]>
sourceware.org Git - glibc.git/blob - dlfcn/dlsym.c
1 /* Look up a symbol in a shared object loaded by `dlopen'.
2 Copyright (C) 1995-2024 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <https://www.gnu.org/licenses/>. */
21 #include <shlib-compat.h>
26 /* The arguments to dlsym_doit. */
31 /* The return value of dlsym_doit. */
38 struct dlsym_args
*args
= (struct dlsym_args
*) a
;
40 args
->sym
= _dl_sym (args
->handle
, args
->name
, args
->who
);
44 dlsym_implementation (void *handle
, const char *name
, void *dl_caller
)
46 struct dlsym_args args
;
51 /* Protect against concurrent loads and unloads. */
52 __rtld_lock_lock_recursive (GL(dl_load_lock
));
54 void *result
= (_dlerror_run (dlsym_doit
, &args
) ? NULL
: args
.sym
);
56 __rtld_lock_unlock_recursive (GL(dl_load_lock
));
63 ___dlsym (void *handle
, const char *name
)
65 if (GLRO (dl_dlfcn_hook
) != NULL
)
66 return GLRO (dl_dlfcn_hook
)->dlsym (handle
, name
, RETURN_ADDRESS (0));
68 return dlsym_implementation (handle
, name
, RETURN_ADDRESS (0));
70 versioned_symbol (libc
, ___dlsym
, dlsym
, GLIBC_2_34
);
72 # if OTHER_SHLIB_COMPAT (libdl, GLIBC_2_0, GLIBC_2_34)
73 compat_symbol (libdl
, ___dlsym
, dlsym
, GLIBC_2_0
);
77 /* Also used with _dlfcn_hook. */
79 __dlsym (void *handle
, const char *name
, void *dl_caller
)
81 return dlsym_implementation (handle
, name
, dl_caller
);
85 ___dlsym (void *handle
, const char *name
)
87 return __dlsym (handle
, name
, RETURN_ADDRESS (0));
89 weak_alias (___dlsym
, dlsym
)
This page took 0.045955 seconds and 6 git commands to generate.