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-rw-r--r--misc/apu_dso.c209
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diff --git a/misc/apu_dso.c b/misc/apu_dso.c
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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 */
+