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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_CAPABILITY 12 /* capability */
68 #define DTYPE_PROCDESC 13 /* process descriptor */
75 typedef int fo_rdwr_t(struct file *fp, struct uio *uio,
76 struct ucred *active_cred, int flags,
78 #define FOF_OFFSET 1 /* Use the offset in uio argument */
79 typedef int fo_truncate_t(struct file *fp, off_t length,
80 struct ucred *active_cred, struct thread *td);
81 typedef int fo_ioctl_t(struct file *fp, u_long com, void *data,
82 struct ucred *active_cred, struct thread *td);
83 typedef int fo_poll_t(struct file *fp, int events,
84 struct ucred *active_cred, struct thread *td);
85 typedef int fo_kqfilter_t(struct file *fp, struct knote *kn);
86 typedef int fo_stat_t(struct file *fp, struct stat *sb,
87 struct ucred *active_cred, struct thread *td);
88 typedef int fo_close_t(struct file *fp, struct thread *td);
89 typedef int fo_chmod_t(struct file *fp, mode_t mode,
90 struct ucred *active_cred, struct thread *td);
91 typedef int fo_chown_t(struct file *fp, uid_t uid, gid_t gid,
92 struct ucred *active_cred, struct thread *td);
93 typedef int fo_flags_t;
98 fo_truncate_t *fo_truncate;
101 fo_kqfilter_t *fo_kqfilter;
103 fo_close_t *fo_close;
104 fo_chmod_t *fo_chmod;
105 fo_chown_t *fo_chown;
106 fo_flags_t fo_flags; /* DFLAG_* below */
109 #define DFLAG_PASSABLE 0x01 /* may be passed via unix sockets. */
110 #define DFLAG_SEEKABLE 0x02 /* seekable / nonsequential */
113 #if defined(_KERNEL) || defined(_WANT_FILE)
115 * Kernel descriptor table.
116 * One entry for each open kernel vnode and socket.
118 * Below is the list of locks that protects members in struct file.
120 * (f) protected with mtx_lock(mtx_pool_find(fp))
126 void *f_data; /* file descriptor specific data */
127 struct fileops *f_ops; /* File operations */
128 struct ucred *f_cred; /* associated credentials. */
129 struct vnode *f_vnode; /* NULL or applicable vnode */
130 short f_type; /* descriptor type */
131 short f_vnread_flags; /* (f) Sleep lock for f_offset */
132 volatile u_int f_flag; /* see fcntl.h */
133 volatile u_int f_count; /* reference count */
135 * DTYPE_VNODE specific fields.
137 int f_seqcount; /* Count of sequential accesses. */
138 off_t f_nextoff; /* next expected read/write offset. */
139 struct cdev_privdata *f_cdevpriv; /* (d) Private data for the cdev. */
141 * DFLAG_SEEKABLE specific fields
145 * Mandatory Access control information.
147 void *f_label; /* Place-holder for MAC label. */
150 #define FOFFSET_LOCKED 0x1
151 #define FOFFSET_LOCK_WAITING 0x2
153 #endif /* _KERNEL || _WANT_FILE */
156 * Userland version of struct file, for sysctl
159 size_t xf_size; /* size of struct xfile */
160 pid_t xf_pid; /* owning process */
161 uid_t xf_uid; /* effective uid of owning process */
162 int xf_fd; /* descriptor number */
163 void *xf_file; /* address of struct file */
164 short xf_type; /* descriptor type */
165 int xf_count; /* reference count */
166 int xf_msgcount; /* references from message queue */
167 off_t xf_offset; /* file offset */
168 void *xf_data; /* file descriptor specific data */
169 void *xf_vnode; /* vnode pointer */
170 u_int xf_flag; /* flags (see fcntl.h) */
175 #ifdef MALLOC_DECLARE
176 MALLOC_DECLARE(M_FILE);
179 extern struct fileops vnops;
180 extern struct fileops badfileops;
181 extern struct fileops socketops;
182 extern int maxfiles; /* kernel limit on number of open files */
183 extern int maxfilesperproc; /* per process limit on number of open files */
184 extern volatile int openfiles; /* actual number of open files */
186 int fget(struct thread *td, int fd, cap_rights_t rights, struct file **fpp);
187 int fget_mmap(struct thread *td, int fd, cap_rights_t rights,
188 u_char *maxprotp, struct file **fpp);
189 int fget_read(struct thread *td, int fd, cap_rights_t rights,
191 int fget_write(struct thread *td, int fd, cap_rights_t rights,
193 int fgetcap(struct thread *td, int fd, struct file **fpp);
194 int _fdrop(struct file *fp, struct thread *td);
197 * The socket operations are used a couple of places.
