2 * Copyright (c) 1982, 1986, 1989, 1993
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6 * modification, are permitted provided that the following conditions
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29 * @(#)file.h 8.3 (Berkeley) 1/9/95
37 #include <sys/types.h> /* XXX */
38 #include <sys/fcntl.h>
39 #include <sys/unistd.h>
41 #include <sys/queue.h>
42 #include <sys/refcount.h>
43 #include <sys/_lock.h>
44 #include <sys/_mutex.h>
56 #define DTYPE_VNODE 1 /* file */
57 #define DTYPE_SOCKET 2 /* communications endpoint */
58 #define DTYPE_PIPE 3 /* pipe */
59 #define DTYPE_FIFO 4 /* fifo (named pipe) */
60 #define DTYPE_KQUEUE 5 /* event queue */
61 #define DTYPE_CRYPTO 6 /* crypto */
62 #define DTYPE_MQUEUE 7 /* posix message queue */
63 #define DTYPE_SHM 8 /* swap-backed shared memory */
64 #define DTYPE_SEM 9 /* posix semaphore */
65 #define DTYPE_PTS 10 /* pseudo teletype master device */
72 typedef int fo_rdwr_t(struct file *fp, struct uio *uio,
73 struct ucred *active_cred, int flags,
75 #define FOF_OFFSET 1 /* Use the offset in uio argument */
76 typedef int fo_truncate_t(struct file *fp, off_t length,
77 struct ucred *active_cred, struct thread *td);
78 typedef int fo_ioctl_t(struct file *fp, u_long com, void *data,
79 struct ucred *active_cred, struct thread *td);
80 typedef int fo_poll_t(struct file *fp, int events,
81 struct ucred *active_cred, struct thread *td);
82 typedef int fo_kqfilter_t(struct file *fp, struct knote *kn);
83 typedef int fo_stat_t(struct file *fp, struct stat *sb,
84 struct ucred *active_cred, struct thread *td);
85 typedef int fo_close_t(struct file *fp, struct thread *td);
86 typedef int fo_flags_t;
91 fo_truncate_t *fo_truncate;
94 fo_kqfilter_t *fo_kqfilter;
97 fo_flags_t fo_flags; /* DFLAG_* below */
100 #define DFLAG_PASSABLE 0x01 /* may be passed via unix sockets. */
101 #define DFLAG_SEEKABLE 0x02 /* seekable / nonsequential */
104 #if defined(_KERNEL) || defined(_WANT_FILE)
106 * Kernel descriptor table.
107 * One entry for each open kernel vnode and socket.
109 * Below is the list of locks that protects members in struct file.
111 * (f) protected with mtx_lock(mtx_pool_find(fp))
117 void *f_data; /* file descriptor specific data */
118 struct fileops *f_ops; /* File operations */
119 struct ucred *f_cred; /* associated credentials. */
120 struct vnode *f_vnode; /* NULL or applicable vnode */
121 short f_type; /* descriptor type */
122 short f_vnread_flags; /* (f) Sleep lock for f_offset */
123 volatile u_int f_flag; /* see fcntl.h */
124 volatile u_int f_count; /* reference count */
126 * DTYPE_VNODE specific fields.
128 int f_seqcount; /* Count of sequential accesses. */
129 off_t f_nextoff; /* next expected read/write offset. */
130 struct cdev_privdata *f_cdevpriv; /* (d) Private data for the cdev. */
132 * DFLAG_SEEKABLE specific fields
136 * Mandatory Access control information.
