Bell 32V development

[unix-history] / usr / src / sys / h / 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 */
       struct inode *f_inode;  /* pointer to inode structure */
       union {
               off_t   f_offset;       /* read/write character pointer */
               struct chan *f_chan;    /* mpx channel pointer */
       } f_un;
};

extern struct file file[];      /* The file table itself */

/* flags */
#define FREAD   01
#define FWRITE  02
#define FPIPE   04
#define FMPX    010
#define FMPY    020
#define FMP     030