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

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

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1/*
2 * kern/sys_getcwd.c - get process current work 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 <libk.h>
24#include <vfs.h>
25#include <sys-vfs.h>
26#include <task.h>
27#include <kmem.h>
28#include <ppm.h>
29#include <thread.h>
30
31/* TODO: user page need to be locked as long as its region */
32
33int sys_getcwd (char *buff, size_t size)
34{
35        register struct thread_s *this;
36        register struct task_s *task;
37        register error_t err;
38        struct ku_obj ku_buff;
39 
40        this      = current_thread;
41        task      = current_task;
42
43        if((size < VFS_MAX_NAME_LENGTH) || (!buff)) 
44        {
45                err = ERANGE;
46                goto SYS_GETCWD_ERROR;
47        }
48
49        if(vmm_check_address("usr cwd buffer", task, buff, size))
50        {
51                err = EFAULT;
52                goto SYS_GETCWD_ERROR;
53        }
54
55        KU_SZ_BUFF(ku_buff, buff, size);
56
57        rwlock_rdlock(&task->cwd_lock);
58
59        err = vfs_get_path(&task->vfs_cwd, &ku_buff);
60
61        rwlock_unlock(&task->cwd_lock);
62
63
64SYS_GETCWD_ERROR:
65        this->info.errno = err;
66        return (int)buff;
67}
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