100 lines
3.7 KiB
C
100 lines
3.7 KiB
C
/* User functions for run-time dynamic loading.
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Copyright (C) 1995, 1996, 1997, 1998 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#ifndef _DLFCN_H
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#define _DLFCN_H 1
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#include <features.h>
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/* Collect various system dependand definitions and declarations. */
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#include <bits/dlfcn.h>
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/* If the first argument of `dlsym' is set to RTLD_NEXT the run-time
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address of the symbol called NAME in the next shared object is
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returned. The "next" relation is defined by the order the shared
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objects were loaded. */
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#define RTLD_NEXT ((void *) -1l)
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__BEGIN_DECLS
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/* Open the shared object FILE and map it in; return a handle that can be
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passed to `dlsym' to get symbol values from it. */
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extern void *dlopen __P ((__const char *__file, int __mode));
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/* Unmap and close a shared object opened by `dlopen'.
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The handle cannot be used again after calling `dlclose'. */
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extern int dlclose __P ((void *__handle));
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/* Find the run-time address in the shared object HANDLE refers to
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of the symbol called NAME. */
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extern void *dlsym __P ((void *__handle, __const char *__name));
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#ifdef __USE_GNU
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/* Find the run-time address in the shared object HANDLE refers to
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of the symbol called NAME with VERSION. */
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extern void *__dlvsym __P ((void *__handle, __const char *__name,
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__const char *__version));
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extern void *dlvsym __P ((void *__handle, __const char *__name,
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__const char *__version));
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#endif
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/* When any of the above functions fails, call this function
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to return a string describing the error. Each call resets
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the error string so that a following call returns null. */
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extern char *dlerror __P ((void));
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/* Fill in *INFO with the following information about ADDRESS.
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Returns 0 iff no shared object's segments contain that address. */
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typedef struct
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{
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__const char *dli_fname; /* File name of defining object. */
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void *dli_fbase; /* Load address of that object. */
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__const char *dli_sname; /* Name of nearest symbol. */
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void *dli_saddr; /* Exact value of nearest symbol. */
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} Dl_info;
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extern int dladdr __P ((const void *__address, Dl_info *__info));
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#ifdef __USE_GNU
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/* To support profiling of shared objects it is a good idea to call
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the function found using `dlsym' using the following macro since
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these calls do not use the PLT. But this would mean the dynamic
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loader has no chance to find out when the function is called. The
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macro applies the necessary magic so that profiling is possible.
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Rewrite
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foo = (*fctp) (arg1, arg2);
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into
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foo = DL_CALL_FCT (fctp, (arg1, arg2));
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*/
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# if __GNUC__ >= 2
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# define DL_CALL_FCT(fctp, args) \
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(__extension__ ({ _dl_mcount_wrapper_check (fctp); \
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(*fctp) args; }))
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# else
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/* This feature is not available without GCC. */
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# define DL_CALL_FCT(fctp, args) (*fctp) args
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# endif
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/* This function calls the profiling functions. */
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extern void _dl_mcount_wrapper_check __P ((void *__selfpc));
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#endif
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__END_DECLS
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#endif /* dlfcn.h */
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