BSD 4 development

[unix-history] / usr / src / sys / h / file.h

/*      file.h  4.1     11/9/80 */

/*
* 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
{
       short   f_flag;
       short   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;
};

#ifdef  KERNEL
extern  struct file file[];             /* the file table itself */

struct  file *getf();
struct  file *falloc();
#endif

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