#include <syslog.h>
#include <stdio.h>
#include <unistd.h>

int main()
{
    int logmask;

    openlog("logmask", LOG_PID|LOG_CONS, LOG_USER);
    syslog(LOG_INFO,"informative message, pid = %d", getpid());
    syslog(LOG_DEBUG,"debug message, should appear");
    logmask = setlogmask(LOG_UPTO(LOG_NOTICE));
    syslog(LOG_DEBUG,"debug message, should not appear");
    exit(0);
}