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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.
*/
#ifndef APR_POOLS_H
#define APR_POOLS_H
/**
* @file apr_pools.h
* @brief APR memory allocation
*
* Resource allocation routines...
*
* designed so that we don't have to keep track of EVERYTHING so that
* it can be explicitly freed later (a fundamentally unsound strategy ---
* particularly in the presence of die()).
*
* Instead, we maintain pools, and allocate items (both memory and I/O
* handlers) from the pools --- currently there are two, one for
* per-transaction info, and one for config info. When a transaction is
* over, we can delete everything in the per-transaction apr_pool_t without
* fear, and without thinking too hard about it either.
*
* Note that most operations on pools are not thread-safe: a single pool
* should only be accessed by a single thread at any given time. The one
* exception to this rule is creating a subpool of a given pool: one or more
* threads can safely create subpools at the same time that another thread
* accesses the parent pool.
*/
#include "apr.h"
#include "apr_errno.h"
#include "apr_general.h" /* for APR_STRINGIFY */
#define APR_WANT_MEMFUNC /**< for no good reason? */
#include "apr_want.h"
#ifdef __cplusplus
extern "C" {
#endif
/**
* @defgroup apr_pools Memory Pool Functions
* @ingroup APR
* @{
*/
/** The fundamental pool type */
typedef struct apr_pool_t apr_pool_t;
/**
* Declaration helper macro to construct apr_foo_pool_get()s.
*
* This standardized macro is used by opaque (APR) data types to return
* the apr_pool_t that is associated with the data type.
*
* APR_POOL_DECLARE_ACCESSOR() is used in a header file to declare the
* accessor function. A typical usage and result would be:
* <pre>
* APR_POOL_DECLARE_ACCESSOR(file);
* becomes:
* APR_DECLARE(apr_pool_t *) apr_file_pool_get(const apr_file_t *thefile);
* </pre>
* @remark Doxygen unwraps this macro (via doxygen.conf) to provide
* actual help for each specific occurrence of apr_foo_pool_get.
* @remark the linkage is specified for APR. It would be possible to expand
* the macros to support other linkages.
*/
#define APR_POOL_DECLARE_ACCESSOR(type) \
APR_DECLARE(apr_pool_t *) apr_##type##_pool_get \
(const apr_##type##_t *the##type)
/**
* Implementation helper macro to provide apr_foo_pool_get()s.
*
* In the implementation, the APR_POOL_IMPLEMENT_ACCESSOR() is used to
* actually define the function. It assumes the field is named "pool".
*/
#define APR_POOL_IMPLEMENT_ACCESSOR(type) \
APR_DECLARE(apr_pool_t *) apr_##type##_pool_get \
(const apr_##type##_t *the##type) \
{ return the##type->pool; }
/**
* Pool debug levels
*
* <pre>
* | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
* ---------------------------------
* | | | | | | | | x | General debug code enabled (useful in
* combination with --with-efence).
*
* | | | | | | | x | | Verbose output on stderr (report
* CREATE, CLEAR, DESTROY).
*
* | | | | x | | | | | Verbose output on stderr (report
* PALLOC, PCALLOC).
*
* | | | | | | x | | | Lifetime checking. On each use of a
* pool, check its lifetime. If the pool
* is out of scope, abort().
* In combination with the verbose flag
* above, it will output LIFE in such an
* event prior to aborting.
*
* | | | | | x | | | | Pool owner checking. On each use of a
* pool, check if the current thread is the
* pool's owner. If not, abort(). In
* combination with the verbose flag above,
* it will output OWNER in such an event
* prior to aborting. Use the debug
* function apr_pool_owner_set() to switch
* a pool's ownership.
*
* When no debug level was specified, assume general debug mode.
* If level 0 was specified, debugging is switched off.
