Comment by shakna

Attributes, mostly. Which have become so common that defer is very likely to be in the next C standard. [0]

    bool function_with_cleanup(void) {
        // Allocate first resource
        int* buffer1 __attribute__((__cleanup__(free))) =  malloc(sizeof(int) * 100);
        if(!buffer1) { return false; }

        // Allocate second resource
        int* buffer2 __attribute__((__cleanup__(free))) = malloc(sizeof(int) * 200);
        if(!buffer2) { return false; }

        // Open a file
        FILE* file __attribute__((__cleanup__(fclose))) = fopen("data.txt", "r");
        if (!file) { return false; }

        return true;
    }

[0] https://thephd.dev/c2y-the-defer-technical-specification-its...