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rt-thread-official/components/dfs/dfs_v2/filesystems/ptyfs/README.md

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The Pseudo Terminal Filesystem

The device register on ptyfs is also registered in device frameworks with rt_device_register().

It's possible to mount a new ptyfs instance on another path. Each instance is isolated to each other. And they don't share the id system. But generally speaking, you have to mount the ptyfs on /dev root, since all the file nodes in ptyfs are devices.