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\section fishd fishd - Universal variable daemon
\subsection fishd-synopsis Synopsis
<tt>fishd [SECTION]</tt>
\subsection fishd-description Description
The \c fishd daemon is used to load, save and distribute universal
variable information. fish automtically connects to fishd via a socket
on startup. If no instance of fishd is running, fish spawns a new
fishd instance. fishd will create a socket in /tmp, and wait for
incoming connections from universal variable clents, such as fish,
When no clients are connected, fishd will automatically shut down.
\subsection fishd-commands Commands
Fishd works by sending and recieving sommands. Each command is ended
with a newline. These are the commands supported by fishd:
<pre>set KEY:VALUE
set_export KEY:VALUE
</pre>
These commands update the value of a variable. The only difference
between the two is that <tt>set_export</tt>-variables should be
exported to children of the process using them. The variable value may
be escaped using C-style backslash escapes. In fact, this is required
for newline characters, which would otherwise be interpreted as end of
command.
<pre>erase KEY
</pre>
Erase the variable with the specified name.
<pre>barrier
barrier_reply
</pre>
A \c barrier command will result in a barrier_reply beeing added to
the end of the senders queue of unsent messages. These commands are
used to synchronize clients, since once the reply for a barrier
message returns, the sender can know that any updates available at the
time the original barrier request was sent have been recieved.
\subsection fishd-files Files
~/.fishd.HOSTNAME permenent storage location for universal variale
data. The data is stored as a set of \c set and \c set_export commands
such as would be parsed by fishd.
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