source: trunk/kernel/syscalls/sys_close.c @ 594

Last change on this file since 594 was 594, checked in by alain, 3 years ago

Fix various bugs in sys_stat() and sys_mmap() functions.
Improve debug in other functions.

File size: 2.8 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 || CONFIG_INSTRUMENTATION_SYSCALLS)
44uint64_t     tm_start = hal_get_cycles();
45#endif
46
47#if DEBUG_SYS_CLOSE
48if( DEBUG_SYS_CLOSE < tm_start )
49printk("\n[%s] thread[%x,%x] enter / fdid %d / cycle %d\n",
50__FUNCTION__, process->pid, this->trdid, file_id, (uint32_t)tm_start );
51#endif
52 
53    // check file_id argument
54        if( file_id >= CONFIG_PROCESS_FILE_MAX_NR )
55        {
56        printk("\n[ERROR] in %s : illegal file descriptor index = %d\n",
57               __FUNCTION__ , file_id );
58                this->errno = EBADFD;
59                return -1;
60        }
61
62    // get extended pointer on remote file descriptor
63    file_xp = process_fd_get_xptr( process , file_id );
64
65    if( file_xp == XPTR_NULL )
66    {
67
68#if DEBUG_SYSCALLS_ERROR
69printk("\n[ERROR] in %s : undefined file descriptor %d\n",
70__FUNCTION__ , file_id );
71#endif
72        this->errno = EBADFD;
73                return -1;
74    }
75
76    // call the relevant VFS function
77        error = vfs_close( file_xp , file_id );
78
79        if( error )
80        {
81
82#if DEBUG_SYSCALLS_ERROR
83printk("\n[ERROR] in %s : cannot close file descriptor %d\n",
84__FUNCTION__ , file_id );
85#endif
86                this->errno = error;
87                return -1;
88        }
89
90        hal_fence();
91
92#if (DEBUG_SYS_CLOSE || CONFIG_INSTRUMENTATION_SYSCALLS)
93uint64_t     tm_end = hal_get_cycles();
94#endif
95
96#if DEBUG_SYS_CLOSE
97tm_end = hal_get_cycles();
98if( DEBUG_SYS_CLOSE < tm_start )
99printk("\n[%s] thread[%x,%x] exit / cycle %d\n",
100__FUNCTION__, process->pid, this->trdid, (uint32_t)tm_end );
101#endif
102 
103#if CONFIG_INSTRUMENTATION_SYSCALLS
104hal_atomic_add( &syscalls_cumul_cost[SYS_CLOSE] , tm_end - tm_start );
105hal_atomic_add( &syscalls_occurences[SYS_CLOSE] , 1 );
106#endif
107
108        return 0;
109}
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