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 <syslog.h>
  17 #include <fcntl.h>
  18 #include <sys/socket.h>
  19 #include <netinet/in.h>
  20 #include <arpa/inet.h>
  21 #include <string.h>
  22
  23 #include "utils.h"
  24 #include "tc_util.h"
  25
  26 static void est_help(void) __attribute__((noreturn));
  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         exit(-1);
  35 }
  36
  37 int parse_estimator(int *p_argc, char ***p_argv, struct tc_estimator *est)
  38 {
  39         int argc = *p_argc;
  40         char **argv = *p_argv;
  41         unsigned A, time_const;
  42
  43         NEXT_ARG();
  44         if (est->ewma_log)
  45                 duparg("estimator", *argv);
  46         if (matches(*argv, "help") == 0)
  47                 est_help();
  48         if (get_usecs(&A, *argv))
  49                 invarg("estimator", "invalid estimator interval");
  50         NEXT_ARG();
  51         if (matches(*argv, "help") == 0)
  52                 est_help();
  53         if (get_usecs(&time_const, *argv))
  54                 invarg("estimator", "invalid estimator time constant");
  55         if (tc_setup_estimator(A, time_const, est) < 0) {
  56                 fprintf(stderr, "Error: estimator parameters are out of range.\n");
  57                 exit(-1);
  58         }
  59         if (show_raw)
  60                 fprintf(stderr, "[estimator i=%u e=%u]\n", est->interval, est->ewma_log);
  61         *p_argc = argc;
  62         *p_argv = argv;
  63         return 0;
  64 }