120 lines
4.1 KiB
C
120 lines
4.1 KiB
C
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/* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership.
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* The ASF licenses this file to You under the Apache License, Version 2.0
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* (the "License"); you may not use this file except in compliance with
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* the License. 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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static apr_status_t pipe_bucket_read(apr_bucket *a, const char **str,
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apr_size_t *len, apr_read_type_e block)
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{
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apr_file_t *p = a->data;
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char *buf;
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apr_status_t rv;
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apr_interval_time_t timeout;
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if (block == APR_NONBLOCK_READ) {
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apr_file_pipe_timeout_get(p, &timeout);
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apr_file_pipe_timeout_set(p, 0);
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}
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*str = NULL;
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*len = APR_BUCKET_BUFF_SIZE;
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buf = apr_bucket_alloc(*len, a->list); /* XXX: check for failure? */
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rv = apr_file_read(p, buf, len);
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if (block == APR_NONBLOCK_READ) {
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apr_file_pipe_timeout_set(p, timeout);
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}
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if (rv != APR_SUCCESS && rv != APR_EOF) {
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apr_bucket_free(buf);
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return rv;
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}
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/*
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* If there's more to read we have to keep the rest of the pipe
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* for later. Otherwise, we'll close the pipe.
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* XXX: Note that more complicated bucket types that
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* refer to data not in memory and must therefore have a read()
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* function similar to this one should be wary of copying this
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* code because if they have a destroy function they probably
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* want to migrate the bucket's subordinate structure from the
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* old bucket to a raw new one and adjust it as appropriate,
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* rather than destroying the old one and creating a completely
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* new bucket.
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*/
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if (*len > 0) {
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apr_bucket_heap *h;
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/* Change the current bucket to refer to what we read */
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a = apr_bucket_heap_make(a, buf, *len, apr_bucket_free);
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h = a->data;
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h->alloc_len = APR_BUCKET_BUFF_SIZE; /* note the real buffer size */
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*str = buf;
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APR_BUCKET_INSERT_AFTER(a, apr_bucket_pipe_create(p, a->list));
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}
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else {
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apr_bucket_free(buf);
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a = apr_bucket_immortal_make(a, "", 0);
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*str = a->data;
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if (rv == APR_EOF) {
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apr_file_close(p);
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}
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}
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return APR_SUCCESS;
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}
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APU_DECLARE(apr_bucket *) apr_bucket_pipe_make(apr_bucket *b, apr_file_t *p)
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{
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/*
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* A pipe is closed when the end is reached in pipe_bucket_read(). If
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* the pipe isn't read to the end (e.g., error path), the pipe will be
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* closed when its pool goes away.
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*
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* Note that typically the pipe is allocated from the request pool
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* so it will disappear when the request is finished. However the
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* core filter may decide to set aside the tail end of a CGI
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* response if the connection is pipelined. This turns out not to
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* be a problem because the core will have read to the end of the
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* stream so the bucket(s) that it sets aside will be the heap
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* buckets created by pipe_bucket_read() above.
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*/
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b->type = &apr_bucket_type_pipe;
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b->length = (apr_size_t)(-1);
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b->start = -1;
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b->data = p;
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return b;
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}
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APU_DECLARE(apr_bucket *) apr_bucket_pipe_create(apr_file_t *p,
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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_pipe_make(b, p);
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}
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APU_DECLARE_DATA const apr_bucket_type_t apr_bucket_type_pipe = {
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"PIPE", 5, APR_BUCKET_DATA,
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apr_bucket_destroy_noop,
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pipe_bucket_read,
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apr_bucket_setaside_notimpl,
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apr_bucket_split_notimpl,
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apr_bucket_copy_notimpl
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};
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