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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
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