FreeBSD/Linux Kernel Cross Reference
sys/sys/param.h

     /*      $OpenBSD: param.h,v 1.139 2022/07/20 15:12:39 deraadt Exp $     */
     
     /*-
      * Copyright (c) 1982, 1986, 1989, 1993
      *      The Regents of the University of California.  All rights reserved.
      * (c) UNIX System Laboratories, Inc.
      * All or some portions of this file are derived from material licensed
      * to the University of California by American Telephone and Telegraph
      * Co. or Unix System Laboratories, Inc. and are reproduced herein with
     * the permission of UNIX System Laboratories, Inc.
     *
     * Redistribution and use in source and binary forms, with or without
     * modification, are permitted provided that the following conditions
     * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     * 3. Neither the name of the University nor the names of its contributors
     *    may be used to endorse or promote products derived from this software
     *    without specific prior written permission.
     *
     * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     */
    
    #ifndef _SYS_PARAM_H_
    #define _SYS_PARAM_H_
    
    #define BSD     199306          /* System version (year & month). */
    #define BSD4_3  1
    #define BSD4_4  1
    
    #define OpenBSD 202210          /* OpenBSD version (year & month). */
    #define OpenBSD7_2 1            /* OpenBSD 7.2 */
    
    #include <sys/_null.h>
    
    #ifndef _LOCORE
    #include <sys/types.h>
    #endif
    
    /*
     * Machine-independent constants (some used in following include files).
     * Redefined constants are from POSIX 1003.1 limits file.
     *
     * MAXCOMLEN should be >= sizeof(ac_comm) (see <acct.h>)
     * MAXLOGNAME should be >= UT_NAMESIZE (see <utmp.h>)
     */
    #include <sys/syslimits.h>
    
    #define MAXCOMLEN       _MAXCOMLEN-1    /* max command name remembered, without NUL */
    #define MAXINTERP       128             /* max interpreter file name length */
    #define MAXLOGNAME      LOGIN_NAME_MAX  /* max login name length w/ NUL */
    #define MAXUPRC         CHILD_MAX       /* max simultaneous processes */
    #define NCARGS          ARG_MAX         /* max bytes for an exec function */
    #define NGROUPS         NGROUPS_MAX     /* max number groups */
    #define NOFILE          OPEN_MAX        /* max open files per process (soft) */
    #define NOFILE_MAX      1024            /* max open files per process (hard) */
    #define NOGROUP         65535           /* marker for empty group set member */
    #define MAXHOSTNAMELEN  256             /* max hostname length w/ NUL */
    
    /* More types and definitions used throughout the kernel. */
    #ifdef _KERNEL
    #include <sys/errno.h>
    #include <sys/time.h>
    #include <sys/resource.h>
    #include <sys/ucred.h>
    #include <sys/uio.h>
    #include <sys/srp.h>
    #endif
    
    /* Signals. */
    #include <sys/signal.h>
    
    /* Machine type dependent parameters. */
    #include <sys/limits.h>
    #include <machine/param.h>
    
    #ifdef _KERNEL
    /*
     * Priorities.  Note that with 32 run queues, differences less than 4 are
     * insignificant.
     */
    #define PSWP    0
    #define PVM     4
    #define PINOD   8
    #define PRIBIO  16
    #define PVFS    20
   #endif /* _KERNEL */
   #define PZERO   22              /* No longer magic, shouldn't be here.  XXX */
   #ifdef _KERNEL
   #define PSOCK   24
   #define PWAIT   32
   #define PLOCK   36
   #define PPAUSE  40
   #define PUSER   50
   #define MAXPRI  127             /* Priorities range from 0 through MAXPRI. */
   
   #define PRIMASK         0x0ff
   #define PCATCH          0x100   /* OR'd with pri for tsleep to check signals */
   #define PNORELOCK       0x200   /* OR'd with pri for msleep to not reacquire
                                      the mutex */
   #endif /* _KERNEL */
   
   #define NODEV   (dev_t)(-1)     /* non-existent device */
   
   #define ALIGNBYTES              _ALIGNBYTES
   #define ALIGN(p)                _ALIGN(p)
   #define ALIGNED_POINTER(p,t)    _ALIGNED_POINTER(p,t)
   
