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33 * @(#)file.h 8.3 (Berkeley) 1/9/95
34 * $Id: file.h,v 1.1.1.1 2006/05/30 06:12:53 hhzhou Exp $
41 #include <sys/fcntl.h>
42 #include <sys/unistd.h>
46 #include <sys/queue.h>
52 * Kernel descriptor table.
53 * One entry for each open kernel vnode and socket.
56 LIST_ENTRY(file
) f_list
;/* list of active files */
57 short f_flag
; /* see fcntl.h */
58 #define DTYPE_VNODE 1 /* file */
59 #define DTYPE_SOCKET 2 /* communications endpoint */
60 #define DTYPE_PIPE 3 /* pipe */
61 #define DTYPE_FIFO 4 /* fifo (named pipe) */
62 short f_type
; /* descriptor type */
63 short f_count
; /* reference count */
64 short f_msgcount
; /* references from message queue */
65 struct ucred
*f_cred
; /* credentials associated with descriptor */
67 int (*fo_read
) __P((struct file
*fp
, struct uio
*uio
,
68 struct ucred
*cred
, int flags
));
69 int (*fo_write
) __P((struct file
*fp
, struct uio
*uio
,
70 struct ucred
*cred
, int flags
));
72 int (*fo_ioctl
) __P((struct file
*fp
, u_long com
,
73 caddr_t data
, struct proc
*p
));
74 int (*fo_poll
) __P((struct file
*fp
, int events
,
75 struct ucred
*cred
, struct proc
*p
));
76 int (*fo_close
) __P((struct file
*fp
, struct proc
*p
));
79 * count of sequential accesses -- cleared
80 * by most seek operations.
83 * offset of next expected read
86 caddr_t f_data
; /* vnode or socket */
90 MALLOC_DECLARE(M_FILE
);
93 LIST_HEAD(filelist
, file
);
94 extern struct filelist filehead
; /* head of list of open files */
95 extern struct fileops vnops
;
96 extern int maxfiles
; /* kernel limit on number of open files */
97 extern int maxfilesperproc
; /* per process limit on number of open files */
98 extern int nfiles
; /* actual number of open files */
102 #endif /* !SYS_FILE_H */