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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)

Check Out this Related 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)
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