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Annotation of sys/sys/param.h, Revision 1.1

1.1     ! nbrk        1: /*     $OpenBSD: param.h,v 1.72 2007/07/25 20:07:28 deraadt Exp $      */
        !             2: /*     $NetBSD: param.h,v 1.23 1996/03/17 01:02:29 thorpej Exp $       */
        !             3:
        !             4: /*-
        !             5:  * Copyright (c) 1982, 1986, 1989, 1993
        !             6:  *     The Regents of the University of California.  All rights reserved.
        !             7:  * (c) UNIX System Laboratories, Inc.
        !             8:  * All or some portions of this file are derived from material licensed
        !             9:  * to the University of California by American Telephone and Telegraph
        !            10:  * Co. or Unix System Laboratories, Inc. and are reproduced herein with
        !            11:  * the permission of UNIX System Laboratories, Inc.
        !            12:  *
        !            13:  * Redistribution and use in source and binary forms, with or without
        !            14:  * modification, are permitted provided that the following conditions
        !            15:  * are met:
        !            16:  * 1. Redistributions of source code must retain the above copyright
        !            17:  *    notice, this list of conditions and the following disclaimer.
        !            18:  * 2. Redistributions in binary form must reproduce the above copyright
        !            19:  *    notice, this list of conditions and the following disclaimer in the
        !            20:  *    documentation and/or other materials provided with the distribution.
        !            21:  * 3. Neither the name of the University nor the names of its contributors
        !            22:  *    may be used to endorse or promote products derived from this software
        !            23:  *    without specific prior written permission.
        !            24:  *
        !            25:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
        !            26:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
        !            27:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
        !            28:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
        !            29:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
        !            30:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
        !            31:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
        !            32:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
        !            33:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
        !            34:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
        !            35:  * SUCH DAMAGE.
        !            36:  *
        !            37:  *     @(#)param.h     8.2 (Berkeley) 1/21/94
        !            38:  */
        !            39:
        !            40: #define        BSD     199306          /* System version (year & month). */
        !            41: #define BSD4_3 1
        !            42: #define BSD4_4 1
        !            43:
        !            44: #define OpenBSD        200711          /* OpenBSD version (year & month). */
        !            45: #define OpenBSD4_2 1           /* OpenBSD 4.2 */
        !            46:
        !            47: #ifndef NULL
        !            48: #ifdef         __GNUG__
        !            49: #define        NULL    __null
        !            50: #else
        !            51: #define        NULL    0L
        !            52: #endif
        !            53: #endif
        !            54:
        !            55: #ifndef _LOCORE
        !            56: #include <sys/types.h>
        !            57: #include <sys/simplelock.h>
        !            58: #endif
        !            59:
        !            60: /*
        !            61:  * Machine-independent constants (some used in following include files).
        !            62:  * Redefined constants are from POSIX 1003.1 limits file.
        !            63:  *
        !            64:  * MAXCOMLEN should be >= sizeof(ac_comm) (see <acct.h>)
        !            65:  * MAXLOGNAME should be >= UT_NAMESIZE (see <utmp.h>)
        !            66:  */
        !            67: #include <sys/syslimits.h>
        !            68:
        !            69: #define        MAXCOMLEN       16              /* max command name remembered */
        !            70: #define        MAXINTERP       64              /* max interpreter file name length */
        !            71: #define        MAXLOGNAME      LOGIN_NAME_MAX  /* max login name length w/ NUL */
        !            72: #define        MAXUPRC         CHILD_MAX       /* max simultaneous processes */
        !            73: #define        NCARGS          ARG_MAX         /* max bytes for an exec function */
        !            74: #define        NGROUPS         NGROUPS_MAX     /* max number groups */
        !            75: #define        NOFILE          OPEN_MAX        /* max open files per process (soft) */
        !            76: #define        NOFILE_MAX      1024            /* max open files per process (hard) */
        !            77: #define        NOGROUP         65535           /* marker for empty group set member */
        !            78: #define MAXHOSTNAMELEN 256             /* max hostname size */
        !            79:
        !            80: /* More types and definitions used throughout the kernel. */
        !            81: #ifdef _KERNEL
        !            82: #include <sys/cdefs.h>
        !            83: #include <sys/errno.h>
        !            84: #include <sys/time.h>
        !            85: #include <sys/resource.h>
        !            86: #include <sys/ucred.h>
        !            87: #include <sys/uio.h>
        !            88: #endif
        !            89:
        !            90: /* Signals. */
        !            91: #include <sys/signal.h>
        !            92:
        !            93: /* Machine type dependent parameters. */
        !            94: #include <sys/limits.h>
        !            95: #include <machine/param.h>
        !            96:
        !            97: /*
        !            98:  * Priorities.  Note that with 32 run queues, differences less than 4 are
        !            99:  * insignificant.
