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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/queue.h>
53 * Kernel descriptor table.
54 * One entry for each open kernel vnode and socket.
57 LIST_ENTRY(file) f_list;/* list of active files */
58 short f_flag; /* see fcntl.h */
59 #define DTYPE_VNODE 1 /* file */
60 #define DTYPE_SOCKET 2 /* communications endpoint */
61 #define DTYPE_PIPE 3 /* pipe */
62 #define DTYPE_FIFO 4 /* fifo (named pipe) */
63 short f_type; /* descriptor type */
64 short f_count; /* reference count */
65 short f_msgcount; /* references from message queue */
66 struct ucred *f_cred; /* credentials associated with descriptor */
68 int (*fo_read) __P((struct file *fp, struct uio *uio,
69 struct ucred *cred, int flags,
71 int (*fo_write) __P((struct file *fp, struct uio *uio,
72 struct ucred *cred, int flags,
75 int (*fo_ioctl) __P((struct file *fp, u_long com,
76 caddr_t data, struct proc *p));
77 int (*fo_poll) __P((struct file *fp, int events,
78 struct ucred *cred, struct proc *p));
79 int (*fo_stat) __P((struct file *fp, struct stat *sb,
81 int (*fo_close) __P((struct file *fp, struct proc *p));
84 * count of sequential accesses -- cleared
85 * by most seek operations.
88 * offset of next expected read
91 caddr_t f_data; /* vnode or socket */
95 MALLOC_DECLARE(M_FILE);
98 LIST_HEAD(filelist, file);
99 extern struct filelist filehead; /* head of list of open files */
100 extern struct fileops vnops;
101 extern struct fileops badfileops;
102 extern int maxfiles; /* kernel limit on number of open files */
103 extern int maxfilesperproc; /* per process limit on number of open files */
104 extern int nfiles; /* actual number of open files */
106 static __inline void fhold __P((struct file *fp));
107 int fdrop __P((struct file *fp, struct proc *p));
117 static __inline int fo_read __P((struct file *fp, struct uio *uio,
118 struct ucred *cred, int flags, struct proc *p));
119 static __inline int fo_write __P((struct file *fp, struct uio *uio,
120 struct ucred *cred, int flags, struct proc *p));
121 static __inline int fo_ioctl __P((struct file *fp, u_long com, caddr_t data,
123 static __inline int fo_poll __P((struct file *fp, int events,
124 struct ucred *cred, struct proc *p));
125 static __inline int fo_stat __P((struct file *fp, struct stat *sb,
127 static __inline int fo_close __P((struct file *fp, struct proc *p));
130 fo_read(fp, uio, cred, flags, p)
140 error = (*fp->f_ops->fo_read)(fp, uio, cred, flags, p);
146 fo_write(fp, uio, cred, flags, p)
156 error = (*fp->f_ops->fo_write)(fp, uio, cred, flags, p);
162 fo_ioctl(fp, com, data, p)
171 error = (*fp->f_ops->fo_ioctl)(fp, com, data, p);
177 fo_poll(fp, events, cred, p)
186 error = (*fp->f_ops->fo_poll)(fp, events, cred, p);
200 error = (*fp->f_ops->fo_stat)(fp, sb, p);
211 return ((*fp->f_ops->fo_close)(fp, p));
216 #endif /* !SYS_FILE_H */