* </pre>
*/
#if defined(APR_POOL_DEBUG)
/* If APR_POOL_DEBUG is blank, we get 1; if it is a number, we get -1. */
#if (APR_POOL_DEBUG - APR_POOL_DEBUG -1 == 1)
#undef APR_POOL_DEBUG
#define APR_POOL_DEBUG 1
#endif
#else
#define APR_POOL_DEBUG 0
#endif
/** the place in the code where the particular function was called */
#define APR_POOL__FILE_LINE__ __FILE__ ":" APR_STRINGIFY(__LINE__)
/** A function that is called when allocation fails. */
typedef int (*apr_abortfunc_t)(int retcode);
/*
* APR memory structure manipulators (pools, tables, and arrays).
*/
/*
* Initialization
*/
/**
* Setup all of the internal structures required to use pools
* @remark Programs do NOT need to call this directly. APR will call this
* automatically from apr_initialize.
* @internal
*/
APR_DECLARE(apr_status_t) apr_pool_initialize(void);
/**
* Tear down all of the internal structures required to use pools
* @remark Programs do NOT need to call this directly. APR will call this
* automatically from apr_terminate.
* @internal
*/
APR_DECLARE(void) apr_pool_terminate(void);
/*
* Pool creation/destruction
*/
#include "apr_allocator.h"
/**
* Create a new pool.
* @param newpool The pool we have just created.
* @param parent The parent pool. If this is NULL, the new pool is a root
* pool. If it is non-NULL, the new pool will inherit all
* of its parent pool's attributes, except the apr_pool_t will
* be a sub-pool.
* @param abort_fn A function to use if the pool cannot allocate more memory.
* @param allocator The allocator to use with the new pool. If NULL the
* allocator of the parent pool will be used.
* @remark This function is thread-safe, in the sense that multiple threads
* can safely create subpools of the same parent pool concurrently.
* Similarly, a subpool can be created by one thread at the same
* time that another thread accesses the parent pool.
*/
APR_DECLARE(apr_status_t) apr_pool_create_ex(apr_pool_t **newpool,
apr_pool_t *parent,
apr_abortfunc_t abort_fn,
apr_allocator_t *allocator)
__attribute__((nonnull(1)));
/**
* Create a new pool.
* @deprecated @see apr_pool_create_unmanaged_ex.
*/
APR_DECLARE(apr_status_t) apr_pool_create_core_ex(apr_pool_t **newpool,
apr_abortfunc_t abort_fn,
apr_allocator_t *allocator);
/**
* Create a new unmanaged pool.
* @param newpool The pool we have just created.
* @param abort_fn A function to use if the pool cannot allocate more memory.
* @param allocator The allocator to use with the new pool. If NULL a
* new allocator will be created with the new pool as owner.
* @remark An unmanaged pool is a special pool without a parent; it will
* NOT be destroyed upon apr_terminate. It must be explicitly
* destroyed by calling apr_pool_destroy, to prevent memory leaks.
* Use of this function is discouraged, think twice about whether
* you really really need it.
* @warning Any child cleanups registered against the new pool, or
* against sub-pools thereof, will not be executed during an
* invocation of apr_proc_create(), so resources created in an
* "unmanaged" pool hierarchy will leak to child processes.
*/
APR_DECLARE(apr_status_t) apr_pool_create_unmanaged_ex(apr_pool_t **newpool,
apr_abortfunc_t abort_fn,
apr_allocator_t *allocator)
__attribute__((nonnull(1)));
/**
* Debug version of apr_pool_create_ex.
* @param newpool @see apr_pool_create.
* @param parent @see apr_pool_create.
* @param abort_fn @see apr_pool_create.
* @param allocator @see apr_pool_create.
* @param file_line Where the function is called from.
* This is usually APR_POOL__FILE_LINE__.
* @remark Only available when APR_POOL_DEBUG is defined.
* Call this directly if you have your apr_pool_create_ex
* calls in a wrapper function and wish to override
* the file_line argument to reflect the caller of
* your wrapper function. If you do not have
* apr_pool_create_ex in a wrapper, trust the macro
* and don't call apr_pool_create_ex_debug directly.
