source: trunk/kernel/syscalls/sys_close.c @ 508

Last change on this file since 508 was 506, checked in by viala@…, 6 years ago

[syscalls] add interface in implementation.

Add const where possible, fix protoypes to follow interface.

File size: 2.5 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#include <syscalls.h>
33
34//////////////////////////////////
35int sys_close ( uint32_t file_id )
36{
37    error_t     error;
38    xptr_t      file_xp;
39
40        thread_t  * this    = CURRENT_THREAD;
41        process_t * process = this->process;
42
43#if DEBUG_SYS_CLOSE
44uint32_t     tm_start;
45uint32_t     tm_end;
46tm_start = hal_get_cycles();
47if( DEBUG_SYS_CLOSE < tm_start )
48printk("\n[DBG] %s : thread %x in process %x enter / fdid %d / cycle %d\n",
49__FUNCTION__, this->trdid, process->pid, file_id, (uint32_t)tm_start );
50#endif
51 
52    // check file_id argument
53        if( file_id >= CONFIG_PROCESS_FILE_MAX_NR )
54        {
55        printk("\n[ERROR] in %s : illegal file descriptor index = %d\n",
56               __FUNCTION__ , file_id );
57                this->errno = EBADFD;
58                return -1;
59        }
60
61    // get extended pointer on remote file descriptor
62    file_xp = process_fd_get_xptr( process , file_id );
63
64    if( file_xp == XPTR_NULL )
65    {
66        printk("\n[ERROR] in %s : undefined file descriptor = %d\n",
67               __FUNCTION__ , file_id );
68                this->errno = EBADFD;
69                return -1;
70    }
71
72    // call the relevant VFS function
73        error = vfs_close( file_xp , file_id );
74
75        if( error )
76        {
77        printk("\n[ERROR] in %s : cannot close file descriptor = %d\n",
78               __FUNCTION__ , file_id );
79                this->errno = error;
80                return -1;
81        }
82
83        hal_fence();
84
85#if DEBUG_SYS_CLOSE
86tm_end = hal_get_cycles();
87if( DEBUG_SYS_CLOSE < tm_start )
88printk("\n[DBG] %s : thread %x in process %x exit / cost %d / cycle %d\n",
89__FUNCTION__, this->trdid, process->pid, (uint32_t)(tm_end - tm_start), (uint32_t)tm_start );
90#endif
91 
92        return 0;
93}
Note: See TracBrowser for help on using the repository browser.