RT-Thread-使用 RT_USING_POSIX finsh能显示，但不能输入RT-Thread问答社区

使用 RT_USING_POSIX finsh能显示，但不能输入

发布于 2018-03-09 10:48:12 浏览：4748 订阅该版

* 本帖最后由 moebius.ever 于 2018-3-9 11:28 编辑 *

有类似的问题，[https://www.rt-thread.org/qa/for ... thread&tid=5603](https://www.rt-thread.org/qa/forum.php?mod=viewthread&tid=5603)
只不过现在RT_USING_DFS宏变成RT_USING_POSIX了，使用的是stm32f405vg的片子，用的stm32f429-apollo模板修改来的。
具体表现为，进入rt_init_thread_entry

[indent]void rt_init_thread_entry(void* parameter)[/indent][indent]{  [/indent][indent]  /* initialization RT-Thread Components */[/indent][indent]  #ifdef RT_USING_COMPONENTS_INIT[/indent][indent]  rt_components_init();[/indent]进入rt_components_init()

void rt_components_init(void)
{
#if RT_DEBUG_INIT
    int result;
    const struct rt_init_desc *desc;
    rt_kprintf("do components intialization.<br>");
    for (desc = &__rt_init_desc_rti_board_end; desc < &__rt_init_desc_rti_end; desc ++)
    {
        rt_kprintf("initialize %s", desc->fn_name);
        result = desc->fn();
        rt_kprintf(":%d done<br>", result);</div><div> 
   }

通过result = desc->fn();进入，使用的newlib/stdio.c

[indent]int libc_system_init(void)[/indent][indent]{[/indent][indent]#if defined(RT_USING_DFS) & defined(RT_USING_DFS_DEVFS)[/indent][indent]    rt_device_t dev_console;
    dev_console = rt_console_get_device();[/indent][indent]   if (dev_console)[/indent][indent]    {[/indent][indent]    #if defined(RT_USING_POSIX)[/indent][indent]        libc_stdio_set_console(dev_console->parent.name, O_RDWR);[/indent][indent]    #else[/indent][indent]        libc_stdio_set_console(dev_console->parent.name, O_WRONLY);[/indent][indent]    #endif[/indent][indent]    }[/indent][indent]#endif[/indent]进入libc_stdio_set_console(dev_console->parent.name, O_RDWR); 
[indent]int libc_stdio_set_console(const char* device_name, int mode)[/indent][indent]{[/indent][indent]   FILE *fp;[/indent][indent]    char name[STDIO_DEVICE_NAME_MAX];[/indent][indent]    char *file_mode;
    snprintf(name, sizeof(name) - 1, "/dev/%s", device_name);[/indent][indent]    name[STDIO_DEVICE_NAME_MAX - 1] = '\0';
    if (mode == O_RDWR) file_mode = "r+";[/indent][indent]    else if (mode == O_WRONLY) file_mode = "wb";[/indent][indent]    else if (mode == O_RDONLY) file_mode = "rb";
    fp = fopen(name, file_mode);[/indent][indent]    if (fp)[/indent][indent]    {[/indent][indent]        setvbuf(fp, NULL, _IONBF, 0);[/indent]进入 fopen，然后进入，_fopen_r，这个函数没有c代码，然后进入_open_r, 使用的是newlib/syscall.c
int

[indent]_open_r(struct _reent *ptr, const char *file, int flags, int mode)[/indent][indent]{[/indent][indent]#ifndef RT_USING_DFS[/indent][indent]    return 0;[/indent][indent]#else[/indent][indent]    int rc;

[/indent][indent]    rc = open(file, flags, mode);[/indent][indent]    return rc;[/indent][indent]#endif[/indent][indent]}[/indent]进入 open，使用的是dfs_posix.c