*/
APR_DECLARE(apr_status_t) apr_pool_create_ex_debug(apr_pool_t **newpool,
apr_pool_t *parent,
apr_abortfunc_t abort_fn,
apr_allocator_t *allocator,
const char *file_line)
__attribute__((nonnull(1)));
#if APR_POOL_DEBUG
#define apr_pool_create_ex(newpool, parent, abort_fn, allocator) \
apr_pool_create_ex_debug(newpool, parent, abort_fn, allocator, \
APR_POOL__FILE_LINE__)
#endif
/**
* Debug version of apr_pool_create_core_ex.
* @deprecated @see apr_pool_create_unmanaged_ex_debug.
*/
APR_DECLARE(apr_status_t) apr_pool_create_core_ex_debug(apr_pool_t **newpool,
apr_abortfunc_t abort_fn,
apr_allocator_t *allocator,
const char *file_line);
/**
* Debug version of apr_pool_create_unmanaged_ex.
* @param newpool @see apr_pool_create_unmanaged.
* @param abort_fn @see apr_pool_create_unmanaged.
* @param allocator @see apr_pool_create_unmanaged.
* @param file_line Where the function is called from.
* This is usually APR_POOL__FILE_LINE__.
* @remark Only available when APR_POOL_DEBUG is defined.
* Call this directly if you have your apr_pool_create_unmanaged_ex
* calls in a wrapper function and wish to override
* the file_line argument to reflect the caller of
* your wrapper function. If you do not have
* apr_pool_create_core_ex in a wrapper, trust the macro
* and don't call apr_pool_create_core_ex_debug directly.
*/
APR_DECLARE(apr_status_t) apr_pool_create_unmanaged_ex_debug(apr_pool_t **newpool,
apr_abortfunc_t abort_fn,
apr_allocator_t *allocator,
const char *file_line)
__attribute__((nonnull(1)));
#if APR_POOL_DEBUG
#define apr_pool_create_core_ex(newpool, abort_fn, allocator) \
apr_pool_create_unmanaged_ex_debug(newpool, abort_fn, allocator, \
APR_POOL__FILE_LINE__)
#define apr_pool_create_unmanaged_ex(newpool, abort_fn, allocator) \
apr_pool_create_unmanaged_ex_debug(newpool, abort_fn, allocator, \
APR_POOL__FILE_LINE__)
#endif
/**
* Create a new pool.
* @param newpool The pool we have just created.
* @param parent The parent pool. If this is NULL, the new pool is a root
* pool. If it is non-NULL, the new pool will inherit all
* of its parent pool's attributes, except the apr_pool_t will
* be a sub-pool.
* @remark This function is thread-safe, in the sense that multiple threads
* can safely create subpools of the same parent pool concurrently.
* Similarly, a subpool can be created by one thread at the same
* time that another thread accesses the parent pool.
*/
#if defined(DOXYGEN)
APR_DECLARE(apr_status_t) apr_pool_create(apr_pool_t **newpool,
apr_pool_t *parent);
#else
#if APR_POOL_DEBUG
#define apr_pool_create(newpool, parent) \
apr_pool_create_ex_debug(newpool, parent, NULL, NULL, \
APR_POOL__FILE_LINE__)
#else
#define apr_pool_create(newpool, parent) \
apr_pool_create_ex(newpool, parent, NULL, NULL)
#endif
#endif
/**
* Create a new unmanaged pool.
* @param newpool The pool we have just created.
*/
#if defined(DOXYGEN)
APR_DECLARE(apr_status_t) apr_pool_create_core(apr_pool_t **newpool);
APR_DECLARE(apr_status_t) apr_pool_create_unmanaged(apr_pool_t **newpool);
#else
#if APR_POOL_DEBUG
#define apr_pool_create_core(newpool) \
apr_pool_create_unmanaged_ex_debug(newpool, NULL, NULL, \
APR_POOL__FILE_LINE__)
#define apr_pool_create_unmanaged(newpool) \
apr_pool_create_unmanaged_ex_debug(newpool, NULL, NULL, \
APR_POOL__FILE_LINE__)
#else
#define apr_pool_create_core(newpool) \
apr_pool_create_unmanaged_ex(newpool, NULL, NULL)
#define apr_pool_create_unmanaged(newpool) \
apr_pool_create_unmanaged_ex(newpool, NULL, NULL)
#endif
#endif
/**
* Find the pool's allocator
* @param pool The pool to get the allocator from.
