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- /****************************************************************************
- * net/socket/net_dupsd2.c
- *
- * Copyright (C) 2009, 2011, 2017 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 <sys/socket.h>
- #include <sched.h>
- #include <errno.h>
- #include <debug.h>
- #include <nuttx/net/net.h>
- #include "socket/socket.h"
- #if defined(CONFIG_NET) && CONFIG_NSOCKET_DESCRIPTORS > 0
- /****************************************************************************
- * Public Functions
- ****************************************************************************/
- /****************************************************************************
- * Name: net_dupsd2
- *
- * Description:
- * Clone a socket descriptor to an arbitray descriptor number. If file
- * descriptors are implemented, then this is called by dup2() for the case
- * of socket file descriptors. If file descriptors are not implemented,
- * then this function IS dup2().
- *
- * Returned Value:
- * On success, returns the number of characters sent. On any error,
- * a negated errno value is returned:.
- *
- ****************************************************************************/
- #if CONFIG_NFILE_DESCRIPTORS > 0
- int net_dupsd2(int sockfd1, int sockfd2)
- #else
- int dup2(int sockfd1, int sockfd2)
- #endif
- {
- FAR struct socket *psock1;
- FAR struct socket *psock2;
- int ret;
- /* Lock the scheduler throughout the following */
- sched_lock();
- /* Get the socket structures underly both descriptors */
- psock1 = sockfd_socket(sockfd1);
- psock2 = sockfd_socket(sockfd2);
- /* Verify that the sockfd1 and sockfd2 both refer to valid socket
- * descriptors and that sockfd2 corresponds to an allocated socket
- */
- if (psock1 == NULL || psock2 == NULL || psock1->s_crefs <= 0)
- {
- ret = -EBADF;
- goto errout;
- }
- /* If sockfd2 also valid, allocated socket, then we will have to
- * close it!
- */
- if (psock2->s_crefs > 0)
- {
- net_close(sockfd2);
- }
- /* Duplicate the socket state */
- ret = net_clone(psock1, psock2);
- errout:
- sched_unlock();
- return ret;
- }
- #endif /* CONFIG_NET && CONFIG_NSOCKET_DESCRIPTORS > 0 */
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