This API supports logging by daemons, either to syslog or
to the console. It is modelled after the API provided by the
err(3) family of functions.
By default logging is output to the console via the err(3) API.
However, if the daemon forks, the same API can be directed to syslog.
lerr(), lerrx(), lwarn(), and lwarnx() are equivalent to
err(), errx(), warn(), and warnx() respectively.
linfo() and ldebug() can be used to log information at the
LOG_INFO and LOG_DEBUG log levels in the syslog() backend.
warnx() is used as the backend for these functions in console
logger.
logger_syslog() is used to switch the logger from console output
to syslog output. Internally it passes the progname argument as
the ident argument to openlog(3).
if (!debug) {
logger_syslog(getprogname());
}
linfo("program has started");