source: trunk/kernel/syscalls/sys_chmod.c @ 457

Last change on this file since 457 was 457, checked in by alain, 3 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: 2.5 KB
Line 
1/*
2 * sys_chmod.c - Change file access rights.
3 *
4 * Author    Alain Greiner  (2016,2017)
5 *
6 * Copyright (c) 2015 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_kernel_types.h>
25#include <hal_uspace.h>
26#include <vfs.h>
27#include <vmm.h>
28#include <printk.h>
29#include <thread.h>
30#include <process.h>
31
32//////////////////////////////////
33int sys_chmod( char    * pathname,
34               uint32_t  rights )
35{
36    error_t     error;
37    char        kbuf[CONFIG_VFS_MAX_PATH_LENGTH];
38
39    thread_t  * this    = CURRENT_THREAD;
40    process_t * process = this->process;
41
42    // check pathname length
43    if( hal_strlen_from_uspace( pathname ) >= CONFIG_VFS_MAX_PATH_LENGTH )
44    {
45        printk("\n[ERROR] in %s : pathname too long\n", __FUNCTION__ );
46        this->errno = ENFILE;
47        return -1;
48    }
49
50    // copy pathname in kernel space
51    hal_strcpy_from_uspace( kbuf , pathname , CONFIG_VFS_MAX_PATH_LENGTH );
52
53    // get cluster and local pointer on reference process
54    xptr_t      ref_xp  = process->ref_xp;
55    process_t * ref_ptr = (process_t *)GET_PTR( ref_xp );
56    cxy_t       ref_cxy = GET_CXY( ref_xp );
57
58    // get extended pointer on cwd inode
59    xptr_t cwd_xp = hal_remote_lwd( XPTR( ref_cxy , &ref_ptr->vfs_cwd_xp ) );
60
61    // get the cwd lock in read mode from reference process
62    remote_rwlock_rd_lock( XPTR( ref_cxy , &ref_ptr->cwd_lock ) );
63
64    // call the relevant VFS function
65    error = vfs_chmod( cwd_xp,
66                       kbuf,
67                       rights );
68
69    // release the cwd lock
70    remote_rwlock_rd_unlock( XPTR( ref_cxy , &ref_ptr->cwd_lock ) );
71
72    if( error )
73    {
74        printk("\n[ERROR] in %s : cannot remove directory %s\n",
75               __FUNCTION__ , kbuf );
76        this->errno = error;
77        return -1;
78    }
79
80    return 0;
81
82}  // end sys_chmod()
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