Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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linux
1#ifndef _LINUX_SEQ_FILE_H
2#define _LINUX_SEQ_FILE_H
3
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>
9
10struct seq_operations;
11struct file;
12struct path;
13struct inode;
14struct dentry;
15
16struct seq_file {
17 char *buf;
18 size_t size;
19 size_t from;
20 size_t count;
21 loff_t index;
22 loff_t read_pos;
23 u64 version;
24 struct mutex lock;
25 const struct seq_operations *op;
26 void *private;
27};
28
29struct seq_operations {
30 void * (*start) (struct seq_file *m, loff_t *pos);
31 void (*stop) (struct seq_file *m, void *v);
32 void * (*next) (struct seq_file *m, void *v, loff_t *pos);
33 int (*show) (struct seq_file *m, void *v);
34};
35
36#define SEQ_SKIP 1
37
38/**
39 * seq_get_buf - get buffer to write arbitrary data to
40 * @m: the seq_file handle
41 * @bufp: the beginning of the buffer is stored here
42 *
43 * Return the number of bytes available in the buffer, or zero if
44 * there's no space.
45 */
46static inline size_t seq_get_buf(struct seq_file *m, char **bufp)
47{
48 BUG_ON(m->count > m->size);
49 if (m->count < m->size)
50 *bufp = m->buf + m->count;
51 else
52 *bufp = NULL;
53
54 return m->size - m->count;
55}
56
57/**
58 * seq_commit - commit data to the buffer
59 * @m: the seq_file handle
60 * @num: the number of bytes to commit
61 *
62 * Commit @num bytes of data written to a buffer previously acquired
63 * by seq_buf_get. To signal an error condition, or that the data
64 * didn't fit in the available space, pass a negative @num value.
65 */
66static inline void seq_commit(struct seq_file *m, int num)
67{
68 if (num < 0) {
69 m->count = m->size;
70 } else {
71 BUG_ON(m->count + num > m->size);
72 m->count += num;
73 }
74}
75
76char *mangle_path(char *s, char *p, char *esc);
77int seq_open(struct file *, const struct seq_operations *);
78ssize_t seq_read(struct file *, char __user *, size_t, loff_t *);
79loff_t seq_lseek(struct file *, loff_t, int);
80int seq_release(struct inode *, struct file *);
81int seq_escape(struct seq_file *, const char *, const char *);
82int seq_putc(struct seq_file *m, char c);
83int seq_puts(struct seq_file *m, const char *s);
84int seq_write(struct seq_file *seq, const void *data, size_t len);
85
86int seq_printf(struct seq_file *, const char *, ...)
87 __attribute__ ((format (printf,2,3)));
88
89int seq_path(struct seq_file *, struct path *, char *);
90int seq_dentry(struct seq_file *, struct dentry *, char *);
91int seq_path_root(struct seq_file *m, struct path *path, struct path *root,
92 char *esc);
93int seq_bitmap(struct seq_file *m, const unsigned long *bits,
94 unsigned int nr_bits);
95static inline int seq_cpumask(struct seq_file *m, const struct cpumask *mask)
96{
97 return seq_bitmap(m, cpumask_bits(mask), nr_cpu_ids);
98}
99
100static inline int seq_nodemask(struct seq_file *m, nodemask_t *mask)
101{
102 return seq_bitmap(m, mask->bits, MAX_NUMNODES);
103}
104
105int seq_bitmap_list(struct seq_file *m, const unsigned long *bits,
106 unsigned int nr_bits);
107
108static inline int seq_cpumask_list(struct seq_file *m,
109 const struct cpumask *mask)
110{
111 return seq_bitmap_list(m, cpumask_bits(mask), nr_cpu_ids);
112}
113
114static inline int seq_nodemask_list(struct seq_file *m, nodemask_t *mask)
115{
116 return seq_bitmap_list(m, mask->bits, MAX_NUMNODES);
117}
118
119int single_open(struct file *, int (*)(struct seq_file *, void *), void *);
120int single_release(struct inode *, struct file *);
121void *__seq_open_private(struct file *, const struct seq_operations *, int);
122int seq_open_private(struct file *, const struct seq_operations *, int);
123int seq_release_private(struct inode *, struct file *);
124
125#define SEQ_START_TOKEN ((void *)1)
126
127/*
128 * Helpers for iteration over list_head-s in seq_files
129 */
130
131extern struct list_head *seq_list_start(struct list_head *head,
132 loff_t pos);
133extern struct list_head *seq_list_start_head(struct list_head *head,
134 loff_t pos);
135extern struct list_head *seq_list_next(void *v, struct list_head *head,
136 loff_t *ppos);
137
138/*
139 * Helpers for iteration over hlist_head-s in seq_files
140 */
141
142extern struct hlist_node *seq_hlist_start(struct hlist_head *head,
143 loff_t pos);
144extern struct hlist_node *seq_hlist_start_head(struct hlist_head *head,
145 loff_t pos);
146extern struct hlist_node *seq_hlist_next(void *v, struct hlist_head *head,
147 loff_t *ppos);
148
149extern struct hlist_node *seq_hlist_start_rcu(struct hlist_head *head,
150 loff_t pos);
151extern struct hlist_node *seq_hlist_start_head_rcu(struct hlist_head *head,
152 loff_t pos);
153extern struct hlist_node *seq_hlist_next_rcu(void *v,
154 struct hlist_head *head,
155 loff_t *ppos);
156#endif