[Mesa-dev] [Bug 110310] glXQueryServerString is weirdly restrictive

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=110310

            Bug ID: 110310
           Summary: glXQueryServerString is weirdly restrictive
           Product: Mesa
           Version: unspecified
          Hardware: Other
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: medium
         Component: GLX
          Assignee: mesa-dev at lists.freedesktop.org
          Reporter: ajax at nwnk.net
        QA Contact: mesa-dev at lists.freedesktop.org

(This is with reference to src/glx/glxcmds.c; other implementations in the tree
might have similar issues, I haven't checked)

In principle you might want to query GLX_VENDOR_NAMES_EXT if you're trying to
do something clever with glvnd; other strings are imaginable for other possible
extensions. But at the moment the call to __glXQueryServerString is
unreachable, because of the 'default: return NULL;' in the switch statement.
Part of the reason for this is that the `priv->serverXXX` strings are saved in
the GLX display state and are manually freed at shutdown. If we returned
arbitrary strings too, we'd need to track them in a hash table; and once you're
doing that, why not do that for _all_ server strings.

This probably also requires making __glXQueryServerString robust against
getting errors instead of replies.

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