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/* Storage management for the chain of loaded shared objects.
Copyright (C) 1995, 1996, 1997, 1998 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 Library General Public License as
published by the Free Software Foundation; either version 2 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB. 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 <elf/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 = calloc (sizeof *new, 1);
struct libname_list *newname = malloc (sizeof *newname + libname_len);
if (! new || ! newname)
return NULL;
new->l_name = realname;
newname->name = memcpy (newname + 1, libname, libname_len);
newname->next = NULL;
new->l_libname = newname;
new->l_type = type;
new->l_loader = loader;
/* Counter for the scopes we have to handle. */
idx = 0;
if (_dl_loaded != NULL)
{
l = _dl_loaded;
while (l->l_next)
l = l->l_next;
new->l_prev = l;
/* new->l_next = NULL; Would be necesary but we use calloc. */
l->l_next = new;
/* Add the global scope. */
new->l_scope[idx++] = &_dl_loaded->l_searchlist;
}
/* This is our local scope. */
if (loader != NULL)
{
while (loader->l_loader != NULL)
loader = loader->l_loader;
new->l_scope[idx] = &loader->l_searchlist;
}
else
new->l_scope[idx] = &new->l_searchlist;
new->l_local_scope[0] = new->l_scope[idx];
/* Don't try to find the origin for the main map which has the name "". */
if (realname[0] != '\0')
{
char *origin;
if (realname[0] == '/')
{
/* It an absolute path. Use it. But we have to make a copy since
we strip out the trailing slash. */
size_t len = strlen (realname) + 1;
origin = malloc (len);
if (origin == NULL)
origin = (char *) -1;
else
memcpy (origin, realname, len);
}
else
{
size_t realname_len = strlen (realname) + 1;
size_t len = 128 + realname_len;
char *result = NULL;
/* Get the current directory name. */
origin = malloc (len);
while (origin != NULL
&& (result = __getcwd (origin, len - realname_len)) == NULL
&& errno == ERANGE)
{
len += 128;
origin = (char *) realloc (origin, len);
}
if (result == NULL)
{
/* We were not able to determine the current directory. */
if (origin != NULL)
free (origin);
origin = (char *) -1;
}
else
{
/* Now append the filename. */
char *cp = strchr (origin, '\0');
if (cp [-1] != '/')
*cp++ = '/';
memcpy (cp, realname, realname_len);
}
}
if (origin != (char *) -1)
{
/* Now remove the filename and the slash. Do this even if the
string is something like "/foo" which leaves an empty string. */
char *last = strrchr (origin, '/');
if (last == origin)
origin[1] = '\0';
else
*last = '\0';
}
new->l_origin = origin;
}
return new;
}
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