apr---接口篇

怼烎@ 2021-11-04 14:36 175阅读 0赞

apr　:　Apache Portable Runtime

apr 接口详见： [http://apr.apache.org/docs/apr/2.0/group\_\_apr\_\_thread\_\_proc.html\#ga1426acc5bdd96385769e7b42bfa6ebbd][http_apr.apache.org_docs_apr_2.0_group_apr_thread_proc.html_ga1426acc5bdd96385769e7b42bfa6ebbd]

**Library initialization and termination :**

1. [apr\_status\_t][apr_status_t] [apr\_initialize][apr_initialize] (void)

// Setup any APR internal data structures. This MUST be the first function called for any APR library.

初始化APR内部数据结构， apr\_initialize()函数必须是第一个被调用的APR库函数

2. void [apr\_terminate][apr_terminate] (void)

// Tear down any APR internal data structures which aren't torn down automatically.

结束APR库的使用， 销毁apr 不能自动回收的数据结构。

**Memory Pool Functions：**

1. [apr\_status\_t][apr_status_t] apr\_pool\_create ([apr\_pool\_t][apr_pool_t] \*\*newpool, [apr\_pool\_t][apr_pool_t] \*parent)

//创建一个内存池

//Create a new pool.

//parent:The parent pool. If this is NULL, the new pool is a root pool.

创建一个内存池，这个内存池将一直存活，直到你调用 apr\_pool\_destroy() 函数以后被销毁

2. **void** \* apr\_palloc([apr\_pool\_t][apr_pool_t]\*p, apr\_size\_t size);

//在内存池上分配指定内存大小的内存块

//Allocate a block of memory from a pool

3. **void**apr\_pool\_destroy([apr\_pool\_t][apr_pool_t] \*p);

//销毁一个内存池

//Destroy the pool.

//**Remarks:** This will actually free the memory

4. void \* [apr\_pcalloc][apr_pcalloc] ([apr\_pool\_t][apr_pool_t 1] \*p, apr\_size\_t size)

在内存池上分配指定内存大小的内存块， 并将所有内存置为0

**Thread Pool routines**

1. [apr\_status\_t][apr_status_t 1] apr\_thread\_pool\_create( [apr\_thread\_pool\_t][apr_thread_pool_t] \*\* *me*, apr\_size\_t *init\_threads*, apr\_size\_t *max\_threads*, [apr\_pool\_t][apr_pool_t 1] \* *pool* )

创建线程地址池

2. [apr\_status\_t][apr_status_t 1] apr\_thread\_pool\_destroy([apr\_thread\_pool\_t][apr_thread_pool_t] \* *me*)

Destroy the thread pool and stop all the threads

**String routines :**

1. [apr\_status\_t][apr_status_t 1] [apr\_tokenize\_to\_argv][apr_tokenize_to_argv] (const char \*arg\_str, char \*\*\*argv\_out, [apr\_pool\_t][apr_pool_t 1] \*token\_context)

// Convert the arguments to a program from one string to an array of strings terminated by a NULL pointer

**File I/O Handling Functions:**

1. [apr\_status\_t][apr_status_t] [apr\_file\_open][apr_file_open] ([apr\_file\_t][apr_file_t] \*\*newf, const char \*fname, apr\_int32\_t flag, [apr\_fileperms\_t][apr_fileperms_t] perm, [apr\_pool\_t][apr_pool_t] \*pool)

// Open the specified file.  
2. [apr\_status\_t][apr_status_t] [apr\_file\_close][apr_file_close] ([apr\_file\_t][apr_file_t] \*file)

// Close the specified file.  
3. [apr\_status\_t][apr_status_t][apr\_file\_read][apr_file_read] ([apr\_file\_t][apr_file_t] \*thefile, void \*buf, apr\_size\_t \*nbytes)  
// Read data from the specified file.

4. [apr\_status\_t][apr_status_t] [apr\_file\_write][apr_file_write] ([apr\_file\_t][apr_file_t] \*thefile, const void \*buf, apr\_size\_t \*nbytes)

//Write data to the specified file.

