1 #ifndef _LINUX_SEQ_FILE_H
2 #define _LINUX_SEQ_FILE_H
4 #include <linux/types.h>
5 #include <linux/string.h>
6 #include <linux/mutex.h>
7 #include <linux/cpumask.h>
8 #include <linux/nodemask.h>
10 struct seq_operations
;
25 const struct seq_operations
*op
;
30 struct seq_operations
{
31 void * (*start
) (struct seq_file
*m
, loff_t
*pos
);
32 void (*stop
) (struct seq_file
*m
, void *v
);
33 void * (*next
) (struct seq_file
*m
, void *v
, loff_t
*pos
);
34 int (*show
) (struct seq_file
*m
, void *v
);
40 * seq_get_buf - get buffer to write arbitrary data to
41 * @m: the seq_file handle
42 * @bufp: the beginning of the buffer is stored here
44 * Return the number of bytes available in the buffer, or zero if
47 static inline size_t seq_get_buf(struct seq_file
*m
, char **bufp
)
49 BUG_ON(m
->count
> m
->size
);
50 if (m
->count
< m
->size
)
51 *bufp
= m
->buf
+ m
->count
;
55 return m
->size
- m
->count
;
59 * seq_commit - commit data to the buffer
60 * @m: the seq_file handle
61 * @num: the number of bytes to commit
63 * Commit @num bytes of data written to a buffer previously acquired
64 * by seq_buf_get. To signal an error condition, or that the data
65 * didn't fit in the available space, pass a negative @num value.
67 static inline void seq_commit(struct seq_file
*m
, int num
)
72 BUG_ON(m
->count
+ num
> m
->size
);
77 char *mangle_path(char *s
, char *p
, char *esc
);
78 int seq_open(struct file
*, const struct seq_operations
*);
79 ssize_t
seq_read(struct file
*, char __user
*, size_t, loff_t
*);
80 loff_t
seq_lseek(struct file
*, loff_t
, int);
81 int seq_release(struct inode
*, struct file
*);
82 int seq_escape(struct seq_file
*, const char *, const char *);
83 int seq_putc(struct seq_file
*m
, char c
);
84 int seq_puts(struct seq_file
*m
, const char *s
);
85 int seq_write(struct seq_file
*seq
, const void *data
, size_t len
);
87 __printf(2, 3) int seq_printf(struct seq_file
*, const char *, ...);
89 int seq_path(struct seq_file
*, struct path
*, char *);
90 int seq_dentry(struct seq_file
*, struct dentry
*, char *);
91 int seq_path_root(struct seq_file
*m
, struct path
*path
, struct path
*root
,
93 int seq_bitmap(struct seq_file
*m
, const unsigned long *bits
,
94 unsigned int nr_bits
);
95 static inline int seq_cpumask(struct seq_file
*m
, const struct cpumask
*mask
)
97 return seq_bitmap(m
, cpumask_bits(mask
), nr_cpu_ids
);
100 static inline int seq_nodemask(struct seq_file
*m
, nodemask_t
*mask
)
102 return seq_bitmap(m
, mask
->bits
, MAX_NUMNODES
);
105 int seq_bitmap_list(struct seq_file
*m
, const unsigned long *bits
,
106 unsigned int nr_bits
);
108 static inline int seq_cpumask_list(struct seq_file
*m
,
109 const struct cpumask
*mask
)
111 return seq_bitmap_list(m
, cpumask_bits(mask
), nr_cpu_ids
);
114 static inline int seq_nodemask_list(struct seq_file
*m
, nodemask_t
*mask
)
116 return seq_bitmap_list(m
, mask
->bits
, MAX_NUMNODES
);
119 int single_open(struct file
*, int (*)(struct seq_file
*, void *), void *);
120 int single_release(struct inode
*, struct file
*);
121 void *__seq_open_private(struct file
*, const struct seq_operations
*, int);
122 int seq_open_private(struct file
*, const struct seq_operations
*, int);
123 int seq_release_private(struct inode
*, struct file
*);
125 #define SEQ_START_TOKEN ((void *)1)
128 * Helpers for iteration over list_head-s in seq_files
131 extern struct list_head
*seq_list_start(struct list_head
*head
,
133 extern struct list_head
*seq_list_start_head(struct list_head
*head
,
135 extern struct list_head
*seq_list_next(void *v
, struct list_head
*head
,
139 * Helpers for iteration over hlist_head-s in seq_files
142 extern struct hlist_node
*seq_hlist_start(struct hlist_head
*head
,
144 extern struct hlist_node
*seq_hlist_start_head(struct hlist_head
*head
,
146 extern struct hlist_node
*seq_hlist_next(void *v
, struct hlist_head
*head
,
149 extern struct hlist_node
*seq_hlist_start_rcu(struct hlist_head
*head
,
151 extern struct hlist_node
*seq_hlist_start_head_rcu(struct hlist_head
*head
,
153 extern struct hlist_node
*seq_hlist_next_rcu(void *v
,
154 struct hlist_head
*head
,
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