source: trunk/kernel/syscalls/sys_unlink.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: 2.4 KB
Line 
1/*
2 * sys_unlink.c - file unlink
3 *
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
23#include <hal_kernel_types.h>
24#include <hal_uspace.h>
25#include <vfs.h>
26#include <process.h>
27#include <thread.h>
28#include <printk.h>
29
30#include <syscalls.h>
31
32//////////////////////////////////
33int sys_unlink ( const char * pathname )
34{
35    error_t   error;
36    char      kbuf[CONFIG_VFS_MAX_PATH_LENGTH];
37
38    thread_t     * this     = CURRENT_THREAD;
39    process_t    * process  = this->process;
40
41    // check pathname length
42    if( hal_strlen_from_uspace( pathname ) >= CONFIG_VFS_MAX_PATH_LENGTH )
43    {
44        printk("\n[ERROR] in %s : pathname too long\n", __FUNCTION__ );
45        this->errno = ENFILE;
46        return -1;
47    }
48
49    // copy pathname in kernel space
50    hal_strcpy_from_uspace( kbuf , pathname , CONFIG_VFS_MAX_PATH_LENGTH );
51
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
57    // get the cwd lock in read mode from reference process
58    remote_rwlock_rd_lock( XPTR( ref_cxy , &ref_ptr->cwd_lock ) );
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    // call relevant VFS function
64    error  = vfs_unlink( cwd_xp , kbuf );
65
66    // release the cwd lock in reference process
67    remote_rwlock_rd_unlock( XPTR( ref_cxy , &ref_ptr->cwd_lock ) );
68
69    if( error )
70    {
71        printk("\n[ERROR] in %s : cannot unlink file/dir %s\n",
72               __FUNCTION__ , pathname );
73        this->errno = ENFILE;
74        return -1;
75    }
76
77    return 0;
78
79} // end sys_unlink()
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