Add basic module management logic

git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@1894 42af7a65-404d-4744-a932-0658087f49c3

1 files changed, 130 insertions, 0 deletions

diff --git a/nuttx/binfmt/binfmt_unregister.c b/nuttx/binfmt/binfmt_unregister.c
new file mode 100644
index 000000000..1eedffcfc
--- /dev/null
+++ b/nuttx/binfmt/binfmt_unregister.c
@@ -0,0 +1,130 @@
+/****************************************************************************
+ * binfmt/binfmt_unregister.c
+ *
+ *   Copyright (C) 2009 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <spudmonkey@racsa.co.cr>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+#include <sys/types.h>
+
+#include <string.h>
+#include <sched.h>
+#include <debug.h>
+#include <errno.h>
+
+#include <nuttx/binfmt.h>
+
+#include "binfmt_internal.h"
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Function Prototypes
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Data
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/***********************************************************************
+ * Public Functions
+ ***********************************************************************/
+
+/***********************************************************************
+ * Name: unregister_binfmt
+ *
+ * Description:
+ *   Register a loader for a binary format
+ *
+ ***********************************************************************/
+
+int unregister_binfmt(FAR struct binfmt_s *binfmt)
+{
+  FAR struct binfmt_s *curr;
+  FAR struct binfmt_s *prev;
+  int ret = -EINVAL;
+
+  if (binfmt)
+    {
+      /* Disabling pre-emption should be sufficient protection while
+       * accessing the list of registered binary format handlers.
+       */
+
+      sched_lock();
+
+      /* Search the list of registered binary format handlers for the
+       * one to be unregistered.
+       */
+
+      for (prev = NULL, curr = g_binfmts;
+           curr && curr != binfmt;
+           prev = curr, curr = curr->next);
+
+      /* Was it in the list? */
+
+      if (curr)
+        {
+          /* Yes.. was it at the head of the list? */
+
+          if (!prev)
+            {
+              /* Yes.. remove it from the head of the list */
+
+              g_binfmts = binfmt->next;
+            }
+          else
+            {
+              /* No.. remove it from the middle/end of the list */
+
+              prev->next = binfmt->next;
+            }
+
+          binfmt->next = NULL;
+          ret = OK;
+        }
+
+      sched_unlock();
+    }
+  return ret;
+}
+
+