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/net/net_clone.c | 117 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 117 insertions(+)
 create mode 100644 nuttx/net/net_clone.c

(limited to 'nuttx/net/net_clone.c')

diff --git a/nuttx/net/net_clone.c b/nuttx/net/net_clone.c
new file mode 100644
index 000000000..e23016073
--- /dev/null
+++ b/nuttx/net/net_clone.c
@@ -0,0 +1,117 @@
+/****************************************************************************
+ * net/net_clone.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>
+#ifdef CONFIG_NET
+
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <errno.h>
+#include <debug.h>
+
+#include <nuttx/arch.h>
+
+#include "net_internal.h"
+
+/****************************************************************************
+ * Global Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Function: net_clone
+ *
+ * Description:
+ *   Performs the low level, common portion of net_dup() and net_dup2()
+ *
+ ****************************************************************************/
+
+int net_clone(FAR struct socket *psock1, FAR struct socket *psock2)
+{
+  irqstate_t flags;
+  int ret = OK;
+
+  /* Parts of this operation need to be atomic */
+
+  flags = irqsave();
+
+  /* Duplicate the socket state */
+
+  psock2->s_type     = psock1->s_type;      /* Protocol type: Only SOCK_STREAM or SOCK_DGRAM */
+  psock2->s_flags    = psock1->s_flags;     /* See _SF_* definitions */
+#ifdef CONFIG_NET_SOCKOPTS
+  psock2->s_options  = psock1->s_options;   /* Selected socket options */
+#endif
+#ifndef CONFIG_DISABLE_CLOCK
+  psock2->s_rcvtimeo = psock1->s_rcvtimeo;  /* Receive timeout value (in deciseconds) */
+  psock2->s_sndtimeo = psock1->s_sndtimeo;  /* Send timeout value (in deciseconds) */
+#endif
+  psock2->s_conn     = psock1->s_conn;      /* UDP or TCP connection structure */
+
+  /* Increment the reference count on the connection */
+
+#ifdef CONFIG_NET_TCP
+  if (psock2->s_type == SOCK_STREAM)
+    {
+      struct uip_conn *conn = psock2->s_conn;
+      DEBUGASSERT(conn->crefs > 0);
+      conn->crefs++;
+    }
+  else
+#endif
+#ifdef CONFIG_NET_UDP
+  if (psock2->s_type == SOCK_DGRAM)
+    {
+      struct uip_udp_conn *conn = psock2->s_conn;
+      DEBUGASSERT(conn->crefs > 0);
+      conn->crefs++;
+    }
+  else
+#endif
+    {
+      ndbg("Unsupported type: %d\n", psock2->s_type);
+      ret = -EBADF;
+    }
+
+  irqrestore(flags);
+  return ret;
+}
+
+#endif /* CONFIG_NET */
+
+
-- 
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