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-rw-r--r--buckets/apr_buckets_pipe.c119
1 files changed, 119 insertions, 0 deletions
diff --git a/buckets/apr_buckets_pipe.c b/buckets/apr_buckets_pipe.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"
+
+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;
+}
+
+APU_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;
+}
+
+APU_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);
+}
+
+APU_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
+};