kernel-devel/char-device/example/user/huhu.c


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#include <stdio.h>
#include <stdlib.h>
#include <errno.h>

int main (int argc, char **argv)
{
	int ret = 0;
	FILE *fp;

	fp = fopen ("/dev/huhu", "r+");
	if (!fp)
	{
		perror ("open /dev/huhu failed");
		ret = errno;
		goto out;
	}

	system ("/bin/lsmod | grep huhu");

	ret = fclose (fp);
	if (ret)
	{
		perror ("close /dev/huhu failed");
		goto out;
	}
out:
	return ret;
}