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Apparently Ubuntu 20 has upgraded to kernel 5.15, but still builds things with 5.4 headers. Signed-off-by: Zygo Blaxell <bees@furryterror.org>
51 lines
946 B
C
51 lines
946 B
C
#ifndef CRUCIBLE_OPENAT2_H
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#define CRUCIBLE_OPENAT2_H
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#include <cstdlib>
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// Compatibility for building on old libc for new kernel
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#include <linux/version.h>
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#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 6, 0)
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#include <linux/openat2.h>
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#else
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#ifndef RESOLVE_NO_XDEV
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#define RESOLVE_NO_XDEV 1
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// RESOLVE_NO_XDEV was there from the beginning of openat2,
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// so if that's missing, so is open_how
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struct open_how {
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__u64 flags;
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__u64 mode;
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__u64 resolve;
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};
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#endif
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#ifndef RESOLVE_NO_MAGICLINKS
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#define RESOLVE_NO_MAGICLINKS 2
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#endif
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#ifndef RESOLVE_NO_SYMLINKS
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#define RESOLVE_NO_SYMLINKS 4
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#endif
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#ifndef RESOLVE_BENEATH
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#define RESOLVE_BENEATH 8
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#endif
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#ifndef RESOLVE_IN_ROOT
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#define RESOLVE_IN_ROOT 16
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#endif
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#endif // Linux version >= v5.6
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extern "C" {
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/// Weak symbol to support libc with no syscall wrapper
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int openat2(int dirfd, const char *pathname, struct open_how *how, size_t size) throw();
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};
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#endif // CRUCIBLE_OPENAT2_H
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