*/
APR_DECLARE(apr_allocator_t *) apr_pool_allocator_get(apr_pool_t *pool)
__attribute__((nonnull(1)));
/**
* Clear all memory in the pool and run all the cleanups. This also destroys all
* subpools.
* @param p The pool to clear
* @remark This does not actually free the memory, it just allows the pool
* to re-use this memory for the next allocation.
* @see apr_pool_destroy()
*/
APR_DECLARE(void) apr_pool_clear(apr_pool_t *p) __attribute__((nonnull(1)));
/**
* Debug version of apr_pool_clear.
* @param p See: apr_pool_clear.
* @param file_line Where the function is called from.
* This is usually APR_POOL__FILE_LINE__.
* @remark Only available when APR_POOL_DEBUG is defined.
* Call this directly if you have your apr_pool_clear
* calls in a wrapper function and wish to override
* the file_line argument to reflect the caller of
* your wrapper function. If you do not have
* apr_pool_clear in a wrapper, trust the macro
* and don't call apr_pool_destroy_clear directly.
*/
APR_DECLARE(void) apr_pool_clear_debug(apr_pool_t *p,
const char *file_line)
__attribute__((nonnull(1)));
#if APR_POOL_DEBUG
#define apr_pool_clear(p) \
apr_pool_clear_debug(p, APR_POOL__FILE_LINE__)
#endif
/**
* Destroy the pool. This takes similar action as apr_pool_clear() and then
* frees all the memory.
* @param p The pool to destroy
* @remark This will actually free the memory
*/
APR_DECLARE(void) apr_pool_destroy(apr_pool_t *p) __attribute__((nonnull(1)));
/**
* Debug version of apr_pool_destroy.
* @param p See: apr_pool_destroy.
* @param file_line Where the function is called from.
* This is usually APR_POOL__FILE_LINE__.
* @remark Only available when APR_POOL_DEBUG is defined.
* Call this directly if you have your apr_pool_destroy
* calls in a wrapper function and wish to override
* the file_line argument to reflect the caller of
* your wrapper function. If you do not have
* apr_pool_destroy in a wrapper, trust the macro
* and don't call apr_pool_destroy_debug directly.
*/
APR_DECLARE(void) apr_pool_destroy_debug(apr_pool_t *p,
const char *file_line)
__attribute__((nonnull(1)));
#if APR_POOL_DEBUG
#define apr_pool_destroy(p) \
apr_pool_destroy_debug(p, APR_POOL__FILE_LINE__)
#endif
/*
* Memory allocation
*/
/**
* Allocate a block of memory from a pool
* @param p The pool to allocate from
* @param size The amount of memory to allocate
* @return The allocated memory
*/
APR_DECLARE(void *) apr_palloc(apr_pool_t *p, apr_size_t size)
#if defined(__GNUC__) && (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 4))
__attribute__((alloc_size(2)))
#endif
__attribute__((nonnull(1)));
/**
* Debug version of apr_palloc
* @param p See: apr_palloc
* @param size See: apr_palloc
* @param file_line Where the function is called from.
* This is usually APR_POOL__FILE_LINE__.
* @return See: apr_palloc
*/
APR_DECLARE(void *) apr_palloc_debug(apr_pool_t *p, apr_size_t size,
const char *file_line)
#if defined(__GNUC__) && (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 4))
__attribute__((alloc_size(2)))
#endif
__attribute__((nonnull(1)));
#if APR_POOL_DEBUG
#define apr_palloc(p, size) \
apr_palloc_debug(p, size, APR_POOL__FILE_LINE__)
#endif
/**
* Allocate a block of memory from a pool and set all of the memory to 0
* @param p The pool to allocate from
* @param size The amount of memory to allocate
* @return The allocated memory
*/
#if defined(DOXYGEN)
APR_DECLARE(void *) apr_pcalloc(apr_pool_t *p, apr_size_t size);
#elif !APR_POOL_DEBUG
#define apr_pcalloc(p, size) memset(apr_palloc(p, size), 0, size)
#endif
/**
* Debug version of apr_pcalloc
* @param p See: apr_pcalloc
* @param size See: apr_pcalloc
* @param file_line Where the function is called from.
