2 * Copyright (c) 1982, 1986, 1989, 1993
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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 */
66 #define DTYPE_DEV 11 /* Device specific fd type */
67 #define DTYPE_PROCDESC 12 /* process descriptor */
75 #define FOF_OFFSET 0x01 /* Use the offset in uio argument */
76 #define FOF_NOLOCK 0x02 /* Do not take FOFFSET_LOCK */
77 #define FOF_NEXTOFF 0x04 /* Also update f_nextoff */
78 #define FOF_NOUPDATE 0x10 /* Do not update f_offset */
79 off_t foffset_lock(struct file *fp, int flags);
80 void foffset_lock_uio(struct file *fp, struct uio *uio, int flags);
81 void foffset_unlock(struct file *fp, off_t val, int flags);
82 void foffset_unlock_uio(struct file *fp, struct uio *uio, int flags);
85 foffset_get(struct file *fp)
88 return (foffset_lock(fp, FOF_NOLOCK));
91 typedef int fo_rdwr_t(struct file *fp, struct uio *uio,
92 struct ucred *active_cred, int flags,
94 typedef int fo_truncate_t(struct file *fp, off_t length,
95 struct ucred *active_cred, struct thread *td);
96 typedef int fo_ioctl_t(struct file *fp, u_long com, void *data,
97 struct ucred *active_cred, struct thread *td);
98 typedef int fo_poll_t(struct file *fp, int events,
99 struct ucred *active_cred, struct thread *td);
100 typedef int fo_kqfilter_t(struct file *fp, struct knote *kn);
101 typedef int fo_stat_t(struct file *fp, struct stat *sb,
102 struct ucred *active_cred, struct thread *td);
103 typedef int fo_close_t(struct file *fp, struct thread *td);
104 typedef int fo_chmod_t(struct file *fp, mode_t mode,
105 struct ucred *active_cred, struct thread *td);
106 typedef int fo_chown_t(struct file *fp, uid_t uid, gid_t gid,
107 struct ucred *active_cred, struct thread *td);
108 typedef int fo_flags_t;
113 fo_truncate_t *fo_truncate;
114 fo_ioctl_t *fo_ioctl;
116 fo_kqfilter_t *fo_kqfilter;
118 fo_close_t *fo_close;
119 fo_chmod_t *fo_chmod;
120 fo_chown_t *fo_chown;
121 fo_flags_t fo_flags; /* DFLAG_* below */
124 #define DFLAG_PASSABLE 0x01 /* may be passed via unix sockets. */
125 #define DFLAG_SEEKABLE 0x02 /* seekable / nonsequential */
128 #if defined(_KERNEL) || defined(_WANT_FILE)
130 * Kernel descriptor table.
131 * One entry for each open kernel vnode and socket.
133 * Below is the list of locks that protects members in struct file.
135 * (f) protected with mtx_lock(mtx_pool_find(fp))
140 struct fadvise_info {
141 int fa_advice; /* (f) FADV_* type. */
142 off_t fa_start; /* (f) Region start. */
143 off_t fa_end; /* (f) Region end. */
144 off_t fa_prevstart; /* (f) Previous NOREUSE start. */
145 off_t fa_prevend; /* (f) Previous NOREUSE end. */
149 void *f_data; /* file descriptor specific data */
150 struct fileops *f_ops; /* File operations */
151 struct ucred *f_cred; /* associated credentials. */
152 struct vnode *f_vnode; /* NULL or applicable vnode */
153 short f_type; /* descriptor type */
154 short f_vnread_flags; /* (f) Sleep lock for f_offset */
155 volatile u_int f_flag; /* see fcntl.h */
156 volatile u_int f_count; /* reference count */
158 * DTYPE_VNODE specific fields.
160 int f_seqcount; /* Count of sequential accesses. */
161 off_t f_nextoff; /* next expected read/write offset. */
163 struct cdev_privdata *fvn_cdevpriv;
164 /* (d) Private data for the cdev. */
165 struct fadvise_info *fvn_advice;
168 * DFLAG_SEEKABLE specific fields
172 * Mandatory Access control information.
