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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 */
74 typedef int fo_rdwr_t(struct file *fp, struct uio *uio,
75 struct ucred *active_cred, int flags,
77 #define FOF_OFFSET 1 /* Use the offset in uio argument */
78 typedef int fo_truncate_t(struct file *fp, off_t length,
79 struct ucred *active_cred, struct thread *td);
80 typedef int fo_ioctl_t(struct file *fp, u_long com, void *data,
81 struct ucred *active_cred, struct thread *td);
82 typedef int fo_poll_t(struct file *fp, int events,
83 struct ucred *active_cred, struct thread *td);
84 typedef int fo_kqfilter_t(struct file *fp, struct knote *kn);
85 typedef int fo_stat_t(struct file *fp, struct stat *sb,
86 struct ucred *active_cred, struct thread *td);
87 typedef int fo_close_t(struct file *fp, struct thread *td);
88 typedef int fo_flags_t;
93 fo_truncate_t *fo_truncate;
96 fo_kqfilter_t *fo_kqfilter;
99 fo_flags_t fo_flags; /* DFLAG_* below */
102 #define DFLAG_PASSABLE 0x01 /* may be passed via unix sockets. */
103 #define DFLAG_SEEKABLE 0x02 /* seekable / nonsequential */
106 #if defined(_KERNEL) || defined(_WANT_FILE)
108 * Kernel descriptor table.
109 * One entry for each open kernel vnode and socket.
111 * Below is the list of locks that protects members in struct file.
113 * (f) protected with mtx_lock(mtx_pool_find(fp))
119 void *f_data; /* file descriptor specific data */
120 struct fileops *f_ops; /* File operations */
121 struct ucred *f_cred; /* associated credentials. */
122 struct vnode *f_vnode; /* NULL or applicable vnode */
123 short f_type; /* descriptor type */
124 short f_vnread_flags; /* (f) Sleep lock for f_offset */
125 volatile u_int f_flag; /* see fcntl.h */
126 volatile u_int f_count; /* reference count */
128 * DTYPE_VNODE specific fields.
130 int f_seqcount; /* Count of sequential accesses. */
131 off_t f_nextoff; /* next expected read/write offset. */
132 struct cdev_privdata *f_cdevpriv; /* (d) Private data for the cdev. */
134 * DFLAG_SEEKABLE specific fields
138 * Mandatory Access control information.
140 void *f_label; /* Place-holder for MAC label. */
143 #define FOFFSET_LOCKED 0x1
144 #define FOFFSET_LOCK_WAITING 0x2
146 #endif /* _KERNEL || _WANT_FILE */
149 * Userland version of struct file, for sysctl
152 size_t xf_size; /* size of struct xfile */
153 pid_t xf_pid; /* owning process */
154 uid_t xf_uid; /* effective uid of owning process */
155 int xf_fd; /* descriptor number */
156 void *xf_file; /* address of struct file */
157 short xf_type; /* descriptor type */
158 int xf_count; /* reference count */
159 int xf_msgcount; /* references from message queue */
160 off_t xf_offset; /* file offset */
161 void *xf_data; /* file descriptor specific data */
162 void *xf_vnode; /* vnode pointer */
163 u_int xf_flag; /* flags (see fcntl.h) */
168 #ifdef MALLOC_DECLARE
169 MALLOC_DECLARE(M_FILE);
172 extern struct fileops vnops;
173 extern struct fileops badfileops;
174 extern struct fileops socketops;
175 extern int maxfiles; /* kernel limit on number of open files */
176 extern int maxfilesperproc; /* per process limit on number of open files */
177 extern volatile int openfiles; /* actual number of open files */
179 int fget(struct thread *td, int fd, struct file **fpp);
180 int fget_read(struct thread *td, int fd, struct file **fpp);
181 int fget_write(struct thread *td, int fd, struct file **fpp);
182 int fgetcap(struct thread *td, int fd, struct file **fpp);
183 int _fdrop(struct file *fp, struct thread *td);
186 * The socket operations are used a couple of places.
187 * XXX: This is wrong, they should go through the operations vector for
188 * XXX: sockets instead of going directly for the individual functions. /phk
192 fo_truncate_t soo_truncate;
193 fo_ioctl_t soo_ioctl;
195 fo_kqfilter_t soo_kqfilter;
197 fo_close_t soo_close;
199 void finit(struct file *, u_int, short, void *, struct fileops *);
200 int fgetvp(struct thread *td, int fd, struct vnode **vpp);
201 int fgetvp_read(struct thread *td, int fd, struct vnode **vpp);
202 int fgetvp_write(struct thread *td, int fd, struct vnode **vpp);
204 int fgetsock(struct thread *td, int fd, struct socket **spp, u_int *fflagp);
205 void fputsock(struct socket *sp);
215 (refcount_acquire(&(fp)->f_count))
216 #define fdrop(fp, td) \
217 (refcount_release(&(fp)->f_count) ? _fdrop((fp), (td)) : _fnoop())
219 static __inline fo_rdwr_t fo_read;
220 static __inline fo_rdwr_t fo_write;
221 static __inline fo_truncate_t fo_truncate;
222 static __inline fo_ioctl_t fo_ioctl;
223 static __inline fo_poll_t fo_poll;
224 static __inline fo_kqfilter_t fo_kqfilter;
225 static __inline fo_stat_t fo_stat;
226 static __inline fo_close_t fo_close;
229 fo_read(struct file *fp, struct uio *uio, struct ucred *active_cred,
230 int flags, struct thread *td)
233 return ((*fp->f_ops->fo_read)(fp, uio, active_cred, flags, td));
237 fo_write(struct file *fp, struct uio *uio, struct ucred *active_cred,
238 int flags, struct thread *td)
241 return ((*fp->f_ops->fo_write)(fp, uio, active_cred, flags, td));
245 fo_truncate(struct file *fp, off_t length, struct ucred *active_cred,
249 return ((*fp->f_ops->fo_truncate)(fp, length, active_cred, td));
253 fo_ioctl(struct file *fp, u_long com, void *data, struct ucred *active_cred,
257 return ((*fp->f_ops->fo_ioctl)(fp, com, data, active_cred, td));
261 fo_poll(struct file *fp, int events, struct ucred *active_cred,
265 return ((*fp->f_ops->fo_poll)(fp, events, active_cred, td));
269 fo_stat(struct file *fp, struct stat *sb, struct ucred *active_cred,
273 return ((*fp->f_ops->fo_stat)(fp, sb, active_cred, td));
277 fo_close(struct file *fp, struct thread *td)
280 return ((*fp->f_ops->fo_close)(fp, td));
284 fo_kqfilter(struct file *fp, struct knote *kn)
287 return ((*fp->f_ops->fo_kqfilter)(fp, kn));
292 #endif /* !SYS_FILE_H */