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      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 
     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 }
     70