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#+STARTUP: indent showall -*- org -*-
* 0.3.0 - <2012-08-13 Mon>
This release is is heavily based on the work of Miloslav Trmač
<mitr@redhat.com>, many thanks for his contributions!
** API/ABI breaking changes
*** The library was split into two variants
There is now an LD_PRELOAD variant (libumberlog_preload.so), and a
library applications can link to. The former has overrides for the
syslog() family of functions, the latter does not.
See the documentation on what other differences there are between the
two!
*** The LOG_UL_NODISCOVER flag was renamed to LOG_UL_NOIMPLICIT
The term "discover" wasn't entirely clear, and did not correctly
reflect what goes on anyway. For this reason, it was renamed to
LOG_UL_NOIMPLICIT.
*** New function: ul_set_log_flags()
Instead of being able to set flags via (ul_)openlog(), all flags must
be set from this version forward with ul_set_log_flags().
The LD_PRELOAD variant will ship with all flags enabled by default, so
that automatically discovered fields can be added implicitly.
*** Settings and caches are now per-process, not per-thread
Settings formerly set via ul_openlog() and cached values were
thread-local before, they are now per-process, to mimic the original
syslog() family more closely.
*** Further syslog() compatibility enhancements
The ul_closelog() function does not clear the previously set flags, to
be in line with how the original closelog() works.
** Features
*** Performance improvements
Significant performance improvements and internal code cleanups have
been made, resulting in some cases over 20% speed ups.
*** Support for a wider range of format strings
On glibc-based platforms, the library now uses parse_printf_format(),
to support a far wider range of format strings than the old code
did. On other platforms, the old code is still used - but has received
improvements too.
** Bugfixes
*** Fixed a 1-byte heap overflow in ul_buffer_initialize
*** Don't use \f in JSON, use \uNNNN instead
Some parsers - notably json-c - do not recognise \f, so fall back to
\uNNNN instead.
*** Timestamp formatting has been fixed
*** Log mask handling has also been fixed
Previously, if the mask was not a pure priority mask, the library did
not handle it appropriately.
* 0.2.1 - <2012-05-02 Wed>
** Fixed JSON formatting for syslog() messages
In version 0.2.0, when converting to formatting the JSON output
ourselves, a bug creeped in that made the library emit invalid JSON
when used as an LD_PRELOAD-ed library.
This has been corrected.
** Facility and priority values are handled properly
In all versions of the library the facility and priority handling was
broken for all but the most trivial cases. This version fixes this
issue aswell.
** Previous openlog() settings are cleared at closelog() time
In all former versions of the library, openlog() collected a set of
information that was then used by all other functions, even after
closelog() was called.
Closing the log should return us to the default state, so we now wrap
closelog() too, and the library resets its settings to their default.
** Noticable performance increase
The library was changed to try and do less memory allocations, and
reuse memory instead of a malloc/free cycle. This results in a
noticable performance increase under heavy load.
* 0.2.0 - <2012-04-16 Mon>
** Remove the json-c dependency
The library used very little from the features of json-c, as all we
did was append key-value pairs, where both key and value were always
strings. No nesting, no other funky stuff. It's easier to do this
directly, without having to build a separate object and then serialize
it into a string.
For this reason, the json-c dependency was removed, and the library
does the JSON formatting itself. However, json-c is still required for
the test suite, but not otherwise.
The result is a more compact JSON, and noticably increased speed.
* 0.1.2 - <2012-04-08 Sun>
** Portability fixes
Up until now, the library abused that passing va_list around without
copying works on various architectures. On others, that does not.
To remedy the issue, the library now parses format strings itself, and
copies va_list. This makes it work on all architectures, independent
on the internal implementation of va_list, and preserves both API and
ABI.
* 0.1.1 - <2012-04-02 Mon>
** Override __syslog_chk, even when compiled without fortification
In the first release, the library only exported and overridden
__syslog_chk function if it was compiled with fortification
enabled. This resulted in the library not working as expected on
systems where fortification was enabled (such as Debian and Fedora).
This release corrects that issue, and even by default, with
fortification disabled, the built library will work as expected on all
supported systems.
* 0.1.0 - <2012-03-26 Mon>
Initial release.
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