/* * RTLinux scheduling accuracy measuring example, user program * * (C) Michael Barabanov, 1997 *  (C) FSMLabs  1999. baraban@fsmlabs.com *  Released under the GNU GENERAL PUBLIC LICENSE Version 2, June 1991 *  Any use of this code must include this notice. */#include <stdio.h>#include <errno.h>#include <stdlib.h>#include <sys/time.h>#include <sys/types.h>#include <fcntl.h>#include <unistd.h>#include <sys/ioctl.h>#include <rtl_fifo.h>#include "common.h"int main(int argc,char ** argv){	int fd0;	int n;	int samples=1000;	struct sample samp;  	while (--argc > 0 && (*++argv)[0] == '-') {		switch ((*argv)[1]) {		case 's':			if (--argc <= 0){				printf("-s needs a number of samples\n");				return -1;				}      			samples = atoi(*++argv);			break;		default:			printf("./monitor [-s NUM_SAMPLES]\n");			break;		}	}		if ((fd0 = open("/dev/rtf0", O_RDONLY)) < 0) {		fprintf(stderr, "Error opening /dev/rtf0\n");		exit(1);	}	while(samples--){		n = read(fd0, &samp, sizeof(samp));		printf("min: %8d, max: %8d\n", (int) samp.min, (int) samp.max);		fflush(stdout);	}	return 0;}