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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 1.15 2005/09/02 07:16:58 hsu Exp $
42 #include <sys/fcntl.h>
43 #include <sys/unistd.h>
46 #if defined(_KERNEL) || defined(_KERNEL_STRUCTURES)
48 #include <sys/queue.h>
62 struct lwkt_port *fo_port;
63 int (*fo_clone)(struct file *); /* additional work after dup */
65 int (*fold_read) (struct file *fp, struct uio *uio,
66 struct ucred *cred, int flags,
68 int (*fold_write) (struct file *fp, struct uio *uio,
69 struct ucred *cred, int flags,
71 int (*fold_ioctl) (struct file *fp, u_long com,
72 caddr_t data, struct thread *td);
73 int (*fold_poll) (struct file *fp, int events,
74 struct ucred *cred, struct thread *td);
75 int (*fold_kqfilter) (struct file *fp,
77 int (*fold_stat) (struct file *fp, struct stat *sb,
79 int (*fold_close) (struct file *fp, struct thread *td);
80 int (*fold_shutdown) (struct file *fp, int how, struct thread *td);
83 #define FOF_OFFSET 1 /* fo_read(), fo_write() flags */
86 * Kernel descriptor table.
87 * One entry for each open kernel vnode and socket.
90 LIST_ENTRY(file) f_list;/* list of active files */
91 short f_FILLER3; /* (old f_flag) */
92 #define DTYPE_VNODE 1 /* file */
93 #define DTYPE_SOCKET 2 /* communications endpoint */
94 #define DTYPE_PIPE 3 /* pipe */
95 #define DTYPE_FIFO 4 /* fifo (named pipe) */
96 #define DTYPE_KQUEUE 5 /* event queue */
97 #define DTYPE_CRYPTO 6 /* crypto */
98 short f_type; /* descriptor type */
99 u_int f_flag; /* see fcntl.h */
100 struct ucred *f_cred; /* credentials associated with descriptor */
101 struct fileops *f_ops;
103 * count of sequential accesses -- cleared
104 * by most seek operations.
107 * offset of next expected read or write
110 void *f_data; /* vnode, pipe, socket, or kqueue */
111 int f_count; /* reference count */
112 int f_msgcount; /* reference count from message queue */
113 struct namecache *f_ncp; /* ncp (required for directories) */
116 LIST_HEAD(filelist, file);
122 #ifdef MALLOC_DECLARE
123 MALLOC_DECLARE(M_FILE);
126 extern int fdrop (struct file *fp, struct thread *td);
128 extern int fp_open(const char *path, int flags, int mode, struct file **fpp);
129 extern int fp_vpopen(struct vnode *vp, int flags, struct file **fpp);
130 extern int fp_pread(struct file *fp, void *buf, size_t nbytes, off_t offset, ssize_t *res);
131 extern int fp_pwrite(struct file *fp, void *buf, size_t nbytes, off_t offset, ssize_t *res);
132 extern int fp_read(struct file *fp, void *buf, size_t nbytes, ssize_t *res, int all);
133 extern int fp_write(struct file *fp, void *buf, size_t nbytes, ssize_t *res);
134 extern int fp_stat(struct file *fp, struct stat *ub);
135 extern int fp_mmap(void *addr, size_t size, int prot, int flags, struct file *fp, off_t pos, void **resp);
137 extern int nofo_shutdown(struct file *fp, int how, struct thread *td);
139 extern int fp_close(struct file *fp);
140 extern int fp_shutdown(struct file *fp, int how);
142 extern struct filelist filehead; /* head of list of open files */
143 extern struct fileops vnode_fileops;
144 extern struct fileops specvnode_fileops;
145 extern struct fileops badfileops;
146 extern int maxfiles; /* kernel limit on number of open files */
147 extern int maxfilesrootres; /* descriptors reserved for root use */
148 extern int maxfilesperproc; /* per process limit on number of open files */
149 extern int nfiles; /* actual number of open files */
153 #endif /* !SYS_FILE_H */