source: trunk/kernel/syscalls/sys_closedir.c @ 670

Last change on this file since 670 was 670, checked in by alain, 18 months ago

1) Introduce up to 4 command lines arguments in the KSH "load" command.
These arguments are transfered to the user process through the
argc/argv mechanism, using the user space "args" vseg.

2) Introduce the named and anonymous "pipes", for inter-process communication
through the pipe() and mkfifo() syscalls.

3) Introduce the "chat" application to validate the two above mechanisms.

4) Improve printk() and assert() fonctions in printk.c.

File size: 3.2 KB
Line 
1/*
2 * sys_closedir.c - Close an open VFS directory.
3 *
4 * Author    Alain Greiner  (2016,2017,2018,2019,20120)
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 <user_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 user_dir_t structure
39    user_dir_t   * dir_ptr;      // local pointer on user_dir_t structure
40    cxy_t          dir_cxy;      // cluster identifier (inode cluster)
41
42        thread_t  * this    = CURRENT_THREAD;  // client thread
43        process_t * process = this->process;   // client process
44
45#if DEBUG_SYS_CLOSEDIR || DEBUG_SYSCALLS_ERROR || CONFIG_INSTRUMENTATION_SYSCALLS
46uint64_t     tm_start = hal_get_cycles();
47#endif
48
49#if DEBUG_SYS_CLOSEDIR
50if( DEBUG_SYS_CLOSEDIR < tm_start )
51printk("\n[%s] thread[%x,%x] enter for DIR <%x> / cycle %d\n",
52__FUNCTION__, process->pid, this->trdid, dirp, (uint32_t)tm_start );
53#endif
54 
55    // get extended pointer on kernel user_dir_t structure from dirp
56    dir_xp  = user_dir_from_ident( (intptr_t)dirp );
57
58    if( dir_xp == XPTR_NULL )
59        {
60
61#if DEBUG_SYSCALLS_ERROR
62if( DEBUG_SYSCALLS_ERROR < (uint32_t)tm_start )
63printk("\n[ERROR] in %s : thread[%x,%x] / DIR pointer %x not registered\n",
64__FUNCTION__ , process->pid , this->trdid, dirp );
65#endif
66                this->errno = EINVAL;
67                return -1;
68        }       
69
70    // get cluster and local pointer for user_dir_t structure
71    dir_ptr = GET_PTR( dir_xp );
72    dir_cxy = GET_CXY( dir_xp );
73   
74    // delete both user_dir_t structure and dirent array
75    if( dir_cxy == local_cxy )
76    {
77        user_dir_destroy( dir_ptr,
78                          process->ref_xp );
79    }
80    else
81    {
82        rpc_user_dir_destroy_client( dir_cxy,
83                                     dir_ptr,
84                                     process->ref_xp );
85    }
86
87    hal_fence();
88
89#if (DEBUG_SYS_CLOSEDIR || CONFIG_INSTRUMENTATION_SYSCALLS)
90uint64_t     tm_end = hal_get_cycles();
91#endif
92
93#if DEBUG_SYS_CLOSEDIR
94if( DEBUG_SYS_CLOSEDIR < tm_end )
95printk("\n[%s] thread[%x,%x] exit for DIR <%x> / cycle %d\n",
96__FUNCTION__, process->pid, this->trdid, dirp, (uint32_t)tm_end );
97#endif
98 
99#if CONFIG_INSTRUMENTATION_SYSCALLS
100hal_atomic_add( &syscalls_cumul_cost[SYS_CLOSEDIR] , tm_end - tm_start );
101hal_atomic_add( &syscalls_occurences[SYS_CLOSEDIR] , 1 );
102#endif
103
104    return 0;
105
106}  // end sys_closedir()
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