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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 the user USER can operate on a file identified
by ST. OP is one of S_IREAD, S_IWRITE, and S_IEXEC. If the access
is permitted, return zero; otherwise return an appropriate error
code. */
error_t
fshelp_access (struct stat *st, int op, struct iouser *user)
{
int gotit;
if (idvec_contains (user->uids, 0))
gotit = (op != S_IEXEC) || (st->st_mode & (S_IXUSR | S_IXGRP | S_IXOTH));
else if (user->uids->num == 0 && (st->st_mode & S_IUSEUNK))
gotit = st->st_mode & (op << S_IUNKSHIFT);
else if (!fshelp_isowner (st, user))
gotit = st->st_mode & op;
else if (idvec_contains (user->gids, st->st_gid))
gotit = st->st_mode & (op >> 3);
else
gotit = st->st_mode & (op >> 6);
return gotit ? 0 : EACCES;
}
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