/*
* xmlmodule.c : basic API for dynamic module loading added 2.6.17
*
* See Copyright for the status of this software.
*
* joelwreed@comcast.net
*
* http://www.fortran-2000.com/ArnaudRecipes/sharedlib.html
*/
#define IN_LIBXML
#include "libxml.h"
#include <string.h>
#include <libxml/xmlmemory.h>
#include <libxml/xmlerror.h>
#include <libxml/xmlmodule.h>
#include <libxml/globals.h>
#ifdef LIBXML_MODULES_ENABLED
struct _xmlModule {
unsigned char *name;
void *handle;
};
static void *xmlModulePlatformOpen(const char *name);
static int xmlModulePlatformClose(void *handle);
static int xmlModulePlatformSymbol(void *handle, const char *name, void **result);
/************************************************************************
* *
* module memory error handler *
* *
************************************************************************/
/**
* xmlModuleErrMemory:
* @extra: extra information
*
* Handle an out of memory condition
*/
static void
xmlModuleErrMemory(xmlModulePtr module, const char *extra)
{
const char *name = NULL;
if (module != NULL) {
name = (const char *) module->name;
}
__xmlRaiseError(NULL, NULL, NULL, NULL, NULL, XML_FROM_MODULE,
XML_ERR_NO_MEMORY, XML_ERR_FATAL, NULL, 0, extra,
name, NULL, 0, 0,
"Memory allocation failed : %s\n", extra);
}
/**
* xmlModuleOpen:
* @name: the module name
* @options: a set of xmlModuleOption
*
* Opens a module/shared library given its name or path
* TODO: options are not yet implemented.
*
* Returns a handle for the module or NULL in case of error
*/
xmlModulePtr
xmlModuleOpen(const char *name, int options ATTRIBUTE_UNUSED)
{
xmlModulePtr module;
module = (xmlModulePtr) xmlMalloc(sizeof(xmlModule));
if (module == NULL) {
xmlModuleErrMemory(NULL, "creating module");
return (NULL);
}
memset(module, 0, sizeof(xmlModule));
module->handle = xmlModulePlatformOpen(name);
if (module->handle == NULL) {
xmlFree(module);
__xmlRaiseError(NULL, NULL, NULL, NULL, NULL, XML_FROM_MODULE,
XML_MODULE_OPEN, XML_ERR_FATAL, NULL, 0, 0,
name, NULL, 0, 0, "failed to open %s\n", name);
return(NULL);
}
module->name = xmlStrdup((const xmlChar *) name);
return (module);
}
/**
* xmlModuleSymbol:
* @module: the module
* @name: the name of the symbol
* @symbol: the resulting symbol address
*
* Lookup for a symbol address in the given module
*
* Returns 0 if the symbol was found, or -1 in case of error
*/
int
xmlModuleSymbol(xmlModulePtr module, const char *name, void **symbol)
{
int rc = -1;
if ((NULL == module) || (symbol == NULL)) {
__xmlRaiseError(NULL, NULL, NULL, NULL, NULL, XML_FROM_MODULE,
XML_MODULE_OPEN, XML_ERR_FATAL, NULL, 0, 0,
NULL, NULL, 0, 0, "null parameter\n");
return rc;
}
rc = xmlModulePlatformSymbol(module->handle, name, symbol);
if (rc == -1) {
__xmlRaiseError(NULL, NULL, NULL, NULL, NULL, XML_FROM_MODULE,
XML_MODULE_OPEN, XML_ERR_FATAL, NULL, 0, 0,
name, NULL, 0, 0,
"failed to find symbol: %s\n",
(name == NULL ? "NULL" : name));
return rc;
}
return rc;
}
/**
* xmlModuleClose:
* @module: the module handle
*
* The close operations unload the associated module and free the
* data associated to the module.
*
* Returns 0 in case of success, -1 in case of argument error and -2
* if the module could not be closed/unloaded.
*/
int
xmlModuleClose(xmlModulePtr module)
{
int rc;
if (NULL == module) {
__xmlRaiseError(NULL, NULL, NULL, NULL, NULL, XML_FROM_MODULE,
XML_MODULE_CLOSE, XML_ERR_FATAL, NULL, 0, 0,
NULL, NULL, 0, 0, "null module pointer\n");
return -1;
}
rc = xmlModulePlatformClose(module->handle);
if (rc != 0) {
__xmlRaiseError(NULL, NULL, NULL, NULL, NULL, XML_FROM_MODULE,
XML_MODULE_CLOSE, XML_ERR_FATAL, NULL, 0, 0,
(const char *) module->name, NULL, 0, 0,
"failed to close: %s\n", module->name);
return -2;
}
rc = xmlModuleFree(module);
return (rc);
}
/**
* xmlModuleFree:
* @module: the module handle
*
* The free operations free the data associated to the module
* but does not unload the associated shared library which may still
* be in use.
*
* Returns 0 in case of success, -1 in case of argument error
*/
int
xmlModuleFree(xmlModulePtr module)
{
if (NULL == module) {
__xmlRaiseError(NULL, NULL, NULL, NULL, NULL, XML_FROM_MODULE,
XML_MODULE_CLOSE, XML_ERR_FATAL, NULL, 0, NULL,
NULL, NULL, 0, 0, "null module pointer\n");
return -1;
}
xmlFree(module->name);
xmlFree(module);
return (0);
}
#ifdef HAVE_DLOPEN
#ifdef HAVE_DLFCN_H
#include <dlfcn.h>
#endif
#ifndef RTLD_GLOBAL /* For Tru64 UNIX 4.0 */
#define RTLD_GLOBAL 0
#endif
/**
* xmlModulePlatformOpen:
* @name: path to the module
*
* returns a handle on success, and zero on error.
