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33 * @(#)file.h 8.3 (Berkeley) 1/9/95
34 * $FreeBSD: src/sys/sys/file.h,v 1.22.2.7 2002/11/21 23:39:24 sam Exp $
35 * $DragonFly: src/sys/sys/file.h,v 1.2 2003/06/17 04:28:58 dillon Exp $
42 #include <sys/fcntl.h>
43 #include <sys/unistd.h>
47 #include <sys/queue.h>
55 * Kernel descriptor table.
56 * One entry for each open kernel vnode and socket.
59 LIST_ENTRY(file) f_list;/* list of active files */
60 short f_FILLER3; /* (old f_flag) */
61 #define DTYPE_VNODE 1 /* file */
62 #define DTYPE_SOCKET 2 /* communications endpoint */
63 #define DTYPE_PIPE 3 /* pipe */
64 #define DTYPE_FIFO 4 /* fifo (named pipe) */
65 #define DTYPE_KQUEUE 5 /* event queue */
66 #define DTYPE_CRYPTO 6 /* crypto */
67 short f_type; /* descriptor type */
68 u_int f_flag; /* see fcntl.h */
69 struct ucred *f_cred; /* credentials associated with descriptor */
71 int (*fo_read) __P((struct file *fp, struct uio *uio,
72 struct ucred *cred, int flags,
74 int (*fo_write) __P((struct file *fp, struct uio *uio,
75 struct ucred *cred, int flags,
78 int (*fo_ioctl) __P((struct file *fp, u_long com,
79 caddr_t data, struct proc *p));
80 int (*fo_poll) __P((struct file *fp, int events,
81 struct ucred *cred, struct proc *p));
82 int (*fo_kqfilter) __P((struct file *fp,
84 int (*fo_stat) __P((struct file *fp, struct stat *sb,
86 int (*fo_close) __P((struct file *fp, struct proc *p));
89 * count of sequential accesses -- cleared
90 * by most seek operations.
93 * offset of next expected read or write
96 caddr_t f_data; /* vnode or socket */
97 int f_count; /* reference count */
98 int f_msgcount; /* reference count from message queue */
101 #ifdef MALLOC_DECLARE
102 MALLOC_DECLARE(M_FILE);
105 LIST_HEAD(filelist, file);
106 extern struct filelist filehead; /* head of list of open files */
107 extern struct fileops vnops;
108 extern struct fileops badfileops;
109 extern int maxfiles; /* kernel limit on number of open files */
110 extern int maxfilesperproc; /* per process limit on number of open files */
111 extern int nfiles; /* actual number of open files */
113 static __inline void fhold __P((struct file *fp));
114 int fdrop __P((struct file *fp, struct proc *p));
124 static __inline int fo_read __P((struct file *fp, struct uio *uio,
125 struct ucred *cred, int flags, struct proc *p));
126 static __inline int fo_write __P((struct file *fp, struct uio *uio,
127 struct ucred *cred, int flags, struct proc *p));
128 static __inline int fo_ioctl __P((struct file *fp, u_long com, caddr_t data,
130 static __inline int fo_poll __P((struct file *fp, int events,
131 struct ucred *cred, struct proc *p));
132 static __inline int fo_stat __P((struct file *fp, struct stat *sb,
134 static __inline int fo_close __P((struct file *fp, struct proc *p));
135 static __inline int fo_kqfilter __P((struct file *fp, struct knote *kn));
138 fo_read(fp, uio, cred, flags, p)
148 error = (*fp->f_ops->fo_read)(fp, uio, cred, flags, p);
154 fo_write(fp, uio, cred, flags, p)
164 error = (*fp->f_ops->fo_write)(fp, uio, cred, flags, p);
170 fo_ioctl(fp, com, data, p)
179 error = (*fp->f_ops->fo_ioctl)(fp, com, data, p);
185 fo_poll(fp, events, cred, p)
194 error = (*fp->f_ops->fo_poll)(fp, events, cred, p);
208 error = (*fp->f_ops->fo_stat)(fp, sb, p);
219 return ((*fp->f_ops->fo_close)(fp, p));
228 return ((*fp->f_ops->fo_kqfilter)(fp, kn));
233 #endif /* !SYS_FILE_H */