Путеводитель по Руководству Linux

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   recvmsg    ( 2 )

получить сообщение от сокета (receive a message from a socket)

  Name  |  Synopsis  |  Description  |    Return value    |  Error  |  Conforming to  |  Note  |  Examples  |  See also  |

Возвращаемое значение (Return value)

These calls return the number of bytes received, or -1 if an error occurred. In the event of an error, errno is set to indicate the error.

When a stream socket peer has performed an orderly shutdown, the return value will be 0 (the traditional "end-of-file" return).

Datagram sockets in various domains (e.g., the UNIX and Internet domains) permit zero-length datagrams. When such a datagram is received, the return value is 0.

The value 0 may also be returned if the requested number of bytes to receive from a stream socket was 0.