libstatgrab/examples/disk_traffic.c

/*
 * i-scream central monitoring system
 * http://www.i-scream.org
 * Copyright (C) 2000-2003 i-scream
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 */

/* A very basic example of how to get the disk statistics from the system 
 * and diaply them. Also it adds up all the traffic to create and print out
 * a total 
 * Takes several arguments :
 * -d <number>  Takes the number of seconds to wait to get traffic sent since last call
 *              Note, this is not disk traffic per second. Its the traffic since last
 *              call. If you want it traffic per second averaged over time since last call
 *              You need to divide against the time since last time this was called. The time
 *              between 2 calls is stored in systime in the disk_stat_t structure.
 * -b           Display in bytes
 * -k           Display in kilobytes
 * -m           Display in megabytes
 */

#include <stdio.h>
#include <statgrab.h>
#include <stdlib.h>
#include <unistd.h>

int main(int argc, char **argv){

        extern char *optarg;
        extern int optind;
        int c;

        /* We default to 1 second updates and displaying in bytes*/
        int delay = 1;
        char units = 'b';

        diskio_stat_t *diskio_stats;
        int num_diskio_stats;

        /* Parse command line options */
        while ((c = getopt(argc, argv, "d:bkm")) != -1){
                switch (c){
                        case 'd':
                                delay = atoi(optarg);
                                break;
                        case 'b':
                                units = 'b';
                                break;
                        case 'k':
                                units = 'k';    
                                break;
                        case 'm':
                                units = 'm';
                                break;
                }
        }

        /* Initialise statgrab */
        statgrab_init();

        /* Drop setuid/setgid privileges. */
        if (statgrab_drop_privileges() != 0) {
                perror("Error. Failed to drop privileges");
                return 1;
        }

        /* We are not interested in the amount of traffic ever transmitted, just differences. 
         * Because of this, we do nothing for the very first call.
         */

        diskio_stats = get_diskio_stats_diff(&num_diskio_stats);
        if (diskio_stats == NULL){
                perror("Error. Failed to get disk stats");
                return 1;
        }

        /* Clear the screen ready for display the disk stats */
        printf("\033[2J");

        /* Keep getting the disk stats */
        while ( (diskio_stats = get_diskio_stats_diff(&num_diskio_stats)) != NULL){
                int x;
                int line_number = 2;

                long long total_write=0;
                long long total_read=0;

                for(x = 0; x < num_diskio_stats; x++){  
                        /* Print at location 2, linenumber the interface name */
                        printf("\033[%d;2H%-25s : %-10s", line_number++, "Disk Name", diskio_stats->disk_name);
                        /* Print out at the correct location the traffic in the requsted units passed at command time */
                        switch(units){
                                case 'b':
                                        printf("\033[%d;2H%-25s : %8lld b", line_number++, "Disk read", diskio_stats->read_bytes);
                                        printf("\033[%d;2H%-25s : %8lld b", line_number++, "Disk write", diskio_stats->write_bytes);
                                        break;
                                case 'k':
                                        printf("\033[%d;2H%-25s : %5lld k", line_number++, "Disk read", (diskio_stats->read_bytes / 1024));
                                        printf("\033[%d;2H%-25s : %5lld", line_number++, "Disk write", (diskio_stats->write_bytes / 1024));
                                        break;
                                case 'm':
                                        printf("\033[%d;2H%-25s : %5.2f m", line_number++, "Disk read", diskio_stats->read_bytes / (1024.00*1024.00));
                                        printf("\033[%d;2H%-25s : %5.2f m", line_number++, "Disk write", diskio_stats->write_bytes / (1024.00*1024.00));
                        }
                        printf("\033[%d;2H%-25s : %ld ", line_number++, "Disk systime", (long) diskio_stats->systime);

                        /* Add a blank line between interfaces */       
                        line_number++;

                        /* Add up this interface to the total so we can display a "total" disk io" */
                        total_write+=diskio_stats->write_bytes;
                        total_read+=diskio_stats->read_bytes;

                        /* Move the pointer onto the next interface. Since this returns a static buffer, we dont need
                         * to keep track of the orginal pointer to free later */
                        diskio_stats++;
                }

                printf("\033[%d;2H%-25s : %-10s", line_number++, "Disk Name", "Total Disk IO");
                switch(units){
                        case 'b':
                                printf("\033[%d;2H%-25s : %8lld b", line_number++, "Disk Total read", total_read);
                                printf("\033[%d;2H%-25s : %8lld b", line_number++, "Disk Total write", total_write);
                                break;
                        case 'k':
                                printf("\033[%d;2H%-25s : %5lld k", line_number++, "Disk Total read", (total_read / 1024));
                                printf("\033[%d;2H%-25s : %5lld k", line_number++, "Disk Total write", (total_write / 1024));
                                break;
                        case 'm':
                                printf("\033[%d;2H%-25s : %5.2f m", line_number++, "Disk Total read", (total_read  / (1024.00*1024.00)));
                                printf("\033[%d;2H%-25s : %5.2f m", line_number++, "Disk Total write", (total_write  / (1024.00*1024.00)));
                                break;
                }

                fflush(stdout);

                sleep(delay);

        }

        return 0;

