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/* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <ctype.h>
#include <stdio.h>
#include "apu_config.h"
#include "apu.h"
#include "apr_pools.h"
#include "apr_tables.h"
#include "apr_dso.h"
#include "apr_strings.h"
#include "apr_hash.h"
#include "apr_file_io.h"
#include "apr_env.h"
#include "apr_atomic.h"
#include "apu_internal.h"
#include "apu_version.h"
#if APU_DSO_BUILD
#if APR_HAS_THREADS
static apr_thread_mutex_t* mutex = NULL;
#endif
static apr_hash_t *dsos = NULL;
static apr_uint32_t initialised = 0, in_init = 1;
#if APR_HAS_THREADS
apr_status_t apu_dso_mutex_lock()
{
return apr_thread_mutex_lock(mutex);
}
apr_status_t apu_dso_mutex_unlock()
{
return apr_thread_mutex_unlock(mutex);
}
#else
apr_status_t apu_dso_mutex_lock() {
return APR_SUCCESS;
}
apr_status_t apu_dso_mutex_unlock() {
return APR_SUCCESS;
}
#endif
static apr_status_t apu_dso_term(void *ptr)
{
/* set statics to NULL so init can work again */
dsos = NULL;
#if APR_HAS_THREADS
mutex = NULL;
#endif
/* Everything else we need is handled by cleanups registered
* when we created mutexes and loaded DSOs
*/
return APR_SUCCESS;
}
apr_status_t apu_dso_init(apr_pool_t *pool)
{
apr_status_t ret = APR_SUCCESS;
apr_pool_t *parent;
if (apr_atomic_inc32(&initialised)) {
apr_atomic_set32(&initialised, 1); /* prevent wrap-around */
while (apr_atomic_read32(&in_init)) /* wait until we get fully inited */
;
return APR_SUCCESS;
}
/* Top level pool scope, need process-scope lifetime */
for (parent = apr_pool_parent_get(pool);
parent && parent != pool;
parent = apr_pool_parent_get(pool))
pool = parent;
dsos = apr_hash_make(pool);
#if APR_HAS_THREADS
ret = apr_thread_mutex_create(&mutex, APR_THREAD_MUTEX_DEFAULT, pool);
/* This already registers a pool cleanup */
#endif
apr_pool_cleanup_register(pool, NULL, apu_dso_term,
apr_pool_cleanup_null);
apr_atomic_dec32(&in_init);
return ret;
}
apr_status_t apu_dso_load(apr_dso_handle_t **dlhandleptr,
apr_dso_handle_sym_t *dsoptr,
const char *module,
const char *modsym,
apr_pool_t *pool)
{
apr_dso_handle_t *dlhandle = NULL;
char *pathlist;
char path[APR_PATH_MAX + 1];
apr_array_header_t *paths;
apr_pool_t *global;
apr_status_t rv = APR_EDSOOPEN;
char *eos = NULL;
int i;
*dsoptr = apr_hash_get(dsos, module, APR_HASH_KEY_STRING);
if (*dsoptr) {
return APR_EINIT;
}
/* The driver DSO must have exactly the same lifetime as the
* drivers hash table; ignore the passed-in pool */
global = apr_hash_pool_get(dsos);
/* Retrieve our path search list or prepare for a single search */
if ((apr_env_get(&pathlist, APR_DSOPATH, pool) != APR_SUCCESS)
|| (apr_filepath_list_split(&paths, pathlist, pool) != APR_SUCCESS))
paths = apr_array_make(pool, 1, sizeof(char*));
#if defined(APU_DSO_LIBDIR)
/* Always search our prefix path, but on some platforms such as
* win32 this may be left undefined
*/
(*((char **)apr_array_push(paths))) = APU_DSO_LIBDIR;
#endif
for (i = 0; i < paths->nelts; ++i)
{
#if defined(WIN32)
/* Use win32 dso search semantics and attempt to
* load the relative lib on the first pass.
*/
if (!eos) {
eos = path;
--i;
}
else
#endif
{
eos = apr_cpystrn(path, ((char**)paths->elts)[i], sizeof(path));
if ((eos > path) && (eos - path < sizeof(path) - 1))
*(eos++) = '/';
}
apr_cpystrn(eos, module, sizeof(path) - (eos - path));
rv = apr_dso_load(&dlhandle, path, global);
if (dlhandleptr) {
*dlhandleptr = dlhandle;
}
if (rv == APR_SUCCESS) { /* APR_EDSOOPEN */
break;
}
#if defined(APU_DSO_LIBDIR)
else if (i < paths->nelts - 1) {
#else
else { /* No APU_DSO_LIBDIR to skip */
#endif
/* try with apr-util-APU_MAJOR_VERSION appended */
eos = apr_cpystrn(eos,
"apr-util-" APU_STRINGIFY(APU_MAJOR_VERSION) "/",
sizeof(path) - (eos - path));
apr_cpystrn(eos, module, sizeof(path) - (eos - path));
rv = apr_dso_load(&dlhandle, path, global);
if (dlhandleptr) {
*dlhandleptr = dlhandle;
}
if (rv == APR_SUCCESS) { /* APR_EDSOOPEN */
break;
}
}
}
if (rv != APR_SUCCESS) /* APR_ESYMNOTFOUND */
return rv;
rv = apr_dso_sym(dsoptr, dlhandle, modsym);
if (rv != APR_SUCCESS) { /* APR_ESYMNOTFOUND */
apr_dso_unload(dlhandle);
}
else {
module = apr_pstrdup(global, module);
apr_hash_set(dsos, module, APR_HASH_KEY_STRING, *dsoptr);
}
return rv;
}
#endif /* APU_DSO_BUILD */
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