我已经找到了答案。这个问题不应该被删除。作为一项规则只有系统调用这是慢返回EINTR。慢事情终端I / O和东西等待（选择，等待，睡眠，暂停等）。

I have found the answer. This question should not have been deleted. As a rule only syscalls which are "slow" return EINTR. Slow things are terminal I/O and things which wait (select, wait, sleep, pause, etc).