source: trunk/kernel/syscalls/sys_close.c @ 457

Last change on this file since 457 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: 2.0 KB
Line 
1/*
2 * sys_close.c  close an open file
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 <kernel_config.h>
25#include <hal_kernel_types.h>
26#include <hal_special.h>
27#include <vfs.h>
28#include <process.h>
29#include <thread.h>
30#include <printk.h>
31
32//////////////////////////////////
33int sys_close ( uint32_t file_id )
34{
35    error_t     error;
36    xptr_t      file_xp;
37
38        thread_t  * this    = CURRENT_THREAD;
39        process_t * process = this->process;
40
41    // check file_id argument
42        if( file_id >= CONFIG_PROCESS_FILE_MAX_NR )
43        {
44        printk("\n[ERROR] in %s : illegal file descriptor index = %d\n",
45               __FUNCTION__ , file_id );
46                this->errno = EBADFD;
47                return -1;
48        }
49
50    // get extended pointer on remote file descriptor
51    file_xp = process_fd_get_xptr( process , file_id );
52
53    if( file_xp == XPTR_NULL )
54    {
55        printk("\n[ERROR] in %s : undefined file descriptor = %d\n",
56               __FUNCTION__ , file_id );
57                this->errno = EBADFD;
58                return -1;
59    }
60
61    // call the relevant VFS function
62        error = vfs_close( file_xp , file_id );
63
64        if( error )
65        {
66        printk("\n[ERROR] in %s : cannot close file descriptor = %d\n",
67               __FUNCTION__ , file_id );
68                this->errno = error;
69                return -1;
70        }
71
72        hal_fence();
73
74        return 0;
75}
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