display.c

rtai-3.1-test3的源代码(Real-Time Application Interface )

/*
 * COPYRIGHT (C) 2001  Paolo Mantegazza <[e-mail]>
 *               2002  Robert Schwebel  <[e-mail]>
 * 
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 * 
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA.
 * 
 */

#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <sys/time.h>
#include <sys/types.h>
#include <fcntl.h>
#include <signal.h>
#include <time.h>
#include <unistd.h>
#include <sys/ioctl.h>

#include <rtai_fifos.h>

static int end;

static void endme(int dummy) { end = 1;}

int main(int argc, char *argv[])
{
	int fd0;
	char line[256];
	char nm[RTF_NAMELEN+1];
	FILE *procfile;
	time_t timestamp;
	struct tm *tm_timestamp;
	struct sample { long long min; long long max; int index; } samp;

	signal(SIGINT, endme);

	if ((procfile = fopen("/proc/rtai/latency_calibrate", "r")) == NULL) {
		printf("Warning: Error opening /proc/rtai/latency_calibrate\n");
		printf("         Couldn't get infos about the module's state.\n");
	} else {
		while (fgets(line,256,procfile) != NULL) {printf("%s",line);}
		fclose(procfile);
	}

	if ((fd0 = open(rtf_getfifobyminor(3,nm,sizeof(nm)), O_RDONLY)) < 0) {
		fprintf(stderr, "Error opening %s\n",nm);
		exit(1);
	}


	while (!end) {
		read(fd0, &samp, sizeof(samp));
		time(&timestamp); 
		tm_timestamp=localtime(&timestamp);
		printf("%04d/%02d/%0d %02d:%02d:%02d   ", 
			tm_timestamp->tm_year+1900, tm_timestamp->tm_mon+1, tm_timestamp->tm_mday,
		 	tm_timestamp->tm_hour, tm_timestamp->tm_min, tm_timestamp->tm_sec	
		);
		printf("min: %8d    max: %8d    average: %8d\n", (int) samp.min, (int) samp.max, samp.index);
		fflush(stdout);
	}

	close(fd0);

	return 0;
}