why select() always return 0 after the first timeout

Question

I have a problem about select function when I worked on a Linux socket program. The select function worked fine as the man page says if the client connected the server side

Answer 1

I've got the same trouble in my similar codes. I followed the suggestion of doing initialization each time before calling select() and it works. In codes at this case, just bringing the two lines into loop will make it work.

FD_ZERO(&read_set);
FD_SET(servSock, &read_set);