lsmod.c

   1 /* lsmod.c: list the status of kernel modules.
   2     Copyright (C) 2002  Rusty Russell, IBM Corporation.
   3
   4     This program is free software; you can redistribute it and/or modify
   5     it under the terms of the GNU General Public License as published by
   6     the Free Software Foundation; either version 2 of the License, or
   7     (at your option) any later version.
   8
   9     This program is distributed in the hope that it will be useful,
  10     but WITHOUT ANY WARRANTY; without even the implied warranty of
  11     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12     GNU General Public License for more details.
  13
  14     You should have received a copy of the GNU General Public License
  15     along with this program; if not, write to the Free Software
  16     Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  17 */
  18 #include <stdio.h>
  19 #include <string.h>
  20 #include <stdlib.h>
  21 #include <unistd.h>
  22 #include <fcntl.h>
  23 #include <sys/mman.h>
  24 #include <sys/types.h>
  25 #include <sys/stat.h>
  26 #include <errno.h>
  27 #include <ctype.h>
  28 #include <asm/unistd.h>
  29
  30 #include "testing.h"
  31
  32 static void print_usage(const char *progname)
  33 {
  34         fprintf(stderr, "Usage: %s\n", progname);
  35         exit(1);
  36 }
  37
  38 int main(int argc, char *argv[])
  39 {
  40         char line[4096];
  41         FILE *file;
  42
  43         if (argc != 1)
  44                 print_usage("lsmod");
  45
  46         file = fopen("/proc/modules", "r");
  47         if (!file) {
  48                 perror("Opening /proc/modules");
  49                 exit(1);
  50         }
  51
  52         printf("Module                  Size  Used by\n");
  53         while (fgets(line, sizeof(line), file)) {
  54                 char *tok;
  55
  56                 tok = strtok(line, " \t");
  57                 printf("%-19s", tok);
  58                 tok = strtok(NULL, " \t\n");
  59                 printf(" %8s", tok);
  60                 tok = strtok(NULL, " \t\n");
  61                 /* Null if no module unloading support. */
  62                 if (tok) {
  63                         printf("  %s", tok);
  64                         tok = strtok(NULL, "\n");
  65                         if (!tok)
  66                                 tok = "";
  67                         /* New-style has commas, or -.  If so,
  68                            truncate (other fields might follow). */
  69                         else if (strchr(tok, ',')) {
  70                                 tok = strtok(tok, "\t ");
  71                                 /* Strip trailing comma. */
  72                                 if (tok[strlen(tok)-1] == ',')
  73                                         tok[strlen(tok)-1] = '\0';
  74                         } else if (tok[0] == '-'
  75                                    && (tok[1] == '\0' || isspace(tok[1])))
  76                                 tok = "";
  77                         printf(" %s", tok);
  78                 }
  79                 printf("\n");
  80         }
  81         fclose(file);
  82         exit(0);
  83 }