usr/src/bin/csh/dir.h

/* @(#)dir.h    4.2 (Berkeley) %G% */

/*
 * Structure for entries in directory stack.
 */
struct  directory       {
        struct  directory *di_next;     /* next in loop */
        struct  directory *di_prev;     /* prev in loop */
        unsigned short *di_count;       /* refcount of processes */
        char    *di_name;               /* actual name */
};
struct directory *dcwd;         /* the one we are in now */