external/gpl2/lvm2/dist/lib/misc/sharedlib.c

   1 /*      $NetBSD$        */
   2
   3 /*
   4  * Copyright (C) 2002-2004 Sistina Software, Inc. All rights reserved.
   5  * Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved.
   6  *
   7  * This file is part of LVM2.
   8  *
   9  * This copyrighted material is made available to anyone wishing to use,
  10  * modify, copy, or redistribute it subject to the terms and conditions
  11  * of the GNU Lesser General Public License v.2.1.
  12  *
  13  * You should have received a copy of the GNU Lesser General Public License
  14  * along with this program; if not, write to the Free Software Foundation,
  15  * Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  16  */
  17
  18 #include "lib.h"
  19 #include "config.h"
  20 #include "lvm-string.h"
  21 #include "sharedlib.h"
  22 #include "toolcontext.h"
  23
  24 #include <limits.h>
  25 #include <sys/stat.h>
  26 #include <dlfcn.h>
  27
  28 void get_shared_library_path(struct cmd_context *cmd, const char *libname,
  29                              char *path, size_t path_len)
  30 {
  31         struct stat info;
  32         const char *lib_dir;
  33
  34         /* If libname doesn't begin with '/' then use lib_dir/libname,
  35          * if present */
  36         if (libname[0] == '/' ||
  37             !(lib_dir = find_config_tree_str(cmd, "global/library_dir", 0)) ||
  38             (dm_snprintf(path, path_len, "%s/%s", lib_dir,
  39                           libname) == -1) || stat(path, &info) == -1)
  40                 strncpy(path, libname, path_len);
  41 }
  42
  43 void *load_shared_library(struct cmd_context *cmd, const char *libname,
  44                           const char *desc, int silent)
  45 {
  46         char path[PATH_MAX];
  47         void *library;
  48
  49         if (is_static()) {
  50                 log_error("Not loading shared %s library %s in static mode.",
  51                           desc, libname);
  52                 return NULL;
  53         }
  54
  55         get_shared_library_path(cmd, libname, path, sizeof(path));
  56
  57         log_very_verbose("Opening shared %s library %s", desc, path);
  58
  59         if (!(library = dlopen(path, RTLD_LAZY | RTLD_GLOBAL))) {
  60                 if (silent && ignorelockingfailure())
  61                         log_verbose("Unable to open external %s library %s: %s",
  62                                     desc, path, dlerror());
  63                 else
  64                         log_error("Unable to open external %s library %s: %s",
  65                                   desc, path, dlerror());
  66         }
  67
  68         return library;
  69 }