Receives the data from a connected socket.
- Parameters
-
| s | Descriptor identifying a connected socket. |
| buf | Buffer for the incoming data. |
| len | Length of the buf. |
| flags | Optional flag specifying the way, in which the call is made. It can be constructed by using the bitwise OR operator with any of the values defined by the fnet_msg_flags_t. |
- Returns
- This function returns:
- The number of bytes received, if no error occurs. The return value is set to zero, if there is no input data.
- FNET_ERR if an error occurs.
The specific error code can be retrieved using the fnet_error_get().
- See also
- fnet_socket_connect(), fnet_socket_recvfrom()
For connection-oriented sockets (SOCK_STREAM), calling the fnet_socket_recv() will return as much information as is currently available up to the size of the buffer supplied.
For connectionless sockets (SOCK_DGRAM), the data is extracted from the first enqueued datagram (message), whose destination address is specified by the fnet_socket_connect() function. If the datagram is larger than the supplied buffer, the buffer is filled with the first part of the datagram, and the fnet_socket_recv() generates the error FNET_ERR_MSGSIZE and the excess data is lost.
The flags parameter can be used to influence the behavior of the function invocation beyond the options specified for the associated socket.
