libkmod/libkmod-loaded.c

   1 /*
   2  * libkmod - interface to kernel module operations
   3  *
   4  * Copyright (C) 2011  ProFUSION embedded systems
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation version 2.1.
   9  *
  10  * This library is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * Lesser General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU Lesser General Public
  16  * License along with this library; if not, write to the Free Software
  17  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  18  */
  19
  20 #include <stdio.h>
  21 #include <stdlib.h>
  22 #include <stddef.h>
  23 #include <stdarg.h>
  24 #include <unistd.h>
  25 #include <errno.h>
  26 #include <string.h>
  27 #include <ctype.h>
  28 #include <inttypes.h>
  29
  30 #include "libkmod.h"
  31 #include "libkmod-private.h"
  32
  33 /**
  34  * SECTION:libkmod-loaded
  35  * @short_description: currently loaded modules
  36  *
  37  * Information about currently loaded modules, as reported by Linux kernel
  38  */
  39 KMOD_EXPORT int kmod_loaded_get_list(struct kmod_ctx *ctx,
  40                                                 struct kmod_list **list)
  41 {
  42         struct kmod_list *l = NULL;
  43         FILE *fp;
  44         char line[4096];
  45
  46         if (ctx == NULL || list == NULL)
  47                 return -ENOENT;
  48
  49         fp = fopen("/proc/modules", "r");
  50         if (fp == NULL) {
  51                 int err = -errno;
  52                 ERR(ctx, "could not open /proc/modules: %s\n", strerror(errno));
  53                 return err;
  54         }
  55
  56         while (fgets(line, sizeof(line), fp)) {
  57                 struct kmod_module *m;
  58                 struct kmod_list *node;
  59                 int err;
  60                 char *saveptr, *name = strtok_r(line, " \t", &saveptr);
  61
  62                 err = kmod_module_new_from_name(ctx, name, &m);
  63                 if (err < 0) {
  64                         ERR(ctx, "could not get module from name '%s': %s\n",
  65                                 name, strerror(-err));
  66                         continue;
  67                 }
  68
  69                 node = kmod_list_append(l, m);
  70                 if (node)
  71                         l = node;
  72                 else {
  73                         ERR(ctx, "out of memory\n");
  74                         kmod_module_unref(m);
  75                 }
  76         }
  77
  78         fclose(fp);
  79         *list = l;
  80
  81         return 0;
  82 }