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

/*
 * One file structure is allocated
 * for each open/creat/pipe call.
 * Main use is to hold the read/write
 * pointer associated with each open
 * file.
 */
struct  file
{
        char    f_flag;
        char    f_count;        /* reference count */
        int     f_inode;        /* pointer to inode structure */
        char    *f_offset[2];   /* read/write character pointer */
} file[NFILE];

/* flags */
#define FREAD   01
#define FWRITE  02
#define FPIPE   04