2 * SPDX-License-Identifier: BSD-3-Clause
4 * Copyright (c) 1982, 1986, 1989, 1993
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8 * modification, are permitted provided that the following conditions
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31 * @(#)file.h 8.3 (Berkeley) 1/9/95
39 #include <sys/types.h> /* XXX */
40 #include <sys/fcntl.h>
41 #include <sys/unistd.h>
43 #include <sys/queue.h>
44 #include <sys/refcount.h>
45 #include <sys/_lock.h>
46 #include <sys/_mutex.h>
58 #define DTYPE_NONE 0 /* not yet initialized */
59 #define DTYPE_VNODE 1 /* file */
60 #define DTYPE_SOCKET 2 /* communications endpoint */
61 #define DTYPE_PIPE 3 /* pipe */
62 #define DTYPE_FIFO 4 /* fifo (named pipe) */
63 #define DTYPE_KQUEUE 5 /* event queue */
64 #define DTYPE_CRYPTO 6 /* crypto */
65 #define DTYPE_MQUEUE 7 /* posix message queue */
66 #define DTYPE_SHM 8 /* swap-backed shared memory */
67 #define DTYPE_SEM 9 /* posix semaphore */
68 #define DTYPE_PTS 10 /* pseudo teletype master device */
69 #define DTYPE_DEV 11 /* Device specific fd type */
70 #define DTYPE_PROCDESC 12 /* process descriptor */
71 #define DTYPE_LINUXEFD 13 /* emulation eventfd type */
72 #define DTYPE_LINUXTFD 14 /* emulation timerfd type */
82 #define FOF_OFFSET 0x01 /* Use the offset in uio argument */
83 #define FOF_NOLOCK 0x02 /* Do not take FOFFSET_LOCK */
84 #define FOF_NEXTOFF 0x04 /* Also update f_nextoff */
85 #define FOF_NOUPDATE 0x10 /* Do not update f_offset */
86 off_t foffset_lock(struct file *fp, int flags);
87 void foffset_lock_uio(struct file *fp, struct uio *uio, int flags);
88 void foffset_unlock(struct file *fp, off_t val, int flags);
89 void foffset_unlock_uio(struct file *fp, struct uio *uio, int flags);
92 foffset_get(struct file *fp)
95 return (foffset_lock(fp, FOF_NOLOCK));
98 typedef int fo_rdwr_t(struct file *fp, struct uio *uio,
99 struct ucred *active_cred, int flags,
101 typedef int fo_truncate_t(struct file *fp, off_t length,
102 struct ucred *active_cred, struct thread *td);
103 typedef int fo_ioctl_t(struct file *fp, u_long com, void *data,
104 struct ucred *active_cred, struct thread *td);
105 typedef int fo_poll_t(struct file *fp, int events,
106 struct ucred *active_cred, struct thread *td);
107 typedef int fo_kqfilter_t(struct file *fp, struct knote *kn);
108 typedef int fo_stat_t(struct file *fp, struct stat *sb,
109 struct ucred *active_cred, struct thread *td);
110 typedef int fo_close_t(struct file *fp, struct thread *td);
111 typedef int fo_chmod_t(struct file *fp, mode_t mode,
112 struct ucred *active_cred, struct thread *td);
113 typedef int fo_chown_t(struct file *fp, uid_t uid, gid_t gid,
114 struct ucred *active_cred, struct thread *td);
115 typedef int fo_sendfile_t(struct file *fp, int sockfd, struct uio *hdr_uio,
116 struct uio *trl_uio, off_t offset, size_t nbytes,
117 off_t *sent, int flags, struct thread *td);
118 typedef int fo_seek_t(struct file *fp, off_t offset, int whence,
120 typedef int fo_fill_kinfo_t(struct file *fp, struct kinfo_file *kif,
121 struct filedesc *fdp);
122 typedef int fo_mmap_t(struct file *fp, vm_map_t map, vm_offset_t *addr,
123 vm_size_t size, vm_prot_t prot, vm_prot_t cap_maxprot,
124 int flags, vm_ooffset_t foff, struct thread *td);
125 typedef int fo_aio_queue_t(struct file *fp, struct kaiocb *job);
126 typedef int fo_flags_t;
131 fo_truncate_t *fo_truncate;
132 fo_ioctl_t *fo_ioctl;
134 fo_kqfilter_t *fo_kqfilter;
136 fo_close_t *fo_close;
137 fo_chmod_t *fo_chmod;
138 fo_chown_t *fo_chown;
139 fo_sendfile_t *fo_sendfile;
141 fo_fill_kinfo_t *fo_fill_kinfo;
143 fo_aio_queue_t *fo_aio_queue;
144 fo_flags_t fo_flags; /* DFLAG_* below */
147 #define DFLAG_PASSABLE 0x01 /* may be passed via unix sockets. */
148 #define DFLAG_SEEKABLE 0x02 /* seekable / nonsequential */
151 #if defined(_KERNEL) || defined(_WANT_FILE)
153 * Kernel descriptor table.