5. [apr\_status\_t][apr_status_t] [apr\_file\_write\_full][apr_file_write_full] ([apr\_file\_t][apr_file_t] \*thefile, const void \*buf, apr\_size\_t nbytes, apr\_size\_t \*bytes\_written)

// Write data to the specified file, ensuring that all of the data is written before returning.

6. [apr\_status\_t][apr_status_t] [apr\_file\_info\_get][apr_file_info_get] ([apr\_finfo\_t][apr_finfo_t] \*finfo, apr\_int32\_t wanted, [apr\_file\_t][apr_file_t] \*thefile)

// get the specified file's stats.

7. [apr\_status\_t][apr_status_t] [apr\_file\_trunc][apr_file_trunc] ([apr\_file\_t][apr_file_t] \*fp, apr\_off\_t offset)

// Truncate the file's length to the specified offset

8. int [apr\_file\_printf][apr_file_printf] ([apr\_file\_t][apr_file_t] \*fptr, const char \*format,...)

//Write a string to a file using a printf format.

9. [apr\_status\_t][apr_status_t 1] [apr\_file\_rename][apr_file_rename] (const char \*from\_path, const char \*to\_path, [apr\_pool\_t][apr_pool_t 1] \*pool)

// Rename the specified file.

5. [apr\_status\_t][apr_status_t] [apr\_file\_eof][apr_file_eof] ([apr\_file\_t][apr_file_t] \*fptr)

// Are we at the end of the file

**Directory Manipulation Functions :**

1. [apr\_status\_t][apr_status_t] [apr\_dir\_open][apr_dir_open] ([apr\_dir\_t][apr_dir_t] \*\*new\_dir, const char \*dirname, [apr\_pool\_t][apr_pool_t] \*pool)

// Open the specified directory.

2. [apr\_status\_t][apr_status_t] [apr\_dir\_close][apr_dir_close] ([apr\_dir\_t][apr_dir_t] \*thedir)

// close the specified directory.

3. [apr\_status\_t][apr_status_t] [apr\_dir\_make\_recursive][apr_dir_make_recursive] (const char \*path, [apr\_fileperms\_t][apr_fileperms_t] perm, [apr\_pool\_t][apr_pool_t] \*pool)

// Creates a new directory on the file system, but behaves like 'mkdir -p'. Creates intermediate directories as required. No error will be reported if PATH already exists.

**Time Routines :**

1. [apr\_time\_t][apr_time_t] [apr\_time\_now][apr_time_now] (void)

// the current time

2. void [apr\_sleep][apr_sleep] ([apr\_interval\_time\_t][apr_interval_time_t] t)

// Sleep for the specified number of micro-seconds.

3. \#define [apr\_time\_from\_sec][apr_time_from_sec](sec) (([apr\_time\_t][apr_time_t])(sec) \* APR\_USEC\_PER\_SEC)

// return seconds as an apr\_time\_t

4. [apr\_status\_t][apr_status_t] [apr\_time\_exp\_lt][apr_time_exp_lt] ([apr\_time\_exp\_t][apr_time_exp_t] \*result, [apr\_time\_t][apr_time_t] input)

// convert a time to its human readable components in local timezone

**Threads and Process Functions**：

1. apr_status_t apr_procattr_create (apr_procattr_t **new_attr, apr_pool_t *cont)
       //创建并初始化新进程的属性, new_attr 是返回的结果， cont是要使用的内存池
       //Create and initialize a new procattr variable
    2.

typedef enum {
        APR_SHELLCMD,           /**< use the shell to invoke the program */
        APR_PROGRAM,            /**< invoke the program directly, no copied env */
        APR_PROGRAM_ENV,        /**< invoke the program, replicating our environment */
        APR_PROGRAM_PATH,       /**< find program on PATH, use our environment */
        APR_SHELLCMD_ENV        /**< use the shell to invoke the program,
                                 *   replicating our environment
                                 */
    } apr_cmdtype_e;

[apr\_status\_t][apr_status_t 1] apr\_procattr\_cmdtype\_set([apr\_procattr\_t][apr_procattr_t]\*attr, [apr\_cmdtype\_e][apr_cmdtype_e] cmd);

// Set what type of command the child process will call.

