Interesting topic. This is the Control Socket for XMMS. I'm not C savvy,
but this seems to be implemented in xmms/controlsocket.c, as:
<snip>
saddr.sun_family = AF_UNIX;
g_snprintf(saddr.sun_path, 108, "%s/xmms_%s.%d",
g_get_tmp_dir(), g_get_user_name(), i);
</snip>
The form of this file under /tmp is /xmms_<username>.<id> where `id' is
the number of the XMMS instance (given that you have multiple instances
activated. It's zero-indexed. This is a socket file.
netstat reports no information about this socket, yet lsof reports:
<output>
[EMAIL PROTECTED]:/tmp$ lsof -d /tmp/xmms_jose.*
lsof: WARNING: can't stat() ext3 file system /dev/.static/dev
Output information may be incomplete.
COMMAND PID USER FD TYPE DEVICE SIZE NODE NAME
xmms 12667 jose 4u unix 0xc6124320 12008814 /tmp/xmms_jose.1
</output>
I guess that reading thoroughly controlsocket.c you can tell what really
happens through that socket. I googled around and found several threads
on the XMMS-DEVEL list. Critical was [1]. I think that this socket is
not well-documented, but we can come around with something like:
<proposal>
XMMS uses a standard UDS socket in /tmp/xmms_<username>.n, where n is
your XMMS instance ID (zero-indexed).
Through this socket the users are able to query XMMS status (song
information, actual configuration: reproducing shuffle, normal, etc.,
volume level) and to set several variables, even song title.
Access to the socket information is done through xmmsctrl.h like this:
1. Open a socket and connect it to XMMS's control socket, if possible
2. Send a query or command
3. If a query was sent, read the response (blocking I/O)
4. Read a simple acknowledgement (blocking I/O)
5. Close socket and return result (if any)
This socket is not well documented and is used by the XMMS-Infopipe
plugin. In the future, this socket is going to evolve into a
well-documented API that will be security-enhanced (providing better
authentication control and only item-toggling)
</proposal>
Greetings,
Jose
[1] http://lists.xmms.org/pipermail/xmms-devel/2000-May/001416.html
--
José Parrella > en Debian Etch con Kernel 2.6.14
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