ares_cancel(3) [debian man page]

ARES_CANCEL(3)						     Library Functions Manual						    ARES_CANCEL(3)

NAME

       ares_cancel - Cancel a resolve

SYNOPSIS

       #include <ares.h>

       void ares_cancel(ares_channel channel)

DESCRIPTION

       The  ares_cancel function cancels all lookups/requests made on the the name service channel identified by channel.  ares_cancel invokes the
       callbacks for each pending query on the channel, passing a status of ARES_ECANCELLED.  These calls give the callbacks a chance to clean	up
       any state which might have been stored in their arguments.

SEE ALSO

       ares_init(3) ares_destroy(3)

NOTES

       This function was added in c-ares 1.2.0

       c-ares 1.6.0 and earlier pass a status of ARES_ETIMEOUT instead of ARES_ECANCELLED.

AUTHOR

       Dirk Manske

								   31 March 2004						    ARES_CANCEL(3)

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)