        !           100:  */
        !           101: #define        PSWP    0
        !           102: #define        PVM     4
        !           103: #define        PINOD   8
        !           104: #define        PRIBIO  16
        !           105: #define        PVFS    20
        !           106: #define        PZERO   22              /* No longer magic, shouldn't be here.  XXX */
        !           107: #define        PSOCK   24
        !           108: #define        PWAIT   32
        !           109: #define        PLOCK   36
        !           110: #define        PPAUSE  40
        !           111: #define        PUSER   50
        !           112: #define        MAXPRI  127             /* Priorities range from 0 through MAXPRI. */
        !           113:
        !           114: #define        PRIMASK         0x0ff
        !           115: #define        PCATCH          0x100   /* OR'd with pri for tsleep to check signals */
        !           116: #define PNORELOCK      0x200   /* OR'd with pri for ltsleep to not relock
        !           117:                                   the interlock */
        !           118:
        !           119: #define        NBPW    sizeof(int)     /* number of bytes per word (integer) */
        !           120:
        !           121: #define        CMASK   022             /* default file mask: S_IWGRP|S_IWOTH */
        !           122: #define        NODEV   (dev_t)(-1)     /* non-existent device */
        !           123: #define NETDEV (dev_t)(-2)     /* network device (for nfs swap) */
        !           124:
        !           125: #define        CBLOCK  64              /* Clist block size, must be a power of 2. */
        !           126: #define CBQSIZE        (CBLOCK/NBBY)   /* Quote bytes/cblock - can do better. */
        !           127:                                /* Data chars/clist. */
        !           128: #define        CBSIZE  (CBLOCK - sizeof(struct cblock *) - CBQSIZE)
        !           129: #define        CROUND  (CBLOCK - 1)    /* Clist rounding. */
        !           130:
        !           131: /*
        !           132:  * Constants related to network buffer management.
        !           133:  * MCLBYTES must be no larger than NBPG (the software page size), and,
        !           134:  * on machines that exchange pages of input or output buffers with mbuf
        !           135:  * clusters (MAPPED_MBUFS), MCLBYTES must also be an integral multiple
        !           136:  * of the hardware page size.
        !           137:  */
        !           138: #define        MSIZE           256             /* size of an mbuf */
        !           139: #define        MCLSHIFT        11              /* convert bytes to m_buf clusters */
        !           140:                                        /* 2K cluster can hold Ether frame */
        !           141: #define        MCLBYTES        (1 << MCLSHIFT) /* size of a m_buf cluster */
        !           142: #define        MCLOFSET        (MCLBYTES - 1)
        !           143:
        !           144:
        !           145: /*
        !           146:  * File system parameters and macros.
        !           147:  *
        !           148:  * The file system is made out of blocks of at most MAXBSIZE units, with
        !           149:  * smaller units (fragments) only in the last direct block.  MAXBSIZE
        !           150:  * primarily determines the size of buffers in the buffer pool.  It may be
        !           151:  * made larger without any effect on existing file systems; however making
        !           152:  * it smaller makes some file systems unmountable.
        !           153:  */
        !           154: #ifndef MAXBSIZE       /* XXX temp until sun3 DMA chaining */
        !           155: #define        MAXBSIZE        MAXPHYS
        !           156: #endif
        !           157: #define MAXFRAG        8
        !           158:
        !           159: /*
        !           160:  * MAXPATHLEN defines the longest permissible path length after expanding
        !           161:  * symbolic links. It is used to allocate a temporary buffer from the buffer
        !           162:  * pool in which to do the name expansion, hence should be a power of two,
        !           163:  * and must be less than or equal to MAXBSIZE.  MAXSYMLINKS defines the
        !           164:  * maximum number of symbolic links that may be expanded in a path name.
        !           165:  * It should be set high enough to allow all legitimate uses, but halt
        !           166:  * infinite loops reasonably quickly.
