Intrusive verkettete Listen mittels offsetof und container_of

#include <stdio.h>
#include <stddef.h>
 
#define container_of(ptr, type, member) \
    ((type *)((char *)(ptr) - offsetof(type, member)))
 
struct list_node {
    struct list_node *next;
};
 
struct task {
    int priority;
    const char *name;
    struct list_node node;
};
 
int main(void) {
    struct task t1 = { .priority = 1, .name = "Cleanup", .node = { NULL } };
    struct list_node *node_ptr = &t1.node;
 
    struct task *recovered_task = container_of(node_ptr, struct task, node);
    printf("Task Name: %s, Priority: %d\n", recovered_task->name, recovered_task->priority);
 
    return 0;
}