}
Revision:	1.5
Committed:	Tue Jan 6 15:35:04 2004 UTC (20 years, 11 months ago) by tdb
Content type:	text/plain
Branch:	MAIN
CVS Tags:	LIBSTATGRAB_0_8
Changes since 1.4:	+6 -0 lines
Log Message:	Add dropping privileges to all the examples.
#	Content
1	/*
2	* i-scream central monitoring system
3	* http://www.i-scream.org
4	* Copyright (C) 2000-2003 i-scream
5	*
6	* This program is free software; you can redistribute it and/or
7	* modify it under the terms of the GNU General Public License
8	* as published by the Free Software Foundation; either version 2
9	* of the License, or (at your option) any later version.
10	*
11	* This program is distributed in the hope that it will be useful,
12	* but WITHOUT ANY WARRANTY; without even the implied warranty of
13	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14	* GNU General Public License for more details.
15	*
16	* You should have received a copy of the GNU General Public License
17	* along with this program; if not, write to the Free Software
18	* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
19	*/
20
21	/* A very basic example of how to get the disk statistics from the system
22	* and diaply them. Also it adds up all the traffic to create and print out
23	* a total
24	* Takes several arguments :
25	* -d <number> Takes the number of seconds to wait to get traffic sent since last call
26	* Note, this is not disk traffic per second. Its the traffic since last
27	* call. If you want it traffic per second averaged over time since last call
28	* You need to divide against the time since last time this was called. The time
29	* between 2 calls is stored in systime in the disk_stat_t structure.
30	* -b Display in bytes
31	* -k Display in kilobytes
32	* -m Display in megabytes
33	*/
34
35	#include <stdio.h>
36	#include <statgrab.h>
37	#include <stdlib.h>
38	#include <unistd.h>
39
40	int main(int argc, char **argv){
41
42	extern char *optarg;
43	extern int optind;
44	int c;
45
46	/* We default to 1 second updates and displaying in bytes*/
47	int delay = 1;
48	char units = 'b';
49
50	diskio_stat_t *diskio_stats;
51	int num_diskio_stats;
52
53	/* Parse command line options */
54	while ((c = getopt(argc, argv, "d:bkm")) != -1){
55	switch (c){
56	case 'd':
57	delay = atoi(optarg);
58	break;
59	case 'b':
60	units = 'b';
61	break;
62	case 'k':
63	units = 'k';
64	break;
65	case 'm':
66	units = 'm';
67	break;
68	}
69	}
70
71	/* Initialise statgrab */
72	statgrab_init();
73
74	/* Drop setuid/setgid privileges. */
75	if (statgrab_drop_privileges() != 0) {
76	perror("Error. Failed to drop privileges");
77	return 1;
78	}
79
80	/* We are not interested in the amount of traffic ever transmitted, just differences.
81	* Because of this, we do nothing for the very first call.
82	*/
83
84	diskio_stats = get_diskio_stats_diff(&num_diskio_stats);
85	if (diskio_stats == NULL){
86	perror("Error. Failed to get disk stats");
87	return 1;
88	}
89
90	/* Clear the screen ready for display the disk stats */
91	printf("\033[2J");
92
93	/* Keep getting the disk stats */
94	while ( (diskio_stats = get_diskio_stats_diff(&num_diskio_stats)) != NULL){
95	int x;
96	int line_number = 2;
97
98	long long total_write=0;
99	long long total_read=0;
100
101	for(x = 0; x < num_diskio_stats; x++){
102	/* Print at location 2, linenumber the interface name */
103	printf("\033[%d;2H%-25s : %-10s", line_number++, "Disk Name", diskio_stats->disk_name);
104	/* Print out at the correct location the traffic in the requsted units passed at command time */
105	switch(units){
106	case 'b':
107	printf("\033[%d;2H%-25s : %8lld b", line_number++, "Disk read", diskio_stats->read_bytes);
108	printf("\033[%d;2H%-25s : %8lld b", line_number++, "Disk write", diskio_stats->write_bytes);
109	break;
110	case 'k':
111	printf("\033[%d;2H%-25s : %5lld k", line_number++, "Disk read", (diskio_stats->read_bytes / 1024));
112	printf("\033[%d;2H%-25s : %5lld", line_number++, "Disk write", (diskio_stats->write_bytes / 1024));
113	break;
114	case 'm':
115	printf("\033[%d;2H%-25s : %5.2f m", line_number++, "Disk read", diskio_stats->read_bytes / (1024.00*1024.00));
116	printf("\033[%d;2H%-25s : %5.2f m", line_number++, "Disk write", diskio_stats->write_bytes / (1024.00*1024.00));
117	}
118	printf("\033[%d;2H%-25s : %ld ", line_number++, "Disk systime", (long) diskio_stats->systime);
119
120	/* Add a blank line between interfaces */
121	line_number++;
122
123	/* Add up this interface to the total so we can display a "total" disk io" */
124	total_write+=diskio_stats->write_bytes;
125	total_read+=diskio_stats->read_bytes;
126
127	/* Move the pointer onto the next interface. Since this returns a static buffer, we dont need
128	* to keep track of the orginal pointer to free later */
129	diskio_stats++;
130	}
131
132	printf("\033[%d;2H%-25s : %-10s", line_number++, "Disk Name", "Total Disk IO");
133	switch(units){
134	case 'b':
135	printf("\033[%d;2H%-25s : %8lld b", line_number++, "Disk Total read", total_read);
136	printf("\033[%d;2H%-25s : %8lld b", line_number++, "Disk Total write", total_write);
137	break;
138	case 'k':
139	printf("\033[%d;2H%-25s : %5lld k", line_number++, "Disk Total read", (total_read / 1024));
140	printf("\033[%d;2H%-25s : %5lld k", line_number++, "Disk Total write", (total_write / 1024));
141	break;
142	case 'm':
143	printf("\033[%d;2H%-25s : %5.2f m", line_number++, "Disk Total read", (total_read / (1024.00*1024.00)));
144	printf("\033[%d;2H%-25s : %5.2f m", line_number++, "Disk Total write", (total_write / (1024.00*1024.00)));
145	break;
146	}
147
148	fflush(stdout);
149
150	sleep(delay);
151
152	}
153
154	return 0;
155
156	}