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