/* -*- mode:c; c-file-style:"k&r"; c-basic-offset: 4; tab-width:4; indent-tabs-mode:nil; mode:auto-fill; fill-column:78; -*- */
/* vim: set ts=4 sw=4 et tw=78 fo=cqt wm=0: */
/* Copyright (C) 2014 OSCAR lab, Stony Brook University
This file is part of Graphene Library OS.
Graphene Library OS 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 3 of the
License, or (at your option) any later version.
Graphene Library OS 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, see . */
/*
* shim_access.c
*
* Implementation of system call "access" and "faccessat".
*/
#include
#include
#include
#include
#include
#include
#include
#include
#include
int shim_do_access (const char * file, mode_t mode)
{
if (!file)
return -EINVAL;
struct shim_dentry * dent = NULL;
int ret = 0;
ret = path_lookupat(NULL, file, LOOKUP_ACCESS, &dent);
if (!ret)
ret = permission(dent, mode, 1);
return ret;
}
int shim_do_faccessat (int dfd, const char * filename, mode_t mode)
{
if (!filename)
return -EINVAL;
if (*filename == '/')
return shim_do_access(filename, mode);
struct shim_dentry * dir = NULL, * dent = NULL;
int ret = 0;
if ((ret = path_startat(dfd, &dir)) < 0)
return ret;
ret = path_lookupat(dir, filename, LOOKUP_ACCESS, &dent);
if (ret < 0)
goto out;
ret = permission(dent, mode, 1);
out:
put_dentry(dir);
return ret;
}