224 lines
6.6 KiB
C
224 lines
6.6 KiB
C
#ifndef _LINUX_SEQ_FILE_H
|
|
#define _LINUX_SEQ_FILE_H
|
|
|
|
#include <linux/types.h>
|
|
#include <linux/string.h>
|
|
#include <linux/bug.h>
|
|
#include <linux/mutex.h>
|
|
#include <linux/cpumask.h>
|
|
#include <linux/nodemask.h>
|
|
#include <linux/fs.h>
|
|
#include <linux/cred.h>
|
|
|
|
struct seq_operations;
|
|
|
|
struct seq_file {
|
|
char *buf;
|
|
size_t size;
|
|
size_t from;
|
|
size_t count;
|
|
size_t pad_until;
|
|
loff_t index;
|
|
loff_t read_pos;
|
|
u64 version;
|
|
struct mutex lock;
|
|
const struct seq_operations *op;
|
|
int poll_event;
|
|
const struct file *file;
|
|
void *private;
|
|
};
|
|
|
|
struct seq_operations {
|
|
void * (*start) (struct seq_file *m, loff_t *pos);
|
|
void (*stop) (struct seq_file *m, void *v);
|
|
void * (*next) (struct seq_file *m, void *v, loff_t *pos);
|
|
int (*show) (struct seq_file *m, void *v);
|
|
};
|
|
|
|
#define SEQ_SKIP 1
|
|
|
|
/**
|
|
* seq_has_overflowed - check if the buffer has overflowed
|
|
* @m: the seq_file handle
|
|
*
|
|
* seq_files have a buffer which may overflow. When this happens a larger
|
|
* buffer is reallocated and all the data will be printed again.
|
|
* The overflow state is true when m->count == m->size.
|
|
*
|
|
* Returns true if the buffer received more than it can hold.
|
|
*/
|
|
static inline bool seq_has_overflowed(struct seq_file *m)
|
|
{
|
|
return m->count == m->size;
|
|
}
|
|
|
|
/**
|
|
* seq_get_buf - get buffer to write arbitrary data to
|
|
* @m: the seq_file handle
|
|
* @bufp: the beginning of the buffer is stored here
|
|
*
|
|
* Return the number of bytes available in the buffer, or zero if
|
|
* there's no space.
|
|
*/
|
|
static inline size_t seq_get_buf(struct seq_file *m, char **bufp)
|
|
{
|
|
BUG_ON(m->count > m->size);
|
|
if (m->count < m->size)
|
|
*bufp = m->buf + m->count;
|
|
else
|
|
*bufp = NULL;
|
|
|
|
return m->size - m->count;
|
|
}
|
|
|
|
/**
|
|
* seq_commit - commit data to the buffer
|
|
* @m: the seq_file handle
|
|
* @num: the number of bytes to commit
|
|
*
|
|
* Commit @num bytes of data written to a buffer previously acquired
|
|
* by seq_buf_get. To signal an error condition, or that the data
|
|
* didn't fit in the available space, pass a negative @num value.
|
|
*/
|
|
static inline void seq_commit(struct seq_file *m, int num)
|
|
{
|
|
if (num < 0) {
|
|
m->count = m->size;
|
|
} else {
|
|
BUG_ON(m->count + num > m->size);
|
|
m->count += num;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* seq_setwidth - set padding width
|
|
* @m: the seq_file handle
|
|
* @size: the max number of bytes to pad.
|
|
*
|
|
* Call seq_setwidth() for setting max width, then call seq_printf() etc. and
|
|
* finally call seq_pad() to pad the remaining bytes.
