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/usr/include/x86_64-linux-gnu/asm/siginfo.h is in linux-libc-dev 4.9.144-3.1.

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#ifndef _ASM_X86_SIGINFO_H
#define _ASM_X86_SIGINFO_H

#ifdef __x86_64__
# ifdef __ILP32__ /* x32 */
typedef long long __kernel_si_clock_t __attribute__((aligned(4)));
#  define __ARCH_SI_CLOCK_T		__kernel_si_clock_t
#  define __ARCH_SI_ATTRIBUTES		__attribute__((aligned(8)))
# else /* x86-64 */
#  define __ARCH_SI_PREAMBLE_SIZE	(4 * sizeof(int))
# endif
#endif

#include <asm-generic/siginfo.h>

#endif /* _ASM_X86_SIGINFO_H */