fs: remove _POSIX_C_SOURCE defining #32460

pull fanquake wants to merge 1 commits into bitcoin:master from fanquake:posix_c_source changing 2 files +0 −18
  1. fanquake commented at 3:01 pm on May 9, 2025: member

    On Linux systems, _POSIX_C_SOURCE will default to 200809L (since glibc 2.10). There’s currently no reason for us to undefine it, and then set it to an earlier value. Also tested with musl libc.

    I think if anything, the project should be settings macros like _POSIX_C_SOURCE, globally.

  2. DrahtBot commented at 3:02 pm on May 9, 2025: contributor

    The following sections might be updated with supplementary metadata relevant to reviewers and maintainers.

    Code Coverage & Benchmarks

    For details see: https://corecheck.dev/bitcoin/bitcoin/pulls/32460.

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  3. laanwj commented at 3:59 pm on May 9, 2025: member

    From what I can tell, compilers on Linux systems, will be defining _GNU_SOURCE, which results in glibc defining _POSIX_C_SOURCE to 200809L; so undefining it, and setting it to an earlier value does not seem like the correct behaviour for us, or even required

    Yes, there is never a valid reason to set it to a lower value. The idea of the macro is to tell the header files “i know about POSIX version X and want to use it”.

    Usually this is defined by the build system, or at most at the top of specific implementation files, defining them in a header that’s included by other stuff is really strange. Edit: oh it’s defined in a cpp, that’s fine really. But unnecessary apparently otherwise this wouldn’t compile.

  4. laanwj added the label Utils/log/libs on May 9, 2025
  5. luke-jr commented at 11:54 am on May 14, 2025: member

    From what I can tell, compilers on Linux systems, will be defining _GNU_SOURCE

    _GNU_SOURCE isn’t supposed to ever be defined by default, and I don’t see us defining it anywhere…?

  6. laanwj commented at 7:59 am on May 15, 2025: member

    _GNU_SOURCE isn’t supposed to ever be defined by default, and I don’t see us defining it anywhere…?

    Not sure when it became that way, but it seems to be set by default, just compile anything using g++ (first thought was it related to C++ standard, but it isn’t):

    0#include <iostream>
1
2int main()
3{
4    std::cout << _GNU_SOURCE << std::endl;
5    std::cout << _POSIX_C_SOURCE << std::endl;
6    return 0;
7}

    0$ g++ --version
1g++ (Ubuntu 13.3.0-6ubuntu2~24.04) 13.3.0
2$ g++ test.cpp  -o test
3$ ./test
41
5200809

    One thing i’m not sure about is if this is true on all the BSDs.

    Then again, the removed code is explicitly __linux__ so that doesn’t matter for this PR.

  7. hebasto commented at 2:11 pm on May 16, 2025: member

    From what I can tell, compilers on Linux systems, will be defining _GNU_SOURCE

    _GNU_SOURCE isn’t supposed to ever be defined by default, and I don’t see us defining it anywhere…?

    Do we use GNU extensions?

  8. laanwj commented at 12:34 pm on May 19, 2025: member

    Do we use GNU extensions?

    No, we don’t.

  9. laanwj approved
  10. laanwj commented at 12:35 pm on May 19, 2025: member
    ACK 0574aeaf6608dc3e118a4d2c0613dab2097cf62e
  11. hebasto commented at 2:45 pm on May 19, 2025: member

    From what I can tell, compilers on Linux systems, will be defining _GNU_SOURCE…

    Is this behaviour documented? If not, why rely on incidental behaviour that might change?

    … which results in glibc defining _POSIX_C_SOURCE to 200809L…

    I don’t see any causality here: passing -U_GNU_SOURCE to an arbitrary compiler on my machine still results in _POSIX_C_SOURCE being set to 200809L.

  12. laanwj commented at 8:37 am on May 20, 2025: member

    i think _GNU_SOURCE is a bit of a red herring here. The point here is that modern versions of g++/glibc on Linux set _POSIX_SOURCE high enough by default to be able to use posix_fallocate (a POSIX function, not a GNU extension function) out of the box, so there’s no more reason to set it explicitly.

    i couldn’t find this behavior explicitly documented anywhere, but i’m sure a lot of software relies on that by now.

  13. hebasto commented at 8:46 am on May 20, 2025: member

    i think _GNU_SOURCE is a bit of a red herring here. The point here is that modern versions of g++/glibc on Linux set _POSIX_SOURCE high enough by default to be able to use posix_fallocate out of the box, so there’s no more reason to set it explicitly.

    Then maybe remove _GNU_SOURCE mentioning from the PR description?

  14. fanquake force-pushed on May 20, 2025
  15. hebasto approved
  16. hebasto commented at 1:24 pm on May 20, 2025: member
    ACK db895c0e38427ce73167ef325f5731a3c4805598.
  17. DrahtBot requested review from laanwj on May 20, 2025
  18. maflcko commented at 1:50 pm on May 20, 2025: member
    I wonder if there is a platform without posix_fallocate (outside of macos and windows). If not, the fallback can probably be fully removed, along with the detection and it can just be assumed to be always present?
  19. fanquake commented at 2:56 pm on May 20, 2025: member 
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  20. hebasto commented at 3:41 pm on May 20, 2025: member

    My Guix build:

     0aarch64
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  21. maflcko commented at 8:05 am on May 21, 2025: member

    I wonder if there is a platform without posix_fallocate (outside of macos and windows). If not, the fallback can probably be fully removed, along with the detection and it can just be assumed to be always present?

