1 /* Compatibility header for old-style Unix parameters and limits. 2 Copyright (C) 1995-2022 Free Software Foundation, Inc. 3 This file is part of the GNU C Library. 4 5 The GNU C Library is free software; you can redistribute it and/or 6 modify it under the terms of the GNU Lesser General Public 7 License as published by the Free Software Foundation; either 8 version 2.1 of the License, or (at your option) any later version. 9 10 The GNU C Library is distributed in the hope that it will be useful, 11 but WITHOUT ANY WARRANTY; without even the implied warranty of 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 13 Lesser General Public License for more details. 14 15 You should have received a copy of the GNU Lesser General Public 16 License along with the GNU C Library; if not, see 17 <https://www.gnu.org/licenses/>. */ 18 19 #ifndef _SYS_PARAM_H 20 #define _SYS_PARAM_H 1 21 22 #define __need_NULL 23 #include <stddef.h> 24 25 #include <sys/types.h> 26 #include <limits.h> 27 #include <endian.h> /* Define BYTE_ORDER et al. */ 28 #include <signal.h> /* Define NSIG. */ 29 30 /* This file defines some things in system-specific ways. */ 31 #include <bits/param.h> 32 33 34 /* BSD names for some <limits.h> values. */ 35 36 #define NBBY CHAR_BIT 37 38 #if !defined NGROUPS && defined NGROUPS_MAX 39 # define NGROUPS NGROUPS_MAX 40 #endif 41 #if !defined MAXSYMLINKS && defined SYMLOOP_MAX 42 # define MAXSYMLINKS SYMLOOP_MAX 43 #endif 44 #if !defined CANBSIZ && defined MAX_CANON 45 # define CANBSIZ MAX_CANON 46 #endif 47 #if !defined MAXPATHLEN && defined PATH_MAX 48 # define MAXPATHLEN PATH_MAX 49 #endif 50 #if !defined NOFILE && defined OPEN_MAX 51 # define NOFILE OPEN_MAX 52 #endif 53 #if !defined MAXHOSTNAMELEN && defined HOST_NAME_MAX 54 # define MAXHOSTNAMELEN HOST_NAME_MAX 55 #endif 56 #ifndef NCARGS 57 # ifdef ARG_MAX 58 # define NCARGS ARG_MAX 59 # else 60 /* ARG_MAX is unlimited, but we define NCARGS for BSD programs that want to 61 compare against some fixed limit. */ 62 # define NCARGS INT_MAX 63 # endif 64 #endif 65 66 67 /* Magical constants. */ 68 #ifndef NOGROUP 69 # define NOGROUP 65535 /* Marker for empty group set member. */ 70 #endif 71 #ifndef NODEV 72 # define NODEV ((dev_t) -1) /* Non-existent device. */ 73 #endif 74 75 76 /* Unit of `st_blocks'. */ 77 #ifndef DEV_BSIZE 78 # define DEV_BSIZE 512 79 #endif 80 81 82 /* Bit map related macros. */ 83 #define setbit(a,i) ((a)[(i)/NBBY] |= 1<<((i)%NBBY)) 84 #define clrbit(a,i) ((a)[(i)/NBBY] &= ~(1<<((i)%NBBY))) 85 #define isset(a,i) ((a)[(i)/NBBY] & (1<<((i)%NBBY))) 86 #define isclr(a,i) (((a)[(i)/NBBY] & (1<<((i)%NBBY))) == 0) 87 88 /* Macros for counting and rounding. */ 89 #ifndef howmany 90 # define howmany(x, y) (((x) + ((y) - 1)) / (y)) 91 #endif 92 #ifdef __GNUC__ 93 # define roundup(x, y) (__builtin_constant_p (y) && powerof2 (y) \ 94 ? (((x) + (y) - 1) & ~((y) - 1)) \ 95 : ((((x) + ((y) - 1)) / (y)) * (y))) 96 #else 97 # define roundup(x, y) ((((x) + ((y) - 1)) / (y)) * (y)) 98 #endif 99 #define powerof2(x) ((((x) - 1) & (x)) == 0) 100 101 /* Macros for min/max. */ 102 #define MIN(a,b) (((a)<(b))?(a):(b)) 103 #define MAX(a,b) (((a)>(b))?(a):(b)) 104 105 106 #endif /* sys/param.h */ 107