1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420
|
/*
Copyright (C) 2004-2016 John E. Davis
This file is part of the S-Lang Library.
The S-Lang Library is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.
The S-Lang 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
General Public License for more details.
You should have received a copy of the GNU General Public License
along with this library; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
USA.
*/
#include "slinclud.h"
#include "slang.h"
#include "_slang.h"
#if defined (HAVE_DLFCN_H) || defined(__WIN32__)
# define SLANG_HAS_DYNAMIC_LINKING 1
#else
# define SLANG_HAS_DYNAMIC_LINKING 0
#endif
/* The rest of this file is in the if block */
#if SLANG_HAS_DYNAMIC_LINKING
#ifdef HAVE_DLFCN_H
# include <dlfcn.h>
#endif
#ifdef __WIN32__
# include <windows.h>
# define dlopen(a, b) LoadLibrary(a)
# define dlsym (void *)GetProcAddress
# define dlclose FreeLibrary
# define dlerror() NULL
# define SO_SUFFIX "dll"
#else
# define SO_SUFFIX "so"
#endif
static SLFUTURE_CONST char *Module_Path;
#ifndef MODULE_PATH_ENV_NAME
# define MODULE_PATH_ENV_NAME "SLANG_MODULE_PATH"
#endif
#ifndef MODULE_INSTALL_DIR
# define MODULE_INSTALL_DIR "/usr/local/lib/slang/v2/modules"
#endif
#define MAX_MODULE_NAME_SIZE 256
typedef struct Namespace_List_Type
{
char *ns;
struct Namespace_List_Type *next;
}
Namespace_List_Type;
typedef struct _Handle_Type
{
struct _Handle_Type *next;
char *module_name;
VOID_STAR handle;
int (*ns_init_fun) (SLCONST char *);
void (*deinit_fun) (void);
Namespace_List_Type *ns_list;
}
Handle_Type;
static Handle_Type *Handle_List;
static void free_namespace_list (Namespace_List_Type *ns_list)
{
while (ns_list != NULL)
{
Namespace_List_Type *next = ns_list->next;
SLang_free_slstring (ns_list->ns);
SLfree ((char *)ns_list);
ns_list = next;
}
}
static void free_handle_type (Handle_Type *h)
{
if (h == NULL)
return;
SLang_free_slstring (h->module_name);
free_namespace_list (h->ns_list);
SLfree ((char *)h);
}
static void delete_handles (void)
{
while (Handle_List != NULL)
{
Handle_Type *next = Handle_List->next;
if (Handle_List->deinit_fun != NULL)
Handle_List->deinit_fun ();
/* (void) dlclose (Handle_List->handle); */
free_handle_type (Handle_List);
Handle_List = next;
}
}
static Handle_Type *allocate_handle_type (SLFUTURE_CONST char *module_name, VOID_STAR handle)
{
Handle_Type *h;
h = (Handle_Type *) SLcalloc (1, sizeof (Handle_Type));
if (h == NULL)
return NULL;
if (NULL == (h->module_name = SLang_create_slstring (module_name)))
{
SLfree ((char *) h);
return NULL;
}
h->handle = handle;
return h;
}
static Handle_Type *find_handle (SLCONST char *module_name)
{
Handle_Type *l;
l = Handle_List;
while (l != NULL)
{
if (0 == strcmp (l->module_name, module_name))
break;
l = l->next;
}
return l;
}
static int check_api_version (char *file, int api_version)
{
if (api_version/10000 == SLANG_VERSION/10000)
return 0;
_pSLang_verror (SL_Import_Error, "Module %s is incompatible with this version of S-Lang",
file);
return -1;
}
#if defined(__GNUC__)
# pragma GCC diagnostic ignored "-Wformat-nonliteral"
#endif
static VOID_STAR do_dlsym (VOID_STAR handle, SLFUTURE_CONST char *file, int check_error, SLFUTURE_CONST char *fmt, char *module)
{
char symbol[MAX_MODULE_NAME_SIZE + 32];
VOID_STAR s;
SLsnprintf (symbol, sizeof(symbol), fmt, module);
if (NULL != (s = (VOID_STAR) dlsym (handle, symbol)))
return s;
if (check_error)
{
SLCONST char *err;
if (NULL == (err = (char *) dlerror ()))
err = "UNKNOWN";
_pSLang_verror (SL_Import_Error,
"Unable to get symbol %s from %s: %s",
symbol, file, err);
}
return NULL;
}
#if defined(__GNUC__)
# pragma GCC diagnostic warning "-Wformat-nonliteral"
#endif
static Handle_Type *dynamic_link_module (SLFUTURE_CONST char *module)
{
Handle_Type *h;
VOID_STAR handle;
SLFUTURE_CONST char *err;
char filebuf[1024];
char *save_file;
char *save_err;
int api_version;
int *api_version_ptr;
#define MAX_MODULE_NAME_SIZE 256
char module_so[MAX_MODULE_NAME_SIZE + 32];
char *module_name;
char *file, *pathfile;
if (strlen (module) >= MAX_MODULE_NAME_SIZE)
{
_pSLang_verror (SL_LimitExceeded_Error, "module name too long");
return NULL;
}
SLsnprintf (module_so, sizeof(module_so), "%s-module.%s", module, SO_SUFFIX);
if (Module_Path != NULL)
pathfile = SLpath_find_file_in_path (Module_Path, module_so);
else pathfile = NULL;
if ((pathfile == NULL)
&& (NULL != (pathfile = _pSLsecure_getenv (MODULE_PATH_ENV_NAME))))
pathfile = SLpath_find_file_in_path (pathfile, module_so);
if (pathfile == NULL)
pathfile = SLpath_find_file_in_path (MODULE_INSTALL_DIR, module_so);
if (pathfile != NULL)
file = pathfile;
else
file = module_so;
save_err = NULL;
save_file = file;
while (1)
{
#ifndef RTLD_GLOBAL
# define RTLD_GLOBAL 0
#endif
#ifdef RTLD_NOW
handle = (VOID_STAR) dlopen (file, RTLD_NOW | RTLD_GLOBAL);
#else
handle = (VOID_STAR) dlopen (file, RTLD_LAZY | RTLD_GLOBAL);
#endif
if (handle != NULL)
{
if (_pSLang_Load_File_Verbose & SLANG_LOAD_MODULE_VERBOSE)
SLang_vmessage ("Importing %s", file);
if (save_err != NULL)
SLfree (save_err);
break;
}
/* Purify reports that dlerror returns a pointer that generates UMR
* errors. There is nothing that I can do about that....
