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param.h
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/* Compatibility header for old-style Unix parameters and limits. Copyright (C) 1995-2018 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 _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 */