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attach, nop - messages to initiate activity

Tnop    tag [2]
Rnop    tag [2]
Tattach tag [2] fid [2] uid [28] aname [28]
Rattach tag [2] fid [2] qid [8]

Description

 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).

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.

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

The tag should be notag (value 16rFFFF) for a nop message.

Entry Points

An attach transaction will be generated for kernel devices (see Inferno Devices in Chapter 2) when a system call evaluates a file name beginning with #. A mount call (see bind, mount, unmount - change file name space in Chapter 8) generates an attach message to the remote file server. When the kernel boots, an attach is made to the root device, root, and then an attach is made to the requested file server machine.

See Also
bind, mount, unmount - change file name space in Chapter 8

Limbo Miscellaneous Modules in Chapter 15

root - the root file system in Chapter 2


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