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# libX11 - Core X11 protocol client library
Documentation for this library can be found in the included man pages,
and in the Xlib spec from the specs subdirectory, also available at:
- https://www.x.org/releases/current/doc/libX11/libX11/libX11.html
- https://www.x.org/releases/current/doc/libX11/libX11/libX11.pdf
and the O'Reilly Xlib books, which they have made freely available online,
though only for older versions of X11:
- X Series Volume 2: Xlib Reference Manual (1989, covers X11R3)
https://www.archive.org/details/xlibretmanver1102nyemiss
- X Series Volume 2: Xlib Reference Manual, 2nd Edition (1990, covers X11R4)
https://www.archive.org/details/xlibrefmanv115ed02nyemiss
All questions regarding this software should be directed at the
Xorg mailing list:
https://lists.x.org/mailman/listinfo/xorg
The primary development code repository can be found at:
https://gitlab.freedesktop.org/xorg/lib/libX11
Please submit bug reports and requests to merge patches there.
For patch submission instructions, see:
https://www.x.org/wiki/Development/Documentation/SubmittingPatches
## Release 1.8.3
* Improved handling of reentering libX11 via X*IfEvent() calls (!171, !173)
* Fix loading of en_US.UTF-8/XLC_LOCALE (#167, !174)
* Add XFreeThreads() and automatic call from a destructor function when
thread-safety-constructor is enabled (!167).
* Address issues found by UBSan and AddressSanitizer
* Fix build with older gcc versions (!169)
## Release 1.8.2
* Allow X*IfEvent() to reenter libX11 to avoid deadlock from unsafe
calls when thread-safety-constructor is enabled (!150).
* Remove Xlib's pthread function stubs - instead use system provided
threads functions, including linking against any needed pthread
libraries if thread-safety-constructor is enabled (!155, !156).
* Fix off-by-one error in XKeycodeToKeysym for indexes > 3 (!78).
* Allow XNSpotLocation with OnTheSpot (!127).
* Fix Win32 build when -fno-common is in effect (!140).
* Fix memory leak in XRegisterIMInstantiateCallback (!158).
* Add compose sequences for the double-struck capitals ℕ ℤ ℚ ℝ ℂ (!144),
the Samogitian E with dot above and macron (!147), Unicode minus sign (!163).
* Change <Compose> <^> <-> to mean superscript minus instead of macron (!162).
* Delete compose sequences that mix top-row digits with numpad digits (!139)
or mix upper & lower case letters (!144).
* Delete some unuseful compose sequences meant for Bépo layout (!146).
* Delete compose sequences using leftcaret & rightcaret keysyms (!163).
* Remove KOI8-R character set from en_US.UTF-8/XLC_LOCALE (!148).
* Map sr locales to sr_RS compose files (!161).
## Release 1.8.1
* Fix --enable-thread-safety-constructor configure option
## Release 1.8
* Add --enable-thread-safety-constructor configure option (default: enabled)
to call XInitThreads() from the library's constructor, thus enabling
thread-safety and locking by default. This may expose bugs in clients
which did not follow documented rules for calling libX11 functions.
* Fix Ethopian (am_ET.UTF-8) compose sequences.
* Remove 8 compose sequences that generated the input symbols.
* Add compose seuences for abovedot (\<period\> \<space\>),
diaeresis (\<quotedbl\> \<space\>), and ogonek (\<semicolon\> \<space\>).
## Release 1.7.5
* Avoids a segfault when an invalid name is used for opening a display.
## Release 1.7.4
* Fixes the "Unknown sequence number" error by allowing backward jumps
in the sequence number when widening it.
* Any changes to virtual modifiers get propagated properly.
* Greek case-conversion tables were updated to Unicode Data 14.0.
* Compose sequences for ☮ 🄯 ⇐ ⇑ ⇓ were added,
being the following: OY, ()), =<, =^, and =v.
* Hammer-and-sickle can be composed with question mark plus backslash.
## Release 1.7.3
* Fixes a hanging issue in _XReply() where the replying thread would
wait for an event when another thread was already waiting for one.
* Avoids a crash when the X connection gets broken while closing down.
## Release 1.7.2
This is a bug fix release, correcting a regression introduced by and
improving the checks from the fix for CVE-2021-31535.
## Release 1.7.1
This is a bug fix release, including a security fix for
CVE-2021-31535, nls and documentation corrections.
* Reject string longer than USHRT_MAX before sending them on the wire
* Fix out-of-bound access in KeySymToUcs4()
* nls: allow composing all breved letters also with a lowercase "u"
* nls: add 'C.utf8' as an alias for 'en_US.UTF-8'
* Nroff code fixes
* Comments fixes
## Release 1.7.0
Version 1.7.0 includes a new API, hence the change from the 1.6 series
to 1.7:
* XSetIOErrorExitHandler which provides a mechanism for applications
to recover from I/O error conditions instead of being forced to
exit. Thanks to Carlos Garnacho for this.
This release includes a bunch of bug fixes, some of which have been
pending for over three years:
* A bunch of nls cleanups to remove obsolete entries and clean up
formatting of the list. Thanks to Benno Schulenberg for these.
* Warning fixes and other cleanups across a huge swath of the
library. Thanks to Alan Coopersmith for these.
* Memory allocation bugs, including leaks and use after free in the
locale code. Thanks to Krzesimir Nowak, Jacek Caban and Vittorio
Zecca for these.
* Thread safety fixes in the locale code. Thanks to Jacek Caban for
these.
* poll_for_response race condition fix. Thanks to Frediano Ziglio for
the bulk of this effort, and to Peter Hutterer for careful review
and improvements.
Version 1.7.0 includes a couple of new locales:
* ia and ie locales. Thanks to Carmina16 for these.
There are also numerous compose entries added, including:
* |^ or ^| for ↑, |v or v| for ↓, ~~ for ≈. Thanks to Antti
Savolainen for this.
* Allowing use of 'v' for caron, in addition to 'c', so things like
vC for Č, vc for č. Thanks to Benno Schulenberg for this.
* Compose sequences LT, lt for '<', and GT, gt for '>' for keyboards
where those are difficult to access. Thanks to Jonathan Belsewir
for this.
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