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149 lines
4.4 KiB
149 lines
4.4 KiB
/**************************************************************************** |
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* net/net_dup.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 "net_internal.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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* Global Functions |
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****************************************************************************/ |
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/**************************************************************************** |
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* Function: net_dup |
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* |
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* Description: |
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* Clone a socket descriptor to an arbitray 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_dup(int sockfd, int minsd) |
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{ |
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FAR struct socket *psock1 = sockfd_socket(sockfd); |
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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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