source: trunk/kernel/syscalls/sys_mkfifo.c

Last change on this file 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: 4.2 KB
Line 
1/*
2 * sys_mkfifo.c - creates a named FIFO file.
3 *
4 * Author    Alain Greiner (2016,2017,2018,2019,2020)
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 <hal_kernel_types.h>
25#include <hal_uspace.h>
26#include <printk.h>
27#include <vfs.h>
28#include <process.h>
29#include <thread.h>
30
31////////////////////////////////////
32int sys_mkfifo ( char    * pathname,
33                 uint32_t  mode )
34{
35    vseg_t      * vseg;
36    error_t       error;
37    xptr_t        root_inode_xp;           
38    char          kbuf[CONFIG_VFS_MAX_PATH_LENGTH];
39
40    thread_t    * this    = CURRENT_THREAD;
41    process_t   * process = this->process;
42
43#if DEBUG_SYS_MKFIFO || DEBUG_SYSCALLS_ERROR || CONFIG_INSTRUMENTATION_SYSCALLS
44uint64_t     tm_start = hal_get_cycles();
45#endif
46
47#if DEBUG_SYS_MKFIFO
48if( DEBUG_SYS_MKFIFO < tm_end )
49printk("\n[%s] thread[%x,%x] enter for <%s> / cycle %d\n",
50__FUNCTION__, process->pid, this->trdid, pathname, (uint32_t)tm_start );
51#endif
52 
53    // check pathname in user space
54    if( vmm_get_vseg( process, (intptr_t)pathname , &vseg ) )
55        {
56
57#if DEBUG_SYSCALLS_ERROR
58if( DEBUG_SYSCALLS_ERROR < (uint32_t)tm_start )
59printk("\n[ERROR] in %s : user buffer unmapped %x for thread[%x,%x]\n",
60__FUNCTION__ , (intptr_t)pathname , process->pid, this->trdid );
61#endif
62                this->errno = EINVAL;
63        return -1;
64        }
65
66    // check pathname length
67    if( hal_strlen_from_uspace( pathname ) >= CONFIG_VFS_MAX_PATH_LENGTH )
68    {
69
70#if DEBUG_SYSCALLS_ERROR
71if( DEBUG_SYSCALLS_ERROR < (uint32_t)tm_start )
72printk("\n[ERROR] in %s : pathname too long for thread[%x,%x]\n",
73__FUNCTION__ , process->pid , this->trdid );
74#endif
75        this->errno = ENFILE;
76        return -1;
77    }
78
79    // copy pathname in kernel space
80    hal_strcpy_from_uspace( XPTR( local_cxy , kbuf ),
81                            pathname,
82                            CONFIG_VFS_MAX_PATH_LENGTH );
83
84#if DEBUG_SYS_MKFIFO
85if( DEBUG_SYS_MKFIFO < tm_end )
86printk("\n[%s] thread[%x,%x] enter for <%s> / cycle %d\n",
87__FUNCTION__, process->pid, this->trdid, kbuf, (uint32_t)tm_start );
88#endif
89 
90    // get cluster and local pointer on reference process
91    xptr_t      ref_xp  = process->ref_xp;
92    process_t * ref_ptr = GET_PTR( ref_xp );
93    cxy_t       ref_cxy = GET_CXY( ref_xp );
94
95    // get extended pointer on root inode in path
96    if( kbuf[0] == '/' )                            // absolute path
97    {
98        // use extended pointer on VFS root inode
99        root_inode_xp = process->vfs_root_xp;
100    }
101    else                                            // relative path
102    {
103        // use extended pointer on CWD inode
104        root_inode_xp = hal_remote_l64( XPTR( ref_cxy , &ref_ptr->cwd_xp ) );
105    }
106
107    // call the relevant VFS function
108    error = vfs_mkfifo( root_inode_xp,
109                        kbuf,
110                        mode ); 
111    if( error )
112    {
113
114#if DEBUG_SYSCALLS_ERROR
115if( DEBUG_SYSCALLS_ERROR < (uint32_t)tm_start )
116printk("\n[ERROR] in %s : thread[%x,%x] cannot create node in VFS for <%s> path\n",
117__FUNCTION__ , process->pid , this->trdid , kbuf );
118#endif
119        this->errno = ENFILE;
120        return -1;
121    }
122
123#if (DEBUG_SYS_MKFIFO || CONFIG_INSTRUMENTATION_SYSCALLS)
124uint64_t     tm_end = hal_get_cycles();
125#endif
126
127#if DEBUG_SYS_MKFIFO
128if( DEBUG_SYS_MKFIFO < tm_end )
129printk("\n[%s] thread[%x,%x] exit for <%s> / cycle %d\n",
130__FUNCTION__, process->pid, this->trdid, pathname, (uint32_t)tm_end );
131#endif
132 
133#if CONFIG_INSTRUMENTATION_SYSCALLS
134hal_atomic_add( &syscalls_cumul_cost[SYS_MKFIFO] , tm_end - tm_start );
135hal_atomic_add( &syscalls_occurences[SYS_MKFIFO] , 1 );
136#endif
137
138    return 0;
139
140} // end sys_mkfifo()
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