source: trunk/kernel/syscalls/sys_mkfifo.c @ 304

Last change on this file since 304 was 304, checked in by max@…, 5 years ago

Style, and use hal_strcpy_from_uspace.

File size: 2.6 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    char           kbuf[CONFIG_VFS_MAX_PATH_LENGTH];
37
38    thread_t  * this    = CURRENT_THREAD;
39    process_t * process = this->process;
40
41    // check fd_array not full
42    if( process_fd_array_full() )
43    {
44        printk("\n[ERROR] in %s : file descriptor array full for process %x\n",
45               __FUNCTION__ , process->pid );
46        this->errno = ENFILE;
47        return -1;
48    }
49
50    // get pathname copy in kernel space
51    error = hal_strcpy_from_uspace( kbuf , pathname , CONFIG_VFS_MAX_PATH_LENGTH );
52
53    if( error )
54    {
55        printk("\n[ERROR] in %s : pathname too long\n", __FUNCTION__ );
56        this->errno = ENFILE;
57        return -1;
58    }
59
60    // get cluster and local pointer on reference process
61    xptr_t      ref_xp  = process->ref_xp;
62    process_t * ref_ptr = (process_t *)GET_PTR( ref_xp );
63    cxy_t       ref_cxy = GET_CXY( ref_xp );
64
65    // get extended pointer on cwd inode
66    xptr_t cwd_xp = hal_remote_lwd( XPTR( ref_cxy , &ref_ptr->vfs_cwd_xp ) );
67
68    // get the cwd lock in read mode from reference process
69    remote_rwlock_rd_lock( XPTR( ref_cxy , &ref_ptr->cwd_lock ) );
70
71    // call the relevant VFS function
72    error = vfs_mkfifo( cwd_xp,
73                        kbuf,
74                        mode );
75
76    // release the cwd lock
77    remote_rwlock_rd_unlock( XPTR( ref_cxy , &ref_ptr->cwd_lock ) );
78
79    if( error )
80    {
81        printk("\n[ERROR] in %s : cannot create named FIFO %s\n",
82               __FUNCTION__ , kbuf );
83        this->errno = error;
84        return -1;
85    }
86
87    return 0;
88
89} // end sys_mkfifo()
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