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15 * This product includes software developed by the University of
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33 * @(#)file.h 8.3 (Berkeley) 1/9/95
34 * $FreeBSD: src/sys/sys/file.h,v 1.22.2.7 2002/11/21 23:39:24 sam Exp $
35 * $DragonFly: src/sys/sys/file.h,v 1.3 2003/06/25 03:56:10 dillon Exp $
42 #include <sys/fcntl.h>
43 #include <sys/unistd.h>
47 #include <sys/queue.h>
56 * Kernel descriptor table.
57 * One entry for each open kernel vnode and socket.
60 LIST_ENTRY(file) f_list;/* list of active files */
61 short f_FILLER3; /* (old f_flag) */
62 #define DTYPE_VNODE 1 /* file */
63 #define DTYPE_SOCKET 2 /* communications endpoint */
64 #define DTYPE_PIPE 3 /* pipe */
65 #define DTYPE_FIFO 4 /* fifo (named pipe) */
66 #define DTYPE_KQUEUE 5 /* event queue */
67 #define DTYPE_CRYPTO 6 /* crypto */
68 short f_type; /* descriptor type */
69 u_int f_flag; /* see fcntl.h */
70 struct ucred *f_cred; /* credentials associated with descriptor */
72 int (*fo_read) __P((struct file *fp, struct uio *uio,
73 struct ucred *cred, int flags,
75 int (*fo_write) __P((struct file *fp, struct uio *uio,
76 struct ucred *cred, int flags,
79 int (*fo_ioctl) __P((struct file *fp, u_long com,
80 caddr_t data, struct thread *td));
81 int (*fo_poll) __P((struct file *fp, int events,
82 struct ucred *cred, struct thread *td));
83 int (*fo_kqfilter) __P((struct file *fp,
85 int (*fo_stat) __P((struct file *fp, struct stat *sb,
87 int (*fo_close) __P((struct file *fp, struct thread *td));
90 * count of sequential accesses -- cleared
91 * by most seek operations.
94 * offset of next expected read or write
97 caddr_t f_data; /* vnode or socket */
98 int f_count; /* reference count */
99 int f_msgcount; /* reference count from message queue */
102 #ifdef MALLOC_DECLARE
103 MALLOC_DECLARE(M_FILE);
106 extern int fdrop __P((struct file *fp, struct thread *td));
108 LIST_HEAD(filelist, file);
109 extern struct filelist filehead; /* head of list of open files */
110 extern struct fileops vnops;
111 extern struct fileops badfileops;
112 extern int maxfiles; /* kernel limit on number of open files */
113 extern int maxfilesperproc; /* per process limit on number of open files */
114 extern int nfiles; /* actual number of open files */
118 #endif /* !SYS_FILE_H */