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    Length: 5153 (0x1421)
    Types: TextFile
    Notes: @(#)param.h 13.4 (RC International) 91/07/10 */
    Names: »param.h«

└─⟦50656ff4a⟧ Bits:30010538 TX 3.1 Coldstart
    └─⟦bbf173f5c⟧ »0004« 
        └─⟦this⟧ »./bsd/usr/include/sys/param.h« 

TextFile

/*	@(#)param.h	13.4 (RC International) 91/07/10	*/

#ifndef _PARAM_H
#define _PARAM_H

/*
 * Machine type dependent parameters.
 */
#include <rc/param.h>

#define	NPTEPG		(NBPG/(sizeof (struct pte)))

/*
 * Machine-independent constants
 */

#define MAXLPID	30000		/* max local process id */
#define	NMOUNT	15		/* number of mountable file systems */
#define	MAXUPRC	50		/* max processes per user */

#define NOFILE	256		/* max # of open files, from limits.h */
#define	NCARGS	10240		/* # chars in exec arglist, from limits.h */
#define	NGROUPS	8		/* max number of groups, from limits.h */
#define	NOGROUP	-1		/* marker for empty group set member */
#ifndef NZERO
#define NZERO	20		/* default process priority */
#endif  /* NZERO */

/*
 * Priorities
 */
#define	PSWP	0
#define	PINOD	10
#define PTXQ	15
#define	PRIBIO	20
#define	PRIUBA	24
#define	PZERO	25
#define	PPIPE	26
#define	PWAIT	30
#define	PLOCK	35
#define	PSLEP	40
#define	PUSER	50

/*
 * SYSV
 */
#define	PMASK	0177
#define PCATCH	0400

/*
 * Signals
 */
#include <signal.h>

#define	ISSIG(p) \
	((p)->p_cursig || ((p)->p_sig && ((p)->p_flag&STRC || \
	 ((p)->p_sig &~ ((p)->p_sigignore | (p)->p_sigmask))) && issig()))

#define	TESTSIG(p) \
	((p)->p_cursig || ((p)->p_sig && ((p)->p_flag&STRC || \
	 ((p)->p_sig &~ ((p)->p_sigignore | (p)->p_sigmask))) && testsig()))

/*
 * Fundamental constants of the implementation.
 */
#define	NBBY	8		/* number of bits in a byte, from limits.h */
#ifdef LANGUAGE_C
#define	NBPW	sizeof(int)	/* number of bytes in an integer */
#else
#define	NBPW	4
#endif

#ifndef NULL
#define	NULL	0
#endif /* NULL */
#define	CMASK	0		/* default mask for file creation */
#define	NODEV	(dev_t)(-1)

/*
 * Clustering of hardware pages on machines with ridiculously small
 * page sizes is done here.  The paging subsystem deals with units of
 * CLSIZE pte's describing NBPG (from vm.h) pages each.
 *
 * NOTE: SSIZE, SINCR and UPAGES must be multiples of CLSIZE
 */
#define	CLBYTES		(CLSIZE*NBPG)
#define	CLOFSET		(CLSIZE*NBPG-1)	/* for clusters, like PGOFSET */
#define	claligned(x)	((((int)(x))&CLOFSET)==0)
#define	CLOFF		CLOFSET
#define	CLSHIFT		(PGSHIFT+CLSIZELOG2)
#define btocl(addr)	(((int)(addr) >> CLSHIFT) * CLSIZE)

#if CLSIZE==1
#define	clbase(i)	(i)
#define	clrnd(i)	(i)
#define	for_CLSIZE(x)	(x)=0;
#else
/* give the base virtual address (first of CLSIZE) */
#define	clbase(i)	((i) &~ (CLSIZE-1))
/* round a number of clicks up to a whole cluster */
#define	clrnd(i)	(((i) + (CLSIZE-1)) &~ (CLSIZE-1))
#define	for_CLSIZE(x)	for ((x) = 0; (x) < CLSIZE; (x)++)
#endif

/* C-list buffers (c-blocks); size must be power of 2 */
#define	CBLOCK	64
#define CBQSIZE	(CBLOCK/NBBY)	/* quote bytes/cblock */
#define	CBSIZE	(CBLOCK - sizeof(struct cblock *) - CBQSIZE) /* chars/cblock */
#define	CROUND	(CBLOCK-1)	/* modulo CBLOCK address mask */

#ifdef	LANGUAGE_C
#include	<sys/types.h>
#endif

/*
 * File system parameters and macros.
 *
 * The file system is made out of blocks of MAXBSIZE units.
 * MAXBSIZE primarily determines the size of buffers in the 
 * buffer pool.
 *
 * Note that the blocked devices are assumed to have DEV_BSIZE
 * "sectors".
 * Block devices are read in BLKDEV_IOSIZE units. This number must
 * be a power of two and in the range of
 *	DEV_BSIZE <= BLKDEV_IOSIZE <= MAXBSIZE
 */

#define	MINBUFS		16		/* minimum # buffers */
#define MAXSWBUFS	256		/* maximum # swap buffer headers */
#define	MAXBPERCENT	10		/* maximum percentage of physical 
					 * memory to allocate to buffers */
#define	MAXBSIZE	1024
#define	DEV_BSIZE	1024
#define	DEV_BSHIFT	10		/* log2(DEV_BSIZE) */
#define	BLKDEV_IOSIZE	1024

#define	btodb(bytes)	 		/* calculates (bytes / DEV_BSIZE) */ \
	((unsigned)(bytes) >> DEV_BSHIFT)
#define	dbtob(db)			/* calculates (db * DEV_BSIZE) */ \
	((unsigned)(db) << DEV_BSHIFT)

#define	blkaligned(x)	((((int)(x))&(DEV_BSIZE-1)) == 0)

/*
 * MAXPATHLEN defines the longest permissable 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	255
#define MAXSYMLINKS 	64

/*
 * bit map related macros
 */

#define	setbit(a,i)	((a)[(i)/NBBY] |= 1<<((i)%NBBY))
#define	clrbit(a,i)	((a)[(i)/NBBY] &= ~(1<<((i)%NBBY)))
#define	isset(a,i)	((a)[(i)/NBBY] & (1<<((i)%NBBY)))
#define	isclr(a,i)	(((a)[(i)/NBBY] & (1<<((i)%NBBY))) == 0)

/*
 * bit manipulating within a word
 */

#define	setbitinw(w, i)    ((w) |= 1<<(i))
#define	clrbitinw(w, i)    ((w) &= ~(1<<(i)))
#define isbitsetinw(w, i)  ((w) & (1<<(i)))
#define isbitclrinw(w, i)  (((w) & (1<<(i))) == 0)

/*
 * Macros for fast min/max.
 */
#define	MIN(a,b) (((a)<(b))?(a):(b))
#define	MAX(a,b) (((a)>(b))?(a):(b))

/*
 * Macros for counting and rounding.
 */
#define	howmany(x, y)	(((x)+((y)-1))/(y))
#define	roundup(x, y)	((((x)+((y)-1))/(y))*(y))

#endif /* _PARAM_H */