2 * Copyright (c) 1982, 1986, 1989, 1993
3 * The Regents of the University of California. All rights reserved.
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15 * This product includes software developed by the University of
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33 * @(#)file.h 8.3 (Berkeley) 1/9/95
41 #include <sys/fcntl.h>
42 #include <sys/unistd.h>
46 #include <sys/types.h>
47 #include <sys/queue.h>
48 #include <sys/_lock.h>
49 #include <sys/_mutex.h>
60 * Kernel descriptor table.
61 * One entry for each open kernel vnode and socket.
63 * Below is the list of locks that protects members in struct file.
66 * (f) f_mtx in struct file
70 LIST_ENTRY(file) f_list;/* (fl) list of active files */
71 short f_gcflag; /* used by thread doing fd garbage collection */
72 #define DTYPE_VNODE 1 /* file */
73 #define DTYPE_SOCKET 2 /* communications endpoint */
74 #define DTYPE_PIPE 3 /* pipe */
75 #define DTYPE_FIFO 4 /* fifo (named pipe) */
76 #define DTYPE_KQUEUE 5 /* event queue */
77 short f_type; /* descriptor type */
78 int f_count; /* (f) reference count */
79 int f_msgcount; /* (f) references from message queue */
80 struct ucred *f_cred; /* credentials associated with descriptor */
82 int (*fo_read) __P((struct file *fp, struct uio *uio,
83 struct ucred *cred, int flags,
85 int (*fo_write) __P((struct file *fp, struct uio *uio,
86 struct ucred *cred, int flags,
89 int (*fo_ioctl) __P((struct file *fp, u_long com,
90 caddr_t data, struct thread *td));
91 int (*fo_poll) __P((struct file *fp, int events,
92 struct ucred *cred, struct thread *td));
93 int (*fo_kqfilter) __P((struct file *fp,
95 int (*fo_stat) __P((struct file *fp, struct stat *sb,
97 int (*fo_close) __P((struct file *fp, struct thread *td));
100 * count of sequential accesses -- cleared
101 * by most seek operations.
104 * offset of next expected read or write
107 caddr_t f_data; /* vnode or socket */
108 u_int f_flag; /* see fcntl.h */
109 struct mtx *f_mtxp; /* mutex to protect data */
112 #ifdef MALLOC_DECLARE
113 MALLOC_DECLARE(M_FILE);
116 LIST_HEAD(filelist, file);
117 extern struct filelist filehead; /* (fl) head of list of open files */
118 extern struct fileops vnops;
119 extern struct fileops badfileops;
120 extern int maxfiles; /* kernel limit on number of open files */
121 extern int maxfilesperproc; /* per process limit on number of open files */
122 extern int nfiles; /* (fl) actual number of open files */
123 extern struct sx filelist_lock; /* sx to protect filelist and nfiles */
125 int fget __P((struct thread *td, int fd, struct file **fpp));
126 int fget_read __P((struct thread *td, int fd, struct file **fpp));
127 int fget_write __P((struct thread *td, int fd, struct file **fpp));
128 int fdrop __P((struct file *fp, struct thread *td));
129 int fdrop_locked __P((struct file *fp, struct thread *td));
132 #define FILE_LOCK(f) mtx_lock((f)->f_mtxp)
133 #define FILE_UNLOCK(f) mtx_unlock((f)->f_mtxp)
134 #define FILE_LOCKED(f) mtx_owned((f)->f_mtxp)
135 #define FILE_LOCK_ASSERT(f, type) mtx_assert((f)->f_mtxp, (type))
137 int fgetvp __P((struct thread *td, int fd, struct vnode **vpp));
138 int fgetvp_read __P((struct thread *td, int fd, struct vnode **vpp));
139 int fgetvp_write __P((struct thread *td, int fd, struct vnode **vpp));
141 int fgetsock __P((struct thread *td, int fd, struct socket **spp, u_int *fflagp));
142 void fputsock __P((struct socket *sp));
144 #define fhold_locked(fp) \
146 FILE_LOCK_ASSERT(fp, MA_OWNED); \
157 static __inline int fo_read __P((struct file *fp, struct uio *uio,
158 struct ucred *cred, int flags, struct thread *td));
159 static __inline int fo_write __P((struct file *fp, struct uio *uio,
160 struct ucred *cred, int flags, struct thread *td));
161 static __inline int fo_ioctl __P((struct file *fp, u_long com, caddr_t data,
163 static __inline int fo_poll __P((struct file *fp, int events,
164 struct ucred *cred, struct thread *td));
165 static __inline int fo_stat __P((struct file *fp, struct stat *sb,
167 static __inline int fo_close __P((struct file *fp, struct thread *td));
168 static __inline int fo_kqfilter __P((struct file *fp, struct knote *kn));
172 fo_read(fp, uio, cred, flags, td)
180 return ((*fp->f_ops->fo_read)(fp, uio, cred, flags, td));
184 fo_write(fp, uio, cred, flags, td)
191 return ((*fp->f_ops->fo_write)(fp, uio, cred, flags, td));
195 fo_ioctl(fp, com, data, td)
201 return ((*fp->f_ops->fo_ioctl)(fp, com, data, td));
205 fo_poll(fp, events, cred, td)
211 /* select(2) and poll(2) hold file descriptors. */
212 return ((*fp->f_ops->fo_poll)(fp, events, cred, td));
221 return ((*fp->f_ops->fo_stat)(fp, sb, td));
230 return ((*fp->f_ops->fo_close)(fp, td));
239 return ((*fp->f_ops->fo_kqfilter)(fp, kn));
244 #endif /* !SYS_FILE_H */