diff options
Diffstat (limited to 'src/libstore/linux/fchmodat2-compat.hh')
| -rw-r--r-- | src/libstore/linux/fchmodat2-compat.hh | 37 |
1 files changed, 37 insertions, 0 deletions
diff --git a/src/libstore/linux/fchmodat2-compat.hh b/src/libstore/linux/fchmodat2-compat.hh new file mode 100644 index 000000000..b05da6786 --- /dev/null +++ b/src/libstore/linux/fchmodat2-compat.hh @@ -0,0 +1,37 @@ +/* + * Determine the syscall number for `fchmodat2`. + * + * On most platforms this is 452. Exceptions can be found on + * a glibc git checkout via `rg --pcre2 'define __NR_fchmodat2 (?!452)'`. + * + * The problem is that glibc 2.39 and libseccomp 2.5.5 are needed to + * get the syscall number. However, a Nix built against nixpkgs 23.11 + * (glibc 2.38) should still have the issue fixed without depending + * on the build environment. + * + * To achieve that, the macros below try to determine the platform and + * set the syscall number which is platform-specific, but + * in most cases 452. + * + * TODO: remove this when 23.11 is EOL and the entire (supported) ecosystem + * is on glibc 2.39. + */ + +#pragma once +///@file + +#if HAVE_SECCOMP +# if defined(__alpha__) +# define NIX_SYSCALL_FCHMODAT2 562 +# elif defined(__x86_64__) && SIZE_MAX == 0xFFFFFFFF // x32 +# define NIX_SYSCALL_FCHMODAT2 1073742276 +# elif defined(__mips__) && defined(__mips64) && defined(_ABIN64) // mips64/n64 +# define NIX_SYSCALL_FCHMODAT2 5452 +# elif defined(__mips__) && defined(__mips64) && defined(_ABIN32) // mips64/n32 +# define NIX_SYSCALL_FCHMODAT2 6452 +# elif defined(__mips__) && defined(_ABIO32) // mips32 +# define NIX_SYSCALL_FCHMODAT2 4452 +# else +# define NIX_SYSCALL_FCHMODAT2 452 +# endif +#endif // HAVE_SECCOMP |