|
|
*/
|
|
static inline void seq_setwidth(struct seq_file *m, size_t size)
|
|
{
|
|
m->pad_until = m->count + size;
|
|
}
|
|
void seq_pad(struct seq_file *m, char c);
|
|
|
|
char *mangle_path(char *s, const char *p, const char *esc);
|
|
int seq_open(struct file *, const struct seq_operations *);
|
|
ssize_t seq_read(struct file *, char __user *, size_t, loff_t *);
|
|
loff_t seq_lseek(struct file *, loff_t, int);
|
|
int seq_release(struct inode *, struct file *);
|
|
int seq_write(struct seq_file *seq, const void *data, size_t len);
|
|
|
|
__printf(2, 0)
|
|
void seq_vprintf(struct seq_file *m, const char *fmt, va_list args);
|
|
__printf(2, 3)
|
|
void seq_printf(struct seq_file *m, const char *fmt, ...);
|
|
void seq_putc(struct seq_file *m, char c);
|
|
void seq_puts(struct seq_file *m, const char *s);
|
|
void seq_put_decimal_ull(struct seq_file *m, const char *delimiter,
|
|
unsigned long long num);
|
|
void seq_put_decimal_ll(struct seq_file *m, const char *delimiter, long long num);
|
|
void seq_escape(struct seq_file *m, const char *s, const char *esc);
|
|
|
|
void seq_hex_dump(struct seq_file *m, const char *prefix_str, int prefix_type,
|
|
int rowsize, int groupsize, const void *buf, size_t len,
|
|
bool ascii);
|
|
|
|
int seq_path(struct seq_file *, const struct path *, const char *);
|
|
int seq_file_path(struct seq_file *, struct file *, const char *);
|
|
int seq_dentry(struct seq_file *, struct dentry *, const char *);
|
|
int seq_path_root(struct seq_file *m, const struct path *path,
|
|
const struct path *root, const char *esc);
|
|
|
|
int single_open(struct file *, int (*)(struct seq_file *, void *), void *);
|
|
int single_open_size(struct file *, int (*)(struct seq_file *, void *), void *, size_t);
|
|
int single_release(struct inode *, struct file *);
|
|
void *__seq_open_private(struct file *, const struct seq_operations *, int);
|
|
int seq_open_private(struct file *, const struct seq_operations *, int);
|
|
int seq_release_private(struct inode *, struct file *);
|
|
|
|
static inline struct user_namespace *seq_user_ns(struct seq_file *seq)
|
|
{
|
|
#ifdef CONFIG_USER_NS
|
|
return seq->file->f_cred->user_ns;
|
|
#else
|
|
extern struct user_namespace init_user_ns;
|
|
return &init_user_ns;
|
|
#endif
|
|
}
|
|
|
|
/**
|
|
* seq_show_options - display mount options with appropriate escapes.
|
|
* @m: the seq_file handle
|
|
* @name: the mount option name
|
|
* @value: the mount option name's value, can be NULL
|
|
*/
|
|
static inline void seq_show_option(struct seq_file *m, const char *name,
|
|
const char *value)
|
|
{
|
|
seq_putc(m, ',');
|
|
seq_escape(m, name, ",= \t\n\\");
|
|
if (value) {
|
|
seq_putc(m, '=');
|
|
seq_escape(m, value, ", \t\n\\");
|
|
}
|
|
}
|
|
|
|
/**
|
|
* seq_show_option_n - display mount options with appropriate escapes
|
|
* where @value must be a specific length.
|
|
* @m: the seq_file handle
|
|
* @name: the mount option name
|
|
* @value: the mount option name's value, cannot be NULL
|
|
* @length: the length of @value to display
|
|
*
|
|
* This is a macro since this uses "length" to define the size of the
|
|
* stack buffer.
|
|
*/
|
|
#define seq_show_option_n(m, name, value, length) { \
|
|
char val_buf[length + 1]; \
|
|
strncpy(val_buf, value, length); \
|
|
val_buf[length] = '\0'; \
|
|
seq_show_option(m, name, val_buf); \
|
|
}
|
|
|
|
#define SEQ_START_TOKEN ((void *)1)
|
|
/*
|
|
* Helpers for iteration over list_head-s in seq_files
|
|
*/
|
|
|
|
extern struct list_head *seq_list_start(struct list_head *head,
|
|
loff_t pos);
|
|
extern struct list_head *seq_list_start_head(struct list_head *head,
|
|
loff_t pos);
|
|
extern struct list_head *seq_list_next(void *v, struct list_head *head,
|
|
loff_t *ppos);
|
|
|
|
/*
|
|
* Helpers for iteration over hlist_head-s in seq_files
|
|
*/
|
|
|
|
extern struct hlist_node *seq_hlist_start(struct hlist_head *head,
|
|
loff_t pos);
|
|
extern struct hlist_node *seq_hlist_start_head(struct hlist_head *head,
|
|
loff_t pos);
|
|
extern struct hlist_node *seq_hlist_next(void *v, struct hlist_head *head,
|
|
loff_t *ppos);
|
|
|
|
extern struct hlist_node *seq_hlist_start_rcu(struct hlist_head *head,
|
|
loff_t pos);
|
|
extern struct hlist_node *seq_hlist_start_head_rcu(struct hlist_head *head,
|
|
loff_t pos);
|
|
extern struct hlist_node *seq_hlist_next_rcu(void *v,
|
|
struct hlist_head *head,
|
|
loff_t *ppos);
|
|
|
|
/* Helpers for iterating over per-cpu hlist_head-s in seq_files */
|
|
extern struct hlist_node *seq_hlist_start_percpu(struct hlist_head __percpu *head, int *cpu, loff_t pos);
|
|
|
|
extern struct hlist_node *seq_hlist_next_percpu(void *v, struct hlist_head __percpu *head, int *cpu, loff_t *pos);
|
|
|
|
#endif
|