syslog example

syslog.c

#include <stdarg.h>
#include <stdlib.h>
#include <syslog.h>

void log_err(const char *format, ...)
{
        va_list ap;
        va_start(ap, format);
        syslog(LOG_ERR, format, ap);
        va_end(ap);
}

int main()
{
        extern const char *__progname;

        openlog(__progname, LOG_PID, LOG_USER);

        syslog(LOG_WARNING, "Hi from example application");
        syslog(LOG_INFO, "I can Haz Numbers, %d", 12);
        log_err("Critical error");

        closelog();

        return EXIT_SUCCESS;
}