Preview: param.h
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/usr/include/sys/param.h
/* Compatibility header for old-style Unix parameters and limits.
Copyright (C) 1995-2021 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
<https://www.gnu.org/licenses/>. */
#ifndef _SYS_PARAM_H
#define _SYS_PARAM_H 1
#define __need_NULL
#include <stddef.h>
#include <sys/types.h>
#include <limits.h>
#include <endian.h> /* Define BYTE_ORDER et al. */
#include <signal.h> /* Define NSIG. */
/* This file defines some things in system-specific ways. */
#include <bits/param.h>
/* BSD names for some <limits.h> values. */
#define NBBY CHAR_BIT
#if !defined NGROUPS && defined NGROUPS_MAX
# define NGROUPS NGROUPS_MAX
#endif
#if !defined MAXSYMLINKS && defined SYMLOOP_MAX
# define MAXSYMLINKS SYMLOOP_MAX
#endif
#if !defined CANBSIZ && defined MAX_CANON
# define CANBSIZ MAX_CANON
#endif
#if !defined MAXPATHLEN && defined PATH_MAX
# define MAXPATHLEN PATH_MAX
#endif
#if !defined NOFILE && defined OPEN_MAX
# define NOFILE OPEN_MAX
#endif
#if !defined MAXHOSTNAMELEN && defined HOST_NAME_MAX
# define MAXHOSTNAMELEN HOST_NAME_MAX
#endif
#ifndef NCARGS
# ifdef ARG_MAX
# define NCARGS ARG_MAX
# else
/* ARG_MAX is unlimited, but we define NCARGS for BSD programs that want to
compare against some fixed limit. */
# define NCARGS INT_MAX
# endif
#endif
/* Magical constants. */
#ifndef NOGROUP
# define NOGROUP 65535 /* Marker for empty group set member. */
#endif
#ifndef NODEV
# define NODEV ((dev_t) -1) /* Non-existent device. */
#endif
/* Unit of `st_blocks'. */
#ifndef DEV_BSIZE
# define DEV_BSIZE 512
#endif
/* Bit map related macros. */
#define setbit(a,i) ((a)[(i)/NBBY] |= 1<<((i)%NBBY))
#define clrbit(a,i) ((a)[(i)/NBBY] &= ~(1<<((i)%NBBY)))
#define isset(a,i) ((a)[(i)/NBBY] & (1<<((i)%NBBY)))
#define isclr(a,i) (((a)[(i)/NBBY] & (1<<((i)%NBBY))) == 0)
/* Macros for counting and rounding. */
#ifndef howmany
# define howmany(x, y) (((x) + ((y) - 1)) / (y))
#endif
#ifdef __GNUC__
# define roundup(x, y) (__builtin_constant_p (y) && powerof2 (y) \
? (((x) + (y) - 1) & ~((y) - 1)) \
: ((((x) + ((y) - 1)) / (y)) * (y)))
#else
# define roundup(x, y) ((((x) + ((y) - 1)) / (y)) * (y))
#endif
#define powerof2(x) ((((x) - 1) & (x)) == 0)
/* Macros for min/max. */
#define MIN(a,b) (((a)<(b))?(a):(b))
#define MAX(a,b) (((a)>(b))?(a):(b))
#endif /* sys/param.h */
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