Practical usage of setjmp and longjmp in C

Question

Can anyone explain me where exactly setjmp() and longjmp() functions can be used practically in embedded programming? I know that these are for err

Answer 1

Hands down, the most crucial use of setjmp/longjmp is that it acts a "non-local goto jump". Goto command (and there rare instances where you will need to use goto over for and while loops) is most-used-safely in the same scope. If you use goto to jump across scopes (or across auto allocation), you will most-likely corrupt your program's stack. setjmp/longjmp avoids this by saving the stack info at the location you want to jump to. Then, when you jump, it loads this stack info. Without this feature, C programmers would most likely had to turn to assembly programming to solve issues that only setjmp/longjmp could solve. Thank God it exists. Everything in the C library is extremely important. You will know when you need it.