1  /* Compatibility header for old-style Unix parameters and limits.
       2     Copyright (C) 1995-2023 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 */