I need some help with C programming in Linux

Hello, I am using some functions that on error se some value to the errno variable, but I don't know how I can get the value of this variable. thanks.-

>>19
True. Most things a language provides have their use, and you can abuse every single feature. You shouldn't avoid things that could be abused or failed; you should be learn to use the right tool for every time and tell when something is a good or a bad idea.