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-rw-r--r--buckets/apr_buckets_mmap.c144
1 files changed, 144 insertions, 0 deletions
diff --git a/buckets/apr_buckets_mmap.c b/buckets/apr_buckets_mmap.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 "apr_buckets.h"
+
+#if APR_HAS_MMAP
+
+static apr_status_t mmap_bucket_read(apr_bucket *b, const char **str,
+ apr_size_t *length, apr_read_type_e block)
+{
+ apr_bucket_mmap *m = b->data;
+ apr_status_t ok;
+ void *addr;
+
+ if (!m->mmap) {
+ /* the apr_mmap_t was already cleaned up out from under us */
+ return APR_EINVAL;
+ }
+
+ ok = apr_mmap_offset(&addr, m->mmap, b->start);
+ if (ok != APR_SUCCESS) {
+ return ok;
+ }
+ *str = addr;
+ *length = b->length;
+ return APR_SUCCESS;
+}
+
+static apr_status_t mmap_bucket_cleanup(void *data)
+{
+ /* the apr_mmap_t is about to disappear out from under us, so we
+ * have no choice but to pretend it doesn't exist anymore. the
+ * refcount is now useless because there's nothing to refer to
+ * anymore. so the only valid action on any remaining referrer
+ * is to delete it. no more reads, no more anything. */
+ apr_bucket_mmap *m = data;
+
+ m->mmap = NULL;
+ return APR_SUCCESS;
+}
+
+static void mmap_bucket_destroy(void *data)
+{
+ apr_bucket_mmap *m = data;
+
+ if (apr_bucket_shared_destroy(m)) {
+ if (m->mmap) {
+ apr_pool_cleanup_kill(m->mmap->cntxt, m, mmap_bucket_cleanup);
+ apr_mmap_delete(m->mmap);
+ }
+ apr_bucket_free(m);
+ }
+}
+
+/*
+ * XXX: are the start and length arguments useful?
+ */
+APU_DECLARE(apr_bucket *) apr_bucket_mmap_make(apr_bucket *b, apr_mmap_t *mm,
+ apr_off_t start,
+ apr_size_t length)
+{
+ apr_bucket_mmap *m;
+
+ m = apr_bucket_alloc(sizeof(*m), b->list);
+ m->mmap = mm;
+
+ apr_pool_cleanup_register(mm->cntxt, m, mmap_bucket_cleanup,
+ apr_pool_cleanup_null);
+
+ b = apr_bucket_shared_make(b, m, start, length);
+ b->type = &apr_bucket_type_mmap;
+
+ return b;
+}
+
+
+APU_DECLARE(apr_bucket *) apr_bucket_mmap_create(apr_mmap_t *mm,
+ apr_off_t start,
+ apr_size_t length,
+ apr_bucket_alloc_t *list)
+{
+ apr_bucket *b = apr_bucket_alloc(sizeof(*b), list);
+
+ APR_BUCKET_INIT(b);
+ b->free = apr_bucket_free;
+ b->list = list;
+ return apr_bucket_mmap_make(b, mm, start, length);
+}
+
+static apr_status_t mmap_bucket_setaside(apr_bucket *b, apr_pool_t *p)
+{
+ apr_bucket_mmap *m = b->data;
+ apr_mmap_t *mm = m->mmap;
+ apr_mmap_t *new_mm;
+ apr_status_t ok;
+
+ if (!mm) {
+ /* the apr_mmap_t was already cleaned up out from under us */
+ return APR_EINVAL;
+ }
+
+ /* shortcut if possible */
+ if (apr_pool_is_ancestor(mm->cntxt, p)) {
+ return APR_SUCCESS;
+ }
+
+ /* duplicate apr_mmap_t into new pool */
+ ok = apr_mmap_dup(&new_mm, mm, p);
+ if (ok != APR_SUCCESS) {
+ return ok;
+ }
+
+ /* decrement refcount on old apr_bucket_mmap */
+ mmap_bucket_destroy(m);
+
+ /* create new apr_bucket_mmap pointing to new apr_mmap_t */
+ apr_bucket_mmap_make(b, new_mm, b->start, b->length);
+
+ return APR_SUCCESS;
+}
+
+APU_DECLARE_DATA const apr_bucket_type_t apr_bucket_type_mmap = {
+ "MMAP", 5, APR_BUCKET_DATA,
+ mmap_bucket_destroy,
+ mmap_bucket_read,
+ mmap_bucket_setaside,
+ apr_bucket_shared_split,
+ apr_bucket_shared_copy
+};
+
+#endif