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Plan 9 - man page for attach (plan9 section 5)

ATTACH(5)			       File Formats Manual				ATTACH(5)

       attach, session, nop - messages to initiate activity

       Tnop	 tag[2]
       Rnop	 tag[2]

       Tsession  tag[2] chal[8]
       Rsession  tag[2] chal[8] authid[28] authdom[48]

       Tattach	 tag[2] fid[2] uid[28] aname[28] ticket[72] auth[13]
       Rattach	 tag[2] fid[2] qid[8] rauth[13]

       The  nop request does nothing overt but may be used to synchronize the channel between two
       service hosts initially.

       The session request is used to initialize a connection between a client and a server.  All
       outstanding  I/O  on  the  connection  is  aborted.   The  set of messages between session
       requests is called a session.  The host's user name (authid) and its authentication domain
       (authdom)  identify  the  key  to be used when authenticating to this host.  The exchanged
       challenges (chal) are used in the authentication algorithm.  If authid is a null string no
       authentication is performed in this session.

       The tag should be NOTAG (value 0xFFFF) for a nop or session message.

       The  attach  message serves as a fresh introduction from a user on the client machine to a
       server.	The message identifies the user (uid) and may select  the  file  tree  to  access
       (aname).   The  ticket  and  auth  arguments  contains authorization data derived from the
       exchanged challenges of the session message; see auth(6).

       As a result of the attach transaction, the client will  have  a	connection  to	the  root
       directory  of  the  desired file tree, represented by fid.  An error is returned if fid is
       already in use.	The server's idea of the root of the file  tree  is  represented  by  the
       returned qid.

       An  attach  transaction	will be generated for kernel devices (see intro(3)) when a system
       call evaluates a file name beginning with Pipe(2) generates an attach on the kernel device
       pipe(3).   The  mount system call (see bind(2)) generates an attach messages to the remote
       file server.  When the kernel boots, an attach is made to the root  device,  root(3),  and
       then an attach is made to the requested file server machine.



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