glibc/elf/link.h
Ulrich Drepper e07bb02a4f Update.
2003-09-15  Jakub Jelinek  <jakub@redhat.com>

	* argp/argp.h (argp_parse, __argp_parse): Remove __THROW.
	* argp/Makefile (CFLAGS-argp-help.c, CFLAGS-argp-parse.c): Add
	$(uses-callbacks).
	* dirent/Makefile (CFLAGS-scandir.c, CFLAGS-scandir64.c): Likewise.
	* elf/Makefile (CFLAGS-dl-iterate-phdr.c,
	CFLAGS-dl-iterate-phdr-static.c): Add $(uses-callbacks).
	* elf/dl-iteratephdr.c (cancel_handler): New function.
	(__dl_iterate_phdr): Add __libc_cleanup_{push,pop}.
	* elf/link.h (dl_iterate_phdr): Remove __THROW.
	* io/Makefile (CFLAGS-fts.c): Merge into one assignment.
	Add $(uses-callbacks).
	(CFLAGS-ftw.c, CFLAGS-ftw64.c): Add $(uses-callbacks).
	* misc/Makefile (CFLAGS-tsearch.c, CFLAGS-lsearch.c): Change
	$(exceptions) to $(uses-callbacks).
	* Makeconfig (uses-callbacks): Set to $(exceptions).
	* posix/Makefile (CFLAGS-glob.c, CFLAGS-glob64.c): Add
	$(uses-callbacks).
	* stdlib/Makefile (CFLAGS-bsearch.c, CFLAGS-msort.c, CFLAGS-qsort.c):
	Likewise.
2003-09-16 05:54:09 +00:00

116 lines
4.0 KiB
C

/* Data structure for communication from the run-time dynamic linker for
loaded ELF shared objects.
Copyright (C) 1995-1999, 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. */
#ifndef _LINK_H
#define _LINK_H 1
#include <features.h>
#include <elf.h>
#include <dlfcn.h>
#include <sys/types.h>
/* We use this macro to refer to ELF types independent of the native wordsize.
`ElfW(TYPE)' is used in place of `Elf32_TYPE' or `Elf64_TYPE'. */
#define ElfW(type) _ElfW (Elf, __ELF_NATIVE_CLASS, type)
#define _ElfW(e,w,t) _ElfW_1 (e, w, _##t)
#define _ElfW_1(e,w,t) e##w##t
#include <bits/elfclass.h> /* Defines __ELF_NATIVE_CLASS. */
/* Rendezvous structure used by the run-time dynamic linker to communicate
details of shared object loading to the debugger. If the executable's
dynamic section has a DT_DEBUG element, the run-time linker sets that
element's value to the address where this structure can be found. */
struct r_debug
{
int r_version; /* Version number for this protocol. */
struct link_map *r_map; /* Head of the chain of loaded objects. */
/* This is the address of a function internal to the run-time linker,
that will always be called when the linker begins to map in a
library or unmap it, and again when the mapping change is complete.
The debugger can set a breakpoint at this address if it wants to
notice shared object mapping changes. */
ElfW(Addr) r_brk;
enum
{
/* This state value describes the mapping change taking place when
the `r_brk' address is called. */
RT_CONSISTENT, /* Mapping change is complete. */
RT_ADD, /* Beginning to add a new object. */
RT_DELETE /* Beginning to remove an object mapping. */
} r_state;
ElfW(Addr) r_ldbase; /* Base address the linker is loaded at. */
};
/* This is the instance of that structure used by the dynamic linker. */
extern struct r_debug _r_debug;
/* This symbol refers to the "dynamic structure" in the `.dynamic' section
of whatever module refers to `_DYNAMIC'. So, to find its own
`struct r_debug', a program could do:
for (dyn = _DYNAMIC; dyn->d_tag != DT_NULL; ++dyn)
if (dyn->d_tag == DT_DEBUG)
r_debug = (struct r_debug *) dyn->d_un.d_ptr;
*/
extern ElfW(Dyn) _DYNAMIC[];
/* Structure describing a loaded shared object. The `l_next' and `l_prev'
members form a chain of all the shared objects loaded at startup.
These data structures exist in space used by the run-time dynamic linker;
modifying them may have disastrous results. */
struct link_map
{
/* These first few members are part of the protocol with the debugger.
This is the same format used in SVR4. */
ElfW(Addr) l_addr; /* Base address shared object is loaded at. */
char *l_name; /* Absolute file name object was found in. */
ElfW(Dyn) *l_ld; /* Dynamic section of the shared object. */
struct link_map *l_next, *l_prev; /* Chain of loaded objects. */
};
#ifdef __USE_GNU
struct dl_phdr_info
{
ElfW(Addr) dlpi_addr;
const char *dlpi_name;
const ElfW(Phdr) *dlpi_phdr;
ElfW(Half) dlpi_phnum;
};
__BEGIN_DECLS
extern int dl_iterate_phdr (int (*callback) (struct dl_phdr_info *info,
size_t size, void *data),
void *data);
__END_DECLS
#endif
#endif /* link.h */