tc/m_estimator.c

   1 /*
   2  * m_estimator.c        Parse/print estimator module options.
   3  *
   4  *              This program is free software; you can u32istribute it and/or
   5  *              modify it under the terms of the GNU General Public License
   6  *              as published by the Free Software Foundation; either version
   7  *              2 of the License, or (at your option) any later version.
   8  *
   9  * Authors:     Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
  10  *
  11  */
  12
  13 #include <stdio.h>
  14 #include <stdlib.h>
  15 #include <unistd.h>
  16 #include <fcntl.h>
  17 #include <sys/socket.h>
  18 #include <netinet/in.h>
  19 #include <arpa/inet.h>
  20 #include <string.h>
  21
  22 #include "utils.h"
  23 #include "tc_util.h"
  24 #include "tc_common.h"
  25
  26 static void est_help(void);
  27
  28 static void est_help(void)
  29 {
  30         fprintf(stderr, "Usage: ... estimator INTERVAL TIME-CONST\n");
  31         fprintf(stderr, "  INTERVAL is interval between measurements\n");
  32         fprintf(stderr, "  TIME-CONST is averaging time constant\n");
  33         fprintf(stderr, "Example: ... est 1sec 8sec\n");
  34 }
  35
  36 int parse_estimator(int *p_argc, char ***p_argv, struct tc_estimator *est)
  37 {
  38         int argc = *p_argc;
  39         char **argv = *p_argv;
  40         unsigned int A, time_const;
  41
  42         NEXT_ARG();
  43         if (est->ewma_log)
  44                 duparg("estimator", *argv);
  45         if (matches(*argv, "help") == 0)
  46                 est_help();
  47         if (get_time(&A, *argv))
  48                 invarg("estimator", "invalid estimator interval");
  49         NEXT_ARG();
  50         if (matches(*argv, "help") == 0)
  51                 est_help();
  52         if (get_time(&time_const, *argv))
  53                 invarg("estimator", "invalid estimator time constant");
  54         if (tc_setup_estimator(A, time_const, est) < 0) {
  55                 fprintf(stderr, "Error: estimator parameters are out of range.\n");
  56                 return -1;
  57         }
  58         if (show_raw)
  59                 fprintf(stderr, "[estimator i=%u e=%u]\n", est->interval, est->ewma_log);
  60         *p_argc = argc;
  61         *p_argv = argv;
  62         return 0;
  63 }