func NewSyslogBackend(prefix string) (b *SyslogBackend, err error) {
	var w *syslog.Writer
	w, err = syslog.New(syslog.LOG_CRIT, prefix)
	return &SyslogBackend{w}, err
}
func NewSyslogBackend(prefix string) (b *SyslogBackend, err error) {
	var w *syslog.Writer
	w, err = syslog.New(syslog.LOG_CRIT, prefix)
	return &SyslogBackend{w}, err
}
// NewSyslogBackend connects to the syslog daemon using UNIX sockets with the
// given prefix. If prefix is not given, the prefix will be derived from the
// launched command.