source: trunk/kernel/syscalls/sys_mkdir.c @ 23

Last change on this file since 23 was 23, checked in by alain, 5 years ago

Introduce syscalls.

File size: 3.0 KB
Line 
1/*
2 * sys_mkdir.c - Create a new directory
3 *
4 * Author    Alain Greiner (2016,2017)
5 *
6 * Copyright (c) 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_types.h>
25#include <hal_uspace.h>
26#include <vfs.h>
27#include <vmm.h>
28#include <errno.h>
29#include <process.h>
30#include <thread.h>
31#include <printk.h>
32
33///////////////////////////////////
34int sys_mkdir( char     * pathname,
35               uint32_t   mode )
36{
37        error_t        error;
38    paddr_t        paddr;
39    uint32_t       length;
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 in user space
46    error = vmm_v2p_translate( false , pathname , &paddr );
47
48        if( error )
49        {
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;
102                return -1;
103        }
104   
105        return 0;
106}
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