source: trunk/kernel/syscalls/sys_close.c @ 506

Last change on this file since 506 was 506, checked in by viala@…, 3 years ago

[syscalls] add interface in implementation.

Add const where possible, fix protoypes to follow interface.

File size: 2.5 KB
RevLine 
[1]1/*
[23]2 * sys_close.c  close an open file
[1]3 *
[23]4 * Author    Alain Greiner (2016,2017)
[1]5 *
[23]6 * Copyright (c) UPMC Sorbonne Universites
[1]7 *
[23]8 * This file is part of ALMOS-MKH.
9 *
10 * ALMOS-MKH is free software; you can redistribute it and/or modify it
[1]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 *
[23]14 * ALMOS-MKH is distributed in the hope that it will be useful, but
[1]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
[23]20 * along with ALMOS-MKH; if not, write to the Free Software Foundation,
[1]21 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
22 */
23
[23]24#include <kernel_config.h>
[457]25#include <hal_kernel_types.h>
[23]26#include <hal_special.h>
[1]27#include <vfs.h>
28#include <process.h>
29#include <thread.h>
[23]30#include <printk.h>
[1]31
[506]32#include <syscalls.h>
33
[23]34//////////////////////////////////
35int sys_close ( uint32_t file_id )
[1]36{
[23]37    error_t     error;
38    xptr_t      file_xp;
39
40        thread_t  * this    = CURRENT_THREAD;
41        process_t * process = this->process;
42
[459]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 
[23]52    // check file_id argument
53        if( file_id >= CONFIG_PROCESS_FILE_MAX_NR )
[1]54        {
[23]55        printk("\n[ERROR] in %s : illegal file descriptor index = %d\n",
56               __FUNCTION__ , file_id );
57                this->errno = EBADFD;
[1]58                return -1;
59        }
60
[23]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 )
[1]76        {
[23]77        printk("\n[ERROR] in %s : cannot close file descriptor = %d\n",
78               __FUNCTION__ , file_id );
79                this->errno = error;
[1]80                return -1;
81        }
82
[124]83        hal_fence();
[23]84
[459]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 
[1]92        return 0;
93}
Note: See TracBrowser for help on using the repository browser.