150 lines
4.4 KiB
C
150 lines
4.4 KiB
C
/****************************************************************************
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* net/socket/net_dupsd.c
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*
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* Copyright (C) 2009 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <sys/socket.h>
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#include <sched.h>
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#include <errno.h>
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#include <debug.h>
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#include "socket/socket.h"
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#if defined(CONFIG_NET) && CONFIG_NSOCKET_DESCRIPTORS > 0
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Function: net_dupsd
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*
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* Description:
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* Clone a socket descriptor to an arbitrary descriptor number. If file
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* descriptors are implemented, then this is called by dup() for the case
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* of socket file descriptors. If file descriptors are not implemented,
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* then this function IS dup().
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*
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****************************************************************************/
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int net_dupsd(int sockfd, int minsd)
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{
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FAR struct socket *psock1;
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FAR struct socket *psock2;
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int sockfd2;
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int err;
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int ret;
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/* Make sure that the minimum socket descriptor is within the legal range.
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* The minimum value we receive is relative to file descriptor 0; we need
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* map it relative of the first socket descriptor.
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*/
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#if CONFIG_NFILE_DESCRIPTORS > 0
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if (minsd >= CONFIG_NFILE_DESCRIPTORS)
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{
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minsd -= CONFIG_NFILE_DESCRIPTORS;
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}
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else
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{
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minsd = 0;
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}
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#endif
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/* Lock the scheduler throughout the following */
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sched_lock();
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/* Get the socket structure underlying sockfd */
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psock1 = sockfd_socket(sockfd);
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/* Verify that the sockfd corresponds to valid, allocated socket */
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if (!psock1 || psock1->s_crefs <= 0)
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{
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err = EBADF;
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goto errout;
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}
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/* Allocate a new socket descriptor */
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sockfd2 = sockfd_allocate(minsd);
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if (sockfd2 < 0)
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{
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err = ENFILE;
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goto errout;
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}
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/* Get the socket structure underlying the new descriptor */
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psock2 = sockfd_socket(sockfd2);
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if (!psock2)
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{
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err = ENOSYS; /* should not happen */
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goto errout;
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}
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/* Duplicate the socket state */
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ret = net_clone(psock1, psock2);
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if (ret < 0)
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{
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err = -ret;
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goto errout;
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}
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sched_unlock();
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return sockfd2;
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errout:
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sched_unlock();
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errno = err;
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return ERROR;
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}
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#endif /* defined(CONFIG_NET) && CONFIG_NSOCKET_DESCRIPTORS > 0 */
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