ARES_CANCEL(3) Library Functions Manual ARES_CANCEL(3)NAME
ares_cancel - Cancel a resolve
void ares_cancel(ares_channel channel)
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.
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
cc file.c -lcares
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-
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
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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