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/*
Copyright (C) 1999 Free Software Foundation, Inc.
Written by Thomas Bushnell, BSG.
This file is part of the GNU Hurd.
The GNU Hurd is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License as
published by the Free Software Foundation; either version 2, or (at
your option) any later version.
The GNU Hurd is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA. */
#include "fshelp.h"
/* Check to see whether USER is allowed to modify DIR with respect to
existing file ST. (If there is no existing file, pass 0 for ST.)
If the access is permissable return 0; otherwise return an
appropriate error code. */
error_t
fshelp_checkdirmod (struct stat *dir, struct stat *st, struct iouser *user)
{
error_t err;
/* The user must be able to write the directory. */
err = fshelp_access (dir, S_IWRITE, user);
if (err)
return err;
/* If the directory is sticky, the user must own either it or the file. */
if ((dir->st_mode & S_ISVTX) && st
&& fshelp_isowner (dir, user) && fshelp_isowner (st, user))
return EACCES;
return 0;
}
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