Use of "Listen" in Socket Server in C++ Using Linux -

Use of "Listen" in Socket Server in C++ Using Linux -

in socket server code, written that:

listen (socket_fd, 5);

i know written here reason of "listening connection" not sure parameter 5 means. there syntax

socklen_t

i tried find using manual command unable.

from this site, sec parameter backlog queue size. listen(int fd, int size) function creates queue incoming connection requests. in illustration able handle 5 connection attempts arrive @ (or close to) same time.

c++ sockets socketserver