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glibc/elf/dl-object.c
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/* 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, 1); | |
newname = (struct libname_list *) malloc (sizeof *newname + libname_len); | |
if (new == NULL || newname == NULL) | |
return NULL; | |
new->l_name = realname; | |
newname->name = (char *) memcpy (newname + 1, libname, libname_len); | |
newname->next = NULL; | |
newname->dont_free = 0; | |
new->l_libname = newname; | |
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) | |
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; | |
/* This is our local scope. */ | |
if (loader != NULL) | |
{ | |
while (loader->l_loader != NULL) | |
loader = loader->l_loader; | |
if (idx == 0 || &loader->l_searchlist != new->l_scope[0]) | |
new->l_scope[idx] = &loader->l_searchlist; | |
} | |
else if (idx == 0 || &new->l_searchlist != new->l_scope[0]) | |
new->l_scope[idx] = &new->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') | |
{ | |
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 = (char *) 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 = (char *) 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. */ | |
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; | |
} |