.ref-Research-V6/usr/sys/systm.h

/*
 * Random set of variables
 * used by more than one
 * routine.
 */
char    canonb[CANBSIZ];        /* buffer for erase and kill (#@) */
int     coremap[CMAPSIZ];       /* space for core allocation */
int     swapmap[SMAPSIZ];       /* space for swap allocation */
int     *rootdir;               /* pointer to inode of root directory */
int     cputype;                /* type of cpu =40, 45, or 70 */
int     execnt;                 /* number of processes in exec */
int     lbolt;                  /* time of day in 60th not in time */
int     time[2];                /* time in sec from 1970 */
int     tout[2];                /* time of day of next sleep */
/*
 * The callout structure is for
 * a routine arranging
 * to be called by the clock interrupt
 * (clock.c) with a specified argument,
 * in a specified amount of time.
 * Used, for example, to time tab
 * delays on teletypes.
 */
struct  callo
{
        int     c_time;         /* incremental time */
        int     c_arg;          /* argument to routine */
        int     (*c_func)();    /* routine */
} callout[NCALL];
/*
 * Mount structure.
 * One allocated on every mount.
 * Used to find the super block.
 */
struct  mount
{
        int     m_dev;          /* device mounted */
        int     *m_bufp;        /* pointer to superblock */
        int     *m_inodp;       /* pointer to mounted on inode */
} mount[NMOUNT];
int     mpid;                   /* generic for unique process id's */
char    runin;                  /* scheduling flag */
char    runout;                 /* scheduling flag */
char    runrun;                 /* scheduling flag */
char    curpri;                 /* more scheduling */
int     maxmem;                 /* actual max memory per process */
int     *lks;                   /* pointer to clock device */
int     rootdev;                /* dev of root see conf.c */
int     swapdev;                /* dev of swap see conf.c */
int     swplo;                  /* block number of swap space */
int     nswap;                  /* size of swap space */
int     updlock;                /* lock for sync */
int     rablock;                /* block to be read ahead */
char    regloc[];               /* locs. of saved user registers (trap.c) */