source: trunk/kernel/syscalls/sys_mkfifo.c @ 23

Last change on this file since 23 was 23, checked in by alain, 5 years ago

Introduce syscalls.

File size: 2.9 KB
Line 
1/*
2 * sys_mkfifo.c - creates a named FIFO 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 <hal_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    error_t        error;
36    uint32_t       length;                           // pathname length (bytes)
37    char           kbuf[CONFIG_VFS_MAX_PATH_LENGTH];
38
39    thread_t  * this    = CURRENT_THREAD;
40        process_t * process = this->process;
41
42        if( pathname == NULL )
43        {
44        printk("\n[ERROR] in %s : pathname is NULL\n", __FUNCTION__ );
45                this->errno = EINVAL;
46                return -1;
47        }       
48
49    // check fd_array not full
50        if( process_fd_array_full() )
51        {
52        printk("\n[ERROR] in %s : file descriptor array full for process %x\n",
53               __FUNCTION__ , process->pid );
54                this->errno = ENFILE;
55        return -1;
56        }
57   
58    // get pathname length
59    length = hal_strlen_from_uspace( pathname );
60
61    if( length >= CONFIG_VFS_MAX_PATH_LENGTH )
62    {
63        printk("\n[ERROR] in %s : pathname too long\n", __FUNCTION__ );
64                this->errno = ENFILE;
65        return -1;
66    }
67 
68        // get pathname copy in kernel space
69    hal_copy_from_uspace( kbuf, pathname, length );
70
71    // get cluster and local pointer on reference process
72    xptr_t      ref_xp  = process->ref_xp;
73    process_t * ref_ptr = (process_t *)GET_PTR( ref_xp );
74    cxy_t       ref_cxy = GET_CXY( ref_xp );
75
76    // get extended pointer on cwd inode
77    xptr_t cwd_xp = hal_remote_lwd( XPTR( ref_cxy , &ref_ptr->vfs_cwd_xp ) );
78   
79    // get the cwd lock in read mode from reference process
80        remote_rwlock_rd_lock( XPTR( ref_cxy , &ref_ptr->cwd_lock ) );
81
82    // call the relevant VFS function
83        error = vfs_mkfifo( cwd_xp,
84                        kbuf,
85                        mode );
86
87    // release the cwd lock
88        remote_rwlock_rd_unlock( XPTR( ref_cxy , &ref_ptr->cwd_lock ) );
89
90    if( error )
91        {
92        printk("\n[ERROR] in %s : cannot create named FIFO %s\n",
93               __FUNCTION__ , kbuf );
94                this->errno = error;
95                return -1;
96        }
97   
98        return 0;
99
100} // end sys_mkfifo()
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