*/
if ((NULL == strchr (file, '/'))
&& (strlen(file) < sizeof(filebuf)))
{
err = (char *) dlerror ();
if (err != NULL)
save_err = SLmake_string (err);
SLsnprintf (filebuf, sizeof (filebuf), "./%s", file);
file = filebuf;
continue;
}
if ((NULL == (err = save_err))
&& (NULL == (err = (char *) dlerror ())))
err = "UNKNOWN";
_pSLang_verror (SL_Import_Error,
"Error linking to %s: %s", save_file, err);
if (save_err != NULL)
SLfree (save_err);
if (pathfile != NULL)
SLfree (pathfile);
return NULL;
}
/* Using SLpath_basename allows, e.g., import ("/path/to/module"); */
module_name = SLpath_basename (module);
api_version_ptr = (int *) do_dlsym (handle, file, 0, "SLmodule_%s_api_version", module_name);
if (api_version_ptr == NULL)
api_version_ptr = (int *) do_dlsym (handle, file, 0, "_SLmodule_%s_api_version", module_name);
if (api_version_ptr == NULL)
api_version = 0;
else
api_version = *api_version_ptr;
if ((-1 == check_api_version (file, api_version))
|| (NULL == (h = allocate_handle_type (module, handle))))
{
SLfree (pathfile); /* NULL ok */
dlclose (handle);
return NULL;
}
if (NULL == (h->ns_init_fun = (int (*)(SLCONST char *)) do_dlsym (handle, file, 1, "init_%s_module_ns", module_name)))
{
SLfree (pathfile);
free_handle_type (h);
dlclose (handle);
return NULL;
}
h->deinit_fun = (void (*)(void)) do_dlsym (handle, file, 0, "deinit_%s_module", module_name);
SLfree (pathfile); /* NULL ok */
h->next = Handle_List;
Handle_List = h;
return h;
}
static int import_module (SLFUTURE_CONST char *module, SLFUTURE_CONST char *ns)
{
Handle_Type *h;
Namespace_List_Type *ns_list;
if (ns == NULL)
ns = _pSLang_cur_namespace_intrinsic ();
if (*ns == 0)
ns = "Global";
if ((NULL == (h = find_handle (module)))
&& (NULL == (h = dynamic_link_module (module))))
return -1;
ns_list = h->ns_list;
while (ns_list != NULL)
{
if (0 == strcmp (ns, ns_list->ns))
return 0; /* already linked to this ns */
ns_list = ns_list->next;
}
if (NULL == (ns_list = (Namespace_List_Type *)SLmalloc (sizeof (Namespace_List_Type))))
return -1;
if (NULL == (ns_list->ns = SLang_create_slstring (ns)))
{
SLfree ((char *)ns_list);
return -1;
}
ns_list->next = h->ns_list;
h->ns_list = ns_list;
if (-1 == (h->ns_init_fun (ns)))
return -1;
return 0;
}
static void import_module_intrin (void)
{
char *module;
char *ns = NULL;
if (SLang_Num_Function_Args == 2)
{
if (-1 == SLang_pop_slstring (&ns))
return;
}
if (-1 == SLang_pop_slstring (&module))
{
SLang_free_slstring (ns); /* NULL ok */
return;
}
(void) import_module (module, ns);
SLang_free_slstring (module);
SLang_free_slstring (ns); /* NULL ok */
}
static void set_import_module_path (char *path)
{
(void) SLang_set_module_load_path (path);
}
static SLCONST char *get_import_module_path (void)
{
char *path;
if (Module_Path != NULL)
return Module_Path;
if (NULL != (path = _pSLsecure_getenv (MODULE_PATH_ENV_NAME)))
return path;
return MODULE_INSTALL_DIR;
}
static SLang_Intrin_Fun_Type Module_Intrins [] =
{
MAKE_INTRINSIC_0("import", import_module_intrin, SLANG_VOID_TYPE),
MAKE_INTRINSIC_S("set_import_module_path", set_import_module_path, SLANG_VOID_TYPE),
MAKE_INTRINSIC_0("get_import_module_path", get_import_module_path, SLANG_STRING_TYPE),
SLANG_END_INTRIN_FUN_TABLE
};
#endif /* SLANG_HAS_DYNAMIC_LINKING */
int SLang_set_module_load_path (SLFUTURE_CONST char *path)
{
#if SLANG_HAS_DYNAMIC_LINKING
if (NULL == (path = SLang_create_slstring (path)))
return -1;
SLang_free_slstring ((char *) Module_Path);
Module_Path = path;
return 0;
#else
(void) path;
return -1;
#endif
}
int SLang_init_import (void)
{
#if SLANG_HAS_DYNAMIC_LINKING
(void) SLang_add_cleanup_function (delete_handles);
return SLadd_intrin_fun_table (Module_Intrins, "__IMPORT__");
#else
return 0;
#endif
}
|