| /* Storage management for the chain of loaded shared objects. |
| Copyright (C) 1995,96,97,98,99,2000,2001 Free Software Foundation, Inc. |
| This file is part of the GNU C Library. |
| |
| The GNU C Library is free software; you can redistribute it and/or |
| modify it under the terms of the GNU Lesser General Public |
| License as published by the Free Software Foundation; either |
| version 2.1 of the License, or (at your option) any later version. |
| |
| The GNU C Library is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| Lesser General Public License for more details. |
| |
| You should have received a copy of the GNU Lesser General Public |
| License along with the GNU C Library; if not, write to the Free |
| Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA |
| 02111-1307 USA. */ |
| |
| #include <errno.h> |
| #include <string.h> |
| #include <stdlib.h> |
| #include <unistd.h> |
| #include <ldsodefs.h> |
| |
| #include <assert.h> |
| |
| |
| /* Allocate a `struct link_map' for a new object being loaded, |
| and enter it into the _dl_loaded list. */ |
| |
| struct link_map * |
| internal_function |
| _dl_new_object (char *realname, const char *libname, int type, |
| struct link_map *loader) |
| { |
| struct link_map *l; |
| int idx; |
| size_t libname_len = strlen (libname) + 1; |
| struct link_map *new; |
| struct libname_list *newname; |
| |
| new = (struct link_map *) calloc (sizeof (*new) + sizeof (*newname) |
| + libname_len, 1); |
| if (new == NULL) |
| return NULL; |
| |
| new->l_libname = newname = (struct libname_list *) (new + 1); |
| newname->name = (char *) memcpy (newname + 1, libname, libname_len); |
| /* newname->next = NULL; We use calloc therefore not necessary. */ |
| newname->dont_free = 1; |
| |
| new->l_name = realname; |
| new->l_type = type; |
| new->l_loader = loader; |
| /* new->l_global = 0; We use calloc therefore not necessary. */ |
| |
| /* Use the 'l_scope_mem' array by default for the the 'l_scope' |
| information. If we need more entries we will allocate a large |
| array dynamically. */ |
| new->l_scope = new->l_scope_mem; |
| new->l_scope_max = sizeof (new->l_scope_mem) / sizeof (new->l_scope_mem[0]); |
| |
| /* Counter for the scopes we have to handle. */ |
| idx = 0; |
| |
| if (_dl_loaded != NULL) |
| { |
| l = _dl_loaded; |
| while (l->l_next != NULL) |
| l = l->l_next; |
| new->l_prev = l; |
| /* new->l_next = NULL; Would be necessary but we use calloc. */ |
| l->l_next = new; |
| |
| /* Add the global scope. */ |
| new->l_scope[idx++] = &_dl_loaded->l_searchlist; |
| } |
| else |
| _dl_loaded = new; |
| ++_dl_nloaded; |
| |
| /* If we have no loader the new object acts as it. */ |
| if (loader == NULL) |
| loader = new; |
| else |
| /* Determine the local scope. */ |
| while (loader->l_loader != NULL) |
| loader = loader->l_loader; |
| |
| /* Insert the scope if it isn't the global scope we already added. */ |
| if (idx == 0 || &loader->l_searchlist != new->l_scope[0]) |
| new->l_scope[idx] = &loader->l_searchlist; |
| |
| new->l_local_scope[0] = &new->l_searchlist; |
| |
| /* Don't try to find the origin for the main map which has the name "". */ |
| if (realname[0] != '\0') |
| { |
| size_t realname_len = strlen (realname) + 1; |
| char *origin; |
| char *cp; |
| |
| if (realname[0] == '/') |
| { |
| /* It is an absolute path. Use it. But we have to make a |
| copy since we strip out the trailing slash. */ |
| cp = origin = (char *) malloc (realname_len); |
| if (origin == NULL) |
| { |
| origin = (char *) -1; |
| goto out; |
| } |
| } |
| else |
| { |
| size_t len = realname_len; |
| char *result = NULL; |
| |
| /* Get the current directory name. */ |
| origin = NULL; |
| do |
| { |
| len += 128; |
| origin = (char *) realloc (origin, len); |
| } |
| while (origin != NULL |
| && (result = getcwd (origin, len - realname_len)) == NULL |
| && errno == ERANGE); |
| |
| if (result == NULL) |
| { |
| /* We were not able to determine the current directory. |
| Note that free(origin) is OK if origin == NULL. */ |
| free (origin); |
| origin = (char *) -1; |
| goto out; |
| } |
| |
| /* Find the end of the path and see whether we have to add |
| a slash. */ |
| cp = memchr (origin, '\0', strlen(origin)); |
| if (cp[-1] != '/') |
| *cp++ = '/'; |
| } |
| |
| /* Add the real file name. */ |
| memcpy (cp, realname, realname_len); |
| |
| /* Now remove the filename and the slash. Leave the slash if it |
| the name is something like "/foo". */ |
| cp = strrchr (origin, '/'); |
| if (cp == origin) |
| origin[1] = '\0'; |
| else |
| *cp = '\0'; |
| |
| out: |
| new->l_origin = origin; |
| } |
| |
| return new; |
| } |