/usr/include/x86_64-linux-gnu/asm/vsyscall.h is in linux-libc-dev 4.4.0-21.37.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 | #ifndef _ASM_X86_VSYSCALL_H
#define _ASM_X86_VSYSCALL_H
enum vsyscall_num {
__NR_vgettimeofday,
__NR_vtime,
__NR_vgetcpu,
};
#define VSYSCALL_ADDR (-10UL << 20)
#endif /* _ASM_X86_VSYSCALL_H */
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