* This is usually APR_POOL__FILE_LINE__.
* @return See: apr_pcalloc
*/
APR_DECLARE(void *) apr_pcalloc_debug(apr_pool_t *p, apr_size_t size,
const char *file_line)
__attribute__((nonnull(1)));
#if APR_POOL_DEBUG
#define apr_pcalloc(p, size) \
apr_pcalloc_debug(p, size, APR_POOL__FILE_LINE__)
#endif
/*
* Pool Properties
*/
/**
* Set the function to be called when an allocation failure occurs.
* @remark If the program wants APR to exit on a memory allocation error,
* then this function can be called to set the callback to use (for
* performing cleanup and then exiting). If this function is not called,
* then APR will return an error and expect the calling program to
* deal with the error accordingly.
*/
APR_DECLARE(void) apr_pool_abort_set(apr_abortfunc_t abortfunc,
apr_pool_t *pool)
__attribute__((nonnull(2)));
/**
* Get the abort function associated with the specified pool.
* @param pool The pool for retrieving the abort function.
* @return The abort function for the given pool.
*/
APR_DECLARE(apr_abortfunc_t) apr_pool_abort_get(apr_pool_t *pool)
__attribute__((nonnull(1)));
/**
* Get the parent pool of the specified pool.
* @param pool The pool for retrieving the parent pool.
* @return The parent of the given pool.
*/
APR_DECLARE(apr_pool_t *) apr_pool_parent_get(apr_pool_t *pool)
__attribute__((nonnull(1)));
/**
* Determine if pool a is an ancestor of pool b.
* @param a The pool to search
* @param b The pool to search for
* @return True if a is an ancestor of b, NULL is considered an ancestor
* of all pools.
* @remark if compiled with APR_POOL_DEBUG, this function will also
* return true if A is a pool which has been guaranteed by the caller
* (using apr_pool_join) to have a lifetime at least as long as some
* ancestor of pool B.
*/
APR_DECLARE(int) apr_pool_is_ancestor(apr_pool_t *a, apr_pool_t *b);
/**
* Tag a pool (give it a name)
* @param pool The pool to tag
* @param tag The tag
*/
APR_DECLARE(void) apr_pool_tag(apr_pool_t *pool, const char *tag)
__attribute__((nonnull(1)));
/*
* User data management
*/
/**
* Set the data associated with the current pool
* @param data The user data associated with the pool.
* @param key The key to use for association
* @param cleanup The cleanup program to use to cleanup the data (NULL if none)
* @param pool The current pool
* @warning The data to be attached to the pool should have a life span
* at least as long as the pool it is being attached to.
*
* Users of APR must take EXTREME care when choosing a key to
* use for their data. It is possible to accidentally overwrite
* data by choosing a key that another part of the program is using.
* Therefore it is advised that steps are taken to ensure that unique
* keys are used for all of the userdata objects in a particular pool
* (the same key in two different pools or a pool and one of its
* subpools is okay) at all times. Careful namespace prefixing of
* key names is a typical way to help ensure this uniqueness.
*
*/
APR_DECLARE(apr_status_t) apr_pool_userdata_set(const void *data,
const char *key,
apr_status_t (*cleanup)(void *),
apr_pool_t *pool)
__attribute__((nonnull(2,4)));
/**
* Set the data associated with the current pool
* @param data The user data associated with the pool.
