recv() socket function returning data with length as 0

Question

I am having an application which established a socket connection on a port number 5005 with another device(hardware device with a web server).

Now if my hardware de

Answer 1

I suppose you're using TCP to communicate with your device.

1. The socket itself is still "valid", however the the connection was lost.

2. You get a return value of 0 for recv() when the connection was closed by the other host (wether this disconnection was graceful or not doesn't matter)

3. socket functions are like C functions: they don't throw because they can be used in C programs, where exceptions do not exist.