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

1 files changed, 108 insertions, 0 deletions

diff --git a/nuttx/fs/fs_dup2.c b/nuttx/fs/fs_dup2.c
new file mode 100644
index 000000000..546c024dc
--- /dev/null
+++ b/nuttx/fs/fs_dup2.c
@@ -0,0 +1,108 @@
+/****************************************************************************
+ * fs/fs_dup2.c
+ *
+ *   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
+ * 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 <unistd.h>
+#include <sched.h>
+#include <errno.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 dup2 is being
+ * performed.
+ */
+
+#if CONFIG_NFILE_DESCRIPTORS > 0 && defined(CONFIG_NET) && CONFIG_NSOCKET_DESCRIPTORS > 0
+
+/****************************************************************************
+ * Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Global Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: dup2
+ *
+ * Description:
+ *   Clone a file descriptor or socket descriptor to a specific descriptor
+ *   number
+ *
+ ****************************************************************************/
+
+int dup2(int fildes1, int fildes2)
+{
+  /* Check the range of the descriptor to see if we got a file or a socket
+   * descriptor. */
+
+  if ((unsigned int)fildes1 >= CONFIG_NFILE_DESCRIPTORS)
+    {
+      /* Not a vailid file descriptor.  Did we get a valid socket descriptor? */
+
+      if ((unsigned int)fildes1 < (CONFIG_NFILE_DESCRIPTORS+CONFIG_NSOCKET_DESCRIPTORS))
+        {
+          /* Yes.. dup the socket descriptor */
+
+          return net_dup2(fildes1, fildes2);
+        }
+      else
+        {
+          /* No.. then it is a bad descriptor number */
+
+          errno = EBADF;
+          return ERROR;
+        }
+    }
+  else
+    {
+      /* Its a valid file descriptor.. dup the file descriptor */
+
+      return file_dup2(fildes1, fildes2);
+    }
+}
+
+#endif /* CONFIG_NFILE_DESCRIPTORS > 0 ... */
+