3. [apr\_status\_t][apr_status_t 1] apr\_procattr\_error\_check\_set（[apr\_procattr\_t][apr_procattr_t] \* *attr*, apr\_int32\_t *chk* ）

//Specify that [apr\_proc\_create()][apr_proc_create] should do whatever it can to report failures to the caller of [apr\_proc\_create()][apr_proc_create], rather than find out in the child.

4. [apr\_status\_t][apr_status_t 1] apr\_procattr\_user\_set( [apr\_procattr\_t][apr_procattr_t] \* *attr*, const char \* *username*, const char \* *password* )

// Set the username used for running process

5. [apr\_status\_t][apr_status_t 1] [apr\_procattr\_group\_set][apr_procattr_group_set]([apr\_procattr\_t][apr_procattr_t] \*attr, const char \*groupname)

//Set the group used for running process

6. [apr\_status\_t][apr_status_t 1] [apr\_procattr\_dir\_set][apr_procattr_dir_set]([apr\_procattr\_t][apr_procattr_t] \*attr, const char \*dir)

//Set which directory the child process should start executing in.

7. [apr\_status\_t][apr_status_t 1] [apr\_proc\_create][apr_proc_create]([apr\_proc\_t][apr_proc_t] \*new\_proc, const char \*progname, const char \*const \*args, const char \*const \*env, [apr\_procattr\_t][apr_procattr_t] \*attr, [apr\_pool\_t][apr_pool_t 1] \*pool)

//Create a new process and execute a new program within that process.

8. [apr\_status\_t][apr_status_t 1] [apr\_proc\_detach][apr_proc_detach] (int daemonize)

//Detach the process from the controlling terminal.

9. [apr\_status\_t][apr_status_t 1] [apr\_proc\_kill][apr_proc_kill] ([apr\_proc\_t][apr_proc_t] \*proc, int sig)

//Terminate a process.

10. [apr\_status\_t][apr_status_t 1] [apr\_proc\_wait][apr_proc_wait] ([apr\_proc\_t][apr_proc_t] \*proc, int \*exitcode, [apr\_exit\_why\_e][apr_exit_why_e] \*exitwhy, [apr\_wait\_how\_e][apr_wait_how_e] waithow)

//Wait for a child process to die

1. [apr\_status\_t][apr_status_t] [apr\_threadattr\_create][apr_threadattr_create] ([apr\_threadattr\_t][apr_threadattr_t] \*\*new\_attr, [apr\_pool\_t][apr_pool_t] \*cont)

// Create and initialize a new threadattr variable

2. [apr\_status\_t][apr_status_t] [apr\_threadattr\_stacksize\_set][apr_threadattr_stacksize_set] ([apr\_threadattr\_t][apr_threadattr_t] \*attr, apr\_size\_t stacksize)

// Set the stack size of newly created threads.

3. [apr\_status\_t][apr_status_t] [apr\_thread\_detach][apr_thread_detach] ([apr\_thread\_t][apr_thread_t] \*thd)

// detach a thread

4. [apr\_status\_t][apr_status_t] [apr\_thread\_join][apr_thread_join] ([apr\_status\_t][apr_status_t] \*retval, [apr\_thread\_t][apr_thread_t] \*thd)

// block until the desired thread stops executing.

pipe 接口：

详见：[http://dev.ariel-networks.com/apr/apr-tutorial/html/apr-tutorial-15.html][http_dev.ariel-networks.com_apr_apr-tutorial_html_apr-tutorial-15.html]

1. APR\_DECLARE(apr\_status\_t) apr\_procattr\_io\_set(apr\_procattr\_t \*attr, apr\_int32\_t in, apr\_int32\_t out, apr\_int32\_t err);

//设置进程属性的 标准intput/output/error 属性

**Functions for manipulating the environment :**

1. [apr\_status\_t][apr_status_t] 　[apr\_env\_get][apr_env_get] (char \*\*value, const char \*envvar, [apr\_pool\_t][apr_pool_t] \*pool)

//Get the value of an environment variable

**Network Routines :**

１.　[apr\_status\_t][apr_status_t] 　[apr\_socket\_create][apr_socket_create] ([apr\_socket\_t][apr_socket_t] \*\*new\_sock, int family, int type, int protocol, [apr\_pool\_t][apr_pool_t] \*cont)

// Create a socket.

