Qt syslog logger

syslog_logger.h

#include <QString>
#include <QDebug>
#include <QCoreApplication>
#include <QFileInfo>
#include <syslog.h>

void syslogMessageHandler(QtMsgType type, const QMessageLogContext & context, const QString & clean) {

#ifdef APP_NAME
    const char * app_name = APP_NAME;
#else
    const char * app_name = QFileInfo( QCoreApplication::applicationFilePath() ).fileName().toLatin1().data();
#endif
    openlog(app_name, (LOG_CONS|LOG_PERROR|LOG_PID), LOG_DAEMON);
    int log_flag;
    switch (type) {
        case QtDebugMsg:
            log_flag = LOG_DEBUG;
            break;
        case QtInfoMsg:
            log_flag = LOG_INFO;
            break;
        case QtWarningMsg:
            log_flag = LOG_WARNING;
            break;
        case QtCriticalMsg:
            log_flag = LOG_CRIT;
            break;
        case QtFatalMsg:
            log_flag = LOG_ERR;
            break;
    }
    if (!clean.isEmpty()) {
        syslog(log_flag, "%s", qPrintable(clean));
    }
    closelog();
    if (log_flag == LOG_ERR) {
        abort();
    }
}