   /*
    * File system parameters and macros.
    *
    * The file system is made out of blocks of at most MAXBSIZE units, with
    * smaller units (fragments) only in the last direct block.  MAXBSIZE
    * primarily determines the size of buffers in the buffer pool.  It may be
    * made larger without any effect on existing file systems; however making
    * it smaller makes some file systems unmountable.
    */
   #ifdef _KERNEL
   #define MAXPHYS         (64 * 1024)     /* max raw I/O transfer size */
   #endif /* _KERNEL */
   #define MAXBSIZE        (64 * 1024)
   
   #define _DEV_BSHIFT     9               /* log2(DEV_BSIZE) */
   #define DEV_BSIZE       (1 << _DEV_BSHIFT)
   #ifdef _KERNEL
   #define DEV_BSHIFT      _DEV_BSHIFT
   #define BLKDEV_IOSIZE   PAGE_SIZE
   #endif /* _KERNEL */
   
   /* pages to disk blocks */
   #ifndef ctod
   #define ctod(x)         ((x) << (PAGE_SHIFT - _DEV_BSHIFT))
   #endif
   #ifndef dtoc
   #define dtoc(x)         ((x) >> (PAGE_SHIFT - _DEV_BSHIFT))
   #endif
   
   /* bytes to disk blocks */
   #ifndef btodb
   #define btodb(x)        ((x) >> _DEV_BSHIFT)
   #endif
   #ifndef dbtob
   #define dbtob(x)        ((x) << _DEV_BSHIFT)
   #endif
   
   /*
    * MAXPATHLEN defines the longest permissible path length after expanding
    * symbolic links. It is used to allocate a temporary buffer from the buffer
    * pool in which to do the name expansion, hence should be a power of two,
    * and must be less than or equal to MAXBSIZE.  MAXSYMLINKS defines the
    * maximum number of symbolic links that may be expanded in a path name.
    * It should be set high enough to allow all legitimate uses, but halt
    * infinite loops reasonably quickly.
    */
   #define MAXPATHLEN      PATH_MAX
   #define MAXSYMLINKS     SYMLOOP_MAX
   
   /* Macros to set/clear/test flags. */
   #ifdef _KERNEL
   #define SET(t, f)       ((t) |= (f))
   #define CLR(t, f)       ((t) &= ~(f))
   #define ISSET(t, f)     ((t) & (f))
   #endif /* _KERNEL */
   
   /* Bit map related macros. */
   #define setbit(a,i)     ((a)[(i)>>3] |= 1<<((i)&(NBBY-1)))
   #define clrbit(a,i)     ((a)[(i)>>3] &= ~(1<<((i)&(NBBY-1))))
   #define isset(a,i)      ((a)[(i)>>3] & (1<<((i)&(NBBY-1))))
   #define isclr(a,i)      (((a)[(i)>>3] & (1<<((i)&(NBBY-1)))) == 0)
   
   /* Macros for counting and rounding. */
   #ifndef howmany
   #define howmany(x, y)   (((x)+((y)-1))/(y))
   #endif
   #define roundup(x, y)   ((((x)+((y)-1))/(y))*(y))
   #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))
   
   /* Macros for calculating the offset of a field */
   #if !defined(offsetof) && defined(_KERNEL)
   #if __GNUC_PREREQ__(4, 0)
   #define offsetof(s, e) __builtin_offsetof(s, e)
   #else
   #define offsetof(s, e) ((size_t)&((s *)0)->e)
   #endif
   #endif /* !defined(offsetof) && defined(_KERNEL) */
   
   #define nitems(_a)      (sizeof((_a)) / sizeof((_a)[0]))
   
   /*
    * Scale factor for scaled integers used to count %cpu time and load avgs.
    *
    * The number of CPU `tick's that map to a unique `%age' can be expressed
    * by the formula (1 / (2 ^ (FSHIFT - 11))).  The maximum load average that
    * can be calculated (assuming 32 bits) can be closely approximated using
    * the formula (2 ^ (2 * (16 - FSHIFT))) for (FSHIFT < 15).
    *
    * For the scheduler to maintain a 1:1 mapping of CPU `tick' to `%age',
    * FSHIFT must be at least 11; this gives us a maximum load avg of ~1024.
    */
   #define _FSHIFT 11              /* bits to right of fixed binary point */
   #ifdef _KERNEL
   #define FSHIFT  _FSHIFT 
   #endif
   #define FSCALE  (1<<_FSHIFT)
   
   #endif /* !_SYS_PARAM_H_ */

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