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Diffstat (limited to 'include/dlfcn.h')
| -rw-r--r-- | include/dlfcn.h | 98 |
1 files changed, 98 insertions, 0 deletions
diff --git a/include/dlfcn.h b/include/dlfcn.h new file mode 100644 index 000000000..998350baa --- /dev/null +++ b/include/dlfcn.h @@ -0,0 +1,98 @@ +/* User functions for run-time dynamic loading. + Copyright (C) 1995-1999, 2000 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> + +/* 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 ((void *) 0) + +__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 */ |