tools/lsmod.c

   1 /*
   2  * kmod-lsmod - list modules from linux kernel using libkmod.
   3  *
   4  * Copyright (C) 2011-2013  ProFUSION embedded systems
   5  *
   6  * This program is free software: you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation, either version 2 of the License, or
   9  * (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, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #include <errno.h>
  21 #include <stddef.h>
  22 #include <stdio.h>
  23 #include <stdlib.h>
  24 #include <string.h>
  25 #include <unistd.h>
  26
  27 #include <libkmod/libkmod.h>
  28
  29 #include "kmod.h"
  30
  31 static int do_lsmod(int argc, char *argv[])
  32 {
  33         struct kmod_ctx *ctx;
  34         const char *null_config = NULL;
  35         struct kmod_list *list, *itr;
  36         int err;
  37
  38         if (argc != 1) {
  39                 fprintf(stderr, "Usage: %s\n", argv[0]);
  40                 return EXIT_FAILURE;
  41         }
  42
  43         ctx = kmod_new(NULL, &null_config);
  44         if (ctx == NULL) {
  45                 fputs("Error: kmod_new() failed!\n", stderr);
  46                 return EXIT_FAILURE;
  47         }
  48
  49         err = kmod_module_new_from_loaded(ctx, &list);
  50         if (err < 0) {
  51                 fprintf(stderr, "Error: could not get list of modules: %s\n",
  52                         strerror(-err));
  53                 kmod_unref(ctx);
  54                 return EXIT_FAILURE;
  55         }
  56
  57         puts("Module                  Size  Used by");
  58
  59         kmod_list_foreach(itr, list) {
  60                 struct kmod_module *mod = kmod_module_get_module(itr);
  61                 const char *name = kmod_module_get_name(mod);
  62                 int use_count = kmod_module_get_refcnt(mod);
  63                 long size = kmod_module_get_size(mod);
  64                 struct kmod_list *holders, *hitr;
  65                 int first = 1;
  66
  67                 printf("%-19s %8ld  %d", name, size, use_count);
  68                 holders = kmod_module_get_holders(mod);
  69                 kmod_list_foreach(hitr, holders) {
  70                         struct kmod_module *hm = kmod_module_get_module(hitr);
  71
  72                         if (!first) {
  73                                 putchar(',');
  74                         } else {
  75                                 putchar(' ');
  76                                 first = 0;
  77                         }
  78
  79                         fputs(kmod_module_get_name(hm), stdout);
  80                         kmod_module_unref(hm);
  81                 }
  82                 putchar('\n');
  83                 kmod_module_unref_list(holders);
  84                 kmod_module_unref(mod);
  85         }
  86         kmod_module_unref_list(list);
  87         kmod_unref(ctx);
  88
  89         return EXIT_SUCCESS;
  90 }
  91
  92 const struct kmod_cmd kmod_cmd_compat_lsmod = {
  93         .name = "lsmod",
  94         .cmd = do_lsmod,
  95         .help = "compat lsmod command",
  96 };
  97
  98 const struct kmod_cmd kmod_cmd_list = {
  99         .name = "list",
 100         .cmd = do_lsmod,
 101         .help = "list currently loaded modules",
 102 };