BIO_free_all does just what it says: it frees the internal structure and releases all associated memory, including closing the associated socket.

BIO_free_all所做正如其所言：它释放内部结构体，并释放所有相关联的内存，其中包括关闭相关联的套接字。

youdao

A message sent on a datagram socket was larger than the internal message buffer or some other network limit, or the buffer used to receive a datagram into was smaller than the datagram itself.

一个在数据报套接字上发送的消息大于内部消息缓冲器或其他一些网络限制，或该用户用于接收数据报的缓冲器比数据报小。

youdao

Said electric gang socket has annular electrodes and bottom contacts on its internal side wall and bottom of its recess.

旋转电连接头在柱状接头的头端面和外表面分别设有环状电极片和侧弹触片。

youdao

The Logitech, Bose and Geneva Sound units all have internal batteries, so you can run them for a few hours without the need for a wall socket.

WSJ: Bluetooth Speakers: The Untethered Sound System