NetBSD/lib/librumphijack/hijackdlsym.c

58 lines
2.0 KiB
C

/* $NetBSD: hijackdlsym.c,v 1.2 2011/02/25 16:01:41 pooka Exp $ */
/*-
* Copyright (c) 2011 Antti Kantee. 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 ``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.
*/
#include <sys/cdefs.h>
__RCSID("$NetBSD: hijackdlsym.c,v 1.2 2011/02/25 16:01:41 pooka Exp $");
#include <dlfcn.h>
#include "hijack.h"
/*
* This is called from librumpclient in case of LD_PRELOAD.
* It ensures correct RTLD_NEXT.
*
* (note, this module is compiled with -O0 to make sure this
* function is not treated as a tailcall or other optimizations
* applied)
*/
/* why is this indirection required for powerpc ???? */
static void * __noinline
bouncer(void *handle, const char *symbol)
{
return dlsym(handle, symbol);
}
void *
rumphijack_dlsym(void *handle, const char *symbol)
{
return bouncer(handle, symbol);
}