sysdeps/unix/sysv/linux/sys/param.h

   1 /* Copyright (C) 1995-1997,2000,2001,2003,2008 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, write to the Free
  16    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  17    02111-1307 USA.  */
  18
  19 #ifndef _SYS_PARAM_H
  20 #define _SYS_PARAM_H    1
  21
  22 #ifndef ARG_MAX
  23 # define __undef_ARG_MAX
  24 #endif
  25
  26 #include <limits.h>
  27 #include <linux/limits.h>
  28 #include <linux/param.h>
  29
  30 /* The kernel headers defines ARG_MAX.  The value is wrong, though.  */
  31 #ifndef __undef_ARG_MAX
  32 # undef ARG_MAX
  33 # undef __undef_ARG_MAX
  34 #endif
  35
  36 /* BSD names for some <limits.h> values.  */
  37
  38 #define NBBY            CHAR_BIT
  39 #ifndef NGROUPS
  40 # define NGROUPS        NGROUPS_MAX
  41 #endif
  42 #define MAXSYMLINKS     20
  43 #define CANBSIZ         MAX_CANON
  44 #define MAXPATHLEN      PATH_MAX
  45 /* The following are not really correct but it is a value we used for a
  46    long time and which seems to be usable.  People should not use NOFILE
  47    and NCARGS anyway.  */
  48 #define NOFILE          256
  49 #define NCARGS          131072
  50
  51
  52 #include <sys/types.h>
  53
  54 /* Bit map related macros.  */
  55 #define setbit(a,i)     ((a)[(i)/NBBY] |= 1<<((i)%NBBY))
  56 #define clrbit(a,i)     ((a)[(i)/NBBY] &= ~(1<<((i)%NBBY)))
  57 #define isset(a,i)      ((a)[(i)/NBBY] & (1<<((i)%NBBY)))
  58 #define isclr(a,i)      (((a)[(i)/NBBY] & (1<<((i)%NBBY))) == 0)
  59
  60 /* Macros for counting and rounding.  */
  61 #ifndef howmany
  62 # define howmany(x, y)  (((x) + ((y) - 1)) / (y))
  63 #endif
  64 #ifdef __GNUC__
  65 # define roundup(x, y)  (__builtin_constant_p (y) && powerof2 (y)             \
  66                          ? (((x) + (y) - 1) & ~((y) - 1))                     \
  67                          : ((((x) + ((y) - 1)) / (y)) * (y)))
  68 #else
  69 # define roundup(x, y)  ((((x) + ((y) - 1)) / (y)) * (y))
  70 #endif
  71 #define powerof2(x)     ((((x) - 1) & (x)) == 0)
  72
  73 /* Macros for min/max.  */
  74 #define MIN(a,b) (((a)<(b))?(a):(b))
  75 #define MAX(a,b) (((a)>(b))?(a):(b))
  76
  77
  78 /* Unit of `st_blocks'.  */
  79 #define DEV_BSIZE       512
  80
  81
  82 #endif  /* sys/param.h */