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