source: trunk/kernel/syscalls/sys_opendir.c @ 1

Last change on this file since 1 was 1, checked in by alain, 5 years ago

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1/*
2 * kern/sys_opendir.c - open a directory
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 <vfs.h>
24#include <sys-vfs.h>
25#include <process.h>
26#include <thread.h>
27#include <spinlock.h>
28
29///////////////////////////////////
30int sys_opendir ( char * pathname )
31{
32        error_t             err;
33        struct vfs_file_s   file;
34        struct ku_obj       ku_path;
35        thread_t          * this    = current_thread;
36        process_t         * process = current_process;
37        uint32_t            fd        = (uint32_t)-1;
38        uint32_t            mode      = 0;
39   
40        if( process_fd_array_full( process ) )
41        {
42                this->info.errno = ENFILE;
43            return fd;
44        }
45
46        KU_BUFF(ku_path, pathname);
47
48        rwlock_rdlock( &process->cwd_lock );
49
50        err = vfs_opendir( &process->vfs_cwd , &ku_path , mode , &file );
51        if( err )
52        {
53                this->info.errno = (err < 0 ) ? -err : err;
54            rwlock_unlock( &process->cwd_lock );
55            return fd;
56        }
57
58        err = process_fd_set( process , &file , &fd);
59        if( err )
60        {
61                vfs_close(&file, NULL);
62                this->info.errno = err;
63        }
64   
65        rwlock_unlock( &process->cwd_lock );
66        return fd;
67}
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