150 lines
4.4 KiB
C
150 lines
4.4 KiB
C
/****************************************************************************
|
|
* net/net_dup.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>
|
|
|
|
#include <sys/socket.h>
|
|
#include <sched.h>
|
|
#include <errno.h>
|
|
#include <debug.h>
|
|
|
|
#include "net_internal.h"
|
|
|
|
#if defined(CONFIG_NET) && CONFIG_NSOCKET_DESCRIPTORS > 0
|
|
|
|
/****************************************************************************
|
|
* Pre-processor Definitions
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Global Functions
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Function: net_dup
|
|
*
|
|
* Description:
|
|
* Clone a socket descriptor to an arbitray descriptor number. If file
|
|
* descriptors are implemented, then this is called by dup() for the case
|
|
* of socket file descriptors. If file descriptors are not implemented,
|
|
* then this function IS dup().
|
|
*
|
|
****************************************************************************/
|
|
|
|
int net_dup(int sockfd, int minsd)
|
|
{
|
|
FAR struct socket *psock1 = sockfd_socket(sockfd);
|
|
FAR struct socket *psock2;
|
|
int sockfd2;
|
|
int err;
|
|
int ret;
|
|
|
|
/* Make sure that the minimum socket descriptor is within the legal range.
|
|
* the minimum value we receive is relative to file descriptor 0; we need
|
|
* map it relative of the first socket descriptor.
|
|
*/
|
|
|
|
#if CONFIG_NFILE_DESCRIPTORS > 0
|
|
if (minsd >= CONFIG_NFILE_DESCRIPTORS)
|
|
{
|
|
minsd -= CONFIG_NFILE_DESCRIPTORS;
|
|
}
|
|
else
|
|
{
|
|
minsd = 0;
|
|
}
|
|
#endif
|
|
|
|
/* Lock the scheduler throughout the following */
|
|
|
|
sched_lock();
|
|
|
|
/* Get the socket structure underlying sockfd */
|
|
|
|
psock1 = sockfd_socket(sockfd);
|
|
|
|
/* Verify that the sockfd corresponds to valid, allocated socket */
|
|
|
|
if (!psock1 || psock1->s_crefs <= 0)
|
|
{
|
|
err = EBADF;
|
|
goto errout;
|
|
}
|
|
|
|
/* Allocate a new socket descriptor */
|
|
|
|
sockfd2 = sockfd_allocate(minsd);
|
|
if (sockfd2 < 0)
|
|
{
|
|
err = ENFILE;
|
|
goto errout;
|
|
}
|
|
|
|
/* Get the socket structure underlying the new descriptor */
|
|
|
|
psock2 = sockfd_socket(sockfd2);
|
|
if (!psock2)
|
|
{
|
|
err = ENOSYS; /* should not happen */
|
|
goto errout;
|
|
}
|
|
|
|
/* Duplicate the socket state */
|
|
|
|
ret = net_clone(psock1, psock2);
|
|
if (ret < 0)
|
|
{
|
|
err = -ret;
|
|
goto errout;
|
|
|
|
}
|
|
|
|
sched_unlock();
|
|
return sockfd2;
|
|
|
|
errout:
|
|
sched_unlock();
|
|
errno = err;
|
|
return ERROR;
|
|
}
|
|
|
|
#endif /* defined(CONFIG_NET) && CONFIG_NSOCKET_DESCRIPTORS > 0 */
|
|
|
|
|