding to .h of the kernel. There is monitoring of com and lpt ports, as I understand it. Now I'm lighting up and I don't see any similar bindings.