Ignore:
Timestamp:
Jun 18, 2017, 10:06:41 PM (5 years ago)
Author:
alain
Message:

Introduce syscalls.

File:
1 edited

Legend:

Unmodified
Added
Removed
  • trunk/kernel/syscalls/sys_chdir.c

    r11 r23  
    11/*
    2  * sys_chdir: change process current work directory
     2 * sys_chdir: change process current working directory
    33 *
    4  * Copyright (c) 2008,2009,2010,2011,2012 Ghassan Almaless
     4 * Author    Alain Greiner (2016,2017)
     5 *
    56 * Copyright (c) 2011,2012 UPMC Sorbonne Universites
    67 *
    7  * This file is part of ALMOS-kernel.
     8 * This file is part of ALMOS-MKH.
    89 *
    9  * ALMOS-kernel is free software; you can redistribute it and/or modify it
     10 * ALMOS-MKH is free software; you can redistribute it and/or modify it
    1011 * under the terms of the GNU General Public License as published by
    1112 * the Free Software Foundation; version 2.0 of the License.
    1213 *
    13  * ALMOS-kernel is distributed in the hope that it will be useful, but
     14 * ALMOS-MKH is distributed in the hope that it will be useful, but
    1415 * WITHOUT ANY WARRANTY; without even the implied warranty of
    1516 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     
    1718 *
    1819 * 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 * along with ALMOS-MKH; if not, write to the Free Software Foundation,
    2021 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
    2122 */
    2223
    23 #include <cpu.h>
     24#include <hal_types.h>
     25#include <hal_uspace.h>
    2426#include <chdev.h>
    25 #include <driver.h>
    2627#include <rwlock.h>
    2728#include <vfs.h>
    28 #include <sys-vfs.h>
     29#include <errno.h>
    2930#include <thread.h>
    30 #include <ku_transfert.h>
    31 #include <task.h>
     31#include <printk.h>
     32#include <process.h>
    3233
    33 int sys_chdir (char *pathname)
     34/////////////////////////////////
     35int sys_chdir ( char * pathname )
    3436{
    35         register error_t err = 0;
    36         register struct thread_s *this;
    37         register struct task_s *task;
    38         struct ku_obj ku_path;
     37        error_t   error;
     38    paddr_t   paddr;
     39    uint32_t  length;
     40    char      kbuf[CONFIG_VFS_MAX_PATH_LENGTH];
    3941
    40         this = current_thread;
    41         task = current_task;
     42        thread_t  * this    = CURRENT_THREAD;
     43    process_t * process = this->process;
    4244
    43         if(!pathname)
     45    // check pathname in user space
     46    error = vmm_v2p_translate( false , pathname , &paddr );
     47
     48        if( error )
    4449        {
    45                 this->info.errno = EINVAL;
     50        printk("\n[ERROR] in %s : user buffer unmapped  for thread %x in process %x\n",
     51               __FUNCTION__ , this->trdid , process->pid );
     52                this->errno = EINVAL;
    4653                return -1;
    4754        }       
    4855     
    49         KU_BUFF(ku_path, pathname);
    50         rwlock_wrlock(&task->cwd_lock);
     56    // get pathname length
     57    length = hal_strlen_from_uspace( pathname );
     58
     59    if( length >= CONFIG_VFS_MAX_PATH_LENGTH )
     60    {
     61        printk("\n[ERROR] in %s : pathname too long for thread %x in process %x\n",
     62               __FUNCTION__ , this->trdid , process->pid );
     63                this->errno = ENFILE;
     64        return -1;
     65    }
     66 
     67        // get pathname copy in kernel space
     68    hal_copy_from_uspace( kbuf, pathname, length );
     69
     70    // get cluster and local pointer on reference process
     71    xptr_t      ref_xp  = process->ref_xp;
     72    process_t * ref_ptr = (process_t *)GET_PTR( ref_xp );
     73    cxy_t       ref_cxy = GET_CXY( ref_xp );
     74
     75    // get extended pointer on cwd lock in reference process
     76    xptr_t lock_xp = hal_remote_lwd( XPTR( ref_cxy , &ref_ptr->cwd_lock ) );
    5177       
    52         if((err = vfs_chdir(&ku_path, &task->vfs_cwd)))
     78    // get cwd lock in read mode
     79        remote_rwlock_rd_lock( lock_xp );
     80
     81    // call relevant VFS function
     82        error = vfs_chdir( process->vfs_cwd_xp , kbuf );
     83
     84    // release cwd lock
     85        remote_rwlock_rd_unlock( lock_xp );
     86
     87        if( error )
    5388        {
    54                 rwlock_unlock(&task->cwd_lock);
    55                 this->info.errno = (err < 0) ? -err : err;
     89        printk("\n[ERROR] in %s : cannot change current directory\n", __FUNCTION__ );
     90                this->errno = error;
    5691                return -1;
    5792        }
    5893   
    59         rwlock_unlock(&task->cwd_lock);
    6094        return 0;
    6195}
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