diff options
Diffstat (limited to 'nuttx/net/net_dup.c')
-rw-r--r-- | nuttx/net/net_dup.c | 149 |
1 files changed, 149 insertions, 0 deletions
diff --git a/nuttx/net/net_dup.c b/nuttx/net/net_dup.c new file mode 100644 index 000000000..8465b7ce4 --- /dev/null +++ b/nuttx/net/net_dup.c @@ -0,0 +1,149 @@ +/**************************************************************************** + * 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 */ + + |