maybe this thread should be moevd to programming forum, but if I started this here I wont start another thread for the same pbroblem.
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What am I missing?
What needs to be added to receive SIGINT from serial driver?

#include <termios.h>
#include <stdio.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/signal.h>
#include <sys/types.h>
#include <sys/ioctl.h>
#define BAUDRATE B38400
#define MODEMDEVICE "/dev/ttyS0"
#define _POSIX_SOURCE 1 /* POSIX compliant source */
#include <unistd.h>
#include <errno.h>
#include <string.h>
void signal_handler_SIGINT (int status); /* definition of signal handler */

main()
{
int fd,c, res;
struct termios options;
char buf[255];
int pid;

fd = open(MODEMDEVICE, O_RDWR | O_NOCTTY | O_NONBLOCK);
if (fd <0) {perror(MODEMDEVICE); exit(-1); }

signal(SIGINT,signal_handler_SIGINT);

fcntl(fd, F_SETOWN, getpid());
/* Make the file descriptor asynchronous (the manual page says only
O_APPEND and O_NONBLOCK, will work with F_SETFL...) */
fcntl(fd, F_SETFL, FASYNC);

memset (&options, 0x00, sizeof (options));
options.c_cflag |= (CREAD);
options.c_cflag |= CLOCAL;
options.c_cflag |= CS8; // Select 8 l2_data bits
options.c_iflag |= (BRKINT);
// options.c_cc[VMIN] = 1;
options.c_cc[VTIME] = 1;
if(ioctl(fd,TIOCSCTTY, 1) == -1)
printf("eh %s\n",strerror(errno));

}

/***************************************************************************
* signal handler. sets wait_flag to FALSE, to indicate above loop that *
* characters have been received. *
***************************************************************************/

void signal_handler_SIGINT (int status)
{
printf("received SIGINT signal.\n");
exit(0);
}