/* defines */
#ifndef _PATH_LOG
#ifdef BSD
#define _PATH_LOG       "/var/run/log"
#else
#define _PATH_LOG       "/dev/log"
#endif
#endif
#ifndef SYSTEMD_JOURNAL
#define SYSTEMD_JOURNAL  "/run/systemd/journal"
#endif
#ifndef SYSTEMD_PATH_LOG
#define SYSTEMD_PATH_LOG SYSTEMD_JOURNAL "/syslog"
#endif
...
/* activate current listeners */
static inline rsRetVal
activateListeners()
{
...
                listeners[0].sockName = UCHAR_CONSTANT(_PATH_LOG);
                if(runModConf->pLogSockName != NULL)
                        listeners[0].sockName = runModConf->pLogSockName;
                else if(sd_booted()) {
                        struct stat st;
                        if(stat(SYSTEMD_PATH_LOG, &st) != -1 && S_ISSOCK(st.st_mode)) {
                                listeners[0].sockName = (uchar*) SYSTEMD_PATH_LOG;
                        }
                }