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
RevLine 
[1]1/*
[23]2 * sys_chmod.c - Change file access rights.
[302]3 *
[23]4 * Author    Alain Greiner  (2016,2017)
5 *
[1]6 * Copyright (c) 2015 UPMC Sorbonne Universites
7 *
[23]8 * This file is part of ALMOS-MKH.
[1]9 *
[23]10 * ALMOS-MKH is free software; you can redistribute it and/or modify it
[1]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 *
[23]14 * ALMOS-MKH is distributed in the hope that it will be useful, but
[1]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
[23]20 * along with ALMOS-MKH; if not, write to the Free Software Foundation,
[1]21 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
22 */
23
[457]24#include <hal_kernel_types.h>
[23]25#include <hal_uspace.h>
[1]26#include <vfs.h>
[23]27#include <vmm.h>
28#include <printk.h>
[1]29#include <thread.h>
[23]30#include <process.h>
[1]31
[506]32#include <syscalls.h>
33
[23]34//////////////////////////////////
[506]35int sys_chmod( const char * pathname,
36               uint32_t     rights )
[1]37{
[23]38    error_t     error;
39    char        kbuf[CONFIG_VFS_MAX_PATH_LENGTH];
[1]40
[302]41    thread_t  * this    = CURRENT_THREAD;
42    process_t * process = this->process;
[1]43
[407]44    // check pathname length
45    if( hal_strlen_from_uspace( pathname ) >= CONFIG_VFS_MAX_PATH_LENGTH )
[23]46    {
47        printk("\n[ERROR] in %s : pathname too long\n", __FUNCTION__ );
[302]48        this->errno = ENFILE;
[23]49        return -1;
50    }
51
[407]52    // copy pathname in kernel space
53    hal_strcpy_from_uspace( kbuf , pathname , CONFIG_VFS_MAX_PATH_LENGTH );
54
[23]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 ) );
[302]62
[23]63    // get the cwd lock in read mode from reference process
[302]64    remote_rwlock_rd_lock( XPTR( ref_cxy , &ref_ptr->cwd_lock ) );
[23]65
66    // call the relevant VFS function
[302]67    error = vfs_chmod( cwd_xp,
[23]68                       kbuf,
69                       rights );
70
71    // release the cwd lock
[302]72    remote_rwlock_rd_unlock( XPTR( ref_cxy , &ref_ptr->cwd_lock ) );
[23]73
74    if( error )
[302]75    {
[23]76        printk("\n[ERROR] in %s : cannot remove directory %s\n",
77               __FUNCTION__ , kbuf );
[302]78        this->errno = error;
79        return -1;
80    }
[23]81
[302]82    return 0;
83
84}  // end sys_chmod()
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