/* Copyright (C) 2014 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 Lesser 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 Lesser General Public License for more details.
You should have received a copy of the GNU Lesser 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
#ifndef ERANGE
#define ERANGE 34
#endif
int shim_do_getcwd(char* buf, size_t len) {
if (!buf || !len)
return -EINVAL;
if (test_user_memory(buf, len, true))
return -EFAULT;
struct shim_thread* thread = get_cur_thread();
assert(thread);
struct shim_dentry* cwd = thread->cwd;
size_t plen;
const char* path = dentry_get_path(cwd, true, &plen);
int ret;
if (plen >= MAX_PATH) {
ret = -ENAMETOOLONG;
} else if (plen + 1 > len) {
ret = -ERANGE;
} else {
ret = plen + 1;
memcpy(buf, path, plen + 1);
}
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 (!filename)
return -EINVAL;
if (test_user_string(filename))
return -EFAULT;
if (strnlen(filename, MAX_PATH + 1) == MAX_PATH + 1)
return -ENAMETOOLONG;
if ((ret = path_lookupat(NULL, filename, LOOKUP_OPEN, &dent, NULL)) < 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;
}