2005-11-18 05:51:21 +08:00
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/* User functions for run-time dynamic loading.
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Copyright (C) 1995-1999, 2000, 2001 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 Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the 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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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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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 dependent definitions and declarations. */
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#include <sys/dlfcn.h>
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/* If the first argument of `dlsym' or `dlvsym' is set to RTLD_NEXT
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the run-time address of the symbol called NAME in the next shared
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object is returned. The "next" relation is defined by the order
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the shared objects were loaded. */
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# define RTLD_NEXT ((void *) -1l)
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/* If the first argument to `dlsym' or `dlvsym' is set to RTLD_DEFAULT
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the run-time address of the symbol called NAME in the global scope
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is returned. */
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# define RTLD_DEFAULT ((void *) 0)
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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 (__const char *__file, int __mode) __THROW;
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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 (void *__handle) __THROW;
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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 (void *__restrict __handle,
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__const char *__restrict __name) __THROW;
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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 (void *__restrict __handle,
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__const char *__restrict __name,
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__const char *__restrict __version) __THROW;
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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 (void) __THROW;
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/* Structure containing information about object searched using
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`dladdr'. */
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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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/* 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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extern int dladdr (__const void *__address, Dl_info *__info) __THROW;
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__END_DECLS
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#endif /* dlfcn.h */
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