forked from Mirrors/freeswitch
3b35430557
git-svn-id: http://svn.freeswitch.org/svn/freeswitch/trunk@3734 d0543943-73ff-0310-b7d9-9358b9ac24b2
145 lines
4.0 KiB
C
145 lines
4.0 KiB
C
/* Copyright 2000-2005 The Apache Software Foundation or its licensors, as
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* applicable.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "apr_buckets.h"
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#if APR_HAS_MMAP
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static apr_status_t mmap_bucket_read(apr_bucket *b, const char **str,
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apr_size_t *length, apr_read_type_e block)
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{
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apr_bucket_mmap *m = b->data;
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apr_status_t ok;
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void *addr;
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if (!m->mmap) {
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/* the apr_mmap_t was already cleaned up out from under us */
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return APR_EINVAL;
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}
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ok = apr_mmap_offset(&addr, m->mmap, b->start);
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if (ok != APR_SUCCESS) {
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return ok;
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}
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*str = addr;
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*length = b->length;
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return APR_SUCCESS;
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}
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static apr_status_t mmap_bucket_cleanup(void *data)
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{
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/* the apr_mmap_t is about to disappear out from under us, so we
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* have no choice but to pretend it doesn't exist anymore. the
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* refcount is now useless because there's nothing to refer to
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* anymore. so the only valid action on any remaining referrer
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* is to delete it. no more reads, no more anything. */
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apr_bucket_mmap *m = data;
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m->mmap = NULL;
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return APR_SUCCESS;
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}
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static void mmap_bucket_destroy(void *data)
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{
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apr_bucket_mmap *m = data;
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if (apr_bucket_shared_destroy(m)) {
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if (m->mmap) {
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apr_pool_cleanup_kill(m->mmap->cntxt, m, mmap_bucket_cleanup);
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apr_mmap_delete(m->mmap);
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}
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apr_bucket_free(m);
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}
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}
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/*
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* XXX: are the start and length arguments useful?
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*/
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APU_DECLARE(apr_bucket *) apr_bucket_mmap_make(apr_bucket *b, apr_mmap_t *mm,
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apr_off_t start,
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apr_size_t length)
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{
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apr_bucket_mmap *m;
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m = apr_bucket_alloc(sizeof(*m), b->list);
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m->mmap = mm;
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apr_pool_cleanup_register(mm->cntxt, m, mmap_bucket_cleanup,
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apr_pool_cleanup_null);
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b = apr_bucket_shared_make(b, m, start, length);
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b->type = &apr_bucket_type_mmap;
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return b;
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}
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APU_DECLARE(apr_bucket *) apr_bucket_mmap_create(apr_mmap_t *mm,
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apr_off_t start,
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apr_size_t length,
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apr_bucket_alloc_t *list)
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{
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apr_bucket *b = apr_bucket_alloc(sizeof(*b), list);
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APR_BUCKET_INIT(b);
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b->free = apr_bucket_free;
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b->list = list;
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return apr_bucket_mmap_make(b, mm, start, length);
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}
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static apr_status_t mmap_bucket_setaside(apr_bucket *b, apr_pool_t *p)
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{
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apr_bucket_mmap *m = b->data;
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apr_mmap_t *mm = m->mmap;
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apr_mmap_t *new_mm;
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apr_status_t ok;
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if (!mm) {
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/* the apr_mmap_t was already cleaned up out from under us */
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return APR_EINVAL;
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}
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/* shortcut if possible */
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if (apr_pool_is_ancestor(mm->cntxt, p)) {
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return APR_SUCCESS;
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}
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/* duplicate apr_mmap_t into new pool */
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ok = apr_mmap_dup(&new_mm, mm, p);
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if (ok != APR_SUCCESS) {
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return ok;
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}
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/* decrement refcount on old apr_bucket_mmap */
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mmap_bucket_destroy(m);
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/* create new apr_bucket_mmap pointing to new apr_mmap_t */
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apr_bucket_mmap_make(b, new_mm, b->start, b->length);
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return APR_SUCCESS;
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}
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APU_DECLARE_DATA const apr_bucket_type_t apr_bucket_type_mmap = {
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"MMAP", 5, APR_BUCKET_DATA,
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mmap_bucket_destroy,
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mmap_bucket_read,
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mmap_bucket_setaside,
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apr_bucket_shared_split,
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apr_bucket_shared_copy
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};
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#endif
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