ares_free_data(3) [debian man page]
ARES_FREE_DATA(3) Library Functions Manual ARES_FREE_DATA(3) NAME
ares_free_data - Free data allocated by several c-ares functions SYNOPSIS
#include <ares.h> void ares_free_data(void *dataptr) cc file.c -lcares DESCRIPTION
The ares_free_data(3) function frees one or more data structures allocated and returned by several c-ares functions. Specifically the data returned by the following list of functions must be deallocated using this function. ares_get_servers(3) When used to free the data returned by ares_get_servers(3) this will free the whole linked list of ares_addr_node structures returned by ares_get_servers(3). ares_parse_srv_reply(3) When used to free the data returned by ares_parse_srv_reply(3) this will free the whole linked list of ares_srv_reply structures returned by ares_parse_srv_reply(3), along with any additional storage associated with those structures. ares_parse_mx_reply(3) When used to free the data returned by ares_parse_mx_reply(3) this will free the whole linked list of ares_mx_reply structures returned by ares_parse_mx_reply(3), along with any additional storage associated with those structures. ares_parse_txt_reply(3) When used to free the data returned by ares_parse_txt_reply(3) this will free the whole linked list of ares_txt_reply structures returned by ares_parse_txt_reply(3), along with any additional storage associated with those structures. ares_parse_soa_reply(3) When used to free the data returned by ares_parse_soa_reply(3) this will free the ares_soa_reply structure, along with any additional storage associated with those structure. RETURN VALUE
The ares_free_data() function does not return a value. AVAILABILITY
This function was first introduced in c-ares version 1.7.0. SEE ALSO
ares_get_servers(3), ares_parse_srv_reply(3), ares_parse_mx_reply(3), ares_parse_txt_reply(3), ares_parse_soa_reply(3) AUTHOR
Yang Tse Copyright 1998 by the Massachusetts Institute of Technology. Copyright (C) 2004-2010 by Daniel Stenberg. 5 March 2010 ARES_FREE_DATA(3)
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ARES_LIBRARY_CLEANUP(3) Library Functions Manual ARES_LIBRARY_CLEANUP(3) NAME
ares_library_cleanup - c-ares library deinitialization SYNOPSIS
#include <ares.h> void ares_library_cleanup(void) cc file.c -lcares DESCRIPTION
The ares_library_cleanup function uninitializes the c-ares library, freeing all resources previously acquired by ares_library_init(3) when the library was initialized, provided there was only one single previous call to ares_library_init(3). If there was more than one previous call to ares_library_init(3), this function uninitializes the c-ares library only if it is the call matching the call to ares_library_init(3) which initialized the library (usually the very first call to ares_library_init(3)). Other calls to ares_library_cleanup(3) have no effect other than decrementing an internal counter. This function must be called when the program using c-ares will no longer need any c-ares function. Once the program has called ares_library_cleanup(3) sufficiently often such that the library is uninitialised, it shall not make any further call to any c-ares func- tion. This function does not cancel any pending c-ares lookups or requests previously done. Program must use ares_cancel(3) for this purpose. This function is not thread safe. You have to call it once the program is about to terminate, but this call must be done once the program has terminated every single thread that it could have initiated. This is required to avoid potential race conditions in library deinitial- ization, and also due to the fact that ares_library_cleanup(3) might call functions from other libraries that are thread unsafe, and could conflict with any other thread that is already using these other libraries. Win32/64 application DLLs shall not call ares_library_cleanup(3) from the DllMain function. Doing so will produce deadlocks and other prob- lems. AVAILABILITY
This function was first introduced in c-ares version 1.7.0 along with the definition of preprocessor symbol CARES_HAVE_ARES_LIBRARY_CLEANUP as an indication of the availability of this function. Reference counting in ares_library_init() and ares_library_cleanup(), which requires calls to the former function to match calls to the latter, is present since c-ares version 1.10.0. Earlier versions would deinitialize the library on the first call to ares_library_cleanup(). Since the introduction of this function, it is absolutely mandatory to call it for any Win32/64 program using c-ares. Non-Win32/64 systems can still use c-ares version 1.7.0 without calling ares_library_cleanup(3) due to the fact that currently it is nearly a do-nothing function on non-Win32/64 platforms. SEE ALSO
ares_library_init(3), ares_cancel(3) AUTHOR
Yang Tse Copyright 1998 by the Massachusetts Institute of Technology. Copyright (C) 2004-2009 by Daniel Stenberg. 19 May 2009 ARES_LIBRARY_CLEANUP(3)