2. [apr\_status\_t][apr_status_t] 　[apr\_socket\_connect][apr_socket_connect] ([apr\_socket\_t][apr_socket_t] \*sock, [apr\_sockaddr\_t][apr_sockaddr_t] \*sa)

Issue a connection request to a socket either on the same machine or a different one.

3. [apr\_status\_t][apr_status_t] 　[apr\_socket\_bind][apr_socket_bind] ([apr\_socket\_t][apr_socket_t] \*sock, [apr\_sockaddr\_t][apr_sockaddr_t] \*sa)

// Bind the socket to its associated port

4. [apr\_status\_t][apr_status_t] 　[apr\_socket\_listen][apr_socket_listen] ([apr\_socket\_t][apr_socket_t] \*sock, apr\_int32\_t backlog)

// Listen to a bound socket for connections.

5. [apr\_status\_t][apr_status_t] 　[apr\_socket\_accept][apr_socket_accept] ([apr\_socket\_t][apr_socket_t] \*\*new\_sock, [apr\_socket\_t][apr_socket_t] \*sock, [apr\_pool\_t][apr_pool_t] \*connection\_pool)

// Accept a new connection request

6. [apr\_status\_t][apr_status_t] 　[apr\_socket\_send][apr_socket_send] ([apr\_socket\_t][apr_socket_t] \*sock, const char \*buf, apr\_size\_t \*len)

//Send data over a network.

7. [apr\_status\_t][apr_status_t] 　[apr\_socket\_recv][apr_socket_recv] ([apr\_socket\_t][apr_socket_t] \*sock, char \*buf, apr\_size\_t \*len)

// Read data from a network.

8. [apr\_status\_t][apr_status_t] [apr\_socket\_opt\_set][apr_socket_opt_set] ([apr\_socket\_t][apr_socket_t] \*sock, apr\_int32\_t opt, apr\_int32\_t on)

//Setup socket options for the specified socket

9. [apr\_status\_t][apr_status_t] [apr\_socket\_timeout\_set][apr_socket_timeout_set] ([apr\_socket\_t][apr_socket_t] \*sock, [apr\_interval\_time\_t][apr_interval_time_t] t)

// Setup socket timeout for the specified socket

10. [apr\_status\_t][apr_status_t] [apr\_sockaddr\_info\_get][apr_sockaddr_info_get] ([apr\_sockaddr\_t][apr_sockaddr_t] \*\*sa, const char \*hostname, apr\_int32\_t family, [apr\_port\_t][apr_port_t] port, apr\_int32\_t flags, [apr\_pool\_t][apr_pool_t] \*p)

// Create [apr\_sockaddr\_t][apr_sockaddr_t] from hostname, address family, and port.

11. [apr\_status\_t][apr_status_t] [apr\_socket\_addr\_get][apr_socket_addr_get] ([apr\_sockaddr\_t][apr_sockaddr_t] \*\*sa, [apr\_interface\_e][apr_interface_e] which, [apr\_socket\_t][apr_socket_t] \*sock)

//Return an address associated with a socket; either the address to which the socket is bound locally or the the address of the peer to which the socket is connected.

12. [apr\_status\_t][apr_status_t] [apr\_sockaddr\_ip\_get][apr_sockaddr_ip_get] (char \*\*addr, [apr\_sockaddr\_t][apr_sockaddr_t] \*sockaddr)

// Return the IP address (in numeric address string format) in an APR socket address. APR will allocate storage for the IP address string from the pool of the [apr\_sockaddr\_t][apr_sockaddr_t].

13. [apr\_status\_t][apr_status_t] 　[apr\_socket\_close][apr_socket_close] ([apr\_socket\_t][apr_socket_t] \*thesocket)

// Close a socket.

14. [apr\_status\_t][apr_status_t] [apr\_socket\_shutdown][apr_socket_shutdown] ([apr\_socket\_t][apr_socket_t] \*thesocket, [apr\_shutdown\_how\_e][apr_shutdown_how_e] how)

// Shutdown either reading, writing, or both sides of a socket.