154 * One entry for each open kernel vnode and socket.
156 * Below is the list of locks that protects members in struct file.
158 * (a) f_vnode lock required (shared allows both reads and writes)
159 * (f) protected with mtx_lock(mtx_pool_find(fp))
164 struct fadvise_info {
165 int fa_advice; /* (f) FADV_* type. */
166 off_t fa_start; /* (f) Region start. */
167 off_t fa_end; /* (f) Region end. */
171 void *f_data; /* file descriptor specific data */
172 struct fileops *f_ops; /* File operations */
173 struct ucred *f_cred; /* associated credentials. */
174 struct vnode *f_vnode; /* NULL or applicable vnode */
175 short f_type; /* descriptor type */
176 short f_vnread_flags; /* (f) Sleep lock for f_offset */
177 volatile u_int f_flag; /* see fcntl.h */
178 volatile u_int f_count; /* reference count */
180 * DTYPE_VNODE specific fields.
182 int f_seqcount; /* (a) Count of sequential accesses. */
183 off_t f_nextoff; /* next expected read/write offset. */
185 struct cdev_privdata *fvn_cdevpriv;
186 /* (d) Private data for the cdev. */
187 struct fadvise_info *fvn_advice;
190 * DFLAG_SEEKABLE specific fields
194 * Mandatory Access control information.
196 void *f_label; /* Place-holder for MAC label. */
199 #define f_cdevpriv f_vnun.fvn_cdevpriv
200 #define f_advice f_vnun.fvn_advice
202 #define FOFFSET_LOCKED 0x1
203 #define FOFFSET_LOCK_WAITING 0x2
204 #define FDEVFS_VNODE 0x4
206 #endif /* _KERNEL || _WANT_FILE */
209 * Userland version of struct file, for sysctl
212 ksize_t xf_size; /* size of struct xfile */
213 pid_t xf_pid; /* owning process */
214 uid_t xf_uid; /* effective uid of owning process */
215 int xf_fd; /* descriptor number */
217 kvaddr_t xf_file; /* address of struct file */
218 short xf_type; /* descriptor type */
219 short _xf_short_pad1;
220 int xf_count; /* reference count */
221 int xf_msgcount; /* references from message queue */
223 off_t xf_offset; /* file offset */
224 kvaddr_t xf_data; /* file descriptor specific data */
225 kvaddr_t xf_vnode; /* vnode pointer */
226 u_int xf_flag; /* flags (see fcntl.h) */
228 int64_t _xf_int64_pad[6];
233 extern struct fileops vnops;
234 extern struct fileops badfileops;
235 extern struct fileops socketops;
236 extern int maxfiles; /* kernel limit on number of open files */
237 extern int maxfilesperproc; /* per process limit on number of open files */
238 extern volatile int openfiles; /* actual number of open files */
240 int fget(struct thread *td, int fd, cap_rights_t *rightsp, struct file **fpp);
241 int fget_mmap(struct thread *td, int fd, cap_rights_t *rightsp,
242 u_char *maxprotp, struct file **fpp);
243 int fget_read(struct thread *td, int fd, cap_rights_t *rightsp,
245 int fget_write(struct thread *td, int fd, cap_rights_t *rightsp,
247 int fget_fcntl(struct thread *td, int fd, cap_rights_t *rightsp,
248 int needfcntl, struct file **fpp);
249 int _fdrop(struct file *fp, struct thread *td);
251 fo_rdwr_t invfo_rdwr;
252 fo_truncate_t invfo_truncate;
253 fo_ioctl_t invfo_ioctl;
254 fo_poll_t invfo_poll;
255 fo_kqfilter_t invfo_kqfilter;
256 fo_chmod_t invfo_chmod;
257 fo_chown_t invfo_chown;
258 fo_sendfile_t invfo_sendfile;
260 fo_sendfile_t vn_sendfile;
262 fo_fill_kinfo_t vn_fill_kinfo;
263 int vn_fill_kinfo_vnode(struct vnode *vp, struct kinfo_file *kif);
265 void finit(struct file *, u_int, short, void *, struct fileops *);