    I am asking, because the fallback was just the normal code in the beginning (bba89aa82a80f0373dcb7288d96d5b0fcb453d73) and was not removed in 288fdc092aff9d7e0cea159196b2e96044a786c7.

    However, even bioniC has posix_fallocate since API level 21 (https://android.googlesource.com/platform/bionic/+/master/docs/status.md). And the other slimmer libcs may not have ftruncate (https://www.sourceware.org/newlib/libc.html), so they can’t be used anyway. (I haven’t checked if https://www.fefe.de/dietlibc/exports or uClibc or klibc can be used, but if there is no mention of them and no steps to reproduce or a CI task, then I wonder why we should consider them supported)

    Removing the fallback would make review easier here, because if the code compiles, it is more likely to be correct.

  22. maflcko commented at 8:15 am on May 21, 2025: member

    And the other slimmer libcs may not have ftruncate (https://www.sourceware.org/newlib/libc.html), so they can’t be used anyway.

    Actually, it is used in #31425, so I wonder how that compiles and links. I guess it will start failing once more than a trivial dummy code is linked.

  23. laanwj commented at 11:12 am on May 21, 2025: member

    Removing the fallback would make review easier here, because if the code compiles, it is more likely to be correct.

    Oof. That is a good point. i hadn’t realized that the detection will just make this compile even if posix_fallocate doesn’t end up being available, so it might result in a hidden performance regression instead of just a compile error.

    Scrapping my ACK for now, sorry.

  24. fanquake force-pushed on May 21, 2025
  25. fanquake commented at 11:57 am on May 21, 2025: member
    I’ve added another commit (that can be squashed), dropping the fallback.
  26. in src/util/fs_helpers.cpp:206 in d400536a8d outdated 
    199@@ -211,24 +200,8 @@ void AllocateFileRange(FILE* file, unsigned int offset, unsigned int length)
200     }
201     ftruncate(fileno(file), static_cast<off_t>(offset) + length);
202 #else
203-#if defined(HAVE_POSIX_FALLOCATE)
204-    // Version using posix_fallocate
205     off_t nEndPos = (off_t)offset + length;
206     if (0 == posix_fallocate(fileno(file), 0, nEndPos)) return;
    laanwj commented at 12:38 pm on May 21, 2025:
    Maybe (void)posix_fallocate(fileno(file), 0, nEndPos) to make ignoring the return value explicit.
  27. laanwj commented at 12:45 pm on May 21, 2025: member
    OpenBSD (as of 7.4): has no posix_fallocate, but does have ftruncate https://github.com/PointCloudLibrary/pcl/pull/5957/files FreeBSD (as of 8.3): has posix_fallocate: https://man.freebsd.org/cgi/man.cgi?query=posix_fallocate&sektion=2&manpath=FreeBSD+8.3-RELEASE NetBSD (as of 7.0): has it : https://man.netbsd.org/NetBSD-7.0/posix_fallocate.2
  28. maflcko commented at 2:39 pm on May 21, 2025: member

    so it might result in a hidden performance regression instead of just a compile error.

    I’d guess on modern, fast storage this doesn’t make a visible difference. (Would be good to double check)

    Then, given that the fallback seems to be needed by OpenBSD and newlibc (possibly others), it may be better to keep it?

    Ref: https://github.com/hebasto/bitcoin-core-nightly/actions/runs/15163923250/job/42638498492?pr=54#step:6:361 (OpenBSD 7.7):

    0src/util/fs_helpers.cpp:204:14: error: use of undeclared identifier 'posix_fallocate'
1    if (0 == posix_fallocate(fileno(file), 0, nEndPos)) return;
2             ^
31 error generated.
  29. fs: remove _POSIX_C_SOURCE defining 
    On Linux systems, `_POSIX_C_SOURCE` will default to `200809L` (since
glibc 2.10). There's currently no reason for us to undefine it, and then
set it to an earlier value. Also tested with musl libc.

I think if anything, the project should be settings macros like
`_POSIX_C_SOURCE`, globally.
    24e5fd3bed
  30. fanquake force-pushed on May 21, 2025
  31. fanquake commented at 3:00 pm on May 21, 2025: member
    Reverted to the prior change, given we cannot assume availablility.
  32. hebasto approved
  33. hebasto commented at 3:57 pm on May 21, 2025: member
    re-ACK 24e5fd3bedcebacbc10f0449be61be636b77dd79, only rebased since my recent review.
  34. DrahtBot requested review from laanwj on May 21, 2025
  35. DrahtBot added the label CI failed on May 21, 2025
  36. laanwj commented at 9:47 pm on May 21, 2025: member

    Then, given that the fallback seems to be needed by OpenBSD and newlibc (possibly others), it may be better to keep it?

    It would be even better to use ftruncate on openbsd. But yes, simply assuming posix_fallocate availability is going to fail on some platforms.

  37. fanquake commented at 8:39 am on May 22, 2025: member

    It would be even better to use ftruncate on openbsd.

    I haven’t got anything OpenBSD handy to test on, but happy for someone to followup with these changes.

  38. DrahtBot removed the label CI failed on May 23, 2025
  39. fanquake commented at 11:56 am on May 23, 2025: member

    Guix Build:

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