There are HN readers besides myself, not to mention hundreds if not thousands of others, who use various programs that use this function, such as

https://cr.yp.to/ucspi-tcp/install.html

https://cr.yp.to/daemontools/install.html

https://cr.yp.to/djbdns/install.html

https://cr.yp.to/clockspeed.html

https://cr.yp.to/software/qmail-1.03.tar.gz

https://smarden.org/runit/install.html