generated from sethub/template
[libxml2]Add libxml2 library
This commit is contained in:
zhoujiale
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/*
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* xmlmodule.c : basic API for dynamic module loading added 2.6.17
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*
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* See Copyright for the status of this software.
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*
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* Author: Joel W. Reed
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*
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* http://www.fortran-2000.com/ArnaudRecipes/sharedlib.html
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*/
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/* In order RTLD_GLOBAL and RTLD_NOW to be defined on zOS */
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#if defined(__MVS__)
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#define _UNIX03_SOURCE
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#endif
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#define IN_LIBXML
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#include "libxml.h"
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#include <string.h>
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#include <libxml/xmlmodule.h>
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#include <libxml/xmlmemory.h>
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#include <libxml/xmlerror.h>
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#include <libxml/xmlstring.h>
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#include "private/error.h"
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#ifdef LIBXML_MODULES_ENABLED
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struct _xmlModule {
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unsigned char *name;
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void *handle;
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};
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static void *xmlModulePlatformOpen(const char *name);
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static int xmlModulePlatformClose(void *handle);
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static int xmlModulePlatformSymbol(void *handle, const char *name, void **result);
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/************************************************************************
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* *
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* module memory error handler *
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* *
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************************************************************************/
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/**
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* Opens a module/shared library given its name or path
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*
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* @deprecated Will be removed.
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*
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* NOTE: that due to portability issues, behaviour can only be
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* guaranteed with `name` using ASCII. We cannot guarantee that
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* an UTF-8 string would work, which is why name is a const char *
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* and not a const xmlChar * .
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* TODO: options are not yet implemented.
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*
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* @param name the module name
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* @param options a set of xmlModuleOption
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* @returns a handle for the module or NULL in case of error
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*/
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xmlModule *
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xmlModuleOpen(const char *name, int options ATTRIBUTE_UNUSED)
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{
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xmlModulePtr module;
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module = (xmlModulePtr) xmlMalloc(sizeof(xmlModule));
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if (module == NULL)
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return (NULL);
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memset(module, 0, sizeof(xmlModule));
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module->handle = xmlModulePlatformOpen(name);
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if (module->handle == NULL) {
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xmlFree(module);
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return(NULL);
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}
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module->name = xmlStrdup((const xmlChar *) name);
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return (module);
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}
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/**
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* Lookup for a symbol address in the given module
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*
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* @deprecated Will be removed.
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*
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* NOTE: that due to portability issues, behaviour can only be
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* guaranteed with `name` using ASCII. We cannot guarantee that
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* an UTF-8 string would work, which is why name is a const char *
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* and not a const xmlChar * .
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*
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* @param module the module
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* @param name the name of the symbol
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* @param symbol the resulting symbol address
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* @returns 0 if the symbol was found, or -1 in case of error
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*/
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int
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xmlModuleSymbol(xmlModule *module, const char *name, void **symbol)
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{
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int rc = -1;
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if ((NULL == module) || (symbol == NULL) || (name == NULL))
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return rc;
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rc = xmlModulePlatformSymbol(module->handle, name, symbol);
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if (rc == -1)
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return rc;
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return rc;
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}
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/**
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* The close operations unload the associated module and free the
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* data associated to the module.
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*
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* @deprecated Will be removed.
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*
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* @param module the module handle
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* @returns 0 in case of success, -1 in case of argument error and -2
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* if the module could not be closed/unloaded.
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*/
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int
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xmlModuleClose(xmlModule *module)
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{
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int rc;
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if (NULL == module)
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return -1;
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rc = xmlModulePlatformClose(module->handle);
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if (rc != 0)
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return -2;
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rc = xmlModuleFree(module);
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return (rc);
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}
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/**
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* The free operations free the data associated to the module
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* but does not unload the associated shared library which may still
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* be in use.
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*
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* @deprecated Will be removed.
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*
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* @param module the module handle
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* @returns 0 in case of success, -1 in case of argument error
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*/
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int
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xmlModuleFree(xmlModule *module)
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{
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if (NULL == module)
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return -1;
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xmlFree(module->name);
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xmlFree(module);
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return (0);
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}
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#if defined(HAVE_DLOPEN) && !defined(_WIN32)
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#include <dlfcn.h>
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#ifndef RTLD_GLOBAL /* For Tru64 UNIX 4.0 */
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#define RTLD_GLOBAL 0
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#endif
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/**
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* @param name path to the module
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* @returns a handle on success, and zero on error.
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*/
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static void *
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xmlModulePlatformOpen(const char *name)
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{
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return dlopen(name, RTLD_GLOBAL | RTLD_NOW);
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}
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/*
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* @param handle handle to the module
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*
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* @returns 0 on success, and non-zero on error.
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*/
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static int
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xmlModulePlatformClose(void *handle)
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{
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return dlclose(handle);
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}
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/*
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* http://www.opengroup.org/onlinepubs/009695399/functions/dlsym.html
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*
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* @returns 0 on success and the loaded symbol in result, and -1 on error.
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*/
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static int
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xmlModulePlatformSymbol(void *handle, const char *name, void **symbol)
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{
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*symbol = dlsym(handle, name);
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if (dlerror() != NULL) {
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return -1;
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}
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return 0;
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}
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#else /* ! HAVE_DLOPEN */
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#ifdef HAVE_SHLLOAD /* HAVE_SHLLOAD */
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#include <dl.h>
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/*
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* @returns a handle on success, and zero on error.
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*/
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static void *
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xmlModulePlatformOpen(const char *name)
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{
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return shl_load(name, BIND_IMMEDIATE, 0L);
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}
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/*
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* @returns 0 on success, and non-zero on error.
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*/
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static int
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xmlModulePlatformClose(void *handle)
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{
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return shl_unload(handle);
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}
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/*
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* http://docs.hp.com/en/B2355-90683/shl_load.3X.html
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*
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* @returns 0 on success and the loaded symbol in result, and -1 on error.
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*/
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static int
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xmlModulePlatformSymbol(void *handle, const char *name, void **symbol)
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{
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int rc;
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errno = 0;
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rc = shl_findsym(&handle, name, TYPE_UNDEFINED, symbol);
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return rc;
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}
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#endif /* HAVE_SHLLOAD */
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#endif /* ! HAVE_DLOPEN */
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#if defined(_WIN32)
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#define WIN32_LEAN_AND_MEAN
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#include <windows.h>
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/*
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* @returns a handle on success, and zero on error.
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*/
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static void *
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xmlModulePlatformOpen(const char *name)
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{
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return LoadLibraryA(name);
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}
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/*
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* @returns 0 on success, and non-zero on error.
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*/
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static int
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xmlModulePlatformClose(void *handle)
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{
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int rc;
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rc = FreeLibrary(handle);
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return (0 == rc);
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}
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/*
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* http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dllproc/base/getprocaddress.asp
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*
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* @returns 0 on success and the loaded symbol in result, and -1 on error.
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*/
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static int
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xmlModulePlatformSymbol(void *handle, const char *name, void **symbol)
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{
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FARPROC proc = GetProcAddress(handle, name);
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memcpy(symbol, &proc, sizeof(proc));
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return (NULL == *symbol) ? -1 : 0;
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}
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#endif /* _WIN32 */
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#endif /* LIBXML_MODULES_ENABLED */
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