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_rmdir.c

    r1 r23  
    11/*
    2  * sys_rmdir: remove a directory
     2 * sys_rmdir.c - Remove a directory from file system.
     3 *
     4 * Author    Alain Greiner (2016,2017)
    35 *
    46 * Copyright (c) 2015 UPMC Sorbonne Universites
    57 *
    6  * This file is part of ALMOS-kernel.
     8 * This file is part of ALMOS-MKH.
    79 *
    8  * 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
    911 * under the terms of the GNU General Public License as published by
    1012 * the Free Software Foundation; version 2.0 of the License.
    1113 *
    12  * 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
    1315 * WITHOUT ANY WARRANTY; without even the implied warranty of
    1416 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     
    1618 *
    1719 * You should have received a copy of the GNU General Public License
    18  * 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,
    1921 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
    2022 */
    2123
    22 #include <cpu.h>
     24#include <hal_types.h>
     25#include <hal_uspace.h>
     26#include <printk.h>
     27#include <errno.h>
    2328#include <vfs.h>
    24 #include <sys-vfs.h>
     29#include <vmm.h>
    2530#include <thread.h>
    26 #include <task.h>
     31#include <process.h>
    2732
     33////////////////////////////////
     34int sys_rmdir( char * pathname )
     35{
     36    error_t     error;
     37    paddr_t     paddr;
     38    uint32_t    length;
     39    char        kbuf[CONFIG_VFS_MAX_PATH_LENGTH];
     40       
     41        thread_t  * this    = CURRENT_THREAD;
     42        process_t * process = this->process;
    2843
    29 int sys_rmdir (char *pathname)
    30 {
    31         register struct thread_s *this;
    32         register struct task_s *task;
    33         struct ku_obj ku_path;
    34         error_t err = 0;
    35        
    36         this = current_thread;
    37         task = current_task;
     44    // check pathname in user space
     45    error = vmm_v2p_translate( false , pathname , &paddr );
    3846
    39         if(!pathname)
     47        if( error )
    4048        {
    41                 this->info.errno = EINVAL;
     49        printk("\n[ERROR] in %s : user buffer unmapped  for thread %x in process %x\n",
     50               __FUNCTION__ , this->trdid , process->pid );
     51                this->errno = EINVAL;
     52                return -1;
     53        }       
     54
     55    // get pathname length
     56    length = hal_strlen_from_uspace( pathname );
     57
     58    if( length >= CONFIG_VFS_MAX_PATH_LENGTH )
     59    {
     60        printk("\n[ERROR] in %s : pathname too long\n", __FUNCTION__ );
     61                this->errno = ENFILE;
     62        return -1;
     63    }
     64 
     65        // get pathname copy in kernel space
     66    hal_copy_from_uspace( kbuf, pathname, length );
     67
     68    // get cluster and local pointer on reference process
     69    xptr_t      ref_xp  = process->ref_xp;
     70    process_t * ref_ptr = (process_t *)GET_PTR( ref_xp );
     71    cxy_t       ref_cxy = GET_CXY( ref_xp );
     72
     73    // get extended pointer on cwd inode
     74    xptr_t cwd_xp = hal_remote_lwd( XPTR( ref_cxy , &ref_ptr->vfs_cwd_xp ) );
     75   
     76    // get the cwd lock in read mode from reference process
     77        remote_rwlock_rd_lock( XPTR( ref_cxy , &ref_ptr->cwd_lock ) );
     78
     79    // call the relevant VFS function
     80        error = vfs_rmdir( cwd_xp,
     81                       kbuf );
     82
     83    // release the cwd lock
     84        remote_rwlock_rd_unlock( XPTR( ref_cxy , &ref_ptr->cwd_lock ) );
     85
     86    if( error )
     87        {
     88        printk("\n[ERROR] in %s : cannot remove directory %s\n",
     89               __FUNCTION__ , kbuf );
     90                this->errno = error;
    4291                return -1;
    4392        }
     93   
     94        return 0;
    4495
    45         KU_BUFF(ku_path, pathname);
    46         rwlock_wrlock(&task->cwd_lock);
    47 
    48         if((err = vfs_rmdir(&current_task->vfs_cwd, &ku_path)))
    49         {
    50                 current_thread->info.errno = (err < 0) ? -err : err;
    51                 rwlock_unlock(&task->cwd_lock);
    52                 return -1;
    53         }
    54        
    55         rwlock_unlock(&task->cwd_lock);
    56         return 0;
    57 }
     96}  // end sys_rmdir()
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