source: trunk/kernel/syscalls/sys_chmod.c @ 506

Last change on this file since 506 was 506, checked in by viala@…, 3 years ago

[syscalls] add interface in implementation.

Add const where possible, fix protoypes to follow interface.

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#include <syscalls.h>
33
34//////////////////////////////////
35int sys_chmod( const char * pathname,
36               uint32_t     rights )
37{
38    error_t     error;
39    char        kbuf[CONFIG_VFS_MAX_PATH_LENGTH];
40
41    thread_t  * this    = CURRENT_THREAD;
42    process_t * process = this->process;
43
44    // check pathname length
45    if( hal_strlen_from_uspace( pathname ) >= CONFIG_VFS_MAX_PATH_LENGTH )
46    {
47        printk("\n[ERROR] in %s : pathname too long\n", __FUNCTION__ );
48        this->errno = ENFILE;
49        return -1;
50    }
51
52    // copy pathname in kernel space
53    hal_strcpy_from_uspace( kbuf , pathname , CONFIG_VFS_MAX_PATH_LENGTH );
54
55    // get cluster and local pointer on reference process
56    xptr_t      ref_xp  = process->ref_xp;
57    process_t * ref_ptr = (process_t *)GET_PTR( ref_xp );
58    cxy_t       ref_cxy = GET_CXY( ref_xp );
59
60    // get extended pointer on cwd inode
61    xptr_t cwd_xp = hal_remote_lwd( XPTR( ref_cxy , &ref_ptr->vfs_cwd_xp ) );
62
63    // get the cwd lock in read mode from reference process
64    remote_rwlock_rd_lock( XPTR( ref_cxy , &ref_ptr->cwd_lock ) );
65
66    // call the relevant VFS function
67    error = vfs_chmod( cwd_xp,
68                       kbuf,
69                       rights );
70
71    // release the cwd lock
72    remote_rwlock_rd_unlock( XPTR( ref_cxy , &ref_ptr->cwd_lock ) );
73
74    if( error )
75    {
76        printk("\n[ERROR] in %s : cannot remove directory %s\n",
77               __FUNCTION__ , kbuf );
78        this->errno = error;
79        return -1;
80    }
81
82    return 0;
83
84}  // end sys_chmod()
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