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gas_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 GAS_MAJOR_NUMBER	505
+#define GAS_MINOR_NUMBER 	100
+#define GAS_DEV_PATH_NAME 	"/dev/gas_ioctl"
+
+#define IOCTL_MAGIC_NUMBER		'g'
+#define IOCTL_CMD_GAS_ON					_IO(IOCTL_MAGIC_NUMBER, 0)
+#define IOCTL_CMD_GAS_OFF					_IO(IOCTL_MAGIC_NUMBER, 1)
+
+int main(void) {
+	dev_t gas_dev;
+	int fd;
+	gas_dev = makedev(GAS_MAJOR_NUMBER, GAS_MINOR_NUMBER);
+	mknod(GAS_DEV_PATH_NAME, S_IFCHR | 0666, gas_dev);
+
+
+	fd = open(GAS_DEV_PATH_NAME, O_RDWR);
+
+	if (fd < 0) {
+		printf("fail to open gas\n");
+		return -1;
+	}
+
+	int i = 0;
+
+	while (i < 100) {
+		if (ioctl(fd, IOCTL_CMD_GAS_ON, 0) == 0) {
+			printf("gas on\n");
+			sleep(1);
+			i++;
+		}
+		else
+			printf("no gas\n");
+		sleep(1);
+		i++;
+	}
+
+	close(fd);
+	return 0;
+}