recvfrom
- 网络接收数据
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。
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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。