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disk_traffic.c

/*
 * i-scream libstatgrab
 * http://www.i-scream.org
 * Copyright (C) 2000-2004 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.
 *
 * $Id: disk_traffic.c,v 1.10 2004/04/06 14:52:56 tdb Exp $
 */

/* 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;
      int c;

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

      sg_disk_io_stats *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 */
      sg_init();

      /* Drop setuid/setgid privileges. */
      if (sg_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 = sg_get_disk_io_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 = sg_get_disk_io_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;

}

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