list macro in C

Interesting in C is that the link is implemented inside structure rather than the structure itself became a part of the list. Feels like each item is dangling on each node. Not used to macro functions in C, but found out they are handy to use.

struct list_head {
  struct list_head *prev, *next;
}

struct task_head {
  pid_t pid;
  struct lsit_head list;
}