**Command Argument Parsing :**

1. [apr\_status\_t][apr_status_t] [apr\_getopt\_init][apr_getopt_init] ([apr\_getopt\_t][apr_getopt_t] \*\*os, [apr\_pool\_t][apr_pool_t] \*cont, int argc, const char \*const \*argv)

// Initialize the arguments for parsing by [apr\_getopt()][apr_getopt].

**Parameters:**

<table> 
 <tbody> 
  <tr> 
   <td>os</td> 
   <td>The options structure created for&nbsp;<a href="http://apr.apache.org/docs/apr/1.4/group__apr__getopt.html#ga289cdcf7eacc997eb91fea7c02d08934" rel="nofollow">apr_getopt()</a></td> 
  </tr> 
  <tr> 
   <td>cont</td> 
   <td>The pool to operate on</td> 
  </tr> 
  <tr> 
   <td><span style="color:#f33b45;">argc</span></td> 
   <td><span style="color:#f33b45;">The number of arguments to parse</span></td> 
  </tr> 
  <tr> 
   <td>argv</td> 
   <td>The array of arguments to parse</td> 
  </tr> 
 </tbody> 
</table>

2. [apr\_status\_t][apr_status_t] [apr\_getopt][apr_getopt] ([apr\_getopt\_t][apr_getopt_t] \*os, const char \*opts, char \*option\_ch, const char \*\*option\_arg)

// Parse the options initialized by [apr\_getopt\_init()][apr_getopt_init].

3. [apr\_status\_t][apr_status_t] [apr\_getopt\_long][apr_getopt_long] ([apr\_getopt\_t][apr_getopt_t] \*os, const [apr\_getopt\_option\_t][apr_getopt_option_t] \*opts, int \*option\_ch, const char \*\*option\_arg)

处理长参数， 以--开头， 短参数以- 开头的参数选项

**Error Codes :**

1. char \* [apr\_strerror][apr_strerror] ([apr\_status\_t][apr_status_t] statcode, char \*buf, apr\_size\_t bufsize)

// Return a human readable string describing the specified error.

**User and Group ID Services :**

1. [apr\_status\_t][apr_status_t] [apr\_uid\_get][apr_uid_get] ([apr\_uid\_t][apr_uid_t] \*userid, [apr\_gid\_t][apr_gid_t] \*groupid, const char \*username, [apr\_pool\_t][apr_pool_t] \*p)

// Get the userid (and groupid) for the specified username

**Atomic Operations**

1. [apr\_status\_t][apr_status_t 1] [apr\_atomic\_init][apr_atomic_init] ([apr\_pool\_t][apr_pool_t 1] \*p)

初始化原子操作

**Hash Tables**

1. typedef struct [apr\_hash\_t][apr_hash_t] [apr\_hash\_t][apr_hash_t]

apr hash table 的类型定义

2. [apr\_hash\_t][apr_hash_t] \* [apr\_hash\_make][apr_hash_make] ([apr\_pool\_t][apr_pool_t 1] \*pool)

创建一个hash table, 参数pool 是 给这个hash table 内配内存的地址池

对于apr\_hash\_make而言，它的主要的工作就是创建apr\_hash\_t结构，并对其中的成员进行初始化，其中哈希元素的个数被初始化为16个，同时使用默认的哈希算法apr\_hashfunc\_default，而apr\_hash\_make\_custom则使用自定义的哈希函数hash\_func。

3. [apr\_hash\_index\_t][apr_hash_index_t] \* [apr\_hash\_first][apr_hash_first] ([apr\_pool\_t][apr_pool_t 1] \*p, [apr\_hash\_t][apr_hash_t] \*ht)

开始迭代哈希表中的条目。

4. [apr\_hash\_index\_t][apr_hash_index_t] \* [apr\_hash\_next][apr_hash_next] ([apr\_hash\_index\_t][apr_hash_index_t] \*hi)

Continue iterating over the entries in a hash table.

5. void \* [apr\_hash\_this\_val][apr_hash_this_val] ([apr\_hash\_index\_t][apr_hash_index_t] \*hi)

Get the current entry's value from the iteration state.

