224 lines
7.5 KiB
C
224 lines
7.5 KiB
C
/* $OpenBSD: param.h,v 1.142 2024/02/17 16:13:24 deraadt Exp $ */
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/*-
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* Copyright (c) 1982, 1986, 1989, 1993
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* The Regents of the University of California. All rights reserved.
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* (c) UNIX System Laboratories, Inc.
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* All or some portions of this file are derived from material licensed
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* to the University of California by American Telephone and Telegraph
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* Co. or Unix System Laboratories, Inc. and are reproduced herein with
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* the permission of UNIX System Laboratories, Inc.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef _SYS_PARAM_H_
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#define _SYS_PARAM_H_
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#define BSD 199306 /* System version (year & month). */
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#define BSD4_3 1
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#define BSD4_4 1
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#define SecBSD 202404 /* SecBSD version (year & month). */
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#define SecBSD1_5 1 /* SecBSD 1.5 */
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#include <sys/_null.h>
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#ifndef _LOCORE
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#include <sys/types.h>
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#endif
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/*
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* Machine-independent constants (some used in following include files).
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* Redefined constants are from POSIX 1003.1 limits file.
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*
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* MAXCOMLEN should be >= sizeof(ac_comm) (see <acct.h>)
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* MAXLOGNAME should be >= UT_NAMESIZE (see <utmp.h>)
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*/
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#include <sys/syslimits.h>
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#define MAXCOMLEN _MAXCOMLEN-1 /* max command name remembered, without NUL */
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#define MAXINTERP 128 /* max interpreter file name length */
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#define MAXLOGNAME LOGIN_NAME_MAX /* max login name length w/ NUL */
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#define MAXUPRC CHILD_MAX /* max simultaneous processes */
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#define NCARGS ARG_MAX /* max bytes for an exec function */
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#define NGROUPS NGROUPS_MAX /* max number groups */
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#define NOFILE OPEN_MAX /* max open files per process (soft) */
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#define NOFILE_MAX 1024 /* max open files per process (hard) */
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#define NOGROUP 65535 /* marker for empty group set member */
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#define MAXHOSTNAMELEN 256 /* max hostname length w/ NUL */
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/* More types and definitions used throughout the kernel. */
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#ifdef _KERNEL
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#include <sys/errno.h>
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#include <sys/time.h>
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#include <sys/resource.h>
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#include <sys/ucred.h>
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#include <sys/uio.h>
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#include <sys/srp.h>
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#endif
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/* Signals. */
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#include <sys/signal.h>
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/* Machine type dependent parameters. */
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#include <sys/limits.h>
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#include <machine/param.h>
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#ifdef _KERNEL
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/*
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* Priorities. Note that with 32 run queues, differences less than 4 are
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* insignificant.
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*/
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#define PSWP 0
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#define PVM 4
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#define PINOD 8
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#define PRIBIO 16
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#define PVFS 20
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#endif /* _KERNEL */
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#define PZERO 22 /* No longer magic, shouldn't be here. XXX */
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#ifdef _KERNEL
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#define PSOCK 24
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#define PWAIT 32
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#define PLOCK 36
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#define PPAUSE 40
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#define PUSER 50
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#define MAXPRI 127 /* Priorities range from 0 through MAXPRI. */
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#define PRIMASK 0x0ff
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#define PCATCH 0x100 /* OR'd with pri for tsleep to check signals */
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#define PNORELOCK 0x200 /* OR'd with pri for msleep to not reacquire
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the mutex */
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#endif /* _KERNEL */
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#define NODEV (dev_t)(-1) /* non-existent device */
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#define ALIGNBYTES _ALIGNBYTES
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#define ALIGN(p) _ALIGN(p)
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#define ALIGNED_POINTER(p,t) _ALIGNED_POINTER(p,t)
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/*
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* File system parameters and macros.
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*
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* The file system is made out of blocks of at most MAXBSIZE units, with
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* smaller units (fragments) only in the last direct block. MAXBSIZE
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* primarily determines the size of buffers in the buffer pool. It may be
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* made larger without any effect on existing file systems; however making
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* it smaller makes some file systems unmountable.
