recvfrom

There are four system calls that can be used to receive data from a connection: read, readv, recvfrom, and recvmsg.

有四个系统调用可以用于从连接接收数据：read、readv、recvfrom和recvmsg。

While recv (a library function used by the process), recvfrom, and recvmsg operate only on socket descriptor, read and readv can operate on any kind of descriptor.

尽管recv(进程使用的库函数)、recvfrom和recvmsg仅可以对套接字描述符操作，但read和readv可以对任何种类的描述符操作。