177 lines
4.7 KiB
C
177 lines
4.7 KiB
C
/* @(#)45 1.39 src/bos/kernel/sys/param.h, sysproc, bos411, 9428A410j 10/27/93 08:00:29 */
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#ifndef _H_PARAM
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#define _H_PARAM
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/*
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* COMPONENT_NAME: (SYSPROC) process management
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*
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* FUNCTIONS: none
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*
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* ORIGINS: 26, 9, 27
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*
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* (C) COPYRIGHT International Business Machines Corp. 1988, 1993
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* All Rights Reserved
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* Licensed Materials - Property of IBM
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*
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* US Government Users Restricted Rights - Use, duplication or
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* disclosure restricted by GSA ADP Schedule Contract with IBM Corp.
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*
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*/
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#include <sys/m_param.h>
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#include <sys/limits.h>
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#include <jfs/fsparam.h>
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#define MAXUPRC CHILD_MAX
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#define NOFILE OPEN_MAX
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/*
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* fundamental variables
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* don't change too often
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*/
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#define MAXPID PID_MAX /* max process id */
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#define MAXUID UID_MAX /* max user id */
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#define MAXLINK LINK_MAX /* max links */
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#define MAXBLK 500 /* max blocks possible for phys IO */
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#define CANBSIZ MAX_CANON /* max size of typewriter line */
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#define NCARGS ARG_MAX /* # characters in exec arglist */
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#define NGROUPS NGROUPS_MAX /* max number of concurrent groups for user */
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/*
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* fundamental constants of the implementation--
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* cannot be changed easily
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*/
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#define PAGESIZE 4096 /* page size in bytes */
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#define PGSHIFT 12 /* log2 of PAGESIZE */
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#define NBPW sizeof(int) /* number of bytes in an integer */
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#define NBPB (8) /* number of bits in a byte */
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#define BPBSHIFT (3) /* log2(NBPB) */
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#define UWSHIFT (5) /* log2(number of bits in an integer) */
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/*
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* UBSIZE: Units for communication with user in ulimit, ustat.
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*/
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#define UBSIZE 512 /* bytes in a "user block" (<= BSIZE) */
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#define UBSHIFT 9 /* LOG2(UBSIZE) */
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#define NCPS 1 /* Number of clicks per segment */
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#define NBPC PAGESIZE /* Number of bytes per click */
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#define NCPD 1 /* Number of clicks per disk block */
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#define BPCSHIFT 12 /* LOG2(NBPC) if exact */
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#ifndef NULL
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#define NULL 0 /* p79626 */
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#endif
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#define GOOD 0
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#define BAD (-1)
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/*
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* MAXPATHLEN defines the longest permissable path length
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* after expanding symbolic links. It is used to allocate
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* a temporary buffer in which to do the name expansion.
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* MAXSYMLINKS defines the maximum number of symbolic links
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* that may be expanded in a path name. It should be set high
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* enough to allow all legitimate uses, but halt infinite loops
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* reasonably quickly.
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*/
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#define MAXPATHLEN (PATH_MAX+1)
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#define MAXSYMLINKS 20
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#ifndef MAXBSIZE
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#ifdef BSIZE
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#define MAXBSIZE BSIZE
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#else
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#define MAXBSIZE 4096
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#endif
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#endif
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#define MAXPATH 512 /* maximum pathlength for mount args */
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#define CMASK 0 /* default mask for file creation */
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#define CDLIMIT (1L<<13) /* default max write address */
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#define NODEVICE (dev_t)(-1)
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#define BASEPRI() (PS == 7) /** really ??????? **/
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#define BUSOPEN(ics) (ics & 0x18)
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/* true if user has /dev/bus open */
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#define lobyte(X) (((unsigned char *)&(X))[1])
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#define hibyte(X) (((unsigned char *)&(X))[0])
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#define loword(X) (((ushort *)&(X))[1])
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#define hiword(X) (((ushort *)&(X))[0])
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/*
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* BSD style param constants for use in AIX
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*/
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/*
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* bit map related macros
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*/
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#define setbit(a,i) ((a)[(i)/NBBY] |= 1<<((i)%NBBY))
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#define clrbit(a,i) ((a)[(i)/NBBY] &= ~(1<<((i)%NBBY)))
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#define isset(a,i) ((a)[(i)/NBBY] & (1<<((i)%NBBY)))
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#define isclr(a,i) (((a)[(i)/NBBY] & (1<<((i)%NBBY))) == 0)
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/*
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* Macros for fast min/max.
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*/
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#ifndef MIN
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#define MIN(a,b) (((a)<(b))?(a):(b))
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#endif /* MIN */
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#ifndef MAX
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#define MAX(a,b) (((a)>(b))?(a):(b))
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#endif /* MAX */
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/*
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* Macros for counting and rounding.
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*/
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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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/*
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* Maximum size of hostname recognized and stored in the kernel.
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*/
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#ifndef MAXHOSTNAMELEN
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#define MAXHOSTNAMELEN 256
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#endif /* MAXHOSTNAMELEN */
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/* for AIX sockets */
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/* MBUF CLUSTER defines, totally unlike the vax */
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#define NBPG PAGESIZE
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/* This used to be CLSIZE, changed to avoid name collision, see sys/tty.h */
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#define CLUSTERSIZE 1 /* one cluster per page */
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#define CLBYTES (CLUSTERSIZE*PAGESIZE) /* PAGESIZE from AIX */
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#define CLOFSET (CLUSTERSIZE*PAGESIZE-1)/* for clusters, like PGOFSET */
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#define claligned(x) ((((int)(x))&CLOFSET)==0)
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#define CLOFF CLOFSET
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#define CLSIZELOG2 0 /* CLUSTERSIZE == PAGESIZE */
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#define CLSHIFT (BPCSHIFT+CLSIZELOG2) /* Bytes per Click shift AIX */
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#if CLUSTERSIZE==1
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#define clbase(i) (i)
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#define clrnd(i) (i)
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#else
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/* give the base virtual address (first of CLUSTERSIZE) */
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#define clbase(i) ((i) &~ (CLUSTERSIZE-1))
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/* round a number of clicks up to a whole cluster */
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#define clrnd(i) (((i) + (CLUSTERSIZE-1)) &~ (CLUSTERSIZE-1))
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#endif
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/* BSD param.h also includes signal.h */
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#ifdef _BSD
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#ifndef _KERNEL
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#include <sys/signal.h>
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#endif /* _KERNEL */
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#endif /* _BSD */
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#include "sys/sysmacros.h"
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#endif /* _H_PARAM */
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