source: trunk/kernel/syscalls/sys_chdir.c @ 566

Last change on this file since 566 was 566, checked in by alain, 3 years ago

Complete restructuration of kernel locks.

File size: 2.5 KB
Line 
1/*
2 * sys_chdir: change process current working directory
3 *
4 * Author    Alain Greiner (2016,2017)
5 *
6 * Copyright (c) 2011,2012 UPMC Sorbonne Universites
7 *
8 * This file is part of ALMOS-MKH.
9 *
10 * ALMOS-MKH is free software; you can redistribute it and/or modify it
11 * under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; version 2.0 of the License.
13 *
14 * ALMOS-MKH is distributed in the hope that it will be useful, but
15 * WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
17 * General Public License for more details.
18 *
19 * You should have received a copy of the GNU General Public License
20 * along with ALMOS-MKH; if not, write to the Free Software Foundation,
21 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
22 */
23
24#include <hal_kernel_types.h>
25#include <hal_uspace.h>
26#include <chdev.h>
27#include <rwlock.h>
28#include <vfs.h>
29#include <errno.h>
30#include <thread.h>
31#include <printk.h>
32#include <process.h>
33
34#include <syscalls.h>
35
36/////////////////////////////////
37int sys_chdir ( char * pathname )
38{
39    error_t   error;
40    char      kbuf[CONFIG_VFS_MAX_PATH_LENGTH];
41
42    thread_t  * this    = CURRENT_THREAD;
43    process_t * process = this->process;
44
45    // check pathname length
46    if( hal_strlen_from_uspace( pathname ) >= CONFIG_VFS_MAX_PATH_LENGTH )
47    {
48
49#if DEBUG_SYSCALLS_ERROR
50printk("\n[ERROR] in %s : pathname too long / thread %x in process %x\n",
51__FUNCTION__, this->trdid, process->pid );
52#endif
53        this->errno = ENFILE;
54        return -1;
55    }
56
57    // copy pathname in kernel space
58    hal_strcpy_from_uspace( kbuf , pathname , CONFIG_VFS_MAX_PATH_LENGTH );
59
60    printk("\n[ERROR] in %s : not implemented yet\n", __FUNCTION__ );
61    return -1;
62
63    // get cluster and local pointer on reference process
64    // xptr_t      ref_xp  = process->ref_xp;
65    // process_t * ref_ptr = (process_t *)GET_PTR( ref_xp );
66    // cxy_t       ref_cxy = GET_CXY( ref_xp );
67
68    // get extended pointer on cwd lock in reference process
69    // xptr_t lock_xp = hal_remote_l64( XPTR( ref_cxy , &ref_ptr->cwd_lock ) );
70
71    // get cwd lock in read mode
72    // remote_rwlock_rd_acquire( lock_xp );
73
74    // TODO ce n'et pas au VFS de le faire [AG]
75    // error = vfs_chdir( process->vfs_cwd_xp , kbuf );
76
77    // release cwd lock
78    // remote_rwlock_rd_release( lock_xp );
79
80    if( error )
81    {
82        printk("\n[ERROR] in %s : cannot change current directory\n", __FUNCTION__ );
83        this->errno = error;
84        return -1;
85    }
86
87    return 0;
88}
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