source: GPL/trunk/include/linux/seq_file.h

#ifndef _LINUX_SEQ_FILE_H
#define _LINUX_SEQ_FILE_H

#include <linux/string.h>

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 semaphore 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);
};

/**
 * 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;
}

ssize_t seq_read(struct file *, char __user *, size_t, loff_t *);
loff_t seq_lseek(struct file *, loff_t, int);

static inline void seq_printf(struct seq_file *m, const char *fmt, ...) {}
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 *);

#endif /* _LINUX_SEQ_FILE_H */