6c648dd642
This is actually a fully functional build except: * All internal shared libraries are static linked to make sure there is no interference with ports (and to reduce build time). * It does not have the python/perl/etc plugin or API support. * By default, it installs as "svnlite" rather than "svn". * If WITH_SVN added in make.conf, you get "svn". * If WITHOUT_SVNLITE is in make.conf, this is completely disabled. To be absolutely clear, this is not intended for any use other than checking out freebsd source and committing, like we once did with cvs. It should be usable for small scale local repositories that don't need the python/perl plugin architecture.
147 lines
5.3 KiB
C
147 lines
5.3 KiB
C
/* 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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#ifndef APR_SHM_H
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#define APR_SHM_H
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/**
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* @file apr_shm.h
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* @brief APR Shared Memory Routines
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*/
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#include "apr.h"
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#include "apr_pools.h"
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#include "apr_errno.h"
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#ifdef __cplusplus
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extern "C" {
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#endif /* __cplusplus */
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/**
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* @defgroup apr_shm Shared Memory Routines
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* @ingroup APR
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* @{
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*/
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/**
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* Private, platform-specific data struture representing a shared memory
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* segment.
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*/
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typedef struct apr_shm_t apr_shm_t;
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/**
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* Create and make accessable a shared memory segment.
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* @param m The shared memory structure to create.
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* @param reqsize The desired size of the segment.
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* @param filename The file to use for shared memory on platforms that
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* require it.
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* @param pool the pool from which to allocate the shared memory
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* structure.
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* @remark A note about Anonymous vs. Named shared memory segments:
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* Not all plaforms support anonymous shared memory segments, but in
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* some cases it is prefered over other types of shared memory
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* implementations. Passing a NULL 'file' parameter to this function
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* will cause the subsystem to use anonymous shared memory segments.
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* If such a system is not available, APR_ENOTIMPL is returned.
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* @remark A note about allocation sizes:
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* On some platforms it is necessary to store some metainformation
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* about the segment within the actual segment. In order to supply
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* the caller with the requested size it may be necessary for the
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* implementation to request a slightly greater segment length
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* from the subsystem. In all cases, the apr_shm_baseaddr_get()
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* function will return the first usable byte of memory.
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*
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*/
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APR_DECLARE(apr_status_t) apr_shm_create(apr_shm_t **m,
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apr_size_t reqsize,
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const char *filename,
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apr_pool_t *pool);
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/**
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* Remove named resource associated with a shared memory segment,
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* preventing attachments to the resource, but not destroying it.
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* @param filename The filename associated with shared-memory segment which
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* needs to be removed
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* @param pool The pool used for file operations
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* @remark This function is only supported on platforms which support
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* name-based shared memory segments, and will return APR_ENOTIMPL on
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* platforms without such support. Removing the file while the shm
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* is in use is not entirely portable, caller may use this to enhance
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* obscurity of the resource, but be prepared for the the call to fail,
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* and for concurrent attempts to create a resource of the same name
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* to also fail. The pool cleanup of apr_shm_create (apr_shm_destroy)
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* also removes the named resource.
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*/
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APR_DECLARE(apr_status_t) apr_shm_remove(const char *filename,
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apr_pool_t *pool);
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/**
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* Destroy a shared memory segment and associated memory.
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* @param m The shared memory segment structure to destroy.
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*/
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APR_DECLARE(apr_status_t) apr_shm_destroy(apr_shm_t *m);
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/**
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* Attach to a shared memory segment that was created
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* by another process.
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* @param m The shared memory structure to create.
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* @param filename The file used to create the original segment.
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* (This MUST match the original filename.)
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* @param pool the pool from which to allocate the shared memory
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* structure for this process.
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*/
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APR_DECLARE(apr_status_t) apr_shm_attach(apr_shm_t **m,
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const char *filename,
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apr_pool_t *pool);
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/**
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* Detach from a shared memory segment without destroying it.
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* @param m The shared memory structure representing the segment
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* to detach from.
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*/
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APR_DECLARE(apr_status_t) apr_shm_detach(apr_shm_t *m);
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/**
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* Retrieve the base address of the shared memory segment.
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* NOTE: This address is only usable within the callers address
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* space, since this API does not guarantee that other attaching
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* processes will maintain the same address mapping.
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* @param m The shared memory segment from which to retrieve
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* the base address.
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* @return address, aligned by APR_ALIGN_DEFAULT.
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*/
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APR_DECLARE(void *) apr_shm_baseaddr_get(const apr_shm_t *m);
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/**
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* Retrieve the length of a shared memory segment in bytes.
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* @param m The shared memory segment from which to retrieve
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* the segment length.
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*/
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APR_DECLARE(apr_size_t) apr_shm_size_get(const apr_shm_t *m);
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/**
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* Get the pool used by this shared memory segment.
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*/
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APR_POOL_DECLARE_ACCESSOR(shm);
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/** @} */
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#ifdef __cplusplus
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}
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#endif
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#endif /* APR_SHM_T */
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