198 * XXX: This is wrong, they should go through the operations vector for
199 * XXX: sockets instead of going directly for the individual functions. /phk
203 fo_truncate_t soo_truncate;
204 fo_ioctl_t soo_ioctl;
206 fo_kqfilter_t soo_kqfilter;
208 fo_close_t soo_close;
210 fo_chmod_t invfo_chmod;
211 fo_chown_t invfo_chown;
213 void finit(struct file *, u_int, short, void *, struct fileops *);
214 int fgetvp(struct thread *td, int fd, cap_rights_t rights, struct vnode **vpp);
215 int fgetvp_rights(struct thread *td, int fd, cap_rights_t need,
216 cap_rights_t *have, struct vnode **vpp);
217 int fgetvp_read(struct thread *td, int fd, cap_rights_t rights,
219 int fgetvp_write(struct thread *td, int fd, cap_rights_t rights,
222 int fgetsock(struct thread *td, int fd, cap_rights_t rights,
223 struct socket **spp, u_int *fflagp);
224 void fputsock(struct socket *sp);
234 (refcount_acquire(&(fp)->f_count))
235 #define fdrop(fp, td) \
236 (refcount_release(&(fp)->f_count) ? _fdrop((fp), (td)) : _fnoop())
238 static __inline fo_rdwr_t fo_read;
239 static __inline fo_rdwr_t fo_write;
240 static __inline fo_truncate_t fo_truncate;
241 static __inline fo_ioctl_t fo_ioctl;
242 static __inline fo_poll_t fo_poll;
243 static __inline fo_kqfilter_t fo_kqfilter;
244 static __inline fo_stat_t fo_stat;
245 static __inline fo_close_t fo_close;
246 static __inline fo_chmod_t fo_chmod;
247 static __inline fo_chown_t fo_chown;
250 fo_read(struct file *fp, struct uio *uio, struct ucred *active_cred,
251 int flags, struct thread *td)
254 return ((*fp->f_ops->fo_read)(fp, uio, active_cred, flags, td));
258 fo_write(struct file *fp, struct uio *uio, struct ucred *active_cred,
259 int flags, struct thread *td)
262 return ((*fp->f_ops->fo_write)(fp, uio, active_cred, flags, td));
266 fo_truncate(struct file *fp, off_t length, struct ucred *active_cred,
270 return ((*fp->f_ops->fo_truncate)(fp, length, active_cred, td));
274 fo_ioctl(struct file *fp, u_long com, void *data, struct ucred *active_cred,
278 return ((*fp->f_ops->fo_ioctl)(fp, com, data, active_cred, td));
282 fo_poll(struct file *fp, int events, struct ucred *active_cred,
286 return ((*fp->f_ops->fo_poll)(fp, events, active_cred, td));
290 fo_stat(struct file *fp, struct stat *sb, struct ucred *active_cred,
294 return ((*fp->f_ops->fo_stat)(fp, sb, active_cred, td));
298 fo_close(struct file *fp, struct thread *td)
301 return ((*fp->f_ops->fo_close)(fp, td));
305 fo_kqfilter(struct file *fp, struct knote *kn)
308 return ((*fp->f_ops->fo_kqfilter)(fp, kn));
312 fo_chmod(struct file *fp, mode_t mode, struct ucred *active_cred,
316 return ((*fp->f_ops->fo_chmod)(fp, mode, active_cred, td));
320 fo_chown(struct file *fp, uid_t uid, gid_t gid, struct ucred *active_cred,
324 return ((*fp->f_ops->fo_chown)(fp, uid, gid, active_cred, td));
329 #endif /* !SYS_FILE_H */