/* SPDX-License-Identifier: GPL-2.0 */

#ifndef _LNSTAT_H

#define _LNSTAT_H

#include <limits.h>

#include <sys/select.h>

#define PROC_NET_STAT	"/proc/net/stat"

#define LNSTAT_MAX_FILES			32

#define LNSTAT_MAX_FIELDS_PER_LINE		32

#define LNSTAT_MAX_FIELD_NAME_LEN		32

struct lnstat_file;

struct lnstat_field {

	struct lnstat_file *file;

	unsigned int num;			/* field number in line */

	char name[LNSTAT_MAX_FIELD_NAME_LEN+1];

	unsigned long values[2];		/* two buffers for values */

	unsigned long result;

};

struct lnstat_file {

	struct lnstat_file *next;

	char path[PATH_MAX+1];

	char basename[NAME_MAX+1];

	struct timeval last_read;		/* last time of read */

	struct timeval interval;		/* interval */

	int compat;				/* 1 == backwards compat mode */

	FILE *fp;

	unsigned int num_fields;		/* number of fields */

	struct lnstat_field fields[LNSTAT_MAX_FIELDS_PER_LINE];

};

struct lnstat_file *lnstat_scan_dir(const char *path, const int num_req_files,

				    const char **req_files);

int lnstat_update(struct lnstat_file *lnstat_files);

int lnstat_dump(FILE *outfd, struct lnstat_file *lnstat_files);

struct lnstat_field *lnstat_find_field(struct lnstat_file *lnstat_files,

				       const char *name);

#endif /* _LNSTAT_H */