85 lines
2.2 KiB
C
85 lines
2.2 KiB
C
/* Look up a versioned symbol in a shared object loaded by `dlopen'.
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Copyright (C) 1995-2000, 2004 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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#include <dlfcn.h>
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#include <stddef.h>
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#include <ldsodefs.h>
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#if !defined SHARED && defined IS_IN_libdl
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void *
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weak_function
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dlvsym (void *handle, const char *name, const char *version_str)
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{
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return __dlvsym (handle, name, version_str, RETURN_ADDRESS (0));
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}
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#else
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struct dlvsym_args
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{
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/* The arguments to dlvsym_doit. */
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void *handle;
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const char *name;
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const char *version;
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void *who;
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/* The return values of dlvsym_doit. */
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void *sym;
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};
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static void
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dlvsym_doit (void *a)
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{
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struct dlvsym_args *args = (struct dlvsym_args *)a;
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args->sym = _dl_vsym (args->handle, args->name, args->version, args->who);
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}
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void *
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__dlvsym (void *handle, const char *name, const char *version_str
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DL_CALLER_DECL)
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{
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# ifdef SHARED
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if (__builtin_expect (_dlfcn_hook != NULL, 0))
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return _dlfcn_hook->dlvsym (handle, name, version_str, DL_CALLER);
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# endif
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struct dlvsym_args args;
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args.handle = handle;
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args.name = name;
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args.who = DL_CALLER;
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args.version = version_str;
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/* Protect against concurrent loads and unloads. */
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__rtld_lock_lock_recursive (GL(dl_load_lock));
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void *result = (_dlerror_run (dlvsym_doit, &args) ? NULL : args.sym);
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__rtld_lock_unlock_recursive (GL(dl_load_lock));
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return result;
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}
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# ifdef SHARED
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weak_alias (__dlvsym, dlvsym)
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# endif
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#endif
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