1 /* $NetBSD: sharedlib.c,v 1.1.1.2 2009/02/18 11:17:18 haad Exp $ */
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
get_shared_library_path(struct cmd_context * cmd,const char * libname,char * path,size_t path_len)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
load_shared_library(struct cmd_context * cmd,const char * libname,const char * desc,int silent)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 }
70