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84e2963f8e
This will facilitate breaking up Nix into multiple packages for each component with Meson.
34 lines
1.3 KiB
C++
34 lines
1.3 KiB
C++
/*
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* Determine the syscall number for `fchmodat2`.
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*
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* On most platforms this is 452. Exceptions can be found on
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* a glibc git checkout via `rg --pcre2 'define __NR_fchmodat2 (?!452)'`.
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*
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* The problem is that glibc 2.39 and libseccomp 2.5.5 are needed to
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* get the syscall number. However, a Nix built against nixpkgs 23.11
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* (glibc 2.38) should still have the issue fixed without depending
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* on the build environment.
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*
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* To achieve that, the macros below try to determine the platform and
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* set the syscall number which is platform-specific, but
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* in most cases 452.
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*
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* TODO: remove this when 23.11 is EOL and the entire (supported) ecosystem
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* is on glibc 2.39.
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*/
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#if HAVE_SECCOMP
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# if defined(__alpha__)
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# define NIX_SYSCALL_FCHMODAT2 562
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# elif defined(__x86_64__) && SIZE_MAX == 0xFFFFFFFF // x32
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# define NIX_SYSCALL_FCHMODAT2 1073742276
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# elif defined(__mips__) && defined(__mips64) && defined(_ABIN64) // mips64/n64
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# define NIX_SYSCALL_FCHMODAT2 5452
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# elif defined(__mips__) && defined(__mips64) && defined(_ABIN32) // mips64/n32
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# define NIX_SYSCALL_FCHMODAT2 6452
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# elif defined(__mips__) && defined(_ABIO32) // mips32
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# define NIX_SYSCALL_FCHMODAT2 4452
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# else
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# define NIX_SYSCALL_FCHMODAT2 452
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# endif
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#endif // HAVE_SECCOMP
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