如何关闭已经打开所有文件

发布于 2021-11-18 17:50:27 浏览：884 订阅该版

3 个回答

liuduanfei 2021-11-18

这家伙很懒，什么也没写！

```c
int list_fd(void)
{
    int index;
    struct dfs_fdtable *fd_table;

fd_table = dfs_fdtable_get();
    if (!fd_table) return -1;

rt_enter_critical();

rt_kprintf("fd type    ref magic  path\n");
    rt_kprintf("-- ------  --- ----- ------\n");
    for (index = 0; index < (int)fd_table->maxfd; index ++)
    {
        struct dfs_fd *fd = fd_table->fds[index];

if (fd && fd->fops)
        {
            rt_kprintf("%2d ", index + DFS_FD_OFFSET);
            if (fd->type == FT_DIRECTORY)    rt_kprintf("%-7.7s ", "dir");
            else if (fd->type == FT_REGULAR) rt_kprintf("%-7.7s ", "file");
            else if (fd->type == FT_SOCKET)  rt_kprintf("%-7.7s ", "socket");
            else if (fd->type == FT_USER)    rt_kprintf("%-7.7s ", "user");
            else if (fd->type == FT_DEVICE)   rt_kprintf("%-7.7s ", "device");
            else rt_kprintf("%-8.8s ", "unknown");
            rt_kprintf("%3d ", fd->ref_count);
            rt_kprintf("%04x  ", fd->magic);
            if (fd->path)
            {
                rt_kprintf("%s\n", fd->path);
            }
            else
            {
                rt_kprintf("\n");
            }
        }
    }
    rt_exit_critical();

return 0;
}
MSH_CMD_EXPORT(list_fd, list file descriptor);
```

从这个函数找一些灵感吧。