diff options
Diffstat (limited to 'nuttx/fs/fs_dup2.c')
-rw-r--r-- | nuttx/fs/fs_dup2.c | 109 |
1 files changed, 109 insertions, 0 deletions
diff --git a/nuttx/fs/fs_dup2.c b/nuttx/fs/fs_dup2.c new file mode 100644 index 000000000..45ff2bb73 --- /dev/null +++ b/nuttx/fs/fs_dup2.c @@ -0,0 +1,109 @@ +/**************************************************************************** + * fs/fs_dup2.c + * + * Copyright (C) 2007-2009, 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 <unistd.h> +#include <sched.h> +#include <errno.h> + +#include "fs_internal.h" + +/* This logic in this applies only when both socket and file descriptors are + * in that case, this function descriminates which type of dup2 is being + * performed. + */ + +#if CONFIG_NFILE_DESCRIPTORS > 0 && defined(CONFIG_NET) && CONFIG_NSOCKET_DESCRIPTORS > 0 + +/**************************************************************************** + * Pre-processor Definitions + ****************************************************************************/ + +/**************************************************************************** + * Private Functions + ****************************************************************************/ + +/**************************************************************************** + * Global Functions + ****************************************************************************/ + +/**************************************************************************** + * Name: dup2 + * + * Description: + * Clone a file descriptor or socket descriptor to a specific descriptor + * number + * + ****************************************************************************/ + +int dup2(int fildes1, int fildes2) +{ + /* Check the range of the descriptor to see if we got a file or a socket + * descriptor. + */ + + if ((unsigned int)fildes1 >= CONFIG_NFILE_DESCRIPTORS) + { + /* Not a valid file descriptor. Did we get a valid socket descriptor? */ + + if ((unsigned int)fildes1 < (CONFIG_NFILE_DESCRIPTORS+CONFIG_NSOCKET_DESCRIPTORS)) + { + /* Yes.. dup the socket descriptor */ + + return net_dup2(fildes1, fildes2); + } + else + { + /* No.. then it is a bad descriptor number */ + + set_errno(EBADF); + return ERROR; + } + } + else + { + /* Its a valid file descriptor.. dup the file descriptor */ + + return file_dup2(fildes1, fildes2); + } +} + +#endif /* CONFIG_NFILE_DESCRIPTORS > 0 ... */ + |