You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
125 lines
3.8 KiB
125 lines
3.8 KiB
/**************************************************************************** |
|
* net/net_dup2.c |
|
* |
|
* Copyright (C) 2009, 2011 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 "net_internal.h" |
|
|
|
#if defined(CONFIG_NET) && CONFIG_NSOCKET_DESCRIPTORS > 0 |
|
|
|
/**************************************************************************** |
|
* Global Functions |
|
****************************************************************************/ |
|
|
|
/**************************************************************************** |
|
* Function: net_dup2 |
|
* |
|
* 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(). |
|
* |
|
****************************************************************************/ |
|
|
|
#if CONFIG_NFILE_DESCRIPTORS > 0 |
|
int net_dup2(int sockfd1, int sockfd2) |
|
#else |
|
int dup2(int sockfd1, int sockfd2) |
|
#endif |
|
{ |
|
FAR struct socket *psock1; |
|
FAR struct socket *psock2; |
|
int err; |
|
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 allocated socket |
|
*/ |
|
|
|
if (!psock1 || !psock2 || psock1->s_crefs <= 0) |
|
{ |
|
err = 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); |
|
if (ret < 0) |
|
{ |
|
err = -ret; |
|
goto errout; |
|
} |
|
|
|
sched_unlock(); |
|
return OK; |
|
|
|
errout: |
|
sched_unlock(); |
|
errno = err; |
|
return ERROR; |
|
} |
|
|
|
#endif /* CONFIG_NET && CONFIG_NSOCKET_DESCRIPTORS > 0 */ |
|
|
|
|
|
|