openlog() library call. If the library call is successful,
it runs at_halt(closelog) to ensure closing the system log on
clean exit.
| 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. |