174 void *f_label; /* Place-holder for MAC label. */
177 #define f_cdevpriv f_vnun.fvn_cdevpriv
178 #define f_advice f_vnun.fvn_advice
180 #define FOFFSET_LOCKED 0x1
181 #define FOFFSET_LOCK_WAITING 0x2
182 #define FDEVFS_VNODE 0x4
184 #endif /* _KERNEL || _WANT_FILE */
187 * Userland version of struct file, for sysctl
190 size_t xf_size; /* size of struct xfile */
191 pid_t xf_pid; /* owning process */
192 uid_t xf_uid; /* effective uid of owning process */
193 int xf_fd; /* descriptor number */
194 void *xf_file; /* address of struct file */
195 short xf_type; /* descriptor type */
196 int xf_count; /* reference count */
197 int xf_msgcount; /* references from message queue */
198 off_t xf_offset; /* file offset */
199 void *xf_data; /* file descriptor specific data */
200 void *xf_vnode; /* vnode pointer */
201 u_int xf_flag; /* flags (see fcntl.h) */
206 extern struct fileops vnops;
207 extern struct fileops badfileops;
208 extern struct fileops socketops;
209 extern int maxfiles; /* kernel limit on number of open files */
210 extern int maxfilesperproc; /* per process limit on number of open files */
211 extern volatile int openfiles; /* actual number of open files */
213 int fget(struct thread *td, int fd, cap_rights_t rights, struct file **fpp);
214 int fget_mmap(struct thread *td, int fd, cap_rights_t rights,
215 u_char *maxprotp, struct file **fpp);
216 int fget_read(struct thread *td, int fd, cap_rights_t rights,
218 int fget_write(struct thread *td, int fd, cap_rights_t rights,
220 int _fdrop(struct file *fp, struct thread *td);
223 * The socket operations are used a couple of places.
224 * XXX: This is wrong, they should go through the operations vector for
225 * XXX: sockets instead of going directly for the individual functions. /phk
229 fo_truncate_t soo_truncate;
230 fo_ioctl_t soo_ioctl;
232 fo_kqfilter_t soo_kqfilter;
234 fo_close_t soo_close;
236 fo_chmod_t invfo_chmod;
237 fo_chown_t invfo_chown;
239 void finit(struct file *, u_int, short, void *, struct fileops *);
240 int fgetvp(struct thread *td, int fd, cap_rights_t rights, struct vnode **vpp);
241 int fgetvp_exec(struct thread *td, int fd, cap_rights_t rights,
243 int fgetvp_rights(struct thread *td, int fd, cap_rights_t need,
244 struct filecaps *havecaps, struct vnode **vpp);
245 int fgetvp_read(struct thread *td, int fd, cap_rights_t rights,
247 int fgetvp_write(struct thread *td, int fd, cap_rights_t rights,
250 int fgetsock(struct thread *td, int fd, cap_rights_t rights,
251 struct socket **spp, u_int *fflagp);
252 void fputsock(struct socket *sp);
262 (refcount_acquire(&(fp)->f_count))
263 #define fdrop(fp, td) \
264 (refcount_release(&(fp)->f_count) ? _fdrop((fp), (td)) : _fnoop())
266 static __inline fo_rdwr_t fo_read;
267 static __inline fo_rdwr_t fo_write;
268 static __inline fo_truncate_t fo_truncate;
269 static __inline fo_ioctl_t fo_ioctl;
270 static __inline fo_poll_t fo_poll;
271 static __inline fo_kqfilter_t fo_kqfilter;
272 static __inline fo_stat_t fo_stat;
273 static __inline fo_close_t fo_close;
274 static __inline fo_chmod_t fo_chmod;
275 static __inline fo_chown_t fo_chown;
278 fo_read(struct file *fp, struct uio *uio, struct ucred *active_cred,
279 int flags, struct thread *td)
282 return ((*fp->f_ops->fo_read)(fp, uio, active_cred, flags, td));
286 fo_write(struct file *fp, struct uio *uio, struct ucred *active_cred,
287 int flags, struct thread *td)
290 return ((*fp->f_ops->fo_write)(fp, uio, active_cred, flags, td));
294 fo_truncate(struct file *fp, off_t length, struct ucred *active_cred,
298 return ((*fp->f_ops->fo_truncate)(fp, length, active_cred, td));
302 fo_ioctl(struct file *fp, u_long com, void *data, struct ucred *active_cred,
306 return ((*fp->f_ops->fo_ioctl)(fp, com, data, active_cred, td));
310 fo_poll(struct file *fp, int events, struct ucred *active_cred,
314 return ((*fp->f_ops->fo_poll)(fp, events, active_cred, td));
318 fo_stat(struct file *fp, struct stat *sb, struct ucred *active_cred,
322 return ((*fp->f_ops->fo_stat)(fp, sb, active_cred, td));
326 fo_close(struct file *fp, struct thread *td)
329 return ((*fp->f_ops->fo_close)(fp, td));
333 fo_kqfilter(struct file *fp, struct knote *kn)
336 return ((*fp->f_ops->fo_kqfilter)(fp, kn));
340 fo_chmod(struct file *fp, mode_t mode, struct ucred *active_cred,
344 return ((*fp->f_ops->fo_chmod)(fp, mode, active_cred, td));
348 fo_chown(struct file *fp, uid_t uid, gid_t gid, struct ucred *active_cred,
352 return ((*fp->f_ops->fo_chown)(fp, uid, gid, active_cred, td));
357 #endif /* !SYS_FILE_H */