misc/lnstat.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _LNSTAT_H
   3 #define _LNSTAT_H
   4
   5 #include <limits.h>
   6 #include <sys/select.h>
   7
   8 #define PROC_NET_STAT   "/proc/net/stat"
   9
  10 #define LNSTAT_MAX_FILES                        32
  11 #define LNSTAT_MAX_FIELDS_PER_LINE              32
  12 #define LNSTAT_MAX_FIELD_NAME_LEN               32
  13
  14 struct lnstat_file;
  15
  16 struct lnstat_field {
  17         struct lnstat_file *file;
  18         unsigned int num;                       /* field number in line */
  19         char name[LNSTAT_MAX_FIELD_NAME_LEN+1];
  20         unsigned long values[2];                /* two buffers for values */
  21         unsigned long result;
  22 };
  23
  24 struct lnstat_file {
  25         struct lnstat_file *next;
  26         char path[PATH_MAX+1];
  27         char basename[NAME_MAX+1];
  28         struct timeval last_read;               /* last time of read */
  29         struct timeval interval;                /* interval */
  30         int compat;                             /* 1 == backwards compat mode */
  31         FILE *fp;
  32         unsigned int num_fields;                /* number of fields */
  33         struct lnstat_field fields[LNSTAT_MAX_FIELDS_PER_LINE];
  34 };
  35
  36
  37 struct lnstat_file *lnstat_scan_dir(const char *path, const int num_req_files,
  38                                     const char **req_files);
  39 int lnstat_update(struct lnstat_file *lnstat_files);
  40 int lnstat_dump(FILE *outfd, struct lnstat_file *lnstat_files);
  41 struct lnstat_field *lnstat_find_field(struct lnstat_file *lnstat_files,
  42                                        const char *name);
  43 #endif /* _LNSTAT_H */