Is there a good reason to write my own daemonize function instead of using daemon(3)?

Question

There are a lot of example implementations of daemons on the net. Most that I saw do not use the daemon(3) function to run the program in the background. Is that just a matt

Answer 1

The BSD daemon() function is very limited and invites misuse. Only very few daemons may use this function correctly.

The systemd man pages have a list of what a correctly written SysV daemon should do when daemonizing:

http://0pointer.de/public/systemd-man/daemon.html