ares_library_cleanup(3) [debian man page]

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.

       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) it shall not make any further call to any c-ares function.

       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.

       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)

ARES_SET_SERVERS(3)					     Library Functions Manual					       ARES_SET_SERVERS(3)

NAME

       ares_set_servers - Initialize an ares_channel name servers configuration

SYNOPSIS

       #include <ares.h>

       int ares_set_servers(ares_channel channel, struct ares_addr_node *servers)

DESCRIPTION

       The  ares_set_servers(3) function initializes name servers configuration for the channel data identified by channel, from a servers pointer
       to a linked list of ares_addr_node structs holding name servers address data.

       The name server linked list pointer argument may be the result of a previous call to ares_get_servers(3) or a linked list of ares_addr_node
       structs setup by other means.

       This function replaces any potentially previously configured name servers with the ones given in the linked list. So, in order to configure
       a channel with more than one name server all the desired ones must be specified in a single list.

       ares_set_servers(3) does not take ownership of the linked list argument.  The caller is responsible for freeing the  linked  list  when	no
       longer needed.

       This  function  is  capable  of	handling  IPv4	and IPv6 name server addresses simultaneously, rendering ares_init_options(3) with optmask
       ARES_OPT_SERVERS functionally obsolete except for IPv4-only name server usage.

RETURN VALUES

       ares_set_servers(3) may return any of the following values:

       ARES_SUCCESS   The name servers configuration was successfuly initialized.

       ARES_ENOMEM    The process's available memory was exhausted.

       ARES_ENODATA   The channel data identified by channel was invalid.

       ARES_ENOTINITIALIZED
		      c-ares library initialization not yet performed.

SEE ALSO

       ares_set_servers_csv(3), ares_get_servers(3), ares_init_options(3), ares_dup(3)

AVAILABILITY

       ares_set_servers(3) was added in c-ares 1.7.1

AUTHOR

       Implementation of this function and associated library internals are based on code, comments and feedback provided in November and December
       of 2008 by Daniel Stenberg, Gregor Jasny, Phil Blundell and Yang Tse, December 2009 by Cedric Bail, February 2010 by Jakub Hrozek. On March
       2010 Yang Tse shuffled all the bits and this function popped out.
       Copyright 1998 by the Massachusetts Institute of Technology.
       Copyright (C) 2008-2010 by Daniel Stenberg

								   5 March 2010 					       ARES_SET_SERVERS(3)