#include <stdio.h>
#include <stdlib.h>
#include <fcntl.h>
#include <signal.h>
#include <errno.h>
#include <string.h>

void sigint(int sig)
{
	fprintf(stderr, "Keyboard Interrupt\n");
	return;
}

int main(int argc, char **argv)
{
	int fd;
	int32_t target = 0;
	int ret;

	if ((fd = open("/dev/cpu_dma_latency", O_WRONLY)) == -1) {
		fprintf(stderr, "Failed to open /dev/cpu_dma_latency: %s\n", strerror(errno));
		exit(-1);
	}

	if ((ret = write(fd, &target, sizeof(target))) <= 0) {
		fprintf(stderr, "Failed to write zero to /dev/cpu_dma_latency: %s\n", strerror(errno));
		exit(-2);
	}
	signal(SIGINT, sigint);
	printf("pausing with /dev/cpu_dma_latency open\n");
	pause();
	printf("closing /dev/cpu_dma_latency\n");
	close(fd);
	exit(0);
}