Experimentally, reduces sort -R time of a 148160 line corpus from about
3.15s to about 0.93s on this particular system.
There's probably room for improvement using some digest other than md5, but
I don't want to look at sort(1) anymore. Some discussion of other possible
improvements in the Test Plan section of the Differential.
PR: 230792
Reviewed by: jhb (earlier version)
Differential Revision: https://reviews.freebsd.org/D19885
Bound input file processing length to avoid the issue reported in [1]. For
simplicity, only allow regular file and character device inputs. For
character devices, only allow /dev/random (and /dev/urandom symblink).
32 bytes of random is perfectly sufficient to seed MD5; we don't need any
more. Users that want to use large files as seeds are encouraged to truncate
those files down to an appropriate input file via tools like sha256(1).
(This does not change the sort algorithm of sort -R.)
[1]: https://lists.freebsd.org/pipermail/freebsd-hackers/2018-August/053152.html
PR: 230792
Reported by: Ali Abdallah <aliovx AT gmail.com>
Relnotes: yes
There's no reason to order based on strcmp of ASCII digests instead of
memcmp of the raw digests.
While here, remove collision fallback. If you collide two MD5s, they're
probably the same string anyway. If robustness against MD5 collisions is
desired, maybe we shouldn't use MD5.
None of the behavior of sort -R is specified by POSIX, so we're free to
implement this however we like. E.g., using a 128-bit counter and block cipher
to generate unique indices for each line of input.
PR: 230792 (2/many)
Relnotes: This will change the sort order for a given dataset with a
given seed. Other similarly breaking changes are planned.
Sponsored by: Dell EMC Isilon
Observe:
printf "a\nb\nc\n" > /tmp/foo
# Next command results in no output
cat /tmp/foo | sort -m
# Next command results in proper output
cat /tmp/foo | sort -m -
# Also works:
sort -m /tmp/foo
Some const'ification was done to simplify the actual solution of adding "-"
explicitly to the file list if we didn't have any file arguments left over.
PR: 190099
MFC after: 1 week
Mainly focus on files that use BSD 2-Clause license, however the tool I
was using misidentified many licenses so this was mostly a manual - error
prone - task.
The Software Package Data Exchange (SPDX) group provides a specification
to make it easier for automated tools to detect and summarize well known
opensource licenses. We are gradually adopting the specification, noting
that the tags are considered only advisory and do not, in any way,
superceed or replace the license texts.
No functional change intended.
Worker threads now use a pthread_cond_t to wait for work instead of
burning the cpu up.
Obtained from: DragonflyBSD (07774aea0ccf64a48fcfad8899e3bf7c8f18277a)
MFC after: 2 weeks
zero-length array are dynamically sized at run-time based on the use
of hints, compilers can't be expected to figure out these offsets on
their own. [1]
- Fix incorrect comparison in cmp_nans(). [2]
PR: 204571 [1], 202301 [2]
Submitted by: David Binderman [2]
MFC after: 3 days
Off by default, build behaves normally.
WITH_META_MODE we get auto objdir creation, the ability to
start build from anywhere in the tree.
Still need to add real targets under targets/ to build packages.
Differential Revision: D2796
Reviewed by: brooks imp
Remove useless check for leading blanks in the month name. The
code didn't adjust len after stripping blanks so even if a month
*did* start with a blank we'd end up copying garbage at the end.
Also convert a malloc + memcpy to strdup and fix a memory leak in
the wide char version if mbstowcs() fails.
Originally from Andre Smagin.
Obtained from: OpenBSD (CVS rev. 1.2, 1.3)
MFC after: 1 week
proper way to ensure that the command line compile works the way we intend.
Add explicity DPADD statemens on LIBMD and LIBPTHREAD depending on which
options are used in the build.
Reviewed by: andrew
MFC after: 2 weeks