* @param key The key to use for association
* @param cleanup The cleanup program to use to cleanup the data (NULL if none)
* @param pool The current pool
* @note same as apr_pool_userdata_set(), except that this version doesn't
* make a copy of the key (this function is useful, for example, when
* the key is a string literal)
* @warning This should NOT be used if the key could change addresses by
* any means between the apr_pool_userdata_setn() call and a
* subsequent apr_pool_userdata_get() on that key, such as if a
* static string is used as a userdata key in a DSO and the DSO could
* be unloaded and reloaded between the _setn() and the _get(). You
* MUST use apr_pool_userdata_set() in such cases.
* @warning More generally, the key and the data to be attached to the
* pool should have a life span at least as long as the pool itself.
*
*/
APR_DECLARE(apr_status_t) apr_pool_userdata_setn(
const void *data, const char *key,
apr_status_t (*cleanup)(void *),
apr_pool_t *pool)
__attribute__((nonnull(2,4)));
/**
* Return the data associated with the current pool.
* @param data The user data associated with the pool.
* @param key The key for the data to retrieve
* @param pool The current pool.
*/
APR_DECLARE(apr_status_t) apr_pool_userdata_get(void **data, const char *key,
apr_pool_t *pool)
__attribute__((nonnull(1,2,3)));
/**
* @defgroup PoolCleanup Pool Cleanup Functions
*
* Cleanups are performed in the reverse order they were registered. That is:
* Last In, First Out. A cleanup function can safely allocate memory from
* the pool that is being cleaned up. It can also safely register additional
* cleanups which will be run LIFO, directly after the current cleanup
* terminates. Cleanups have to take caution in calling functions that
* create subpools. Subpools, created during cleanup will NOT automatically
* be cleaned up. In other words, cleanups are to clean up after themselves.
*
* @{
*/
/**
* Register a function to be called when a pool is cleared or destroyed
* @param p The pool to register the cleanup with
* @param data The data to pass to the cleanup function.
* @param plain_cleanup The function to call when the pool is cleared
* or destroyed
* @param child_cleanup The function to call when a child process is about
* to exec - this function is called in the child, obviously!
*/
APR_DECLARE(void) apr_pool_cleanup_register(
apr_pool_t *p, const void *data,
apr_status_t (*plain_cleanup)(void *),
apr_status_t (*child_cleanup)(void *))
__attribute__((nonnull(3,4)));
/**
* Register a function to be called when a pool is cleared or destroyed.
*
* Unlike apr_pool_cleanup_register which registers a cleanup
* that is called AFTER all subpools are destroyed, this function registers
* a function that will be called before any of the subpools are destroyed.
*
* @param p The pool to register the cleanup with
* @param data The data to pass to the cleanup function.
* @param plain_cleanup The function to call when the pool is cleared
* or destroyed
*/
APR_DECLARE(void) apr_pool_pre_cleanup_register(
apr_pool_t *p, const void *data,
apr_status_t (*plain_cleanup)(void *))
__attribute__((nonnull(3)));
/**
* Remove a previously registered cleanup function.
*
* The cleanup most recently registered with @a p having the same values of
* @a data and @a cleanup will be removed.
*
* @param p The pool to remove the cleanup from
* @param data The data of the registered cleanup
* @param cleanup The function to remove from cleanup
* @remarks For some strange reason only the plain_cleanup is handled by this
* function
*/
APR_DECLARE(void) apr_pool_cleanup_kill(apr_pool_t *p, const void *data,
apr_status_t (*cleanup)(void *))
__attribute__((nonnull(3)));
/**
* Replace the child cleanup function of a previously registered cleanup.
*
* The cleanup most recently registered with @a p having the same values of
* @a data and @a plain_cleanup will have the registered child cleanup
* function replaced with @a child_cleanup.
*
* @param p The pool of the registered cleanup
* @param data The data of the registered cleanup
* @param plain_cleanup The plain cleanup function of the registered cleanup
* @param child_cleanup The function to register as the child cleanup
*/
APR_DECLARE(void) apr_pool_child_cleanup_set(
apr_pool_t *p, const void *data,
apr_status_t (*plain_cleanup)(void *),
apr_status_t (*child_cleanup)(void *))
__attribute__((nonnull(3,4)));
/**
* Run the specified cleanup function immediately and unregister it.
