mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-14 07:10:05 +00:00
3f80a33b99
1999-02-16 Andreas Jaeger <aj@arthur.rhein-neckar.de> * elf/dlfcn.h: Fix typo. * sysdeps/generic/bits/dlfcn.h: Likewise. * sysdeps/mips/bits/dlfcn.h: Likewise.
101 lines
3.8 KiB
C
101 lines
3.8 KiB
C
/* User functions for run-time dynamic loading.
|
|
Copyright (C) 1995, 1996, 1997, 1998, 1999 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. */
|
|
|
|
#ifndef _DLFCN_H
|
|
#define _DLFCN_H 1
|
|
|
|
#include <features.h>
|
|
#define __need_NULL
|
|
#include <stddef.h>
|
|
|
|
/* Collect various system dependent definitions and declarations. */
|
|
#include <bits/dlfcn.h>
|
|
|
|
/* If the first argument of `dlsym' or `dlvsym' is set to RTLD_NEXT
|
|
the run-time address of the symbol called NAME in the next shared
|
|
object is returned. The "next" relation is defined by the order
|
|
the shared objects were loaded. */
|
|
#define RTLD_NEXT ((void *) -1l)
|
|
|
|
/* If the first argument to `dlsym' or `dlvsym' is set to RTLD_DEFAULT
|
|
the run-time address of the symbol called NAME in the global scope
|
|
is returned. */
|
|
#define RTLD_DEFAULT NULL
|
|
|
|
__BEGIN_DECLS
|
|
|
|
/* Open the shared object FILE and map it in; return a handle that can be
|
|
passed to `dlsym' to get symbol values from it. */
|
|
extern void *dlopen __P ((__const char *__file, int __mode));
|
|
|
|
/* Unmap and close a shared object opened by `dlopen'.
|
|
The handle cannot be used again after calling `dlclose'. */
|
|
extern int dlclose __P ((void *__handle));
|
|
|
|
/* Find the run-time address in the shared object HANDLE refers to
|
|
of the symbol called NAME. */
|
|
extern void *dlsym __P ((void *__restrict __handle,
|
|
__const char *__restrict __name));
|
|
|
|
#ifdef __USE_GNU
|
|
/* Find the run-time address in the shared object HANDLE refers to
|
|
of the symbol called NAME with VERSION. */
|
|
extern void *dlvsym __P ((void *__restrict __handle,
|
|
__const char *__restrict __name,
|
|
__const char *__restrict __version));
|
|
#endif
|
|
|
|
/* When any of the above functions fails, call this function
|
|
to return a string describing the error. Each call resets
|
|
the error string so that a following call returns null. */
|
|
extern char *dlerror __P ((void));
|
|
|
|
#ifdef __USE_GNU
|
|
/* Fill in *INFO with the following information about ADDRESS.
|
|
Returns 0 iff no shared object's segments contain that address. */
|
|
typedef struct
|
|
{
|
|
__const char *dli_fname; /* File name of defining object. */
|
|
void *dli_fbase; /* Load address of that object. */
|
|
__const char *dli_sname; /* Name of nearest symbol. */
|
|
void *dli_saddr; /* Exact value of nearest symbol. */
|
|
} Dl_info;
|
|
extern int dladdr __P ((const void *__address, Dl_info *__info));
|
|
|
|
/* To support profiling of shared objects it is a good idea to call
|
|
the function found using `dlsym' using the following macro since
|
|
these calls do not use the PLT. But this would mean the dynamic
|
|
loader has no chance to find out when the function is called. The
|
|
macro applies the necessary magic so that profiling is possible.
|
|
Rewrite
|
|
foo = (*fctp) (arg1, arg2);
|
|
into
|
|
foo = DL_CALL_FCT (fctp, (arg1, arg2));
|
|
*/
|
|
# define DL_CALL_FCT(fctp, args) \
|
|
(_dl_mcount_wrapper_check (fctp), (*(fctp)) args)
|
|
|
|
/* This function calls the profiling functions. */
|
|
extern void _dl_mcount_wrapper_check __P ((void *__selfpc));
|
|
#endif
|
|
|
|
__END_DECLS
|
|
|
|
#endif /* dlfcn.h */
|