apps/examples/module: Now exercises rmmod as well

examples/module/drivers/chardev/.gitignore

@@ -1,2 +1,2 @@
-hello
+/chardev
 

examples/module/drivers/chardev/chardev.c

@@ -46,6 +46,7 @@
 #include <syslog.h>
 #include <debug.h>
 
+#include <nuttx/module.h>
 #include <nuttx/fs/fs.h>
 
 /****************************************************************************
@@ -124,6 +125,18 @@ static ssize_t chardev_write(FAR struct file *filep, FAR const char *buffer,
   return len;
 }
 
+/****************************************************************************
+ * Name: module_uninitialize
+ ****************************************************************************/
+
+static int module_uninitialize(FAR void *arg)
+{
+  /* TODO: Check if there are any open references to the driver */
+
+  syslog(LOG_INFO, "module_uninitialize: arg=%p\n", arg);
+  return register_driver("/dev/chardev", &chardev_fops, 0666, NULL);
+}
+
 /****************************************************************************
  * Public Functions
  ****************************************************************************/
@@ -136,7 +149,14 @@ static ssize_t chardev_write(FAR struct file *filep, FAR const char *buffer,
  *
  ****************************************************************************/
 
-void module_initialize(void)
+void module_initialize(mod_uninitializer_t *uninitializer, FAR void **arg)
 {
-  (void)register_driver("/dev/chardev", &chardev_fops, 0666, NULL);
+  int ret;
+
+  syslog(LOG_INFO, "module_initialize:\n");
+
+  *uninitializer = module_uninitialize;
+  *arg = NULL;
+
+  return register_driver("/dev/chardev", &chardev_fops, 0666, NULL);
 }

examples/module/module_main.c

@@ -205,5 +205,12 @@ int module_main(int argc, char *argv[])
   lib_dumpbuffer("Bytes read", (FAR const uint8_t *)g_write_string, nbytes);
 
   close(fd);
+  ret = rmmod(&module);
+  if (ret < 0)
+    {
+      fprintf(stderr, "ERROR: rmmod failed: %d\n", ret);
+      exit(EXIT_FAILURE);
+    }
+
   return EXIT_SUCCESS;
 }