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Name	Size	Permission
apr-x86_64.h	17.89 KB	-rw-r--r--
apr.h	636 B	-rw-r--r--
apr_allocator.h	6.07 KB	-rw-r--r--
apr_anylock.h	4.93 KB	-rw-r--r--
apr_atomic.h	6.04 KB	-rw-r--r--
apr_base64.h	3.75 KB	-rw-r--r--
apr_buckets.h	63.15 KB	-rw-r--r--
apr_crypto.h	19.68 KB	-rw-r--r--
apr_cstr.h	11.13 KB	-rw-r--r--
apr_date.h	3.47 KB	-rw-r--r--
apr_dbd.h	23.35 KB	-rw-r--r--
apr_dbm.h	8.4 KB	-rw-r--r--
apr_dso.h	2.64 KB	-rw-r--r--
apr_encode.h	30.35 KB	-rw-r--r--
apr_env.h	2.06 KB	-rw-r--r--
apr_errno.h	53.77 KB	-rw-r--r--
apr_escape.h	17.23 KB	-rw-r--r--
apr_file_info.h	17.17 KB	-rw-r--r--
apr_file_io.h	42.88 KB	-rw-r--r--
apr_fnmatch.h	6.08 KB	-rw-r--r--
apr_general.h	7.34 KB	-rw-r--r--
apr_getopt.h	5.84 KB	-rw-r--r--
apr_global_mutex.h	7.19 KB	-rw-r--r--
apr_hash.h	10.08 KB	-rw-r--r--
apr_hooks.h	12.36 KB	-rw-r--r--
apr_inherit.h	2.09 KB	-rw-r--r--
apr_ldap.h	5.57 KB	-rw-r--r--
apr_ldap_init.h	5.64 KB	-rw-r--r--
apr_ldap_option.h	8.4 KB	-rw-r--r--
apr_ldap_rebind.h	3.09 KB	-rw-r--r--
apr_ldap_url.h	3.71 KB	-rw-r--r--
apr_lib.h	8.23 KB	-rw-r--r--
apr_md4.h	4.42 KB	-rw-r--r--
apr_md5.h	6.2 KB	-rw-r--r--
apr_memcache.h	16.82 KB	-rw-r--r--
apr_mmap.h	5.01 KB	-rw-r--r--
apr_network_io.h	36.02 KB	-rw-r--r--
apr_optional.h	2.71 KB	-rw-r--r--
apr_optional_hooks.h	3.78 KB	-rw-r--r--
apr_perms_set.h	1.86 KB	-rw-r--r--
apr_poll.h	20.6 KB	-rw-r--r--
apr_pools.h	30.94 KB	-rw-r--r--
apr_portable.h	20.02 KB	-rw-r--r--
apr_proc_mutex.h	6.85 KB	-rw-r--r--
apr_queue.h	3.98 KB	-rw-r--r--
apr_random.h	4.92 KB	-rw-r--r--
apr_redis.h	15.62 KB	-rw-r--r--
apr_reslist.h	7.01 KB	-rw-r--r--
apr_ring.h	18.78 KB	-rw-r--r--
apr_rmm.h	4.67 KB	-rw-r--r--
apr_sdbm.h	5.97 KB	-rw-r--r--
apr_sha1.h	3.79 KB	-rw-r--r--
apr_shm.h	9.26 KB	-rw-r--r--
apr_signal.h	2.7 KB	-rw-r--r--
apr_siphash.h	6.01 KB	-rw-r--r--
apr_skiplist.h	14.19 KB	-rw-r--r--
apr_strings.h	14.55 KB	-rw-r--r--
apr_strmatch.h	2.61 KB	-rw-r--r--
apr_support.h	1.6 KB	-rw-r--r--
apr_tables.h	18.9 KB	-rw-r--r--
apr_thread_cond.h	5.4 KB	-rw-r--r--
apr_thread_mutex.h	4.39 KB	-rw-r--r--
apr_thread_pool.h	10.84 KB	-rw-r--r--
apr_thread_proc.h	36.8 KB	-rw-r--r--
apr_thread_rwlock.h	4.65 KB	-rw-r--r--
apr_time.h	7.39 KB	-rw-r--r--
apr_uri.h	6.43 KB	-rw-r--r--
apr_user.h	5.19 KB	-rw-r--r--
apr_uuid.h	2.05 KB	-rw-r--r--
apr_version.h	5.22 KB	-rw-r--r--
apr_want.h	2.89 KB	-rw-r--r--
apr_xlate.h	6.26 KB	-rw-r--r--
apr_xml.h	12.19 KB	-rw-r--r--
apu.h	4.22 KB	-rw-r--r--
apu_errno.h	5.32 KB	-rw-r--r--
apu_version.h	4.2 KB	-rw-r--r--
apu_want.h	1.45 KB	-rw-r--r--

