/usr/include/x86_64-linux-gnu/bits/siginfo-arch.h is in libc6-dev 2.27-3ubuntu1.
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 13 14 15 16 17 | /* Architecture-specific adjustments to siginfo_t. x86 version. */
#ifndef _BITS_SIGINFO_ARCH_H
#define _BITS_SIGINFO_ARCH_H 1
#if defined __x86_64__ && __WORDSIZE == 32
/* si_utime and si_stime must be 4 byte aligned for x32 to match the
kernel. We align siginfo_t to 8 bytes so that si_utime and
si_stime are actually aligned to 8 bytes since their offsets are
multiple of 8 bytes. Note: with some compilers, the alignment
attribute would be ignored if it were put in __SI_CLOCK_T instead
of encapsulated in a typedef. */
typedef __clock_t __attribute__ ((__aligned__ (4))) __sigchld_clock_t;
# define __SI_ALIGNMENT __attribute__ ((__aligned__ (8)))
# define __SI_CLOCK_T __sigchld_clock_t
#endif
#endif
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