gnunet-fuse

GNUnet file-sharing directory mounting via FUSE
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readdir.c (2581B)

      1 /*
      2   This file is part of gnunet-fuse.
      3   Copyright (C) 2012 GNUnet e.V.
      4   
      5   gnunet-fuse is free software; you can redistribute it and/or modify
      6   it under the terms of the GNU General Public License as published
      7   by the Free Software Foundation; either version 3, or (at your
      8   option) any later version.
      9  
     10   gnunet-fuse is distributed in the hope that it will be useful,
     11   but WITHOUT ANY WARRANTY; without even the implied warranty of
     12   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
     13   GNU General Public License for more details.
     14  
     15   You should have received a copy of the GNU General Public License
     16   along with this program; if not, write to the Free Software
     17   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301 USA
     18 
     19 */
     20 /*
     21  * readdir.c - FUSE read directory function
     22  *
     23  *  Created on: Mar 14, 2012
     24  *      Author: MG, Christian Grothoff, Matthias Wachs,
     25  *      		Krista Bennett, James Blackwell, Igor Wronsky
     26  *
     27  * Read directory
     28  *
     29  * This supersedes the old getdir() interface.  New applications
     30  * should use this.
     31  *
     32  * The filesystem may choose between two modes of operation:
     33  *
     34  * 1) The readdir implementation ignores the offset parameter, and
     35  * passes zero to the filler function's offset.  The filler
     36  * function will not return '1' (unless an error happens), so the
     37  * whole directory is read in a single readdir operation.  This
     38  * works just like the old getdir() method.
     39  *
     40  * 2) The readdir implementation keeps track of the offsets of the
     41  * directory entries.  It uses the offset parameter and always
     42  * passes non-zero offset to the filler function.  When the buffer
     43  * is full (or an error happens) the filler function will return
     44  * '1'.
     45  *
     46  * Introduced in version 2.3
     47  */
     48 /**
     49  * @file fuse/readdir.c
     50  * @brief readdir of fuse
     51  * @author Christian Grothoff
     52  */
     53 #include "gnunet-fuse.h"
     54 #include "gfs_download.h"
     55 
     56 
     57 int
     58 gn_readdir (const char *path, void *buf, fuse_fill_dir_t filler,
     59 	    off_t offset, struct fuse_file_info *fi)
     60 {
     61   struct GNUNET_FUSE_PathInfo *path_info;
     62   struct GNUNET_FUSE_PathInfo *pos;
     63   int eno;
     64 
     65   path_info = GNUNET_FUSE_path_info_get (path, &eno);
     66   if (NULL == path_info)
     67     return - eno;
     68   if ( (NULL == path_info->tmpfile) &&
     69        (GNUNET_OK != GNUNET_FUSE_load_directory (path_info, &eno)) )
     70     return - eno;
     71   filler (buf, ".", NULL, 0);
     72   filler (buf, "..", NULL, 0);
     73   for (pos = path_info->child_head; NULL != pos; pos = pos->next)
     74     filler (buf, pos->filename, 
     75 	    &pos->stbuf,
     76 	    0);
     77   GNUNET_FUSE_path_info_done (path_info);
     78   return 0;
     79 }
     80 
     81 /* end of readdir.c */