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*/
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#ifdef _KERNEL
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#define MAXPHYS (64 * 1024) /* max raw I/O transfer size */
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#endif /* _KERNEL */
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#define MAXBSIZE (64 * 1024)
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#define _DEV_BSHIFT 9 /* log2(DEV_BSIZE) */
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#define DEV_BSIZE (1 << _DEV_BSHIFT)
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#ifdef _KERNEL
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#define DEV_BSHIFT _DEV_BSHIFT
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#define BLKDEV_IOSIZE PAGE_SIZE
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#endif /* _KERNEL */
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/* pages to disk blocks */
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#ifndef ctod
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#define ctod(x) ((x) << (PAGE_SHIFT - _DEV_BSHIFT))
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#endif
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#ifndef dtoc
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#define dtoc(x) ((x) >> (PAGE_SHIFT - _DEV_BSHIFT))
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#endif
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/* bytes to disk blocks */
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#ifndef btodb
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#define btodb(x) ((x) >> _DEV_BSHIFT)
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#endif
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#ifndef dbtob
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#define dbtob(x) ((x) << _DEV_BSHIFT)
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#endif
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/*
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* MAXPATHLEN defines the longest permissible path length after expanding
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* symbolic links. It is used to allocate a temporary buffer from the buffer
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* pool in which to do the name expansion, hence should be a power of two,
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* and must be less than or equal to MAXBSIZE. MAXSYMLINKS defines the
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* maximum number of symbolic links that may be expanded in a path name.
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* It should be set high enough to allow all legitimate uses, but halt
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* infinite loops reasonably quickly.
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*/
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#define MAXPATHLEN PATH_MAX
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#define MAXSYMLINKS SYMLOOP_MAX
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/* Macros to set/clear/test flags. */
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#ifdef _KERNEL
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#define SET(t, f) ((t) |= (f))
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#define CLR(t, f) ((t) &= ~(f))
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#define ISSET(t, f) ((t) & (f))
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#endif /* _KERNEL */
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/* Bit map related macros. */
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#define setbit(a,i) ((a)[(i)>>3] |= 1<<((i)&(NBBY-1)))
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#define clrbit(a,i) ((a)[(i)>>3] &= ~(1<<((i)&(NBBY-1))))
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#define isset(a,i) ((a)[(i)>>3] & (1<<((i)&(NBBY-1))))
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#define isclr(a,i) (((a)[(i)>>3] & (1<<((i)&(NBBY-1)))) == 0)
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/* Macros for counting and rounding. */
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#ifndef howmany
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#define howmany(x, y) (((x)+((y)-1))/(y))
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#endif
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#define roundup(x, y) ((((x)+((y)-1))/(y))*(y))
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#define powerof2(x) ((((x)-1)&(x))==0)
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/* Macros for min/max. */
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#define MIN(a,b) (((a)<(b))?(a):(b))
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#define MAX(a,b) (((a)>(b))?(a):(b))
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/* Macros for calculating the offset of a field */
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#if !defined(offsetof) && defined(_KERNEL)
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#if __GNUC_PREREQ__(4, 0)
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#define offsetof(s, e) __builtin_offsetof(s, e)
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#else
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#define offsetof(s, e) ((size_t)&((s *)0)->e)
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#endif
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#endif /* !defined(offsetof) && defined(_KERNEL) */
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#define nitems(_a) (sizeof((_a)) / sizeof((_a)[0]))
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/*
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* Scale factor for scaled integers used to count %cpu time and load avgs.
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*
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* The number of CPU `tick's that map to a unique `%age' can be expressed
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* by the formula (1 / (2 ^ (FSHIFT - 11))). The maximum load average that
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* can be calculated (assuming 32 bits) can be closely approximated using
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* the formula (2 ^ (2 * (16 - FSHIFT))) for (FSHIFT < 15).
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*
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* For the scheduler to maintain a 1:1 mapping of CPU `tick' to `%age',
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* FSHIFT must be at least 11; this gives us a maximum load avg of ~1024.
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*/
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#define _FSHIFT 11 /* bits to right of fixed binary point */
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#ifdef _KERNEL
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#define FSHIFT _FSHIFT
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#endif
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#define FSCALE (1<<_FSHIFT)
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#endif /* !_SYS_PARAM_H_ */
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