266 int fgetvp(struct thread *td, int fd, cap_rights_t *rightsp,
268 int fgetvp_exec(struct thread *td, int fd, cap_rights_t *rightsp,
270 int fgetvp_rights(struct thread *td, int fd, cap_rights_t *needrightsp,
271 struct filecaps *havecaps, struct vnode **vpp);
272 int fgetvp_read(struct thread *td, int fd, cap_rights_t *rightsp,
274 int fgetvp_write(struct thread *td, int fd, cap_rights_t *rightsp,
285 (refcount_acquire(&(fp)->f_count))
286 #define fdrop(fp, td) \
287 (refcount_release(&(fp)->f_count) ? _fdrop((fp), (td)) : _fnoop())
289 static __inline fo_rdwr_t fo_read;
290 static __inline fo_rdwr_t fo_write;
291 static __inline fo_truncate_t fo_truncate;
292 static __inline fo_ioctl_t fo_ioctl;
293 static __inline fo_poll_t fo_poll;
294 static __inline fo_kqfilter_t fo_kqfilter;
295 static __inline fo_stat_t fo_stat;
296 static __inline fo_close_t fo_close;
297 static __inline fo_chmod_t fo_chmod;
298 static __inline fo_chown_t fo_chown;
299 static __inline fo_sendfile_t fo_sendfile;
302 fo_read(struct file *fp, struct uio *uio, struct ucred *active_cred,
303 int flags, struct thread *td)
306 return ((*fp->f_ops->fo_read)(fp, uio, active_cred, flags, td));
310 fo_write(struct file *fp, struct uio *uio, struct ucred *active_cred,
311 int flags, struct thread *td)
314 return ((*fp->f_ops->fo_write)(fp, uio, active_cred, flags, td));
318 fo_truncate(struct file *fp, off_t length, struct ucred *active_cred,
322 return ((*fp->f_ops->fo_truncate)(fp, length, active_cred, td));
326 fo_ioctl(struct file *fp, u_long com, void *data, struct ucred *active_cred,
330 return ((*fp->f_ops->fo_ioctl)(fp, com, data, active_cred, td));
334 fo_poll(struct file *fp, int events, struct ucred *active_cred,
338 return ((*fp->f_ops->fo_poll)(fp, events, active_cred, td));
342 fo_stat(struct file *fp, struct stat *sb, struct ucred *active_cred,
346 return ((*fp->f_ops->fo_stat)(fp, sb, active_cred, td));
350 fo_close(struct file *fp, struct thread *td)
353 return ((*fp->f_ops->fo_close)(fp, td));
357 fo_kqfilter(struct file *fp, struct knote *kn)
360 return ((*fp->f_ops->fo_kqfilter)(fp, kn));
364 fo_chmod(struct file *fp, mode_t mode, struct ucred *active_cred,
368 return ((*fp->f_ops->fo_chmod)(fp, mode, active_cred, td));
372 fo_chown(struct file *fp, uid_t uid, gid_t gid, struct ucred *active_cred,
376 return ((*fp->f_ops->fo_chown)(fp, uid, gid, active_cred, td));
380 fo_sendfile(struct file *fp, int sockfd, struct uio *hdr_uio,
381 struct uio *trl_uio, off_t offset, size_t nbytes, off_t *sent, int flags,
385 return ((*fp->f_ops->fo_sendfile)(fp, sockfd, hdr_uio, trl_uio, offset,
386 nbytes, sent, flags, td));
390 fo_seek(struct file *fp, off_t offset, int whence, struct thread *td)
393 return ((*fp->f_ops->fo_seek)(fp, offset, whence, td));
397 fo_fill_kinfo(struct file *fp, struct kinfo_file *kif, struct filedesc *fdp)
400 return ((*fp->f_ops->fo_fill_kinfo)(fp, kif, fdp));
404 fo_mmap(struct file *fp, vm_map_t map, vm_offset_t *addr, vm_size_t size,
405 vm_prot_t prot, vm_prot_t cap_maxprot, int flags, vm_ooffset_t foff,
409 if (fp->f_ops->fo_mmap == NULL)
411 return ((*fp->f_ops->fo_mmap)(fp, map, addr, size, prot, cap_maxprot,
416 fo_aio_queue(struct file *fp, struct kaiocb *job)
419 return ((*fp->f_ops->fo_aio_queue)(fp, job));
424 #endif /* !SYS_FILE_H */