151 lines
4.0 KiB
C
151 lines
4.0 KiB
C
/* Storage management for the chain of loaded shared objects.
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Copyright (C) 1995, 1996, 1997, 1998, 1999 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#include <errno.h>
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#include <string.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <elf/ldsodefs.h>
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#include <assert.h>
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/* Allocate a `struct link_map' for a new object being loaded,
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and enter it into the _dl_loaded list. */
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struct link_map *
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internal_function
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_dl_new_object (char *realname, const char *libname, int type,
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struct link_map *loader)
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{
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struct link_map *l;
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int idx;
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size_t libname_len = strlen (libname) + 1;
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struct link_map *new = calloc (sizeof *new, 1);
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struct libname_list *newname = malloc (sizeof *newname + libname_len);
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if (! new || ! newname)
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return NULL;
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new->l_name = realname;
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newname->name = memcpy (newname + 1, libname, libname_len);
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newname->next = NULL;
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new->l_libname = newname;
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new->l_type = type;
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new->l_loader = loader;
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/* new->l_global = 0; We use calloc therefore not necessary. */
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/* Counter for the scopes we have to handle. */
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idx = 0;
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if (_dl_loaded != NULL)
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{
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l = _dl_loaded;
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while (l->l_next)
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l = l->l_next;
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new->l_prev = l;
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/* new->l_next = NULL; Would be necesary but we use calloc. */
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l->l_next = new;
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/* Add the global scope. */
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new->l_scope[idx++] = &_dl_loaded->l_searchlist;
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}
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else
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_dl_loaded = new;
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/* This is our local scope. */
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if (loader != NULL)
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{
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while (loader->l_loader != NULL)
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loader = loader->l_loader;
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new->l_scope[idx] = &loader->l_searchlist;
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}
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else
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new->l_scope[idx] = &new->l_searchlist;
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new->l_local_scope[0] = &new->l_searchlist;
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/* Don't try to find the origin for the main map which has the name "". */
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if (realname[0] != '\0')
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{
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char *origin;
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if (realname[0] == '/')
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{
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/* It an absolute path. Use it. But we have to make a copy since
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we strip out the trailing slash. */
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size_t len = strlen (realname) + 1;
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origin = malloc (len);
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if (origin == NULL)
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origin = (char *) -1;
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else
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memcpy (origin, realname, len);
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}
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else
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{
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size_t realname_len = strlen (realname) + 1;
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size_t len = 128 + realname_len;
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char *result = NULL;
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/* Get the current directory name. */
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origin = malloc (len);
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while (origin != NULL
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&& (result = __getcwd (origin, len - realname_len)) == NULL
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&& errno == ERANGE)
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{
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len += 128;
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origin = (char *) realloc (origin, len);
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}
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if (result == NULL)
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{
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/* We were not able to determine the current directory. */
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if (origin != NULL)
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free (origin);
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origin = (char *) -1;
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}
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else
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{
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/* Now append the filename. */
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char *cp = strchr (origin, '\0');
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if (cp [-1] != '/')
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*cp++ = '/';
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memcpy (cp, realname, realname_len);
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}
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}
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if (origin != (char *) -1)
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{
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/* Now remove the filename and the slash. Do this even if the
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string is something like "/foo" which leaves an empty string. */
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char *last = strrchr (origin, '/');
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if (last == origin)
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origin[1] = '\0';
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else
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*last = '\0';
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}
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new->l_origin = origin;
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}
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return new;
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}
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