usr/src/ucbhead/sys/param.h

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License, Version 1.0 only
   6  * (the "License").  You may not use this file except in compliance
   7  * with the License.
   8  *
   9  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
  10  * or http://www.opensolaris.org/os/licensing.
  11  * See the License for the specific language governing permissions
  12  * and limitations under the License.
  13  *
  14  * When distributing Covered Code, include this CDDL HEADER in each
  15  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  16  * If applicable, add the following below this CDDL HEADER, with the
  17  * fields enclosed by brackets "[]" replaced with your own identifying
  18  * information: Portions Copyright [yyyy] [name of copyright owner]
  19  *
  20  * CDDL HEADER END
  21  */
  22 /*
  23  * Copyright 2004 Sun Microsystems, Inc.  All rights reserved.
  24  * Use is subject to license terms.
  25  */
  26
  27 /*      Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
  28 /*        All Rights Reserved   */
  29
  30 /*
  31  * University Copyright- Copyright (c) 1982, 1986, 1988
  32  * The Regents of the University of California
  33  * All Rights Reserved
  34  *
  35  * University Acknowledgment- Portions of this document are derived from
  36  * software developed by the University of California, Berkeley, and its
  37  * contributors.
  38  */
  39
  40 #ifndef _SYS_PARAM_H
  41 #define _SYS_PARAM_H
  42
  43
  44 /*
  45  * Fundamental variables; don't change too often.
  46  *
  47  * This file is included here for compatibility with
  48  * SunOS, but it does *not* include all the values
  49  * define in the SunOS version of this file.
  50  */
  51
  52 #include <sys/isa_defs.h>
  53 #include <limits.h>
  54 #include <unistd.h>
  55
  56 #ifdef __cplusplus
  57 extern "C" {
  58 #endif
  59
  60 #ifndef MAX_INPUT
  61 #define MAX_INPUT       512     /* Maximum bytes stored in the input queue */
  62 #endif
  63
  64 #ifndef MAX_CANON
  65 #define MAX_CANON       256     /* Maximum bytes for canoical processing */
  66 #endif
  67
  68 #define UID_NOBODY      60001
  69 #define GID_NOBODY      60001
  70
  71 #define UID_NOACCESS    60002   /* user ID no access */
  72
  73 #define MAXPID  ((pid_t)sysconf(_SC_MAXPID))    /* max process id */
  74 #define MAXUID  2147483647      /* max user id */
  75 #define MAXLINK 32767           /* max links */
  76
  77 #define NMOUNT          40      /* est. of # mountable fs for quota calc */
  78
  79 /* The values below are defined in limits.h */
  80 #define NOFILE  OPEN_MAX        /* max open files per process */
  81
  82 #define CANBSIZ 256             /* max size of typewriter line  */
  83 #define HZ      ((int)sysconf(_SC_CLK_TCK))  /* ticks/second of the clock */
  84 #define TICK    (1000000000/((int)sysconf(_SC_CLK_TCK)))
  85
  86 #define NCARGS  0x100000        /* # characters in exec arglist */
  87                                 /*   must be multiple of NBPW.  */
  88 /*
  89  * These define the maximum and minimum allowable values of the
  90  * configurable parameter NGROUPS_MAX.
  91  */
  92 #define NGROUPS_UMAX    32
  93 #define NGROUPS_UMIN    8
  94
  95 #define NGROUPS         NGROUPS_MAX     /* max number groups, from limits.h */
  96 #define NOGROUP         -1      /* marker for empty group set member */
  97
  98 /*
  99  * Priorities.  Should not be altered too much.
 100  */
 101
 102 #define PMASK   0177
 103 #define PCATCH  0400
 104 #define PNOSTOP 01000
 105 #define PSWP    0
 106 #define PINOD   10
 107 #define PSNDD   PINOD
 108 #define PAMAP   PINOD
 109 #define PPMAP   PINOD
 110 #define PRIBIO  20
 111 #define PZERO   25
 112 #define PMEM    0
 113 #define NZERO   20
 114 #define PPIPE   26
 115 #define PVFS    27
 116 #define PWAIT   30
 117 #define PLOCK   35
 118 #define PSLEP   39
 119 #define PUSER   60
 120 #define PIDLE   127
 121
 122 /*
 123  * Fundamental constants of the implementation--cannot be changed easily.
 124  */
 125
 126 #define NBPS    0x20000         /* Number of bytes per segment */
 127 #define NBPW    sizeof (int)    /* number of bytes in an integer */
 128
 129 #define CMASK   0               /* default mask for file creation */
 130 #define CDLIMIT (1L<<11)        /* default max write address */
 131 #define NODEV   (dev_t)(-1)
 132 #define NBPSCTR         512     /* Bytes per disk sector.       */
 133 #define UBSIZE          512     /* unix block size.             */
 134 #define SCTRSHFT        9       /* Shift for BPSECT.            */
 135
 136 #define lobyte(X)       (((unsigned char *)&(X))[1])
 137 #define hibyte(X)       (((unsigned char *)&(X))[0])
 138 #define loword(X)       (((ushort_t *)&(X))[1])
 139 #define hiword(X)       (((ushort_t *)&(X))[0])
 140
 141 /* REMOTE -- whether machine is primary, secondary, or regular */
 142 #define SYSNAME 9               /* # chars in system name */
 143 #define PREMOTE 39
 144
 145 /*
 146  * MAXPATHLEN defines the longest permissible path length,
 147  * including the terminating null, after expanding symbolic links.
 148  * MAXSYMLINKS defines the maximum number of symbolic links
 149  * that may be expanded in a path name. It should be set high
 150  * enough to allow all legitimate uses, but halt infinite loops
 151  * reasonably quickly.
