lib/libutil/kld.c

   1 /*-
   2  * Copyright (c) 2006 Dag-Erling Coïdan Smørgrav
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer
  10  *    in this position and unchanged.
  11  * 2. Redistributions in binary form must reproduce the above copyright
  12  *    notice, this list of conditions and the following disclaimer in the
  13  *    documentation and/or other materials provided with the distribution.
  14  *
  15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  16  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  17  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  18  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  19  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  20  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  21  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  22  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  23  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  24  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  25  * SUCH DAMAGE.
  26  *
  27  * $FreeBSD$
  28  */
  29
  30 #include <sys/param.h>
  31 #include <sys/linker.h>
  32 #include <sys/module.h>
  33
  34 #include <errno.h>
  35 #include <libutil.h>
  36 #include <string.h>
  37
  38 int
  39 kld_isloaded(const char *name)
  40 {
  41         struct kld_file_stat fstat;
  42         struct module_stat mstat;
  43         const char *ko;
  44         int fid, mid;
  45
  46         for (fid = kldnext(0); fid > 0; fid = kldnext(fid)) {
  47                 fstat.version = sizeof(fstat);
  48                 if (kldstat(fid, &fstat) != 0)
  49                         continue;
  50                 /* check if the file name matches the supplied name */
  51                 if (strcmp(fstat.name, name) == 0)
  52                         return (1);
  53                 /* strip .ko and try again */
  54                 if ((ko = strstr(fstat.name, ".ko")) != NULL &&
  55                     strlen(name) == (size_t)(ko - fstat.name) &&
  56                     strncmp(fstat.name, name, ko - fstat.name) == 0)
  57                         return (1);
  58                 /* look for a matching module within the file */
  59                 for (mid = kldfirstmod(fid); mid > 0; mid = modfnext(mid)) {
  60                         mstat.version = sizeof(mstat);
  61                         if (modstat(mid, &mstat) != 0)
  62                                 continue;
  63                         if (strcmp(mstat.name, name) == 0)
  64                                 return (1);
  65                 }
  66         }
  67         return (0);
  68 }
  69
  70 int
  71 kld_load(const char *name)
  72 {
  73         if (kldload(name) == -1 && errno != EEXIST)
  74                 return (-1);
  75         return (0);
  76 }