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+## Writing a basic 9P server
+
+On plan 9 the entire system is build around the idea of namespaces
+and that _"everything is a file"_. For this reason it is very easy to write
+a new 9P fileserver in C since all the boring tasks are implemented in
+libraries. This note describes a minimal program which serves a folder to
+`/mnt/hello9p` containing a single synthetic file with the contents "Hello from 9P!".
+
+## The code
+
+ #include <u.h>
+ #include <libc.h>
+ #include <fcall.h>
+ #include <thread.h>
+ #include <9p.h>
+
+ void
+ fsread(Req *r)
+ {
+ readstr(r, "Hello from 9P!\n");
+ respond(r, nil);
+ }
+
+ Srv fs = {
+ .read = fsread,
+ };
+
+ void
+ main(void)
+ {
+ Tree *tree;
+
+ tree = alloctree(nil, nil, DMDIR|0555, nil);
+ fs.tree = tree;
+ createfile(tree->root, "hello", nil, 0555, nil);
+
+ postmountsrv(&fs, nil, "/mnt/hello9p", MREPL | MCREATE);
+ }
+
+## Explanation
+
+The global variable `fs` is a structure which contains function pointers
+to all the 9P handlers, but since I only plan on reading from the file,
+only the `read` field is set. The fsread function calls two helper functions
+from the 9p(2) library which will create a response with the given string as
+the file contents.
+
+In `main` I start by allocating a new file tree, since this 9P server deals with
+a fileserver that has a tree structure, and therefore I don't have to worry
+about how directories are handled for example. A file is added with `createfile`
+to the root of the tree.
+
+The call to `postmountsrv` will mount the 9P server under `/mnt/hello9p`.
+
+## Thats it
+
+This is not very complicated, but see the manpages at 9p(2) and 9pfile(2)
+and intro(5) for more information about the libraries and 9P itself.