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+A 9p filesystem is supported by the emulator, using a virtio transport. Using
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+it, files can be exchanged with the guest OS, see
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+[`create_file`](docs/api.md#create_filestring-file-uint8array-data-functionobject-callback)
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+and
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+[`read_file`](docs/api.md#read_filestring-file-functionobject-uint8array-callback). It can
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+be enabled by passing the following options to `V86Starter`:
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+
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+```javascript
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+options.filesystem = {
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+ basefs: "http://localhost/9p/fs.json",
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+ baseurl: "http://localhost/9p/base/",
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+}
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+```
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+
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+Here, `basefs` is a json file created using
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+[fs2json](https://github.com/copy/fs2json). The base url is the prefix of a url
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+from which the files are available. For instance, if the 9p filesystem has a
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+file `/bin/sh`, that file must be accessible from
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+`http://localhost/9p/base/bin/sh`. If `basefs` and `baseurl` are omitted, an
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+empty 9p filesystem is created.
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+
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+The `mount_tag` of the 9p device is `host9p`. In order to mount it in the
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+guest, use:
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+
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+```sh
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+mount -t 9p host9p /mnt/9p/
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+```
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