source: trunk/kernel/syscalls/sys_close.c @ 463

Last change on this file since 463 was 459, checked in by alain, 6 years ago

Introduce the math library, to support the floating point
data used by the multi-thread fft application.
Fix several bugs regarding the FPU context save/restore.
Introduce support for the %f format in printf.

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//////////////////////////////////
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#if DEBUG_SYS_CLOSE
42uint32_t     tm_start;
43uint32_t     tm_end;
44tm_start = hal_get_cycles();
45if( DEBUG_SYS_CLOSE < tm_start )
46printk("\n[DBG] %s : thread %x in process %x enter / fdid %d / cycle %d\n",
47__FUNCTION__, this->trdid, process->pid, file_id, (uint32_t)tm_start );
48#endif
49 
50    // check file_id argument
51        if( file_id >= CONFIG_PROCESS_FILE_MAX_NR )
52        {
53        printk("\n[ERROR] in %s : illegal file descriptor index = %d\n",
54               __FUNCTION__ , file_id );
55                this->errno = EBADFD;
56                return -1;
57        }
58
59    // get extended pointer on remote file descriptor
60    file_xp = process_fd_get_xptr( process , file_id );
61
62    if( file_xp == XPTR_NULL )
63    {
64        printk("\n[ERROR] in %s : undefined file descriptor = %d\n",
65               __FUNCTION__ , file_id );
66                this->errno = EBADFD;
67                return -1;
68    }
69
70    // call the relevant VFS function
71        error = vfs_close( file_xp , file_id );
72
73        if( error )
74        {
75        printk("\n[ERROR] in %s : cannot close file descriptor = %d\n",
76               __FUNCTION__ , file_id );
77                this->errno = error;
78                return -1;
79        }
80
81        hal_fence();
82
83#if DEBUG_SYS_CLOSE
84tm_end = hal_get_cycles();
85if( DEBUG_SYS_CLOSE < tm_start )
86printk("\n[DBG] %s : thread %x in process %x exit / cost %d / cycle %d\n",
87__FUNCTION__, this->trdid, process->pid, (uint32_t)(tm_end - tm_start), (uint32_t)tm_start );
88#endif
89 
90        return 0;
91}
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