 152  * MAXNAMELEN is the length (including the terminating null) of
 153  * the longest permissible file (component) name.
 154  */
 155 #define MAXPATHLEN      1024
 156 #define MAXSYMLINKS     20
 157 #define MAXNAMELEN      256
 158
 159 #ifndef NADDR
 160 #define NADDR 13
 161 #endif
 162
 163 /*
 164  * The following are defined to be the same as
 165  * defined in /usr/include/limits.h.  They are
 166  * needed for pipe and FIFO compatibility.
 167  */
 168 #ifndef PIPE_BUF        /* max # bytes atomic in write to a pipe */
 169 #define PIPE_BUF        5120
 170 #endif  /* PIPE_BUF */
 171
 172 #ifndef PIPE_MAX        /* max # bytes written to a pipe in a write */
 173 #define PIPE_MAX        5120
 174 #endif  /* PIPE_MAX */
 175
 176 #define PIPEBUF PIPE_BUF        /* pipe buffer size */
 177
 178 #ifndef NBBY
 179 #define NBBY    8                       /* number of bits per byte */
 180 #endif
 181
 182 /* macros replacing interleaving functions */
 183 #define dkblock(bp)     ((bp)->b_blkno)
 184 #define dkunit(bp)      (minor((bp)->b_dev) >> 3)
 185
 186 /*
 187  * File system parameters and macros.
 188  *
 189  * The file system is made out of blocks of at most MAXBSIZE units,
 190  * with smaller units (fragments) only in the last direct block.
 191  * MAXBSIZE primarily determines the size of buffers in the buffer
 192  * pool. It may be made larger without any effect on existing
 193  * file systems; however making it smaller make make some file
 194  * systems unmountable.
 195  *
 196  * Note that the blocked devices are assumed to have DEV_BSIZE
 197  * "sectors" and that fragments must be some multiple of this size.
 198  */
 199 #define MAXBSIZE        8192
 200 #define DEV_BSIZE       512
 201 #define DEV_BSHIFT      9               /* log2(DEV_BSIZE) */
 202 #define MAXFRAG         8
 203
 204 #ifdef  _LP64
 205 #define MAXOFF_T        0x7fffffffffffffffl
 206 #define MAXOFFSET_T     0x7fffffffffffffffll
 207 #else
 208 #define MAXOFF_T        0x7fffffff
 209 #ifndef _LONGLONG_TYPE
 210 #define MAXOFFSET_T     0x7fffffff
 211 #else
 212 #define MAXOFFSET_T     0x7fffffffffffffffLL
 213 #endif
 214 #endif  /* _LP64 */
 215
 216 #define btodb(bytes)                    /* calculates (bytes / DEV_BSIZE) */ \
 217         ((unsigned)(bytes) >> DEV_BSHIFT)
 218 #define dbtob(db)                       /* calculates (db * DEV_BSIZE) */ \
 219         ((unsigned)(db) << DEV_BSHIFT)
 220
 221 /*
 222  * PAGES* describes the logical page size used by the system.
 223  */
 224
 225 #define PAGESIZE        (sysconf(_SC_PAGESIZE)) /* All the above, for logical */
 226 #define PAGEOFFSET      (PAGESIZE - 1)
 227 #define PAGEMASK        (~PAGEOFFSET)
 228
 229 /*
 230  * Some random macros for units conversion.
 231  */
 232
 233 /*
 234  * pages to bytes, and back (with and without rounding)
 235  */
 236 #define ptob(x)         ((x) * PAGESIZE)
 237 #define btop(x)         (((unsigned)(x)) / PAGESIZE)
 238 #define btopr(x)        ((((unsigned)(x) + PAGEOFFSET) / PAGESIZE))
 239
 240 /*
 241  * Signals
 242  */
 243
 244 #include <sys/signal.h>
 245 #include <sys/types.h>
 246
 247 /*
 248  * bit map related macros
 249  */
 250 #define setbit(a, i)    ((a)[(i)/NBBY] |= 1<<((i)%NBBY))
 251 #define clrbit(a, i)    ((a)[(i)/NBBY] &= ~(1<<((i)%NBBY)))
 252 #define isset(a, i)     ((a)[(i)/NBBY] & (1<<((i)%NBBY)))
 253 #define isclr(a, i)     (((a)[(i)/NBBY] & (1<<((i)%NBBY))) == 0)
 254
 255 /*
 256  * Macros for fast min/max.
 257  */
 258 #ifndef MIN
 259 #define MIN(a, b)       (((a) < (b))?(a):(b))
 260 #endif
 261 #ifndef MAX
 262 #define MAX(a, b)       (((a) > (b))?(a):(b))
 263 #endif
 264
 265 #define howmany(x, y)   (((x)+((y)-1))/(y))
 266 #define roundup(x, y)   ((((x)+((y)-1))/(y))*(y))
 267
 268 /*
 269  * Scale factor for scaled integers used to count
 270  * %cpu time and load averages.
 271  */
 272 #define FSHIFT  8               /* bits to right of fixed binary point */
 273 #define FSCALE  (1<<FSHIFT)
 274
 275 /*
 276  * Maximum size of hostname recognized and stored in the kernel.
 277  * Same as in /usr/include/netdb.h
 278  */
 279 #ifndef MAXHOSTNAMELEN
 280 #define MAXHOSTNAMELEN  256
 281 #endif
 282
 283 #ifdef __cplusplus
 284 }
 285 #endif
 286
 287 #endif  /* _SYS_PARAM_H */