source: trunk/kernel/syscalls/sys_mkdir.c @ 459

Last change on this file since 459 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: 2.7 KB
Line 
1/*
2 * sys_mkdir.c - Create a new directory in file system.
3 *
4 * Author    Alain Greiner (2016,2017)
5 *
6 * Copyright (c) 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 <errno.h>
29#include <process.h>
30#include <thread.h>
31#include <printk.h>
32
33///////////////////////////////////
34int sys_mkdir( char     * pathname,
35               uint32_t   mode )
36{
37    error_t        error;
38    char           kbuf[CONFIG_VFS_MAX_PATH_LENGTH];
39
40    thread_t     * this     = CURRENT_THREAD;
41    process_t    * process  = this->process;
42
43    // check fd_array not full
44    if( process_fd_array_full() )
45    {
46        printk("\n[ERROR] in %s : file descriptor array full for process %x\n",
47               __FUNCTION__ , process->pid );
48        this->errno = ENFILE;
49        return -1;
50    }
51
52    // check pathname length
53    if( hal_strlen_from_uspace( pathname ) >= CONFIG_VFS_MAX_PATH_LENGTH )
54    {
55        printk("\n[ERROR] in %s : pathname too long\n", __FUNCTION__ );
56        this->errno = ENFILE;
57        return -1;
58    }
59
60    // copy pathname in kernel space
61    hal_strcpy_from_uspace( kbuf , pathname , CONFIG_VFS_MAX_PATH_LENGTH );
62
63    // get cluster and local pointer on reference process
64    xptr_t      ref_xp  = process->ref_xp;
65    process_t * ref_ptr = (process_t *)GET_PTR( ref_xp );
66    cxy_t       ref_cxy = GET_CXY( ref_xp );
67
68    // get extended pointer on cwd inode
69    xptr_t cwd_xp = hal_remote_lwd( XPTR( ref_cxy , &ref_ptr->vfs_cwd_xp ) );
70
71    // get the cwd lock in read mode from reference process
72    remote_rwlock_rd_lock( XPTR( ref_cxy , &ref_ptr->cwd_lock ) );
73
74    // call the relevant VFS function
75    error = vfs_mkdir( cwd_xp,
76                       kbuf,
77                       mode );
78
79    // release the cwd lock
80    remote_rwlock_rd_unlock( XPTR( ref_cxy , &ref_ptr->cwd_lock ) );
81
82    if( error )
83    {
84        printk("\n[ERROR] in %s : cannot create directory %s\n",
85               __FUNCTION__ , kbuf );
86        this->errno = error;
87        return -1;
88    }
89
90    return 0;
91}
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