Ask about the purpose and meaning of some code about webbench HOT 1 OPEN

This was the first project I studied, probably because of my limited ability, and I found that some places were not well understood. The following three points are some of my questions. Thank you for your guidance.

(1) Why isn't pid < 3 here? Is there any special meaning for pid being 2?

WebBench/webbench.c

Lines 411 to 416 in b1acf3c

	pid=fscanf(f,"%d %d %d",&i,&j,&k);
	if(pid<2)
	{
	fprintf(stderr,"Some of our childrens died.\n");
	break;
	}

(2) Why does the bench() function return i? Isn't this the speed value that the parent process successfully read the last time? Could I change the program to return 0?

WebBench/webbench.c

Line 435 in b1acf3c

return i;

(3) Add close(sock); is it more rigorous?

WebBench/socket.c

Lines 54 to 55 in b1acf3c

	if (connect(sock, (struct sockaddr *)&ad, sizeof(ad)) < 0)
	return -1;

My personal opinion：
(1): Because in common Linux operating systems, the PID of 0 and 1 have been occupied by the process operating system and the software which cooperates with the operating system.

(2): Currently, I'm facing the same problem with you, and I think you are true.

(3): Use man 3 connect, and I have found this sentenceAPPLICATION USAGE: If connect() fails, the state of the socket is unspecified. Conforming applications should close the file descriptor and create a new socket before attempting to reconnect. So I agree with you.

from webbench.