source: trunk/kernel/syscalls/sys_chdir.c @ 490

Last change on this file since 490 was 457, checked in by alain, 6 years ago

This version modifies the exec syscall and fixes a large number of small bugs.
The version number has been updated (0.1)

File size: 2.3 KB
RevLine 
[1]1/*
[23]2 * sys_chdir: change process current working directory
[301]3 *
[23]4 * Author    Alain Greiner (2016,2017)
5 *
[1]6 * Copyright (c) 2011,2012 UPMC Sorbonne Universites
7 *
[23]8 * This file is part of ALMOS-MKH.
[1]9 *
[23]10 * ALMOS-MKH is free software; you can redistribute it and/or modify it
[1]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 *
[23]14 * ALMOS-MKH is distributed in the hope that it will be useful, but
[1]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
[23]20 * along with ALMOS-MKH; if not, write to the Free Software Foundation,
[1]21 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
22 */
23
[457]24#include <hal_kernel_types.h>
[23]25#include <hal_uspace.h>
[11]26#include <chdev.h>
[1]27#include <rwlock.h>
28#include <vfs.h>
[23]29#include <errno.h>
[1]30#include <thread.h>
[23]31#include <printk.h>
32#include <process.h>
[1]33
[23]34/////////////////////////////////
35int sys_chdir ( char * pathname )
[1]36{
[301]37    error_t   error;
[23]38    char      kbuf[CONFIG_VFS_MAX_PATH_LENGTH];
[1]39
[301]40    thread_t  * this    = CURRENT_THREAD;
[23]41    process_t * process = this->process;
[1]42
[407]43    // check pathname length
44    if( hal_strlen_from_uspace( pathname ) >= CONFIG_VFS_MAX_PATH_LENGTH )
[23]45    {
[407]46        printk("\n[ERROR] in %s : pathname too long\n", __FUNCTION__ );
[301]47        this->errno = ENFILE;
[23]48        return -1;
49    }
50
[407]51    // copy pathname in kernel space
52    hal_strcpy_from_uspace( kbuf , pathname , CONFIG_VFS_MAX_PATH_LENGTH );
53
[23]54    // get cluster and local pointer on reference process
55    xptr_t      ref_xp  = process->ref_xp;
56    process_t * ref_ptr = (process_t *)GET_PTR( ref_xp );
57    cxy_t       ref_cxy = GET_CXY( ref_xp );
58
59    // get extended pointer on cwd lock in reference process
60    xptr_t lock_xp = hal_remote_lwd( XPTR( ref_cxy , &ref_ptr->cwd_lock ) );
61
[301]62    // get cwd lock in read mode
63    remote_rwlock_rd_lock( lock_xp );
64
[23]65    // call relevant VFS function
[301]66    error = vfs_chdir( process->vfs_cwd_xp , kbuf );
[23]67
[301]68    // release cwd lock
69    remote_rwlock_rd_unlock( lock_xp );
[23]70
[301]71    if( error )
72    {
[23]73        printk("\n[ERROR] in %s : cannot change current directory\n", __FUNCTION__ );
[301]74        this->errno = error;
75        return -1;
76    }
77
78    return 0;
[1]79}
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