diff --git a/components/dfs/dfs_v1/src/dfs_file.c b/components/dfs/dfs_v1/src/dfs_file.c
index f1c4e7ee4d2a..7034b335cc34 100644
--- a/components/dfs/dfs_v1/src/dfs_file.c
+++ b/components/dfs/dfs_v1/src/dfs_file.c
@@ -371,6 +371,15 @@ int dfs_file_close(struct dfs_file *fd)
 /**
  * this function will perform an io control on a file descriptor.
  *
+ * F_GETFL(=3) collides numerically with RT_DEVICE_CTRL_CONFIG, and
+ * F_SETFL(=4) collides with RT_DEVICE_CTRL_CLOSE. Disambiguate by the
+ * POSIX-vs-RT-Thread convention on `args`:
+ *   - F_GETFL (POSIX) ignores args -> caller passes NULL/0. CONFIG needs a
+ *     struct pointer, so args != NULL means RT_DEVICE_CTRL_CONFIG.
+ *   - F_SETFL (POSIX) carries the new flags, so args != NULL means F_SETFL.
+ *     CLOSE needs no args, so args == NULL means RT_DEVICE_CTRL_CLOSE.
+ * The fall-through path (FT_SOCKET / FT_USER / ...) is unchanged.
+ *
  * @param fd the file descriptor.
  * @param cmd the command to send to file descriptor.
  * @param args the argument to send to file descriptor.
@@ -391,8 +400,25 @@ int dfs_file_ioctl(struct dfs_file *fd, int cmd, void *args)
         switch (cmd)
         {
         case F_GETFL:
-            return fd->flags; /* return flags */
+            if (args != RT_NULL && fd->vnode->fops != RT_NULL && fd->vnode->fops->ioctl != RT_NULL)
+            {
+                /* args != NULL: treat cmd=3 as RT_DEVICE_CTRL_CONFIG and forward
+                 * to the driver with the supplied config struct. */
+                return fd->vnode->fops->ioctl(fd, cmd, args);
+            }
+            else
+            {
+                /* args == NULL: POSIX F_GETFL, return current fd flags. */
+                return fd->flags; /* return flags */
+            }
         case F_SETFL:
+            if (args == RT_NULL && fd->vnode->fops != RT_NULL && fd->vnode->fops->ioctl != RT_NULL)
+            {
+                /* args == NULL: treat cmd=4 as RT_DEVICE_CTRL_CLOSE and forward
+                 * to the driver. */
+                return fd->vnode->fops->ioctl(fd, cmd, args);
+            }
+            else
             {
                 int flags = (int)(rt_base_t)args;
                 int mask  = O_NONBLOCK | O_APPEND;
diff --git a/components/dfs/dfs_v2/filesystems/devfs/devfs.c b/components/dfs/dfs_v2/filesystems/devfs/devfs.c
index 38e9a2e4550f..c7dcc02ca14c 100644
--- a/components/dfs/dfs_v2/filesystems/devfs/devfs.c
+++ b/components/dfs/dfs_v2/filesystems/devfs/devfs.c
@@ -228,6 +228,44 @@ static int dfs_devfs_ioctl(struct dfs_file *file, int cmd, void *args)
         if ((file->dentry->pathname[0] == '/') && (file->dentry->pathname[1] == '\0'))
             return -RT_ENOSYS;
 
+        /* Disambiguate F_GETFL(=3)/F_SETFL(=4) vs RT_DEVICE_CTRL_CONFIG(=3)/
+         * RT_DEVICE_CTRL_CLOSE(=4) by args nullness. POSIX ignores args on
+         * F_GETFL (caller passes NULL/0) and carries the new flags on
+         * F_SETFL (args != NULL); the RTT cmds take a non-NULL struct
+         * pointer on CONFIG and no args on CLOSE. */
+        if (cmd == F_GETFL)
+        {
+            if (args != RT_NULL)
+            {
+                /* args != NULL: treat cmd=3 as RT_DEVICE_CTRL_CONFIG and
+                 * fall through to the driver/device. */
+            }
+            else
+            {
+                /* args == NULL: POSIX F_GETFL, return current fd flags. */
+                return file->flags;
+            }
+        }
+        else if (cmd == F_SETFL)
+        {
+            if (args == RT_NULL)
+            {
+                /* args == NULL: treat cmd=4 as RT_DEVICE_CTRL_CLOSE and
+                 * fall through to the driver/device. */
+            }
+            else
+            {
+                /* args != NULL: POSIX F_SETFL, update fd flags in place. */
+                int flags = (int)(rt_base_t)args;
+                int mask  = O_NONBLOCK | O_APPEND;
+
+                flags &= mask;
+                file->flags &= ~mask;
+                file->flags |= flags;
+                return RT_EOK;
+            }
+        }
+
 #ifdef RT_USING_POSIX_DEVIO
         if (device->fops && device->fops->ioctl)
         {
diff --git a/components/dfs/dfs_v2/src/dfs_file.c b/components/dfs/dfs_v2/src/dfs_file.c
index 970b74c6caee..f32fff71c70c 100644
--- a/components/dfs/dfs_v2/src/dfs_file.c
+++ b/components/dfs/dfs_v2/src/dfs_file.c
@@ -1722,7 +1722,16 @@ int dfs_file_fcntl(int fd, int cmd, unsigned long arg)
             file->mode = arg;
             break;
         case F_GETFL:
-            ret = file->flags;
+            if (arg != RT_NULL && file->fops != RT_NULL && file->fops->ioctl != RT_NULL)
+            {
+                /* cmd=3 with args != NULL: treat as RT_DEVICE_CTRL_CONFIG and forward to the driver with the config struct. */
+                ret = file->fops->ioctl(file, cmd, (void *)(rt_base_t)arg);
+            }
+            else
+            {
+                /* args == NULL: POSIX F_GETFL, return current fd flags. */
+                ret = file->flags;
+            }
             break;
         case F_SETFL:
         {
@@ -1739,6 +1748,12 @@ int dfs_file_fcntl(int fd, int cmd, unsigned long arg)
 #endif
                         O_APPEND | O_NONBLOCK;
 
+            if (arg == RT_NULL && file->fops != RT_NULL && file->fops->ioctl != RT_NULL)
+            {
+                /* cmd=4 with args == NULL: treat as RT_DEVICE_CTRL_CLOSE and forward to the driver. */
+                ret = file->fops->ioctl(file, cmd, (void *)(rt_base_t)arg);
+                break;
+            }
             flags &= mask;
             if (file->vnode->type == FT_SOCKET && file->fops != RT_NULL &&
                 file->fops->ioctl != RT_NULL)