[indent]int open(const char *file, int flags, ...)[/indent][indent]{[/indent][indent]    int fd, result;[/indent][indent]   struct dfs_fd *d;[/indent][indent]    /* allocate a fd */[/indent][indent]    fd = fd_new();[/indent][indent]    if (fd < 0)[/indent][indent]    {[/indent][indent]        rt_set_errno(-ENOMEM);
        return -1;[/indent][indent]    }[/indent][indent]    d = fd_get(fd);
    result = dfs_file_open(d, file, flags);[/indent][indent]    if (result < 0)[/indent][indent]    {[/indent][indent]        /* release the ref-count of fd */[/indent][indent]        fd_put(d);[/indent][indent]        fd_put(d);
        rt_set_errno(result);
        return -1;[/indent][indent]    }
    /* release the ref-count of fd */[/indent][indent]    fd_put(d);
    return fd;[/indent][indent]}[/indent]进入

int dfs_file_open(struct dfs_fd *fd, const char *path, int flags)
[indent]{[/indent][indent]    struct dfs_filesystem *fs;[/indent][indent]    char *fullpath;[/indent][indent]    int result;[/indent][indent]    /* parameter check */[/indent][indent]    if (fd == NULL)[/indent][indent]        return -EINVAL;
    /* make sure we have an absolute path */[/indent][indent]    fullpath = dfs_normalize_path(NULL, path);[/indent][indent]    if (fullpath == NULL)[/indent][indent]    {[/indent][indent]        return -ENOMEM;[/indent][indent]    }
    dbg_log(DBG_LOG, "open file:%s<br>", fullpath);
    /* Check whether file is already open */[/indent][indent]    if (fd_is_open(fullpath) == 0)[/indent][indent]    {[/indent][indent]        rt_free(fullpath); /* release path */
        return -EBUSY;[/indent][indent]    }
    /* find filesystem */[/indent][indent]    fs = dfs_filesystem_lookup(fullpath);[/indent][indent]    if (fs == NULL)[/indent][indent]    {[/indent][indent]       rt_free(fullpath); /* release path */
        return -ENOENT;[/indent][indent]    }
    dbg_log(DBG_LOG, "open in filesystem:%s<br>", fs->ops->name);[/indent][indent]    fd->fops  = fs->ops->fops; /* set file ops */
    /* initialize the fd item */[/indent][indent]    fd->type  = FT_REGULAR;[/indent][indent]    fd->flags = flags;[/indent][indent]    fd->size  = 0;[/indent][indent]    fd->pos   = 0;[/indent][indent]    fd->data  = fs;[/indent][indent]    if (!(fs->ops->flags & DFS_FS_FLAG_FULLPATH))[/indent][indent]    {[/indent][indent]        if (dfs_subdir(fs->path, fullpath) == NULL)[/indent][indent]            fd->path = rt_strdup("/");[/indent][indent]        else[/indent][indent]            fd->path = rt_strdup(dfs_subdir(fs->path, fullpath));[/indent][indent]        rt_free(fullpath);[/indent][indent]        dbg_log(DBG_LOG, "Actual file path: %s<br>", fd->path);[/indent][indent]    }[/indent][indent]    else[/indent][indent]    {[/indent][indent]        fd->path = fullpath;</div><div>    }
    /* specific file system open routine */[/indent][indent]    if (fd->fops->open == NULL)[/indent][indent]    {[/indent][indent]        /* clear fd */[/indent][indent]        rt_free(fd->path);[/indent][indent]        fd->path = NULL;
        return -ENOSYS;[/indent][indent]    }[/indent][indent]   if ((result = fd->fops->open(fd)) < 0)[/indent][indent]    {[/indent][indent]        /* clear fd */[/indent][indent]        rt_free(fd->path);[/indent]进入
[indent]static int serial_fops_open(struct dfs_fd *fd)[/indent][indent]{[/indent][indent]    rt_err_t ret = 0;[/indent][indent]    rt_uint16_t flags = 0;[/indent][indent]    rt_device_t device;
    device = (rt_device_t)fd->data;[/indent][indent]    RT_ASSERT(device != RT_NULL);
    switch (fd->flags & O_ACCMODE)[/indent][indent]    {[/indent][indent]    case O_RDONLY:[/indent][indent]        dbg_log(DBG_LOG, "fops open: O_RDONLY!<br>");[/indent][indent]        flags = RT_DEVICE_FLAG_INT_RX | RT_DEVICE_FLAG_RDONLY;[/indent][indent]        break;[/indent][indent]    case O_WRONLY:[/indent][indent]        dbg_log(DBG_LOG, "fops open: O_WRONLY!<br>");[/indent][indent]        flags = RT_DEVICE_FLAG_WRONLY;[/indent][indent]        break;[/indent][indent]    case O_RDWR:[/indent][indent]        dbg_log(DBG_LOG, "fops open: O_RDWR!<br>");[/indent][indent]        flags = RT_DEVICE_FLAG_INT_RX | RT_DEVICE_FLAG_RDWR;[/indent][indent]        break;[/indent][indent]    default:[/indent][indent]        dbg_log(DBG_ERROR, "fops open: unknown mode - %d!<br>", fd->flags & O_ACCMODE);[/indent][indent]        break;[/indent][indent]    }
    if ((fd->flags & O_ACCMODE) != O_WRONLY)[/indent][indent]        rt_device_set_rx_indicate(device, serial_fops_rx_ind);[/indent][indent]    ret = rt_device_open(device, flags);[/indent][indent]    if (ret == RT_EOK) return 0;[/indent][indent]    return ret;[/indent][indent]}[/indent]进入
[indent]rt_err_t rt_device_open(rt_device_t dev, rt_uint16_t oflag)[/indent][indent]{[/indent][indent]    rt_err_t result = RT_EOK;[/indent][indent]    RT_ASSERT(dev != RT_NULL);[/indent][indent]    /* if device is not initialized, initialize it. */[/indent][indent]    if (!(dev->flag & RT_DEVICE_FLAG_ACTIVATED))[/indent][indent]    {[/indent][indent]        if (dev->init != RT_NULL)[/indent][indent]        {[/indent][indent]            result = dev->init(dev);[/indent][indent]            if (result != RT_EOK)[/indent][indent]            {[/indent][indent]                rt_kprintf("To initialize device:%s failed. The error code is %d<br>",[/indent][indent]                           dev->parent.name, result);[/indent][indent]                return result;[/indent][indent]            }[/indent][indent]        }[/indent][indent]
        dev->flag |= RT_DEVICE_FLAG_ACTIVATED;[/indent][indent]    }[/indent][indent]
    /* device is a stand alone device and opened */[/indent][indent]    if ((dev->flag & RT_DEVICE_FLAG_STANDALONE) &&[/indent][indent]        (dev->open_flag & RT_DEVICE_OFLAG_OPEN))[/indent][indent]    {[/indent][indent]        return -RT_EBUSY;[/indent][indent]    }[/indent][indent]    /* call device open interface */[/indent][indent]    if (dev->open != RT_NULL)[/indent][indent]    {[/indent][indent]       result = dev->open(dev, oflag);[/indent]进入

