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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 1.6 2003/10/13 18:01:28 dillon Exp $
42 #include <sys/fcntl.h>
43 #include <sys/unistd.h>
46 #if defined(_KERNEL) || defined(_KERNEL_STRUCTURES)
48 #include <sys/queue.h>
60 struct lwkt_port *fo_port;
63 int (*fold_read) (struct file *fp, struct uio *uio,
64 struct ucred *cred, int flags,
66 int (*fold_write) (struct file *fp, struct uio *uio,
67 struct ucred *cred, int flags,
69 int (*fold_ioctl) (struct file *fp, u_long com,
70 caddr_t data, struct thread *td);
71 int (*fold_poll) (struct file *fp, int events,
72 struct ucred *cred, struct thread *td);
73 int (*fold_kqfilter) (struct file *fp,
75 int (*fold_stat) (struct file *fp, struct stat *sb,
77 int (*fold_close) (struct file *fp, struct thread *td);
80 #define FOF_OFFSET 1 /* fo_read(), fo_write() flags */
83 * Kernel descriptor table.
84 * One entry for each open kernel vnode and socket.
87 LIST_ENTRY(file) f_list;/* list of active files */
88 short f_FILLER3; /* (old f_flag) */
89 #define DTYPE_VNODE 1 /* file */
90 #define DTYPE_SOCKET 2 /* communications endpoint */
91 #define DTYPE_PIPE 3 /* pipe */
92 #define DTYPE_FIFO 4 /* fifo (named pipe) */
93 #define DTYPE_KQUEUE 5 /* event queue */
94 #define DTYPE_CRYPTO 6 /* crypto */
95 short f_type; /* descriptor type */
96 u_int f_flag; /* see fcntl.h */
97 struct ucred *f_cred; /* credentials associated with descriptor */
98 struct fileops *f_ops;
100 * count of sequential accesses -- cleared
101 * by most seek operations.
104 * offset of next expected read or write
107 caddr_t f_data; /* vnode or socket */
108 int f_count; /* reference count */
109 int f_msgcount; /* reference count from message queue */
112 LIST_HEAD(filelist, file);
118 #ifdef MALLOC_DECLARE
119 MALLOC_DECLARE(M_FILE);
122 extern int fdrop (struct file *fp, struct thread *td);
124 extern int fp_open(const char *path, int flags, int mode, struct file **fpp);
125 extern int fp_read(struct file *fp, void *buf, size_t nbytes, off_t offset, ssize_t *res);
126 extern int fp_write(struct file *fp, void *buf, size_t nbytes, off_t offset, ssize_t *res);
127 extern int fp_stat(struct file *fp, struct stat *ub);
128 extern int fp_mmap(void *addr, size_t size, int prot, int flags, struct file *fp, off_t pos, void **resp);
130 extern int fp_close(struct file *fp);
132 extern struct filelist filehead; /* head of list of open files */
133 extern struct fileops vnops;
134 extern struct fileops badfileops;
135 extern int maxfiles; /* kernel limit on number of open files */
136 extern int maxfilesperproc; /* per process limit on number of open files */
137 extern int nfiles; /* actual number of open files */
141 #endif /* !SYS_FILE_H */