Lmst

Почему функции rand и lrand48 из glibc годятся только для Тетриса: о случайных числах всерьёз

Функцию rand из стандартной библиотеки языка Си для генерации псевдослучайных чисел, наверное, не ругал только ленивый. В довольно известном докладе Rand considered harmful рассказывалось о проблемах с переносимостью, ограниченным диапазоном, многопоточностью, качеством и т.п. Иногда в учебниках упоминают о том, что алгоритм в rand может быть не очень качественным, иметь проблемы с младшими битами, периодом, прохождением статистических тестов. Но крайне редко можно увидеть разбор конкретных критериев, выявляющих дефекты генераторов. В этой статье я постараюсь наглядно показать не просто отдельные недостатки rand , lrand48 и random из glibc, но их полную непригодность для каких-либо вычислений в принципе. Также вы увидите превосходство поточных шифров над minstd , линейным конгруэнтным генератором из 1980-х, не только в качестве, но и в производительности.

https://habr.com/ru/articles/1005118/

#Генераторы_псевдослучайных_чисел #glibc #си #c++ #математическая_статистика #математическое_моделирование #тестирование_по

#linuxfromscratch installation completed

Yes #UEFI is still in BLFS.
That's very very BAD in 2026

The only "big" problem in Chi's run was https://www.linuxfromscratch.org/blfs/view/systemd/postlfs/efivar.html

the patch that's needed so it builds clean with glibc 2.43 can be found here

https://github.com/rhboot/efivar/pull/292.patch

all in all https://linuxfromscratch.org/lfs/view/13.0-systemd-rc1/ seems to be in good shape

#linux #efivar #glibc

GNU Toolchain Office Hours starting soon!

Europe/Americas: Thursday, Feb 19 at 8:00 AM PST / 11:00 AM EST / 16:00 CET

https://gcc.gnu.org/wiki/OfficeHours

#GNUToolchain #OpenSource #GCC #GDB #GLIBC

#TIL: #glibc's resolv.conf has an option, single-request, which disables parallel DNS requests for IPv4/6 and makes them sequential. This is a fix for "DNS servers [that] cannot handle these queries properly".

But, after a bit of digging w/ #wireshark, the issue seems to be that by default glibc makes those parallel requests USING THE SAME UDP SOURCE PORT. 🤦‍♂️ So buggy or overzealous NAT/firewall rules are likely causing the 2nd response to get dropped.

+1 port >> +1 network round trip latency.

#ilovefs #ilovefs26 #ilovefreesoftwareday

Thank you to these Free Software projects I use every day (and to those I know I'm forgetting):
#bash #btrfs #glibc #gnucoreutils #guile #htop #keyd #kitty #labwc #librewolf #man #mvp #python #sudo #tmux #tty-clock #vim #voidlinux #waybar #zathura

Fait intéressant, je viens de mettre à jour #glibc sur Linux Mint :

`sudo dpkg-reconfigure locales`

Snippet :

...
error: Bad entry 'ar_IN '
error: Bad entry 'ar_SS '
error: Bad entry 'en_AG '
error: Bad entry 'en_IL '
error: Bad entry 'en_IN '
error: Bad entry 'en_NG '
error: Bad entry 'en_ZM '
error: Bad entry 'kab_DZ '
ssy_ER.UTF-8.../usr/share/i18n/locales/ssy_ER:109: LC_ADDRESS: syntax error
done
error: Bad entry 'sw_KE '
error: Bad entry 'sw_TZ '
error: Bad entry 'zgh_MA '

Assigning your copyright to the FSF helps defend the GPL and keep software free. Thank you Neal Sidhwaney for assigning your copyright to the FSF! More at: https://u.fsf.org/463 #glibc #Emacs #CopyrightAssignments

📺 @firesidefedi is going live on our self-hosted Owncast server! 📺
Join here: https://stream.firesidefedi.live/

#GNU #FSF #GCC #Glibc #owncast #livestream #selfhosted

GNU C Library (glibc), thư viện nền tảng quan trọng, chuyển từ Sourceware sang hạ tầng CTI của Linux Foundation nhằm thúc đẩy hợp tác mã nguồn mở. #GNU #Glibc #LinuxFoundation #MởNguồn #OpenSource

https://www.reddit.com/r/opensource/comments/1qopjt2/gnu_c_library_moving_from_sourceware_to_linux/

La v20 est envoyée. Ça m’a pris quelques soirs pour vérifier tout. Mais au moins c’est envoyé !

Pour rappel, je souhaite que les options de la ligne de commande soient traduites.

https://patchwork.sourceware.org/project/glibc/list/?series=57054

Alors évidemment Patchwork a reçu le mail no 5 avant la cover letter (oui désolé mon serveur perso est surchargé) donc il a tout cassé. Je devrais attendre plus entre l’envoi des patches de la série.

#glibc #gettext #i18n

GNU C Library 2.43 introduces ISO C23 features, new memory APIs, math optimizations, Unicode 17 updates, and multiple security fixes.
https://linuxiac.com/glibc-2-43-released-with-iso-c23-features-and-performance-improvements/

#gnu #glibc #opensource

#Glibc 2.43 is out:

https://inbox.sourceware.org/libc-alpha/13932477.uLZWGnKmhe@pinacolada/

A few highlights:

* Experimental support for building with #clang has been added.

* [a bunch of ISO C23 stuff]

* Support for mseal and openat2 on #Linux

* Additional optimized and correctly rounded mathematical functions have been imported from the CORE-MATH project […]

* Unicode support has been updated to Unicode 17.0.0.

Screenshot from the top of the linked page

GNU C Library 2.43 đã chính thức ra mắt với việc bổ sung thêm các tính năng C23, cùng hai hàm mới: `mseal` và `openat2`. Bản cập nhật này cải thiện hiệu suất, bảo mật và khả năng tương thích hệ thống cho các ứng dụng C. Đây là bước tiến quan trọng cho các nhà phát triển hệ thống và phần mềm nguồn mở. #glibc #Cprogramming #C23 #openat2 #mseal #lậptrìnhC #GNU #phátriểnthệthống

https://www.reddit.com/r/programming/comments/1ql9c27/gnu_c_library_243_released_with_more_c23_features/

Assigning your copyright to the FSF helps defend the GPL and keep software free. Thank you Neal Sidhwaney for assigning your copyright to the FSF! More at: https://u.fsf.org/463 #glibc #Emacs #CopyrightAssignments