慢慢欣赏linux 进程的领头线程 领头进程 领头会话

SYSCALL_DEFINE0(getpid)
    return task_tgid_vnr(current);
    =>static inline pid_t task_tgid_vnr(struct task_struct *tsk)
        return pid_vnr(task_tgid(tsk));
            =>static inline struct pid *task_tgid(struct task_struct *task)
                return task->group_leader->pids[PIDTYPE_PID].pid;
                
                
轻松理解 struct pid
https://blog.youkuaiyun.com/lovelycheng/article/details/78359945