*
* The cleanup most recently registered with @a p having the same values of
* @a data and @a cleanup will be removed and @a cleanup will be called
* with @a data as the argument.
*
* @param p The pool to remove the cleanup from
* @param data The data to remove from cleanup
* @param cleanup The function to remove from cleanup
*/
APR_DECLARE(apr_status_t) apr_pool_cleanup_run(apr_pool_t *p, void *data,
apr_status_t (*cleanup)(void *))
__attribute__((nonnull(3)));
/**
* An empty cleanup function.
*
* Passed to apr_pool_cleanup_register() when no cleanup is required.
*
* @param data The data to cleanup, will not be used by this function.
*/
APR_DECLARE_NONSTD(apr_status_t) apr_pool_cleanup_null(void *data);
/**
* Run all registered child cleanups, in preparation for an exec()
* call in a forked child -- close files, etc., but *don't* flush I/O
* buffers, *don't* wait for subprocesses, and *don't* free any
* memory.
*/
APR_DECLARE(void) apr_pool_cleanup_for_exec(void);
/** @} */
/**
* @defgroup PoolDebug Pool Debugging functions.
*
* pools have nested lifetimes -- sub_pools are destroyed when the
* parent pool is cleared. We allow certain liberties with operations
* on things such as tables (and on other structures in a more general
* sense) where we allow the caller to insert values into a table which
* were not allocated from the table's pool. The table's data will
* remain valid as long as all the pools from which its values are
* allocated remain valid.
*
* For example, if B is a sub pool of A, and you build a table T in
* pool B, then it's safe to insert data allocated in A or B into T
* (because B lives at most as long as A does, and T is destroyed when
* B is cleared/destroyed). On the other hand, if S is a table in
* pool A, it is safe to insert data allocated in A into S, but it
* is *not safe* to insert data allocated from B into S... because
* B can be cleared/destroyed before A is (which would leave dangling
* pointers in T's data structures).
*
* In general we say that it is safe to insert data into a table T
* if the data is allocated in any ancestor of T's pool. This is the
* basis on which the APR_POOL_DEBUG code works -- it tests these ancestor
* relationships for all data inserted into tables. APR_POOL_DEBUG also
* provides tools (apr_pool_find, and apr_pool_is_ancestor) for other
* folks to implement similar restrictions for their own data
* structures.
*
* However, sometimes this ancestor requirement is inconvenient --
* sometimes it's necessary to create a sub pool where the sub pool is
* guaranteed to have the same lifetime as the parent pool. This is a
* guarantee implemented by the *caller*, not by the pool code. That
* is, the caller guarantees they won't destroy the sub pool
* individually prior to destroying the parent pool.
*
* In this case the caller must call apr_pool_join() to indicate this
* guarantee to the APR_POOL_DEBUG code.
*
* These functions are only implemented when #APR_POOL_DEBUG is set.
*
* @{
*/
#if APR_POOL_DEBUG || defined(DOXYGEN)
/**
* Guarantee that a subpool has the same lifetime as the parent.
* @param p The parent pool
* @param sub The subpool
*/
APR_DECLARE(void) apr_pool_join(apr_pool_t *p, apr_pool_t *sub)
__attribute__((nonnull(2)));
/**
* Find a pool from something allocated in it.
