USG_PG3/usr/source/head/param.h

/*
 * tunable variables
 */

#define	NBUF	15		/* size of buffer cache */
#define	NINODE	100*1		/* number of in core inodes */
#define	NFILE	100*1		/* number of in core file structures */
#define	NMOUNT	5		/* number of mountable file systems */
#define	MAXMEM	(64*32)		/* max core per process - first # is Kw */
#define MAXUMEM	(28672)		/* maximum amt. of user memory in mem blocks */
#define	SSIZE	20		/* initial stack size (*64 bytes) */
#define	SINCR	20		/* increment of stack (*64 bytes) */
#define	NOFILE	20		/* max open files per process */
#define	FCLFILE	15		/* First file auto-closed on exec */
#define	CANBSIZ	256		/* max size of typewriter line */
#define	CMAPSIZ	50		/* size of core allocation area */
#define	SMAPSIZ	50		/* size of swap allocation area */
#define	NCALL	20		/* max simultaneous time callouts */
#define	NPROC	50*1		/* max number of processes */
#define	NTEXT	20		/* max number of pure texts */
#define	NCLIST	100*1		/* max total clist size */
#define	HZ	60		/* Ticks/second of the clock */
#define	MSGBUFS	128		/* Characters saved from error messages */
#define	NCARGS	5120		/* # characters in exec arglist */

#define NLOCK	10		/* max number semaphores */
#define NOLOCK	4		/* max semaphores per process */

#define NMQHDR	10		/* number message q headers */
#define MSGMEM	50		/* memory for messages (*32 bytes) */
#define MMAPSIZ	52		/* size of msg allocation area */

/*
 * priorities
 * probably should not be
 * altered too much
 */

#define	PSWP	-100
#define	PINOD	-90
#define	PRIBIO	-50
#define	PPIPE	1
#define	PWAIT	40
#define	PSLEP	90
#define	PUSER	100

/*
 * signals
 * dont change
 */

#define	NSIG	20
/*
 * No more than 32 signals (1-33) because they are
 * stored in bits in a (long) word.
 */
#define	SIGHUP	1	/* hangup */
#define	SIGINT	2	/* interrupt (rubout) */
#define	SIGQIT	3	/* quit (FS) */
#define	SIGINS	4	/* illegal instruction */
#define	SIGTRC	5	/* trace or breakpoint */
#define	SIGIOT	6	/* iot */
#define	SIGEMT	7	/* emt */
#define	SIGFPT	8	/* floating exception */
#define	SIGKIL	9	/* kill, uncatchable termination */
#define	SIGBUS	10	/* bus error */
#define	SIGSEG	11	/* segmentation violation */
#define	SIGSYS	12	/* bad system call */
#define	SIGPIPE	13	/* end of pipe */
#define	SIGCLK	14	/* alarm clock */
#define	SIGTRM	15	/* Catchable termination */
#define SIGCLD	18	/* Death of a child */

/*
 * fundamental constants
 * cannot be changed
 */

#define	USIZE	16		/* size of user block (*64) */
#define	NULL	0
#define	NODEV	(-1)
#define	ROOTINO	1		/* i number of all roots */
#define	DIRSIZ	14		/* max characters per directory */

/*
 * structure to access an
 * integer in bytes
 */
struct
{
	char	lobyte;
	char	hibyte;
};

/*
 * structure to access an integer
 */
struct
{
	int	integ;
};

/*
 * structure to access a long as integers
 */
struct {
	int	hiword;
	int	loword;
};

/*
 * Certain processor registers
 */
#define PS	0177776
#define KL	0177560
#define SW	0177570

/*
 * Some macros for units conversion
 */
/* Core clicks (64 bytes) to segments */
#define	ctos(x)	((x+127)>>7)

/* Core clicks (64 bytes) to blocks */
#define	ctob(x)	((x+7)>>3)