✏ EDIT: typesizes.h

/* bits/typesizes.h -- underlying types for *_t.  Linux/x86-64 version.
   Copyright (C) 2012-2018 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 _BITS_TYPES_H
# error "Never include <bits/typesizes.h> directly; use <sys/types.h> instead."
#endif

#ifndef	_BITS_TYPESIZES_H
#define	_BITS_TYPESIZES_H	1

/* See <bits/types.h> for the meaning of these macros.  This file exists so
   that <bits/types.h> need not vary across different GNU platforms.  */

/* X32 kernel interface is 64-bit.  */
#if defined __x86_64__ && defined __ILP32__
# define __SYSCALL_SLONG_TYPE	__SQUAD_TYPE
# define __SYSCALL_ULONG_TYPE	__UQUAD_TYPE
#else
# define __SYSCALL_SLONG_TYPE	__SLONGWORD_TYPE
# define __SYSCALL_ULONG_TYPE	__ULONGWORD_TYPE
#endif

#define __DEV_T_TYPE		__UQUAD_TYPE
#define __UID_T_TYPE		__U32_TYPE
#define __GID_T_TYPE		__U32_TYPE
#define __INO_T_TYPE		__SYSCALL_ULONG_TYPE
#define __INO64_T_TYPE		__UQUAD_TYPE
#define __MODE_T_TYPE		__U32_TYPE
#ifdef __x86_64__
# define __NLINK_T_TYPE		__SYSCALL_ULONG_TYPE
# define __FSWORD_T_TYPE	__SYSCALL_SLONG_TYPE
#else
# define __NLINK_T_TYPE		__UWORD_TYPE
# define __FSWORD_T_TYPE	__SWORD_TYPE
#endif
#define __OFF_T_TYPE		__SYSCALL_SLONG_TYPE
#define __OFF64_T_TYPE		__SQUAD_TYPE
#define __PID_T_TYPE		__S32_TYPE
#define __RLIM_T_TYPE		__SYSCALL_ULONG_TYPE
#define __RLIM64_T_TYPE		__UQUAD_TYPE
#define __BLKCNT_T_TYPE		__SYSCALL_SLONG_TYPE
#define __BLKCNT64_T_TYPE	__SQUAD_TYPE
#define __FSBLKCNT_T_TYPE	__SYSCALL_ULONG_TYPE
#define __FSBLKCNT64_T_TYPE	__UQUAD_TYPE
#define __FSFILCNT_T_TYPE	__SYSCALL_ULONG_TYPE
#define __FSFILCNT64_T_TYPE	__UQUAD_TYPE
#define __ID_T_TYPE		__U32_TYPE
#define __CLOCK_T_TYPE		__SYSCALL_SLONG_TYPE
#define __TIME_T_TYPE		__SYSCALL_SLONG_TYPE
#define __USECONDS_T_TYPE	__U32_TYPE
#define __SUSECONDS_T_TYPE	__SYSCALL_SLONG_TYPE
#define __DADDR_T_TYPE		__S32_TYPE
#define __KEY_T_TYPE		__S32_TYPE
#define __CLOCKID_T_TYPE	__S32_TYPE
#define __TIMER_T_TYPE		void *
#define __BLKSIZE_T_TYPE	__SYSCALL_SLONG_TYPE
#define __FSID_T_TYPE		struct { int __val[2]; }
#define __SSIZE_T_TYPE		__SWORD_TYPE
#define __CPU_MASK_TYPE 	__SYSCALL_ULONG_TYPE

#ifdef __x86_64__
/* Tell the libc code that off_t and off64_t are actually the same type
   for all ABI purposes, even if possibly expressed as different base types
   for C type-checking purposes.  */
# define __OFF_T_MATCHES_OFF64_T	1

/* Same for ino_t and ino64_t.  */
# define __INO_T_MATCHES_INO64_T	1

/* And for __rlim_t and __rlim64_t.  */
# define __RLIM_T_MATCHES_RLIM64_T	1
#else
# define __RLIM_T_MATCHES_RLIM64_T	0
#endif

/* Number of descriptors that can fit in an `fd_set'.  */
#define __FD_SETSIZE		1024

#endif /* bits/typesizes.h */

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