1 files changed, 107 insertions, 0 deletions
diff --git a/nuttx/fs/fs_dup.c b/nuttx/fs/fs_dup.c
new file mode 100644
index 000000000..890da039b
--- /dev/null
+++ b/nuttx/fs/fs_dup.c
@@ -0,0 +1,107 @@
+/****************************************************************************
+ * fs/fs_dup.c
+ *
+ *   Copyright (C) 2007-2009 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * 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 <unistd.h>
+#include <sched.h>
+#include <errno.h>
+
+#include <nuttx/fs/fs.h>
+#include "fs_internal.h"
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Global Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: dup
+ *
+ * Description:
+ *   Clone a file or socket descriptor to an arbitray descriptor number
+ *
+ ****************************************************************************/
+
+int dup(int fildes)
+{
+ int ret = OK;
+
+  /* Check the range of the descriptor to see if we got a file or a socket
+   * descriptor. */
+
+#if CONFIG_NFILE_DESCRIPTORS > 0
+  if ((unsigned int)fildes < CONFIG_NFILE_DESCRIPTORS)
+    {
+      /* Its a valid file descriptor.. dup the file descriptor using any
+       * other file descriptor*/
+
+      ret = file_dup(fildes, 0);
+    }
+  else
+#endif
+    {
+      /* Not a vailid file descriptor.  Did we get a valid socket descriptor? */
+
+#if defined(CONFIG_NET) && CONFIG_NSOCKET_DESCRIPTORS > 0
+      if ((unsigned int)fildes < (CONFIG_NFILE_DESCRIPTORS+CONFIG_NSOCKET_DESCRIPTORS))
+        {
+          /* Yes.. dup the socket descriptor */
+
+          ret = net_dup(fildes, CONFIG_NFILE_DESCRIPTORS);
+        }
+      else
+#endif
+        {
+          /* No.. then it is a bad descriptor number */
+
+          set_errno(EBADF);
+          ret = ERROR;
+        }
+    }
+
+  return ret;
+}