Does it read from a socket or receive EOF?

Question

I implement a simple connection between a client and a server in C. On the client side, I am in a loop, reading from a file; each time BUFFER_SIZE bytes and sending them to the server (do not load error handling).

//client side
bytesNumInput = read(inputFileFD,bufInput,BUFFER_SIZE)
bytesSend = write(sockfd,bufInput,bytesNumInput)

Of course, the server is also in a loop.

//server side
bytesRecv = read(sockfd,bufOutput,bytesNumInput)

Now my questions are:

• Is it possible to get EOF in the middle of a connection if the server is reading faster than the client?
• Does the read function expect to receive all the data, or is it the same as reading from a file?
• Is it possible that the server will handle 2 read iterations in 1 write iteration?

Answer 1

• No, the server will wait for incoming data. Sockets provide a flow of control.
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Answer 2

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