2 * Copyright (c) 1982, 1986, 1989, 1993
3 * The Regents of the University of California. All rights reserved.
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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 */
70 typedef int fo_rdwr_t(struct file *fp, struct uio *uio,
71 struct ucred *active_cred, int flags,
73 #define FOF_OFFSET 1 /* Use the offset in uio argument */
74 typedef int fo_truncate_t(struct file *fp, off_t length,
75 struct ucred *active_cred, struct thread *td);
76 typedef int fo_ioctl_t(struct file *fp, u_long com, void *data,
77 struct ucred *active_cred, struct thread *td);
78 typedef int fo_poll_t(struct file *fp, int events,
79 struct ucred *active_cred, struct thread *td);
80 typedef int fo_kqfilter_t(struct file *fp, struct knote *kn);
81 typedef int fo_stat_t(struct file *fp, struct stat *sb,
82 struct ucred *active_cred, struct thread *td);
83 typedef int fo_close_t(struct file *fp, struct thread *td);
84 typedef int fo_flags_t;
89 fo_truncate_t *fo_truncate;
92 fo_kqfilter_t *fo_kqfilter;
95 fo_flags_t fo_flags; /* DFLAG_* below */
98 #define DFLAG_PASSABLE 0x01 /* may be passed via unix sockets. */
99 #define DFLAG_SEEKABLE 0x02 /* seekable / nonsequential */
102 #if defined(_KERNEL) || defined(_WANT_FILE)
104 * Kernel descriptor table.
105 * One entry for each open kernel vnode and socket.
107 * Below is the list of locks that protects members in struct file.
109 * (f) protected with mtx_lock(mtx_pool_find(fp))
115 void *f_data; /* file descriptor specific data */
116 struct fileops *f_ops; /* File operations */
117 struct ucred *f_cred; /* associated credentials. */
118 struct vnode *f_vnode; /* NULL or applicable vnode */
119 short f_type; /* descriptor type */
120 short f_vnread_flags; /* (f) Sleep lock for f_offset */
121 volatile u_int f_flag; /* see fcntl.h */
122 volatile u_int f_count; /* reference count */
124 * DTYPE_VNODE specific fields.
126 int f_seqcount; /* Count of sequential accesses. */
127 off_t f_nextoff; /* next expected read/write offset. */
128 struct cdev_privdata *f_cdevpriv; /* (d) Private data for the cdev. */
130 * DFLAG_SEEKABLE specific fields
134 * Mandatory Access control information.
136 void *f_label; /* Place-holder for MAC label. */
139 #define FOFFSET_LOCKED 0x1
140 #define FOFFSET_LOCK_WAITING 0x2
142 #endif /* _KERNEL || _WANT_FILE */
145 * Userland version of struct file, for sysctl
148 size_t xf_size; /* size of struct xfile */
149 pid_t xf_pid; /* owning process */
150 uid_t xf_uid; /* effective uid of owning process */
151 int xf_fd; /* descriptor number */
152 void *xf_file; /* address of struct file */
153 short xf_type; /* descriptor type */
154 int xf_count; /* reference count */
155 int xf_msgcount; /* references from message queue */
156 off_t xf_offset; /* file offset */
157 void *xf_data; /* file descriptor specific data */
158 void *xf_vnode; /* vnode pointer */
159 u_int xf_flag; /* flags (see fcntl.h) */
164 #ifdef MALLOC_DECLARE
165 MALLOC_DECLARE(M_FILE);
168 extern struct fileops vnops;
169 extern struct fileops badfileops;
170 extern struct fileops socketops;
171 extern int maxfiles; /* kernel limit on number of open files */
172 extern int maxfilesperproc; /* per process limit on number of open files */
173 extern volatile int openfiles; /* actual number of open files */
175 int fget(struct thread *td, int fd, struct file **fpp);
176 int fget_read(struct thread *td, int fd, struct file **fpp);
177 int fget_write(struct thread *td, int fd, struct file **fpp);
178 int _fdrop(struct file *fp, struct thread *td);
181 * The socket operations are used a couple of places.
182 * XXX: This is wrong, they should go through the operations vector for
183 * XXX: sockets instead of going directly for the individual functions. /phk
187 fo_truncate_t soo_truncate;
188 fo_ioctl_t soo_ioctl;
190 fo_kqfilter_t soo_kqfilter;
192 fo_close_t soo_close;
194 void finit(struct file *, u_int, short, void *, struct fileops *);
195 int fgetvp(struct thread *td, int fd, struct vnode **vpp);
196 int fgetvp_read(struct thread *td, int fd, struct vnode **vpp);
197 int fgetvp_write(struct thread *td, int fd, struct vnode **vpp);
199 int fgetsock(struct thread *td, int fd, struct socket **spp, u_int *fflagp);
200 void fputsock(struct socket *sp);
203 (refcount_acquire(&(fp)->f_count))
204 #define fdrop(fp, td) \
205 (refcount_release(&(fp)->f_count) ? _fdrop((fp), (td)) : 0)
207 static __inline fo_rdwr_t fo_read;
208 static __inline fo_rdwr_t fo_write;
209 static __inline fo_truncate_t fo_truncate;
210 static __inline fo_ioctl_t fo_ioctl;
211 static __inline fo_poll_t fo_poll;
212 static __inline fo_kqfilter_t fo_kqfilter;
213 static __inline fo_stat_t fo_stat;
214 static __inline fo_close_t fo_close;
217 fo_read(fp, uio, active_cred, flags, td)
220 struct ucred *active_cred;
225 return ((*fp->f_ops->fo_read)(fp, uio, active_cred, flags, td));
229 fo_write(fp, uio, active_cred, flags, td)
232 struct ucred *active_cred;
237 return ((*fp->f_ops->fo_write)(fp, uio, active_cred, flags, td));
241 fo_truncate(fp, length, active_cred, td)
244 struct ucred *active_cred;
248 return ((*fp->f_ops->fo_truncate)(fp, length, active_cred, td));
252 fo_ioctl(fp, com, data, active_cred, td)
256 struct ucred *active_cred;
260 return ((*fp->f_ops->fo_ioctl)(fp, com, data, active_cred, td));
264 fo_poll(fp, events, active_cred, td)
267 struct ucred *active_cred;
271 return ((*fp->f_ops->fo_poll)(fp, events, active_cred, td));
275 fo_stat(fp, sb, active_cred, td)
278 struct ucred *active_cred;
282 return ((*fp->f_ops->fo_stat)(fp, sb, active_cred, td));
291 return ((*fp->f_ops->fo_close)(fp, td));
300 return ((*fp->f_ops->fo_kqfilter)(fp, kn));
305 #endif /* !SYS_FILE_H */