What does read in C return?

The read() function reads data previously written to a file. If any portion of a regular file prior to the end-of-file has not been written, read() shall return bytes with value 0. For example, lseek() allows the file offset to be set beyond the end of existing data in the file.

What does the command read () do in socket programming?

In control-data mode, read() converts any control part to data and passes it to the application before passing any data part originally present in the same message. In control-discard mode, read() discards message control parts but returns to the process any data part in the message.

What is receive function?

Remarks. The recv function is used to read incoming data on connection-oriented sockets, or connectionless sockets. When using a connection-oriented protocol, the sockets must be connected before calling recv. When using a connectionless protocol, the sockets must be bound before calling recv.

What is the difference between RECV and Recvfrom?

The recv() function is normally used only on a connected socket (see connect) and is identical to recvfrom() with a null pointer passed as its from argument. If a message is too long to fit in the supplied buffer, excess bytes may be discarded depending on the type of socket the message is received from (see socket).

What’s the difference between recv and read in socket programming?

What is the difference between read () and recv (), and between send () and write () in socket programming in terms of performances, speed and other behaviors? The difference is that recv () / send () work only on socket descriptors and let you specify certain options for the actual operation.

Is there a way to call receive from a socket?

The Socket has been closed. A caller in the call stack does not have the required permissions. The Receive method reads data into the buffer parameter and returns the number of bytes successfully read. You can call Receive from both connection-oriented and connectionless sockets. This overload only requires you to provide a receive buffer.

What are the values in socket.receive method?

An array of type Byte that is the storage location for received data. The location in buffer to store the received data. The number of bytes to receive. A bitwise combination of the SocketFlags values. The number of bytes received. buffer is null. offset is less than 0. offset is greater than the length of buffer. size is less than 0.

What’s the difference between a socket and a stream?

Yet a socket is only a real stream if it uses TCP. If it uses UDP it’s more like a block device. But if both sides use it like a stream, it will work like a stream and you cannot even send an empty UDP packet using write calls, so this situation won’t arise. – Mecki Sep 20 ’18 at 15:31 read () is equivalent to recv () with a flags parameter of 0.