advanced patterns with `setjmp` and `longjmp` in C - Variable Scope Confusion
I've encountered a strange issue with I tried several approaches but none seem to work... Hey everyone, I'm running into an issue that's driving me crazy. I'm experiencing unexpected behavior when using `setjmp` and `longjmp` in my C application, particularly regarding variable scope and initialization. I've implemented a simple behavior handling mechanism where I use `setjmp` to save the execution context and `longjmp` to jump back to that context when an behavior occurs. However, I'm noticing that local variables within the function where `setjmp` is called are not retaining their values after a jump back. Here’s a simplified version of my code: ```c #include <stdio.h> #include <setjmp.h> jmp_buf buffer; void function() { int value = 5; if (setjmp(buffer) != 0) { printf("Jumped back: value = %d\n", value); return; } value += 10; // Simulating an behavior longjmp(buffer, 1); } int main() { function(); return 0; } ``` When I run this code, I expect to see `"Jumped back: value = 15"`, but instead, I see `"Jumped back: value = 5"`. I understand that `setjmp` saves the stack context, but it seems like the variable `value` is re-initialized every time I call `function()`. I've tried moving the declaration of `value` outside of the function to make it static, but that didn't work either. Could someone provide insight into how variable scope works with `setjmp` and `longjmp`? What am I missing here? I'm working on a CLI tool that needs to handle this. I'd really appreciate any guidance on this. Is there a better approach? Is there a better approach?