A blocking syscall, like a read will only return once data is available.

阻塞的系统调用，就拿读取来说，直到数据准备好的时候才会返回。

youdao

EWOULDBLOCK is returned when no data is available without blocking.

EWOULDBLOCK在不阻塞的情况下返回当没有数据可用。

youdao

EWOULDBLOCK is returned when no data is available without blocking.

EWOULDBLOCK在不阻塞的情况下返回当没有数据可用。

youdao