138 void *f_label; /* Place-holder for MAC label. */
141 #define FOFFSET_LOCKED 0x1
142 #define FOFFSET_LOCK_WAITING 0x2
144 #endif /* _KERNEL || _WANT_FILE */
147 * Userland version of struct file, for sysctl
150 size_t xf_size; /* size of struct xfile */
151 pid_t xf_pid; /* owning process */
152 uid_t xf_uid; /* effective uid of owning process */
153 int xf_fd; /* descriptor number */
154 void *xf_file; /* address of struct file */
155 short xf_type; /* descriptor type */
156 int xf_count; /* reference count */
157 int xf_msgcount; /* references from message queue */
158 off_t xf_offset; /* file offset */
159 void *xf_data; /* file descriptor specific data */
160 void *xf_vnode; /* vnode pointer */
161 u_int xf_flag; /* flags (see fcntl.h) */
166 #ifdef MALLOC_DECLARE
167 MALLOC_DECLARE(M_FILE);
170 extern struct fileops vnops;
171 extern struct fileops badfileops;
172 extern struct fileops socketops;
173 extern int maxfiles; /* kernel limit on number of open files */
174 extern int maxfilesperproc; /* per process limit on number of open files */
175 extern volatile int openfiles; /* actual number of open files */
177 int fget(struct thread *td, int fd, struct file **fpp);
178 int fget_read(struct thread *td, int fd, struct file **fpp);
179 int fget_write(struct thread *td, int fd, struct file **fpp);
180 int _fdrop(struct file *fp, struct thread *td);
183 * The socket operations are used a couple of places.
184 * XXX: This is wrong, they should go through the operations vector for
185 * XXX: sockets instead of going directly for the individual functions. /phk
189 fo_truncate_t soo_truncate;
190 fo_ioctl_t soo_ioctl;
192 fo_kqfilter_t soo_kqfilter;
194 fo_close_t soo_close;
196 void finit(struct file *, u_int, short, void *, struct fileops *);
197 int fgetvp(struct thread *td, int fd, struct vnode **vpp);
198 int fgetvp_read(struct thread *td, int fd, struct vnode **vpp);
199 int fgetvp_write(struct thread *td, int fd, struct vnode **vpp);
201 int fgetsock(struct thread *td, int fd, struct socket **spp, u_int *fflagp);
202 void fputsock(struct socket *sp);
205 (refcount_acquire(&(fp)->f_count))
206 #define fdrop(fp, td) \
207 (refcount_release(&(fp)->f_count) ? _fdrop((fp), (td)) : 0)
209 static __inline fo_rdwr_t fo_read;
210 static __inline fo_rdwr_t fo_write;
211 static __inline fo_truncate_t fo_truncate;
212 static __inline fo_ioctl_t fo_ioctl;
213 static __inline fo_poll_t fo_poll;
214 static __inline fo_kqfilter_t fo_kqfilter;
215 static __inline fo_stat_t fo_stat;
216 static __inline fo_close_t fo_close;
219 fo_read(fp, uio, active_cred, flags, td)
222 struct ucred *active_cred;
227 return ((*fp->f_ops->fo_read)(fp, uio, active_cred, flags, td));
231 fo_write(fp, uio, active_cred, flags, td)
234 struct ucred *active_cred;
239 return ((*fp->f_ops->fo_write)(fp, uio, active_cred, flags, td));
243 fo_truncate(fp, length, active_cred, td)
246 struct ucred *active_cred;
250 return ((*fp->f_ops->fo_truncate)(fp, length, active_cred, td));
254 fo_ioctl(fp, com, data, active_cred, td)
258 struct ucred *active_cred;
262 return ((*fp->f_ops->fo_ioctl)(fp, com, data, active_cred, td));
266 fo_poll(fp, events, active_cred, td)
269 struct ucred *active_cred;
273 return ((*fp->f_ops->fo_poll)(fp, events, active_cred, td));
277 fo_stat(fp, sb, active_cred, td)
280 struct ucred *active_cred;
284 return ((*fp->f_ops->fo_stat)(fp, sb, active_cred, td));
293 return ((*fp->f_ops->fo_close)(fp, td));
302 return ((*fp->f_ops->fo_kqfilter)(fp, kn));
307 #endif /* !SYS_FILE_H */