6. void [apr\_hash\_set][apr_hash_set] ([apr\_hash\_t][apr_hash_t] \*ht, const void \*key, apr\_ssize\_t klen, const void \*val)

设置hash table 中key 对应的value,

如果val = null , 则删除该hash , 但是hash key 会一直存在，直到这个hash table 的地址池被回收

7. void \* [apr\_hash\_get][apr_hash_get] ([apr\_hash\_t][apr_hash_t] \*ht, const void \*key, apr\_ssize\_t klen)

在哈希表中查找与键关联的值

**Signal Handling**

1. [apr\_sigfunc\_t][apr_sigfunc_t] \* [apr\_signal][apr_signal] (int signo, [apr\_sigfunc\_t][apr_sigfunc_t] \*func)

Set the signal handler function for a given signal

**String routines**

1. char\* [apr\_pstrdup][apr_pstrdup] ([apr\_pool\_t][apr_pool_t 1] \*p, const char \*s)

将字符串复制到从池中分配的内存中

[http_apr.apache.org_docs_apr_2.0_group_apr_thread_proc.html_ga1426acc5bdd96385769e7b42bfa6ebbd]: http://apr.apache.org/docs/apr/2.0/group__apr__thread__proc.html#ga1426acc5bdd96385769e7b42bfa6ebbd
[apr_status_t]: http://apr.apache.org/docs/apr/1.4/group__apr__errno.html#gaf76ee4543247e9fb3f3546203e590a6c
[apr_initialize]: http://apr.apache.org/docs/apr/1.4/group__apr__library.html#ga4a91a6b9ff457ead13e670950127761a
[apr_terminate]: http://apr.apache.org/docs/apr/1.4/group__apr__library.html#ga8e96d45ee09fc7e7eb3646efef1424a3
[apr_pool_t]: http://apr.apache.org/docs/apr/1.4/group__apr__pools.html#gaf137f28edcf9a086cd6bc36c20d7cdfb
[apr_pcalloc]: http://apr.apache.org/docs/apr/2.0/group__apr__pools.html#gaf61c098ad258069d64cdf8c0a9369f9e
[apr_pool_t 1]: http://apr.apache.org/docs/apr/2.0/group__apr__pools.html#gaf137f28edcf9a086cd6bc36c20d7cdfb
[apr_status_t 1]: http://apr.apache.org/docs/apr/2.0/group__apr__errno.html#gaf76ee4543247e9fb3f3546203e590a6c
[apr_thread_pool_t]: http://apr.apache.org/docs/apr/2.0/group___a_p_r___util___t_p.html#gab31b68a03a0d5eec3e1879c253d3b620
[apr_tokenize_to_argv]: http://apr.apache.org/docs/apr/2.0/group__apr__strings.html#ga5213cee7e8ba799df9dc2e57f71cd4dd
[apr_file_open]: http://apr.apache.org/docs/apr/1.4/group__apr__file__io.html#gabda14cbf242fb4fe99055434213e5446
[apr_file_t]: http://apr.apache.org/docs/apr/1.4/group__apr__file__io.html#gaa46e4763ac375ea3c7a43ba6f6099e22
[apr_fileperms_t]: http://apr.apache.org/docs/apr/1.4/group__apr__file__info.html#ga3af19c4c47007169064a70f9351bc7d8
[apr_file_close]: http://apr.apache.org/docs/apr/1.4/group__apr__file__io.html#ga5607bce1c4c798ceb6c8475a998a81a1
[apr_file_read]: http://apr.apache.org/docs/apr/1.4/group__apr__file__io.html#gadd067ee0050dff0c03a9420c9d424466
[apr_file_write]: http://apr.apache.org/docs/apr/1.4/group__apr__file__io.html#ga2e4baa94102c363fdca3c850375d3584
[apr_file_write_full]: http://apr.apache.org/docs/apr/1.4/group__apr__file__io.html#ga560d5c062d65e64c07d906d1207337d4
[apr_file_info_get]: http://apr.apache.org/docs/apr/1.4/group__apr__file__io.html#ga39be7fe05d0dda4a28f4358b61a44ac8
[apr_finfo_t]: http://apr.apache.org/docs/apr/1.4/structapr__finfo__t.html
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