Ignore:
Timestamp:
Jun 18, 2017, 10:06:41 PM (5 years ago)
Author:
alain
Message:

Introduce syscalls.

File:
1 edited

Legend:

Unmodified
Added
Removed
  • trunk/kernel/syscalls/sys_mkfifo.c

    r1 r23  
    11/*
    2  * kern/sys_mkfifo.c - creates a FIFO named file
     2 * sys_mkfifo.c - creates a named FIFO file.
    33 *
    4  * Copyright (c) 2008,2009,2010,2011,2012 Ghassan Almaless
    5  * Copyright (c) 2011,2012 UPMC Sorbonne Universites
     4 * Author    Alain Greiner (2016,2017)
    65 *
    7  * This file is part of ALMOS-kernel.
     6 * Copyright (c) UPMC Sorbonne Universites
    87 *
    9  * ALMOS-kernel is free software; you can redistribute it and/or modify it
     8 * This file is part of ALMOS-MKH.
     9 *
     10 * ALMOS-MKH is free software; you can redistribute it and/or modify it
    1011 * under the terms of the GNU General Public License as published by
    1112 * the Free Software Foundation; version 2.0 of the License.
    1213 *
    13  * ALMOS-kernel is distributed in the hope that it will be useful, but
     14 * ALMOS-MKH is distributed in the hope that it will be useful, but
    1415 * WITHOUT ANY WARRANTY; without even the implied warranty of
    1516 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     
    1718 *
    1819 * You should have received a copy of the GNU General Public License
    19  * along with ALMOS-kernel; if not, write to the Free Software Foundation,
     20 * along with ALMOS-MKH; if not, write to the Free Software Foundation,
    2021 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
    2122 */
    2223
    23 #include <kdmsg.h>
     24#include <hal_types.h>
     25#include <hal_uspace.h>
     26#include <printk.h>
    2427#include <vfs.h>
    25 #include <sys-vfs.h>
    26 #include <task.h>
     28#include <process.h>
    2729#include <thread.h>
    2830
    29 int sys_mkfifo (char *pathname, uint_t mode)
     31////////////////////////////////////
     32int sys_mkfifo ( char    * pathname,
     33                 uint32_t  mode )
    3034{
    31         register error_t err = 0;
    32         struct task_s *task = current_task;
    33         struct ku_obj ku_path;
     35    error_t        error;
     36    uint32_t       length;                           // pathname length (bytes)
     37    char           kbuf[CONFIG_VFS_MAX_PATH_LENGTH];
    3438
    35         current_thread->info.errno = ENOSYS;
    36         return -1;
     39    thread_t  * this    = CURRENT_THREAD;
     40        process_t * process = this->process;
    3741
    38         KU_BUFF(ku_path, pathname);
    39         rwlock_rdlock(&task->cwd_lock);
    40         if((err = vfs_mkfifo(&task->vfs_cwd, &ku_path, mode)))
     42        if( pathname == NULL )
    4143        {
    42                 printk(INFO, "INFO: sys_mkfifo: Thread %x, CPU %d, Error Code %d\n",
    43                        current_thread,
    44                        cpu_get_id(),
    45                        err);
     44        printk("\n[ERROR] in %s : pathname is NULL\n", __FUNCTION__ );
     45                this->errno = EINVAL;
     46                return -1;
     47        }       
    4648
    47                 rwlock_unlock(&task->cwd_lock);
     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;
    4895                return -1;
    4996        }
    50         rwlock_unlock(&task->cwd_lock);
    5197   
    5298        return 0;
    53 }
     99
     100} // end sys_mkfifo()
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