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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  <^> <-> 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 (\ \),

   diaeresis (\ \), and ogonek (\ \).



## 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.