openbsd/src/lib/libc/net/res_random.c, branch OPENBSD_6_8_BASEA mirror of https://github.com/libressl/openbsd.git
https://git.lua4.win/openbsd/atom?h=OPENBSD_6_8_BASE2020-07-06T13:33:06+00:00Add support for timeconting in userland.2020-07-06T13:33:06+00:00pirofti2020-07-06T13:33:06+00:00urn:sha1:0320e8b397405d62725b086d54c65caf0669f919
This diff exposes parts of clock_gettime(2) and gettimeofday(2) to
userland via libc eliberating processes from the need for a context
switch everytime they want to count the passage of time.
If a timecounter clock can be exposed to userland than it needs to set
its tc_user member to a non-zero value. Tested with one or multiple
counters per architecture.
The timing data is shared through a pointer found in the new ELF
auxiliary vector AUX_openbsd_timekeep containing timehands information
that is frequently updated by the kernel.
Timing differences between the last kernel update and the current time
are adjusted in userland by the tc_get_timecount() function inside the
MD usertc.c file.
This permits a much more responsive environment, quite visible in
browsers, office programs and gaming (apparently one is are able to fly
in Minecraft now).
Tested by robert@, sthen@, naddy@, kmos@, phessler@, and many others!
OK from at least kettenis@, cheloha@, naddy@, sthen@
Prefer _MUTEX_*LOCK over _THREAD_PRIVATE_MUTEX_*LOCK() when thread-specific2016-04-05T04:29:21+00:00guenther2016-04-05T04:29:21+00:00urn:sha1:503b7f2a3131d0c8321cd43845e068b0e800326b
data isn't necessary.
ok mpi@, ok&tweak natano@
Wrap <resolv.h> so that internal calls go direct2015-10-05T02:57:16+00:00guenther2015-10-05T02:57:16+00:00urn:sha1:8f9432c9662a11c4974baafc30994709db527838
ok millert@
force reseeding if pid has changed.2015-06-04T19:26:39+00:00eric2015-06-04T19:26:39+00:00urn:sha1:3264ecb55a0bdb0ed465192d7fa83ecd99a9998f
ok deraadt@
From ISO/IEC 9899:1999 and 9899:201x,2014-07-20T04:22:34+00:00guenther2014-07-20T04:22:34+00:00urn:sha1:2d32133a5bf876d4d4e5ec6d7a5b28977b043411
6.11.5 - Storage-class specifiers:
The placement of a storage-class specifier other than at the
beginning of the declaration specifiers in a declaration is
an obsolescent feature.
Diff from Jean-Philippe Ouellet (jean-philippe (at) ouellet.biz)
permute15() should be static. Not cranking libc now, because it is2013-11-12T07:00:24+00:00deraadt2013-11-12T07:00:24+00:00urn:sha1:50cfe9e0529a14ae532cfc67e21efa4e79703744
not urgent.
use CLOCK_MONOTONIC, and repair future time_t overflow2013-04-17T03:07:40+00:00deraadt2013-04-17T03:07:40+00:00urn:sha1:e90cc669e9f3289c91c6619aaeae77507fdb9f9c
ok millert guenther
protect the PRG state with a mutex in res_randomid().2013-03-26T17:29:04+00:00eric2013-03-26T17:29:04+00:00urn:sha1:487e58c6d4fb556b7aa0d89e39c11f57db15bdb7
ok deraadt@ guenther@ djm@
Improve the libc DNS resolver ID generation algorithm to be more2008-04-13T00:28:35+00:00djm2008-04-13T00:28:35+00:00urn:sha1:5e750bd35f84420b17ed5842c8d69e716d485360
resistant to prediction atacks by wrapping the existing LCG in a
random permutation generator based on a Luby-Rackoff block cipher.
lots of discussion and final ok deraadt@
ansify. ok deraadt@ moritz@2005-03-25T13:24:12+00:00otto2005-03-25T13:24:12+00:00urn:sha1:2f490723a2e673b2457f65c4b06cacb7d700a3e8