        !           167:  */
        !           168: #define        MAXPATHLEN      PATH_MAX
        !           169: #define MAXSYMLINKS    SYMLOOP_MAX
        !           170:
        !           171: /* Macros to set/clear/test flags. */
        !           172: #ifdef _KERNEL
        !           173: #define SET(t, f)      ((t) |= (f))
        !           174: #define CLR(t, f)      ((t) &= ~(f))
        !           175: #define ISSET(t, f)    ((t) & (f))
        !           176: #endif
        !           177:
        !           178: /* Bit map related macros. */
        !           179: #define        setbit(a,i)     ((a)[(i)>>3] |= 1<<((i)&(NBBY-1)))
        !           180: #define        clrbit(a,i)     ((a)[(i)>>3] &= ~(1<<((i)&(NBBY-1))))
        !           181: #define        isset(a,i)      ((a)[(i)>>3] & (1<<((i)&(NBBY-1))))
        !           182: #define        isclr(a,i)      (((a)[(i)>>3] & (1<<((i)&(NBBY-1)))) == 0)
        !           183:
        !           184: /* Macros for counting and rounding. */
        !           185: #ifndef howmany
        !           186: #define        howmany(x, y)   (((x)+((y)-1))/(y))
        !           187: #endif
        !           188: #define        roundup(x, y)   ((((x)+((y)-1))/(y))*(y))
        !           189: #define powerof2(x)    ((((x)-1)&(x))==0)
        !           190:
        !           191: /* Macros for min/max. */
        !           192: #define        MIN(a,b) (((a)<(b))?(a):(b))
        !           193: #define        MAX(a,b) (((a)>(b))?(a):(b))
        !           194:
        !           195: /* Macros for calculating the offset of a field */
        !           196: #if !defined(offsetof) && defined(_KERNEL)
        !           197: #define offsetof(s, e) ((size_t)&((s *)0)->e)
        !           198: #endif
        !           199:
        !           200: /*
        !           201:  * Constants for setting the parameters of the kernel memory allocator.
        !           202:  *
        !           203:  * 2 ** MINBUCKET is the smallest unit of memory that will be
        !           204:  * allocated. It must be at least large enough to hold a pointer.
        !           205:  *
        !           206:  * Units of memory less or equal to MAXALLOCSAVE will permanently
        !           207:  * allocate physical memory; requests for these size pieces of
        !           208:  * memory are quite fast. Allocations greater than MAXALLOCSAVE must
        !           209:  * always allocate and free physical memory; requests for these
        !           210:  * size allocations should be done infrequently as they will be slow.
        !           211:  *
        !           212:  * Constraints: PAGE_SIZE <= MAXALLOCSAVE <= 2 ** (MINBUCKET + 14), and
        !           213:  * MAXALLOCSIZE must be a power of two.
        !           214:  */
        !           215: #define MINBUCKET      4               /* 4 => min allocation of 16 bytes */
        !           216: #define MAXALLOCSAVE   (2 * PAGE_SIZE)
        !           217:
        !           218: /*
        !           219:  * Scale factor for scaled integers used to count %cpu time and load avgs.
        !           220:  *
        !           221:  * The number of CPU `tick's that map to a unique `%age' can be expressed
        !           222:  * by the formula (1 / (2 ^ (FSHIFT - 11))).  The maximum load average that
        !           223:  * can be calculated (assuming 32 bits) can be closely approximated using
        !           224:  * the formula (2 ^ (2 * (16 - FSHIFT))) for (FSHIFT < 15).
        !           225:  *
        !           226:  * For the scheduler to maintain a 1:1 mapping of CPU `tick' to `%age',
        !           227:  * FSHIFT must be at least 11; this gives us a maximum load avg of ~1024.
        !           228:  */
        !           229: #define        FSHIFT  11              /* bits to right of fixed binary point */
        !           230: #define FSCALE (1<<FSHIFT)
        !           231:
        !           232: /*
        !           233:  * The time for a process to be blocked before being very swappable.
        !           234:  * This is a number of seconds which the system takes as being a non-trivial
        !           235:  * amount of real time.  You probably shouldn't change this;
        !           236:  * it is used in subtle ways (fractions and multiples of it are, that is, like
        !           237:  * half of a ``long time'', almost a long time, etc.)
        !           238:  * It is related to human patience and other factors which don't really
        !           239:  * change over time.
        !           240:  */
        !           241: #define        MAXSLP  20
        !           242:
        !           243: /*
        !           244:  * rfork() options.
        !           245:  *
        !           246:  * XXX currently, operations without RFPROC set are not supported.
        !           247:  */
        !           248: #define RFNAMEG                (1<<0)  /* UNIMPL new plan9 `name space' */
        !           249: #define RFENVG         (1<<1)  /* UNIMPL copy plan9 `env space' */
        !           250: #define RFFDG          (1<<2)  /* copy fd table */
        !           251: #define RFNOTEG                (1<<3)  /* UNIMPL create new plan9 `note group' */
        !           252: #define RFPROC         (1<<4)  /* change child (else changes curproc) */
        !           253: #define RFMEM          (1<<5)  /* share `address space' */
        !           254: #define RFNOWAIT       (1<<6)  /* parent need not wait() on child */
        !           255: #define RFCNAMEG       (1<<10) /* UNIMPL zero plan9 `name space' */
        !           256: #define RFCENVG                (1<<11) /* UNIMPL zero plan9 `env space' */
        !           257: #define RFCFDG         (1<<12) /* zero fd table */
        !           258: #define RFTHREAD       (1<<13) /* create a thread, not a process */

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