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buzzer_app.c

+#include <stdio.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <stdlib.h>
+
+#include <sys/stat.h>
+#include <sys/ioctl.h>
+#include <sys/types.h>
+#include <sys/ioctl.h>
+#include <sys/sysmacros.h>
+
+#define BUZZER_MAJOR_NUMBER	502
+#define BUZZER_MINOR_NUMBER 100
+#define BUZZER_DEV_PATH_NAME 	"/dev/buzzer_ioctl"
+
+#define IOCTL_MAGIC_NUMBER		'k'
+#define IOCTL_CMD_BUZZER_OFF	_IO(IOCTL_MAGIC_NUMBER, 0)
+#define IOCTL_CMD_BUZZER_ON		_IO(IOCTL_MAGIC_NUMBER, 1)
+
+int main(void) {
+	dev_t buzzer_dev;
+	int fd;
+	buzzer_dev = makedev(BUZZER_MAJOR_NUMBER, BUZZER_MINOR_NUMBER);
+	mknod(BUZZER_DEV_PATH_NAME, S_IFCHR | 0666, buzzer_dev);
+
+	fd = open(BUZZER_DEV_PATH_NAME, O_RDWR);
+
+	if (fd < 0) {
+		printf("fail to open buzzer\n");
+		return -1;
+	}
+
+
+
+	ioctl(fd, IOCTL_CMD_BUZZER_ON, 0);
+	sleep(2);
+
+	ioctl(fd, IOCTL_CMD_BUZZER_OFF, 0);
+	sleep(2);
+
+	ioctl(fd, IOCTL_CMD_BUZZER_ON, 0);
+	sleep(2);
+
+	ioctl(fd, IOCTL_CMD_BUZZER_OFF, 0);
+	sleep(2);
+
+
+	close(fd);
+	return 0;
+}