*/
static void *
xmlModulePlatformOpen(const char *name)
{
return dlopen(name, RTLD_GLOBAL | RTLD_NOW);
}
/*
* xmlModulePlatformClose:
* @handle: handle to the module
*
* returns 0 on success, and non-zero on error.
*/
static int
xmlModulePlatformClose(void *handle)
{
return dlclose(handle);
}
/*
* xmlModulePlatformSymbol:
* http://www.opengroup.org/onlinepubs/009695399/functions/dlsym.html
* returns 0 on success and the loaded symbol in result, and -1 on error.
*/
static int
xmlModulePlatformSymbol(void *handle, const char *name, void **symbol)
{
*symbol = dlsym(handle, name);
if (dlerror() != NULL) {
return -1;
}
return 0;
}
#else /* ! HAVE_DLOPEN */
#ifdef HAVE_SHLLOAD /* HAVE_SHLLOAD */
#ifdef HAVE_DL_H
#include <dl.h>
#endif
/*
* xmlModulePlatformOpen:
* returns a handle on success, and zero on error.
*/
static void *
xmlModulePlatformOpen(const char *name)
{
return shl_load(name, BIND_IMMEDIATE, 0L);
}
/*
* xmlModulePlatformClose:
* returns 0 on success, and non-zero on error.
*/
static int
xmlModulePlatformClose(void *handle)
{
return shl_unload(handle);
}
/*
* xmlModulePlatformSymbol:
* http://docs.hp.com/en/B2355-90683/shl_load.3X.html
* returns 0 on success and the loaded symbol in result, and -1 on error.
*/
static int
xmlModulePlatformSymbol(void *handle, const char *name, void **symbol)
{
int rc;
errno = 0;
rc = shl_findsym(&handle, name, TYPE_UNDEFINED, symbol);
return rc;
}
#endif /* HAVE_SHLLOAD */
#endif /* ! HAVE_DLOPEN */
#ifdef _WIN32
#include <windows.h>
/*
* xmlModulePlatformOpen:
* returns a handle on success, and zero on error.
*/
static void *
xmlModulePlatformOpen(const char *name)
{
return LoadLibrary(name);
}
/*
* xmlModulePlatformClose:
* returns 0 on success, and non-zero on error.
*/
static int
xmlModulePlatformClose(void *handle)
{
int rc;
rc = FreeLibrary(handle);
return (0 == rc);
}
/*
* xmlModulePlatformSymbol:
* http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dllproc/base/getprocaddress.asp
* returns 0 on success and the loaded symbol in result, and -1 on error.
*/
static int
xmlModulePlatformSymbol(void *handle, const char *name, void **symbol)
{
*symbol = GetProcAddress(handle, name);
return (NULL == *symbol) ? -1 : 0;
}
#endif /* _WIN32 */
#ifdef HAVE_BEOS
#include <kernel/image.h>
/*
* xmlModulePlatformOpen:
* beos api info: http://www.beunited.org/bebook/The%20Kernel%20Kit/Images.html
* returns a handle on success, and zero on error.
*/
static void *
xmlModulePlatformOpen(const char *name)
{
return (void *) load_add_on(name);
}
/*
* xmlModulePlatformClose:
* beos api info: http://www.beunited.org/bebook/The%20Kernel%20Kit/Images.html
* returns 0 on success, and non-zero on error.
*/
static int
xmlModulePlatformClose(void *handle)
{
status_t rc;
rc = unload_add_on((image_id) handle);
if (rc == B_OK)
return 0;
else
return -1;
}
/*
* xmlModulePlatformSymbol:
* beos api info: http://www.beunited.org/bebook/The%20Kernel%20Kit/Images.html
* returns 0 on success and the loaded symbol in result, and -1 on error.
*/
static int
xmlModulePlatformSymbol(void *handle, const char *name, void **symbol)
{
status_t rc;
rc = get_image_symbol((image_id) handle, name, B_SYMBOL_TYPE_ANY, symbol);
return (rc == B_OK) ? 0 : -1;
}
#endif /* HAVE_BEOS */
#ifdef HAVE_OS2
#include <os2.h>
/*
* xmlModulePlatformOpen:
* os2 api info: http://www.edm2.com/os2api/Dos/DosLoadModule.html
* returns a handle on success, and zero on error.
*/
static void *
xmlModulePlatformOpen(const char *name)
{
char errbuf[256];
void *handle;
int rc;
rc = DosLoadModule(errbuf, sizeof(errbuf) - 1, name, &handle);
if (rc)
return 0;
else
return (handle);
}
/*
* xmlModulePlatformClose:
* os2 api info: http://www.edm2.com/os2api/Dos/DosFreeModule.html
* returns 0 on success, and non-zero on error.
*/
static int
xmlModulePlatformClose(void *handle)
{
return DosFreeModule(handle);
}
/*
* xmlModulePlatformSymbol:
* os2 api info: http://www.edm2.com/os2api/Dos/DosQueryProcAddr.html
* returns 0 on success and the loaded symbol in result, and -1 on error.
*/
static int
xmlModulePlatformSymbol(void *handle, const char *name, void **symbol)
{
int rc;
rc = DosQueryProcAddr(handle, 0, name, symbol);
return (rc == NO_ERROR) ? 0 : -1;
}
#endif /* HAVE_OS2 */
#define bottom_xmlmodule
#include "elfgcchack.h"
#endif /* LIBXML_MODULES_ENABLED */
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