[indent]static rt_err_t rt_serial_open(struct rt_device *dev, rt_uint16_t oflag)[/indent][indent]    rt_uint16_t stream_flag = 0;[/indent][indent]    struct rt_serial_device *serial;[/indent][indent]
    RT_ASSERT(dev != RT_NULL);[/indent][indent]    serial = (struct rt_serial_device *)dev;[/indent][indent]
    dbg_log(DBG_LOG, "open serial device: 0x%08x with open flag: 0x%04x<br>",[/indent][indent]        dev, oflag);[/indent][indent]    /* check device flag with the open flag */[/indent][indent]    if ((oflag & RT_DEVICE_FLAG_DMA_RX) && !(dev->flag & RT_DEVICE_FLAG_DMA_RX))[/indent][indent]        return -RT_EIO;[/indent][indent]    if ((oflag & RT_DEVICE_FLAG_DMA_TX) && !(dev->flag & RT_DEVICE_FLAG_DMA_TX))[/indent][indent]        return -RT_EIO;[/indent][indent]    if ((oflag & RT_DEVICE_FLAG_INT_RX) && !(dev->flag & RT_DEVICE_FLAG_INT_RX))[/indent][indent]        return -RT_EIO;[/indent][indent]    if ((oflag & RT_DEVICE_FLAG_INT_TX) && !(dev->flag & RT_DEVICE_FLAG_INT_TX))[/indent][indent]        return -RT_EIO;
    /* keep steam flag */[/indent][indent]    if ((oflag & RT_DEVICE_FLAG_STREAM) || (dev->open_flag & RT_DEVICE_FLAG_STREAM))[/indent][indent]        stream_flag = RT_DEVICE_FLAG_STREAM;[/indent]在此处返回 -RT_EIO, oflag的值为 0x103， dev->flag的值为 0xa13，无论怎么修改libc_stdio_set_console(dev_console->parent.name, O_RDWR);的参数，这一句都执行不过去。感觉是不是个bug啊。