User:Tizio/Temp

Random notes

These are random notes I keep for myself. They may not be accurate. They may be completely incorrect. Some of the stuff here will never go to the main namespace. However, if you spot any error, let me know! - Tizio, Caio, Sempronio 17:50, 4 November 2006 (UTC)

To do

 * Definitions of acyclic hypergraph + equivalent condition -> hypergraph
 * Incidence graph -> ??? relative to hidden variables

Links
http://keithp.com/~keithp/talks/

X resources
Looks like "resources" initially mean "windows, etc." (resource manager = the manager that handles the parameters of the resources). At some point, probably because of the name of the file .Xresources, the resources have been considered to be the parameters. Is that correct? Sources?

X Window core protocol and Xlib
The complete trace of a client based on Xlib shows something more than the example in the X Window core protocol. In particular, after requesting the default GC, the library requests (everything is done while executing XOpenDisplay) for the BIG-REQUESTS and XKEYBOARD extensions, and request transfer of the X resources. Exiting, it asks the server for the window having the input focus. Is this specific to a particular Xlib implementation.

If the server support XKB, then Xlib uses it even if not explicitely requested. This feature can be deactivated calling XkbIgnoreExtension before calling XOpenDisplay.

HTTP cookie
Keepalive is somehow relevant (esp. to tracing)

Clarke: even if cookies are not intended to be used, some sites use as an effect of using software libraries that set them up by default.

Kristol reports that the result of a 2001 study, according to which less than 1% of all cookies are rejected by the users' browsers.

Cookies (esp. third-party) allows building anonymous profiles, which contain pages they have visited, but not personal information (check if already explained).

Kristol, page 21: some references for public perception; see also page 31.

Cookie leakage, cookie spoofing

The problem of caching HTTP headers

Notes from the comp.windows.x FAQ
Source:


 * (165) XtAppAddInput can be used to register a function that will be called every time a file descriptor is ready to be read (note that regular files are always ready to be read)
 * (171) When forking, the first thing to do is to close the current connection on the file description given by ConnectionNumber(display); the connection cannot be used anyway (if not using threads); if this is not done, the parent hangs
 * (176) The function in the graphic contexts is calculated over pixel values, not colors; in other words, the function works over indices in the colormap, not the values in the colormap;
 * (185) While the graphic contexts are theoretically usable by other applications, Xlib type GC does not support it;
 * (187) even if the server supports backing store, it may run out of resources at any time, thus stopping maintaining backing store

Loop device

 * cryptoloop
 * other uses (if any)
 * device major/minor (if standard)
 * in OpenBSD and NetBSD it's called vnd
 * lofi in Solaris

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