/* -*- 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_getcwd.c
*
* Implementation of system call "getcwd", "chdir" and "fchdir".
*/
#include
#include
#include
#include
#include
#include
#include
#include
#include
int shim_do_getcwd (char * buf, size_t len)
{
int ret = 0;
if (buf == NULL || len == 0) {
ret = -EINVAL;
goto out;
}
struct shim_thread * thread = get_cur_thread();
assert(thread);
struct shim_dentry * cwd = thread->cwd;
int plen;
const char * path = dentry_get_path(cwd, true, &plen);
if (plen > len) {
ret = -ENAMETOOLONG;
goto out;
} else
ret = plen;
memcpy(buf, path, plen + 1);
out:
return ret;
}
int shim_do_chdir (const char * filename)
{
struct shim_thread * thread = get_cur_thread();
assert(thread);
struct shim_dentry * dent = NULL;
int ret;
if ((ret = path_lookupat(NULL, filename, LOOKUP_OPEN, &dent)) < 0)
return ret;
if (!dent)
return -ENOENT;
if (!(dent->state & DENTRY_ISDIRECTORY)) {
debug("%s is not a directory\n", dentry_get_path(dent, false, NULL));
put_dentry(dent);
return -ENOTDIR;
}
lock(thread->lock);
put_dentry(thread->cwd);
thread->cwd = dent;
unlock(thread->lock);
return 0;
}
int shim_do_fchdir (int fd)
{
struct shim_thread * thread = get_cur_thread();
struct shim_handle * hdl = get_fd_handle(fd, NULL, thread->handle_map);
if (!hdl)
return -EBADF;
struct shim_dentry * dent = hdl->dentry;
if (!(dent->state & DENTRY_ISDIRECTORY)) {
debug("%s is not a directory\n", dentry_get_path(dent, false, NULL));
put_handle(hdl);
return -ENOTDIR;
}
lock(thread->lock);
get_dentry(dent);
put_dentry(thread->cwd);
thread->cwd = dent;
unlock(thread->lock);
put_handle(hdl);
return 0;
}