645c4be38a
into libc. This reduces the size of every dynamically linked executable by 248 bytes, and it reduces the size of static executables by a lesser amount. It also eliminates some global namespace pollution. With this change in place, the source for dlfcn.h should probably be moved to "/usr/src/include". I'll save that for another day. Compatibility note: Programs which use dlopen, if compiled on systems with this change, will not run on systems with a libc from prior to this change. Very few programs use dlopen, so I think that is OK.
97 lines
2.7 KiB
C
97 lines
2.7 KiB
C
/*-
|
|
* Copyright (c) 1998 John D. Polstra
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*
|
|
* $Id$
|
|
*/
|
|
|
|
/*
|
|
* Trampolines to services provided by the dynamic linker.
|
|
*/
|
|
|
|
#include <sys/types.h>
|
|
#include <nlist.h> /* XXX - Required by link.h */
|
|
#include <dlfcn.h>
|
|
#include <link.h>
|
|
#include <stddef.h>
|
|
|
|
/*
|
|
* These variables are set by code in crt0.o. For compatibility with
|
|
* old executables, they must be common, not extern.
|
|
*/
|
|
struct ld_entry *__ldso_entry; /* Entry points to dynamic linker */
|
|
int __ldso_version; /* Dynamic linker version number */
|
|
|
|
void *
|
|
dlopen(name, mode)
|
|
const char *name;
|
|
int mode;
|
|
{
|
|
if (__ldso_entry == NULL)
|
|
return NULL;
|
|
return (__ldso_entry->dlopen)(name, mode);
|
|
}
|
|
|
|
int
|
|
dlclose(fd)
|
|
void *fd;
|
|
{
|
|
if (__ldso_entry == NULL)
|
|
return -1;
|
|
return (__ldso_entry->dlclose)(fd);
|
|
}
|
|
|
|
void *
|
|
dlsym(fd, name)
|
|
void *fd;
|
|
const char *name;
|
|
{
|
|
if (__ldso_entry == NULL)
|
|
return NULL;
|
|
if (__ldso_version >= LDSO_VERSION_HAS_DLSYM3) {
|
|
void *retaddr = *(&fd - 1); /* XXX - ABI/machine dependent */
|
|
return (__ldso_entry->dlsym3)(fd, name, retaddr);
|
|
} else
|
|
return (__ldso_entry->dlsym)(fd, name);
|
|
}
|
|
|
|
|
|
const char *
|
|
dlerror()
|
|
{
|
|
if (__ldso_entry == NULL)
|
|
return "Service unavailable";
|
|
return (__ldso_entry->dlerror)();
|
|
}
|
|
|
|
int
|
|
dladdr(addr, dlip)
|
|
const void *addr;
|
|
Dl_info *dlip;
|
|
{
|
|
if (__ldso_entry == NULL || __ldso_version < LDSO_VERSION_HAS_DLADDR)
|
|
return 0;
|
|
return (__ldso_entry->dladdr)(addr, dlip);
|
|
}
|