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/* dynl.c - dynamic linking
Copyright 1990-2003,2008-2011,2017-2018,2021
Free Software Foundation, Inc.
This file is part of Guile.
Guile is free software: you can redistribute it and/or modify it
under the terms of the GNU Lesser General Public License as published
by the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
Guile 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 Lesser General Public
License for more details.
You should have received a copy of the GNU Lesser General Public
License along with Guile. If not, see
<https://www.gnu.org/licenses/>. */
/* "dynl.c" dynamically link&load object files.
Author: Aubrey Jaffer
Modified for libguile by Marius Vollmer */
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#ifdef __MINGW32__
#include "posix-w32.h"
#define dlopen(_nam,_flg) (dlopen_w32((_nam),(_flg)))
#define dlsym(_hndl,_nam) (dlsym_w32((_hndl),(_nam)))
#define dlclose(_hndl) (dlclose_w32((_hndl)))
#define dlerror() (dlerror_w32())
#else
#include <dlfcn.h>
#endif
#include "boolean.h"
#include "deprecation.h"
#include "eval.h"
#include "extensions.h"
#include "foreign.h"
#include "gsubr.h"
#include "list.h"
#include "modules.h"
#include "numbers.h"
#include "strings.h"
#include "threads.h"
#include "variable.h"
#include "version.h"
#include "dynl.h"
static SCM
dlerror_string (const char *fallback)
{
const char *message = dlerror ();
if (message)
return scm_from_locale_string (message);
return scm_from_utf8_string ("Unknown error");
}
SCM_DEFINE_STATIC (scm_dlopen, "dlopen", 2, 0, 0, (SCM name, SCM flags), "")
#define FUNC_NAME s_scm_dlopen
{
void *handle;
int c_flags = scm_to_int (flags);
if (scm_is_false (name))
handle = dlopen (NULL, c_flags);
else
{
char *c_name = scm_to_locale_string (name);
handle = dlopen (c_name, c_flags);
free (c_name);
}
if (!handle) {
SCM message = dlerror_string ("Unknown error while opening module");
SCM_MISC_ERROR ("file ~S, message ~S", scm_list_2 (name, message));
}
return scm_from_pointer (handle, NULL);
}
#undef FUNC_NAME
SCM_DEFINE_STATIC (scm_dlclose, "dlclose", 1, 0, 0, (SCM obj), "")
#define FUNC_NAME s_scm_dlclose
{
void *handle = scm_to_pointer (obj);
if (dlclose (handle) != 0) {
SCM message = dlerror_string ("Unknown error");
SCM_MISC_ERROR ("Error closing module: ~S", scm_list_1 (message));
}
return SCM_UNSPECIFIED;
}
#undef FUNC_NAME
SCM_DEFINE_STATIC (scm_dlsym, "dlsym", 2, 0, 0, (SCM obj, SCM name), "")
#define FUNC_NAME s_scm_dlsym
{
void *handle = scm_to_pointer (obj);
char *c_name = scm_to_utf8_string (name);
void *sym = dlsym (handle, c_name);
free (c_name);
if (!sym) {
SCM message = dlerror_string ("Unknown error");
SCM_MISC_ERROR ("Error resolving ~S: ~S", scm_list_2 (name, message));
}
return scm_from_pointer (sym, NULL);
}
#undef FUNC_NAME
#define DEFINE_LAZY_VAR(c_name, mod_name, sym_name) \
static SCM c_name##_var; \
static void init_##c_name##_var (void) \
{ \
c_name##_var = scm_c_public_lookup (mod_name, sym_name); \
} \
static SCM c_name (void) \
{ \
static scm_i_pthread_once_t once = SCM_I_PTHREAD_ONCE_INIT; \
scm_i_pthread_once (&once, init_##c_name##_var); \
return scm_variable_ref (c_name##_var); \
}
DEFINE_LAZY_VAR (load_foreign_library,
"system foreign-library", "load-foreign-library");
DEFINE_LAZY_VAR (foreign_library_p,
"system foreign-library", "foreign-library?");
DEFINE_LAZY_VAR (foreign_library_pointer,
"system foreign-library", "foreign-library-pointer");
SCM
scm_dynamic_link (SCM filename)
{
return scm_call_1 (load_foreign_library (), filename);
}
SCM
scm_dynamic_object_p (SCM obj)
{
return scm_call_1 (foreign_library_p (), obj);
}
SCM
scm_dynamic_pointer (SCM name, SCM obj)
{
return scm_call_2 (foreign_library_pointer (), obj, name);
}
SCM
scm_dynamic_func (SCM name, SCM obj)
{
return scm_dynamic_pointer (name, obj);
}
SCM
scm_dynamic_call (SCM name, SCM obj)
{
SCM pointer = scm_dynamic_pointer (name, obj);
void (*f)(void) = SCM_POINTER_VALUE (pointer);
f();
return SCM_UNSPECIFIED;
}
static void
scm_init_system_foreign_library (void *unused)
{
scm_c_define ("RTLD_LAZY", scm_from_int (RTLD_LAZY));
scm_c_define ("RTLD_NOW", scm_from_int (RTLD_NOW));
scm_c_define ("RTLD_GLOBAL", scm_from_int (RTLD_GLOBAL));
scm_c_define ("RTLD_LOCAL", scm_from_int (RTLD_LOCAL));
#include "dynl.x"
}
void
scm_init_dynamic_linking ()
{
scm_c_register_extension ("libguile-" SCM_EFFECTIVE_VERSION,
"scm_init_system_foreign_library",
scm_init_system_foreign_library,
NULL);
// FIXME: Deprecate all of these, once (system foreign-library) has
// had enough time in the world.
scm_c_define_gsubr
("dynamic-link", 0, 1, 0, (scm_t_subr) scm_dynamic_link);
scm_c_define_gsubr
("dynamic-object?", 1, 0, 0, (scm_t_subr) scm_dynamic_object_p);
scm_c_define_gsubr
("dynamic-func", 2, 0, 0, (scm_t_subr) scm_dynamic_func);
scm_c_define_gsubr
("dynamic-pointer", 2, 0, 0, (scm_t_subr) scm_dynamic_pointer);
scm_c_define_gsubr
("dynamic-call", 2, 0, 0, (scm_t_subr) scm_dynamic_call);
}
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