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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 #include "tc_common.h"
26 
27 static void est_help(void);
28 
est_help(void)29 static void est_help(void)
30 {
31 	fprintf(stderr, "Usage: ... estimator INTERVAL TIME-CONST\n");
32 	fprintf(stderr, "  INTERVAL is interval between measurements\n");
33 	fprintf(stderr, "  TIME-CONST is averaging time constant\n");
34 	fprintf(stderr, "Example: ... est 1sec 8sec\n");
35 }
36 
parse_estimator(int * p_argc,char *** p_argv,struct tc_estimator * est)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 int 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_time(&A, *argv))
49 		invarg("estimator", "invalid estimator interval");
50 	NEXT_ARG();
51 	if (matches(*argv, "help") == 0)
52 		est_help();
53 	if (get_time(&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 		return -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 }
65