source: trunk/kernel/syscalls/sys_closedir.c @ 611

Last change on this file since 611 was 611, checked in by alain, 3 years ago

Introduce sigificant modifs in VFS to support the <ls> command,
and the . and .. directories entries.

File size: 2.6 KB
Line 
1/*
2 * sys_closedir.c - Close an open VFS directory.
3 *
4 * Author    Alain Greiner  (2016,2017,2018)
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 <vfs.h>
27#include <printk.h>
28#include <thread.h>
29#include <process.h>
30#include <remote_dir.h>
31#include <errno.h>
32#include <syscalls.h>
33#include <shared_syscalls.h>
34
35///////////////////////////////
36int sys_closedir ( DIR * dirp )
37{
38    xptr_t         dir_xp;       // extended pointer on remote_dir_t structure
39
40        thread_t  * this    = CURRENT_THREAD;  // client thread
41        process_t * process = this->process;   // client process
42
43#if (DEBUG_SYS_CLOSEDIR || CONFIG_INSTRUMENTATION_SYSCALLS)
44uint64_t     tm_start = hal_get_cycles();
45#endif
46
47#if DEBUG_SYS_CLOSEDIR
48if( DEBUG_SYS_CLOSEDIR < tm_start )
49printk("\n[%s] thread[%x,%x] enter for DIR <%x> / cycle %d\n",
50__FUNCTION__, process->pid, this->trdid, dirp, (uint32_t)tm_start );
51#endif
52 
53    // get extended pointer on kernel remote_dir_t structure from dirp
54    dir_xp  = remote_dir_from_ident( (intptr_t)dirp );
55
56    if( dir_xp == XPTR_NULL )
57        {
58
59#if DEBUG_SYSCALLS_ERROR
60printk("\n[ERROR] in %s / thread[%x,%x] : DIR pointer %x not registered\n",
61__FUNCTION__ , process->pid , this->trdid, dirp );
62#endif
63                this->errno = EINVAL;
64                return -1;
65        }       
66
67    // delete kernel remote_dir_t structure
68    remote_dir_destroy( dir_xp );
69
70    hal_fence();
71
72#if (DEBUG_SYS_CLOSEDIR || CONFIG_INSTRUMENTATION_SYSCALLS)
73uint64_t     tm_end = hal_get_cycles();
74#endif
75
76#if DEBUG_SYS_CLOSEDIR
77if( DEBUG_SYS_CLOSEDIR < tm_end )
78printk("\n[%s] thread[%x,%x] exit for DIR <%x> / cycle %d\n",
79__FUNCTION__, process->pid, this->trdid, dirp, (uint32_t)tm_end );
80#endif
81 
82#if CONFIG_INSTRUMENTATION_SYSCALLS
83hal_atomic_add( &syscalls_cumul_cost[SYS_CLOSEDIR] , tm_end - tm_start );
84hal_atomic_add( &syscalls_occurences[SYS_CLOSEDIR] , 1 );
85#endif
86
87    return 0;
88
89}  // end sys_closedir()
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