program in loop doesn't work

[Trootyl]

At first I would like to say thank you, great job.

Unfortunately, I have a problem with your code. When I use it in a loop, the program creates a new process for the socket each time. After a few times the program hangs and crashes a thread in my program that works with this code. I even tried to use the close () and socket() + close() outside loop functions (crashes too). The program crashes after a few passes of the loop (sometimes at beginning, not always at the same time). I tried to debug the code (with prinf() before and after every functions) and the program crashes at different times. Sometimes read, sometimes write. Maybe you have an idea how to solve it?

[Trootyl]

Ok, I debuged this code. In write() you sent 27 (0x1B). When you read() you should receive 28 (0x1C) in 1st byte.
But when I have error I read 220 (DC) in 1st byte. The problem is in reading. When I have bad 1st byte, program goes to sleep (do nothing), but never ends.

There is output.

Can you help me with this?

[Trootyl]

If somebody need helps:

fcntl( sockfd, F_SETFL, O_NONBLOCK );
and select() function helps me to unblock socket and handle errors.