source: trunk/kernel/syscalls/sys_unlink.c @ 579

Last change on this file since 579 was 566, checked in by alain, 6 years ago

Complete restructuration of kernel locks.

File size: 2.4 KB
RevLine 
[1]1/*
[23]2 * sys_unlink.c - file unlink
[305]3 *
[1]4 * Copyright (c) 2008,2009,2010,2011,2012 Ghassan Almaless
5 * Copyright (c) 2011,2012 UPMC Sorbonne Universites
6 *
7 * This file is part of ALMOS-kernel.
8 *
9 * ALMOS-kernel is free software; you can redistribute it and/or modify it
10 * under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; version 2.0 of the License.
12 *
13 * ALMOS-kernel is distributed in the hope that it will be useful, but
14 * WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
16 * General Public License for more details.
17 *
18 * 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 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
21 */
22
[457]23#include <hal_kernel_types.h>
[23]24#include <hal_uspace.h>
[1]25#include <vfs.h>
[23]26#include <process.h>
[1]27#include <thread.h>
[23]28#include <printk.h>
[1]29
[506]30#include <syscalls.h>
31
[23]32//////////////////////////////////
[566]33int sys_unlink ( char * pathname )
[1]34{
[305]35    error_t   error;
[23]36    char      kbuf[CONFIG_VFS_MAX_PATH_LENGTH];
[1]37
[305]38    thread_t     * this     = CURRENT_THREAD;
39    process_t    * process  = this->process;
[23]40
[407]41    // check pathname length
42    if( hal_strlen_from_uspace( pathname ) >= CONFIG_VFS_MAX_PATH_LENGTH )
[23]43    {
44        printk("\n[ERROR] in %s : pathname too long\n", __FUNCTION__ );
[305]45        this->errno = ENFILE;
[23]46        return -1;
47    }
48
[407]49    // copy pathname in kernel space
50    hal_strcpy_from_uspace( kbuf , pathname , CONFIG_VFS_MAX_PATH_LENGTH );
51
[23]52    // get cluster and local pointer on reference process
53    xptr_t      ref_xp  = process->ref_xp;
54    process_t * ref_ptr = (process_t *)GET_PTR( ref_xp );
55    cxy_t       ref_cxy = GET_CXY( ref_xp );
56
[566]57    // get the cwd lock in write mode from reference process
58    remote_rwlock_wr_acquire( XPTR( ref_cxy , &ref_ptr->cwd_lock ) );
[23]59
60    // get extended pointer on cwd inode
[566]61    xptr_t cwd_xp = hal_remote_l64( XPTR( ref_cxy , &ref_ptr->vfs_cwd_xp ) );
[23]62
63    // call relevant VFS function
64    error  = vfs_unlink( cwd_xp , kbuf );
65
66    // release the cwd lock in reference process
[566]67    remote_rwlock_wr_release( XPTR( ref_cxy , &ref_ptr->cwd_lock ) );
[23]68
[305]69    if( error )
70    {
[23]71        printk("\n[ERROR] in %s : cannot unlink file/dir %s\n",
72               __FUNCTION__ , pathname );
[305]73        this->errno = ENFILE;
74        return -1;
75    }
[23]76
[305]77    return 0;
[23]78
79} // end sys_unlink()
Note: See TracBrowser for help on using the repository browser.