Hi, I have a few questions about the socket library in C. Here is a snippet of code I'll refer to in my questions.

char recv_buffer[3000];
recv(socket, recv_buffer, 3000, 0);

First, How do I decide how big to make recv_buffer? I'm using 3000, but it's arbitrary. Second, what happens if recv() receives a packet bigger than my recv_buffer? Third, how can I know if I have received the entire message without calling recv again and have it wait forever when there is nothing to be received?

And finally, is there a way I can make a buffer not have a fixed amount of space, so that I can keep adding to it without fear of running out of space? maybe using strcat to concatenate the latest recv() response to the buffer?

I know it's a lot of questions in one, but I would greatly appreciate any responses.