Matthew Leach <matthew@mattleach.net> schrieb am So., 27. März 2016 um
17:17 Uhr:

> >> +#ifdef HAVE_SYSTEMD
> >> +      /* Read the number of sockets passed through by systemd. */
> >> +      systemd_socket = sd_listen_fds(0);
> >
> > Isn't it prudent to test the socket descriptor for validity?  What if
> > it isn't a socket, for example?
>
> Agreed.  I'm thinking about trying getsockname as a test for validity as
> this should also ensure that the socket is already bound.
>

The systemd library has some helper functions for that:
https://www.freedesktop.org/software/systemd/man/sd_is_fifo.html