syslog:openlog/3

ext
- clib

openlog(+Ident:atom, +Options:list(atom), +Facility:atom) is det

Open system log. This predicate provides a direct interface into the openlog() library call. If the library call is successful, it runs at_halt(closelog) to ensure closing the system log on clean exit.

Arguments:

`Ident`	- prepended to every message, and is typically set to the program name.
`Options`	- is a list of options. Values are corresponding C options, after removing =LOG_= and translation to lower case: `cons`, `ndelay`, `nowait`, `odelay`, `perror`, `pid`.
`Facility`	- is one of `auth`, `authpriv`, `cron`, `daemon`, `ftp`, `kern`, `local0` ... `local7`, `lpr`, `mail`, `news`, `syslog`, `user` or `uucp`.