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_mkdir.c

    r1 r23  
    11/*
    2  * kern/sys_mkdir.c - creates new directory
     2 * sys_mkdir.c - Create a new directory
    33 *
    4  * Copyright (c) 2008,2009,2010,2011,2012 Ghassan Almaless
    5  * Copyright (c) 2011,2012 UPMC Sorbonne Universites
     4 * Author    Alain Greiner (2016,2017)
    65 *
    7  * This file is part of ALMOS-kernel.
     6 * Copyright (c) UPMC Sorbonne Universites
    87 *
    9  * ALMOS-kernel is free software; you can redistribute it and/or modify it
     8 * This file is part of ALMOS-MKH.
     9 *
     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
     24#include <hal_types.h>
     25#include <hal_uspace.h>
    2326#include <vfs.h>
    24 #include <sys-vfs.h>
    25 #include <task.h>
     27#include <vmm.h>
     28#include <errno.h>
     29#include <process.h>
    2630#include <thread.h>
     31#include <printk.h>
    2732
    28 int sys_mkdir (char *pathname, uint_t mode)
     33///////////////////////////////////
     34int sys_mkdir( char     * pathname,
     35               uint32_t   mode )
    2936{
    30         register error_t err = 0;
    31         struct task_s *task = current_task;
    32         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];
    3341
    34         KU_BUFF(ku_path, pathname);
    35         rwlock_rdlock(&task->cwd_lock);
     42        thread_t     * this     = CURRENT_THREAD;
     43        process_t    * process  = this->process;
    3644
    37         if((err = vfs_mkdir(&task->vfs_cwd, &ku_path, mode)))
     45    // check pathname in user space
     46    error = vmm_v2p_translate( false , pathname , &paddr );
     47
     48        if( error )
    3849        {
    39                 current_thread->info.errno = (err < 0) ? -err : err;
    40                 rwlock_unlock(&task->cwd_lock);
     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;
     53                return -1;
     54        }       
     55     
     56    // check fd_array not full
     57        if( process_fd_array_full() )
     58        {
     59        printk("\n[ERROR] in %s : file descriptor array full for process %x\n",
     60               __FUNCTION__ , process->pid );
     61                this->errno = ENFILE;
     62        return -1;
     63        }
     64   
     65    // get pathname length
     66    length = hal_strlen_from_uspace( pathname );
     67
     68    if( length >= CONFIG_VFS_MAX_PATH_LENGTH )
     69    {
     70        printk("\n[ERROR] in %s : pathname too long\n", __FUNCTION__ );
     71                this->errno = ENFILE;
     72        return -1;
     73    }
     74 
     75        // get pathname copy in kernel space
     76    hal_copy_from_uspace( kbuf, pathname, length );
     77
     78    // get cluster and local pointer on reference process
     79    xptr_t      ref_xp  = process->ref_xp;
     80    process_t * ref_ptr = (process_t *)GET_PTR( ref_xp );
     81    cxy_t       ref_cxy = GET_CXY( ref_xp );
     82
     83    // get extended pointer on cwd inode
     84    xptr_t cwd_xp = hal_remote_lwd( XPTR( ref_cxy , &ref_ptr->vfs_cwd_xp ) );
     85   
     86    // get the cwd lock in read mode from reference process
     87        remote_rwlock_rd_lock( XPTR( ref_cxy , &ref_ptr->cwd_lock ) );
     88
     89    // call the relevant VFS function
     90        error = vfs_mkdir( cwd_xp,
     91                       kbuf,
     92                       mode );
     93
     94    // release the cwd lock
     95        remote_rwlock_rd_unlock( XPTR( ref_cxy , &ref_ptr->cwd_lock ) );
     96
     97    if( error )
     98        {
     99        printk("\n[ERROR] in %s : cannot create directory %s\n",
     100               __FUNCTION__ , kbuf );
     101                this->errno = error;
    41102                return -1;
    42103        }
    43104   
    44         rwlock_unlock(&task->cwd_lock);
    45105        return 0;
    46106}
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