Code Editor : apr_shm.h

/* 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.
 */

#ifndef APR_SHM_H
#define APR_SHM_H

/**
 * @file apr_shm.h
 * @brief APR Shared Memory Routines
 */

#include "apr.h"
#include "apr_pools.h"
#include "apr_errno.h"
#include "apr_perms_set.h"

#ifdef __cplusplus
extern "C" {
#endif /* __cplusplus */

/**
 * @defgroup apr_shm Shared Memory Routines
 * @ingroup APR 
 * @{
 */

/**
 * Private, platform-specific data struture representing a shared memory
 * segment.
 */
typedef struct apr_shm_t apr_shm_t;

/**
 * Create and make accessible a shared memory segment with default
 * properties.
 * @param m The shared memory structure to create.
 * @param reqsize The desired size of the segment.
 * @param filename The file to use for shared memory on platforms that
 *        require it.
 * @param pool the pool from which to allocate the shared memory
 *        structure.
 * @remark A note about Anonymous vs. Named shared memory segments:
 *         Not all plaforms support anonymous shared memory segments, but in
 *         some cases it is prefered over other types of shared memory
 *         implementations. Passing a NULL 'file' parameter to this function
 *         will cause the subsystem to use anonymous shared memory segments.
 *         If such a system is not available, APR_ENOTIMPL is returned.
 * @remark A note about allocation sizes:
 *         On some platforms it is necessary to store some metainformation
 *         about the segment within the actual segment. In order to supply
 *         the caller with the requested size it may be necessary for the
 *         implementation to request a slightly greater segment length
 *         from the subsystem. In all cases, the apr_shm_baseaddr_get()
 *         function will return the first usable byte of memory.
 * 
 */
APR_DECLARE(apr_status_t) apr_shm_create(apr_shm_t **m,
                                         apr_size_t reqsize,
                                         const char *filename,
                                         apr_pool_t *pool);

/**
 * Special processing flags for apr_shm_create_ex() and apr_shm_attach_ex().
 */
#define APR_SHM_NS_LOCAL    1 /* Create or attach to named shared memory
                               * segment in the "Local" namespace on
                               * Windows.  (Ignored on other platforms.)
                               * By default, the "Global" namespace is
                               * used for privileged processes and the
                               * "Local" namespace is used otherwise.
                               */
#define APR_SHM_NS_GLOBAL   2 /* Create or attach to named shared memory
                               * segment in the "Global" namespace on
                               * Windows.  (Ignored on other platforms.)
                               */

/**
 * Create and make accessible a shared memory segment with platform-
 * specific processing.
 * @param m The shared memory structure to create.
 * @param reqsize The desired size of the segment.
 * @param filename The file to use for shared memory on platforms that
 *        require it.
 * @param pool the pool from which to allocate the shared memory
 *        structure.
 * @param flags mask of APR_SHM_* (defined above)
 * @remark A note about Anonymous vs. Named shared memory segments:
 *         Not all plaforms support anonymous shared memory segments, but in
 *         some cases it is prefered over other types of shared memory
 *         implementations. Passing a NULL 'file' parameter to this function
 *         will cause the subsystem to use anonymous shared memory segments.
 *         If such a system is not available, APR_ENOTIMPL is returned.
 * @remark A note about allocation sizes:
 *         On some platforms it is necessary to store some metainformation
 *         about the segment within the actual segment. In order to supply
 *         the caller with the requested size it may be necessary for the
 *         implementation to request a slightly greater segment length
 *         from the subsystem. In all cases, the apr_shm_baseaddr_get()
 *         function will return the first usable byte of memory.
 * 
 */
APR_DECLARE(apr_status_t) apr_shm_create_ex(apr_shm_t **m,
                                            apr_size_t reqsize,
                                            const char *filename,
                                            apr_pool_t *pool,
                                            apr_int32_t flags);

