From f2675bf333e0378c842717a94a13c73dabb76a52 Mon Sep 17 00:00:00 2001
From: patacongo <patacongo@42af7a65-404d-4744-a932-0658087f49c3>
Date: Mon, 15 Jun 2009 18:58:22 +0000
Subject: dup() and dup2() support for socket descriptors

git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@1884 42af7a65-404d-4744-a932-0658087f49c3
---
 nuttx/fs/fs_dup.c | 109 +++++++++++++++++++-----------------------------------
 1 file changed, 38 insertions(+), 71 deletions(-)

(limited to 'nuttx/fs/fs_dup.c')

diff --git a/nuttx/fs/fs_dup.c b/nuttx/fs/fs_dup.c
index 8f8b332b1..20b7fbf27 100644
--- a/nuttx/fs/fs_dup.c
+++ b/nuttx/fs/fs_dup.c
@@ -1,7 +1,7 @@
 /****************************************************************************
  * fs/fs_dup.c
  *
- *   Copyright (C) 2007, 2008 Gregory Nutt. All rights reserved.
+ *   Copyright (C) 2007-2009 Gregory Nutt. All rights reserved.
  *   Author: Gregory Nutt <spudmonkey@racsa.co.cr>
  *
  * Redistribution and use in source and binary forms, with or without
@@ -43,16 +43,21 @@
 #include <unistd.h>
 #include <sched.h>
 #include <errno.h>
+
+#include <nuttx/fs.h>
 #include "fs_internal.h"
 
+/* This logic in this applies only when both socket and file descriptors are
+ * in that case, this function descriminates which type of dup is being
+ * performed.
+ */
+
+#if CONFIG_NFILE_DESCRIPTORS > 0 && defined(CONFIG_NET) && CONFIG_NSOCKET_DESCRIPTORS > 0
+
 /****************************************************************************
  * Definitions
  ****************************************************************************/
 
-#define DUP_ISOPEN(fd, list) \
-  ((unsigned int)fd < CONFIG_NFILE_DESCRIPTORS && \
-   list->fl_files[fd].f_inode != NULL)
-
 /****************************************************************************
  * Private Functions
  ****************************************************************************/
@@ -61,82 +66,44 @@
  * Global Functions
  ****************************************************************************/
 
+/****************************************************************************
+ * Name: dup
+ *
+ * Description:
+ *   Clone a file or socket descriptor to an arbitray descriptor number
+ *
+ ****************************************************************************/
+
 int dup(int fildes)
 {
-  FAR struct filelist *list;
-  int fildes2;
+  /* Check the range of the descriptor to see if we got a file or a socket
+   * descriptor. */
 
-  /* Get the thread-specific file list */
-
-  list = sched_getfiles();
-  if (!list)
+  if ((unsigned int)fildes >= CONFIG_NFILE_DESCRIPTORS)
     {
-      *get_errno_ptr() = EMFILE;
-      return ERROR;
-    }
-
- /* Verify that fildes is a valid, open file descriptor */
+      /* Not a vailid file descriptor.  Did we get a valid socket descriptor? */
 
-  if (!DUP_ISOPEN(fildes, list))
-    {
-      *get_errno_ptr() = EBADF;
-      return ERROR;
-    }
+      if ((unsigned int)fildes < (CONFIG_NFILE_DESCRIPTORS+CONFIG_NSOCKET_DESCRIPTORS))
+        {
+          /* Yes.. dup the socket descriptor */
 
-  /* Increment the reference count on the contained inode */
+          return net_dup(fildes);
+        }
+      else
+        {
+          /* No.. then it is a bad descriptor number */
 
-  inode_addref(list->fl_files[fildes].f_inode);
-
-  /* Then allocate a new file descriptor for the inode */
-
-  fildes2 = files_allocate(list->fl_files[fildes].f_inode,
-                           list->fl_files[fildes].f_oflags,
-                           list->fl_files[fildes].f_pos);
-  if (fildes2 < 0)
-    {
-      *get_errno_ptr() = EMFILE;
-       inode_release(list->fl_files[fildes].f_inode);
-      return ERROR;
+          errno = EBADF;
+          return ERROR;
+        }
     }
-  return fildes2;
-}
-
-int dup2(int fildes1, int fildes2)
-{
-  FAR struct filelist *list;
-
-  /* Get the thread-specific file list */
-
-  list = sched_getfiles();
-  if (!list)
+  else
     {
-      *get_errno_ptr() = EMFILE;
-      return ERROR;
-    }
+      /* Its a valid file descriptor.. dup the file descriptor */
 
- /* Verify that fildes is a valid, open file descriptor */
-
-  if (!DUP_ISOPEN(fildes1, list))
-    {
-      *get_errno_ptr() = EBADF;
-      return ERROR;
+      return file_dup(fildes);
     }
-
-  /* Handle a special case */
-
-  if (fildes1 == fildes2)
-    {
-      return fildes1;
-    }
-
-  /* Verify fildes2 */
-
-  if ((unsigned int)fildes2 >= CONFIG_NFILE_DESCRIPTORS)
-    {
-        *get_errno_ptr() = EBADF;
-        return ERROR;
-    }
-
-  return files_dup(&list->fl_files[fildes1], &list->fl_files[fildes2]);
 }
 
+#endif /* CONFIG_NFILE_DESCRIPTORS > 0 ... */
+
-- 
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