H.2 Miscellaneous Xlib Changes
A new type, XPointer
, has been defined to
replace caddr_t
, which is not a standard type and is
therefore not necessarily portable. (The type
XtPointer
was added to the X11R4 X Toolkit for the
same reason.) An XPointer
is a
typedef
for a char *
, and occurs
most noticeably in the XrmValue
and
XrmOptionDescRec
structures.
The X11R5 distribution installs the file
XKeysymDB
in /usr/lib/X11. This
file contains a list of vendor-private keysyms names and their
corresponding values. It is required for the correct operation of many
Motif applications and any application that wants to make use of
vendor-specific keys on a keyboard. This file was in the X11R4
distribution, but was not installed by default.
A new function, XFlushGC()
, forces Xlib to
write its cached GC changes to the X server. For efficiency, Xlib
combines multiple GC changes into a single server request whenever
multiple changes to a GC occur before a use of that GC. It is possible
for extensions to X to use GCs in ways that Xlib is not aware of, and
this can mean that requests made by the extension client library may not
operate with the expected contents of the GC.
XFlushGC()
is provided to address this
problem.
The XErrorEvent
structure used by Xlib contains only 32 bits of data specific to the error, which is usually used to return a resource ID. This is sufficient for all core X errors, but may not be enough for extensions (notably PEX). There is plenty of room in the protocol error structure ...
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