/usr/aarch64-linux-gnu/include/sys/sysinfo.h is in libc6-dev-arm64-cross 2.24-10cross1.
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 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 | /* Copyright (C) 1996-2016 Free Software Foundation, Inc.
   This file is part of the GNU C Library.
   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.
   The GNU C Library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Lesser General Public License for more details.
   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library; if not, see
   <http://www.gnu.org/licenses/>.  */
#ifndef _SYS_SYSINFO_H
#define _SYS_SYSINFO_H	1
#include <features.h>
/* Get sysinfo structure from kernel header.  */
#include <linux/kernel.h>
__BEGIN_DECLS
/* Returns information on overall system statistics.  */
extern int sysinfo (struct sysinfo *__info) __THROW;
/* Return number of configured processors.  */
extern int get_nprocs_conf (void) __THROW;
/* Return number of available processors.  */
extern int get_nprocs (void) __THROW;
/* Return number of physical pages of memory in the system.  */
extern long int get_phys_pages (void) __THROW;
/* Return number of available physical pages of memory in the system.  */
extern long int get_avphys_pages (void) __THROW;
__END_DECLS
#endif	/* sys/sysinfo.h */
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