gnunet-fuse

GNUnet file-sharing directory mounting via FUSE
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open.c (2053B)

      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  * open.c - FUSE open function
     22  *
     23  *  Created on: Mar 14, 2012
     24  *      Author: mg
     25  *
     26  *  File open operation
     27  *
     28  * No creation (O_CREAT, O_EXCL) and by default also no
     29  * truncation (O_TRUNC) flags will be passed to open(). If an
     30  * application specifies O_TRUNC, fuse first calls truncate()
     31  * and then open(). Only if 'atomic_o_trunc' has been
     32  * specified and kernel version is 2.6.24 or later, O_TRUNC is
     33  * passed on to open.
     34  *
     35  * Unless the 'default_permissions' mount option is given,
     36  * open should check if the operation is permitted for the
     37  * given flags. Optionally open may also return an arbitrary
     38  * filehandle in the fuse_file_info structure, which will be
     39  * passed to all file operations.
     40  *
     41  * Changed in version 2.2
     42  */
     43 
     44 /**
     45  * @file fuse/open.c
     46  * @brief opening files
     47  * @author Christian Grothoff
     48  */
     49 #include "gnunet-fuse.h"
     50 #include "gfs_download.h"
     51 
     52 
     53 int
     54 gn_open (const char *path, struct fuse_file_info *fi)
     55 {
     56   struct GNUNET_FUSE_PathInfo *pi;
     57   int eno;
     58 
     59   pi = GNUNET_FUSE_path_info_get (path, &eno);
     60   if (NULL == pi)
     61     return - eno;
     62   /* NOTE: once we allow writes, we need to keep the RC
     63      incremented until close... */
     64   GNUNET_FUSE_path_info_done (pi);
     65   if (O_RDONLY != (fi->flags & 3))
     66     return - EACCES;
     67   return 0;
     68 }
     69 
     70 /* end of open.c */