Character driver finished

character_driver/app_test.c

@@ -0,0 +1,27 @@
+#include <stdio.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <string.h>
+#include <stdlib.h>
+#include <sys/types.h>
+#include <errno.h>
+
+int main(){
+
+    int fd, i;
+    ssize_t ret;
+    char my_buf[12] = "Hello world";
+
+    fd = open( "/dev/demo_cdrv", O_RDWR);
+    if(fd < 0){
+        printf("failed acquiring file descriptor return status %d\n", fd);
+    }
+
+    /* Write the contents of my buffer into the device */
+    ret = write(fd, my_buf, 8);
+    ret = read(fd, my_buf, 12);
+    if( ret < 0 )
+        printf("read operation failed with return status %d\n", ret);
+    close(fd);
+    return 0;
+}