rt-thread/components/libc/dlib/syscall_open.c

/*
 * File      : syscall_open.c
 * This file is part of RT-Thread RTOS
 * COPYRIGHT (C) 2006 - 2015, RT-Thread Development Team
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License along
 *  with this program; if not, write to the Free Software Foundation, Inc.,
 *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Change Logs:
 * Date           Author       Notes
 * 2015-01-28     Bernard      first version
 */

#include <rtthread.h>
#include <yfuns.h>
#ifdef RT_USING_DFS
#include <dfs_posix.h>
#endif

#pragma module_name = "?__open"

int __open(const char *filename, int mode)
{
    if (mode & _LLIO_CREAT)
    {
    }
    
    if (mode & _LLIO_TEXT)
    {
        /* we didn't support text mode */
    }

    switch (mode & _LLIO_RDWRMASK)
    {
  case _LLIO_RDONLY:
    /* The file should be opened for read only. */
    break;

  case _LLIO_WRONLY:
    /* The file should be opened for write only. */
    break;

  case _LLIO_RDWR:
    /* The file should be opened for both reads and writes. */
    break;

  default:
    return -1;
  }

    return handle;
}