usr/sys/param.h

/*
 * variables
 */

#define NBUF    15
#define NINODE  100
#define NFILE   100
#define NMOUNT  5
#define NEXEC   4
#define MAXMEM  (32*32)
#define SSIZE   20
#define SINCR   20
#define NOFILE  15
#define CANBSIZ 256
#define CMAPSIZ 100
#define SMAPSIZ 100
#define NCALL   20
#define NPROC   50
#define NTEXT   20
#define NCLIST  100

/*
 * 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    13
#define         SIGHUP  1
#define         SIGINT  2
#define         SIGQIT  3
#define         SIGINS  4
#define         SIGTRC  5
#define         SIGIOT  6
#define         SIGEMT  7
#define         SIGFPT  8
#define         SIGKIL  9
#define         SIGBUS  10
#define         SIGSEG  11
#define         SIGSYS  12

/*
 * fundamental constants
 * cannot be changed
 */

#define USIZE   16
#define NULL    0
#define NODEV   (-1)
#define ROOTINO 1
#define DIRSIZ  14

struct
{
        char    lobyte;
        char    hibyte;
};