devfs.cxx

eCos操作系统源码

static int dev_rename   ( cyg_mtab_entry *mte, cyg_dir dir1, const char *name1,
                          cyg_dir dir2, const char *name2 )
{
    return EROFS;
}

// -------------------------------------------------------------------------

static int dev_link     ( cyg_mtab_entry *mte, cyg_dir dir1, const char *name1,
                          cyg_dir dir2, const char *name2, int type )
{
    return EROFS;
}

// -------------------------------------------------------------------------

static int dev_opendir  ( cyg_mtab_entry *mte, cyg_dir dir, const char *name,
                          cyg_file *fte )
{
    return ENOTDIR;
}

// -------------------------------------------------------------------------

static int dev_chdir    ( cyg_mtab_entry *mte, cyg_dir dir, const char *name,
                          cyg_dir *dir_out )
{
    return ENOTDIR;
}

// -------------------------------------------------------------------------

static int dev_stat     ( cyg_mtab_entry *mte, cyg_dir dir, const char *name,
                          struct stat *buf)
{
    Cyg_ErrNo err;
    cyg_io_handle_t handle;

    name -= 5;          // See comment in dev_open()
    
    err = cyg_io_lookup( name, &handle );

    if( err < 0 )
        return -err;

    // Just fill in the stat buffer with some constant values.

    // FIXME: change this when block devices are available
    buf->st_mode = __stat_mode_CHR;     

    buf->st_ino         = (ino_t)handle;    // map dev handle to inode
    buf->st_dev         = 0; // (dev_t)handle;    // same with dev id
    buf->st_nlink       = 0;
    buf->st_uid         = 0;
    buf->st_gid         = 0;
    buf->st_size        = 0;
    buf->st_atime       = 0;
    buf->st_mtime       = 0;
    buf->st_ctime       = 0;
    
    return ENOERR;
}

// -------------------------------------------------------------------------

static int dev_getinfo  ( cyg_mtab_entry *mte, cyg_dir dir, const char *name,
                          int key, void *buf, int len )
{
    return ENOSYS;
}

// -------------------------------------------------------------------------

static int dev_setinfo  ( cyg_mtab_entry *mte, cyg_dir dir, const char *name,
                          int key, void *buf, int len )
{
    return ENOSYS;
}

//==========================================================================
// File operations


// -------------------------------------------------------------------------

static int dev_fo_read      (struct CYG_FILE_TAG *fp, struct CYG_UIO_TAG *uio)
{
    Cyg_ErrNo err = 0;
    int i;

    // Now loop over the iovecs until they are all done, or
    // we get an error.
    for( i = 0; i < uio->uio_iovcnt; i++ )
    {
        cyg_iovec *iov = &uio->uio_iov[i];
        cyg_uint32 len = iov->iov_len;
        cyg_devtab_entry_t *t = (cyg_devtab_entry_t *)fp->f_data;    

        if (t->status & CYG_DEVTAB_STATUS_BLOCK)
            err = cyg_io_bread( (cyg_io_handle_t)t,
                                iov->iov_base,
                                &len, fp->f_offset);
        else
            err = cyg_io_read( (cyg_io_handle_t)t,
                               iov->iov_base,
                               &len);

        if( err < 0 ) break;

        uio->uio_resid -= len;
    }
    
    return -err;
}

// -------------------------------------------------------------------------

static int dev_fo_write     (struct CYG_FILE_TAG *fp, struct CYG_UIO_TAG *uio)
{
    Cyg_ErrNo err = 0;
    int i;

    // Now loop over the iovecs until they are all done, or
    // we get an error.
    for( i = 0; i < uio->uio_iovcnt; i++ )
    {
        cyg_iovec *iov = &uio->uio_iov[i];
        cyg_uint32 len = iov->iov_len;
        cyg_devtab_entry_t *t = (cyg_devtab_entry_t *)fp->f_data;

        if (t->status & CYG_DEVTAB_STATUS_BLOCK)  
            err = cyg_io_bwrite( (cyg_io_handle_t)t,
                                 iov->iov_base,
                                 &len, fp->f_offset);
        else
            err = cyg_io_write( (cyg_io_handle_t)t,
                                iov->iov_base,
                                &len);

        if( err < 0 ) break;

        uio->uio_resid -= len;
    }

    return -err;
}

// -------------------------------------------------------------------------

static int dev_fo_lseek     (struct CYG_FILE_TAG *fp, off_t *pos, int whence )
{
    // All current devices have no notion of position. Just return zero
    // as the new position.

    *pos = 0;
    
    return ENOERR;
}

// -------------------------------------------------------------------------

static int dev_fo_ioctl     (struct CYG_FILE_TAG *fp, CYG_ADDRWORD com,
                             CYG_ADDRWORD data)
{
    return ENOSYS;
}

// -------------------------------------------------------------------------

static cyg_bool dev_fo_select    (struct CYG_FILE_TAG *fp, int which, CYG_ADDRWORD info)
{
    return cyg_io_select( (cyg_io_handle_t)fp->f_data,
                          which,
                          info);
}

// -------------------------------------------------------------------------

static int dev_fo_fsync     (struct CYG_FILE_TAG *fp, int mode )
{
    Cyg_ErrNo err;

    err = cyg_io_get_config((cyg_io_handle_t)fp->f_data,
                            CYG_IO_GET_CONFIG_SERIAL_OUTPUT_DRAIN,
                            NULL, NULL);

    return -err;
}

// -------------------------------------------------------------------------

static int dev_fo_close     (struct CYG_FILE_TAG *fp)
{
    return ENOERR;
}

// -------------------------------------------------------------------------

static int dev_fo_fstat     (struct CYG_FILE_TAG *fp, struct stat *buf )
{
    // Just fill in the stat buffer with some constant values.

    // FIXME: change this when block devices are available
    buf->st_mode = __stat_mode_CHR;     

    buf->st_ino         = (ino_t)fp->f_data;    // map dev handle to inode
    buf->st_dev         = (dev_t)fp->f_data;    // same with dev id
    buf->st_nlink       = 0;
    buf->st_uid         = 0;
    buf->st_gid         = 0;
    buf->st_size        = 0;
    buf->st_atime       = 0;
    buf->st_mtime       = 0;
    buf->st_ctime       = 0;
    
    return ENOERR;
}

// -------------------------------------------------------------------------

static int dev_fo_getinfo   (struct CYG_FILE_TAG *fp, int key, void *buf, int len )
{
    Cyg_ErrNo err = 0;
    cyg_uint32 ll = len;
    
    err = cyg_io_get_config( (cyg_io_handle_t)fp->f_data, key, buf, &ll );
    
    return -err;
}

// -------------------------------------------------------------------------

static int dev_fo_setinfo   (struct CYG_FILE_TAG *fp, int key, void *buf, int len )
{
    Cyg_ErrNo err = 0;
    cyg_uint32 ll = len;
    
    err = cyg_io_set_config( (cyg_io_handle_t)fp->f_data, key, buf, &ll );
    
    return -err;
}

// -------------------------------------------------------------------------
// EOF devfs.cxx