mirror of
https://github.com/autc04/Retro68.git
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164 lines
4.5 KiB
C
164 lines
4.5 KiB
C
/* Storage management for the chain of loaded shared objects.
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Copyright (C) 1995,96,97,98,99,2000,2001 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 Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the 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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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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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 <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;
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struct libname_list *newname;
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new = (struct link_map *) calloc (sizeof (*new) + sizeof (*newname)
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+ libname_len, 1);
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if (new == NULL)
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return NULL;
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new->l_libname = newname = (struct libname_list *) (new + 1);
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newname->name = (char *) memcpy (newname + 1, libname, libname_len);
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/* newname->next = NULL; We use calloc therefore not necessary. */
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newname->dont_free = 1;
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new->l_name = realname;
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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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/* Use the 'l_scope_mem' array by default for the the 'l_scope'
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information. If we need more entries we will allocate a large
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array dynamically. */
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new->l_scope = new->l_scope_mem;
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new->l_scope_max = sizeof (new->l_scope_mem) / sizeof (new->l_scope_mem[0]);
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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 != NULL)
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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 necessary 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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++_dl_nloaded;
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/* If we have no loader the new object acts as it. */
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if (loader == NULL)
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loader = new;
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else
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/* Determine the local scope. */
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while (loader->l_loader != NULL)
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loader = loader->l_loader;
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/* Insert the scope if it isn't the global scope we already added. */
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if (idx == 0 || &loader->l_searchlist != new->l_scope[0])
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new->l_scope[idx] = &loader->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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size_t realname_len = strlen (realname) + 1;
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char *origin;
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char *cp;
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if (realname[0] == '/')
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{
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/* It is an absolute path. Use it. But we have to make a
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copy since we strip out the trailing slash. */
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cp = origin = (char *) malloc (realname_len);
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if (origin == NULL)
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{
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origin = (char *) -1;
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goto out;
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}
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}
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else
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{
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size_t len = realname_len;
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char *result = NULL;
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/* Get the current directory name. */
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origin = NULL;
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do
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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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while (origin != NULL
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&& (result = getcwd (origin, len - realname_len)) == NULL
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&& errno == ERANGE);
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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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Note that free(origin) is OK if origin == NULL. */
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free (origin);
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origin = (char *) -1;
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goto out;
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}
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/* Find the end of the path and see whether we have to add
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a slash. */
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cp = memchr (origin, '\0', strlen(origin));
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if (cp[-1] != '/')
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*cp++ = '/';
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}
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/* Add the real file name. */
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memcpy (cp, realname, realname_len);
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/* Now remove the filename and the slash. Leave the slash if it
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the name is something like "/foo". */
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cp = strrchr (origin, '/');
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if (cp == origin)
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origin[1] = '\0';
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else
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*cp = '\0';
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out:
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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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