source: trunk/kernel/syscalls/sys_readdir.c @ 1

Last change on this file since 1 was 1, checked in by alain, 5 years ago

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1/*
2 * sys_read.c: read entries from an opened directory
3 *
4 * Copyright (c) 2008,2009,2010,2011,2012 Ghassan Almaless
5 * Copyright (c) 2011,2012 UPMC Sorbonne Universites
6 *
7 * This file is part of ALMOS-kernel.
8 *
9 * ALMOS-kernel is free software; you can redistribute it and/or modify it
10 * under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; version 2.0 of the License.
12 *
13 * ALMOS-kernel is distributed in the hope that it will be useful, but
14 * WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
16 * General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with ALMOS-kernel; if not, write to the Free Software Foundation,
20 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
21 */
22
23#include <vfs.h>
24#include <sys-vfs.h>
25#include <task.h>
26#include <thread.h>
27
28/* FIXEME: reading dirent from user without any protection */
29
30int sys_readdir (uint_t fd, struct vfs_usp_dirent_s *dirent)
31{
32        error_t err;
33        struct ku_obj dir;
34        struct task_s *task;
35        struct thread_s *this;
36        struct vfs_file_s *file;
37 
38        file = NULL;
39        task = current_task;
40        this = current_thread;
41
42        if((dirent == NULL)                || 
43           (fd >= CONFIG_TASK_FILE_MAX_NR) || 
44           (task_fd_lookup(task, fd, &file)))
45        {
46                this->info.errno = EBADFD;
47                return -1;
48        }
49
50        KU_OBJ(dir, dirent);
51        if((err = vfs_readdir(file, &dir)))
52        {
53                this->info.errno = (err < 0) ? -err : err; 
54                return -1;
55        }
56   
57        return 0;
58}
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