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  1. 31. sij

    S2 Systems joined Cloudflare: Cloudflare is now hiring web browser experts! If you are an engineer in Seattle, and want to get your hands dirty with Chromium, WebAssembly, Typescript, Docker and Terraform - consider applying!

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  2. 25. sij
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  3. proslijedio/la je Tweet
    21. sij

    Someone just implemented slirp4netns with 's netstack. Pretty cool🤩

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  4. 10. sij

    So even more... new pahole runs without vmlinux - it can feed symbols from thin air! (I mean BTF)

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    10. sij

    Multipath TCP (MPTCP) Support Is (Finally) Working Its Upstream - First Bits Landing With 5.6!!

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  6. 10. sij

    Ever wondered how large is struct sk_buff or struck sock? Nothing simpler! $ pahole -C sock src/linux/vmlinux | tail $ pahole -C sk_buff src/linux/vmlinux | tail (as usual, suggested by )

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  7. 6. sij

    Evil job interview puzzle: Write a piece of code, that will "flush()" a network socket on Linux. It should wait (block) until all data from a TCP socket are transmitted and accepted. (hint: this is almost impossible with POSIX sockets API)

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  8. 6. sij

    Blogging takes time and effort; I'm so glad others can enjoy our journey.

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  9. proslijedio/la je Tweet
    2. sij

    Visited ’s Warsaw office today. Thank you for a fun afternoon , , & ! Dziękuję! 🇵🇱

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  10. proslijedio/la je Tweet
    1. sij

    Got 64-bit Debian running on my new rpi4 (a lot harder than it ought to be), so I've accomplished one out of about a dozen tech things I wanted to do over the holidays. Still, better than zero.

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  11. 30. pro 2019.

    It's super hard to do a custom programming language runtime without relying on C. OS Kernel depends on the userspace to have C semantics! Example: Here OS assumes the user has a large stack. Basically - OS requires C in userspace, whether we like it or not

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  12. 30. pro 2019.

    Brilliant articles from about errno and Linux ABI. There is a subtle contract between OS, the Libc, and the programming language runtime. From signals and stack handling (red zone), exception unwinding, to errno and TLS.

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  13. 18. pro 2019.

    Mr Nagle's comment: > Silly window syndrome occurs when the pipe is almost full and the reading end is making tiny reads.

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  14. 18. pro 2019.

    Random TCP trivia: silly window syndrome Wiki has a good description: Basically: - receiver to avoid sending ACK when app received 1 byte - sender to avoid sending packets when app wrote 1 byte

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  15. proslijedio/la je Tweet
    17. pro 2019.
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  16. 17. pro 2019.

    To get all the namespace isolation run (unprivileged): $ unshare -Ur -nmuiC --mount-proc -p --fork I wonder.... can I run docker inside this setup?

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  17. 17. pro 2019.

    Kudos to for digging this up!

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  18. 17. pro 2019.

    A gem I was totally unaware of. Since kernel 4.6 an unprivileged user can create "user namespace" in which a first process has _all_ capabilities. For example you can create network namespace. This sounds super useful for unprivileged network testing.

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  19. 16. pro 2019.

    Fact: socket(AF_INET, SOCK_DGRAM, 0) is identical to socket(PF_PACKET, SOCK_RAW, 0) Which one should you use? The latter:

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  20. proslijedio/la je Tweet
    12. pro 2019.
    Odgovor korisniku/ci

    I did that all the time and found a bug in ext4 by accident.

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