* @param mem The thing allocated in the pool
* @return The pool it is allocated in
*/
APR_DECLARE(apr_pool_t *) apr_pool_find(const void *mem);
/**
* Report the number of bytes currently in the pool
* @param p The pool to inspect
* @param recurse Recurse/include the subpools' sizes
* @return The number of bytes
*/
APR_DECLARE(apr_size_t) apr_pool_num_bytes(apr_pool_t *p, int recurse)
__attribute__((nonnull(1)));
/**
* Lock a pool
* @param pool The pool to lock
* @param flag The flag
*/
APR_DECLARE(void) apr_pool_lock(apr_pool_t *pool, int flag);
/* @} */
#else /* APR_POOL_DEBUG or DOXYGEN */
#ifdef apr_pool_join
#undef apr_pool_join
#endif
#define apr_pool_join(a,b)
#ifdef apr_pool_lock
#undef apr_pool_lock
#endif
#define apr_pool_lock(pool, lock)
#endif /* APR_POOL_DEBUG or DOXYGEN */
/** @} */
#ifdef __cplusplus
}
#endif
#endif /* !APR_POOLS_H */
| N4m3 |
5!z3 |
L45t M0d!f!3d |
0wn3r / Gr0up |
P3Rm!55!0n5 |
0pt!0n5 |
| .. |
-- |
October 07 2021 18:50:07 |
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| apr.h |
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| apr_allocator.h |
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| apr_anylock.h |
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| apr_atomic.h |
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| apr_base64.h |
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| apr_buckets.h |
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| apr_crypto.h |
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| apr_cstr.h |
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| apr_date.h |
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| apr_dbd.h |
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| apr_dbm.h |
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| apr_dso.h |
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| apr_encode.h |
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| apr_env.h |
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| apr_errno.h |
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| apr_escape.h |
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| apr_file_info.h |
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| apr_file_io.h |
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| apr_fnmatch.h |
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| apr_general.h |
7.123 KB |
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| apr_getopt.h |
5.84 KB |
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| apr_global_mutex.h |
7.188 KB |
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| apr_hash.h |
10.084 KB |
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| apr_hooks.h |
12.363 KB |
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| apr_inherit.h |
2.089 KB |
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| apr_ldap.h |
5.57 KB |
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| apr_ldap_init.h |
5.645 KB |
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| apr_ldap_option.h |
8.402 KB |
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| apr_ldap_rebind.h |
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| apr_ldap_url.h |
3.71 KB |
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| apr_lib.h |
8.232 KB |
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| apr_md4.h |
4.419 KB |
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| apr_md5.h |
6.201 KB |
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| apr_memcache.h |
16.82 KB |
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| apr_mmap.h |
5.013 KB |
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| apr_network_io.h |
36.009 KB |
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| apr_optional.h |
2.715 KB |
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| apr_optional_hooks.h |
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| apr_perms_set.h |
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| apr_poll.h |
20.604 KB |
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| apr_pools.h |
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| apr_portable.h |
20.022 KB |
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| apr_proc_mutex.h |
6.848 KB |
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| apr_queue.h |
3.984 KB |
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| apr_random.h |
4.918 KB |
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| apr_redis.h |
15.62 KB |
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| apr_reslist.h |
7.008 KB |
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| apr_ring.h |
18.569 KB |
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| apr_rmm.h |
4.666 KB |
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| apr_sdbm.h |
5.97 KB |
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| apr_sha1.h |
3.793 KB |
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| apr_shm.h |
9.261 KB |
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| apr_signal.h |
2.696 KB |
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| apr_siphash.h |
6.014 KB |
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| apr_skiplist.h |
14.192 KB |
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| apr_strings.h |
14.548 KB |
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| apr_strmatch.h |
2.614 KB |
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| apr_support.h |
1.596 KB |
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| apr_tables.h |
18.899 KB |
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| apr_thread_cond.h |
5.396 KB |
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| apr_thread_mutex.h |
4.393 KB |
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| apr_thread_pool.h |
10.844 KB |
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| apr_thread_proc.h |
35.28 KB |
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| apr_thread_rwlock.h |
4.654 KB |
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| apr_time.h |
7.386 KB |
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| apr_uri.h |
6.435 KB |
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| apr_user.h |
5.186 KB |
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| apr_uuid.h |
2.053 KB |
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| apr_version.h |
5.284 KB |
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| apr_want.h |
2.889 KB |
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| apr_xlate.h |
6.258 KB |
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| apr_xml.h |
12.193 KB |
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| apu.h |
4.217 KB |
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| apu_errno.h |
5.316 KB |
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| apu_version.h |
4.198 KB |
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| apu_want.h |
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