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Jörg Thalheim 2790f5f9ae libutil/file-descriptor: handle EAGAIN in read/write operations
We now see exception beeing thrown when remote building in master
because of writing to a non-blocking file descriptor from our json logger.

> #0  0x00007f2ea97aea9c in __pthread_kill_implementation () from /nix/store/wn7v2vhyyyi6clcyn0s9ixvl7d4d87ic-glibc-2.40-36/lib/libc.so.6
> #1  0x00007f2ea975c576 in raise () from /nix/store/wn7v2vhyyyi6clcyn0s9ixvl7d4d87ic-glibc-2.40-36/lib/libc.so.6
> #2  0x00007f2ea9744935 in abort () from /nix/store/wn7v2vhyyyi6clcyn0s9ixvl7d4d87ic-glibc-2.40-36/lib/libc.so.6
> #3  0x00007f2ea99e8c2b in __gnu_cxx::__verbose_terminate_handler() [clone .cold] () from /nix/store/ybjcla5bhj8g1y84998pn4a2drfxybkv-gcc-13.3.0-lib/lib/libstdc++.so.6
> #4  0x00007f2ea99f820a in __cxxabiv1::__terminate(void (*)()) () from /nix/store/ybjcla5bhj8g1y84998pn4a2drfxybkv-gcc-13.3.0-lib/lib/libstdc++.so.6
> #5  0x00007f2ea99f8275 in std::terminate() () from /nix/store/ybjcla5bhj8g1y84998pn4a2drfxybkv-gcc-13.3.0-lib/lib/libstdc++.so.6
> #6  0x00007f2ea99f84c7 in __cxa_throw () from /nix/store/ybjcla5bhj8g1y84998pn4a2drfxybkv-gcc-13.3.0-lib/lib/libstdc++.so.6
> #7  0x00007f2eaa5035c2 in nix::writeFull (fd=2, s=..., allowInterrupts=true) at ../unix/file-descriptor.cc:43
> #8  0x00007f2eaa5633c4 in nix::JSONLogger::write (this=this@entry=0x249a7d40, json=...) at /nix/store/4krab2h0hd4wvxxmscxrw21pl77j4i7j-gcc-13.3.0/include/c++/13.3.0/bits/char_traits.h:358
> #9  0x00007f2eaa5658d7 in nix::JSONLogger::logEI (this=<optimized out>, ei=...) at ../logging.cc:242
> #10 0x00007f2ea9c5d048 in nix::Logger::logEI (ei=..., lvl=nix::lvlError, this=0x249a7d40) at /nix/store/a7cq5bqh0ryvnkv4m19ffchnvi8l9qx6-nix-util-2.27.0-dev/include/nix/logging.hh:108
> #11 nix::handleExceptions (programName="nix", fun=...) at ../shared.cc:343
> #12 0x0000000000465b1f in main (argc=<optimized out>, argv=<optimized out>) at /nix/store/4krab2h0hd4wvxxmscxrw21pl77j4i7j-gcc-13.3.0/include/c++/13.3.0/bits/allocator.h:163
> (gdb) frame 10
> #10 0x00007f2ea9c5d048 in nix::Logger::logEI (ei=..., lvl=nix::lvlError, this=0x249a7d40) at /nix/store/a7cq5bqh0ryvnkv4m19ffchnvi8l9qx6-nix-util-2.27.0-dev/include/nix/logging.hh:108
> 108             logEI(ei);

So far only drainFD sets the non-blocking flag on a "readable" file descriptor,
while this is a "writeable" file descriptor.
It's not clear to me yet, why we see logs after that point, but it's
also not that bad to handle EAGAIN in read/write functions after all.
2025-03-19 22:02:18 +01:00
.github build(deps): bump cachix/install-nix-action from 30 to 31 2025-03-10 22:58:40 +00:00
contrib function-trace: always show the trace 2019-09-18 23:23:21 +02:00
doc/manual Improve the documentation of store path 2025-03-19 13:45:10 +08:00
maintainers {libutil,libexpr}: Move pos-idx,pos-table code to libutil 2025-03-13 13:29:08 +00:00
misc Install init system configs only when relevant 2024-12-03 16:51:01 +01:00
nix-meson-build-support Only enable big-obj on Windows 2025-02-01 21:36:50 +11:00
packaging Merge pull request #12578 from roberth/complete-hydra-build-jobs 2025-03-19 10:11:19 +01:00
scripts nix-profile.fish: Look for ca-bundle.crt in $NIX_PROFILES 2025-02-05 01:42:21 -08:00
src libutil/file-descriptor: handle EAGAIN in read/write operations 2025-03-19 22:02:18 +01:00
tests nix-cli: Add --json --pretty / --no-pretty 2025-03-14 12:39:13 +00:00
.clang-format Factor out lookupExecutable and other PATH improvments 2024-08-07 18:12:58 -04:00
.clang-tidy Add .clang-tidy 2024-02-01 01:01:39 +01:00
.dir-locals.el .dir-locals.el: Set c-block-comment-prefix 2020-07-10 11:21:06 +02:00
.editorconfig No global eval settings in libnixexpr 2024-06-24 12:15:16 -04:00
.gitignore Expand manual on derivation outputs 2025-02-27 02:13:36 -05:00
.mergify.yml .mergify.yml: Add backport 2.27-maintenance entry 2025-03-01 22:54:57 +01:00
.shellcheckrc housekeeping: shellcheck for tests/functional/ca/build-cache.sh 2024-06-12 17:41:16 -04:00
.version Bump version 2025-01-22 13:37:05 +01:00
CITATION.cff chore: PhD thesis as reference in CITATION.cff 2024-05-18 20:05:22 +02:00
CONTRIBUTING.md Rename doc/manual{src -> source} 2024-10-14 11:21:24 -04:00
COPYING * Change this to LGPL to keep the government happy. 2006-04-25 16:41:06 +00:00
default.nix Format .nix files 2025-01-24 17:04:02 +01:00
docker.nix Format .nix files 2025-01-24 17:04:02 +01:00
flake.lock Remove nixfmt override 2025-02-19 10:29:58 +01:00
flake.nix flake: Enable UBSAN for checks 2025-03-09 00:24:47 +03:00
HACKING.md Rename doc/manual{src -> source} 2024-10-14 11:21:24 -04:00
meson.build Add nix-flake-c, nix_flake_init_global, nix_flake_settings_new 2024-11-24 23:57:24 +01:00
meson.options Don't build the API docs in the devshell 2024-11-12 20:18:33 +01:00
precompiled-headers.h Build a minimized Nix with MinGW 2024-04-17 12:26:10 -04:00
README.md README: update CI badge 2024-08-22 23:16:14 +08:00
shell.nix Remove url literals 2022-01-24 13:28:21 +01:00

Nix

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Nix is a powerful package manager for Linux and other Unix systems that makes package management reliable and reproducible. Please refer to the Nix manual for more details.

Installation and first steps

Visit nix.dev for installation instructions and beginner tutorials.

Full reference documentation can be found in the Nix manual.

Building and developing

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Contributing

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Additional resources

Nix was created by Eelco Dolstra and developed as the subject of his PhD thesis The Purely Functional Software Deployment Model, published 2006. Today, a world-wide developer community contributes to Nix and the ecosystem that has grown around it.

License

Nix is released under the LGPL v2.1.