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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/_lock.h>
43 #include <sys/_mutex.h>
55 #define DTYPE_VNODE 1 /* file */
56 #define DTYPE_SOCKET 2 /* communications endpoint */
57 #define DTYPE_PIPE 3 /* pipe */
58 #define DTYPE_FIFO 4 /* fifo (named pipe) */
59 #define DTYPE_KQUEUE 5 /* event queue */
60 #define DTYPE_CRYPTO 6 /* crypto */
61 #define DTYPE_MQUEUE 7 /* posix message queue */
62 #define DTYPE_SEM 9 /* posix semaphore */
69 typedef int fo_rdwr_t(struct file *fp, struct uio *uio,
70 struct ucred *active_cred, int flags,
72 #define FOF_OFFSET 1 /* Use the offset in uio argument */
73 typedef int fo_ioctl_t(struct file *fp, u_long com, void *data,
74 struct ucred *active_cred, struct thread *td);
75 typedef int fo_poll_t(struct file *fp, int events,
76 struct ucred *active_cred, struct thread *td);
77 typedef int fo_kqfilter_t(struct file *fp, struct knote *kn);
78 typedef int fo_stat_t(struct file *fp, struct stat *sb,
79 struct ucred *active_cred, struct thread *td);
80 typedef int fo_close_t(struct file *fp, struct thread *td);
81 typedef int fo_flags_t;
88 fo_kqfilter_t *fo_kqfilter;
91 fo_flags_t fo_flags; /* DFLAG_* below */
94 #define DFLAG_PASSABLE 0x01 /* may be passed via unix sockets. */
95 #define DFLAG_SEEKABLE 0x02 /* seekable / nonsequential */
98 * Kernel descriptor table.
99 * One entry for each open kernel vnode and socket.
101 * Below is the list of locks that protects members in struct file.
104 * (f) f_mtx in struct file
110 LIST_ENTRY(file) f_list;/* (fl) list of active files */
111 short f_type; /* descriptor type */
112 void *f_data; /* file descriptor specific data */
113 u_int f_flag; /* see fcntl.h */
114 struct mtx *f_mtxp; /* mutex to protect data */
115 struct fileops *f_ops; /* File operations */
116 struct ucred *f_cred; /* credentials associated with descriptor */
117 int f_count; /* (f) reference count */
118 struct vnode *f_vnode; /* NULL or applicable vnode */
120 /* DFLAG_SEEKABLE specific fields */
122 short f_vnread_flags; /*
123 * (f) home grown sleep lock for f_offset
124 * Used only for shared vnode locking in
127 #define FOFFSET_LOCKED 0x1
128 #define FOFFSET_LOCK_WAITING 0x2
129 /* DTYPE_SOCKET specific fields */
130 short f_gcflag; /* used by thread doing fd garbage collection */
131 #define FMARK 0x1 /* mark during gc() */
132 #define FDEFER 0x2 /* defer for next gc pass */
133 #define FWAIT 0x4 /* gc is scanning message buffers */
134 int f_msgcount; /* (f) references from message queue */
136 /* DTYPE_VNODE specific fields */
138 * count of sequential accesses -- cleared
139 * by most seek operations.
142 * offset of next expected read or write
144 void *f_label; /* Place-holder for struct label pointer. */
145 struct cdev_privdata *f_cdevpriv; /* (d) Private data for the cdev. */
151 * Userland version of struct file, for sysctl
154 size_t xf_size; /* size of struct xfile */
155 pid_t xf_pid; /* owning process */
156 uid_t xf_uid; /* effective uid of owning process */
157 int xf_fd; /* descriptor number */
158 void *xf_file; /* address of struct file */
159 short xf_type; /* descriptor type */
160 int xf_count; /* reference count */
161 int xf_msgcount; /* references from message queue */
162 off_t xf_offset; /* file offset */
163 void *xf_data; /* file descriptor specific data */
164 void *xf_vnode; /* vnode pointer */
165 u_int xf_flag; /* flags (see fcntl.h) */
170 #ifdef MALLOC_DECLARE
171 MALLOC_DECLARE(M_FILE);
174 LIST_HEAD(filelist, file);
175 extern struct filelist filehead; /* (fl) head of list of open files */
176 extern struct fileops vnops;
177 extern struct fileops badfileops;
178 extern struct fileops socketops;
179 extern int maxfiles; /* kernel limit on number of open files */
180 extern int maxfilesperproc; /* per process limit on number of open files */
181 extern int openfiles; /* (fl) actual number of open files */
182 extern struct sx filelist_lock; /* sx to protect filelist and openfiles */
184 int fget(struct thread *td, int fd, struct file **fpp);
185 int fget_read(struct thread *td, int fd, struct file **fpp);
186 int fget_write(struct thread *td, int fd, struct file **fpp);
187 int fdrop(struct file *fp, struct thread *td);
190 * The socket operations are used a couple of places.
191 * XXX: This is wrong, they should go through the operations vector for
192 * XXX: sockets instead of going directly for the individual functions. /phk
196 fo_ioctl_t soo_ioctl;
198 fo_kqfilter_t soo_kqfilter;
200 fo_close_t soo_close;
203 #define FILE_LOCK(f) mtx_lock((f)->f_mtxp)
204 #define FILE_UNLOCK(f) mtx_unlock((f)->f_mtxp)
205 #define FILE_LOCKED(f) mtx_owned((f)->f_mtxp)
206 #define FILE_LOCK_ASSERT(f, type) mtx_assert((f)->f_mtxp, (type))
208 int fgetvp(struct thread *td, int fd, struct vnode **vpp);
209 int fgetvp_read(struct thread *td, int fd, struct vnode **vpp);
210 int fgetvp_write(struct thread *td, int fd, struct vnode **vpp);
212 int fgetsock(struct thread *td, int fd, struct socket **spp, u_int *fflagp);
213 void fputsock(struct socket *sp);
215 #define fhold_locked(fp) \
217 FILE_LOCK_ASSERT(fp, MA_OWNED); \
228 static __inline fo_rdwr_t fo_read;
229 static __inline fo_rdwr_t fo_write;
230 static __inline fo_ioctl_t fo_ioctl;
231 static __inline fo_poll_t fo_poll;
232 static __inline fo_kqfilter_t fo_kqfilter;
233 static __inline fo_stat_t fo_stat;
234 static __inline fo_close_t fo_close;
237 fo_read(fp, uio, active_cred, flags, td)
240 struct ucred *active_cred;
245 return ((*fp->f_ops->fo_read)(fp, uio, active_cred, flags, td));
249 fo_write(fp, uio, active_cred, flags, td)
252 struct ucred *active_cred;
257 return ((*fp->f_ops->fo_write)(fp, uio, active_cred, flags, td));
261 fo_ioctl(fp, com, data, active_cred, td)
265 struct ucred *active_cred;
269 return ((*fp->f_ops->fo_ioctl)(fp, com, data, active_cred, td));
273 fo_poll(fp, events, active_cred, td)
276 struct ucred *active_cred;
280 return ((*fp->f_ops->fo_poll)(fp, events, active_cred, td));
284 fo_stat(fp, sb, active_cred, td)
287 struct ucred *active_cred;
291 return ((*fp->f_ops->fo_stat)(fp, sb, active_cred, td));
300 return ((*fp->f_ops->fo_close)(fp, td));
309 return ((*fp->f_ops->fo_kqfilter)(fp, kn));
314 #endif /* !SYS_FILE_H */