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107 lines
3.1 KiB
C
107 lines
3.1 KiB
C
/* Compatibility header for old-style Unix parameters and limits.
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Copyright (C) 1995-2017 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#ifndef _SYS_PARAM_H
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#define _SYS_PARAM_H 1
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#define __need_NULL
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#include <stddef.h>
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#include <sys/types.h>
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#include <limits.h>
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#include <endian.h> /* Define BYTE_ORDER et al. */
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#include <signal.h> /* Define NSIG. */
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/* This file defines some things in system-specific ways. */
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#include <bits/param.h>
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/* BSD names for some <limits.h> values. */
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#define NBBY CHAR_BIT
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#if !defined NGROUPS && defined NGROUPS_MAX
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# define NGROUPS NGROUPS_MAX
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#endif
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#if !defined MAXSYMLINKS && defined SYMLOOP_MAX
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# define MAXSYMLINKS SYMLOOP_MAX
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#endif
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#if !defined CANBSIZ && defined MAX_CANON
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# define CANBSIZ MAX_CANON
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#endif
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#if !defined MAXPATHLEN && defined PATH_MAX
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# define MAXPATHLEN PATH_MAX
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#endif
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#if !defined NOFILE && defined OPEN_MAX
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# define NOFILE OPEN_MAX
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#endif
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#if !defined MAXHOSTNAMELEN && defined HOST_NAME_MAX
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# define MAXHOSTNAMELEN HOST_NAME_MAX
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#endif
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#ifndef NCARGS
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# ifdef ARG_MAX
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# define NCARGS ARG_MAX
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# else
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/* ARG_MAX is unlimited, but we define NCARGS for BSD programs that want to
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compare against some fixed limit. */
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# define NCARGS INT_MAX
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# endif
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#endif
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/* Magical constants. */
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#ifndef NOGROUP
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# define NOGROUP 65535 /* Marker for empty group set member. */
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#endif
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#ifndef NODEV
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# define NODEV ((dev_t) -1) /* Non-existent device. */
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#endif
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/* Unit of `st_blocks'. */
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#ifndef DEV_BSIZE
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# define DEV_BSIZE 512
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#endif
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/* Bit map related macros. */
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#define setbit(a,i) ((a)[(i)/NBBY] |= 1<<((i)%NBBY))
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#define clrbit(a,i) ((a)[(i)/NBBY] &= ~(1<<((i)%NBBY)))
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#define isset(a,i) ((a)[(i)/NBBY] & (1<<((i)%NBBY)))
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#define isclr(a,i) (((a)[(i)/NBBY] & (1<<((i)%NBBY))) == 0)
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/* Macros for counting and rounding. */
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#ifndef howmany
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# define howmany(x, y) (((x) + ((y) - 1)) / (y))
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#endif
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#ifdef __GNUC__
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# define roundup(x, y) (__builtin_constant_p (y) && powerof2 (y) \
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? (((x) + (y) - 1) & ~((y) - 1)) \
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: ((((x) + ((y) - 1)) / (y)) * (y)))
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#else
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# define roundup(x, y) ((((x) + ((y) - 1)) / (y)) * (y))
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#endif
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#define powerof2(x) ((((x) - 1) & (x)) == 0)
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/* Macros for min/max. */
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#define MIN(a,b) (((a)<(b))?(a):(b))
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#define MAX(a,b) (((a)>(b))?(a):(b))
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#endif /* sys/param.h */
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