/**
 * Remove named resource associated with a shared memory segment,
 * preventing attachments to the resource, but not destroying it.
 * @param filename The filename associated with shared-memory segment which
 *        needs to be removed
 * @param pool The pool used for file operations
 * @remark This function is only supported on platforms which support
 * name-based shared memory segments, and will return APR_ENOTIMPL on
 * platforms without such support.  Removing the file while the shm
 * is in use is not entirely portable, caller may use this to enhance
 * obscurity of the resource, but be prepared for the call to fail,
 * and for concurrent attempts to create a resource of the same name
 * to also fail.  The pool cleanup of apr_shm_create (apr_shm_destroy)
 * also removes the named resource.
 */
APR_DECLARE(apr_status_t) apr_shm_remove(const char *filename,
                                         apr_pool_t *pool);

/**
 * Delete named resource associated with a shared memory segment,
 * preventing attachments to the resource.
 * @param m The shared memory segment structure to delete.
 * @remark This function is only supported on platforms which support
 * name-based shared memory segments, and will return APR_ENOTIMPL on
 * platforms without such support.  Removing the file while the shm
 * is in use is not entirely portable, caller may use this to enhance
 * obscurity of the resource, but be prepared for the call to fail,
 * and for concurrent attempts to create a resource of the same name
 * to also fail.  The pool cleanup of apr_shm_create (apr_shm_destroy)
 * also removes the named resource.
 */
APR_DECLARE(apr_status_t) apr_shm_delete(apr_shm_t *m);

/**
 * Destroy a shared memory segment and associated memory.
 * @param m The shared memory segment structure to destroy.
 */
APR_DECLARE(apr_status_t) apr_shm_destroy(apr_shm_t *m);

/**
 * Attach to a shared memory segment that was created
 * by another process.
 * @param m The shared memory structure to create.
 * @param filename The file used to create the original segment.
 *        (This MUST match the original filename.)
 * @param pool the pool from which to allocate the shared memory
 *        structure for this process.
 */
APR_DECLARE(apr_status_t) apr_shm_attach(apr_shm_t **m,
                                         const char *filename,
                                         apr_pool_t *pool);

/**
 * Attach to a shared memory segment that was created
 * by another process, with platform-specific processing.
 * @param m The shared memory structure to create.
 * @param filename The file used to create the original segment.
 *        (This MUST match the original filename.)
 * @param pool the pool from which to allocate the shared memory
 *        structure for this process.
 * @param flags mask of APR_SHM_* (defined above)
 */
APR_DECLARE(apr_status_t) apr_shm_attach_ex(apr_shm_t **m,
                                            const char *filename,
                                            apr_pool_t *pool,
                                            apr_int32_t flags);

/**
 * Detach from a shared memory segment without destroying it.
 * @param m The shared memory structure representing the segment
 *        to detach from.
 */
APR_DECLARE(apr_status_t) apr_shm_detach(apr_shm_t *m);

/**
 * Retrieve the base address of the shared memory segment.
 * NOTE: This address is only usable within the callers address
 * space, since this API does not guarantee that other attaching
 * processes will maintain the same address mapping.
 * @param m The shared memory segment from which to retrieve
 *        the base address.
 * @return address, aligned by APR_ALIGN_DEFAULT.
 */
APR_DECLARE(void *) apr_shm_baseaddr_get(const apr_shm_t *m);

/**
 * Retrieve the length of a shared memory segment in bytes.
 * @param m The shared memory segment from which to retrieve
 *        the segment length.
 */
APR_DECLARE(apr_size_t) apr_shm_size_get(const apr_shm_t *m);

/**
 * Set shared memory permissions.
 */
APR_PERMS_SET_IMPLEMENT(shm);

/**
 * Get the pool used by this shared memory segment.
 */
APR_POOL_DECLARE_ACCESSOR(shm);

/** @} */

#ifdef __cplusplus
}
#endif

#endif  /* APR_SHM_T */

${this.title}

Code Editor : apr_shm.h